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1188
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1 /*
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2 * viewgif.h -- common header fodder for viewgif
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3 */
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4
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5 #include <stdio.h>
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6
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7 #ifdef OSK
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8 /* the OS-9/68000 C compiler knows about void now! */
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9 #define DIRECT
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10 typedef unsigned char BYTE;
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11 #define arith(byte) (byte)
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12 #else
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13 typedef int void;
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14 #define DIRECT direct
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15 typedef char BYTE;
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16 #define arith(byte) ((byte) & 0xff)
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17 #endif
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18
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19 /* the canonical dodge for being sure of exactly one defining declaration */
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20
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21 #ifndef EXTERN
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22 #define EXTERN extern
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23 #endif
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24
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25 typedef char bool; /* make up for a C deficiency */
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26
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27 #define FALSE (1 == 0)
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28 #define TRUE (!FALSE)
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29
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30 #define elements(array) (sizeof(array) / sizeof(array[0]))
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31 #define maxnum(bits) ((1 << (bits)) - 1)
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32
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33 /*
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34 * typedef to let us look at RGB colors two ways--one, as an array of
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35 * components; two, as a structure with nameable components.
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36 */
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37
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38 typedef union {
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39 BYTE rgbarr[3];
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40 struct {
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41 BYTE rval, gval, bval;
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42 } rgbstr;
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43 } rgbcolor;
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44
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45 #define red rgbstr.rval
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46 #define green rgbstr.gval
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47 #define blue rgbstr.bval
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48
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49 /* Values and variables related to the GIF spec */
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50
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51 #define MGCLUT 256 /* maximum number of colors in a GIF picture */
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52 #define GBITS 8 /* # of bits in each component of a GIF color */
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53 #define MCODE 4096 /* number of 12-bit LZ codes */
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54
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55 typedef struct cstruct {
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56 struct cstruct *prefix;
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57 char first, suffix;
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58 } codetype;
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59
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60 EXTERN bool coloruse[MGCLUT]; /* flags colors in use */
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61 EXTERN bool globuse[MGCLUT]; /* global usage flag */
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62 EXTERN rgbcolor globclut[MGCLUT]; /* RGB colors in image */
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63 EXTERN DIRECT int globbits; /* # bits for global color map */
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64 EXTERN DIRECT int globcolors; /* # possible colors */
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65 EXTERN DIRECT unsigned imagwid, imaghigh; /* image width/height in pixels */
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66
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67 EXTERN codetype codetab[MCODE]; /* LZ code table */
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68 EXTERN BYTE codestk[MCODE]; /* buffer for decoded bytes */
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69 EXTERN DIRECT int codesize; /* LZ code size in bits */
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70 EXTERN DIRECT int codemask; /* LZ code mask */
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71 EXTERN DIRECT int clear; /* code for code table clear */
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72 EXTERN DIRECT int eoi; /* code for end of image */
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73 EXTERN DIRECT int datasize; /* ??? */
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74
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75 /* Now for CoCo-related stuff... */
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76
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77 #define MCCLUT 16 /* max size of Color Look-Up Table on CoCo 3 */
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78 #define CBITS 2 /* # of bits in each component of a CoCo 3 color */
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79 #define MROWS 192 /* max number of rows we can display */
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80 #define MCOLS 640 /* max number of cols we can display */
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81
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82 #define MSCREENS 2 /* number of screens we may cycle among */
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83
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84 /* type to hold the CoCo encoding of a color */
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85
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86 typedef BYTE colorcode;
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87
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88 /*
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89 * type to represent the screens that will collectively contain the
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90 * GIF image for display--we add one to the sizes of the arrays for
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91 * palettes to try to speed up the search for color mappings (see
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92 * setmap.c functions)
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93 */
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94
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95 typedef struct {
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96 int winpath; /* path # for window to display on */
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97 int clutsize; /* colors actually used */
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98 rgbcolor clut[MCCLUT]; /* their RGB values */
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99 colorcode pal[MCCLUT]; /* their CoCo encodings */
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100 } cocoscreen;
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101
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102 typedef struct {
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103 char addval;
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104 char clutval[MSCREENS];
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105 } xlate;
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106
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107 EXTERN cocoscreen screen[MSCREENS]; /* screens to be cycled among */
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108 EXTERN int ilevtab[MROWS + 1]; /* interleave table */
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109 EXTERN int xtab[MCOLS]; /* ??? */
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110 EXTERN int linestor[MCOLS]; /* ??? */
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111 EXTERN xlate transtab[MGCLUT][5]; /* translations of GIF colors */
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112 EXTERN char randtab[16][16]; /* pseudo-random table */
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113
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114 /* non-scan line values for ilevtab[] */
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115 #define ILEVMISS (-1) /* marks scan lines missed */
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116 /* in readimag() scaling loops */
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117 #define ILEVEND (-20) /* end marker guaranteed not */
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118 /* to match a valid scan line */
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119 /* or ILEVMISS! */
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120
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121 /* conversion between GIF's RGB space and the CoCo's RGB space */
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122 #define SCALE1 (maxnum(GBITS) / maxnum(CBITS))
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123 #define SCALE2 (SCALE1 / 2)
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124
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125 /* limits */
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126
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127 /* dithering factor */
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128 #define MAXDITH1 (SCALE1 / 2)
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129 #define MAXDITH2 (SCALE2 / 2)
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130 #define BOGUSDITH 127 /* end marker for addval */
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131 /* color tolerance (represented by negative "dithering factor") */
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132 #define MAXTOL1 SCALE1
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133 #define MAXTOL2 SCALE2
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134 /* magnification factor */
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135 #define MINMAG 1
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136 #define MAXMAG 64
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137 /* brightness */
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138 #define MINBRITE 1
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139 #define MAXBRITE 16
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140 /* starting coordinates (units: 64ths of the image size along the axis) */
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141 #define MINCOORD 1
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142 #define MAXCOORD 64
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143
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144 /* some symbolic names for the values of some twistable knobs */
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145
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146 #define NO_INFO 0
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147 #define SOME_INFO 1
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148 #define MUCH_INFO 2
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149
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150 #define NO_GRAY 0
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151 #define AVG_GRAY 1
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152 #define MAX_GRAY 2
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153 #define NTSC_GRAY 3
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154
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155 /* default values */
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156
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157 #define D_INFO SOME_INFO
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158 #define D_GRAY NO_GRAY
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159 #define D_BRITE MAXBRITE
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160 #define D_DITHER MAXDITH1
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161 #define D_MAG MINMAG
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162 #define D_HEIGHT MROWS
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163
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164 EXTERN DIRECT FILE *infile; /* file containing GIF image */
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165 EXTERN DIRECT long clutpos; /* position of global CLUT in file */
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166 EXTERN DIRECT int infomode; /* control amount of commentary */
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167 EXTERN DIRECT int graytype; /* what kind of gray scale, if any */
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168 EXTERN DIRECT int dfactor; /* dithering factor */
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169 EXTERN DIRECT int maxdith; /* upper bound on random dither */
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170 EXTERN DIRECT int magfact; /* magnification factor */
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171 EXTERN DIRECT int britefac; /* brightness factor */
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172 EXTERN DIRECT int startx, starty; /* coord to map to top left corner */
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173 EXTERN DIRECT bool realrand; /* use random #s instead of table */
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174 EXTERN DIRECT bool flicker; /* cycle among screens */
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175 EXTERN DIRECT bool dispon; /* display the image */
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176 EXTERN DIRECT bool zapmap; /* overwrite unused map colors */
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177 EXTERN DIRECT bool vefon; /* save the image in VEF fmt */
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178 EXTERN DIRECT bool aligned; /* align to pixels */
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179 EXTERN DIRECT bool newscrn; /* switch to new window for display */
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180 EXTERN DIRECT char *usefname; /* to name of color usage file */
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181 EXTERN DIRECT char *vefname; /* to name of VEF output file */
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182 EXTERN DIRECT int mywidth, myheight; /* width, height we will display */
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183 EXTERN DIRECT int actwin; /* path for buffered gfx data */
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184 EXTERN DIRECT int groupnum, bufnum; /* get/put buffer information */
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185 EXTERN DIRECT int framenum; /* frame number--whatever that is */
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186 EXTERN DIRECT char *gpbufptr; /* pointer to get/put buffer */
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187 EXTERN DIRECT int gmode; /* graphics mode we're using */
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188 EXTERN DIRECT int newuse; /* ??? */
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189 EXTERN DIRECT bool (*approx)(); /* to color approximation function */
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190 EXTERN DIRECT int minmod; /* modulus for minadd() */
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191 EXTERN DIRECT int low0, up0; /* default upper/lower limits for */
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192 /* approximation searches */
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193 extern bool approx1(); /* one-screen approximation */
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194 extern bool approx2(); /* two-screen approximation */
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195
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196 /* miscellanea for support routines */
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197 #define fatal(s) error((s), 1) /* fatal error (no natural errno) */
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