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-rw-r--r--fastiv-io.c235
-rw-r--r--fastiv-io.h13
-rw-r--r--fastiv-view.c86
-rw-r--r--meson.build4
4 files changed, 335 insertions, 3 deletions
diff --git a/fastiv-io.c b/fastiv-io.c
index f99c385..67041d3 100644
--- a/fastiv-io.c
+++ b/fastiv-io.c
@@ -1,5 +1,5 @@
//
-// fastiv-io.c: image loaders
+// fastiv-io.c: image operations
//
// Copyright (c) 2021, Přemysl Eric Janouch <p@janouch.name>
//
@@ -36,6 +36,8 @@
#ifdef HAVE_LIBWEBP
#include <webp/decode.h>
#include <webp/demux.h>
+#include <webp/encode.h>
+#include <webp/mux.h>
#endif // HAVE_LIBWEBP
#ifdef HAVE_LIBHEIF
#include <libheif/heif.h>
@@ -129,7 +131,7 @@ fastiv_io_all_supported_media_types(void)
G_DEFINE_QUARK(fastiv-io-error-quark, fastiv_io_error)
enum FastivIoError {
- FASTIV_IO_ERROR_OPEN,
+ FASTIV_IO_ERROR_OPEN
};
static void
@@ -1934,6 +1936,7 @@ fastiv_io_open_from_data(const char *data, size_t len, const gchar *path,
// 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;
@@ -1947,6 +1950,159 @@ fastiv_io_open_from_data(const char *data, size_t len, const gchar *path,
return surface;
}
+// --- Export ------------------------------------------------------------------
+#ifdef HAVE_LIBWEBP
+
+static WebPData
+encode_lossless_webp(cairo_surface_t *surface)
+{
+ 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);
+ }
+
+ WebPConfig config = {};
+ WebPPicture picture = {};
+ if (!WebPConfigInit(&config) ||
+ !WebPConfigLosslessPreset(&config, 6) ||
+ !WebPPictureInit(&picture))
+ goto fail;
+
+ config.thread_level = true;
+ if (!WebPValidateConfig(&config))
+ 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;
+
+ WebPMemoryWriter writer = {};
+ WebPMemoryWriterInit(&writer);
+ 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);
+ return (WebPData) {.bytes = writer.mem, .size = writer.size};
+}
+
+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, &fastiv_io_key_frame_next)) {
+ WebPMuxFrameInfo info = {
+ .bitstream = encode_lossless_webp(frame),
+ .duration = (intptr_t) cairo_surface_get_user_data(
+ frame, &fastiv_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, &fastiv_io_key_loops),
+ };
+ return ok && WebPMuxSetAnimationParams(mux, &params) == WEBP_MUX_OK;
+}
+
+static gboolean
+transfer_metadata(WebPMux *mux, const char *fourcc, cairo_surface_t *page,
+ const cairo_user_data_key_t *kind)
+{
+ GBytes *data = cairo_surface_get_user_data(page, kind);
+ 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
+fastiv_io_save(cairo_surface_t *page, cairo_surface_t *frame, const gchar *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, &fastiv_io_key_frame_next))
+ ok = encode_webp_image(mux, page);
+ else
+ ok = encode_webp_animation(mux, page);
+
+ ok = ok && transfer_metadata(mux, "EXIF", page, &fastiv_io_key_exif);
+ ok = ok && transfer_metadata(mux, "ICCP", page, &fastiv_io_key_icc);
+
+ 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);
+
+ WebPMuxDelete(mux);
+ WebPDataClear(&assembled);
+ return ok;
+}
+
+#endif // HAVE_LIBWEBP
// --- Metadata ----------------------------------------------------------------
FastivIoOrientation
@@ -1993,6 +2149,81 @@ fastiv_io_exif_orientation(const guint8 *tiff, gsize len)
return FastivIoOrientationUnknown;
}
+gboolean
+fastiv_io_save_metadata(
+ cairo_surface_t *page, const gchar *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, &fastiv_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, &fastiv_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;
+ }
+ }
+
+ 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;
+}
+
// --- Thumbnails --------------------------------------------------------------
GType
diff --git a/fastiv-io.h b/fastiv-io.h
index c8a256b..a581ea8 100644
--- a/fastiv-io.h
+++ b/fastiv-io.h
@@ -1,5 +1,5 @@
//
-// fastiv-io.h: image loaders
+// fastiv-io.h: image operations
//
// Copyright (c) 2021, Přemysl Eric Janouch <p@janouch.name>
//
@@ -59,6 +59,13 @@ cairo_surface_t *fastiv_io_open_from_data(
int fastiv_io_filecmp(GFile *f1, GFile *f2);
+// --- Export ------------------------------------------------------------------
+
+/// Requires libwebp.
+/// If no exact frame is specified, this potentially creates an animation.
+gboolean fastiv_io_save(cairo_surface_t *page, cairo_surface_t *frame,
+ const gchar *path, GError **error);
+
// --- Metadata ----------------------------------------------------------------
// https://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf Table 6
@@ -76,6 +83,10 @@ typedef enum _FastivIoOrientation {
FastivIoOrientation fastiv_io_exif_orientation(const guint8 *exif, gsize len);
+/// Save metadata attached by this module in Exiv2 format.
+gboolean fastiv_io_save_metadata(
+ cairo_surface_t *page, const gchar *path, GError **error);
+
// --- Thumbnails --------------------------------------------------------------
// And this is how you avoid glib-mkenums.
diff --git a/fastiv-view.c b/fastiv-view.c
index db11ae1..3aefefd 100644
--- a/fastiv-view.c
+++ b/fastiv-view.c
@@ -15,6 +15,8 @@
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
+#include "config.h"
+
#include <math.h>
#include <stdbool.h>
@@ -549,6 +551,86 @@ fastiv_view_unmap(GtkWidget *widget)
GTK_WIDGET_CLASS(fastiv_view_parent_class)->unmap(widget);
}
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+show_error_dialog(GtkWindow *parent, GError *error)
+{
+ GtkWidget *dialog = gtk_message_dialog_new(parent, GTK_DIALOG_MODAL,
+ GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "%s", error->message);
+ gtk_dialog_run(GTK_DIALOG(dialog));
+ gtk_widget_destroy(dialog);
+ g_error_free(error);
+}
+
+static gboolean
+save_as(FastivView *self, gboolean frame)
+{
+ GtkWindow *window = NULL;
+ GtkWidget *widget = NULL;
+ if (GTK_IS_WINDOW((widget = gtk_widget_get_toplevel(GTK_WIDGET(self)))))
+ window = GTK_WINDOW(widget);
+
+ GtkWidget *dialog =
+ gtk_file_chooser_dialog_new(frame ? "Save frame as" : "Save page as",
+ window, GTK_FILE_CHOOSER_ACTION_SAVE,
+ "_Cancel", GTK_RESPONSE_CANCEL, "_Save", GTK_RESPONSE_ACCEPT, NULL);
+ GtkFileChooser *chooser = GTK_FILE_CHOOSER(dialog);
+
+ // TODO(p): Consider a hard dependency on libwebp, or clean this up.
+#ifdef HAVE_LIBWEBP
+ // This is the best general format: supports lossless encoding, animations,
+ // alpha channel, and Exif and ICC profile metadata.
+ // PNG is another viable option, but sPNG can't do APNG, Wuffs can't save,
+ // and libpng is a pain in the arse.
+ GtkFileFilter *webp_filter = gtk_file_filter_new();
+ gtk_file_filter_add_mime_type(webp_filter, "image/webp");
+ gtk_file_filter_add_pattern(webp_filter, "*.webp");
+ gtk_file_filter_set_name(webp_filter, "Lossless WebP");
+ gtk_file_chooser_add_filter(chooser, webp_filter);
+
+ // TODO(p): Derive it from the currently displayed filename,
+ // and set the directory to the same place.
+ gtk_file_chooser_set_current_name(
+ chooser, frame ? "frame.webp" : "page.webp");
+#endif // HAVE_LIBWEBP
+
+ // The format is supported by Exiv2 and ExifTool.
+ // This is mostly a developer tool.
+ GtkFileFilter *exv_filter = gtk_file_filter_new();
+ gtk_file_filter_add_mime_type(exv_filter, "image/x-exv");
+ gtk_file_filter_add_pattern(exv_filter, "*.exv");
+ gtk_file_filter_set_name(exv_filter, "Exiv2 metadata");
+ gtk_file_chooser_add_filter(chooser, exv_filter);
+
+ switch (gtk_dialog_run(GTK_DIALOG(dialog))) {
+ gchar *path;
+ case GTK_RESPONSE_ACCEPT:
+ path = gtk_file_chooser_get_filename(chooser);
+
+ GError *error = NULL;
+#ifdef HAVE_LIBWEBP
+ if (gtk_file_chooser_get_filter(chooser) == webp_filter)
+ fastiv_io_save(self->page,
+ frame ? self->frame : NULL, path, &error);
+ else
+#endif // HAVE_LIBWEBP
+ fastiv_io_save_metadata(self->page, path, &error);
+ if (error)
+ show_error_dialog(window, error);
+ g_free(path);
+
+ // Fall-through.
+ default:
+ gtk_widget_destroy(dialog);
+ // Fall-through.
+ case GTK_RESPONSE_NONE:
+ return TRUE;
+ }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
static gboolean
fastiv_view_key_press_event(GtkWidget *widget, GdkEventKey *event)
{
@@ -569,6 +651,10 @@ fastiv_view_key_press_event(GtkWidget *widget, GdkEventKey *event)
return set_scale(self, self->scale * SCALE_STEP);
case GDK_KEY_minus:
return set_scale(self, self->scale / SCALE_STEP);
+ case GDK_KEY_s:
+ return save_as(self, FALSE);
+ case GDK_KEY_S:
+ return save_as(self, TRUE);
}
}
if (state != 0)
diff --git a/meson.build b/meson.build
index 7b8cb20..2bf6d79 100644
--- a/meson.build
+++ b/meson.build
@@ -20,6 +20,8 @@ xcursor = dependency('xcursor', required : get_option('xcursor'))
libwebp = dependency('libwebp', required : get_option('libwebp'))
libwebpdemux = dependency('libwebpdemux', required : get_option('libwebp'))
libwebpdecoder = dependency('libwebpdecoder', required : get_option('libwebp'))
+libwebpmux = dependency('libwebpmux', required : get_option('libwebp'))
+libwebpencoder = dependency('libwebpencoder', required : get_option('libwebp'))
libheif = dependency('libheif', required : get_option('libheif'))
libtiff = dependency('libtiff-4', required : get_option('libtiff'))
gdkpixbuf = dependency('gdk-pixbuf-2.0', required : get_option('gdk-pixbuf'))
@@ -35,6 +37,8 @@ dependencies = [
libwebp,
libwebpdemux,
libwebpdecoder,
+ libwebpmux,
+ libwebpencoder,
libheif,
libtiff,
gdkpixbuf,
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-23 02:59:02 +0000