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1188
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1 /*
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2 * gifwin.c - window functions for ViewGIF 2.0
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3 * by Vaughn Cato
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4 */
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5
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6 #include "viewgif.h"
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7
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8 char *mapgpb();
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9 extern int errno;
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10
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11 checksig()
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12 {
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13 char buf[6];
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14
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15 fread(buf, sizeof(*buf), 6, infile);
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16 if (strncmp(buf, "GIF", 3) != 0)
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17 fatal("file is not a GIF file");
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18 if (strncmp(&buf[3], "87a", 3) != 0)
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19 fatal("Unknown GIF version number");
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20 }
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21
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22 perror(str)
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23 char *str;
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24 {
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25 fprintf(stderr, "%s: error\n", str);
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26 }
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27
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28 error(str, errnum)
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29 char *str;
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30 int errnum;
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31 {
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32 fprintf(stderr, "viewgif: %s\n", str);
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33 exit(errnum);
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34 }
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35
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36 sleep(ticks)
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37 int ticks;
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38 {
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39 #asm
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40 ldx 4,s
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41 os9 F$Sleep
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42 #endasm
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43 }
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44
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45 static char *ustext[] = {
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46 "OS9 ViewGIF 2.0 by Vaughn Cato\n",
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47 "usage: viewgif <filename> [-<option> ...]\n",
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48 " displays a gif picture\n",
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49 "\n",
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50 " options:\n",
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51 " -d[[=]dfactor] Set dithering factor, default is 0\n",
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52 " -a Align to pixels\n",
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53 " -u[=]<filename> Create/use a color usage file\n",
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54 " -m[=]<magfact> Set magnification factor (1-64)\n",
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55 " -x[=]<start x> Set start x (0-64)\n",
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56 " -y[=]<start y> Set start y (0-64)\n",
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57 " -v[[=]<filename>] Generate vef format picture\n",
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58 " -g grey scale picture (average color brite)\n",
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59 " -g2 grey scale picture (max color brite)\n",
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60 " -g3 grey scale picture (NTSC color brite)\n",
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61 " -r Use random generator instead of table\n",
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62 " -s Silent. No info printed\n",
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63 " -i Extended information\n",
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64 " -n No display\n",
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65 " -p[[=]seconds] Pause time (default 0)\n",
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66 " -c Use current screen\n",
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67 " -f Disable flicker\n",
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68 " -b[=]<britefact> Set brightness (1-16)\n",
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69 " -z Zap unused global color map entries\n",
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70 NULL
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71 };
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72
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73 usage()
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74 {
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75 register char **uscan;
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76
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77 for (uscan = ustext; *uscan != NULL; uscan++)
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78 fputs(*uscan, stderr);
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79 exit(1);
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80 }
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81
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82 initwin(firstscreen, oldpath)
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83 bool firstscreen;
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84 int oldpath;
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85 {
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86 register bool newwin;
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87
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88 newwin = (oldpath == -1);
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89
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90 if (newwin) {
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91 if (!newscrn && firstscreen) {
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92 /* just use stdout */
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93 actwin = oldpath = 1;
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94 dwend();
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95 } else if ((actwin = oldpath = open("/w", 3)) == -1)
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96 exit(errno);
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97 } else {
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98 actwin = oldpath;
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99 dwend();
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100 }
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101
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102 dwset(gmode ? 7 : 8, 0, 0, gmode ? 80 : 40, 24, 0, 0, 0);
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103 curoff();
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104 select();
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105 flushwin();
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106
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107 if (newwin && firstscreen) {
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108 groupnum = getpid();
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109 bufnum = 1;
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110 getblk(groupnum, bufnum, 0, 0, 640, 1);
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111 flushwin();
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112 if ((gpbufptr = mapgpb(actwin, groupnum, bufnum, 1)) == NULL)
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113 exit(errno);
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114 }
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115
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116 return actwin;
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117 }
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118
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119 dwset(sty, cpx, cpy, szx, szy, prn1, prn2, prn3)
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120 int sty, cpx, cpy, szx, szy, prn1, prn2, prn3;
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121 {
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122 static char outstr[] = {
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123 0x1b, 0x20, 0, 0, 0, 0, 0, 0, 0, 0
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124 };
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125 int size;
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126
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127 outstr[2] = sty;
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128 outstr[3] = cpx;
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129 outstr[4] = cpy;
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130 outstr[5] = szx;
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131 outstr[6] = szy;
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132 if (sty > 0 && sty <= 8) {
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133 outstr[7] = prn1;
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134 outstr[8] = prn2;
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135 outstr[9] = prn3;
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136 size = sizeof(outstr);
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137 } else
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138 size = sizeof(outstr) - 3;
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139 writemem(outstr, size);
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140 }
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141
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142 dwend()
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143 {
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144 static char outstr[] = {0x1b, 0x24};
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145
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146 writemem(outstr, sizeof(outstr));
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147 }
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148
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149 select()
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150 {
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151 static char outstr[] = {0x1b, 0x21};
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152
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153 writemem(outstr, sizeof(outstr));
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154 }
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155
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156 bell()
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157 {
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158 char c = 7;
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159 writemem(&c, 1);
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160 }
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161
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162 palette(prn, ctn)
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163 {
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164 static char outstr[] = {0x1b, 0x31, 0, 0};
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165
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166 outstr[2] = prn;
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167 outstr[3] = ctn;
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168 writemem(outstr, sizeof(outstr));
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169 }
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170
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171 point(x, y)
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172 int x, y;
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173 {
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174 static char outstr[] = {0x1b, 0x42, 0, 0, 0, 0};
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175
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176 *(int *) &outstr[2] = x;
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177 *(int *) &outstr[4] = y;
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178 writemem(outstr, sizeof(outstr));
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179 }
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180
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181 lineto(x, y)
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182 int x, y;
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183 {
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184 static char outstr[] = {0x1b, 0x46, 0, 0, 0, 0};
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185
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186 *(int *) &outstr[2] = x;
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187 *(int *) &outstr[4] = y;
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188 writemem(outstr, sizeof(outstr));
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189 }
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190
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191 fcolor(c)
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192 int c;
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193 {
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194 static char outstr[] = {0x1b, 0x32, 0};
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195
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196 outstr[2] = c;
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197 writemem(outstr, sizeof(outstr));
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198 }
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199
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200 border(c)
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201 int c;
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202 {
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203 static char outstr[] = {0x1b, 0x34, 0};
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204
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205 outstr[2] = c;
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206 writemem(outstr, sizeof(outstr));
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207 }
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208
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209 SetDPtr(x, y)
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210 int x, y;
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211 {
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212 static char outstr[] = {0x1b, 0x40, 0, 0, 0, 0};
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213
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214 *(int *) &outstr[2] = x;
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215 *(int *) &outstr[4] = y;
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216 writemem(outstr, sizeof(outstr));
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217 }
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218
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219 curoff()
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220 {
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221 static char outstr[] = {0x05, 0x20};
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222
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223 writemem(outstr, sizeof(outstr));
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224 }
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225
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226 getblk(grp, bfn, cpx, cpy, szx, szy)
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227 int grp, bfn, cpx, cpy, szx, szy;
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228 {
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229 static char outstr[] = {0x1b, 0x2c, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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230
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231 outstr[2] = grp;
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232 outstr[3] = bfn;
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233 *(int *) (&outstr[4]) = cpx;
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234 *(int *) (&outstr[6]) = cpy;
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235 *(int *) (&outstr[8]) = szx;
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236 *(int *) (&outstr[10]) = szy;
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237 writemem(outstr, sizeof(outstr));
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238 }
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239
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240 putblk(grp, bfn, cpx, cpy)
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241 int grp, bfn, cpx, cpy;
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242 {
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243 static char outstr[] = {0x1b, 0x2d, 0, 0, 0, 0, 0, 0};
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244
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245 outstr[2] = grp;
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246 outstr[3] = bfn;
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247 *(int *) (&outstr[4]) = cpx;
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248 *(int *) (&outstr[6]) = cpy;
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249 writemem(outstr, sizeof(outstr));
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250 }
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251
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252 killbuf(grp, bfn)
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253 int grp, bfn;
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254 {
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255 static char outstr[] = {0x1b, 0x2a, 0, 0};
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256
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257 outstr[2] = grp;
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258 outstr[3] = bfn;
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259 writemem(outstr, sizeof(outstr));
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260 }
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261
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262 char *
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263 mapgpb(path, grp, bfn, action)
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264 int path, grp, bfn, action;
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265 {
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266 #asm
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267 lda 7,s group
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268 ldb 9,s buffer
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269 tfr d,x ->X
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270 lda 5,s path
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271 ldb #$SS.MpGPB setstat code
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272 pshs y
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273 ldy 10+2,s action (1 => map, 0 => unmap)
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274 os9 I$SetStt
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275 puls y
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276 bcc _mapgpb1
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277 clra error--
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278 std errno,y save error code,
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279 ldx #0 return NULL pointer
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280 _mapgpb1: tfr x,d move pointer into position for return
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281 #endasm
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282 }
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283
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284 static char outbuf[256];
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285 static DIRECT char *outptr = outbuf;
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286 static DIRECT int bufleft = sizeof(outbuf);
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287
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288 writemem(str, size)
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289 register char *str;
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290 register int size;
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291 {
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292 while (size > bufleft) {
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293 size -= bufleft;
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294 while (--bufleft >= 0)
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295 *outptr++ = *str++;
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296 flushwin();
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297 }
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298 bufleft -= size;
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299 while (--size >= 0)
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300 *outptr++ = *str++;
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301 }
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302
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303 flushwin()
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304 {
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305 write(actwin, outbuf, outptr - outbuf);
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306 outptr = outbuf;
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307 bufleft = sizeof(outbuf);
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308 }
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