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#ifndef CGIF_H
#define CGIF_H
#include <stdint.h>
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
// flags to set the GIF/frame-attributes
#define CGIF_ATTR_IS_ANIMATED (1uL << 1) // make an animated GIF (default is non-animated GIF)
#define CGIF_ATTR_NO_GLOBAL_TABLE (1uL << 2) // disable global color table (global color table is default)
#define CGIF_ATTR_HAS_TRANSPARENCY (1uL << 3) // first entry in color table contains transparency (alpha channel)
#define CGIF_ATTR_NO_LOOP (1uL << 4) // don't loop a GIF animation: only play it one time.
#define CGIF_GEN_KEEP_IDENT_FRAMES (1uL << 0) // keep frames that are identical to previous frame (default is to drop them)
#define CGIF_FRAME_ATTR_USE_LOCAL_TABLE (1uL << 0) // use a local color table for a frame (local color table is not used by default)
#define CGIF_FRAME_ATTR_HAS_ALPHA (1uL << 1) // alpha channel index provided by user (transIndex field)
#define CGIF_FRAME_ATTR_HAS_SET_TRANS (1uL << 2) // transparency setting provided by user (transIndex field)
#define CGIF_FRAME_ATTR_INTERLACED (1uL << 3) // encode frame interlaced (default is not interlaced)
// flags to decrease GIF-size
#define CGIF_FRAME_GEN_USE_TRANSPARENCY (1uL << 0) // use transparency optimization (setting pixels identical to previous frame transparent)
#define CGIF_FRAME_GEN_USE_DIFF_WINDOW (1uL << 1) // do encoding just for the sub-window that has changed from previous frame
#define CGIF_INFINITE_LOOP (0x0000uL) // for animated GIF: 0 specifies infinite loop
typedef enum {
CGIF_ERROR = -1, // something unspecified failed
CGIF_OK = 0, // everything OK
CGIF_EWRITE, // writing GIF data failed
CGIF_EALLOC, // allocating memory failed
CGIF_ECLOSE, // final call to fclose failed
CGIF_EOPEN, // failed to open output file
CGIF_EINDEX, // invalid index in image data provided by user
// internal section (values subject to change)
CGIF_PENDING,
} cgif_result;
typedef struct st_gif CGIF; // struct for the full GIF
typedef struct st_gifconfig CGIF_Config; // global cofinguration parameters of the GIF
typedef struct st_frameconfig CGIF_FrameConfig; // local configuration parameters for a frame
typedef int cgif_write_fn(void* pContext, const uint8_t* pData, const size_t numBytes); // callback function for stream-based output
// prototypes
CGIF* cgif_newgif (CGIF_Config* pConfig); // creates a new GIF (returns pointer to new GIF or NULL on error)
int cgif_addframe (CGIF* pGIF, CGIF_FrameConfig* pConfig); // adds the next frame to an existing GIF (returns 0 on success)
int cgif_close (CGIF* pGIF); // close file and free allocated memory (returns 0 on success)
// CGIF_Config type (parameters passed by user)
// note: must stay AS IS for backward compatibility
struct st_gifconfig {
uint8_t* pGlobalPalette; // global color table of the GIF
const char* path; // path of the GIF to be created, mutually exclusive with pWriteFn
uint32_t attrFlags; // fixed attributes of the GIF (e.g. whether it is animated or not)
uint32_t genFlags; // flags that determine how the GIF is generated (e.g. optimization)
uint16_t width; // width of each frame in the GIF
uint16_t height; // height of each frame in the GIF
uint16_t numGlobalPaletteEntries; // size of the global color table
uint16_t numLoops; // number of repetitons of an animated GIF (set to INFINITE_LOOP for infinite loop)
cgif_write_fn *pWriteFn; // callback function for chunks of output data, mutually exclusive with path
void* pContext; // opaque pointer passed as the first parameter to pWriteFn
};
// CGIF_FrameConfig type (parameters passed by user)
// note: must stay AS IS for backward compatibility
struct st_frameconfig {
uint8_t* pLocalPalette; // local color table of a frame
uint8_t* pImageData; // image data to be encoded
uint32_t attrFlags; // fixed attributes of the GIF frame
uint32_t genFlags; // flags that determine how the GIF frame is created (e.g. optimization)
uint16_t delay; // delay before the next frame is shown (units of 0.01 s)
uint16_t numLocalPaletteEntries; // size of the local color table
uint8_t transIndex; // introduced with V0.2.0
};
#ifdef __cplusplus
}
#endif
#endif // CGIF_H