wrlib/raster.c

   1 /* raster.c - main and other misc stuff
   2  *
   3  *  Raster graphics library
   4  *
   5  *  Copyright (c) 1997-2000 Alfredo K. Kojima
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Library General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 2 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Library General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Library General Public
  18  *  License along with this library; if not, write to the Free
  19  *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <config.h>
  23
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <X11/Xlib.h>
  28 #include "wraster.h"
  29
  30 #include <assert.h>
  31
  32
  33 char *WRasterLibVersion="0.9";
  34
  35 int RErrorCode=RERR_NONE;
  36
  37
  38 #define HAS_ALPHA(I)    ((I)->format == RRGBAFormat)
  39
  40
  41 RImage*
  42 RCreateImage(unsigned width, unsigned height, int alpha)
  43 {
  44     RImage *image=NULL;
  45
  46     assert(width>0 && height>0);
  47
  48     image = malloc(sizeof(RImage));
  49     if (!image) {
  50         RErrorCode = RERR_NOMEMORY;
  51         return NULL;
  52     }
  53
  54     memset(image, 0, sizeof(RImage));
  55     image->width = width;
  56     image->height = height;
  57     if (alpha) {
  58         image->format = RRGBAFormat;
  59     } else {
  60         image->format = RRGBFormat;
  61     }
  62     /* the +4 is to give extra bytes at the end of the buffer,
  63      * so that we can optimize image conversion for MMX(tm).. see convert.c
  64      */
  65     image->data = malloc(width * height * (alpha ? 4 : 3) + 4);
  66     if (!image->data) {
  67         RErrorCode = RERR_NOMEMORY;
  68         free(image);
  69         image = NULL;
  70     }
  71
  72     return image;
  73 }
  74
  75
  76
  77 RImage*
  78 RCloneImage(RImage *image)
  79 {
  80     RImage *new_image;
  81
  82     assert(image!=NULL);
  83
  84     new_image = RCreateImage(image->width, image->height, HAS_ALPHA(image));
  85     if (!new_image)
  86       return NULL;
  87
  88     new_image->background = image->background;
  89     memcpy(new_image->data, image->data,
  90            image->width*image->height*(HAS_ALPHA(image) ? 4 : 3));
  91
  92     return new_image;
  93 }
  94
  95
  96 RImage*
  97 RGetSubImage(RImage *image, int x, int y, unsigned width, unsigned height)
  98 {
  99     int i, ofs;
 100     RImage *new_image;
 101     unsigned total_line_size, line_size;
 102
 103     assert(image!=NULL);
 104     assert(x>=0 && y>=0);
 105     assert(x<image->width && y<image->height);
 106     assert(width>0 && height>0);
 107
 108     if (x+width > image->width)
 109         width = image->width-x;
 110     if (y+height > image->height)
 111         height = image->height-y;
 112
 113     new_image = RCreateImage(width, height, HAS_ALPHA(image));
 114
 115     if (!new_image)
 116         return NULL;
 117     new_image->background = image->background;
 118
 119     total_line_size = image->width * (HAS_ALPHA(image) ? 4 : 3);
 120     line_size = width * (HAS_ALPHA(image) ? 4 : 3);
 121
 122     ofs = x*(HAS_ALPHA(image) ? 4 : 3) + y*total_line_size;;
 123
 124     for (i=0; i<height; i++) {
 125         memcpy(&new_image->data[i*line_size],
 126                &image->data[i*total_line_size+ofs], line_size);
 127     }
 128     return new_image;
 129 }
 130
 131
 132 void
 133 RDestroyImage(RImage *image)
 134 {
 135     assert(image!=NULL);
 136
 137     free(image->data);
 138     free(image);
 139 }
 140
 141
 142 /*
 143  *----------------------------------------------------------------------
 144  * RCombineImages-
 145  *      Combines two equal sized images with alpha image. The second
 146  * image will be placed on top of the first one.
 147  *----------------------------------------------------------------------
 148  */
 149 void
 150 RCombineImages(RImage *image, RImage *src)
 151 {
 152     assert(image->width == src->width);
 153     assert(image->height == src->height);
 154
 155     if (!HAS_ALPHA(src)) {
 156         if (!HAS_ALPHA(image)) {
 157             memcpy(image->data, src->data, image->height*image->width*3);
 158         } else {
 159             int x, y;
 160             unsigned char *d, *s;
 161
 162             d = image->data;
 163             s = src->data;
 164             for (y = 0; y < image->height; y++) {
 165                 for (x = 0; x < image->width; x++) {
 166                     *d++ = *s++;
 167                     *d++ = *s++;
 168                     *d++ = *s++;
 169                     d++;
 170                 }
 171             }
 172         }
 173     } else {
 174         register int i;
 175         unsigned char *d;
 176         unsigned char *s;
 177         int alpha, calpha;
 178
 179         d = image->data;
 180         s = src->data;
 181
 182         if (!HAS_ALPHA(image)) {
 183             for (i=0; i<image->height*image->width; i++) {
 184                 alpha = *(s+3);
 185                 calpha = 255 - alpha;
 186                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
 187                 d++; s++;
 188                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
 189                 d++; s++;
 190                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
 191                 d++; s++;
 192                 s++;
 193             }
 194         } else {
 195             for (i=0; i<image->height*image->width; i++) {
 196                 alpha = *(s+3);
 197                 calpha = 255 - alpha;
 198                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
 199                 d++; s++;
 200                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
 201                 d++; s++;
 202                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
 203                 d++; s++;
 204                 *d++ |= *s++;
 205             }
 206         }
 207     }
 208 }
 209
 210
 211
 212
 213 void
 214 RCombineImagesWithOpaqueness(RImage *image, RImage *src, int opaqueness)
 215 {
 216     register int i;
 217     unsigned char *d;
 218     unsigned char *s;
 219     int c_opaqueness;
 220
 221     assert(image->width == src->width);
 222     assert(image->height == src->height);
 223
 224     d = image->data;
 225     s = src->data;
 226
 227     c_opaqueness = 255 - opaqueness;
 228 #define OP opaqueness
 229     if (!HAS_ALPHA(src)) {
 230         int dalpha = HAS_ALPHA(image);
 231 #define COP c_opaqueness
 232         for (i=0; i < image->width*image->height; i++) {
 233             *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
 234             d++; s++;
 235             *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
 236             d++; s++;
 237             *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
 238             d++; s++;
 239             if (dalpha) {
 240                 d++;
 241             }
 242         }
 243 #undef COP
 244     } else {
 245         int tmp;
 246
 247         if (!HAS_ALPHA(image)) {
 248             for (i=0; i<image->width*image->height; i++) {
 249                 tmp = (*(s+3) * opaqueness)/256;
 250                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
 251                 d++; s++;
 252                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
 253                 d++; s++;
 254                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
 255                 d++; s++;
 256                 s++;
 257             }
 258         } else {
 259             for (i=0; i<image->width*image->height; i++) {
 260                 tmp = (*(s+3) * opaqueness)/256;
 261                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
 262                 d++; s++;
 263                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
 264                 d++; s++;
 265                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
 266                 d++; s++;
 267                 *d |= tmp;
 268                 d++; s++;
 269             }
 270         }
 271     }
 272 #undef OP
 273 }
 274
 275
 276 void
 277 RCombineArea(RImage *image, RImage *src, int sx, int sy, unsigned width,
 278              unsigned height, int dx, int dy)
 279 {
 280     int x, y, dwi, swi;
 281     unsigned char *d;
 282     unsigned char *s;
 283     int alpha, calpha;
 284
 285
 286     assert(dy < image->height);
 287     assert(dx < image->width);
 288
 289     assert(sy + height <= src->height);
 290     assert(sx + width <= src->width);
 291
 292     if (width > image->width - dx)
 293         width = image->width - dx;
 294
 295     if (height > image->height - dy)
 296         height = image->height - dy;
 297
 298     if (!HAS_ALPHA(src)) {
 299         if (!HAS_ALPHA(image)) {
 300             swi = src->width * 3;
 301             dwi = image->width * 3;
 302
 303             s = src->data + (sy*(int)src->width + sx) * 3;
 304             d = image->data + (dy*(int)image->width + dx) * 3;
 305
 306             for (y=0; y < height; y++) {
 307                 memcpy(d, s, width*3);
 308                 d += dwi;
 309                 s += swi;
 310             }
 311         } else {
 312             swi = (src->width - width) * 3;
 313             dwi = (image->width - width) * 4;
 314
 315             s = src->data + (sy*(int)src->width + sx) * 3;
 316             d = image->data + (dy*(int)image->width + dx) * 4;
 317
 318             for (y=0; y < height; y++) {
 319                 for (x=0; x < width; x++) {
 320                     *d++ = *s++;
 321                     *d++ = *s++;
 322                     *d++ = *s++;
 323                     d++;
 324                 }
 325                 d += dwi;
 326                 s += swi;
 327             }
 328         }
 329     } else {
 330         int dalpha = HAS_ALPHA(image);
 331
 332         swi = (src->width - width) * 4;
 333         s = src->data + (sy*(int)src->width + sx) * 4;
 334         if (dalpha) {
 335             dwi = (image->width - width) * 4;
 336             d = image->data + (dy*(int)image->width + dx) * 4;
 337         } else {
 338             dwi = (image->width - width) * 3;
 339             d = image->data + (dy*(int)image->width + dx) * 3;
 340         }
 341
 342         for (y=0; y < height; y++) {
 343             for (x=0; x < width; x++) {
 344                 alpha = *(s+3);
 345                 calpha = 255 - alpha;
 346                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
 347                 s++; d++;
 348                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
 349                 s++; d++;
 350                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
 351                 s++; d++;
 352                 s++;
 353                 if (dalpha)
 354                     d++;
 355             }
 356             d += dwi;
 357             s += swi;
 358         }
 359     }
 360 }
 361
 362
 363 void
 364 RCombineAreaWithOpaqueness(RImage *image, RImage *src, int sx, int sy,
 365                            unsigned width, unsigned height, int dx, int dy,
 366                            int opaqueness)
 367 {
 368     int x, y, dwi, swi;
 369     int c_opaqueness;
 370     unsigned char *d;
 371     unsigned char *s;
 372     int dalpha = HAS_ALPHA(image);
 373     int dch = (dalpha ? 4 : 3);
 374
 375     assert(dy <= image->height);
 376     assert(dx <= image->width);
 377
 378     assert(sy <= height);
 379     assert(sx <= width);
 380
 381
 382     /* clip */
 383     width -= sx;
 384     height -= sy;
 385
 386     if (height > image->height - dy)
 387         height = image->height - dy;
 388
 389     d = image->data + dy*image->width*dch + dx;
 390     dwi = (image->width - width)*dch;
 391
 392     c_opaqueness = 255 - opaqueness;
 393 #define OP opaqueness
 394     if (!HAS_ALPHA(src)) {
 395 #define COP c_opaqueness
 396
 397         s = src->data + sy*src->width*3;
 398         swi = (src->width - width) * 3;
 399
 400         for (y=0; y < height; y++) {
 401             for (x=0; x < width; x++) {
 402                 *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
 403                 s++; d++;
 404                 *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
 405                 s++; d++;
 406                 *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
 407                 s++; d++;
 408                 if (dalpha)
 409                     d++;
 410             }
 411             d += dwi; s += swi;
 412         }
 413 #undef COP
 414     } else {
 415         int tmp;
 416
 417         s = src->data + sy*src->width*4;
 418         swi = (src->width - width) * 4;
 419
 420         for (y=0; y < height; y++) {
 421             for (x=0; x < width; x++) {
 422                 tmp= (*(s+3) * opaqueness)/256;
 423                 *d = (((int)*d *(int)(255-tmp)) + ((int)*s *(int)tmp))/256;
 424                 d++; s++;
 425                 *d = (((int)*d *(int)(255-tmp)) + ((int)*s *(int)tmp))/256;
 426                 d++; s++;
 427                 *d = (((int)*d *(int)(255-tmp)) + ((int)*s *(int)tmp))/256;
 428                 d++; s++;
 429                 s++;
 430                 if (dalpha)
 431                     d++;
 432             }
 433             d += dwi; s += swi;
 434         }
 435     }
 436 #undef OP
 437 }
 438
 439
 440
 441 void
 442 RCombineImageWithColor(RImage *image, RColor *color)
 443 {
 444     register int i;
 445     unsigned char *d;
 446     int alpha, nalpha, r, g, b;
 447
 448     d = image->data;
 449
 450     if (!HAS_ALPHA(image)) {
 451         /* Image has no alpha channel, so we consider it to be all 255.
 452          * Thus there are no transparent parts to be filled. */
 453         return;
 454     }
 455     r = color->red;
 456     g = color->green;
 457     b = color->blue;
 458
 459     for (i=0; i < image->width*image->height; i++) {
 460         alpha = *(d+3);
 461         nalpha = 255 - alpha;
 462
 463         *d = (((int)*d * alpha) + (r * nalpha))/256;
 464         d++;
 465         *d = (((int)*d * alpha) + (g * nalpha))/256;
 466         d++;
 467         *d = (((int)*d * alpha) + (b * nalpha))/256;
 468         d++;
 469         d++;
 470     }
 471 }
 472
 473
 474
 475
 476 RImage*
 477 RMakeTiledImage(RImage *tile, unsigned width, unsigned height)
 478 {
 479     int x, y;
 480     unsigned w;
 481     unsigned long tile_size = tile->width * tile->height;
 482     unsigned long tx = 0;
 483     RImage *image;
 484     unsigned char *s, *d;
 485
 486     if (width == tile->width && height == tile->height)
 487         image = RCloneImage(tile);
 488     else if (width <= tile->width && height <= tile->height)
 489         image = RGetSubImage(tile, 0, 0, width, height);
 490     else {
 491         int has_alpha = HAS_ALPHA(tile);
 492
 493         image = RCreateImage(width, height, has_alpha);
 494
 495         d = image->data;
 496         s = tile->data;
 497
 498         for (y = 0; y < height; y++) {
 499             for (x = 0; x < width; x += tile->width) {
 500
 501                 w = (width - x < tile->width) ? width - x : tile->width;
 502
 503                 if (has_alpha) {
 504                     w *= 4;
 505                     memcpy(d, s+tx*4, w);
 506                 } else {
 507                     w *= 3;
 508                     memcpy(d, s+tx*3, w);
 509                 }
 510                 d += w;
 511             }
 512
 513             tx = (tx + tile->width) % tile_size;
 514         }
 515     }
 516     return image;
 517 }
 518
 519
 520 RImage*
 521 RMakeCenteredImage(RImage *image, unsigned width, unsigned height, RColor *color)
 522 {
 523     int x, y, w, h, sx, sy;
 524     RImage *tmp;
 525
 526     tmp = RCreateImage(width, height, False);
 527     if (!tmp) {
 528         return NULL;
 529     }
 530
 531     RClearImage(tmp, color);
 532
 533     if (image->height < height) {
 534         h = image->height;
 535         y = (height - h)/2;
 536         sy = 0;
 537     } else {
 538         sy = (image->height - height)/2;
 539         y = 0;
 540         h = height;
 541     }
 542     if (image->width < width) {
 543         w = image->width;
 544         x = (width - w)/2;
 545         sx = 0;
 546     } else {
 547         sx = (image->width - width)/2;
 548         x = 0;
 549         w = width;
 550     }
 551     RCombineArea(tmp, image, sx, sy, w, h, x, y);
 552
 553     return tmp;
 554 }