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/*:*
* ggaze — image loader dispatcher
*
* Reads a short header, sniffs the format, and hands off to the first backend
* whose can_load() accepts it. BACKENDS[] is ordered so format-specific
* backends (JXL/AVIF/HEIF, M5) win over the GdkPixbuf fallback, which is last
* and accepts GGAZE_FMT_UNKNOWN. M1 ships only the pixbuf backend.
*
* Copyright (c) 2026 ggaze contributors
* SPDX-License-Identifier: GPL-3.0-or-later
*:*/
#include "loader.h"
#include <gio/gio.h>
#include <glib.h>
#include "detect.h"
/* Registered backends, priority order (specific first, fallback LAST).
* pixbuf_backend must remain last: it accepts GGAZE_FMT_UNKNOWN. */
static const GgazeLoaderBackend *BACKENDS[] = {
/* jxl_backend, avif_backend, heif_backend land here in M5. */
&pixbuf_backend,
};
#define GGAZE_SNIFF_LEN 64
static gsize
_read_header(GFile *p_file, GCancellable *p_cancel, guint8 *p_head, gsize u_max,
GError **p_err) {
GError *p_sub = NULL;
GFileInputStream *p_in = g_file_read(p_file, p_cancel, &p_sub);
if (p_in == NULL) {
g_propagate_error(p_err, p_sub);
return (0);
}
gssize n = g_input_stream_read(G_INPUT_STREAM(p_in), p_head, u_max, p_cancel,
&p_sub);
g_object_unref(p_in);
if (n < 0) {
g_propagate_error(p_err, p_sub);
return (0);
}
return ((gsize)n);
}
GdkTexture *
loader_load(GFile *p_file, GCancellable *p_cancel, GError **p_err) {
g_return_val_if_fail(G_IS_FILE(p_file), NULL);
guint8 head[GGAZE_SNIFF_LEN];
gsize u_read = _read_header(p_file, p_cancel, head, GGAZE_SNIFF_LEN, p_err);
if (u_read == 0 && p_err != NULL && *p_err != NULL) {
return (NULL);
}
for (gsize u_i = 0; u_i < G_N_ELEMENTS(BACKENDS); u_i++) {
if (BACKENDS[u_i]->can_load(head, u_read)) {
return (BACKENDS[u_i]->load(p_file, p_cancel, p_err));
}
}
g_set_error(p_err, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
"unsupported or unrecognized image format");
return (NULL);
}
/* --- async wrapper (M3) -------------------------------------------------- */
static void
_load_task_thread(GTask *p_task, gpointer p_src, gpointer p_task_data,
GCancellable *p_cancel) {
(void)p_task_data;
GError *p_err = NULL;
GdkTexture *p_tex = loader_load((GFile *)p_src, p_cancel, &p_err);
if (p_tex == NULL) {
g_task_return_error(p_task, p_err);
} else {
g_task_return_pointer(p_task, p_tex, (GDestroyNotify)g_object_unref);
}
}
void
loader_load_async(GFile *p_file, GCancellable *p_cancel,
GAsyncReadyCallback p_cb, gpointer p_data) {
g_return_if_fail(G_IS_FILE(p_file));
GTask *p_task = g_task_new(p_file, p_cancel, p_cb, p_data);
g_task_run_in_thread(p_task, _load_task_thread);
g_object_unref(p_task);
}
GdkTexture *
loader_load_finish(GAsyncResult *p_res, GError **p_err) {
g_return_val_if_fail(G_IS_TASK(p_res), NULL);
return ((GdkTexture *)g_task_propagate_pointer((GTask *)p_res, p_err));
}
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