mirror of
https://github.com/aseprite/aseprite.git
synced 2024-12-27 03:16:58 +00:00
316 lines
13 KiB
C
316 lines
13 KiB
C
/******************************************************************************
|
|
|
|
gif_lib.h - service library for decoding and encoding GIF images
|
|
|
|
*****************************************************************************/
|
|
|
|
#ifndef _GIF_LIB_H_
|
|
#define _GIF_LIB_H_ 1
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif /* __cplusplus */
|
|
|
|
#define GIFLIB_MAJOR 5
|
|
#define GIFLIB_MINOR 1
|
|
#define GIFLIB_RELEASE 0
|
|
|
|
#define GIF_ERROR 0
|
|
#define GIF_OK 1
|
|
|
|
#include <stddef.h>
|
|
#ifdef HAVE_STDBOOL_H
|
|
#include <stdbool.h>
|
|
#elif !defined __cplusplus
|
|
typedef int bool;
|
|
#define false 0
|
|
#define true 1
|
|
#endif
|
|
|
|
#define GIF_STAMP "GIFVER" /* First chars in file - GIF stamp. */
|
|
#define GIF_STAMP_LEN sizeof(GIF_STAMP) - 1
|
|
#define GIF_VERSION_POS 3 /* Version first character in stamp. */
|
|
#define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */
|
|
#define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */
|
|
|
|
typedef unsigned char GifPixelType;
|
|
typedef unsigned char *GifRowType;
|
|
typedef unsigned char GifByteType;
|
|
typedef unsigned int GifPrefixType;
|
|
typedef int GifWord;
|
|
|
|
typedef struct GifColorType {
|
|
GifByteType Red, Green, Blue;
|
|
} GifColorType;
|
|
|
|
typedef struct ColorMapObject {
|
|
int ColorCount;
|
|
int BitsPerPixel;
|
|
bool SortFlag;
|
|
GifColorType *Colors; /* on malloc(3) heap */
|
|
} ColorMapObject;
|
|
|
|
typedef struct GifImageDesc {
|
|
GifWord Left, Top, Width, Height; /* Current image dimensions. */
|
|
bool Interlace; /* Sequential/Interlaced lines. */
|
|
ColorMapObject *ColorMap; /* The local color map */
|
|
} GifImageDesc;
|
|
|
|
typedef struct ExtensionBlock {
|
|
int ByteCount;
|
|
GifByteType *Bytes; /* on malloc(3) heap */
|
|
int Function; /* The block function code */
|
|
#define CONTINUE_EXT_FUNC_CODE 0x00 /* continuation subblock */
|
|
#define COMMENT_EXT_FUNC_CODE 0xfe /* comment */
|
|
#define GRAPHICS_EXT_FUNC_CODE 0xf9 /* graphics control (GIF89) */
|
|
#define PLAINTEXT_EXT_FUNC_CODE 0x01 /* plaintext */
|
|
#define APPLICATION_EXT_FUNC_CODE 0xff /* application block */
|
|
} ExtensionBlock;
|
|
|
|
typedef struct SavedImage {
|
|
GifImageDesc ImageDesc;
|
|
GifByteType *RasterBits; /* on malloc(3) heap */
|
|
int ExtensionBlockCount; /* Count of extensions before image */
|
|
ExtensionBlock *ExtensionBlocks; /* Extensions before image */
|
|
} SavedImage;
|
|
|
|
typedef struct GifFileType {
|
|
GifWord SWidth, SHeight; /* Size of virtual canvas */
|
|
GifWord SColorResolution; /* How many colors can we generate? */
|
|
GifWord SBackGroundColor; /* Background color for virtual canvas */
|
|
GifByteType AspectByte; /* Used to compute pixel aspect ratio */
|
|
ColorMapObject *SColorMap; /* Global colormap, NULL if nonexistent. */
|
|
int ImageCount; /* Number of current image (both APIs) */
|
|
GifImageDesc Image; /* Current image (low-level API) */
|
|
SavedImage *SavedImages; /* Image sequence (high-level API) */
|
|
int ExtensionBlockCount; /* Count extensions past last image */
|
|
ExtensionBlock *ExtensionBlocks; /* Extensions past last image */
|
|
int Error; /* Last error condition reported */
|
|
void *UserData; /* hook to attach user data (TVT) */
|
|
void *Private; /* Don't mess with this! */
|
|
} GifFileType;
|
|
|
|
#define GIF_ASPECT_RATIO(n) ((n)+15.0/64.0)
|
|
|
|
typedef enum {
|
|
UNDEFINED_RECORD_TYPE,
|
|
SCREEN_DESC_RECORD_TYPE,
|
|
IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */
|
|
EXTENSION_RECORD_TYPE, /* Begin with '!' */
|
|
TERMINATE_RECORD_TYPE /* Begin with ';' */
|
|
} GifRecordType;
|
|
|
|
/* func type to read gif data from arbitrary sources (TVT) */
|
|
typedef int (*InputFunc) (GifFileType *, GifByteType *, int);
|
|
|
|
/* func type to write gif data to arbitrary targets.
|
|
* Returns count of bytes written. (MRB)
|
|
*/
|
|
typedef int (*OutputFunc) (GifFileType *, const GifByteType *, int);
|
|
|
|
/******************************************************************************
|
|
GIF89 structures
|
|
******************************************************************************/
|
|
|
|
typedef struct GraphicsControlBlock {
|
|
int DisposalMode;
|
|
#define DISPOSAL_UNSPECIFIED 0 /* No disposal specified. */
|
|
#define DISPOSE_DO_NOT 1 /* Leave image in place */
|
|
#define DISPOSE_BACKGROUND 2 /* Set area too background color */
|
|
#define DISPOSE_PREVIOUS 3 /* Restore to previous content */
|
|
bool UserInputFlag; /* User confirmation required before disposal */
|
|
int DelayTime; /* pre-display delay in 0.01sec units */
|
|
int TransparentColor; /* Palette index for transparency, -1 if none */
|
|
#define NO_TRANSPARENT_COLOR -1
|
|
} GraphicsControlBlock;
|
|
|
|
/******************************************************************************
|
|
GIF encoding routines
|
|
******************************************************************************/
|
|
|
|
/* Main entry points */
|
|
GifFileType *EGifOpenFileName(const char *GifFileName,
|
|
const bool GifTestExistence, int *Error);
|
|
GifFileType *EGifOpenFileHandle(const int GifFileHandle, int *Error);
|
|
GifFileType *EGifOpen(void *userPtr, OutputFunc writeFunc, int *Error);
|
|
int EGifSpew(GifFileType * GifFile);
|
|
const char *EGifGetGifVersion(GifFileType *GifFile); /* new in 5.x */
|
|
int EGifCloseFile(GifFileType *GifFile, int *ErrorCode);
|
|
|
|
#define E_GIF_SUCCEEDED 0
|
|
#define E_GIF_ERR_OPEN_FAILED 1 /* And EGif possible errors. */
|
|
#define E_GIF_ERR_WRITE_FAILED 2
|
|
#define E_GIF_ERR_HAS_SCRN_DSCR 3
|
|
#define E_GIF_ERR_HAS_IMAG_DSCR 4
|
|
#define E_GIF_ERR_NO_COLOR_MAP 5
|
|
#define E_GIF_ERR_DATA_TOO_BIG 6
|
|
#define E_GIF_ERR_NOT_ENOUGH_MEM 7
|
|
#define E_GIF_ERR_DISK_IS_FULL 8
|
|
#define E_GIF_ERR_CLOSE_FAILED 9
|
|
#define E_GIF_ERR_NOT_WRITEABLE 10
|
|
|
|
/* These are legacy. You probably do not want to call them directly */
|
|
int EGifPutScreenDesc(GifFileType *GifFile,
|
|
const int GifWidth, const int GifHeight,
|
|
const int GifColorRes,
|
|
const int GifBackGround,
|
|
const ColorMapObject *GifColorMap);
|
|
int EGifPutImageDesc(GifFileType *GifFile,
|
|
const int GifLeft, const int GifTop,
|
|
const int GifWidth, const int GifHeight,
|
|
const bool GifInterlace,
|
|
const ColorMapObject *GifColorMap);
|
|
void EGifSetGifVersion(GifFileType *GifFile, const bool gif89);
|
|
int EGifPutLine(GifFileType *GifFile, GifPixelType *GifLine,
|
|
int GifLineLen);
|
|
int EGifPutPixel(GifFileType *GifFile, const GifPixelType GifPixel);
|
|
int EGifPutComment(GifFileType *GifFile, const char *GifComment);
|
|
int EGifPutExtensionLeader(GifFileType *GifFile, const int GifExtCode);
|
|
int EGifPutExtensionBlock(GifFileType *GifFile,
|
|
const int GifExtLen, const void *GifExtension);
|
|
int EGifPutExtensionTrailer(GifFileType *GifFile);
|
|
int EGifPutExtension(GifFileType *GifFile, const int GifExtCode,
|
|
const int GifExtLen,
|
|
const void *GifExtension);
|
|
int EGifPutCode(GifFileType *GifFile, int GifCodeSize,
|
|
const GifByteType *GifCodeBlock);
|
|
int EGifPutCodeNext(GifFileType *GifFile,
|
|
const GifByteType *GifCodeBlock);
|
|
|
|
/******************************************************************************
|
|
GIF decoding routines
|
|
******************************************************************************/
|
|
|
|
/* Main entry points */
|
|
GifFileType *DGifOpenFileName(const char *GifFileName, int *Error);
|
|
GifFileType *DGifOpenFileHandle(int GifFileHandle, int *Error);
|
|
int DGifSlurp(GifFileType * GifFile);
|
|
GifFileType *DGifOpen(void *userPtr, InputFunc readFunc, int *Error); /* new one (TVT) */
|
|
int DGifCloseFile(GifFileType * GifFile, int *ErrorCode);
|
|
|
|
#define D_GIF_SUCCEEDED 0
|
|
#define D_GIF_ERR_OPEN_FAILED 101 /* And DGif possible errors. */
|
|
#define D_GIF_ERR_READ_FAILED 102
|
|
#define D_GIF_ERR_NOT_GIF_FILE 103
|
|
#define D_GIF_ERR_NO_SCRN_DSCR 104
|
|
#define D_GIF_ERR_NO_IMAG_DSCR 105
|
|
#define D_GIF_ERR_NO_COLOR_MAP 106
|
|
#define D_GIF_ERR_WRONG_RECORD 107
|
|
#define D_GIF_ERR_DATA_TOO_BIG 108
|
|
#define D_GIF_ERR_NOT_ENOUGH_MEM 109
|
|
#define D_GIF_ERR_CLOSE_FAILED 110
|
|
#define D_GIF_ERR_NOT_READABLE 111
|
|
#define D_GIF_ERR_IMAGE_DEFECT 112
|
|
#define D_GIF_ERR_EOF_TOO_SOON 113
|
|
|
|
/* These are legacy. You probably do not want to call them directly */
|
|
int DGifGetScreenDesc(GifFileType *GifFile);
|
|
int DGifGetRecordType(GifFileType *GifFile, GifRecordType *GifType);
|
|
int DGifGetImageDesc(GifFileType *GifFile);
|
|
int DGifGetLine(GifFileType *GifFile, GifPixelType *GifLine, int GifLineLen);
|
|
int DGifGetPixel(GifFileType *GifFile, GifPixelType GifPixel);
|
|
int DGifGetComment(GifFileType *GifFile, char *GifComment);
|
|
int DGifGetExtension(GifFileType *GifFile, int *GifExtCode,
|
|
GifByteType **GifExtension);
|
|
int DGifGetExtensionNext(GifFileType *GifFile, GifByteType **GifExtension);
|
|
int DGifGetCode(GifFileType *GifFile, int *GifCodeSize,
|
|
GifByteType **GifCodeBlock);
|
|
int DGifGetCodeNext(GifFileType *GifFile, GifByteType **GifCodeBlock);
|
|
int DGifGetLZCodes(GifFileType *GifFile, int *GifCode);
|
|
|
|
|
|
/******************************************************************************
|
|
Color table quantization (deprecated)
|
|
******************************************************************************/
|
|
int GifQuantizeBuffer(unsigned int Width, unsigned int Height,
|
|
int *ColorMapSize, GifByteType * RedInput,
|
|
GifByteType * GreenInput, GifByteType * BlueInput,
|
|
GifByteType * OutputBuffer,
|
|
GifColorType * OutputColorMap);
|
|
|
|
/******************************************************************************
|
|
Error handling and reporting.
|
|
******************************************************************************/
|
|
extern const char *GifErrorString(int ErrorCode); /* new in 2012 - ESR */
|
|
|
|
/*****************************************************************************
|
|
Everything below this point is new after version 1.2, supporting `slurp
|
|
mode' for doing I/O in two big belts with all the image-bashing in core.
|
|
******************************************************************************/
|
|
|
|
/******************************************************************************
|
|
Color map handling from gif_alloc.c
|
|
******************************************************************************/
|
|
|
|
extern ColorMapObject *GifMakeMapObject(int ColorCount,
|
|
const GifColorType *ColorMap);
|
|
extern void GifFreeMapObject(ColorMapObject *Object);
|
|
extern ColorMapObject *GifUnionColorMap(const ColorMapObject *ColorIn1,
|
|
const ColorMapObject *ColorIn2,
|
|
GifPixelType ColorTransIn2[]);
|
|
extern int GifBitSize(int n);
|
|
|
|
/******************************************************************************
|
|
Support for the in-core structures allocation (slurp mode).
|
|
******************************************************************************/
|
|
|
|
extern void GifApplyTranslation(SavedImage *Image, GifPixelType Translation[]);
|
|
extern int GifAddExtensionBlock(int *ExtensionBlock_Count,
|
|
ExtensionBlock **ExtensionBlocks,
|
|
int Function,
|
|
unsigned int Len, unsigned char ExtData[]);
|
|
extern void GifFreeExtensions(int *ExtensionBlock_Count,
|
|
ExtensionBlock **ExtensionBlocks);
|
|
extern SavedImage *GifMakeSavedImage(GifFileType *GifFile,
|
|
const SavedImage *CopyFrom);
|
|
extern void GifFreeSavedImages(GifFileType *GifFile);
|
|
|
|
/******************************************************************************
|
|
5.x functions for GIF89 graphics control blocks
|
|
******************************************************************************/
|
|
|
|
int DGifExtensionToGCB(const size_t GifExtensionLength,
|
|
const GifByteType *GifExtension,
|
|
GraphicsControlBlock *GCB);
|
|
size_t EGifGCBToExtension(const GraphicsControlBlock *GCB,
|
|
GifByteType *GifExtension);
|
|
|
|
int DGifSavedExtensionToGCB(GifFileType *GifFile,
|
|
int ImageIndex,
|
|
GraphicsControlBlock *GCB);
|
|
int EGifGCBToSavedExtension(const GraphicsControlBlock *GCB,
|
|
GifFileType *GifFile,
|
|
int ImageIndex);
|
|
|
|
/******************************************************************************
|
|
The library's internal utility font
|
|
******************************************************************************/
|
|
|
|
#define GIF_FONT_WIDTH 8
|
|
#define GIF_FONT_HEIGHT 8
|
|
extern const unsigned char GifAsciiTable8x8[][GIF_FONT_WIDTH];
|
|
|
|
extern void GifDrawText8x8(SavedImage *Image,
|
|
const int x, const int y,
|
|
const char *legend, const int color);
|
|
|
|
extern void GifDrawBox(SavedImage *Image,
|
|
const int x, const int y,
|
|
const int w, const int d, const int color);
|
|
|
|
extern void GifDrawRectangle(SavedImage *Image,
|
|
const int x, const int y,
|
|
const int w, const int d, const int color);
|
|
|
|
extern void GifDrawBoxedText8x8(SavedImage *Image,
|
|
const int x, const int y,
|
|
const char *legend,
|
|
const int border, const int bg, const int fg);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif /* __cplusplus */
|
|
#endif /* _GIF_LIB_H */
|
|
|
|
/* end */
|