1 /* Stereograph 0.16, 12/04/2000; 2 * Graphics I/O functions; 3 * Copyright (c) 2000 by Fabian Januszewski <fabian.linux@januszewski.de> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 */ 19 20 21 #include <stdio.h> 22 #include <stdlib.h> 23 24 #include "renderer.h" 25 #include "gfxio.h" 26 #include "globals.h" 27 28 int Read_Gfx_File (char *file_name, struct GFX_DATA *gfx) 29 { 30 int a; 31 FILE *ifile = NULL; 32 33 ifile = fopen(file_name, "r"); 34 35 if(ifile == NULL) { 36 if(verbose) printf("FAILED;\n"); else fprintf(stderr, "loading gfx data...FAILED;\n"); 37 fprintf(stderr, "cannot open file '%s'!\n", file_name); 38 return -1; 39 } else { 40 a = Read_TARGA(ifile, gfx); 41 } 42 fclose(ifile); 43 ifile = NULL; 44 return a; 45 } 46 47 48 int Write_Gfx_File (char *file_name, struct GFX_DATA *gfx) 49 { 50 int a; 51 FILE *ofile = NULL; 52 53 if(verbose) printf("saving '%s' (%i*%i)...", file_name, gfx->Width, gfx->Height); 54 if(!file_name) 55 return Write_PIPE(stdout, gfx); 56 else { 57 ofile = fopen(file_name, "w+"); 58 59 if(ofile == NULL) { 60 if(verbose) printf("FAILED;\n"); else fprintf(stderr, "writing gfx data...FAILED;\n"); 61 fprintf(stderr, "cannot create file %s!\n", file_name); 62 return -1; 63 } else 64 a = Write_TARGA(ofile, gfx); 65 fclose(ofile); 66 ofile = NULL; 67 return a; 68 } 69 } 70 71 72 int Read_TARGA (FILE *ifile, struct GFX_DATA *gfx) 73 { 74 /* TARGA uses the Intel format for integer coding (low byte first) */ 75 76 unsigned char header[20]; 77 int x, y, *palette, c, l, s, z; 78 79 /* reading all header information */ 80 if(fread(header, sizeof(char), 18, ifile) != 18) { 81 if(verbose) printf("FAILED!\n"); else fprintf(stderr, "reading gfx data...FAILED;\n"); 82 fprintf(stderr, "cannot read header! (file corrupt?)\n"); 83 return -2; 84 } 85 86 /* general measurements */ 87 gfx->Width = (int)header[12] + (int)header[13]*256; 88 gfx->Height = (int)header[14] + (int)header[15]*256; 89 gfx->Data = (int*)malloc(gfx->Width*gfx->Height*sizeof(int)); 90 if(!gfx->Data) { 91 if(verbose) printf("FAILED;\n"); else fprintf(stderr, "reading gfx data...FAILED;\n"); 92 fprintf(stderr, "error allocating memory for image dimensions of %i * %i pixels in 32 bit\n", gfx->Width, gfx->Height); 93 fprintf(stderr, "debug - header follows:\n"); 94 for(x = 0; x < 20; x += 4) 95 fprintf(stderr, " %i, %i, %i, %i;\n", (int)header[x], (int)header[x + 1], (int)header[x + 2], (int)header[x + 3]); 96 return -3; 97 } 98 99 /* reading image identification field */ 100 for(x = 0; x < header[0]; x++) 101 getc(ifile); 102 103 /* reading palette data */ 104 if((header[1] != 0) && ((header[5] + header[6]*256) > 0) && (((header[3] + header[4]*256) + (header[5] + header[6]*256)) <= 256)) { 105 palette = (int*)malloc(((header[3] + header[4]*256) + (header[5] + header[6]*256)) * sizeof(int)); 106 for(x = header[3] + header[4]*256; (x < (header[5] + header[6]*256)); x++) 107 Read_TARGA_RGB(ifile, (int)header[7], NULL, palette + x); 108 } else 109 palette = NULL; 110 111 if(((header[2] == 2) && (header[16] >= 16)) || (((header[2] == 1) || header[2] == 3) && (header[16] == 8))) { 112 /* type 1: 8 bit/palette, uncompressed; type 2: 16 bit++, uncompressed; type 3: 8 bit monocrome, uncompressed; */ 113 if(header[17] & 32) { 114 for(y = 0; y < gfx->Height; y++) { 115 if(header[17] & 16) 116 for(x = gfx->Width - 1; x >= 0; x--) 117 Read_TARGA_RGB(ifile, (int)header[16], palette, gfx->Data + (y * gfx->Width) + x); 118 else 119 for(x = 0; x < gfx->Width; x++) 120 Read_TARGA_RGB(ifile, (int)header[16], palette, gfx->Data + (y * gfx->Width) + x); 121 } 122 } else { 123 for(y = gfx->Height - 1; y >= 0; y--) { 124 if(header[17] & 16) 125 for(x = gfx->Width - 1; x >= 0; x--) 126 Read_TARGA_RGB(ifile, (int)header[16], palette, gfx->Data + (y * gfx->Width) + x); 127 else 128 for(x = 0; x < gfx->Width; x++) 129 Read_TARGA_RGB(ifile, (int)header[16], palette, gfx->Data + (y * gfx->Width) + x); 130 } 131 } 132 if(verbose) printf("gfx data read (%i*%i);\n", gfx->Width, gfx->Height); 133 free(palette); 134 return 0; 135 } else if(((header[2] == 10) && (header[16] >= 16)) || (((header[2] == 9) || header[2] == 11) && (header[16] == 8))) { 136 /* type 9: 8 bit/palette RLE; type 10: 16 bit++, RLE; type 11: 8 bit monocrome, RLE; */ 137 for(z = 0; ((l = getc(ifile)) != EOF) && (z < (gfx->Height * gfx->Width)); ) { 138 if(l & 128) { /* compressed data follows */ 139 l &= 127; /* extracting length */ 140 Read_TARGA_RGB(ifile, (int)header[16], palette, &c); 141 for(s = 0; (s <= l); s++) { 142 x = z % gfx->Width; 143 y = (z - x) / gfx->Width; 144 if(header[17] & 16) 145 x = gfx->Width - 1 - x; 146 if(!(header[17] & 32)) 147 y = gfx->Height - 1 - y; 148 if((x < gfx->Width) && (y < gfx->Height) && (x >= 0) && (y >= 0)) 149 gfx->Data[(y * gfx->Width) + x] = c; 150 else 151 fprintf(stderr, "(%i, %i) => error\n", x, y); 152 z++; 153 } 154 } else { /* uncompressed data follows */ 155 for(s = 0; (s <= l); s++) { 156 x = z % gfx->Width; 157 y = (z - x) / gfx->Width; 158 if(header[17] & 16) 159 x = gfx->Width - 1 - x; 160 if(!(header[17] & 32)) 161 y = gfx->Height - 1 - y; 162 if((x < gfx->Width) && (y < gfx->Height) && (x >= 0) && (y >= 0)) 163 Read_TARGA_RGB(ifile, (int)header[16], palette, gfx->Data + (y * gfx->Width) + x); 164 else 165 fprintf(stderr, "(%i, %i) => error\n", x, y); 166 z++; 167 } 168 } 169 } 170 if(verbose) printf("gfx data read (%i*%i);\n", gfx->Width, gfx->Height); 171 free(palette); 172 return 0; 173 } else { 174 if(verbose) printf("FAILED;\n"); else fprintf(stderr, "reading gfx data...FAILED;\n"); 175 fprintf(stderr, "Unsupported Targa Data Format %i@%i;\nOnly TARGA types 1, 2, 3 (uncompressed) and 9, 10, 11 (RLE) are supported;\n", header[2], header[16]); 176 free(palette); 177 return -1; 178 } 179 } 180 181 182 int Read_TARGA_RGB(FILE *ifile, int bits, int *palette, int *c) { 183 static int a, r, g, b, z1, z2; 184 a = 0; 185 if(bits == 8) { 186 if(palette) 187 (*c) = palette[(int)getc(ifile)]; 188 else 189 (*c) = (int)getc(ifile) * 65793; /* 65793 = (1+256+65536) */ 190 } else if(bits == 16) { 191 z1 = getc(ifile); 192 z2 = getc(ifile); 193 r = (int)((255.0/31.0) * (float)((z1 & 124) >> 2) ); /* 124 = 64 + 32 + 16 + 8 + 4 */ 194 g = (int)((255.0/31.0) * (float)(((z1 & 3) << 3) | ((z2 & 224) >> 5)) ); /* 224 = 128 + 64 + 32 */ 195 b = (int)((255.0/31.0) * (float)(z2 & 31) ); 196 (*c) = r + (g << 8) + (b << 16); 197 a = z1 & 128; 198 } else { 199 r = getc(ifile); 200 g = getc(ifile); 201 b = getc(ifile); 202 (*c) = r + (g << 8) + (b << 16); 203 if(bits == 32) 204 a = getc(ifile); 205 } 206 return a; /* attribute (alpha/transparency information, 32 bit only) */ 207 } 208 209 /* writes all gfx data to stdout, preceded by the resolution of gfx data - everything 32 bit wide */ 210 int Write_PIPE (FILE *pp, struct GFX_DATA *gfx) 211 { 212 fwrite(&(gfx->Width), sizeof(int), 1, pp); 213 fwrite(&(gfx->Height), sizeof(int), 1, pp); 214 fwrite(gfx->Data, sizeof(int), (gfx->Width) * (gfx->Height), pp); 215 return 0; 216 } 217 218 int Write_TARGA (FILE *ofile, struct GFX_DATA *gfx) 219 { 220 int a, x, y; 221 /* standard TARGA header consists of 18 bytes */ 222 /* id tag length */ 223 putc(strlen("created by stereograph"), ofile); 224 /* color pallette, yes/no */ 225 putc(0, ofile); 226 /* TARGA type 2: RGB 24 bit, no pallette */ 227 putc(2, ofile); 228 /* 5 following bytes contain only pallette information */ 229 putc(0, ofile); 230 putc(0, ofile); 231 putc(0, ofile); 232 putc(0, ofile); 233 putc(0, ofile); 234 /* x offset */ 235 putc(0, ofile); 236 putc(0, ofile); 237 /* y offset */ 238 putc(0, ofile); 239 putc(0, ofile); 240 /* width, low byte first */ 241 putc(gfx->Width & 255, ofile); 242 putc((gfx->Width >> 8) & 255, ofile); 243 /* height */ 244 putc(gfx->Height & 255, ofile); 245 putc((gfx->Height >> 8) & 255, ofile); 246 /* bits per pixel */ 247 putc(32-8, ofile); 248 /* Image Descriptor Flags */ 249 putc(0, ofile); 250 fwrite("created by stereograph", sizeof(char), strlen("created by stereograph"), ofile); 251 /* data follows */ 252 a = 0; 253 for(y = gfx->Height - 1; (y >= 0) && (a != EOF); y--) 254 for(x = 0; (x < gfx->Width) && (a != EOF); x++) { 255 putc(gfx->Data[y * gfx->Width + x] & 255, ofile); 256 putc((gfx->Data[y * gfx->Width + x] >> 8) & 255, ofile); 257 a = putc((gfx->Data[y * gfx->Width + x] >> 16) & 255, ofile); 258 } 259 if(a != EOF) { 260 if(verbose) printf("completed;\n"); 261 return 0; 262 } else { 263 if(verbose) printf("FAILED;\n"); else fprintf(stderr, "writing gfx data...FAILED;\n"); 264 fprintf(stderr, "cannot write to file! (disk full?)\n"); 265 return -1; 266 } 267 } gfxio.c handles graphics I/O for the program. |