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Diffstat (limited to 'src/loader/loader.c')
| -rw-r--r-- | src/loader/loader.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/loader/loader.c b/src/loader/loader.c new file mode 100644 index 0000000..b1c4851 --- /dev/null +++ b/src/loader/loader.c @@ -0,0 +1,67 @@ +/*:* + * 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); +}
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