wrlib/raster.c

   1 /* raster.c - main and other misc stuff
   2  *
   3  * Raster graphics library
   4  *
   5  * Copyright (c) 1997-2003 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 #define MAX_WIDTH 20000
  42 #define MAX_HEIGHT 20000
  43 /* 20000^2*4 < 2G */
  44
  45
  46 RImage*
  47 RCreateImage(unsigned width, unsigned height, int alpha)
  48 {
  49     RImage *image=NULL;
  50
  51     assert(width>0 && height>0);
  52
  53     if (width > MAX_WIDTH || height > MAX_HEIGHT) {
  54         RErrorCode = RERR_NOMEMORY;
  55         return NULL;
  56     }
  57
  58     image = malloc(sizeof(RImage));
  59     if (!image) {
  60         RErrorCode = RERR_NOMEMORY;
  61         return NULL;
  62     }
  63
  64     memset(image, 0, sizeof(RImage));
  65     image->width = width;
  66     image->height = height;
  67     image->format = alpha ? RRGBAFormat : RRGBFormat;
  68     image->refCount = 1;
  69
  70     /* the +4 is to give extra bytes at the end of the buffer,
  71      * so that we can optimize image conversion for MMX(tm).. see convert.c
  72      */
  73     image->data = malloc(width * height * (alpha ? 4 : 3) + 4);
  74     if (!image->data) {
  75         RErrorCode = RERR_NOMEMORY;
  76         free(image);
  77         image = NULL;
  78     }
  79
  80     return image;
  81
  82 }
  83
  84
  85 RImage*
  86 RRetainImage(RImage *image)
  87 {
  88     if (image)
  89         image->refCount++;
  90
  91     return image;
  92 }
  93
  94
  95 void
  96 RReleaseImage(RImage *image)
  97 {
  98     assert(image!=NULL);
  99
 100     image->refCount--;
 101
 102     if (image->refCount < 1) {
 103         free(image->data);
 104         free(image);
 105     }
 106 }
 107
 108
 109 RImage*
 110 RCloneImage(RImage *image)
 111 {
 112     RImage *new_image;
 113
 114     assert(image!=NULL);
 115
 116     new_image = RCreateImage(image->width, image->height, HAS_ALPHA(image));
 117     if (!new_image)
 118       return NULL;
 119
 120     new_image->background = image->background;
 121     memcpy(new_image->data, image->data,
 122            image->width*image->height*(HAS_ALPHA(image) ? 4 : 3));
 123
 124     return new_image;
 125 }
 126
 127
 128 RImage*
 129 RGetSubImage(RImage *image, int x, int y, unsigned width, unsigned height)
 130 {
 131     int i, ofs;
 132     RImage *new_image;
 133     unsigned total_line_size, line_size;
 134
 135     assert(image!=NULL);
 136     assert(x>=0 && y>=0);
 137     assert(x<image->width && y<image->height);
 138     assert(width>0 && height>0);
 139
 140     if (x+width > image->width)
 141         width = image->width-x;
 142     if (y+height > image->height)
 143         height = image->height-y;
 144
 145     new_image = RCreateImage(width, height, HAS_ALPHA(image));
 146
 147     if (!new_image)
 148         return NULL;
 149     new_image->background = image->background;
 150
 151     total_line_size = image->width * (HAS_ALPHA(image) ? 4 : 3);
 152     line_size = width * (HAS_ALPHA(image) ? 4 : 3);
 153
 154     ofs = x*(HAS_ALPHA(image) ? 4 : 3) + y*total_line_size;;
 155
 156     for (i=0; i<height; i++) {
 157         memcpy(&new_image->data[i*line_size],
 158                &image->data[i*total_line_size+ofs], line_size);
 159     }
 160     return new_image;
 161 }
 162
 163
 164 /*
 165  *----------------------------------------------------------------------
 166  * RCombineImages-
 167  *      Combines two equal sized images with alpha image. The second
 168  * image will be placed on top of the first one.
 169  *----------------------------------------------------------------------
 170  */
 171 void
 172 RCombineImages(RImage *image, RImage *src)
 173 {
 174     assert(image->width == src->width);
 175     assert(image->height == src->height);
 176
 177     if (!HAS_ALPHA(src)) {
 178         if (!HAS_ALPHA(image)) {
 179             memcpy(image->data, src->data, image->height*image->width*3);
 180         } else {
 181             int x, y;
 182             unsigned char *d, *s;
 183
 184             d = image->data;
 185             s = src->data;
 186             for (y = 0; y < image->height; y++) {
 187                 for (x = 0; x < image->width; x++) {
 188                     *d++ = *s++;
 189                     *d++ = *s++;
 190                     *d++ = *s++;
 191                     d++;
 192                 }
 193             }
 194         }
 195     } else {
 196         register int i;
 197         unsigned char *d;
 198         unsigned char *s;
 199         int alpha, calpha;
 200
 201         d = image->data;
 202         s = src->data;
 203
 204         if (!HAS_ALPHA(image)) {
 205             for (i=0; i<image->height*image->width; i++) {
 206                 alpha = *(s+3);
 207                 calpha = 255 - alpha;
 208                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256; d++; s++;
 209                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256; d++; s++;
 210                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256; d++; s++;
 211                 s++;
 212             }
 213         } else {
 214             for (i=0; i<image->height*image->width; i++) {
 215                 alpha = *(s+3);
 216                 calpha = 255 - alpha;
 217                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256; d++; s++;
 218                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256; d++; s++;
 219                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256; d++; s++;
 220                 *d++ |= *s++;
 221             }
 222         }
 223     }
 224 }
 225
 226
 227
 228
 229 void
 230 RCombineImagesWithOpaqueness(RImage *image, RImage *src, int opaqueness)
 231 {
 232     register int i;
 233     unsigned char *d;
 234     unsigned char *s;
 235     int c_opaqueness;
 236
 237     assert(image->width == src->width);
 238     assert(image->height == src->height);
 239
 240     d = image->data;
 241     s = src->data;
 242
 243     c_opaqueness = 255 - opaqueness;
 244
 245 #define OP opaqueness
 246 #define COP c_opaqueness
 247
 248     if (!HAS_ALPHA(src)) {
 249         int dalpha = HAS_ALPHA(image);
 250         for (i=0; i < image->width*image->height; i++) {
 251             *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256; d++; s++;
 252             *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256; d++; s++;
 253             *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256; d++; s++;
 254             if (dalpha) {
 255                 d++;
 256             }
 257         }
 258     } else {
 259         int tmp;
 260
 261         if (!HAS_ALPHA(image)) {
 262             for (i=0; i<image->width*image->height; i++) {
 263                 tmp = (*(s+3) * opaqueness)/256;
 264                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256; d++; s++;
 265                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256; d++; s++;
 266                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256; d++; s++;
 267                 s++;
 268             }
 269         } else {
 270             for (i=0; i<image->width*image->height; i++) {
 271                 tmp = (*(s+3) * opaqueness)/256;
 272                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256; d++; s++;
 273                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256; d++; s++;
 274                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256; d++; s++;
 275                 *d |= tmp;
 276                 d++; s++;
 277             }
 278         }
 279     }
 280 #undef OP
 281 #undef COP
 282 }
 283
 284 int
 285 calculateCombineArea(RImage *des, RImage *src, int *sx, int *sy,
 286                      int *swidth, int *sheight, int *dx, int *dy)
 287 {
 288     if (*dx < 0) {
 289         *sx = -*dx;
 290         *swidth = *swidth + *dx;
 291         *dx = 0;
 292     }
 293
 294     if (*dx + *swidth > des->width) {
 295         *swidth = des->width - *dx;
 296     }
 297
 298     if (*dy < 0) {
 299         *sy = -*dy;
 300         *sheight = *sheight + *dy;
 301         *dy = 0;
 302     }
 303
 304     if (*dy + *sheight > des->height) {
 305         *sheight = des->height - *dy;
 306     }
 307
 308     if (*sheight > 0 && *swidth > 0) {
 309         return True;
 310     } else return False;
 311 }
 312
 313 void
 314 RCombineArea(RImage *image, RImage *src, int sx, int sy, unsigned width,
 315              unsigned height, int dx, int dy)
 316 {
 317     int x, y, dwi, swi;
 318     unsigned char *d;
 319     unsigned char *s;
 320     int alpha, calpha;
 321
 322     if(!calculateCombineArea(image, src, &sx, &sy, &width, &height, &dx, &dy))
 323         return;
 324
 325     if (!HAS_ALPHA(src)) {
 326         if (!HAS_ALPHA(image)) {
 327             swi = src->width * 3;
 328             dwi = image->width * 3;
 329
 330             s = src->data + (sy*(int)src->width + sx) * 3;
 331             d = image->data + (dy*(int)image->width + dx) * 3;
 332
 333             for (y=0; y < height; y++) {
 334                 memcpy(d, s, width*3);
 335                 d += dwi;
 336                 s += swi;
 337             }
 338         } else {
 339             swi = (src->width - width) * 3;
 340             dwi = (image->width - width) * 4;
 341
 342             s = src->data + (sy*(int)src->width + sx) * 3;
 343             d = image->data + (dy*(int)image->width + dx) * 4;
 344
 345             for (y=0; y < height; y++) {
 346                 for (x=0; x < width; x++) {
 347                     *d++ = *s++;
 348                     *d++ = *s++;
 349                     *d++ = *s++;
 350                     d++;
 351                 }
 352                 d += dwi;
 353                 s += swi;
 354             }
 355         }
 356     } else {
 357         int dalpha = HAS_ALPHA(image);
 358
 359         swi = (src->width - width) * 4;
 360         s = src->data + (sy*(int)src->width + sx) * 4;
 361         if (dalpha) {
 362             dwi = (image->width - width) * 4;
 363             d = image->data + (dy*(int)image->width + dx) * 4;
 364         } else {
 365             dwi = (image->width - width) * 3;
 366             d = image->data + (dy*(int)image->width + dx) * 3;
 367         }
 368
 369         for (y=0; y < height; y++) {
 370             for (x=0; x < width; x++) {
 371                 alpha = *(s+3);
 372                 calpha = 255 - alpha;
 373                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256; s++; d++;
 374                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256; s++; d++;
 375                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256; s++; d++;
 376                 s++;
 377                 if (dalpha)
 378                     d++;
 379             }
 380             d += dwi;
 381             s += swi;
 382         }
 383     }
 384 }
 385
 386
 387 void
 388 RCombineAreaWithOpaqueness(RImage *image, RImage *src, int sx, int sy,
 389                            unsigned width, unsigned height, int dx, int dy,
 390                            int opaqueness)
 391 {
 392     int x, y, dwi, swi;
 393     int c_opaqueness;
 394     unsigned char *s, *d;
 395     int dalpha = HAS_ALPHA(image);
 396     int dch = (dalpha ? 4 : 3);
 397
 398     if(!calculateCombineArea(image, src, &sx, &sy, &width, &height, &dx, &dy))
 399         return;
 400
 401     d = image->data + (dy*image->width + dx) * dch;
 402     dwi = (image->width - width)*dch;
 403
 404     c_opaqueness = 255 - opaqueness;
 405
 406 #define OP opaqueness
 407 #define COP c_opaqueness
 408
 409     if (!HAS_ALPHA(src)) {
 410
 411         s = src->data + (sy*src->width + sx)*3;
 412         swi = (src->width - width) * 3;
 413
 414         for (y=0; y < height; y++) {
 415             for (x=0; x < width; x++) {
 416                 *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256; s++; d++;
 417                 *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256; s++; d++;
 418                 *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256; s++; d++;
 419                 if (dalpha)
 420                     d++;
 421             }
 422             d += dwi; s += swi;
 423         }
 424     } else {
 425         int tmp;
 426
 427         s = src->data + (sy*src->width + sx)*4;
 428         swi = (src->width - width) * 4;
 429
 430         for (y=0; y < height; y++) {
 431             for (x=0; x < width; x++) {
 432                 tmp = (*(s+3) * opaqueness)/256;
 433                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256; d++; s++;
 434                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256; d++; s++;
 435                 *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256; d++; s++;
 436                 s++;
 437                 if (dalpha)
 438                     d++;
 439             }
 440             d += dwi; s += swi;
 441         }
 442     }
 443 #undef OP
 444 #undef COP
 445 }
 446
 447
 448
 449 void
 450 RCombineImageWithColor(RImage *image, RColor *color)
 451 {
 452     register int i;
 453     unsigned char *d;
 454     int alpha, nalpha, r, g, b;
 455
 456     d = image->data;
 457
 458     if (!HAS_ALPHA(image)) {
 459         /* Image has no alpha channel, so we consider it to be all 255.
 460          * Thus there are no transparent parts to be filled. */
 461         return;
 462     }
 463     r = color->red;
 464     g = color->green;
 465     b = color->blue;
 466
 467     for (i=0; i < image->width*image->height; i++) {
 468         alpha = *(d+3);
 469         nalpha = 255 - alpha;
 470
 471         *d = (((int)*d * alpha) + (r * nalpha))/256; d++;
 472         *d = (((int)*d * alpha) + (g * nalpha))/256; d++;
 473         *d = (((int)*d * alpha) + (b * nalpha))/256; d++;
 474         d++;
 475     }
 476 }
 477
 478
 479
 480
 481 RImage*
 482 RMakeTiledImage(RImage *tile, unsigned width, unsigned height)
 483 {
 484     int x, y;
 485     unsigned w;
 486     unsigned long tile_size = tile->width * tile->height;
 487     unsigned long tx = 0;
 488     RImage *image;
 489     unsigned char *s, *d;
 490
 491     if (width == tile->width && height == tile->height)
 492         image = RCloneImage(tile);
 493     else if (width <= tile->width && height <= tile->height)
 494         image = RGetSubImage(tile, 0, 0, width, height);
 495     else {
 496         int has_alpha = HAS_ALPHA(tile);
 497
 498         image = RCreateImage(width, height, has_alpha);
 499
 500         d = image->data;
 501         s = tile->data;
 502
 503         for (y = 0; y < height; y++) {
 504             for (x = 0; x < width; x += tile->width) {
 505
 506                 w = (width - x < tile->width) ? width - x : tile->width;
 507
 508                 if (has_alpha) {
 509                     w *= 4;
 510                     memcpy(d, s+tx*4, w);
 511                 } else {
 512                     w *= 3;
 513                     memcpy(d, s+tx*3, w);
 514                 }
 515                 d += w;
 516             }
 517
 518             tx = (tx + tile->width) % tile_size;
 519         }
 520     }
 521     return image;
 522 }
 523
 524
 525 RImage*
 526 RMakeCenteredImage(RImage *image, unsigned width, unsigned height, RColor *color)
 527 {
 528     int x, y, w, h, sx, sy;
 529     RImage *tmp;
 530
 531     tmp = RCreateImage(width, height, False);
 532     if (!tmp) {
 533         return NULL;
 534     }
 535
 536     RClearImage(tmp, color);
 537
 538     if (image->height < height) {
 539         h = image->height;
 540         y = (height - h)/2;
 541         sy = 0;
 542     } else {
 543         sy = (image->height - height)/2;
 544         y = 0;
 545         h = height;
 546     }
 547     if (image->width < width) {
 548         w = image->width;
 549         x = (width - w)/2;
 550         sx = 0;
 551     } else {
 552         sx = (image->width - width)/2;
 553         x = 0;
 554         w = width;
 555     }
 556     RCombineArea(tmp, image, sx, sy, w, h, x, y);
 557
 558     return tmp;
 559 }