1 /******************************************************************************
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3 gif_lib.h - service library for decoding and encoding GIF images
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5 *****************************************************************************/
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8 #define _GIF_LIB_H_ 1
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12 #endif /* __cplusplus */
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14 #define GIFLIB_MAJOR 5
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15 #define GIFLIB_MINOR 1
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16 #define GIFLIB_RELEASE 4
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22 #include <stdbool.h>
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24 #define GIF_STAMP "GIFVER" /* First chars in file - GIF stamp. */
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25 #define GIF_STAMP_LEN sizeof(GIF_STAMP) - 1
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26 #define GIF_VERSION_POS 3 /* Version first character in stamp. */
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27 #define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */
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28 #define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */
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30 typedef unsigned char GifPixelType;
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31 typedef unsigned char *GifRowType;
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32 typedef unsigned char GifByteType;
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33 typedef unsigned int GifPrefixType;
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34 typedef int GifWord;
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36 typedef struct GifColorType {
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37 GifByteType Red, Green, Blue;
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40 typedef struct ColorMapObject {
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44 GifColorType *Colors; /* on malloc(3) heap */
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47 typedef struct GifImageDesc {
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48 GifWord Left, Top, Width, Height; /* Current image dimensions. */
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49 bool Interlace; /* Sequential/Interlaced lines. */
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50 ColorMapObject *ColorMap; /* The local color map */
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53 typedef struct ExtensionBlock {
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55 GifByteType *Bytes; /* on malloc(3) heap */
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56 int Function; /* The block function code */
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57 #define CONTINUE_EXT_FUNC_CODE 0x00 /* continuation subblock */
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58 #define COMMENT_EXT_FUNC_CODE 0xfe /* comment */
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59 #define GRAPHICS_EXT_FUNC_CODE 0xf9 /* graphics control (GIF89) */
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60 #define PLAINTEXT_EXT_FUNC_CODE 0x01 /* plaintext */
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61 #define APPLICATION_EXT_FUNC_CODE 0xff /* application block */
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64 typedef struct SavedImage {
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65 GifImageDesc ImageDesc;
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66 GifByteType *RasterBits; /* on malloc(3) heap */
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67 int ExtensionBlockCount; /* Count of extensions before image */
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68 ExtensionBlock *ExtensionBlocks; /* Extensions before image */
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71 typedef struct GifFileType {
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72 GifWord SWidth, SHeight; /* Size of virtual canvas */
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73 GifWord SColorResolution; /* How many colors can we generate? */
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74 GifWord SBackGroundColor; /* Background color for virtual canvas */
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75 GifByteType AspectByte; /* Used to compute pixel aspect ratio */
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76 ColorMapObject *SColorMap; /* Global colormap, NULL if nonexistent. */
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77 int ImageCount; /* Number of current image (both APIs) */
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78 GifImageDesc Image; /* Current image (low-level API) */
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79 SavedImage *SavedImages; /* Image sequence (high-level API) */
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80 int ExtensionBlockCount; /* Count extensions past last image */
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81 ExtensionBlock *ExtensionBlocks; /* Extensions past last image */
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82 int Error; /* Last error condition reported */
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83 void *UserData; /* hook to attach user data (TVT) */
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84 void *Private; /* Don't mess with this! */
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87 #define GIF_ASPECT_RATIO(n) ((n)+15.0/64.0)
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90 UNDEFINED_RECORD_TYPE,
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91 SCREEN_DESC_RECORD_TYPE,
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92 IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */
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93 EXTENSION_RECORD_TYPE, /* Begin with '!' */
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94 TERMINATE_RECORD_TYPE /* Begin with ';' */
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97 /* func type to read gif data from arbitrary sources (TVT) */
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98 typedef int (*InputFunc) (GifFileType *, GifByteType *, int);
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100 /* func type to write gif data to arbitrary targets.
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101 * Returns count of bytes written. (MRB)
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103 typedef int (*OutputFunc) (GifFileType *, const GifByteType *, int);
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105 /******************************************************************************
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107 ******************************************************************************/
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109 typedef struct GraphicsControlBlock {
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111 #define DISPOSAL_UNSPECIFIED 0 /* No disposal specified. */
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112 #define DISPOSE_DO_NOT 1 /* Leave image in place */
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113 #define DISPOSE_BACKGROUND 2 /* Set area too background color */
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114 #define DISPOSE_PREVIOUS 3 /* Restore to previous content */
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115 bool UserInputFlag; /* User confirmation required before disposal */
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116 int DelayTime; /* pre-display delay in 0.01sec units */
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117 int TransparentColor; /* Palette index for transparency, -1 if none */
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118 #define NO_TRANSPARENT_COLOR -1
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119 } GraphicsControlBlock;
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121 /******************************************************************************
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122 GIF encoding routines
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123 ******************************************************************************/
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125 /* Main entry points */
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126 GifFileType *EGifOpenFileName(const char *GifFileName,
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127 const bool GifTestExistence, int *Error);
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128 GifFileType *EGifOpenFileHandle(const int GifFileHandle, int *Error);
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129 GifFileType *EGifOpen(void *userPtr, OutputFunc writeFunc, int *Error);
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130 int EGifSpew(GifFileType * GifFile);
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131 const char *EGifGetGifVersion(GifFileType *GifFile); /* new in 5.x */
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132 int EGifCloseFile(GifFileType *GifFile, int *ErrorCode);
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134 #define E_GIF_SUCCEEDED 0
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135 #define E_GIF_ERR_OPEN_FAILED 1 /* And EGif possible errors. */
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136 #define E_GIF_ERR_WRITE_FAILED 2
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137 #define E_GIF_ERR_HAS_SCRN_DSCR 3
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138 #define E_GIF_ERR_HAS_IMAG_DSCR 4
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139 #define E_GIF_ERR_NO_COLOR_MAP 5
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140 #define E_GIF_ERR_DATA_TOO_BIG 6
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141 #define E_GIF_ERR_NOT_ENOUGH_MEM 7
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142 #define E_GIF_ERR_DISK_IS_FULL 8
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143 #define E_GIF_ERR_CLOSE_FAILED 9
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144 #define E_GIF_ERR_NOT_WRITEABLE 10
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146 /* These are legacy. You probably do not want to call them directly */
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147 int EGifPutScreenDesc(GifFileType *GifFile,
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148 const int GifWidth, const int GifHeight,
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149 const int GifColorRes,
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150 const int GifBackGround,
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151 const ColorMapObject *GifColorMap);
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152 int EGifPutImageDesc(GifFileType *GifFile,
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153 const int GifLeft, const int GifTop,
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154 const int GifWidth, const int GifHeight,
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155 const bool GifInterlace,
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156 const ColorMapObject *GifColorMap);
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157 void EGifSetGifVersion(GifFileType *GifFile, const bool gif89);
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158 int EGifPutLine(GifFileType *GifFile, GifPixelType *GifLine,
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160 int EGifPutPixel(GifFileType *GifFile, const GifPixelType GifPixel);
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161 int EGifPutComment(GifFileType *GifFile, const char *GifComment);
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162 int EGifPutExtensionLeader(GifFileType *GifFile, const int GifExtCode);
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163 int EGifPutExtensionBlock(GifFileType *GifFile,
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164 const int GifExtLen, const void *GifExtension);
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165 int EGifPutExtensionTrailer(GifFileType *GifFile);
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166 int EGifPutExtension(GifFileType *GifFile, const int GifExtCode,
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167 const int GifExtLen,
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168 const void *GifExtension);
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169 int EGifPutCode(GifFileType *GifFile, int GifCodeSize,
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170 const GifByteType *GifCodeBlock);
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171 int EGifPutCodeNext(GifFileType *GifFile,
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172 const GifByteType *GifCodeBlock);
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174 /******************************************************************************
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175 GIF decoding routines
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176 ******************************************************************************/
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178 /* Main entry points */
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179 GifFileType *DGifOpenFileName(const char *GifFileName, int *Error);
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180 GifFileType *DGifOpenFileHandle(int GifFileHandle, int *Error);
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181 int DGifSlurp(GifFileType * GifFile);
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182 GifFileType *DGifOpen(void *userPtr, InputFunc readFunc, int *Error); /* new one (TVT) */
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183 int DGifCloseFile(GifFileType * GifFile, int *ErrorCode);
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185 #define D_GIF_SUCCEEDED 0
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186 #define D_GIF_ERR_OPEN_FAILED 101 /* And DGif possible errors. */
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187 #define D_GIF_ERR_READ_FAILED 102
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188 #define D_GIF_ERR_NOT_GIF_FILE 103
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189 #define D_GIF_ERR_NO_SCRN_DSCR 104
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190 #define D_GIF_ERR_NO_IMAG_DSCR 105
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191 #define D_GIF_ERR_NO_COLOR_MAP 106
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192 #define D_GIF_ERR_WRONG_RECORD 107
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193 #define D_GIF_ERR_DATA_TOO_BIG 108
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194 #define D_GIF_ERR_NOT_ENOUGH_MEM 109
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195 #define D_GIF_ERR_CLOSE_FAILED 110
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196 #define D_GIF_ERR_NOT_READABLE 111
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197 #define D_GIF_ERR_IMAGE_DEFECT 112
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198 #define D_GIF_ERR_EOF_TOO_SOON 113
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200 /* These are legacy. You probably do not want to call them directly */
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201 int DGifGetScreenDesc(GifFileType *GifFile);
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202 int DGifGetRecordType(GifFileType *GifFile, GifRecordType *GifType);
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203 int DGifGetImageDesc(GifFileType *GifFile);
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204 int DGifGetLine(GifFileType *GifFile, GifPixelType *GifLine, int GifLineLen);
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205 int DGifGetPixel(GifFileType *GifFile, GifPixelType GifPixel);
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206 int DGifGetComment(GifFileType *GifFile, char *GifComment);
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207 int DGifGetExtension(GifFileType *GifFile, int *GifExtCode,
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208 GifByteType **GifExtension);
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209 int DGifGetExtensionNext(GifFileType *GifFile, GifByteType **GifExtension);
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210 int DGifGetCode(GifFileType *GifFile, int *GifCodeSize,
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211 GifByteType **GifCodeBlock);
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212 int DGifGetCodeNext(GifFileType *GifFile, GifByteType **GifCodeBlock);
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213 int DGifGetLZCodes(GifFileType *GifFile, int *GifCode);
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216 /******************************************************************************
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217 Color table quantization (deprecated)
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218 ******************************************************************************/
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219 int GifQuantizeBuffer(unsigned int Width, unsigned int Height,
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220 int *ColorMapSize, GifByteType * RedInput,
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221 GifByteType * GreenInput, GifByteType * BlueInput,
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222 GifByteType * OutputBuffer,
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223 GifColorType * OutputColorMap);
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225 /******************************************************************************
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226 Error handling and reporting.
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227 ******************************************************************************/
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228 extern const char *GifErrorString(int ErrorCode); /* new in 2012 - ESR */
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230 /*****************************************************************************
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231 Everything below this point is new after version 1.2, supporting `slurp
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232 mode' for doing I/O in two big belts with all the image-bashing in core.
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233 ******************************************************************************/
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235 /******************************************************************************
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236 Color map handling from gif_alloc.c
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237 ******************************************************************************/
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239 extern ColorMapObject *GifMakeMapObject(int ColorCount,
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240 const GifColorType *ColorMap);
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241 extern void GifFreeMapObject(ColorMapObject *Object);
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242 extern ColorMapObject *GifUnionColorMap(const ColorMapObject *ColorIn1,
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243 const ColorMapObject *ColorIn2,
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244 GifPixelType ColorTransIn2[]);
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245 extern int GifBitSize(int n);
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248 reallocarray(void *optr, size_t nmemb, size_t size);
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250 /******************************************************************************
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251 Support for the in-core structures allocation (slurp mode).
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252 ******************************************************************************/
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254 extern void GifApplyTranslation(SavedImage *Image, GifPixelType Translation[]);
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255 extern int GifAddExtensionBlock(int *ExtensionBlock_Count,
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256 ExtensionBlock **ExtensionBlocks,
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258 unsigned int Len, unsigned char ExtData[]);
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259 extern void GifFreeExtensions(int *ExtensionBlock_Count,
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260 ExtensionBlock **ExtensionBlocks);
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261 extern SavedImage *GifMakeSavedImage(GifFileType *GifFile,
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262 const SavedImage *CopyFrom);
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263 extern void GifFreeSavedImages(GifFileType *GifFile);
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265 /******************************************************************************
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266 5.x functions for GIF89 graphics control blocks
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267 ******************************************************************************/
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269 int DGifExtensionToGCB(const size_t GifExtensionLength,
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270 const GifByteType *GifExtension,
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271 GraphicsControlBlock *GCB);
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272 size_t EGifGCBToExtension(const GraphicsControlBlock *GCB,
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273 GifByteType *GifExtension);
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275 int DGifSavedExtensionToGCB(GifFileType *GifFile,
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277 GraphicsControlBlock *GCB);
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278 int EGifGCBToSavedExtension(const GraphicsControlBlock *GCB,
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279 GifFileType *GifFile,
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282 /******************************************************************************
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283 The library's internal utility font
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284 ******************************************************************************/
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286 #define GIF_FONT_WIDTH 8
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287 #define GIF_FONT_HEIGHT 8
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288 extern const unsigned char GifAsciiTable8x8[][GIF_FONT_WIDTH];
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290 extern void GifDrawText8x8(SavedImage *Image,
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291 const int x, const int y,
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292 const char *legend, const int color);
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294 extern void GifDrawBox(SavedImage *Image,
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295 const int x, const int y,
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296 const int w, const int d, const int color);
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298 extern void GifDrawRectangle(SavedImage *Image,
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299 const int x, const int y,
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300 const int w, const int d, const int color);
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302 extern void GifDrawBoxedText8x8(SavedImage *Image,
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303 const int x, const int y,
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304 const char *legend,
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305 const int border, const int bg, const int fg);
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309 #endif /* __cplusplus */
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310 #endif /* _GIF_LIB_H */
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