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#include "backend.h"
#include "bitmap.h"
#include "image.h"
#include "log.h"
#include "source.h"
#include "source_private.h"
#include <fcntl.h>
#include <libnsgif.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
struct private {
int current_frame;
gif_animation gif;
void *data;
size_t len;
};
static void* bitmap_create(int width, int height)
{
const size_t bytes_per_pixel = 4;
return calloc(width * height, bytes_per_pixel);
}
static void bitmap_destroy(void *bitmap)
{
free(bitmap);
}
static unsigned char* bitmap_get_buffer(void *bitmap)
{
return bitmap;
}
static void bitmap_set_opaque(void *bitmap, bool opaque)
{
(void)bitmap;
(void)opaque;
}
static bool bitmap_test_opaque(void *bitmap)
{
(void)bitmap;
return false;
}
static void bitmap_mark_modified(void *bitmap)
{
(void)bitmap;
}
static gif_bitmap_callback_vt bitmap_callbacks = {
bitmap_create,
bitmap_destroy,
bitmap_get_buffer,
bitmap_set_opaque,
bitmap_test_opaque,
bitmap_mark_modified
};
static void free_private(void *raw_private)
{
if (!raw_private) {
return;
}
struct private *private = raw_private;
gif_finalise(&private->gif);
munmap(private->data, private->len);
free(private);
}
static void push_current_image(struct private *private,
struct imv_image **image, int *frametime)
{
struct imv_bitmap *bmp = malloc(sizeof *bmp);
bmp->width = private->gif.width;
bmp->height = private->gif.height;
bmp->format = IMV_ABGR;
size_t len = 4 * bmp->width * bmp->height;
bmp->data = malloc(len);
memcpy(bmp->data, private->gif.frame_image, len);
*image = imv_image_create_from_bitmap(bmp);
*frametime = private->gif.frames[private->current_frame].frame_delay * 10.0;
}
static void first_frame(void *raw_private, struct imv_image **image, int *frametime)
{
*image = NULL;
*frametime = 0;
struct private *private = raw_private;
private->current_frame = 0;
gif_result code = gif_decode_frame(&private->gif, private->current_frame);
if (code != GIF_OK) {
imv_log(IMV_DEBUG, "libnsgif: failed to decode first frame\n");
return;
}
push_current_image(private, image, frametime);
}
static void next_frame(void *raw_private, struct imv_image **image, int *frametime)
{
*image = NULL;
*frametime = 0;
struct private *private = raw_private;
private->current_frame++;
private->current_frame %= private->gif.frame_count;
gif_result code = gif_decode_frame(&private->gif, private->current_frame);
if (code != GIF_OK) {
imv_log(IMV_DEBUG, "libnsgif: failed to decode a frame\n");
return;
}
push_current_image(private, image, frametime);
}
static const struct imv_source_vtable vtable = {
.load_first_frame = first_frame,
.load_next_frame = next_frame,
.free = free_private
};
static enum backend_result open_memory(void *data, size_t len, struct imv_source **src)
{
struct private *private = calloc(1, sizeof *private);
gif_create(&private->gif, &bitmap_callbacks);
gif_result code;
do {
code = gif_initialise(&private->gif, len, data);
} while (code == GIF_WORKING);
if (code != GIF_OK) {
gif_finalise(&private->gif);
free(private);
imv_log(IMV_DEBUG, "libsngif: unsupported file\n");
return BACKEND_UNSUPPORTED;
}
*src = imv_source_create(&vtable, private);
return BACKEND_SUCCESS;
}
static enum backend_result open_path(const char *path, struct imv_source **src)
{
imv_log(IMV_DEBUG, "libnsgif: open_path(%s)\n", path);
int fd = open(path, O_RDONLY);
if (fd < 0) {
return BACKEND_BAD_PATH;
}
off_t len = lseek(fd, 0, SEEK_END);
if (len < 0) {
close(fd);
return BACKEND_BAD_PATH;
}
void *data = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
if (data == MAP_FAILED || !data) {
return BACKEND_BAD_PATH;
}
struct private *private = calloc(1, sizeof *private);
private->data = data;
private->len = len;
gif_create(&private->gif, &bitmap_callbacks);
gif_result code;
do {
code = gif_initialise(&private->gif, private->len, private->data);
} while (code == GIF_WORKING);
if (code != GIF_OK) {
gif_finalise(&private->gif);
munmap(private->data, private->len);
free(private);
imv_log(IMV_DEBUG, "libsngif: unsupported file\n");
return BACKEND_UNSUPPORTED;
}
imv_log(IMV_DEBUG, "libnsgif: num_frames=%d\n", private->gif.frame_count);
imv_log(IMV_DEBUG, "libnsgif: width=%d\n", private->gif.width);
imv_log(IMV_DEBUG, "libnsgif: height=%d\n", private->gif.height);
*src = imv_source_create(&vtable, private);
return BACKEND_SUCCESS;
}
const struct imv_backend imv_backend_libnsgif = {
.name = "libnsgif",
.description = "Tiny GIF decoding library from the NetSurf project",
.website = "https://www.netsurf-browser.org/projects/libnsgif/",
.license = "MIT",
.open_path = &open_path,
.open_memory = &open_memory,
};
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