Prepare for parallelized colour management

This rewrite is more or less necessary for:
 - colour-managed browser thumbnails,
 - asynchronous image loading,
 - turning fiv-io into a reusable library.

Little CMS has a fairly terrible API in this regard.

1 files changed, 0 insertions, 375 deletions

diff --git a/fiv-io-profile.c b/fiv-io-profile.c
deleted file mode 100644
index 2c6f345..0000000
--- a/fiv-io-profile.c
+++ /dev/null
@@ -1,375 +0,0 @@
-//
-// fiv-profile.c: colour management
-//
-// Copyright (c) 2024, Přemysl Eric Janouch <p@janouch.name>
-//
-// 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 <glib.h>
-#include <stdbool.h>
-
-#include "fiv-io.h"
-
-// Colour management must be handled before RGB conversions.
-#ifdef HAVE_LCMS2
-#include <lcms2.h>
-#endif  // HAVE_LCMS2
-#ifdef HAVE_LCMS2_FAST_FLOAT
-#include <lcms2_fast_float.h>
-#endif  // HAVE_LCMS2_FAST_FLOAT
-
-// https://github.com/mm2/Little-CMS/issues/430
-static bool g_broken_cms_premul;
-
-void
-fiv_io_profile_init(void)
-{
-	// TODO(p): Use Little CMS with contexts instead.
-#ifdef HAVE_LCMS2_FAST_FLOAT
-	if (cmsPluginTHR(NULL, cmsFastFloatExtensions()))
-		g_broken_cms_premul = LCMS_VERSION <= 2160;
-#endif  // HAVE_LCMS2_FAST_FLOAT
-}
-
-FivIoProfile *
-fiv_io_profile_new(const void *data, size_t len)
-{
-#ifdef HAVE_LCMS2
-	return cmsOpenProfileFromMemTHR(NULL, data, len);
-#else
-	(void) data;
-	(void) len;
-	return NULL;
-#endif
-}
-
-FivIoProfile *
-fiv_io_profile_new_sRGB(void)
-{
-#ifdef HAVE_LCMS2
-	return cmsCreate_sRGBProfileTHR(NULL);
-#else
-	return NULL;
-#endif
-}
-
-FivIoProfile *
-fiv_io_profile_new_parametric(
-	double gamma, double whitepoint[2], double primaries[6])
-{
-#ifdef HAVE_LCMS2
-	// TODO(p): Make sure to use the library in a thread-safe manner.
-	cmsContext context = NULL;
-
-	const cmsCIExyY cmsWP = {whitepoint[0], whitepoint[1], 1.0};
-	const cmsCIExyYTRIPLE cmsP = {
-		{primaries[0], primaries[1], 1.0},
-		{primaries[2], primaries[3], 1.0},
-		{primaries[4], primaries[5], 1.0},
-	};
-
-	cmsToneCurve *curve = cmsBuildGamma(context, gamma);
-	if (!curve)
-		return NULL;
-
-	cmsHPROFILE profile = cmsCreateRGBProfileTHR(
-		context, &cmsWP, &cmsP, (cmsToneCurve *[3]){curve, curve, curve});
-	cmsFreeToneCurve(curve);
-	return profile;
-#else
-	(void) gamma;
-	(void) whitepoint;
-	(void) primaries;
-	return NULL;
-#endif
-}
-
-FivIoProfile *
-fiv_io_profile_new_sRGB_gamma(double gamma)
-{
-	return fiv_io_profile_new_parametric(gamma,
-		(double[2]){0.3127, 0.3290},
-		(double[6]){0.6400, 0.3300, 0.3000, 0.6000, 0.1500, 0.0600});
-}
-
-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);
-}
-
-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
-}
-
-// --- Image loading -----------------------------------------------------------
-
-// TODO(p): In general, try to use CAIRO_FORMAT_RGB30 or CAIRO_FORMAT_RGBA128F.
-#ifndef HAVE_LCMS2
-#define FIV_IO_PROFILE_ARGB32 0
-#define FIV_IO_PROFILE_4X16LE 0
-#else
-#define FIV_IO_PROFILE_ARGB32 \
-	(G_BYTE_ORDER == G_LITTLE_ENDIAN ? TYPE_BGRA_8 : TYPE_ARGB_8)
-#define FIV_IO_PROFILE_4X16LE \
-	(G_BYTE_ORDER == G_LITTLE_ENDIAN ? TYPE_BGRA_16 : TYPE_BGRA_16_SE)
-#endif
-
-// 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;
-	}
-}
-
-void
-fiv_io_profile_cmyk(
-	FivIoImage *image, FivIoProfile *source, FivIoProfile *target)
-{
-#ifndef HAVE_LCMS2
-	(void) source;
-	(void) target;
-#else
-	cmsHTRANSFORM transform = NULL;
-	if (source && target) {
-		transform = cmsCreateTransformTHR(NULL, source, TYPE_CMYK_8_REV, target,
-			FIV_IO_PROFILE_ARGB32, INTENT_PERCEPTUAL, 0);
-	}
-	if (transform) {
-		cmsDoTransform(
-			transform, image->data, image->data, image->width * image->height);
-		cmsDeleteTransform(transform);
-		return;
-	}
-#endif
-	trivial_cmyk_to_host_byte_order_argb(
-		image->data, image->width * image->height);
-}
-
-static bool
-fiv_io_profile_rgb_direct(unsigned char *data, int w, int h,
-	FivIoProfile *source, FivIoProfile *target,
-	uint32_t source_format, uint32_t target_format)
-{
-#ifndef HAVE_LCMS2
-	(void) data;
-	(void) w;
-	(void) h;
-	(void) source;
-	(void) source_format;
-	(void) target;
-	(void) target_format;
-	return false;
-#else
-	// TODO(p): We should make this optional.
-	cmsHPROFILE src_fallback = NULL;
-	if (target && !source)
-		source = src_fallback = cmsCreate_sRGBProfileTHR(NULL);
-
-	cmsHTRANSFORM transform = NULL;
-	if (source && target) {
-		transform = cmsCreateTransformTHR(NULL,
-			source, source_format, target, target_format, INTENT_PERCEPTUAL, 0);
-	}
-	if (transform) {
-		cmsDoTransform(transform, data, data, w * h);
-		cmsDeleteTransform(transform);
-	}
-	if (src_fallback)
-		cmsCloseProfile(src_fallback);
-	return transform != NULL;
-#endif
-}
-
-static void
-fiv_io_profile_xrgb32(
-	FivIoImage *image, FivIoProfile *source, FivIoProfile *target)
-{
-	fiv_io_profile_rgb_direct(image->data, image->width, image->height,
-		source, target, FIV_IO_PROFILE_ARGB32, FIV_IO_PROFILE_ARGB32);
-}
-
-void
-fiv_io_profile_4x16le_direct(unsigned char *data,
-	int w, int h, FivIoProfile *source, FivIoProfile *target)
-{
-	fiv_io_profile_rgb_direct(data, w, h, source, target,
-		FIV_IO_PROFILE_4X16LE, FIV_IO_PROFILE_4X16LE);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-void
-fiv_io_profile_page(FivIoImage *page, FivIoProfile *target,
-	void (*frame_cb) (FivIoImage *, FivIoProfile *, FivIoProfile *))
-{
-	FivIoProfile *source = NULL;
-	if (page->icc)
-		source = fiv_io_profile_new_from_bytes(page->icc);
-
-	// TODO(p): All animations need to be composited in a linear colour space.
-	for (FivIoImage *frame = page; frame != NULL; frame = frame->frame_next)
-		frame_cb(frame, source, target);
-
-	if (source)
-		fiv_io_profile_free(source);
-}
-
-// From libwebp, verified to exactly match [x * a / 255].
-#define PREMULTIPLY8(a, x) (((uint32_t) (x) * (uint32_t) (a) * 32897U) >> 23)
-
-void
-fiv_io_premultiply_argb32(FivIoImage *image)
-{
-	if (image->format != CAIRO_FORMAT_ARGB32)
-		return;
-
-	for (uint32_t y = 0; y < image->height; y++) {
-		uint32_t *dstp = (uint32_t *) (image->data + image->stride * y);
-		for (uint32_t x = 0; x < image->width; 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);
-		}
-	}
-}
-
-#if defined HAVE_LCMS2 && LCMS_VERSION >= 2130
-
-#define FIV_IO_PROFILE_ARGB32_PREMUL \
-	(G_BYTE_ORDER == G_LITTLE_ENDIAN ? TYPE_BGRA_8_PREMUL : TYPE_ARGB_8_PREMUL)
-
-static void
-fiv_io_profile_argb32(FivIoImage *image,
-	FivIoProfile *source, FivIoProfile *target)
-{
-	g_return_if_fail(image->format == CAIRO_FORMAT_ARGB32);
-
-	// TODO: With g_no_cms_premultiplication,
-	// this probably also needs to be wrapped in un-premultiplication.
-	fiv_io_profile_rgb_direct(image->data, image->width, image->height,
-		source, target,
-		FIV_IO_PROFILE_ARGB32_PREMUL, FIV_IO_PROFILE_ARGB32_PREMUL);
-}
-
-void
-fiv_io_profile_argb32_premultiply(
-	FivIoImage *image, FivIoProfile *source, FivIoProfile *target)
-{
-	if (image->format != CAIRO_FORMAT_ARGB32) {
-		fiv_io_profile_xrgb32(image, source, target);
-	} else if (g_broken_cms_premul) {
-		fiv_io_profile_xrgb32(image, source, target);
-		fiv_io_premultiply_argb32(image);
-	} else if (!fiv_io_profile_rgb_direct(image->data,
-			image->width, image->height, source, target,
-			FIV_IO_PROFILE_ARGB32, FIV_IO_PROFILE_ARGB32_PREMUL)) {
-		g_debug("failed to create a premultiplying transform");
-		fiv_io_premultiply_argb32(image);
-	}
-}
-
-#else  // ! HAVE_LCMS2 || LCMS_VERSION < 2130
-
-// TODO(p): Unpremultiply, transform, repremultiply. Or require lcms2>=2.13.
-#define fiv_io_profile_argb32(surface, source, target)
-
-static void
-fiv_io_profile_argb32_premultiply(
-	FivIoImage *image, FivIoProfile *source, FivIoProfile *target)
-{
-	fiv_io_profile_xrgb32(image, source, target);
-	fiv_io_premultiply_argb32(image);
-}
-
-#endif  // ! HAVE_LCMS2 || LCMS_VERSION < 2130
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-void
-fiv_io_profile_any(
-	FivIoImage *image, FivIoProfile *source, FivIoProfile *target)
-{
-	// TODO(p): Ensure we do colour management early enough, so that
-	// no avoidable increase of quantization error occurs beforehands,
-	// and also for correct alpha compositing.
-	switch (image->format) {
-	break; case CAIRO_FORMAT_RGB24:
-		fiv_io_profile_xrgb32(image, source, target);
-	break; case CAIRO_FORMAT_ARGB32:
-		fiv_io_profile_argb32(image, source, target);
-	break; default:
-		g_debug("CM attempted on an unsupported surface format");
-	}
-}
-
-// TODO(p): Offer better integration, upgrade the bit depth if appropriate.
-FivIoImage *
-fiv_io_profile_finalize(FivIoImage *image, FivIoProfile *target)
-{
-	if (!target)
-		return image;
-
-	for (FivIoImage *page = image; page != NULL; page = page->page_next)
-		fiv_io_profile_page(page, target, fiv_io_profile_any);
-	return image;
-}