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#include "backend.h"
#include "source.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <librsvg/rsvg.h>
/* Some systems like GNU/Hurd don't define PATH_MAX */
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
struct private {
void *data;
size_t len;
};
static void source_free(struct imv_source *src)
{
pthread_mutex_lock(&src->busy);
free(src->name);
src->name = NULL;
struct private *private = src->private;
free(private);
src->private = NULL;
pthread_mutex_unlock(&src->busy);
pthread_mutex_destroy(&src->busy);
free(src);
}
static void report_error(struct imv_source *src)
{
assert(src->callback);
struct imv_source_message msg;
msg.source = src;
msg.user_data = src->user_data;
msg.image = NULL;
msg.error = "Internal error";
pthread_mutex_unlock(&src->busy);
src->callback(&msg);
}
static void send_svg(struct imv_source *src, RsvgHandle *handle)
{
assert(src->callback);
struct imv_source_message msg;
msg.source = src;
msg.user_data = src->user_data;
msg.image = imv_image_create_from_svg(handle);
msg.frametime = 0;
msg.error = NULL;
pthread_mutex_unlock(&src->busy);
src->callback(&msg);
}
static void *load_image(struct imv_source *src)
{
/* Don't run if this source is already active */
if (pthread_mutex_trylock(&src->busy)) {
return NULL;
}
RsvgHandle *handle = NULL;
GError *error = NULL;
struct private *private = src->private;
if (private->data) {
handle = rsvg_handle_new_from_data(private->data, private->len, &error);
} else {
char path[PATH_MAX+8];
snprintf(path, sizeof path, "file://%s", src->name);
handle = rsvg_handle_new_from_file(path, &error);
}
if (!handle) {
report_error(src);
return NULL;
}
RsvgDimensionData dim;
rsvg_handle_get_dimensions(handle, &dim);
src->width = dim.width;
src->height = dim.height;
send_svg(src, handle);
return NULL;
}
static enum backend_result open_path(const char *path, struct imv_source **src)
{
/* Look for an <SVG> tag near the start of the file */
char header[4096];
FILE *f = fopen(path, "rb");
if (!f) {
return BACKEND_BAD_PATH;
}
fread(header, 1, sizeof header, f);
fclose(f);
header[(sizeof header) - 1] = 0;
if (!strstr(header, "<SVG") && !strstr(header, "<svg")) {
return BACKEND_UNSUPPORTED;
}
struct private *private = malloc(sizeof *private);
private->data = NULL;
private->len = 0;
struct imv_source *source = calloc(1, sizeof *source);
source->name = strdup(path);
source->width = 1024;
source->height = 1024;
source->num_frames = 1;
source->next_frame = 1;
pthread_mutex_init(&source->busy, NULL);
source->load_first_frame = &load_image;
source->load_next_frame = NULL;
source->free = &source_free;
source->callback = NULL;
source->user_data = NULL;
source->private = private;
*src = source;
return BACKEND_SUCCESS;
}
static enum backend_result open_memory(void *data, size_t len, struct imv_source **src)
{
/* Look for an <SVG> tag near the start of the file */
char header[4096];
size_t header_len = sizeof header;
if (header_len > len) {
header_len = len;
}
memcpy(header, data, header_len);
header[header_len - 1] = 0;
if (!strstr(header, "<SVG") && !strstr(header, "<svg")) {
return BACKEND_UNSUPPORTED;
}
struct private *private = malloc(sizeof *private);
private->data = data;
private->len = len;
struct imv_source *source = calloc(1, sizeof *source);
source->name = strdup("-");
source->width = 1024;
source->height = 1024;
source->num_frames = 1;
source->next_frame = 1;
pthread_mutex_init(&source->busy, NULL);
source->load_first_frame = &load_image;
source->load_next_frame = NULL;
source->free = &source_free;
source->callback = NULL;
source->user_data = NULL;
source->private = private;
*src = source;
return BACKEND_SUCCESS;
}
const struct imv_backend imv_backend_librsvg = {
.name = "libRSVG",
.description = "SVG library developed by GNOME",
.website = "https://wiki.gnome.org/Projects/LibRsvg",
.license = "Lesser GNU Public License",
.open_path = &open_path,
.open_memory = &open_memory,
};
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