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/*:*
* ggaze — AVIF loader backend (libavif)
*
* Decodes AVIF via libavif. Compiled only when meson feature `avif` is enabled.
* If libavif is absent, the heif backend (libheif) also handles AVIF (its
* can_load accepts GGAZE_FMT_AVIF). This backend is preferred when present.
*
* Copyright (c) 2026 ggaze contributors
* SPDX-License-Identifier: GPL-3.0-or-later
*:*/
#include "../loader.h"
#include "../detect.h"
#include <avif/avif.h>
#include <gdk/gdk.h>
#include <gio/gio.h>
static gboolean
_avif_can_load(const guint8 *p_head, gsize u_len) {
return (detect_format(p_head, u_len) == GGAZE_FMT_AVIF);
}
static GdkTexture *
_avif_load(GFile *p_file, GCancellable *p_cancel, GError **p_err) {
(void)p_cancel;
char *c_path = g_file_get_path(p_file);
if (c_path == NULL) {
g_set_error(p_err, G_IO_ERROR, G_IO_ERROR_FAILED, "avif: non-local file");
return (NULL);
}
avifDecoder *p_dec = avifDecoderCreate();
avifResult e_r = avifDecoderSetIOFile(p_dec, c_path);
g_free(c_path);
if (e_r != AVIF_RESULT_OK) {
g_set_error(p_err, G_IO_ERROR, G_IO_ERROR_FAILED, "avif: %s",
avifResultToString(e_r));
avifDecoderDestroy(p_dec);
return (NULL);
}
e_r = avifDecoderParse(p_dec);
if (e_r != AVIF_RESULT_OK) {
g_set_error(p_err, G_IO_ERROR, G_IO_ERROR_FAILED, "avif: %s",
avifResultToString(e_r));
avifDecoderDestroy(p_dec);
return (NULL);
}
e_r = avifDecoderNextImage(p_dec);
if (e_r != AVIF_RESULT_OK) {
g_set_error(p_err, G_IO_ERROR, G_IO_ERROR_FAILED, "avif: %s",
avifResultToString(e_r));
avifDecoderDestroy(p_dec);
return (NULL);
}
avifRGBImage st_rgb;
avifRGBImageSetDefaults(&st_rgb, &p_dec->image);
st_rgb.format = AVIF_RGB_FORMAT_RGBA;
st_rgb.depth = 8;
avifRGBImageAllocatePixels(&st_rgb);
avifImageYCToRGB(&p_dec->image, &st_rgb);
GdkTexture *p_tex = NULL;
if (st_rgb.pixels != NULL) {
GBytes *p_bytes = g_bytes_new_static(
st_rgb.pixels, (gsize)st_rgb.rowBytes * (gsize)st_rgb.height);
p_tex = gdk_memory_texture_new((int)st_rgb.width, (int)st_rgb.height,
GDK_MEMORY_R8G8B8A8, p_bytes,
(gsize)st_rgb.rowBytes);
g_bytes_unref(p_bytes);
}
avifRGBImageFreePixels(&st_rgb);
avifDecoderDestroy(p_dec);
return (p_tex);
}
const GgazeLoaderBackend avif_backend = {
.can_load = _avif_can_load,
.load = _avif_load,
};
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