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