1 files changed, 82 insertions, 0 deletions
diff --git a/src/loader/backends/avif.c b/src/loader/backends/avif.c
new file mode 100644
index 0000000..112d52d
--- /dev/null
+++ b/src/loader/backends/avif.c
@@ -0,0 +1,82 @@
+/*:*
+ * 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,
+};
+\ No newline at end of file