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
 293     if (height > image->height - dy)
 294         height = image->height - dy;
 295
 296     if (!HAS_ALPHA(src)) {
 297         if (!HAS_ALPHA(image)) {
 298             swi = (src->width - width) * 3;
 299             dwi = (image->width - width) * 3;
 300
 301             d = image->data + dy*(int)image->width*3 + dx;
 302             s = src->data + sy*(int)src->width*3 + sx;
 303
 304             for (y=0; y < height; y++) {
 305                 memcpy(d, s, width*3);
 306                 d += dwi;
 307                 s += swi;
 308             }
 309         } else {
 310             swi = (src->width - width) * 3;
 311             dwi = (image->width - width) * 4;
 312
 313             d = image->data + dy*(int)image->width*4 + dx;
 314             s = src->data + sy*(int)src->width*3 + sx;
 315
 316             for (y=0; y < height; y++) {
 317                 for (x=0; x < width; x++) {
 318                     *d++ = *s++;
 319                     *d++ = *s++;
 320                     *d++ = *s++;
 321                     d++;
 322                 }
 323                 d += dwi;
 324                 s += swi;
 325             }
 326         }
 327     } else {
 328         int dalpha = HAS_ALPHA(image);
 329
 330         swi = (src->width - width) * 4;
 331         s = src->data + sy*(int)src->width*4 + sx;
 332         if (!HAS_ALPHA(image)) {
 333             dwi = (image->width - width) * 3;
 334             d = image->data + (dy*(int)image->width+dx)*3;
 335         } else {
 336             dwi = (image->width - width) * 4;
 337             d = image->data + (dy*(int)image->width+dx)*4;
 338         }
 339
 340         for (y=0; y < height; y++) {
 341             for (x=0; x < width; x++) {
 342                 alpha = *(s+3);
 343                 calpha = 255 - alpha;
 344                 *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
 345                 s++; d++;
 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                 s++;
 351                 if (dalpha)
 352                     d++;
 353             }
 354             d += dwi;
 355             s += swi;
 356         }
 357     }
 358 }
 359
 360
 361 void
 362 RCombineAreaWithOpaqueness(RImage *image, RImage *src, int sx, int sy,
 363                            unsigned width, unsigned height, int dx, int dy,
 364                            int opaqueness)
 365 {
 366     int x, y, dwi, swi;
 367     int c_opaqueness;
 368     unsigned char *d;
 369     unsigned char *s;
 370     int dalpha = HAS_ALPHA(image);
 371     int dch = (dalpha ? 4 : 3);
 372
 373     assert(dy <= image->height);
 374     assert(dx <= image->width);
 375
 376     assert(sy <= height);
 377     assert(sx <= width);
 378
 379
 380     /* clip */
 381     width -= sx;
 382     height -= sy;
 383
 384     if (height > image->height - dy)
 385         height = image->height - dy;
 386
 387     d = image->data + dy*image->width*dch + dx;
 388     dwi = (image->width - width)*dch;
 389
 390     c_opaqueness = 255 - opaqueness;
 391 #define OP opaqueness
 392     if (!HAS_ALPHA(src)) {
 393 #define COP c_opaqueness
 394
 395         s = src->data + sy*src->width*3;
 396         swi = (src->width - width) * 3;
 397
 398         for (y=0; y < height; y++) {
 399             for (x=0; x < width; x++) {
 400                 *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
 401                 s++; d++;
 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                 if (dalpha)
 407                     d++;
 408             }
 409             d += dwi; s += swi;
 410         }
 411 #undef COP
 412     } else {
 413         int tmp;
 414
 415         s = src->data + sy*src->width*4;
 416         swi = (src->width - width) * 4;
 417
 418         for (y=0; y < height; y++) {
 419             for (x=0; x < width; x++) {
 420                 tmp= (*(s+3) * opaqueness)/256;
 421                 *d = (((int)*d *(int)(255-tmp)) + ((int)*s *(int)tmp))/256;
 422                 d++; s++;
 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                 s++;
 428                 if (dalpha)
 429                     d++;
 430             }
 431             d += dwi; s += swi;
 432         }
 433     }
 434 #undef OP
 435 }
 436
 437
 438
 439
 440 void
 441 RCombineImageWithColor(RImage *image, RColor *color)
 442 {
 443     register int i;
 444     unsigned char *d;
 445     int alpha, nalpha, r, g, b;
 446
 447     d = image->data;
 448
 449     if (!HAS_ALPHA(image)) {
 450         /* Image has no alpha channel, so we consider it to be all 255.
 451          * Thus there are no transparent parts to be filled. */
 452         return;
 453     }
 454     r = color->red;
 455     g = color->green;
 456     b = color->blue;
 457
 458     for (i=0; i < image->width*image->height; i++) {
 459         alpha = *(d+3);
 460         nalpha = 255 - alpha;
 461
 462         *d = (((int)*d * alpha) + (r * nalpha))/256;
 463         d++;
 464         *d = (((int)*d * alpha) + (g * nalpha))/256;
 465         d++;
 466         *d = (((int)*d * alpha) + (b * nalpha))/256;
 467         d++;
 468         d++;
 469     }
 470 }
 471
 472
 473
 474
 475 RImage*
 476 RMakeTiledImage(RImage *tile, unsigned width, unsigned height)
 477 {
 478     int x, y;
 479     unsigned w;
 480     unsigned long tile_size = tile->width * tile->height;
 481     unsigned long tx = 0;
 482     RImage *image;
 483     unsigned char *s, *d;
 484
 485     if (width == tile->width && height == tile->height)
 486         image = RCloneImage(tile);
 487     else if (width <= tile->width && height <= tile->height)
 488         image = RGetSubImage(tile, 0, 0, width, height);
 489     else {
 490         int has_alpha = HAS_ALPHA(tile);
 491
 492         image = RCreateImage(width, height, has_alpha);
 493
 494         d = image->data;
 495         s = tile->data;
 496
 497         for (y = 0; y < height; y++) {
 498             for (x = 0; x < width; x += tile->width) {
 499
 500                 w = (width - x < tile->width) ? width - x : tile->width;
 501
 502                 if (has_alpha) {
 503                     w *= 4;
 504                     memcpy(d, s+tx*4, w);
 505                 } else {
 506                     w *= 3;
 507                     memcpy(d, s+tx*3, w);
 508                 }
 509                 d += w;
 510             }
 511
 512             tx = (tx + tile->width) % tile_size;
 513         }
 514     }
 515     return image;
 516 }
 517
 518
 519 RImage*
 520 RMakeCenteredImage(RImage *image, unsigned width, unsigned height, RColor *color)
 521 {
 522     int x, y, w, h, sx, sy;
 523     RImage *tmp;
 524
 525     tmp = RCreateImage(width, height, False);
 526     if (!tmp) {
 527         return NULL;
 528     }
 529
 530     RClearImage(tmp, color);
 531
 532     if (image->height < height) {
 533         h = image->height;
 534         y = (height - h)/2;
 535         sy = 0;
 536     } else {
 537         sy = (image->height - height)/2;
 538         y = 0;
 539         h = height;
 540     }
 541     if (image->width < width) {
 542         w = image->width;
 543         x = (width - w)/2;
 544         sx = 0;
 545     } else {
 546         sx = (image->width - width)/2;
 547         x = 0;
 548         w = width;
 549     }
 550     RCombineArea(tmp, image, sx, sy, w, h, x, y);
 551
 552     return tmp;
 553 }