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#ifndef IMV_SOURCE_H
#define IMV_SOURCE_H
#include <pthread.h>
#include <stdbool.h>
#include "image.h"
struct imv_source_message {
/* Pointer to sender of message */
struct imv_source *source;
/* User-supplied pointer */
void *user_data;
/* Receiver is responsible for destroying image */
struct imv_image *image;
/* If an animated gif, the frame's duration in milliseconds, else 0 */
int frametime;
/* Error message if image was NULL */
const char *error;
};
/* While imv_image represents a single frame of an image, be it a bitmap or
* vector image, imv_source represents an open handle to an image file, which
* can emit one or more imv_images.
*/
struct imv_source {
/* usually the path of the image this is the source of */
char *name;
/* source's image dimensions */
int width;
int height;
/* Usually 1, more if animated */
int num_frames;
/* Next frame to be loaded, 0-indexed */
int next_frame;
/* Attempted to be locked by load_first_frame or load_next_frame.
* If the mutex can't be locked, the call is aborted.
* Used to prevent the source from having multiple worker threads at once.
* Released by the source before calling the message callback with a result.
*/
pthread_mutex_t busy;
/* Trigger loading of the first frame. Returns 0 on success. */
void *(*load_first_frame)(struct imv_source *src);
/* Trigger loading of next frame. Returns 0 on success. */
void *(*load_next_frame)(struct imv_source *src);
/* Safely free contents of this source. After this returns
* it is safe to dealocate/overwrite the imv_source instance.
*/
void (*free)(struct imv_source *src);
/* User-specified callback for returning messages */
void (*callback)(struct imv_source_message *message);
/* User-specified pointer, included in returned messages */
void *user_data;
/* Implementation private data */
void *private;
};
#endif
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