// // fiv-io.c: image operations // // Copyright (c) 2021 - 2022, PÅ™emysl Eric Janouch // // Permission to use, copy, modify, and/or distribute this software for any // purpose with or without fee is hereby granted. // // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. // #include "config.h" #include #include #include #include #include #include #include #include #include #ifdef HAVE_JPEG_QS #include #include #include #include #endif // HAVE_JPEG_QS // Colour management must be handled before RGB conversions. #ifdef HAVE_LCMS2 #include #endif // HAVE_LCMS2 #ifdef HAVE_LIBRAW #include #endif // HAVE_LIBRAW #ifdef HAVE_RESVG #include #endif // HAVE_RESVG #ifdef HAVE_LIBRSVG #include #endif // HAVE_LIBRSVG #ifdef HAVE_XCURSOR #include #endif // HAVE_XCURSOR #ifdef HAVE_LIBHEIF #include #endif // HAVE_LIBHEIF #ifdef HAVE_LIBTIFF #include #include #endif // HAVE_LIBTIFF #ifdef HAVE_GDKPIXBUF #include #include #endif // HAVE_GDKPIXBUF #define WUFFS_IMPLEMENTATION #define WUFFS_CONFIG__MODULES #define WUFFS_CONFIG__MODULE__ADLER32 #define WUFFS_CONFIG__MODULE__BASE #define WUFFS_CONFIG__MODULE__BMP #define WUFFS_CONFIG__MODULE__CRC32 #define WUFFS_CONFIG__MODULE__DEFLATE #define WUFFS_CONFIG__MODULE__GIF #define WUFFS_CONFIG__MODULE__LZW #define WUFFS_CONFIG__MODULE__PNG #define WUFFS_CONFIG__MODULE__TGA #define WUFFS_CONFIG__MODULE__ZLIB #include "wuffs-mirror-release-c/release/c/wuffs-v0.3.c" #include "fiv-io.h" #if CAIRO_VERSION >= 11702 && X11_ACTUALLY_SUPPORTS_RGBA128F_OR_WE_USE_OPENGL #define FIV_CAIRO_RGBA128F #endif // A subset of shared-mime-info that produces an appropriate list of // file extensions. Chiefly motivated by the suckiness of raw photo formats: // someone else will maintain the list of file extensions for us. const char *fiv_io_supported_media_types[] = { "image/bmp", "image/gif", "image/png", "image/x-tga", "image/jpeg", "image/webp", #ifdef HAVE_LIBRAW "image/x-dcraw", #endif // HAVE_LIBRAW #if defined HAVE_RESVG || defined HAVE_LIBRSVG "image/svg+xml", #endif // HAVE_RESVG || HAVE_LIBRSVG #ifdef HAVE_XCURSOR "image/x-xcursor", #endif // HAVE_XCURSOR #ifdef HAVE_LIBHEIF "image/heic", "image/heif", "image/avif", #endif // HAVE_LIBHEIF #ifdef HAVE_LIBTIFF "image/tiff", #endif // HAVE_LIBTIFF NULL }; gchar ** fiv_io_all_supported_media_types(void) { GPtrArray *types = g_ptr_array_new(); for (const char **p = fiv_io_supported_media_types; *p; p++) g_ptr_array_add(types, g_strdup(*p)); #ifdef HAVE_GDKPIXBUF GSList *formats = gdk_pixbuf_get_formats(); for (GSList *iter = formats; iter; iter = iter->next) { gchar **subtypes = gdk_pixbuf_format_get_mime_types(iter->data); for (gchar **p = subtypes; *p; p++) g_ptr_array_add(types, *p); g_free(subtypes); } g_slist_free(formats); #endif // HAVE_GDKPIXBUF g_ptr_array_add(types, NULL); return (char **) g_ptr_array_free(types, FALSE); } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #define FIV_IO_ERROR fiv_io_error_quark() G_DEFINE_QUARK(fiv-io-error-quark, fiv_io_error) enum FivIoError { FIV_IO_ERROR_OPEN }; static void set_error(GError **error, const char *message) { g_set_error_literal(error, FIV_IO_ERROR, FIV_IO_ERROR_OPEN, message); } static void add_warning(const FivIoOpenContext *ctx, const char *format, ...) G_GNUC_PRINTF(2, 3); static void add_warning(const FivIoOpenContext *ctx, const char *format, ...) { va_list ap; va_start(ap, format); if (ctx->warnings) g_ptr_array_add(ctx->warnings, g_strdup_vprintf(format, ap)); else g_logv(G_LOG_DOMAIN, G_LOG_LEVEL_WARNING, format, ap); va_end(ap); } static bool try_append_page(cairo_surface_t *surface, cairo_surface_t **result, cairo_surface_t **result_tail) { if (!surface) return false; if (*result) { cairo_surface_set_user_data(*result_tail, &fiv_io_key_page_next, surface, (cairo_destroy_func_t) cairo_surface_destroy); cairo_surface_set_user_data( surface, &fiv_io_key_page_previous, *result_tail, NULL); *result_tail = surface; } else { *result = *result_tail = surface; } return true; } // --- Colour management ------------------------------------------------------- FivIoProfile fiv_io_profile_new(const void *data, size_t len) { #ifdef HAVE_LCMS2 return cmsOpenProfileFromMem(data, len); #else (void) data; (void) len; return NULL; #endif } FivIoProfile fiv_io_profile_new_sRGB(void) { #ifdef HAVE_LCMS2 return cmsCreate_sRGBProfile(); #else return NULL; #endif } FivIoProfile fiv_io_profile_new_sRGB_gamma(double gamma) { #ifdef HAVE_LCMS2 // TODO(p): Make sure to use the library in a thread-safe manner. cmsContext context = NULL; static const cmsCIExyY D65 = {0.3127, 0.3290, 1.0}; static const cmsCIExyYTRIPLE primaries = { {0.6400, 0.3300, 1.0}, {0.3000, 0.6000, 1.0}, {0.1500, 0.0600, 1.0}}; cmsToneCurve *curve = cmsBuildGamma(context, gamma); if (!curve) return NULL; cmsHPROFILE profile = cmsCreateRGBProfileTHR( context, &D65, &primaries, (cmsToneCurve *[3]){curve, curve, curve}); cmsFreeToneCurve(curve); return profile; #else (void) gamma; return NULL; #endif } static FivIoProfile fiv_io_profile_new_from_bytes(GBytes *bytes) { gsize len = 0; gconstpointer p = g_bytes_get_data(bytes, &len); return fiv_io_profile_new(p, len); } static GBytes * fiv_io_profile_to_bytes(FivIoProfile profile) { #ifdef HAVE_LCMS2 cmsUInt32Number len = 0; (void) cmsSaveProfileToMem(profile, NULL, &len); gchar *data = g_malloc0(len); if (!cmsSaveProfileToMem(profile, data, &len)) { g_free(data); return NULL; } return g_bytes_new_take(data, len); #else (void) profile; return NULL; #endif } void fiv_io_profile_free(FivIoProfile self) { #ifdef HAVE_LCMS2 cmsCloseProfile(self); #else (void) self; #endif } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // TODO(p): In general, try to use CAIRO_FORMAT_RGB30 or CAIRO_FORMAT_RGBA128F. #define FIV_IO_LCMS2_ARGB32 \ (G_BYTE_ORDER == G_LITTLE_ENDIAN ? TYPE_BGRA_8 : TYPE_ARGB_8) #define FIV_IO_LCMS2_4X16LE \ (G_BYTE_ORDER == G_LITTLE_ENDIAN ? TYPE_BGRA_16 : TYPE_BGRA_16_SE) // CAIRO_STRIDE_ALIGNMENT is 4 bytes, so there will be no padding with // ARGB/BGRA/XRGB/BGRX. static void trivial_cmyk_to_host_byte_order_argb(unsigned char *p, int len) { // This CMYK handling has been seen in gdk-pixbuf/JPEG, GIMP/JPEG, skcms. // It will typically produce horribly oversaturated results. // Assume that all YCCK/CMYK JPEG files use inverted CMYK, as Photoshop // does, see https://bugzilla.gnome.org/show_bug.cgi?id=618096 while (len--) { int c = p[0], m = p[1], y = p[2], k = p[3]; #if G_BYTE_ORDER == G_LITTLE_ENDIAN p[0] = k * y / 255; p[1] = k * m / 255; p[2] = k * c / 255; p[3] = 255; #else p[3] = k * y / 255; p[2] = k * m / 255; p[1] = k * c / 255; p[0] = 255; #endif p += 4; } } static void fiv_io_profile_cmyk( cairo_surface_t *surface, FivIoProfile source, FivIoProfile target) { unsigned char *data = cairo_image_surface_get_data(surface); int w = cairo_image_surface_get_width(surface); int h = cairo_image_surface_get_height(surface); #ifndef HAVE_LCMS2 (void) source; (void) target; #else cmsHTRANSFORM transform = NULL; if (source && target) { transform = cmsCreateTransform(source, TYPE_CMYK_8_REV, target, FIV_IO_LCMS2_ARGB32, INTENT_PERCEPTUAL, 0); } if (transform) { cmsDoTransform(transform, data, data, w * h); cmsDeleteTransform(transform); return; } #endif trivial_cmyk_to_host_byte_order_argb(data, w * h); } static void fiv_io_profile_xrgb32_direct(unsigned char *data, int w, int h, FivIoProfile source, FivIoProfile target) { #ifndef HAVE_LCMS2 (void) data; (void) w; (void) h; (void) source; (void) target; #else // TODO(p): We should make this optional. cmsHPROFILE src_fallback = NULL; if (target && !source) source = src_fallback = cmsCreate_sRGBProfile(); cmsHTRANSFORM transform = NULL; if (source && target) { transform = cmsCreateTransform(source, FIV_IO_LCMS2_ARGB32, target, FIV_IO_LCMS2_ARGB32, INTENT_PERCEPTUAL, 0); } if (transform) { cmsDoTransform(transform, data, data, w * h); cmsDeleteTransform(transform); } if (src_fallback) cmsCloseProfile(src_fallback); #endif } static void fiv_io_profile_xrgb32( cairo_surface_t *surface, FivIoProfile source, FivIoProfile target) { unsigned char *data = cairo_image_surface_get_data(surface); int w = cairo_image_surface_get_width(surface); int h = cairo_image_surface_get_height(surface); fiv_io_profile_xrgb32_direct(data, w, h, source, target); } static void fiv_io_profile_4x16le_direct( unsigned char *data, int w, int h, FivIoProfile source, FivIoProfile target) { #ifndef HAVE_LCMS2 (void) data; (void) w; (void) h; (void) source; (void) target; #else // TODO(p): We should make this optional. cmsHPROFILE src_fallback = NULL; if (target && !source) source = src_fallback = cmsCreate_sRGBProfile(); cmsHTRANSFORM transform = NULL; if (source && target) { transform = cmsCreateTransform(source, FIV_IO_LCMS2_4X16LE, target, FIV_IO_LCMS2_4X16LE, INTENT_PERCEPTUAL, 0); } if (transform) { cmsDoTransform(transform, data, data, w * h); cmsDeleteTransform(transform); } if (src_fallback) cmsCloseProfile(src_fallback); #endif } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void fiv_io_profile_xrgb32_page(cairo_surface_t *page, FivIoProfile target) { GBytes *bytes = NULL; FivIoProfile source = NULL; if ((bytes = cairo_surface_get_user_data(page, &fiv_io_key_icc))) source = fiv_io_profile_new_from_bytes(bytes); // TODO(p): All animations need to be composited in a linear colour space. for (cairo_surface_t *frame = page; frame != NULL; frame = cairo_surface_get_user_data(frame, &fiv_io_key_frame_next)) fiv_io_profile_xrgb32(frame, source, target); if (source) fiv_io_profile_free(source); } // TODO(p): Offer better integration, upgrade the bit depth if appropriate. static cairo_surface_t * fiv_io_profile_finalize(cairo_surface_t *image, FivIoProfile target) { if (!image || !target) return image; for (cairo_surface_t *page = image; page != NULL; page = cairo_surface_get_user_data(page, &fiv_io_key_page_next)) { // TODO(p): 1. un/premultiply ARGB, 2. do colour management // early enough, so that no avoidable increase of quantization error // occurs beforehands, and also for correct alpha compositing. // FIXME: This assumes that if the first frame is opaque, they all are. if (cairo_image_surface_get_format(page) == CAIRO_FORMAT_RGB24) fiv_io_profile_xrgb32_page(page, target); } return image; } static void fiv_io_premultiply_argb32(cairo_surface_t *surface) { int w = cairo_image_surface_get_width(surface); int h = cairo_image_surface_get_height(surface); unsigned char *data = cairo_image_surface_get_data(surface); int stride = cairo_image_surface_get_stride(surface); if (cairo_image_surface_get_format(surface) != CAIRO_FORMAT_ARGB32) return; for (int y = 0; y < h; y++) { uint32_t *dstp = (uint32_t *) (data + stride * y); for (int x = 0; x < w; x++) { uint32_t argb = dstp[x], a = argb >> 24; dstp[x] = a << 24 | PREMULTIPLY8(a, 0xFF & (argb >> 16)) << 16 | PREMULTIPLY8(a, 0xFF & (argb >> 8)) << 8 | PREMULTIPLY8(a, 0xFF & argb); } } } static void fiv_io_premultiply_argb32_page(cairo_surface_t *page) { for (cairo_surface_t *frame = page; frame != NULL; frame = cairo_surface_get_user_data(frame, &fiv_io_key_frame_next)) fiv_io_premultiply_argb32(frame); } // --- Wuffs ------------------------------------------------------------------- static bool pull_passthrough(const wuffs_base__more_information *minfo, wuffs_base__io_buffer *src, wuffs_base__io_buffer *dst, GError **error) { wuffs_base__range_ie_u64 r = wuffs_base__more_information__metadata_raw_passthrough__range(minfo); if (wuffs_base__range_ie_u64__is_empty(&r)) return true; // This should currently be zero, because we read files all at once. uint64_t pos = src->meta.pos; if (pos > r.min_incl || wuffs_base__u64__sat_sub(r.max_excl, pos) > src->meta.wi) { set_error(error, "metadata is outside the read buffer"); return false; } // Mimic WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_TRANSFORM. *dst = wuffs_base__make_io_buffer(src->data, wuffs_base__make_io_buffer_meta( wuffs_base__u64__sat_sub(r.max_excl, pos), wuffs_base__u64__sat_sub(r.min_incl, pos), pos, TRUE)); // Seeking to the end of it seems to be a requirement in decode_gif.wuffs. // Just not in case the block was empty. :^) src->meta.ri = dst->meta.wi; return true; } static GBytes * pull_metadata(wuffs_base__image_decoder *dec, wuffs_base__io_buffer *src, wuffs_base__more_information *minfo, GError **error) { uint8_t buf[8192] = {}; GByteArray *array = g_byte_array_new(); while (true) { *minfo = wuffs_base__empty_more_information(); wuffs_base__io_buffer dst = wuffs_base__ptr_u8__writer(buf, sizeof buf); wuffs_base__status status = wuffs_base__image_decoder__tell_me_more(dec, &dst, minfo, src); switch (minfo->flavor) { case 0: // Most likely as a result of an error, we'll handle that below. case WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_TRANSFORM: // Wuffs is reading it into the buffer. case WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_PARSED: // Use Wuffs accessor functions in the caller. break; default: set_error(error, "Wuffs metadata API incompatibility"); goto fail; case WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_PASSTHROUGH: // The insane case: error checking really should come first, // and it can say "even more information". See decode_gif.wuffs. if (!pull_passthrough(minfo, src, &dst, error)) goto fail; } g_byte_array_append(array, wuffs_base__io_buffer__reader_pointer(&dst), wuffs_base__io_buffer__reader_length(&dst)); if (wuffs_base__status__is_ok(&status)) return g_byte_array_free_to_bytes(array); if (status.repr != wuffs_base__suspension__even_more_information && status.repr != wuffs_base__suspension__short_write) { set_error(error, wuffs_base__status__message(&status)); goto fail; } } fail: g_byte_array_unref(array); return NULL; } struct load_wuffs_frame_context { wuffs_base__image_decoder *dec; ///< Wuffs decoder abstraction wuffs_base__io_buffer *src; ///< Wuffs source buffer wuffs_base__image_config cfg; ///< Wuffs image configuration wuffs_base__slice_u8 workbuf; ///< Work buffer for Wuffs wuffs_base__frame_config last_fc; ///< Previous frame configuration uint32_t width; ///< Copied from cfg.pixcfg uint32_t height; ///< Copied from cfg.pixcfg cairo_format_t cairo_format; ///< Target format for surfaces bool pack_16_10; ///< Custom copying swizzle for RGB30 bool expand_16_float; ///< Custom copying swizzle for RGBA128F GBytes *meta_exif; ///< Reference-counted Exif GBytes *meta_iccp; ///< Reference-counted ICC profile GBytes *meta_xmp; ///< Reference-counted XMP FivIoProfile target; ///< Target device profile, if any FivIoProfile source; ///< Source colour profile, if any cairo_surface_t *result; ///< The resulting surface (referenced) cairo_surface_t *result_tail; ///< The final animation frame }; static bool load_wuffs_frame(struct load_wuffs_frame_context *ctx, GError **error) { wuffs_base__frame_config fc = {}; wuffs_base__status status = wuffs_base__image_decoder__decode_frame_config(ctx->dec, &fc, ctx->src); if (status.repr == wuffs_base__note__end_of_data && ctx->result) return false; if (!wuffs_base__status__is_ok(&status)) { set_error(error, wuffs_base__status__message(&status)); return false; } // TODO(p): Maybe pre-clear with // wuffs_base__frame_config__background_color(&fc). // Wuffs' test/data/animated-red-blue.gif, e.g., needs this handling. cairo_format_t decode_format = ctx->cairo_format; if (wuffs_base__frame_config__index(&fc) > 0 && wuffs_base__pixel_config__pixel_format(&ctx->cfg.pixcfg).repr == WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL) decode_format = CAIRO_FORMAT_ARGB32; unsigned char *targetbuf = NULL; cairo_surface_t *surface = cairo_image_surface_create(decode_format, ctx->width, ctx->height); cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { set_error(error, cairo_status_to_string(surface_status)); goto fail; } // CAIRO_STRIDE_ALIGNMENT is 4 bytes, so there will be no padding with // ARGB/BGR/XRGB/BGRX. This function does not support a stride different // from the width, maybe Wuffs internals do not either. unsigned char *surface_data = cairo_image_surface_get_data(surface); int surface_stride = cairo_image_surface_get_stride(surface); wuffs_base__pixel_buffer pb = {0}; if (ctx->expand_16_float || ctx->pack_16_10) { uint32_t targetbuf_size = ctx->height * ctx->width * 8; targetbuf = g_malloc(targetbuf_size); status = wuffs_base__pixel_buffer__set_from_slice(&pb, &ctx->cfg.pixcfg, wuffs_base__make_slice_u8(targetbuf, targetbuf_size)); } else { status = wuffs_base__pixel_buffer__set_from_slice(&pb, &ctx->cfg.pixcfg, wuffs_base__make_slice_u8(surface_data, surface_stride * cairo_image_surface_get_height(surface))); } if (!wuffs_base__status__is_ok(&status)) { set_error(error, wuffs_base__status__message(&status)); goto fail; } // Starting to modify pixel data directly. Probably an unnecessary call. cairo_surface_flush(surface); status = wuffs_base__image_decoder__decode_frame(ctx->dec, &pb, ctx->src, WUFFS_BASE__PIXEL_BLEND__SRC, ctx->workbuf, NULL); if (!wuffs_base__status__is_ok(&status)) { set_error(error, wuffs_base__status__message(&status)); // The PNG decoder, at minimum, will flush any pixel data, so use them. if (status.repr != wuffs_base__suspension__short_read) goto fail; } if (ctx->target) { if (ctx->expand_16_float || ctx->pack_16_10) { fiv_io_profile_4x16le_direct( targetbuf, ctx->width, ctx->height, ctx->source, ctx->target); // The first one premultiplies below, the second doesn't need to. } else { fiv_io_profile_xrgb32_direct(surface_data, ctx->width, ctx->height, ctx->source, ctx->target); fiv_io_premultiply_argb32(surface); } } if (ctx->expand_16_float) { g_debug("Wuffs to Cairo RGBA128F"); uint16_t *in = (uint16_t *) targetbuf; float *out = (float *) surface_data; for (uint32_t y = 0; y < ctx->height; y++) { for (uint32_t x = 0; x < ctx->width; x++) { float b = *in++ / 65535., g = *in++ / 65535., r = *in++ / 65535., a = *in++ / 65535.; *out++ = r * a; *out++ = g * a; *out++ = b * a; *out++ = a; } } } else if (ctx->pack_16_10) { g_debug("Wuffs to Cairo RGB30"); uint16_t *in = (uint16_t *) targetbuf; uint32_t *out = (uint32_t *) surface_data; for (uint32_t y = 0; y < ctx->height; y++) { for (uint32_t x = 0; x < ctx->width; x++) { uint32_t b = *in++, g = *in++, r = *in++, X = *in++; *out++ = (X >> 14) << 30 | (r >> 6) << 20 | (g >> 6) << 10 | (b >> 6); } } } // Pixel data has been written, need to let Cairo know. cairo_surface_mark_dirty(surface); // Single-frame images get a fast path, animations are are handled slowly: if (wuffs_base__frame_config__index(&fc) > 0) { // Copy the previous frame to a new surface. cairo_surface_t *canvas = cairo_image_surface_create( ctx->cairo_format, ctx->width, ctx->height); int stride = cairo_image_surface_get_stride(canvas); int height = cairo_image_surface_get_height(canvas); memcpy(cairo_image_surface_get_data(canvas), cairo_image_surface_get_data(ctx->result_tail), stride * height); cairo_surface_mark_dirty(canvas); // Apply that frame's disposal method. // XXX: We do not expect opaque pictures to receive holes this way. wuffs_base__rect_ie_u32 bounds = wuffs_base__frame_config__bounds(&ctx->last_fc); // TODO(p): This field needs to be colour-managed. wuffs_base__color_u32_argb_premul bg = wuffs_base__frame_config__background_color(&ctx->last_fc); double a = (bg >> 24) / 255., r = 0, g = 0, b = 0; if (a) { r = (uint8_t) (bg >> 16) / 255. / a; g = (uint8_t) (bg >> 8) / 255. / a; b = (uint8_t) (bg) / 255. / a; } cairo_t *cr = cairo_create(canvas); switch (wuffs_base__frame_config__disposal(&ctx->last_fc)) { case WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_BACKGROUND: cairo_rectangle(cr, bounds.min_incl_x, bounds.min_incl_y, bounds.max_excl_x - bounds.min_incl_x, bounds.max_excl_y - bounds.min_incl_y); cairo_set_source_rgba(cr, r, g, b, a); cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE); cairo_fill(cr); break; case WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_PREVIOUS: // TODO(p): Implement, it seems tricky. // Might need another surface to keep track of the state. break; case WUFFS_BASE__ANIMATION_DISPOSAL__NONE: break; } // Paint the current frame over that, within its bounds. bounds = wuffs_base__frame_config__bounds(&fc); cairo_rectangle(cr, bounds.min_incl_x, bounds.min_incl_y, bounds.max_excl_x - bounds.min_incl_x, bounds.max_excl_y - bounds.min_incl_y); cairo_clip(cr); cairo_set_operator(cr, wuffs_base__frame_config__overwrite_instead_of_blend(&fc) ? CAIRO_OPERATOR_SOURCE : CAIRO_OPERATOR_OVER); cairo_set_source_surface(cr, surface, 0, 0); cairo_paint(cr); cairo_destroy(cr); cairo_surface_destroy(surface); surface = canvas; } if (ctx->meta_exif) cairo_surface_set_user_data(surface, &fiv_io_key_exif, g_bytes_ref(ctx->meta_exif), (cairo_destroy_func_t) g_bytes_unref); if (ctx->meta_iccp) cairo_surface_set_user_data(surface, &fiv_io_key_icc, g_bytes_ref(ctx->meta_iccp), (cairo_destroy_func_t) g_bytes_unref); if (ctx->meta_xmp) cairo_surface_set_user_data(surface, &fiv_io_key_xmp, g_bytes_ref(ctx->meta_xmp), (cairo_destroy_func_t) g_bytes_unref); cairo_surface_set_user_data(surface, &fiv_io_key_loops, (void *) (uintptr_t) wuffs_base__image_decoder__num_animation_loops( ctx->dec), NULL); cairo_surface_set_user_data(surface, &fiv_io_key_frame_duration, (void *) (intptr_t) (wuffs_base__frame_config__duration(&fc) / WUFFS_BASE__FLICKS_PER_MILLISECOND), NULL); cairo_surface_set_user_data( surface, &fiv_io_key_frame_previous, ctx->result_tail, NULL); if (ctx->result_tail) cairo_surface_set_user_data(ctx->result_tail, &fiv_io_key_frame_next, surface, (cairo_destroy_func_t) cairo_surface_destroy); else ctx->result = surface; ctx->result_tail = surface; ctx->last_fc = fc; g_free(targetbuf); return wuffs_base__status__is_ok(&status); fail: cairo_surface_destroy(surface); g_clear_pointer(&ctx->result, cairo_surface_destroy); ctx->result_tail = NULL; g_free(targetbuf); return false; } // https://github.com/google/wuffs/blob/main/example/gifplayer/gifplayer.c // is pure C, and a good reference. I can't use the auxiliary libraries, // since they depend on C++, which is undesirable. static cairo_surface_t * open_wuffs(wuffs_base__image_decoder *dec, wuffs_base__io_buffer src, const FivIoOpenContext *ioctx, GError **error) { struct load_wuffs_frame_context ctx = { .dec = dec, .src = &src, .target = ioctx->screen_profile}; // TODO(p): PNG text chunks, like we do with PNG thumbnails. // TODO(p): See if something could and should be done about // https://www.w3.org/TR/png-hdr-pq/ wuffs_base__image_decoder__set_report_metadata( ctx.dec, WUFFS_BASE__FOURCC__EXIF, true); wuffs_base__image_decoder__set_report_metadata( ctx.dec, WUFFS_BASE__FOURCC__ICCP, true); wuffs_base__image_decoder__set_report_metadata( ctx.dec, WUFFS_BASE__FOURCC__SRGB, true); wuffs_base__image_decoder__set_report_metadata( ctx.dec, WUFFS_BASE__FOURCC__GAMA, true); double gamma = 0; while (true) { wuffs_base__status status = wuffs_base__image_decoder__decode_image_config( ctx.dec, &ctx.cfg, ctx.src); if (wuffs_base__status__is_ok(&status)) break; if (status.repr != wuffs_base__note__metadata_reported) { set_error(error, wuffs_base__status__message(&status)); goto fail; } wuffs_base__more_information minfo = {}; GBytes *bytes = NULL; if (!(bytes = pull_metadata(ctx.dec, ctx.src, &minfo, error))) goto fail; switch (wuffs_base__more_information__metadata__fourcc(&minfo)) { case WUFFS_BASE__FOURCC__EXIF: if (ctx.meta_exif) { add_warning(ioctx, "ignoring repeated Exif"); break; } ctx.meta_exif = bytes; continue; case WUFFS_BASE__FOURCC__ICCP: if (ctx.meta_iccp) { add_warning(ioctx, "ignoring repeated ICC profile"); break; } ctx.meta_iccp = bytes; continue; case WUFFS_BASE__FOURCC__XMP: if (ctx.meta_xmp) { add_warning(ioctx, "ignoring repeated XMP"); break; } ctx.meta_xmp = bytes; continue; case WUFFS_BASE__FOURCC__SRGB: gamma = 2.2; break; case WUFFS_BASE__FOURCC__GAMA: gamma = 1e5 / wuffs_base__more_information__metadata_parsed__gama(&minfo); break; } g_bytes_unref(bytes); } // This, at least currently, seems excessive. if (!wuffs_base__image_config__is_valid(&ctx.cfg)) { set_error(error, "invalid Wuffs image configuration"); goto fail; } // We need to check because of the Cairo API. ctx.width = wuffs_base__pixel_config__width(&ctx.cfg.pixcfg); ctx.height = wuffs_base__pixel_config__height(&ctx.cfg.pixcfg); if (ctx.width > INT_MAX || ctx.height > INT_MAX) { set_error(error, "image dimensions overflow"); goto fail; } // TODO(p): Improve our simplistic PNG handling of: gAMA, cHRM, sRGB. if (ctx.target) { if (ctx.meta_iccp) ctx.source = fiv_io_profile_new_from_bytes(ctx.meta_iccp); else if (isfinite(gamma) && gamma > 0) ctx.source = fiv_io_profile_new_sRGB_gamma(gamma); } // Wuffs maps tRNS to BGRA in `decoder.decode_trns?`, we should be fine. // wuffs_base__pixel_format__transparency() doesn't reflect the image file. bool opaque = wuffs_base__image_config__first_frame_is_opaque(&ctx.cfg); // Wuffs' API is kind of awful--we want to catch wide RGB and wide grey. wuffs_base__pixel_format srcfmt = wuffs_base__pixel_config__pixel_format(&ctx.cfg.pixcfg); uint32_t bpp = wuffs_base__pixel_format__bits_per_pixel(&srcfmt); // Cairo doesn't support transparency with RGB30, so no premultiplication. ctx.pack_16_10 = opaque && (bpp > 24 || (bpp < 24 && bpp > 8)); #ifdef FIV_CAIRO_RGBA128F ctx.expand_16_float = !opaque && (bpp > 24 || (bpp < 24 && bpp > 8)); #endif // FIV_CAIRO_RGBA128F // In Wuffs, /doc/note/pixel-formats.md declares "memory order", which, // for our purposes, means big endian, and BGRA results in 32-bit ARGB // on most machines. // // XXX: WUFFS_BASE__PIXEL_FORMAT__ARGB_PREMUL is not expressible, only RGBA. // Wuffs doesn't support big-endian architectures at all, we might want to // fall back to spng in such cases, or do a second conversion. uint32_t wuffs_format = WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL; // CAIRO_FORMAT_ARGB32: "The 32-bit quantities are stored native-endian. // Pre-multiplied alpha is used." CAIRO_FORMAT_RGB{24,30} are analogous. ctx.cairo_format = CAIRO_FORMAT_ARGB32; #ifdef FIV_CAIRO_RGBA128F if (ctx.expand_16_float) { wuffs_format = WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE; ctx.cairo_format = CAIRO_FORMAT_RGBA128F; } else #endif // FIV_CAIRO_RGBA128F if (ctx.pack_16_10) { // TODO(p): Make Wuffs support A2RGB30 as a destination format; // in general, 16-bit depth swizzlers are stubbed. // See also wuffs_base__pixel_swizzler__prepare__*(). wuffs_format = WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE; ctx.cairo_format = CAIRO_FORMAT_RGB30; } else if (opaque) { // BGRX doesn't have as wide swizzler support, namely in GIF. // Moreover, follower frames may still be partly transparent. // Therefore, we choose to keep "wuffs_format" intact. ctx.cairo_format = CAIRO_FORMAT_RGB24; } else if (!ctx.target) { wuffs_format = WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL; } wuffs_base__pixel_config__set(&ctx.cfg.pixcfg, wuffs_format, WUFFS_BASE__PIXEL_SUBSAMPLING__NONE, ctx.width, ctx.height); uint64_t workbuf_len_max_incl = wuffs_base__image_decoder__workbuf_len(ctx.dec).max_incl; if (workbuf_len_max_incl) { ctx.workbuf = wuffs_base__malloc_slice_u8(malloc, workbuf_len_max_incl); if (!ctx.workbuf.ptr) { set_error(error, "failed to allocate a work buffer"); goto fail; } } while (load_wuffs_frame(&ctx, error)) if (ioctx->first_frame_only) break; // Wrap the chain around, since our caller receives only one pointer. if (ctx.result) cairo_surface_set_user_data( ctx.result, &fiv_io_key_frame_previous, ctx.result_tail, NULL); fail: free(ctx.workbuf.ptr); g_clear_pointer(&ctx.meta_exif, g_bytes_unref); g_clear_pointer(&ctx.meta_iccp, g_bytes_unref); g_clear_pointer(&ctx.meta_xmp, g_bytes_unref); g_clear_pointer(&ctx.source, fiv_io_profile_free); return ctx.result; } static cairo_surface_t * open_wuffs_using(wuffs_base__image_decoder *(*allocate)(), const char *data, gsize len, const FivIoOpenContext *ctx, GError **error) { wuffs_base__image_decoder *dec = allocate(); if (!dec) { set_error(error, "memory allocation failed or internal error"); return NULL; } cairo_surface_t *surface = open_wuffs(dec, wuffs_base__ptr_u8__reader((uint8_t *) data, len, TRUE), ctx, error); free(dec); return surface; } // --- Wuffs for PNG thumbnails ------------------------------------------------ static bool pull_metadata_kvp(wuffs_png__decoder *dec, wuffs_base__io_buffer *src, GHashTable *texts, gchar **key, GError **error) { wuffs_base__more_information minfo = {}; GBytes *bytes = NULL; if (!(bytes = pull_metadata( wuffs_png__decoder__upcast_as__wuffs_base__image_decoder(dec), src, &minfo, error))) return false; switch (wuffs_base__more_information__metadata__fourcc(&minfo)) { case WUFFS_BASE__FOURCC__KVPK: g_assert(*key == NULL); *key = g_strndup( g_bytes_get_data(bytes, NULL), g_bytes_get_size(bytes)); break; case WUFFS_BASE__FOURCC__KVPV: g_assert(*key != NULL); g_hash_table_insert(texts, *key, g_strndup( g_bytes_get_data(bytes, NULL), g_bytes_get_size(bytes))); *key = NULL; } g_bytes_unref(bytes); return true; } // An uncomplicated variant of fiv_io_open(), might be up for refactoring. cairo_surface_t * fiv_io_open_png_thumbnail(const char *path, GError **error) { wuffs_png__decoder dec = {}; wuffs_base__status status = wuffs_png__decoder__initialize( &dec, sizeof dec, WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED); if (!wuffs_base__status__is_ok(&status)) { set_error(error, wuffs_base__status__message(&status)); return NULL; } gchar *data = NULL; gsize len = 0; if (!g_file_get_contents(path, &data, &len, error)) return NULL; wuffs_base__io_buffer src = wuffs_base__ptr_u8__reader((uint8_t *) data, len, TRUE); wuffs_png__decoder__set_report_metadata( &dec, WUFFS_BASE__FOURCC__KVP, true); wuffs_base__image_config cfg = {}; wuffs_base__slice_u8 workbuf = {}; cairo_surface_t *surface = NULL; bool success = false; GHashTable *texts = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free); gchar *key = NULL; while (true) { status = wuffs_png__decoder__decode_image_config(&dec, &cfg, &src); if (wuffs_base__status__is_ok(&status)) break; if (status.repr != wuffs_base__note__metadata_reported) { set_error(error, wuffs_base__status__message(&status)); goto fail; } if (!pull_metadata_kvp(&dec, &src, texts, &key, error)) goto fail; } g_assert(key == NULL); uint32_t width = wuffs_base__pixel_config__width(&cfg.pixcfg); uint32_t height = wuffs_base__pixel_config__height(&cfg.pixcfg); if (width > INT16_MAX || height > INT16_MAX) { set_error(error, "image dimensions overflow"); goto fail; } wuffs_base__pixel_config__set(&cfg.pixcfg, WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL, WUFFS_BASE__PIXEL_SUBSAMPLING__NONE, width, height); uint64_t workbuf_len_max_incl = wuffs_png__decoder__workbuf_len(&dec).max_incl; if (workbuf_len_max_incl) { workbuf = wuffs_base__malloc_slice_u8(malloc, workbuf_len_max_incl); if (!workbuf.ptr) { set_error(error, "failed to allocate a work buffer"); goto fail; } } surface = cairo_image_surface_create( wuffs_base__image_config__first_frame_is_opaque(&cfg) ? CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_ARGB32, width, height); cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { set_error(error, cairo_status_to_string(surface_status)); goto fail; } wuffs_base__pixel_buffer pb = {}; status = wuffs_base__pixel_buffer__set_from_slice(&pb, &cfg.pixcfg, wuffs_base__make_slice_u8(cairo_image_surface_get_data(surface), cairo_image_surface_get_stride(surface) * cairo_image_surface_get_height(surface))); if (!wuffs_base__status__is_ok(&status)) { set_error(error, wuffs_base__status__message(&status)); goto fail; } status = wuffs_png__decoder__decode_frame(&dec, &pb, &src, WUFFS_BASE__PIXEL_BLEND__SRC, workbuf, NULL); if (!wuffs_base__status__is_ok(&status)) { set_error(error, wuffs_base__status__message(&status)); goto fail; } // The specification does not say where the required metadata should be, // it could very well be broken up into two parts. wuffs_base__frame_config fc = {}; while (true) { // Not interested in APNG, might even throw an error in that case. status = wuffs_png__decoder__decode_frame_config(&dec, &fc, &src); if (status.repr == wuffs_base__note__end_of_data || wuffs_base__status__is_ok(&status)) break; if (status.repr != wuffs_base__note__metadata_reported) { set_error(error, wuffs_base__status__message(&status)); goto fail; } if (!pull_metadata_kvp(&dec, &src, texts, &key, error)) goto fail; } g_assert(key == NULL); cairo_surface_mark_dirty(surface); cairo_surface_set_user_data(surface, &fiv_io_key_text, g_hash_table_ref(texts), (cairo_destroy_func_t) g_hash_table_unref); success = true; fail: if (!success) g_clear_pointer(&surface, cairo_surface_destroy); free(workbuf.ptr); g_free(data); g_hash_table_unref(texts); return surface; } // --- JPEG -------------------------------------------------------------------- static GBytes * parse_jpeg_metadata(cairo_surface_t *surface, const char *data, gsize len) { // Because the JPEG file format is simple, just do it manually. // See: https://www.w3.org/Graphics/JPEG/itu-t81.pdf enum { APP0 = 0xE0, APP1, APP2, RST0 = 0xD0, RST1, RST2, RST3, RST4, RST5, RST6, RST7, SOI = 0xD8, EOI = 0xD9, SOS = 0xDA, TEM = 0x01, }; GByteArray *exif = g_byte_array_new(), *icc = g_byte_array_new(); int icc_sequence = 0, icc_done = FALSE; const guint8 *p = (const guint8 *) data, *end = p + len; while (p + 3 < end && *p++ == 0xFF && *p != SOS && *p != EOI) { // The previous byte is a fill byte, restart. if (*p == 0xFF) continue; // These markers stand alone, not starting a marker segment. guint8 marker = *p++; switch (marker) { case RST0: case RST1: case RST2: case RST3: case RST4: case RST5: case RST6: case RST7: case SOI: case TEM: continue; } // Do not bother validating the structure. guint16 length = p[0] << 8 | p[1]; const guint8 *payload = p + 2; if (G_UNLIKELY((p += length) > end)) break; // https://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf 4.7.2 // Adobe XMP Specification Part 3: Storage in Files, 2020/1, 1.1.3 // Not checking the padding byte is intentional. if (marker == APP1 && p - payload >= 6 && !memcmp(payload, "Exif\0", 5) && !exif->len) { payload += 6; g_byte_array_append(exif, payload, p - payload); } // https://www.color.org/specification/ICC1v43_2010-12.pdf B.4 if (marker == APP2 && p - payload >= 14 && !memcmp(payload, "ICC_PROFILE\0", 12) && !icc_done && payload[12] == ++icc_sequence && payload[13] >= payload[12]) { payload += 14; g_byte_array_append(icc, payload, p - payload); icc_done = payload[-1] == icc_sequence; } // TODO(p): Extract the main XMP segment. } if (exif->len) cairo_surface_set_user_data(surface, &fiv_io_key_exif, g_byte_array_free_to_bytes(exif), (cairo_destroy_func_t) g_bytes_unref); else g_byte_array_free(exif, TRUE); GBytes *icc_profile = NULL; if (icc_done) cairo_surface_set_user_data(surface, &fiv_io_key_icc, (icc_profile = g_byte_array_free_to_bytes(icc)), (cairo_destroy_func_t) g_bytes_unref); else g_byte_array_free(icc, TRUE); return icc_profile; } static void load_jpeg_finalize(cairo_surface_t *surface, bool cmyk, FivIoProfile destination, const char *data, size_t len) { GBytes *icc_profile = parse_jpeg_metadata(surface, data, len); FivIoProfile source = NULL; if (icc_profile) source = fiv_io_profile_new( g_bytes_get_data(icc_profile, NULL), g_bytes_get_size(icc_profile)); if (cmyk) fiv_io_profile_cmyk(surface, source, destination); else fiv_io_profile_xrgb32(surface, source, destination); if (source) fiv_io_profile_free(source); // Pixel data has been written, need to let Cairo know. cairo_surface_mark_dirty(surface); } static cairo_surface_t * open_libjpeg_turbo( const char *data, gsize len, const FivIoOpenContext *ctx, GError **error) { // Note that there doesn't seem to be much of a point in using this // simplified API anymore, because JPEG-QS needs the original libjpeg API. // It's just more or less duplicated code which won't compile with // the slow version of the library. tjhandle dec = tjInitDecompress(); if (!dec) { set_error(error, tjGetErrorStr2(dec)); return NULL; } int width = 0, height = 0, subsampling = TJSAMP_444, colorspace = TJCS_RGB; if (tjDecompressHeader3(dec, (const unsigned char *) data, len, &width, &height, &subsampling, &colorspace)) { set_error(error, tjGetErrorStr2(dec)); tjDestroy(dec); return NULL; } bool use_cmyk = colorspace == TJCS_CMYK || colorspace == TJCS_YCCK; int pixel_format = use_cmyk ? TJPF_CMYK : (G_BYTE_ORDER == G_LITTLE_ENDIAN ? TJPF_BGRX : TJPF_XRGB); // The limit of Cairo/pixman is 32767. but JPEG can go as high as 65535. // Prevent Cairo from throwing an error, and make use of libjpeg's scaling. // gdk-pixbuf circumvents this check, producing unrenderable surfaces. const int max = 32767; int nfs = 0; tjscalingfactor *fs = tjGetScalingFactors(&nfs), f = {0, 1}; if (fs && (width > max || height > max)) { for (int i = 0; i < nfs; i++) { if (TJSCALED(width, fs[i]) <= max && TJSCALED(height, fs[i]) <= max && fs[i].num * f.denom > f.num * fs[i].denom) f = fs[i]; } add_warning(ctx, "the image is too large, and had to be scaled by %d/%d", f.num, f.denom); width = TJSCALED(width, f); height = TJSCALED(height, f); } cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height); cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { set_error(error, cairo_status_to_string(surface_status)); cairo_surface_destroy(surface); tjDestroy(dec); return NULL; } // Starting to modify pixel data directly. Probably an unnecessary call. cairo_surface_flush(surface); int stride = cairo_image_surface_get_stride(surface); if (tjDecompress2(dec, (const unsigned char *) data, len, cairo_image_surface_get_data(surface), width, stride, height, pixel_format, TJFLAG_ACCURATEDCT)) { if (tjGetErrorCode(dec) == TJERR_WARNING) { add_warning(ctx, "%s", tjGetErrorStr2(dec)); } else { set_error(error, tjGetErrorStr2(dec)); cairo_surface_destroy(surface); tjDestroy(dec); return NULL; } } load_jpeg_finalize(surface, use_cmyk, ctx->screen_profile, data, len); tjDestroy(dec); return surface; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #ifdef HAVE_JPEG_QS struct libjpeg_error_mgr { struct jpeg_error_mgr pub; jmp_buf buf; GError **error; }; static void libjpeg_error_exit(j_common_ptr cinfo) { struct libjpeg_error_mgr *err = (struct libjpeg_error_mgr *) cinfo->err; char buf[JMSG_LENGTH_MAX] = ""; (*cinfo->err->format_message)(cinfo, buf); set_error(err->error, buf); longjmp(err->buf, 1); } static cairo_surface_t * open_libjpeg_enhanced( const char *data, gsize len, const FivIoOpenContext *ctx, GError **error) { cairo_surface_t *volatile surface = NULL; struct libjpeg_error_mgr jerr = {.error = error}; struct jpeg_decompress_struct cinfo = {.err = jpeg_std_error(&jerr.pub)}; jerr.pub.error_exit = libjpeg_error_exit; if (setjmp(jerr.buf)) { g_clear_pointer(&surface, cairo_surface_destroy); jpeg_destroy_decompress(&cinfo); return NULL; } jpeg_create_decompress(&cinfo); jpeg_mem_src(&cinfo, (const unsigned char *) data, len); (void) jpeg_read_header(&cinfo, true); bool use_cmyk = cinfo.jpeg_color_space == JCS_CMYK || cinfo.jpeg_color_space == JCS_YCCK; if (use_cmyk) cinfo.out_color_space = JCS_CMYK; else if (G_BYTE_ORDER == G_BIG_ENDIAN) cinfo.out_color_space = JCS_EXT_XRGB; else cinfo.out_color_space = JCS_EXT_BGRX; jpeg_calc_output_dimensions(&cinfo); int width = cinfo.output_width; int height = cinfo.output_height; surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height); cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { set_error(error, cairo_status_to_string(surface_status)); longjmp(jerr.buf, 1); } unsigned char *surface_data = cairo_image_surface_get_data(surface); int surface_stride = cairo_image_surface_get_stride(surface); JSAMPARRAY lines = (*cinfo.mem->alloc_small)( (j_common_ptr) &cinfo, JPOOL_IMAGE, sizeof *lines * height); for (int i = 0; i < height; i++) lines[i] = surface_data + i * surface_stride; // Go for the maximum quality setting. jpegqs_control_t opts = { .flags = JPEGQS_DIAGONALS | JPEGQS_JOINT_YUV | JPEGQS_UPSAMPLE_UV, .threads = g_get_num_processors(), .niter = 3, }; (void) jpegqs_start_decompress(&cinfo, &opts); while (cinfo.output_scanline < cinfo.output_height) (void) jpeg_read_scanlines(&cinfo, lines + cinfo.output_scanline, cinfo.output_height - cinfo.output_scanline); if (cinfo.out_color_space == JCS_CMYK) trivial_cmyk_to_host_byte_order_argb( surface_data, cinfo.output_width * cinfo.output_height); (void) jpegqs_finish_decompress(&cinfo); load_jpeg_finalize(surface, use_cmyk, ctx->screen_profile, data, len); jpeg_destroy_decompress(&cinfo); return surface; } #else #define open_libjpeg_enhanced open_libjpeg_turbo #endif // --- WebP -------------------------------------------------------------------- static const char * load_libwebp_error(VP8StatusCode err) { switch (err) { case VP8_STATUS_OK: return "OK"; case VP8_STATUS_OUT_OF_MEMORY: return "out of memory"; case VP8_STATUS_INVALID_PARAM: return "invalid parameter"; case VP8_STATUS_BITSTREAM_ERROR: return "bitstream error"; case VP8_STATUS_UNSUPPORTED_FEATURE: return "unsupported feature"; case VP8_STATUS_SUSPENDED: return "suspended"; case VP8_STATUS_USER_ABORT: return "user abort"; case VP8_STATUS_NOT_ENOUGH_DATA: return "not enough data"; default: return "general failure"; } } static cairo_surface_t * load_libwebp_nonanimated(WebPDecoderConfig *config, const WebPData *wd, const FivIoOpenContext *ctx, GError **error) { cairo_surface_t *surface = cairo_image_surface_create( config->input.has_alpha ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24, config->input.width, config->input.height); cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { set_error(error, cairo_status_to_string(surface_status)); cairo_surface_destroy(surface); return NULL; } config->options.use_threads = true; config->output.width = config->input.width; config->output.height = config->input.height; config->output.is_external_memory = true; config->output.u.RGBA.rgba = cairo_image_surface_get_data(surface); config->output.u.RGBA.stride = cairo_image_surface_get_stride(surface); config->output.u.RGBA.size = config->output.u.RGBA.stride * cairo_image_surface_get_height(surface); bool premultiply = !ctx->screen_profile; if (G_BYTE_ORDER == G_LITTLE_ENDIAN) config->output.colorspace = premultiply ? MODE_bgrA : MODE_BGRA; else config->output.colorspace = premultiply ? MODE_Argb : MODE_ARGB; WebPIDecoder *idec = WebPIDecode(NULL, 0, config); if (!idec) { set_error(error, "WebP decoding error"); cairo_surface_destroy(surface); return NULL; } VP8StatusCode err = WebPIUpdate(idec, wd->bytes, wd->size); cairo_surface_mark_dirty(surface); int x = 0, y = 0, w = 0, h = 0; (void) WebPIDecodedArea(idec, &x, &y, &w, &h); WebPIDelete(idec); if (err == VP8_STATUS_OK) return surface; if (err != VP8_STATUS_SUSPENDED) { g_set_error(error, FIV_IO_ERROR, FIV_IO_ERROR_OPEN, "%s: %s", "WebP decoding error", load_libwebp_error(err)); cairo_surface_destroy(surface); return NULL; } add_warning(ctx, "image file is truncated"); if (config->input.has_alpha) return surface; // Always use transparent black, rather than opaque black. cairo_surface_t *masked = cairo_image_surface_create( CAIRO_FORMAT_ARGB32, config->input.width, config->input.height); cairo_t *cr = cairo_create(masked); cairo_set_source_surface(cr, surface, 0, 0); cairo_rectangle(cr, x, y, w, h); cairo_clip(cr); cairo_paint(cr); cairo_destroy(cr); cairo_surface_destroy(surface); return masked; } static cairo_surface_t * load_libwebp_frame(WebPAnimDecoder *dec, const WebPAnimInfo *info, int *last_timestamp, GError **error) { uint8_t *buf = NULL; int timestamp = 0; if (!WebPAnimDecoderGetNext(dec, &buf, ×tamp)) { set_error(error, "WebP decoding error"); return NULL; } bool is_opaque = (info->bgcolor & 0xFF) == 0xFF; uint64_t area = info->canvas_width * info->canvas_height; cairo_surface_t *surface = cairo_image_surface_create( is_opaque ? CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_ARGB32, info->canvas_width, info->canvas_height); cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { set_error(error, cairo_status_to_string(surface_status)); cairo_surface_destroy(surface); return NULL; } uint32_t *dst = (uint32_t *) cairo_image_surface_get_data(surface); if (G_BYTE_ORDER == G_LITTLE_ENDIAN) { memcpy(dst, buf, area * sizeof *dst); } else { uint32_t *src = (uint32_t *) buf; for (uint64_t i = 0; i < area; i++) *dst++ = GUINT32_FROM_LE(*src++); } cairo_surface_mark_dirty(surface); // This API is confusing and awkward. cairo_surface_set_user_data(surface, &fiv_io_key_frame_duration, (void *) (intptr_t) (timestamp - *last_timestamp), NULL); *last_timestamp = timestamp; return surface; } static cairo_surface_t * load_libwebp_animated( const WebPData *wd, const FivIoOpenContext *ctx, GError **error) { bool premultiply = !ctx->screen_profile; WebPAnimDecoderOptions options = {}; WebPAnimDecoderOptionsInit(&options); options.use_threads = true; options.color_mode = premultiply ? MODE_bgrA : MODE_BGRA; WebPAnimInfo info = {}; WebPAnimDecoder *dec = WebPAnimDecoderNew(wd, &options); WebPAnimDecoderGetInfo(dec, &info); cairo_surface_t *frames = NULL, *frames_tail = NULL; if (info.canvas_width > INT_MAX || info.canvas_height > INT_MAX) { set_error(error, "image dimensions overflow"); goto fail; } int last_timestamp = 0; while (WebPAnimDecoderHasMoreFrames(dec)) { cairo_surface_t *surface = load_libwebp_frame(dec, &info, &last_timestamp, error); if (!surface) { g_clear_pointer(&frames, cairo_surface_destroy); goto fail; } if (frames_tail) cairo_surface_set_user_data(frames_tail, &fiv_io_key_frame_next, surface, (cairo_destroy_func_t) cairo_surface_destroy); else frames = surface; cairo_surface_set_user_data( surface, &fiv_io_key_frame_previous, frames_tail, NULL); frames_tail = surface; } if (frames) { cairo_surface_set_user_data( frames, &fiv_io_key_frame_previous, frames_tail, NULL); } else { set_error(error, "the animation has no frames"); g_clear_pointer(&frames, cairo_surface_destroy); } fail: WebPAnimDecoderDelete(dec); return frames; } static cairo_surface_t * open_libwebp( const char *data, gsize len, const FivIoOpenContext *ctx, GError **error) { // It is wholly zero-initialized by libwebp. WebPDecoderConfig config = {}; if (!WebPInitDecoderConfig(&config)) { set_error(error, "libwebp version mismatch"); return NULL; } // TODO(p): Differentiate between a bad WebP, and not a WebP. VP8StatusCode err = 0; WebPData wd = {.bytes = (const uint8_t *) data, .size = len}; if ((err = WebPGetFeatures(wd.bytes, wd.size, &config.input))) { g_set_error(error, FIV_IO_ERROR, FIV_IO_ERROR_OPEN, "%s: %s", "WebP decoding error", load_libwebp_error(err)); return NULL; } cairo_surface_t *result = config.input.has_animation ? load_libwebp_animated(&wd, ctx, error) : load_libwebp_nonanimated(&config, &wd, ctx, error); if (!result) goto fail; // Of course everything has to use a different abstraction. WebPDemuxState state = WEBP_DEMUX_PARSE_ERROR; WebPDemuxer *demux = WebPDemuxPartial(&wd, &state); if (!demux) { add_warning(ctx, "demux failure while reading metadata"); goto fail; } // Releasing the demux chunk iterator is actually a no-op. // TODO(p): Avoid copy-pasting the chunk transfer code. WebPChunkIterator chunk_iter = {}; uint32_t flags = WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS); if ((flags & EXIF_FLAG) && WebPDemuxGetChunk(demux, "EXIF", 1, &chunk_iter)) { cairo_surface_set_user_data(result, &fiv_io_key_exif, g_bytes_new(chunk_iter.chunk.bytes, chunk_iter.chunk.size), (cairo_destroy_func_t) g_bytes_unref); WebPDemuxReleaseChunkIterator(&chunk_iter); } if ((flags & ICCP_FLAG) && WebPDemuxGetChunk(demux, "ICCP", 1, &chunk_iter)) { cairo_surface_set_user_data(result, &fiv_io_key_icc, g_bytes_new(chunk_iter.chunk.bytes, chunk_iter.chunk.size), (cairo_destroy_func_t) g_bytes_unref); WebPDemuxReleaseChunkIterator(&chunk_iter); } if ((flags & XMP_FLAG) && WebPDemuxGetChunk(demux, "XMP ", 1, &chunk_iter)) { cairo_surface_set_user_data(result, &fiv_io_key_xmp, g_bytes_new(chunk_iter.chunk.bytes, chunk_iter.chunk.size), (cairo_destroy_func_t) g_bytes_unref); WebPDemuxReleaseChunkIterator(&chunk_iter); } if (WebPDemuxGetChunk(demux, "THUM", 1, &chunk_iter)) { cairo_surface_set_user_data(result, &fiv_io_key_thum, g_bytes_new(chunk_iter.chunk.bytes, chunk_iter.chunk.size), (cairo_destroy_func_t) g_bytes_unref); WebPDemuxReleaseChunkIterator(&chunk_iter); } if (flags & ANIMATION_FLAG) { cairo_surface_set_user_data(result, &fiv_io_key_loops, (void *) (uintptr_t) WebPDemuxGetI(demux, WEBP_FF_LOOP_COUNT), NULL); } WebPDemuxDelete(demux); if (ctx->screen_profile) { fiv_io_profile_xrgb32_page(result, ctx->screen_profile); fiv_io_premultiply_argb32_page(result); } fail: WebPFreeDecBuffer(&config.output); return result; } // --- Optional dependencies --------------------------------------------------- #ifdef HAVE_LIBRAW // --------------------------------------------------------- static cairo_surface_t * open_libraw(const char *data, gsize len, GError **error) { // https://github.com/LibRaw/LibRaw/issues/418 libraw_data_t *iprc = libraw_init( LIBRAW_OPIONS_NO_MEMERR_CALLBACK | LIBRAW_OPIONS_NO_DATAERR_CALLBACK); if (!iprc) { set_error(error, "failed to obtain a LibRaw handle"); return NULL; } #if 0 // TODO(p): Consider setting this--the image is still likely to be // rendered suboptimally, so why not make it faster. iprc->params.half_size = 1; #endif // TODO(p): Check if we need to set anything for autorotation (sizes.flip). iprc->params.use_camera_wb = 1; iprc->params.output_color = 1; // sRGB, TODO(p): Is this used? iprc->params.output_bps = 8; // This should be the default value. int err = 0; if ((err = libraw_open_buffer(iprc, (void *) data, len))) { set_error(error, libraw_strerror(err)); libraw_close(iprc); return NULL; } // TODO(p): Do we need to check iprc->idata.raw_count? Maybe for TIFFs? if ((err = libraw_unpack(iprc))) { set_error(error, libraw_strerror(err)); libraw_close(iprc); return NULL; } #if 0 // TODO(p): I'm not sure when this is necessary or useful yet. if ((err = libraw_adjust_sizes_info_only(iprc))) { set_error(error, libraw_strerror(err)); libraw_close(iprc); return NULL; } #endif // TODO(p): Documentation says I should look at the code and do it myself. if ((err = libraw_dcraw_process(iprc))) { set_error(error, libraw_strerror(err)); libraw_close(iprc); return NULL; } // FIXME: This is shittily written to iterate over the range of // idata.colors, and will be naturally slow. libraw_processed_image_t *image = libraw_dcraw_make_mem_image(iprc, &err); if (!image) { set_error(error, libraw_strerror(err)); libraw_close(iprc); return NULL; } // This should have been transformed, and kept, respectively. if (image->colors != 3 || image->bits != 8) { set_error(error, "unexpected number of colours, or bit depth"); libraw_dcraw_clear_mem(image); libraw_close(iprc); return NULL; } int width = image->width, height = image->height; cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height); cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { set_error(error, cairo_status_to_string(surface_status)); cairo_surface_destroy(surface); libraw_dcraw_clear_mem(image); libraw_close(iprc); return NULL; } // Starting to modify pixel data directly. Probably an unnecessary call. cairo_surface_flush(surface); uint32_t *pixels = (uint32_t *) cairo_image_surface_get_data(surface); unsigned char *p = image->data; for (ushort y = 0; y < image->height; y++) { for (ushort x = 0; x < image->width; x++) { *pixels++ = 0xff000000 | (uint32_t) p[0] << 16 | (uint32_t) p[1] << 8 | (uint32_t) p[2]; p += 3; } } // Pixel data has been written, need to let Cairo know. cairo_surface_mark_dirty(surface); libraw_dcraw_clear_mem(image); libraw_close(iprc); return surface; } #endif // HAVE_LIBRAW --------------------------------------------------------- #ifdef HAVE_RESVG // ---------------------------------------------------------- typedef struct { FivIoRenderClosure parent; resvg_render_tree *tree; ///< Loaded resvg tree double width; ///< Normal width double height; ///< Normal height } FivIoRenderClosureResvg; static void load_resvg_destroy(void *closure) { FivIoRenderClosureResvg *self = closure; resvg_tree_destroy(self->tree); g_free(self); } static cairo_surface_t * load_resvg_render_internal( FivIoRenderClosureResvg *self, double scale, GError **error) { double w = ceil(self->width * scale), h = ceil(self->height * scale); if (w > SHRT_MAX || h > SHRT_MAX) { set_error(error, "image dimensions overflow"); return NULL; } cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h); cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { set_error(error, cairo_status_to_string(surface_status)); cairo_surface_destroy(surface); return NULL; } uint32_t *pixels = (uint32_t *) cairo_image_surface_get_data(surface); resvg_fit_to fit_to = { scale == 1 ? RESVG_FIT_TO_TYPE_ORIGINAL : RESVG_FIT_TO_TYPE_ZOOM, scale}; resvg_render(self->tree, fit_to, resvg_transform_identity(), cairo_image_surface_get_width(surface), cairo_image_surface_get_height(surface), (char *) pixels); // TODO(p): Also apply colour management, we'll need to un-premultiply. for (int i = 0; i < w * h; i++) { uint32_t rgba = g_ntohl(pixels[i]); pixels[i] = rgba << 24 | rgba >> 8; } cairo_surface_mark_dirty(surface); return surface; } static cairo_surface_t * load_resvg_render(FivIoRenderClosure *closure, double scale) { FivIoRenderClosureResvg *self = (FivIoRenderClosureResvg *) closure; return load_resvg_render_internal(self, scale, NULL); } static const char * load_resvg_error(int err) { switch (err) { case RESVG_ERROR_NOT_AN_UTF8_STR: return "not a UTF-8 string"; case RESVG_ERROR_FILE_OPEN_FAILED: return "I/O failure"; case RESVG_ERROR_MALFORMED_GZIP: return "malformed gzip"; case RESVG_ERROR_ELEMENTS_LIMIT_REACHED: return "element limit reached"; case RESVG_ERROR_INVALID_SIZE: return "invalid or unspecified image size"; case RESVG_ERROR_PARSING_FAILED: return "parsing failed"; default: return "general failure"; } } static cairo_surface_t * open_resvg( const char *data, gsize len, const FivIoOpenContext *ctx, GError **error) { GFile *file = g_file_new_for_uri(ctx->uri); GFile *base_file = g_file_get_parent(file); g_object_unref(file); resvg_options *opt = resvg_options_create(); resvg_options_load_system_fonts(opt); if (base_file) resvg_options_set_resources_dir(opt, g_file_peek_path(base_file)); if (ctx->screen_dpi) resvg_options_set_dpi(opt, ctx->screen_dpi); resvg_render_tree *tree = NULL; int err = resvg_parse_tree_from_data(data, len, opt, &tree); resvg_options_destroy(opt); g_clear_object(&base_file); if (err != RESVG_OK) { set_error(error, load_resvg_error(err)); return NULL; } // TODO(p): See if there is a situation for resvg_get_image_viewbox(). resvg_size size = resvg_get_image_size(tree); FivIoRenderClosureResvg *closure = g_malloc0(sizeof *closure); closure->parent.render = load_resvg_render; closure->tree = tree; closure->width = size.width; closure->height = size.height; cairo_surface_t *surface = load_resvg_render_internal(closure, 1., error); if (!surface) { load_resvg_destroy(closure); return NULL; } cairo_surface_set_user_data( surface, &fiv_io_key_render, closure, load_resvg_destroy); return surface; } #endif // HAVE_RESVG ---------------------------------------------------------- #ifdef HAVE_LIBRSVG // -------------------------------------------------------- typedef struct { FivIoRenderClosure parent; RsvgHandle *handle; ///< Loaded rsvg handle double width; ///< Normal width double height; ///< Normal height } FivIoRenderClosureLibrsvg; static void load_librsvg_destroy(void *closure) { FivIoRenderClosureLibrsvg *self = closure; g_object_unref(self->handle); g_free(self); } static cairo_surface_t * load_librsvg_render(FivIoRenderClosure *closure, double scale) { FivIoRenderClosureLibrsvg *self = (FivIoRenderClosureLibrsvg *) closure; RsvgRectangle viewport = {.x = 0, .y = 0, .width = self->width * scale, .height = self->height * scale}; cairo_surface_t *surface = cairo_image_surface_create( CAIRO_FORMAT_ARGB32, ceil(viewport.width), ceil(viewport.height)); GError *error = NULL; cairo_t *cr = cairo_create(surface); (void) rsvg_handle_render_document(self->handle, cr, &viewport, &error); cairo_destroy(cr); if (error) { g_debug("%s", error->message); g_error_free(error); cairo_surface_destroy(surface); return NULL; } cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { g_debug("%s", cairo_status_to_string(surface_status)); cairo_surface_destroy(surface); return NULL; } return surface; } static cairo_surface_t * open_librsvg( const char *data, gsize len, const FivIoOpenContext *ctx, GError **error) { GFile *base_file = g_file_new_for_uri(ctx->uri); GInputStream *is = g_memory_input_stream_new_from_data(data, len, NULL); RsvgHandle *handle = rsvg_handle_new_from_stream_sync( is, base_file, RSVG_HANDLE_FLAG_KEEP_IMAGE_DATA, NULL, error); g_object_unref(base_file); g_object_unref(is); if (!handle) return NULL; rsvg_handle_set_dpi(handle, ctx->screen_dpi); double w = 0, h = 0; #if LIBRSVG_CHECK_VERSION(2, 51, 0) if (!rsvg_handle_get_intrinsic_size_in_pixels(handle, &w, &h)) { #else RsvgDimensionData dd = {}; rsvg_handle_get_dimensions(handle, &dd); if ((w = dd.width) <= 0 || (h = dd.height) <= 0) { #endif RsvgRectangle viewbox = {}; gboolean has_viewport = FALSE; rsvg_handle_get_intrinsic_dimensions( handle, NULL, NULL, NULL, NULL, &has_viewport, &viewbox); if (!has_viewport) { set_error(error, "cannot compute pixel dimensions"); g_object_unref(handle); return NULL; } w = viewbox.width; h = viewbox.height; } // librsvg rasterizes filters, so this method isn't fully appropriate. // It might be worth removing altogether. cairo_rectangle_t extents = { .x = 0, .y = 0, .width = ceil(w), .height = ceil(h)}; cairo_surface_t *surface = cairo_recording_surface_create(CAIRO_CONTENT_COLOR_ALPHA, &extents); cairo_t *cr = cairo_create(surface); RsvgRectangle viewport = {.x = 0, .y = 0, .width = w, .height = h}; if (!rsvg_handle_render_document(handle, cr, &viewport, error)) { cairo_surface_destroy(surface); cairo_destroy(cr); g_object_unref(handle); return NULL; } cairo_destroy(cr); FivIoRenderClosureLibrsvg *closure = g_malloc0(sizeof *closure); closure->parent.render = load_librsvg_render; closure->handle = handle; closure->width = w; closure->height = h; cairo_surface_set_user_data( surface, &fiv_io_key_render, closure, load_librsvg_destroy); return surface; } #endif // HAVE_LIBRSVG -------------------------------------------------------- #ifdef HAVE_XCURSOR //--------------------------------------------------------- // fmemopen is part of POSIX-1.2008, this exercise is technically unnecessary. // libXcursor checks for EOF rather than -1, it may eat your hamster. struct fiv_io_xcursor { XcursorFile parent; unsigned char *data; long position, len; }; static int fiv_io_xcursor_read(XcursorFile *file, unsigned char *buf, int len) { struct fiv_io_xcursor *fix = (struct fiv_io_xcursor *) file; if (fix->position < 0 || fix->position > fix->len) { errno = EOVERFLOW; return -1; } long n = MIN(fix->len - fix->position, len); if (n > G_MAXINT) { errno = EIO; return -1; } memcpy(buf, fix->data + fix->position, n); fix->position += n; return n; } static int fiv_io_xcursor_write(G_GNUC_UNUSED XcursorFile *file, G_GNUC_UNUSED unsigned char *buf, G_GNUC_UNUSED int len) { errno = EBADF; return -1; } static int fiv_io_xcursor_seek(XcursorFile *file, long offset, int whence) { struct fiv_io_xcursor *fix = (struct fiv_io_xcursor *) file; switch (whence) { case SEEK_SET: fix->position = offset; break; case SEEK_CUR: fix->position += offset; break; case SEEK_END: fix->position = fix->len + offset; break; default: errno = EINVAL; return -1; } // This is technically too late for fseek(), but libXcursor doesn't care. if (fix->position < 0) { errno = EINVAL; return -1; } return fix->position; } static const XcursorFile fiv_io_xcursor_adaptor = { .closure = NULL, .read = fiv_io_xcursor_read, .write = fiv_io_xcursor_write, .seek = fiv_io_xcursor_seek, }; static cairo_surface_t * open_xcursor(const char *data, gsize len, GError **error) { if (len > G_MAXLONG) { set_error(error, "size overflow"); return NULL; } struct fiv_io_xcursor file = { .parent = fiv_io_xcursor_adaptor, .data = (unsigned char *) data, .position = 0, .len = len, }; XcursorImages *images = XcursorXcFileLoadAllImages(&file.parent); if (!images) { set_error(error, "general failure"); return NULL; } // Interpret cursors as animated pages. cairo_surface_t *pages = NULL, *frames_head = NULL, *frames_tail = NULL; // XXX: Assuming that all "nominal sizes" have the same dimensions. XcursorDim last_nominal = -1; for (int i = 0; i < images->nimage; i++) { XcursorImage *image = images->images[i]; // The library automatically byte swaps in _XcursorReadImage(). cairo_surface_t *surface = cairo_image_surface_create_for_data( (unsigned char *) image->pixels, CAIRO_FORMAT_ARGB32, image->width, image->height, image->width * sizeof *image->pixels); cairo_surface_set_user_data(surface, &fiv_io_key_frame_duration, (void *) (intptr_t) image->delay, NULL); if (pages && image->size == last_nominal) { cairo_surface_set_user_data( surface, &fiv_io_key_frame_previous, frames_tail, NULL); cairo_surface_set_user_data(frames_tail, &fiv_io_key_frame_next, surface, (cairo_destroy_func_t) cairo_surface_destroy); } else if (frames_head) { cairo_surface_set_user_data( frames_head, &fiv_io_key_frame_previous, frames_tail, NULL); cairo_surface_set_user_data(frames_head, &fiv_io_key_page_next, surface, (cairo_destroy_func_t) cairo_surface_destroy); cairo_surface_set_user_data( surface, &fiv_io_key_page_previous, frames_head, NULL); frames_head = surface; } else { pages = frames_head = surface; } frames_tail = surface; last_nominal = image->size; } if (!pages) { XcursorImagesDestroy(images); return NULL; } // Wrap around animations in the last page. cairo_surface_set_user_data( frames_head, &fiv_io_key_frame_previous, frames_tail, NULL); // There is no need to copy data, assign it to the surface. static cairo_user_data_key_t key = {}; cairo_surface_set_user_data( pages, &key, images, (cairo_destroy_func_t) XcursorImagesDestroy); // Do not bother doing colour correction, there is no correct rendering. return pages; } #endif // HAVE_XCURSOR -------------------------------------------------------- #ifdef HAVE_LIBHEIF //--------------------------------------------------------- static cairo_surface_t * load_libheif_image(struct heif_image_handle *handle, GError **error) { cairo_surface_t *surface = NULL; int has_alpha = heif_image_handle_has_alpha_channel(handle); int bit_depth = heif_image_handle_get_luma_bits_per_pixel(handle); if (bit_depth < 0) { set_error(error, "undefined bit depth"); goto fail; } // Setting `convert_hdr_to_8bit` seems to be a no-op for RGBA32/64. struct heif_decoding_options *opts = heif_decoding_options_alloc(); // TODO(p): We can get 16-bit depth, in reality most likely 10-bit. struct heif_image *image = NULL; struct heif_error err = heif_decode_image(handle, &image, heif_colorspace_RGB, heif_chroma_interleaved_RGBA, opts); if (err.code != heif_error_Ok) { set_error(error, err.message); goto fail_decode; } int w = heif_image_get_width(image, heif_channel_interleaved); int h = heif_image_get_height(image, heif_channel_interleaved); surface = cairo_image_surface_create( has_alpha ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24, w, h); cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { set_error(error, cairo_status_to_string(surface_status)); cairo_surface_destroy(surface); surface = NULL; goto fail_process; } // As of writing, the library is using 16-byte alignment, unlike Cairo. int src_stride = 0; const uint8_t *src = heif_image_get_plane_readonly( image, heif_channel_interleaved, &src_stride); int dst_stride = cairo_image_surface_get_stride(surface); const uint8_t *dst = cairo_image_surface_get_data(surface); for (int y = 0; y < h; y++) { uint32_t *dstp = (uint32_t *) (dst + dst_stride * y); const uint32_t *srcp = (const uint32_t *) (src + src_stride * y); for (int x = 0; x < w; x++) { uint32_t rgba = g_ntohl(srcp[x]); *dstp++ = rgba << 24 | rgba >> 8; } } // TODO(p): Test real behaviour on real transparent images. if (has_alpha && !heif_image_handle_is_premultiplied_alpha(handle)) fiv_io_premultiply_argb32(surface); heif_item_id exif_id = 0; if (heif_image_handle_get_list_of_metadata_block_IDs( handle, "Exif", &exif_id, 1)) { size_t exif_len = heif_image_handle_get_metadata_size(handle, exif_id); void *exif = g_malloc0(exif_len); err = heif_image_handle_get_metadata(handle, exif_id, exif); if (err.code) { g_warning("%s", err.message); g_free(exif); } else { cairo_surface_set_user_data(surface, &fiv_io_key_exif, g_bytes_new_take(exif, exif_len), (cairo_destroy_func_t) g_bytes_unref); } } // https://loc.gov/preservation/digital/formats/fdd/fdd000526.shtml#factors if (heif_image_handle_get_color_profile_type(handle) == heif_color_profile_type_prof) { size_t icc_len = heif_image_handle_get_raw_color_profile_size(handle); void *icc = g_malloc0(icc_len); err = heif_image_handle_get_raw_color_profile(handle, icc); if (err.code) { g_warning("%s", err.message); g_free(icc); } else { cairo_surface_set_user_data(surface, &fiv_io_key_icc, g_bytes_new_take(icc, icc_len), (cairo_destroy_func_t) g_bytes_unref); } } cairo_surface_mark_dirty(surface); fail_process: heif_image_release(image); fail_decode: heif_decoding_options_free(opts); fail: return surface; } static void load_libheif_aux_images(const FivIoOpenContext *ioctx, struct heif_image_handle *top, cairo_surface_t **result, cairo_surface_t **result_tail) { // Include the depth image, we have no special processing for it now. int filter = LIBHEIF_AUX_IMAGE_FILTER_OMIT_ALPHA; int n = heif_image_handle_get_number_of_auxiliary_images(top, filter); heif_item_id *ids = g_malloc0_n(n, sizeof *ids); n = heif_image_handle_get_list_of_auxiliary_image_IDs(top, filter, ids, n); for (int i = 0; i < n; i++) { struct heif_image_handle *handle = NULL; struct heif_error err = heif_image_handle_get_auxiliary_image_handle(top, ids[i], &handle); if (err.code != heif_error_Ok) { add_warning(ioctx, "%s", err.message); continue; } GError *e = NULL; if (!try_append_page( load_libheif_image(handle, &e), result, result_tail)) { add_warning(ioctx, "%s", e->message); g_error_free(e); } heif_image_handle_release(handle); } g_free(ids); } static cairo_surface_t * open_libheif( const char *data, gsize len, const FivIoOpenContext *ioctx, GError **error) { // libheif will throw C++ exceptions on allocation failures. // The library is generally awful through and through. struct heif_context *ctx = heif_context_alloc(); cairo_surface_t *result = NULL, *result_tail = NULL; struct heif_error err; err = heif_context_read_from_memory_without_copy(ctx, data, len, NULL); if (err.code != heif_error_Ok) { set_error(error, err.message); goto fail_read; } int n = heif_context_get_number_of_top_level_images(ctx); heif_item_id *ids = g_malloc0_n(n, sizeof *ids); n = heif_context_get_list_of_top_level_image_IDs(ctx, ids, n); for (int i = 0; i < n; i++) { struct heif_image_handle *handle = NULL; err = heif_context_get_image_handle(ctx, ids[i], &handle); if (err.code != heif_error_Ok) { add_warning(ioctx, "%s", err.message); continue; } GError *e = NULL; if (!try_append_page( load_libheif_image(handle, &e), &result, &result_tail)) { add_warning(ioctx, "%s", e->message); g_error_free(e); } // TODO(p): Possibly add thumbnail images as well. load_libheif_aux_images(ioctx, handle, &result, &result_tail); heif_image_handle_release(handle); } if (!result) { g_clear_pointer(&result, cairo_surface_destroy); set_error(error, "empty or unsupported image"); } g_free(ids); fail_read: heif_context_free(ctx); return fiv_io_profile_finalize(result, ioctx->screen_profile); } #endif // HAVE_LIBHEIF -------------------------------------------------------- #ifdef HAVE_LIBTIFF //--------------------------------------------------------- struct fiv_io_tiff { const FivIoOpenContext *ctx; unsigned char *data; gchar *error; // No, libtiff, the offset is not supposed to be unsigned (also see: // man 0p sys_types.h), but at least it's fewer cases for us to care about. toff_t position, len; }; static tsize_t fiv_io_tiff_read(thandle_t h, tdata_t buf, tsize_t len) { struct fiv_io_tiff *io = h; if (len < 0) { // What the FUCK! This argument is not supposed to be signed! // How many mistakes can you make in such a basic API? errno = EOWNERDEAD; return -1; } if (io->position > io->len) { errno = EOVERFLOW; return -1; } toff_t n = MIN(io->len - io->position, (toff_t) len); if (n > TIFF_TMSIZE_T_MAX) { errno = EIO; return -1; } memcpy(buf, io->data + io->position, n); io->position += n; return n; } static tsize_t fiv_io_tiff_write(G_GNUC_UNUSED thandle_t h, G_GNUC_UNUSED tdata_t buf, G_GNUC_UNUSED tsize_t len) { errno = EBADF; return -1; } static toff_t fiv_io_tiff_seek(thandle_t h, toff_t offset, int whence) { struct fiv_io_tiff *io = h; switch (whence) { case SEEK_SET: io->position = offset; break; case SEEK_CUR: io->position += offset; break; case SEEK_END: io->position = io->len + offset; break; default: errno = EINVAL; return -1; } return io->position; } static int fiv_io_tiff_close(G_GNUC_UNUSED thandle_t h) { return 0; } static toff_t fiv_io_tiff_size(thandle_t h) { return ((struct fiv_io_tiff *) h)->len; } static void fiv_io_tiff_error( thandle_t h, const char *module, const char *format, va_list ap) { struct fiv_io_tiff *io = h; gchar *message = g_strdup_vprintf(format, ap); if (io->error) // I'm not sure if two errors can ever come in a succession, // but make sure to log them in any case. add_warning(io->ctx, "%s: %s", module, message); else io->error = g_strconcat(module, ": ", message, NULL); g_free(message); } static void fiv_io_tiff_warning(G_GNUC_UNUSED thandle_t h, const char *module, const char *format, va_list ap) { gchar *message = g_strdup_vprintf(format, ap); g_debug("tiff: %s: %s", module, message); g_free(message); } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static cairo_surface_t * load_libtiff_directory(TIFF *tiff, GError **error) { char emsg[1024] = ""; if (!TIFFRGBAImageOK(tiff, emsg)) { set_error(error, emsg); return NULL; } // TODO(p): Are there cases where we might not want to "stop on error"? TIFFRGBAImage image; if (!TIFFRGBAImageBegin(&image, tiff, 1 /* stop on error */, emsg)) { set_error(error, emsg); return NULL; } cairo_surface_t *surface = NULL; if (image.width > G_MAXINT || image.height >= G_MAXINT || G_MAXUINT32 / image.width < image.height) { set_error(error, "image dimensions too large"); goto fail; } surface = cairo_image_surface_create(image.alpha != EXTRASAMPLE_UNSPECIFIED ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24, image.width, image.height); image.req_orientation = ORIENTATION_LEFTTOP; uint32_t *raster = (uint32_t *) cairo_image_surface_get_data(surface); if (!TIFFRGBAImageGet(&image, raster, image.width, image.height)) { g_clear_pointer(&surface, cairo_surface_destroy); goto fail; } // Needs to be byte-swapped from ABGR to alpha-premultiplied ARGB for Cairo. for (uint64_t i = image.width * image.height; i--; ) { uint32_t pixel = raster[i]; raster[i] = TIFFGetA(pixel) << 24 | TIFFGetR(pixel) << 16 | TIFFGetG(pixel) << 8 | TIFFGetB(pixel); } // It seems that neither GIMP nor Photoshop use unassociated alpha. if (image.alpha == EXTRASAMPLE_UNASSALPHA) fiv_io_premultiply_argb32(surface); cairo_surface_mark_dirty(surface); // XXX: The whole file is essentially an Exif, any ideas? const uint32_t meta_len = 0; const void *meta = NULL; if (TIFFGetField(tiff, TIFFTAG_ICCPROFILE, &meta_len, &meta)) { cairo_surface_set_user_data(surface, &fiv_io_key_icc, g_bytes_new(meta, meta_len), (cairo_destroy_func_t) g_bytes_unref); } if (TIFFGetField(tiff, TIFFTAG_XMLPACKET, &meta_len, &meta)) { cairo_surface_set_user_data(surface, &fiv_io_key_xmp, g_bytes_new(meta, meta_len), (cairo_destroy_func_t) g_bytes_unref); } // Don't ask. The API is high, alright, I'm just not sure about the level. uint16_t orientation = 0; if (TIFFGetField(tiff, TIFFTAG_ORIENTATION, &orientation)) { if (orientation == 5 || orientation == 7) cairo_surface_set_user_data( surface, &fiv_io_key_orientation, (void *) (uintptr_t) 5, NULL); if (orientation == 6 || orientation == 8) cairo_surface_set_user_data( surface, &fiv_io_key_orientation, (void *) (uintptr_t) 7, NULL); } fail: TIFFRGBAImageEnd(&image); // TODO(p): It's possible to implement ClipPath easily with Cairo. return surface; } static cairo_surface_t * open_libtiff( const char *data, gsize len, const FivIoOpenContext *ctx, GError **error) { // Both kinds of handlers are called, redirect everything. TIFFErrorHandler eh = TIFFSetErrorHandler(NULL); TIFFErrorHandler wh = TIFFSetWarningHandler(NULL); TIFFErrorHandlerExt ehe = TIFFSetErrorHandlerExt(fiv_io_tiff_error); TIFFErrorHandlerExt whe = TIFFSetWarningHandlerExt(fiv_io_tiff_warning); struct fiv_io_tiff h = { .ctx = ctx, .data = (unsigned char *) data, .position = 0, .len = len, }; cairo_surface_t *result = NULL, *result_tail = NULL; TIFF *tiff = TIFFClientOpen(ctx->uri, "rm" /* Avoid mmap. */, &h, fiv_io_tiff_read, fiv_io_tiff_write, fiv_io_tiff_seek, fiv_io_tiff_close, fiv_io_tiff_size, NULL, NULL); if (!tiff) goto fail; // In Nikon NEF files, IFD0 is a tiny uncompressed thumbnail with SubIFDs-- // two of them JPEGs, the remaining one is raw. libtiff cannot read either // of those better versions. // // TODO(p): If NewSubfileType is ReducedImage, and it has SubIFDs compressed // as old JPEG (6), decode JPEGInterchangeFormat/JPEGInterchangeFormatLength // with libjpeg-turbo and insert them as the starting pages. // // This is not possible with libtiff directly, because TIFFSetSubDirectory() // requires an ImageLength tag that's missing, and TIFFReadCustomDirectory() // takes a privately defined struct that cannot be omitted. // // TODO(p): Samsung Android DNGs also claim to be TIFF/EP, but use a smaller // uncompressed YCbCr image. Apple ProRAW uses the new JPEG Compression (7), // with a weird Orientation. It also uses that value for its raw data. uint32_t subtype = 0; uint16_t subifd_count = 0; const uint64_t *subifd_offsets = NULL; if (TIFFGetField(tiff, TIFFTAG_SUBFILETYPE, &subtype) && (subtype & FILETYPE_REDUCEDIMAGE) && TIFFGetField(tiff, TIFFTAG_SUBIFD, &subifd_count, &subifd_offsets) && subifd_count > 0 && subifd_offsets) { } do { // We inform about unsupported directories, but do not fail on them. GError *err = NULL; if (!try_append_page( load_libtiff_directory(tiff, &err), &result, &result_tail)) { add_warning(ctx, "%s", err->message); g_error_free(err); } } while (TIFFReadDirectory(tiff)); TIFFClose(tiff); fail: if (h.error) { g_clear_pointer(&result, cairo_surface_destroy); set_error(error, h.error); g_free(h.error); } else if (!result) { set_error(error, "empty or unsupported image"); } TIFFSetErrorHandlerExt(ehe); TIFFSetWarningHandlerExt(whe); TIFFSetErrorHandler(eh); TIFFSetWarningHandler(wh); // TODO(p): Colour management even for un/associated alpha channels. // Note that TIFF has a number of fields that an ICC profile can be // constructed from--it's not a good idea to blindly assume sRGB. return fiv_io_profile_finalize(result, ctx->screen_profile); } #endif // HAVE_LIBTIFF -------------------------------------------------------- #ifdef HAVE_GDKPIXBUF // ------------------------------------------------------ static cairo_surface_t * load_gdkpixbuf_argb32_unpremultiplied(GdkPixbuf *pixbuf) { int w = gdk_pixbuf_get_width(pixbuf); int h = gdk_pixbuf_get_height(pixbuf); cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h); guint length = 0; guchar *src = gdk_pixbuf_get_pixels_with_length(pixbuf, &length); int src_stride = gdk_pixbuf_get_rowstride(pixbuf); uint32_t *dst = (uint32_t *) cairo_image_surface_get_data(surface); for (int y = 0; y < h; y++) { const guchar *p = src + y * src_stride; for (int x = 0; x < w; x++) { *dst++ = (uint32_t) p[3] << 24 | p[0] << 16 | p[1] << 8 | p[2]; p += 4; } } cairo_surface_mark_dirty(surface); return surface; } static cairo_surface_t * open_gdkpixbuf( const char *data, gsize len, const FivIoOpenContext *ctx, GError **error) { // gdk-pixbuf controls the playback itself, there is no reliable method of // extracting individual frames (due to loops). GInputStream *is = g_memory_input_stream_new_from_data(data, len, NULL); GdkPixbuf *pixbuf = gdk_pixbuf_new_from_stream(is, NULL, error); g_object_unref(is); if (!pixbuf) return NULL; bool custom_argb32 = ctx->screen_profile && gdk_pixbuf_get_has_alpha(pixbuf) && gdk_pixbuf_get_colorspace(pixbuf) == GDK_COLORSPACE_RGB && gdk_pixbuf_get_n_channels(pixbuf) == 4 && gdk_pixbuf_get_bits_per_sample(pixbuf) == 8; cairo_surface_t *surface = NULL; if (custom_argb32) surface = load_gdkpixbuf_argb32_unpremultiplied(pixbuf); else surface = gdk_cairo_surface_create_from_pixbuf(pixbuf, 1, NULL); cairo_status_t surface_status = cairo_surface_status(surface); if (surface_status != CAIRO_STATUS_SUCCESS) { set_error(error, cairo_status_to_string(surface_status)); cairo_surface_destroy(surface); g_object_unref(pixbuf); return NULL; } const char *orientation = gdk_pixbuf_get_option(pixbuf, "orientation"); if (orientation && strlen(orientation) == 1) { int n = *orientation - '0'; if (n >= 1 && n <= 8) cairo_surface_set_user_data( surface, &fiv_io_key_orientation, (void *) (uintptr_t) n, NULL); } const char *icc_profile = gdk_pixbuf_get_option(pixbuf, "icc-profile"); if (icc_profile) { gsize out_len = 0; guchar *raw = g_base64_decode(icc_profile, &out_len); if (raw) { cairo_surface_set_user_data(surface, &fiv_io_key_icc, g_bytes_new_take(raw, out_len), (cairo_destroy_func_t) g_bytes_unref); } } g_object_unref(pixbuf); if (custom_argb32) { fiv_io_profile_xrgb32_page(surface, ctx->screen_profile); fiv_io_premultiply_argb32_page(surface); } else { surface = fiv_io_profile_finalize(surface, ctx->screen_profile); } return surface; } #endif // HAVE_GDKPIXBUF ------------------------------------------------------ // TODO(p): Check that all cairo_surface_set_user_data() calls succeed. cairo_user_data_key_t fiv_io_key_exif; cairo_user_data_key_t fiv_io_key_orientation; cairo_user_data_key_t fiv_io_key_icc; cairo_user_data_key_t fiv_io_key_xmp; cairo_user_data_key_t fiv_io_key_thum; cairo_user_data_key_t fiv_io_key_text; cairo_user_data_key_t fiv_io_key_frame_next; cairo_user_data_key_t fiv_io_key_frame_previous; cairo_user_data_key_t fiv_io_key_frame_duration; cairo_user_data_key_t fiv_io_key_loops; cairo_user_data_key_t fiv_io_key_page_next; cairo_user_data_key_t fiv_io_key_page_previous; cairo_user_data_key_t fiv_io_key_render; cairo_surface_t * fiv_io_open(const FivIoOpenContext *ctx, GError **error) { // TODO(p): Don't always load everything into memory, test type first, // so that we can reject non-pictures early. Wuffs only needs the first // 17 bytes to make a guess right now. // // LibRaw poses an issue--there is no good registry for identification // of supported files. Many of them are compliant TIFF files. // The only good filtering method for RAWs are currently file extensions // extracted from shared-mime-info. // // SVG is also problematic, an unbounded search for its root element. // But problematic files can be assumed to be crafted. // // gdk-pixbuf exposes its detection data through gdk_pixbuf_get_formats(). // This may also be unbounded, as per format_check(). GFile *file = g_file_new_for_uri(ctx->uri); gchar *data = NULL; gsize len = 0; if (!g_file_load_contents(file, NULL, &data, &len, NULL, error)) return NULL; cairo_surface_t *surface = fiv_io_open_from_data(data, len, ctx, error); g_free(data); return surface; } cairo_surface_t * fiv_io_open_from_data( const char *data, size_t len, const FivIoOpenContext *ctx, GError **error) { wuffs_base__slice_u8 prefix = wuffs_base__make_slice_u8((uint8_t *) data, len); cairo_surface_t *surface = NULL; switch (wuffs_base__magic_number_guess_fourcc(prefix, true /* closed */)) { case WUFFS_BASE__FOURCC__BMP: // Note that BMP can redirect into another format, // which is so far unsupported here. surface = open_wuffs_using( wuffs_bmp__decoder__alloc_as__wuffs_base__image_decoder, data, len, ctx, error); break; case WUFFS_BASE__FOURCC__GIF: surface = open_wuffs_using( wuffs_gif__decoder__alloc_as__wuffs_base__image_decoder, data, len, ctx, error); break; case WUFFS_BASE__FOURCC__PNG: surface = open_wuffs_using( wuffs_png__decoder__alloc_as__wuffs_base__image_decoder, data, len, ctx, error); break; case WUFFS_BASE__FOURCC__TGA: surface = open_wuffs_using( wuffs_tga__decoder__alloc_as__wuffs_base__image_decoder, data, len, ctx, error); break; case WUFFS_BASE__FOURCC__JPEG: surface = ctx->enhance ? open_libjpeg_enhanced(data, len, ctx, error) : open_libjpeg_turbo(data, len, ctx, error); break; case WUFFS_BASE__FOURCC__WEBP: surface = open_libwebp(data, len, ctx, error); break; default: #ifdef HAVE_LIBRAW // --------------------------------------------------------- if ((surface = open_libraw(data, len, error))) break; // TODO(p): We should try to pass actual processing errors through, // notably only continue with LIBRAW_FILE_UNSUPPORTED. if (error) { g_debug("%s", (*error)->message); g_clear_error(error); } #endif // HAVE_LIBRAW --------------------------------------------------------- #ifdef HAVE_RESVG // ---------------------------------------------------------- if ((surface = open_resvg(data, len, ctx, error))) break; if (error) { g_debug("%s", (*error)->message); g_clear_error(error); } #endif // HAVE_RESVG ---------------------------------------------------------- #ifdef HAVE_LIBRSVG // -------------------------------------------------------- if ((surface = open_librsvg(data, len, ctx, error))) break; // XXX: It doesn't look like librsvg can return sensible errors. if (error) { g_debug("%s", (*error)->message); g_clear_error(error); } #endif // HAVE_LIBRSVG -------------------------------------------------------- #ifdef HAVE_XCURSOR //--------------------------------------------------------- if ((surface = open_xcursor(data, len, error))) break; if (error) { g_debug("%s", (*error)->message); g_clear_error(error); } #endif // HAVE_XCURSOR -------------------------------------------------------- #ifdef HAVE_LIBHEIF //--------------------------------------------------------- if ((surface = open_libheif(data, len, ctx, error))) break; if (error) { g_debug("%s", (*error)->message); g_clear_error(error); } #endif // HAVE_LIBHEIF -------------------------------------------------------- #ifdef HAVE_LIBTIFF //--------------------------------------------------------- // This needs to be positioned after LibRaw. if ((surface = open_libtiff(data, len, ctx, error))) break; if (error) { g_debug("%s", (*error)->message); g_clear_error(error); } #endif // HAVE_LIBTIFF -------------------------------------------------------- set_error(error, "unsupported file type"); } #ifdef HAVE_GDKPIXBUF // ------------------------------------------------------ // This is used as a last resort, the rest above is special-cased. if (!surface) { GError *err = NULL; if ((surface = open_gdkpixbuf(data, len, ctx, &err))) { g_clear_error(error); } else if (err->code == GDK_PIXBUF_ERROR_UNKNOWN_TYPE) { g_error_free(err); } else { g_clear_error(error); g_propagate_error(error, err); } } #endif // HAVE_GDKPIXBUF ------------------------------------------------------ // gdk-pixbuf only gives out this single field--cater to its limitations, // since we'd really like to have it. // TODO(p): The Exif orientation should be ignored in JPEG-XL at minimum. GBytes *exif = NULL; gsize exif_len = 0; gconstpointer exif_data = NULL; if (surface && (exif = cairo_surface_get_user_data(surface, &fiv_io_key_exif)) && (exif_data = g_bytes_get_data(exif, &exif_len))) { cairo_surface_set_user_data(surface, &fiv_io_key_orientation, (void *) (uintptr_t) fiv_io_exif_orientation(exif_data, exif_len), NULL); } return surface; } // --- Thumbnail passing utilities --------------------------------------------- typedef struct { guint64 user_data; int width, height, stride, format; } CairoHeader; void fiv_io_serialize_to_stdout(cairo_surface_t *surface, guint64 user_data) { if (!surface || cairo_surface_get_type(surface) != CAIRO_SURFACE_TYPE_IMAGE) return; #ifdef G_OS_UNIX // Common courtesy, this is never what the user wants. if (isatty(fileno(stdout))) return; #endif CairoHeader h = { .user_data = user_data, .width = cairo_image_surface_get_width(surface), .height = cairo_image_surface_get_height(surface), .stride = cairo_image_surface_get_stride(surface), .format = cairo_image_surface_get_format(surface), }; // Cairo lets pixman initialize image surfaces. // pixman allocates stride * height, not omitting those trailing bytes. const unsigned char *data = cairo_image_surface_get_data(surface); if (fwrite(&h, sizeof h, 1, stdout) == 1) fwrite(data, 1, h.stride * h.height, stdout); } cairo_surface_t * fiv_io_deserialize(GBytes *bytes, guint64 *user_data) { CairoHeader h = {}; GByteArray *array = g_bytes_unref_to_array(bytes); if (array->len < sizeof h) { g_byte_array_unref(array); return NULL; } h = *(CairoHeader *) array->data; if (h.width < 1 || h.height < 1 || h.stride < h.width || G_MAXSIZE / (gsize) h.stride < (gsize) h.height || array->len - sizeof h < (gsize) h.stride * (gsize) h.height) { g_byte_array_unref(array); return NULL; } cairo_surface_t *surface = cairo_image_surface_create_for_data( array->data + sizeof h, h.format, h.width, h.height, h.stride); if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) { cairo_surface_destroy(surface); g_byte_array_unref(array); return NULL; } static cairo_user_data_key_t key; cairo_surface_set_user_data( surface, &key, array, (cairo_destroy_func_t) g_byte_array_unref); *user_data = h.user_data; return surface; } // --- Filesystem -------------------------------------------------------------- #include "xdg.h" static void model_entry_finalize(FivIoModelEntry *entry) { g_free(entry->uri); g_free(entry->target_uri); g_free(entry->collate_key); } struct _FivIoModel { GObject parent_instance; GPatternSpec **supported_patterns; GFile *directory; ///< Currently loaded directory GFileMonitor *monitor; ///< "directory" monitoring GArray *subdirs; ///< "directory" contents GArray *files; ///< "directory" contents FivIoModelSort sort_field; ///< How to sort gboolean sort_descending; ///< Whether to sort in reverse gboolean filtering; ///< Only show non-hidden, supported }; G_DEFINE_TYPE(FivIoModel, fiv_io_model, G_TYPE_OBJECT) enum { PROP_FILTERING = 1, PROP_SORT_FIELD, PROP_SORT_DESCENDING, N_PROPERTIES }; static GParamSpec *model_properties[N_PROPERTIES]; enum { FILES_CHANGED, SUBDIRECTORIES_CHANGED, LAST_SIGNAL, }; // Globals are, sadly, the canonical way of storing signal numbers. static guint model_signals[LAST_SIGNAL]; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static gboolean model_supports(FivIoModel *self, const char *filename) { gchar *utf8 = g_filename_to_utf8(filename, -1, NULL, NULL, NULL); if (!utf8) return FALSE; gchar *lc = g_utf8_strdown(utf8, -1); gsize lc_length = strlen(lc); gchar *reversed = g_utf8_strreverse(lc, lc_length); g_free(utf8); // fnmatch() uses the /locale encoding/, and isn't present on Windows. // TODO(p): Consider using g_file_info_get_display_name() for direct UTF-8. gboolean result = FALSE; for (GPatternSpec **p = self->supported_patterns; *p; p++) if ((result = g_pattern_spec_match(*p, lc_length, lc, reversed))) break; g_free(lc); g_free(reversed); return result; } static inline int model_compare_entries(FivIoModel *self, const FivIoModelEntry *entry1, GFile *file1, const FivIoModelEntry *entry2, GFile *file2) { if (g_file_has_prefix(file1, file2)) return +1; if (g_file_has_prefix(file2, file1)) return -1; int result = 0; switch (self->sort_field) { case FIV_IO_MODEL_SORT_MTIME: result -= entry1->mtime_msec < entry2->mtime_msec; result += entry1->mtime_msec > entry2->mtime_msec; if (result != 0) break; // Fall-through case FIV_IO_MODEL_SORT_NAME: case FIV_IO_MODEL_SORT_COUNT: result = strcmp(entry1->collate_key, entry2->collate_key); } return self->sort_descending ? -result : +result; } static gint model_compare(gconstpointer a, gconstpointer b, gpointer user_data) { const FivIoModelEntry *entry1 = a; const FivIoModelEntry *entry2 = b; GFile *file1 = g_file_new_for_uri(entry1->uri); GFile *file2 = g_file_new_for_uri(entry2->uri); int result = model_compare_entries(user_data, entry1, file1, entry2, file2); g_object_unref(file1); g_object_unref(file2); return result; } static void model_resort(FivIoModel *self) { g_array_sort_with_data(self->subdirs, model_compare, self); g_array_sort_with_data(self->files, model_compare, self); g_signal_emit(self, model_signals[FILES_CHANGED], 0); g_signal_emit(self, model_signals[SUBDIRECTORIES_CHANGED], 0); } static gboolean model_reload(FivIoModel *self, GError **error) { g_array_set_size(self->subdirs, 0); g_array_set_size(self->files, 0); GFileEnumerator *enumerator = g_file_enumerate_children(self->directory, G_FILE_ATTRIBUTE_STANDARD_TYPE "," G_FILE_ATTRIBUTE_STANDARD_NAME "," G_FILE_ATTRIBUTE_STANDARD_TARGET_URI "," G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN "," G_FILE_ATTRIBUTE_TIME_MODIFIED "," G_FILE_ATTRIBUTE_TIME_MODIFIED_USEC, G_FILE_QUERY_INFO_NONE, NULL, error); if (!enumerator) { // Note that this has had a side-effect of clearing all entries. g_signal_emit(self, model_signals[FILES_CHANGED], 0); g_signal_emit(self, model_signals[SUBDIRECTORIES_CHANGED], 0); return FALSE; } GFileInfo *info = NULL; GFile *child = NULL; GError *e = NULL; while (TRUE) { if (!g_file_enumerator_iterate(enumerator, &info, &child, NULL, &e) && e) { g_warning("%s", e->message); g_clear_error(&e); continue; } if (!info) break; if (self->filtering && g_file_info_get_is_hidden(info)) continue; FivIoModelEntry entry = {.uri = g_file_get_uri(child), .target_uri = g_strdup(g_file_info_get_attribute_string( info, G_FILE_ATTRIBUTE_STANDARD_TARGET_URI))}; GDateTime *mtime = g_file_info_get_modification_date_time(info); if (mtime) { entry.mtime_msec = g_date_time_to_unix(mtime) * 1000 + g_date_time_get_microsecond(mtime) / 1000; g_date_time_unref(mtime); } gchar *parse_name = g_file_get_parse_name(child); // TODO(p): Make it possible to use g_utf8_collate_key() instead, // which does not use natural sorting. entry.collate_key = g_utf8_collate_key_for_filename(parse_name, -1); g_free(parse_name); const char *name = g_file_info_get_name(info); if (g_file_info_get_file_type(info) == G_FILE_TYPE_DIRECTORY) g_array_append_val(self->subdirs, entry); else if (!self->filtering || model_supports(self, name)) g_array_append_val(self->files, entry); else model_entry_finalize(&entry); } g_object_unref(enumerator); // We also emit change signals there, indirectly. model_resort(self); return TRUE; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void fiv_io_model_finalize(GObject *gobject) { FivIoModel *self = FIV_IO_MODEL(gobject); for (GPatternSpec **p = self->supported_patterns; *p; p++) g_pattern_spec_free(*p); g_free(self->supported_patterns); g_clear_object(&self->directory); g_clear_object(&self->monitor); g_array_free(self->subdirs, TRUE); g_array_free(self->files, TRUE); G_OBJECT_CLASS(fiv_io_model_parent_class)->finalize(gobject); } static void fiv_io_model_get_property( GObject *object, guint property_id, GValue *value, GParamSpec *pspec) { FivIoModel *self = FIV_IO_MODEL(object); switch (property_id) { case PROP_FILTERING: g_value_set_boolean(value, self->filtering); break; case PROP_SORT_FIELD: g_value_set_int(value, self->sort_field); break; case PROP_SORT_DESCENDING: g_value_set_boolean(value, self->sort_descending); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec); } } static void fiv_io_model_set_property( GObject *object, guint property_id, const GValue *value, GParamSpec *pspec) { FivIoModel *self = FIV_IO_MODEL(object); switch (property_id) { case PROP_FILTERING: if (self->filtering != g_value_get_boolean(value)) { self->filtering = !self->filtering; g_object_notify_by_pspec(object, model_properties[property_id]); (void) model_reload(self, NULL /* error */); } break; case PROP_SORT_FIELD: if ((int) self->sort_field != g_value_get_int(value)) { self->sort_field = g_value_get_int(value); g_object_notify_by_pspec(object, model_properties[property_id]); model_resort(self); } break; case PROP_SORT_DESCENDING: if (self->sort_descending != g_value_get_boolean(value)) { self->sort_descending = !self->sort_descending; g_object_notify_by_pspec(object, model_properties[property_id]); model_resort(self); } break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec); } } static void fiv_io_model_class_init(FivIoModelClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS(klass); object_class->get_property = fiv_io_model_get_property; object_class->set_property = fiv_io_model_set_property; object_class->finalize = fiv_io_model_finalize; model_properties[PROP_FILTERING] = g_param_spec_boolean( "filtering", "Filtering", "Only show non-hidden, supported entries", TRUE, G_PARAM_READWRITE); // TODO(p): GObject enumerations are annoying, but this should be one. model_properties[PROP_SORT_FIELD] = g_param_spec_int( "sort-field", "Sort field", "Sort order", FIV_IO_MODEL_SORT_MIN, FIV_IO_MODEL_SORT_MAX, FIV_IO_MODEL_SORT_NAME, G_PARAM_READWRITE); model_properties[PROP_SORT_DESCENDING] = g_param_spec_boolean( "sort-descending", "Sort descending", "Use reverse sort order", FALSE, G_PARAM_READWRITE); g_object_class_install_properties( object_class, N_PROPERTIES, model_properties); // TODO(p): Arguments something like: index, added, removed. model_signals[FILES_CHANGED] = g_signal_new("files-changed", G_TYPE_FROM_CLASS(klass), 0, 0, NULL, NULL, NULL, G_TYPE_NONE, 0); model_signals[SUBDIRECTORIES_CHANGED] = g_signal_new("subdirectories-changed", G_TYPE_FROM_CLASS(klass), 0, 0, NULL, NULL, NULL, G_TYPE_NONE, 0); } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void fiv_io_model_init(FivIoModel *self) { self->filtering = TRUE; char **types = fiv_io_all_supported_media_types(); char **globs = extract_mime_globs((const char **) types); g_strfreev(types); gsize n = g_strv_length(globs); self->supported_patterns = g_malloc0_n(n + 1, sizeof *self->supported_patterns); while (n--) self->supported_patterns[n] = g_pattern_spec_new(globs[n]); g_strfreev(globs); self->files = g_array_new(FALSE, TRUE, sizeof(FivIoModelEntry)); self->subdirs = g_array_new(FALSE, TRUE, sizeof(FivIoModelEntry)); g_array_set_clear_func( self->subdirs, (GDestroyNotify) model_entry_finalize); g_array_set_clear_func( self->files, (GDestroyNotify) model_entry_finalize); } gboolean fiv_io_model_open(FivIoModel *self, GFile *directory, GError **error) { g_return_val_if_fail(FIV_IS_IO_MODEL(self), FALSE); g_return_val_if_fail(G_IS_FILE(directory), FALSE); g_clear_object(&self->directory); g_clear_object(&self->monitor); self->directory = g_object_ref(directory); // TODO(p): Process the ::changed signal. self->monitor = g_file_monitor_directory( directory, G_FILE_MONITOR_WATCH_MOVES, NULL, NULL /* error */); return model_reload(self, error); } GFile * fiv_io_model_get_location(FivIoModel *self) { g_return_val_if_fail(FIV_IS_IO_MODEL(self), NULL); return self->directory; } const FivIoModelEntry * fiv_io_model_get_files(FivIoModel *self, gsize *len) { *len = self->files->len; return (const FivIoModelEntry *) self->files->data; } const FivIoModelEntry * fiv_io_model_get_subdirs(FivIoModel *self, gsize *len) { *len = self->subdirs->len; return (const FivIoModelEntry *) self->subdirs->data; } // --- Export ------------------------------------------------------------------ unsigned char * fiv_io_encode_webp( cairo_surface_t *surface, const WebPConfig *config, size_t *len) { cairo_format_t format = cairo_image_surface_get_format(surface); int w = cairo_image_surface_get_width(surface); int h = cairo_image_surface_get_height(surface); if (format != CAIRO_FORMAT_ARGB32 && format != CAIRO_FORMAT_RGB24) { cairo_surface_t *converted = cairo_image_surface_create((format = CAIRO_FORMAT_ARGB32), w, h); cairo_t *cr = cairo_create(converted); cairo_set_source_surface(cr, surface, 0, 0); cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE); cairo_paint(cr); cairo_destroy(cr); surface = converted; } else { surface = cairo_surface_reference(surface); } WebPMemoryWriter writer = {}; WebPMemoryWriterInit(&writer); WebPPicture picture = {}; if (!WebPPictureInit(&picture)) goto fail; picture.use_argb = true; picture.width = w; picture.height = h; if (!WebPPictureAlloc(&picture)) goto fail; // Cairo uses a similar internal format, so we should be able to // copy it over and fix up the minor differences. // This is written to be easy to follow rather than fast. int stride = cairo_image_surface_get_stride(surface); if (picture.argb_stride != w || picture.argb_stride * (int) sizeof *picture.argb != stride || INT_MAX / picture.argb_stride < h) goto fail_compatibility; uint32_t *argb = memcpy(picture.argb, cairo_image_surface_get_data(surface), stride * h); if (format == CAIRO_FORMAT_ARGB32) for (int i = h * picture.argb_stride; i-- > 0; argb++) *argb = wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(*argb); else for (int i = h * picture.argb_stride; i-- > 0; argb++) *argb |= 0xFF000000; // TODO(p): Prevent or propagate VP8_ENC_ERROR_BAD_DIMENSION. picture.writer = WebPMemoryWrite; picture.custom_ptr = &writer; if (!WebPEncode(config, &picture)) g_debug("WebPEncode: %d\n", picture.error_code); fail_compatibility: WebPPictureFree(&picture); fail: cairo_surface_destroy(surface); *len = writer.size; return writer.mem; } static WebPData encode_lossless_webp(cairo_surface_t *surface) { WebPData bitstream = {}; WebPConfig config = {}; if (!WebPConfigInit(&config) || !WebPConfigLosslessPreset(&config, 6)) return bitstream; config.thread_level = true; if (!WebPValidateConfig(&config)) return bitstream; bitstream.bytes = fiv_io_encode_webp(surface, &config, &bitstream.size); return bitstream; } static gboolean encode_webp_image(WebPMux *mux, cairo_surface_t *frame) { WebPData bitstream = encode_lossless_webp(frame); gboolean ok = WebPMuxSetImage(mux, &bitstream, true) == WEBP_MUX_OK; WebPDataClear(&bitstream); return ok; } static gboolean encode_webp_animation(WebPMux *mux, cairo_surface_t *page) { gboolean ok = TRUE; for (cairo_surface_t *frame = page; ok && frame; frame = cairo_surface_get_user_data(frame, &fiv_io_key_frame_next)) { WebPMuxFrameInfo info = { .bitstream = encode_lossless_webp(frame), .duration = (intptr_t) cairo_surface_get_user_data( frame, &fiv_io_key_frame_duration), .id = WEBP_CHUNK_ANMF, .dispose_method = WEBP_MUX_DISPOSE_NONE, .blend_method = WEBP_MUX_NO_BLEND, }; ok = WebPMuxPushFrame(mux, &info, true) == WEBP_MUX_OK; WebPDataClear(&info.bitstream); } WebPMuxAnimParams params = { .bgcolor = 0x00000000, // BGRA, curiously. .loop_count = (uintptr_t) cairo_surface_get_user_data(page, &fiv_io_key_loops), }; return ok && WebPMuxSetAnimationParams(mux, ¶ms) == WEBP_MUX_OK; } static gboolean set_metadata(WebPMux *mux, const char *fourcc, GBytes *data) { if (!data) return TRUE; gsize len = 0; gconstpointer p = g_bytes_get_data(data, &len); return WebPMuxSetChunk(mux, fourcc, &(WebPData) {.bytes = p, .size = len}, false) == WEBP_MUX_OK; } gboolean fiv_io_save(cairo_surface_t *page, cairo_surface_t *frame, FivIoProfile target, const char *path, GError **error) { g_return_val_if_fail(page != NULL, FALSE); g_return_val_if_fail(path != NULL, FALSE); gboolean ok = TRUE; WebPMux *mux = WebPMuxNew(); if (frame) ok = encode_webp_image(mux, frame); else if (!cairo_surface_get_user_data(page, &fiv_io_key_frame_next)) ok = encode_webp_image(mux, page); else ok = encode_webp_animation(mux, page); ok = ok && set_metadata(mux, "EXIF", cairo_surface_get_user_data(page, &fiv_io_key_exif)); ok = ok && set_metadata(mux, "ICCP", cairo_surface_get_user_data(page, &fiv_io_key_icc)); ok = ok && set_metadata(mux, "XMP ", cairo_surface_get_user_data(page, &fiv_io_key_xmp)); GBytes *iccp = NULL; if (ok && target && (iccp = fiv_io_profile_to_bytes(target))) ok = set_metadata(mux, "ICCP", iccp); WebPData assembled = {}; WebPDataInit(&assembled); if (!(ok = ok && WebPMuxAssemble(mux, &assembled) == WEBP_MUX_OK)) set_error(error, "encoding failed"); else ok = g_file_set_contents( path, (const gchar *) assembled.bytes, assembled.size, error); if (iccp) g_bytes_unref(iccp); WebPMuxDelete(mux); WebPDataClear(&assembled); return ok; } // --- Metadata ---------------------------------------------------------------- void fiv_io_orientation_dimensions(cairo_surface_t *surface, FivIoOrientation orientation, double *w, double *h) { cairo_rectangle_t extents = {}; switch (cairo_surface_get_type(surface)) { case CAIRO_SURFACE_TYPE_IMAGE: extents.width = cairo_image_surface_get_width(surface); extents.height = cairo_image_surface_get_height(surface); break; case CAIRO_SURFACE_TYPE_RECORDING: if (!cairo_recording_surface_get_extents(surface, &extents)) cairo_recording_surface_ink_extents(surface, &extents.x, &extents.y, &extents.width, &extents.height); break; default: g_assert_not_reached(); } switch (orientation) { case FivIoOrientation90: case FivIoOrientationMirror90: case FivIoOrientation270: case FivIoOrientationMirror270: *w = extents.height; *h = extents.width; break; default: *w = extents.width; *h = extents.height; } } cairo_matrix_t fiv_io_orientation_apply(cairo_surface_t *surface, FivIoOrientation orientation, double *width, double *height) { fiv_io_orientation_dimensions(surface, orientation, width, height); cairo_matrix_t matrix = {}; cairo_matrix_init_identity(&matrix); switch (orientation) { case FivIoOrientation90: cairo_matrix_rotate(&matrix, -M_PI_2); cairo_matrix_translate(&matrix, -*width, 0); break; case FivIoOrientation180: cairo_matrix_scale(&matrix, -1, -1); cairo_matrix_translate(&matrix, -*width, -*height); break; case FivIoOrientation270: cairo_matrix_rotate(&matrix, +M_PI_2); cairo_matrix_translate(&matrix, 0, -*height); break; case FivIoOrientationMirror0: cairo_matrix_scale(&matrix, -1, +1); cairo_matrix_translate(&matrix, -*width, 0); break; case FivIoOrientationMirror90: cairo_matrix_rotate(&matrix, +M_PI_2); cairo_matrix_scale(&matrix, -1, +1); cairo_matrix_translate(&matrix, -*width, -*height); break; case FivIoOrientationMirror180: cairo_matrix_scale(&matrix, +1, -1); cairo_matrix_translate(&matrix, 0, -*height); break; case FivIoOrientationMirror270: cairo_matrix_rotate(&matrix, -M_PI_2); cairo_matrix_scale(&matrix, -1, +1); default: break; } return matrix; } FivIoOrientation fiv_io_exif_orientation(const guint8 *tiff, gsize len) { // libtiff also knows how to do this, but it's not a lot of code. // The "Orientation" tag/field is part of Baseline TIFF 6.0 (1992), // it just so happens that Exif is derived from this format. // There is no other meaningful placement for this than right in IFD0, // describing the main image. const uint8_t *end = tiff + len, le[4] = {'I', 'I', 42, 0}, be[4] = {'M', 'M', 0, 42}; uint16_t (*u16)(const uint8_t *) = NULL; uint32_t (*u32)(const uint8_t *) = NULL; if (tiff + 8 > end) { return FivIoOrientationUnknown; } else if (!memcmp(tiff, le, sizeof le)) { u16 = wuffs_base__peek_u16le__no_bounds_check; u32 = wuffs_base__peek_u32le__no_bounds_check; } else if (!memcmp(tiff, be, sizeof be)) { u16 = wuffs_base__peek_u16be__no_bounds_check; u32 = wuffs_base__peek_u32be__no_bounds_check; } else { return FivIoOrientationUnknown; } const uint8_t *ifd0 = tiff + u32(tiff + 4); if (ifd0 + 2 > end) return FivIoOrientationUnknown; uint16_t fields = u16(ifd0); enum { BYTE = 1, ASCII, SHORT, LONG, RATIONAL, SBYTE, UNDEFINED, SSHORT, SLONG, SRATIONAL, FLOAT, DOUBLE }; enum { Orientation = 274 }; for (const guint8 *p = ifd0 + 2; fields-- && p + 12 <= end; p += 12) { uint16_t tag = u16(p), type = u16(p + 2), value16 = u16(p + 8); uint32_t count = u32(p + 4); if (G_UNLIKELY(tag == Orientation && type == SHORT && count == 1 && value16 >= 1 && value16 <= 8)) return value16; } return FivIoOrientationUnknown; } gboolean fiv_io_save_metadata(cairo_surface_t *page, const char *path, GError **error) { g_return_val_if_fail(page != NULL, FALSE); FILE *fp = fopen(path, "wb"); if (!fp) { g_set_error(error, G_IO_ERROR, g_io_error_from_errno(errno), "%s: %s", path, g_strerror(errno)); return FALSE; } // This does not constitute a valid JPEG codestream--it's a TEM marker // (standalone) with trailing nonsense. fprintf(fp, "\xFF\001Exiv2"); GBytes *data = NULL; gsize len = 0; gconstpointer p = NULL; // Adobe XMP Specification Part 3: Storage in Files, 2020/1, 1.1.3 // I don't care if Exiv2 supports it this way. if ((data = cairo_surface_get_user_data(page, &fiv_io_key_exif)) && (p = g_bytes_get_data(data, &len))) { while (len) { gsize chunk = MIN(len, 0xFFFF - 2 - 6); uint8_t header[10] = "\xFF\xE1\000\000Exif\000\000"; header[2] = (chunk + 2 + 6) >> 8; header[3] = (chunk + 2 + 6); fwrite(header, 1, sizeof header, fp); fwrite(p, 1, chunk, fp); len -= chunk; p += chunk; } } // https://www.color.org/specification/ICC1v43_2010-12.pdf B.4 if ((data = cairo_surface_get_user_data(page, &fiv_io_key_icc)) && (p = g_bytes_get_data(data, &len))) { gsize limit = 0xFFFF - 2 - 12; uint8_t current = 0, total = (len + limit - 1) / limit; while (len) { gsize chunk = MIN(len, limit); uint8_t header[18] = "\xFF\xE2\000\000ICC_PROFILE\000\000\000"; header[2] = (chunk + 2 + 12 + 2) >> 8; header[3] = (chunk + 2 + 12 + 2); header[16] = ++current; header[17] = total; fwrite(header, 1, sizeof header, fp); fwrite(p, 1, chunk, fp); len -= chunk; p += chunk; } } // Adobe XMP Specification Part 3: Storage in Files, 2020/1, 1.1.3 // If the main segment overflows, then it's a sign of bad luck, // because 1.1.3.1 is way too complex. if ((data = cairo_surface_get_user_data(page, &fiv_io_key_xmp)) && (p = g_bytes_get_data(data, &len))) { while (len) { gsize chunk = MIN(len, 0xFFFF - 2 - 29); uint8_t header[33] = "\xFF\xE1\000\000http://ns.adobe.com/xap/1.0/\000"; header[2] = (chunk + 2 + 29) >> 8; header[3] = (chunk + 2 + 29); fwrite(header, 1, sizeof header, fp); fwrite(p, 1, chunk, fp); break; } } fprintf(fp, "\xFF\xD9"); if (ferror(fp)) { g_set_error(error, G_IO_ERROR, g_io_error_from_errno(errno), "%s: %s", path, g_strerror(errno)); fclose(fp); return FALSE; } if (fclose(fp)) { g_set_error(error, G_IO_ERROR, g_io_error_from_errno(errno), "%s: %s", path, g_strerror(errno)); return FALSE; } return TRUE; }