src/pixbuf_util.c

   1 /*
   2  * Geeqie
   3  * (C) 2004 John Ellis
   4  * Copyright (C) 2008 The Geeqie Team
   5  *
   6  * Author: John Ellis
   7  *
   8  * This software is released under the GNU General Public License (GNU GPL).
   9  * Please read the included file COPYING for more information.
  10  * This software comes with no warranty of any kind, use at your own risk!
  11  */
  12
  13
  14 #include "main.h"
  15 #include "pixbuf_util.h"
  16 #include "exif.h"
  17
  18 #include "icons/icons_inline.h"
  19
  20 #include <math.h>
  21
  22
  23 /*
  24  *-----------------------------------------------------------------------------
  25  * png save
  26  *-----------------------------------------------------------------------------
  27  */
  28
  29 gboolean pixbuf_to_file_as_png(GdkPixbuf *pixbuf, const gchar *filename)
  30 {
  31         GError *error = NULL;
  32         gint ret;
  33
  34         if (!pixbuf || !filename) return FALSE;
  35
  36         ret = gdk_pixbuf_save(pixbuf, filename, "png", &error,
  37                               "tEXt::Software", GQ_APPNAME " " VERSION, NULL);
  38
  39         if (error)
  40                 {
  41                 log_printf("Error saving png file: %s\n", error->message);
  42                 g_error_free(error);
  43                 }
  44
  45         return ret;
  46 }
  47
  48 /*
  49  *-----------------------------------------------------------------------------
  50  * jpeg save
  51  *-----------------------------------------------------------------------------
  52  */
  53
  54 gboolean pixbuf_to_file_as_jpg(GdkPixbuf *pixbuf, const gchar *filename, gint quality)
  55 {
  56         GError *error = NULL;
  57         gchar *qbuf;
  58         gboolean ret;
  59
  60         if (!pixbuf || !filename) return FALSE;
  61
  62         if (quality == -1) quality = 75;
  63         if (quality < 1 || quality > 100)
  64                 {
  65                 log_printf("Jpeg not saved, invalid quality %d\n", quality);
  66                 return FALSE;
  67                 }
  68
  69         qbuf = g_strdup_printf("%d", quality);
  70         ret = gdk_pixbuf_save(pixbuf, filename, "jpeg", &error, "quality", qbuf, NULL);
  71         g_free(qbuf);
  72
  73         if (error)
  74                 {
  75                 log_printf("Error saving jpeg to %s\n%s\n", filename, error->message);
  76                 g_error_free(error);
  77                 }
  78
  79         return ret;
  80 }
  81
  82 /*
  83  *-----------------------------------------------------------------------------
  84  * pixbuf from inline
  85  *-----------------------------------------------------------------------------
  86  */
  87
  88 typedef struct _PixbufInline PixbufInline;
  89 struct _PixbufInline
  90 {
  91         const gchar *key;
  92         const guint8 *data;
  93 };
  94
  95 static PixbufInline inline_pixbuf_data[] = {
  96         { PIXBUF_INLINE_FOLDER_CLOSED,  folder_closed },
  97         { PIXBUF_INLINE_FOLDER_LOCKED,  folder_locked },
  98         { PIXBUF_INLINE_FOLDER_OPEN,    folder_open },
  99         { PIXBUF_INLINE_FOLDER_UP,      folder_up },
 100         { PIXBUF_INLINE_SCROLLER,       icon_scroller },
 101         { PIXBUF_INLINE_BROKEN,         icon_broken },
 102         { PIXBUF_INLINE_ICON,           gqview_icon },
 103         { PIXBUF_INLINE_LOGO,           geeqie_logo },
 104         { PIXBUF_INLINE_ICON_FLOAT,     icon_float },
 105         { PIXBUF_INLINE_ICON_THUMB,     icon_thumb },
 106         { PIXBUF_INLINE_ICON_BOOK,      icon_book },
 107         { PIXBUF_INLINE_ICON_CONFIG,    icon_config },
 108         { PIXBUF_INLINE_ICON_TOOLS,     icon_tools },
 109         { PIXBUF_INLINE_ICON_VIEW,      icon_view },
 110         { NULL, NULL }
 111 };
 112
 113 GdkPixbuf *pixbuf_inline(const gchar *key)
 114 {
 115         gint i;
 116
 117         if (!key) return NULL;
 118
 119         i = 0;
 120         while (inline_pixbuf_data[i].key)
 121                 {
 122                 if (strcmp(inline_pixbuf_data[i].key, key) == 0)
 123                         {
 124                         return gdk_pixbuf_new_from_inline(-1, inline_pixbuf_data[i].data, FALSE, NULL);
 125                         }
 126                 i++;
 127                 }
 128
 129         log_printf("warning: inline pixbuf key \"%s\" not found.\n", key);
 130
 131         return NULL;
 132 }
 133
 134 gint pixbuf_scale_aspect(gint req_w, gint req_h, gint old_w, gint old_h,
 135                                           gint *new_w, gint *new_h)
 136 {
 137         if (((gdouble)req_w / old_w) < ((gdouble)req_h / old_h))
 138                 {
 139                 *new_w = req_w;
 140                 *new_h = (gdouble)*new_w / old_w * old_h;
 141                 if (*new_h < 1) *new_h = 1;
 142                 }
 143         else
 144                 {
 145                 *new_h = req_h;
 146                 *new_w = (gdouble)*new_h / old_h * old_w;
 147                 if (*new_w < 1) *new_w = 1;
 148                 }
 149
 150         return (*new_w != old_w || *new_h != old_h);
 151 }
 152
 153 GdkPixbuf *pixbuf_fallback(FileData *fd, gint requested_width, gint requested_height)
 154 {
 155         GdkPixbuf *pixbuf = pixbuf_inline(PIXBUF_INLINE_BROKEN); /* FIXME use different images according to FORMAT_CLASS */
 156
 157         if (requested_width && requested_height)
 158                 {
 159                 gint w = gdk_pixbuf_get_width(pixbuf);
 160                 gint h = gdk_pixbuf_get_height(pixbuf);
 161
 162                 if (w > requested_width || h > requested_height)
 163                         {
 164                         gint nw, nh;
 165
 166                         if (pixbuf_scale_aspect(requested_width, requested_height,
 167                                                           w, h, &nw, &nh))
 168                                 {
 169                                 GdkPixbuf *tmp;
 170
 171                                 tmp = pixbuf;
 172                                 pixbuf = gdk_pixbuf_scale_simple(tmp, nw, nh, GDK_INTERP_TILES);
 173                                 g_object_unref(G_OBJECT(tmp));
 174                                 }
 175                         }
 176                 }
 177         return pixbuf;
 178 }
 179
 180
 181 /*
 182  *-----------------------------------------------------------------------------
 183  * misc utils
 184  *-----------------------------------------------------------------------------
 185  */
 186
 187 gint util_clip_region(gint x, gint y, gint w, gint h,
 188                       gint clip_x, gint clip_y, gint clip_w, gint clip_h,
 189                       gint *rx, gint *ry, gint *rw, gint *rh)
 190 {
 191         if (clip_x + clip_w <= x ||
 192             clip_x >= x + w ||
 193             clip_y + clip_h <= y ||
 194             clip_y >= y + h)
 195                 {
 196                 return FALSE;
 197                 }
 198
 199         *rx = MAX(x, clip_x);
 200         *rw = MIN((x + w), (clip_x + clip_w)) - *rx;
 201
 202         *ry = MAX(y, clip_y);
 203         *rh = MIN((y + h), (clip_y + clip_h)) - *ry;
 204
 205         return TRUE;
 206 }
 207
 208 /*
 209  *-----------------------------------------------------------------------------
 210  * pixbuf rotation
 211  *-----------------------------------------------------------------------------
 212  */
 213
 214 static void pixbuf_copy_block_rotate(guchar *src, gint src_row_stride, gint x, gint y,
 215                                      guchar *dest, gint dest_row_stride, gint w, gint h,
 216                                      gint bytes_per_pixel, gint counter_clockwise)
 217 {
 218         gint i, j;
 219         guchar *sp;
 220         guchar *dp;
 221
 222         for (i = 0; i < h; i++)
 223                 {
 224                 sp = src + ((i + y) * src_row_stride) + (x * bytes_per_pixel);
 225                 for (j = 0; j < w; j++)
 226                         {
 227                         if (counter_clockwise)
 228                                 {
 229                                 dp = dest + ((w - j - 1) * dest_row_stride) + (i * bytes_per_pixel);
 230                                 }
 231                         else
 232                                 {
 233                                 dp = dest + (j * dest_row_stride) + ((h - i - 1) * bytes_per_pixel);
 234                                 }
 235                         *(dp++) = *(sp++);      /* r */
 236                         *(dp++) = *(sp++);      /* g */
 237                         *(dp++) = *(sp++);      /* b */
 238                         if (bytes_per_pixel == 4) *(dp) = *(sp++);      /* a */
 239                         }
 240                 }
 241
 242 }
 243
 244 static void pixbuf_copy_block(guchar *src, gint src_row_stride, gint w, gint h,
 245                               guchar *dest, gint dest_row_stride, gint x, gint y, gint bytes_per_pixel)
 246 {
 247         gint i;
 248         guchar *sp;
 249         guchar *dp;
 250
 251         for (i = 0; i < h; i++)
 252                 {
 253                 sp = src + (i * src_row_stride);
 254                 dp = dest + ((y + i) * dest_row_stride) + (x * bytes_per_pixel);
 255                 memcpy(dp, sp, w * bytes_per_pixel);
 256                 }
 257 }
 258
 259 #define ROTATE_BUFFER_WIDTH 48
 260 #define ROTATE_BUFFER_HEIGHT 48
 261
 262 /*
 263  * Returns a copy of pixbuf src rotated 90 degrees clockwise or 90 counterclockwise
 264  *
 265  */
 266 GdkPixbuf *pixbuf_copy_rotate_90(GdkPixbuf *src, gint counter_clockwise)
 267 {
 268         GdkPixbuf *dest;
 269         gint has_alpha;
 270         gint sw, sh, srs;
 271         gint dw, dh, drs;
 272         guchar *s_pix;
 273         guchar *d_pix;
 274 #if 0
 275         guchar *sp;
 276         guchar *dp;
 277 #endif
 278         gint i, j;
 279         gint a;
 280         GdkPixbuf *buffer;
 281         guchar *b_pix;
 282         gint brs;
 283         gint w, h;
 284
 285         if (!src) return NULL;
 286
 287         sw = gdk_pixbuf_get_width(src);
 288         sh = gdk_pixbuf_get_height(src);
 289         has_alpha = gdk_pixbuf_get_has_alpha(src);
 290         srs = gdk_pixbuf_get_rowstride(src);
 291         s_pix = gdk_pixbuf_get_pixels(src);
 292
 293         dw = sh;
 294         dh = sw;
 295         dest = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8, dw, dh);
 296         drs = gdk_pixbuf_get_rowstride(dest);
 297         d_pix = gdk_pixbuf_get_pixels(dest);
 298
 299         a = (has_alpha ? 4 : 3);
 300
 301         buffer = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8,
 302                                 ROTATE_BUFFER_WIDTH, ROTATE_BUFFER_HEIGHT);
 303         b_pix = gdk_pixbuf_get_pixels(buffer);
 304         brs = gdk_pixbuf_get_rowstride(buffer);
 305
 306         for (i = 0; i < sh; i+= ROTATE_BUFFER_WIDTH)
 307                 {
 308                 w = MIN(ROTATE_BUFFER_WIDTH, (sh - i));
 309                 for (j = 0; j < sw; j += ROTATE_BUFFER_HEIGHT)
 310                         {
 311                         gint x, y;
 312
 313                         h = MIN(ROTATE_BUFFER_HEIGHT, (sw - j));
 314                         pixbuf_copy_block_rotate(s_pix, srs, j, i,
 315                                                  b_pix, brs, h, w,
 316                                                  a, counter_clockwise);
 317
 318                         if (counter_clockwise)
 319                                 {
 320                                 x = i;
 321                                 y = sw - h - j;
 322                                 }
 323                         else
 324                                 {
 325                                 x = sh - w - i;
 326                                 y = j;
 327                                 }
 328                         pixbuf_copy_block(b_pix, brs, w, h,
 329                                           d_pix, drs, x, y, a);
 330                         }
 331                 }
 332
 333         gdk_pixbuf_unref(buffer);
 334
 335 #if 0
 336         /* this is the simple version of rotation (roughly 2-4x slower) */
 337
 338         for (i = 0; i < sh; i++)
 339                 {
 340                 sp = s_pix + (i * srs);
 341                 for (j = 0; j < sw; j++)
 342                         {
 343                         if (counter_clockwise)
 344                                 {
 345                                 dp = d_pix + ((dh - j - 1) * drs) + (i * a);
 346                                 }
 347                         else
 348                                 {
 349                                 dp = d_pix + (j * drs) + ((dw - i - 1) * a);
 350                                 }
 351
 352                         *(dp++) = *(sp++);      /* r */
 353                         *(dp++) = *(sp++);      /* g */
 354                         *(dp++) = *(sp++);      /* b */
 355                         if (has_alpha) *(dp) = *(sp++); /* a */
 356                         }
 357                 }
 358 #endif
 359
 360         return dest;
 361 }
 362
 363 /*
 364  * Returns a copy of pixbuf mirrored and or flipped.
 365  * TO do a 180 degree rotations set both mirror and flipped TRUE
 366  * if mirror and flip are FALSE, result is a simple copy.
 367  */
 368 GdkPixbuf *pixbuf_copy_mirror(GdkPixbuf *src, gint mirror, gint flip)
 369 {
 370         GdkPixbuf *dest;
 371         gint has_alpha;
 372         gint w, h, srs;
 373         gint drs;
 374         guchar *s_pix;
 375         guchar *d_pix;
 376         guchar *sp;
 377         guchar *dp;
 378         gint i, j;
 379         gint a;
 380
 381         if (!src) return NULL;
 382
 383         w = gdk_pixbuf_get_width(src);
 384         h = gdk_pixbuf_get_height(src);
 385         has_alpha = gdk_pixbuf_get_has_alpha(src);
 386         srs = gdk_pixbuf_get_rowstride(src);
 387         s_pix = gdk_pixbuf_get_pixels(src);
 388
 389         dest = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8, w, h);
 390         drs = gdk_pixbuf_get_rowstride(dest);
 391         d_pix = gdk_pixbuf_get_pixels(dest);
 392
 393         a = has_alpha ? 4 : 3;
 394
 395         for (i = 0; i < h; i++)
 396                 {
 397                 sp = s_pix + (i * srs);
 398                 if (flip)
 399                         {
 400                         dp = d_pix + ((h - i - 1) * drs);
 401                         }
 402                 else
 403                         {
 404                         dp = d_pix + (i * drs);
 405                         }
 406                 if (mirror)
 407                         {
 408                         dp += (w - 1) * a;
 409                         for (j = 0; j < w; j++)
 410                                 {
 411                                 *(dp++) = *(sp++);      /* r */
 412                                 *(dp++) = *(sp++);      /* g */
 413                                 *(dp++) = *(sp++);      /* b */
 414                                 if (has_alpha) *(dp) = *(sp++); /* a */
 415                                 dp -= (a + 3);
 416                                 }
 417                         }
 418                 else
 419                         {
 420                         for (j = 0; j < w; j++)
 421                                 {
 422                                 *(dp++) = *(sp++);      /* r */
 423                                 *(dp++) = *(sp++);      /* g */
 424                                 *(dp++) = *(sp++);      /* b */
 425                                 if (has_alpha) *(dp++) = *(sp++);       /* a */
 426                                 }
 427                         }
 428                 }
 429
 430         return dest;
 431 }
 432
 433 GdkPixbuf *pixbuf_apply_orientation(GdkPixbuf *pixbuf, gint orientation)
 434 {
 435         GdkPixbuf *dest;
 436         GdkPixbuf *tmp = NULL;
 437
 438         switch (orientation)
 439                 {
 440                 case EXIF_ORIENTATION_TOP_LEFT:
 441                         dest = gdk_pixbuf_copy(pixbuf);
 442                         break;
 443                 case EXIF_ORIENTATION_TOP_RIGHT:
 444                         /* mirrored */
 445                         dest = pixbuf_copy_mirror(pixbuf, TRUE, FALSE);
 446                         break;
 447                 case EXIF_ORIENTATION_BOTTOM_RIGHT:
 448                         /* upside down */
 449                         dest = pixbuf_copy_mirror(pixbuf, TRUE, TRUE);
 450                         break;
 451                 case EXIF_ORIENTATION_BOTTOM_LEFT:
 452                         /* flipped */
 453                         dest = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 454                         break;
 455                 case EXIF_ORIENTATION_LEFT_TOP:
 456                         tmp = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 457                         dest = pixbuf_copy_rotate_90(tmp, FALSE);
 458                         break;
 459                 case EXIF_ORIENTATION_RIGHT_TOP:
 460                         /* rotated -90 (270) */
 461                         dest = pixbuf_copy_rotate_90(pixbuf, FALSE);
 462                         break;
 463                 case EXIF_ORIENTATION_RIGHT_BOTTOM:
 464                         tmp = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 465                         dest = pixbuf_copy_rotate_90(tmp, TRUE);
 466                         break;
 467                 case EXIF_ORIENTATION_LEFT_BOTTOM:
 468                         /* rotated 90 */
 469                         dest = pixbuf_copy_rotate_90(pixbuf, TRUE);
 470                         break;
 471                 default:
 472                         dest = gdk_pixbuf_copy(pixbuf);
 473                         break;
 474                 }
 475         if (tmp) gdk_pixbuf_unref(tmp);
 476         return dest;
 477
 478 }
 479
 480
 481 /*
 482  *-----------------------------------------------------------------------------
 483  * pixbuf drawing (rectangles)
 484  *-----------------------------------------------------------------------------
 485  */
 486
 487 /*
 488  * Fills region of pixbuf at x,y over w,h
 489  * with colors red (r), green (g), blue (b)
 490  * applying alpha (a), use a=255 for solid.
 491  */
 492 void pixbuf_draw_rect_fill(GdkPixbuf *pb,
 493                            gint x, gint y, gint w, gint h,
 494                            gint r, gint g, gint b, gint a)
 495 {
 496         gint p_alpha;
 497         gint pw, ph, prs;
 498         guchar *p_pix;
 499         guchar *pp;
 500         gint i, j;
 501
 502         if (!pb) return;
 503
 504         pw = gdk_pixbuf_get_width(pb);
 505         ph = gdk_pixbuf_get_height(pb);
 506
 507         if (x < 0 || x + w > pw) return;
 508         if (y < 0 || y + h > ph) return;
 509
 510         p_alpha = gdk_pixbuf_get_has_alpha(pb);
 511         prs = gdk_pixbuf_get_rowstride(pb);
 512         p_pix = gdk_pixbuf_get_pixels(pb);
 513
 514         for (i = 0; i < h; i++)
 515                 {
 516                 pp = p_pix + (y + i) * prs + (x * (p_alpha ? 4 : 3));
 517                 for (j = 0; j < w; j++)
 518                         {
 519                         *pp = (r * a + *pp * (256-a)) >> 8;
 520                         pp++;
 521                         *pp = (g * a + *pp * (256-a)) >> 8;
 522                         pp++;
 523                         *pp = (b * a + *pp * (256-a)) >> 8;
 524                         pp++;
 525                         if (p_alpha) pp++;
 526                         }
 527                 }
 528 }
 529
 530 void pixbuf_draw_rect(GdkPixbuf *pb,
 531                       gint x, gint y, gint w, gint h,
 532                       gint r, gint g, gint b, gint a,
 533                       gint left, gint right, gint top, gint bottom)
 534 {
 535         pixbuf_draw_rect_fill(pb, x + left, y, w - left - right, top,
 536                               r, g, b ,a);
 537         pixbuf_draw_rect_fill(pb, x + w - right, y, right, h,
 538                               r, g, b ,a);
 539         pixbuf_draw_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
 540                               r, g, b ,a);
 541         pixbuf_draw_rect_fill(pb, x, y, left, h,
 542                               r, g, b ,a);
 543 }
 544
 545 void pixbuf_set_rect_fill(GdkPixbuf *pb,
 546                           gint x, gint y, gint w, gint h,
 547                           gint r, gint g, gint b, gint a)
 548 {
 549         gint p_alpha;
 550         gint pw, ph, prs;
 551         guchar *p_pix;
 552         guchar *pp;
 553         gint i, j;
 554
 555         if (!pb) return;
 556
 557         pw = gdk_pixbuf_get_width(pb);
 558         ph = gdk_pixbuf_get_height(pb);
 559
 560         if (x < 0 || x + w > pw) return;
 561         if (y < 0 || y + h > ph) return;
 562
 563         p_alpha = gdk_pixbuf_get_has_alpha(pb);
 564         prs = gdk_pixbuf_get_rowstride(pb);
 565         p_pix = gdk_pixbuf_get_pixels(pb);
 566
 567         for (i = 0; i < h; i++)
 568                 {
 569                 pp = p_pix + (y + i) * prs + (x * (p_alpha ? 4 : 3));
 570                 for (j = 0; j < w; j++)
 571                         {
 572                         *pp = r; pp++;
 573                         *pp = g; pp++;
 574                         *pp = b; pp++;
 575                         if (p_alpha) { *pp = a; pp++; }
 576                         }
 577                 }
 578 }
 579
 580 void pixbuf_set_rect(GdkPixbuf *pb,
 581                      gint x, gint y, gint w, gint h,
 582                      gint r, gint g, gint b, gint a,
 583                      gint left, gint right, gint top, gint bottom)
 584 {
 585         pixbuf_set_rect_fill(pb, x + left, y, w - left - right, top,
 586                              r, g, b ,a);
 587         pixbuf_set_rect_fill(pb, x + w - right, y, right, h,
 588                              r, g, b ,a);
 589         pixbuf_set_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
 590                              r, g, b ,a);
 591         pixbuf_set_rect_fill(pb, x, y, left, h,
 592                              r, g, b ,a);
 593 }
 594
 595 void pixbuf_pixel_set(GdkPixbuf *pb, gint x, gint y, gint r, gint g, gint b, gint a)
 596 {
 597         guchar *buf;
 598         gint has_alpha;
 599         gint rowstride;
 600         guchar *p;
 601
 602         if (x < 0 || x >= gdk_pixbuf_get_width(pb) ||
 603             y < 0 || y >= gdk_pixbuf_get_height(pb)) return;
 604
 605         buf = gdk_pixbuf_get_pixels(pb);
 606         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 607         rowstride = gdk_pixbuf_get_rowstride(pb);
 608
 609         p = buf + (y * rowstride) + (x * (has_alpha ? 4 : 3));
 610         *p = r; p++;
 611         *p = g; p++;
 612         *p = b; p++;
 613         if (has_alpha) *p = a;
 614 }
 615
 616
 617 /*
 618  *-----------------------------------------------------------------------------
 619  * pixbuf text rendering
 620  *-----------------------------------------------------------------------------
 621  */
 622
 623 static void pixbuf_copy_font(GdkPixbuf *src, gint sx, gint sy,
 624                              GdkPixbuf *dest, gint dx, gint dy,
 625                              gint w, gint h,
 626                              guint8 r, guint8 g, guint8 b, guint8 a)
 627 {
 628         gint sw, sh, srs;
 629         gint s_alpha;
 630         gint s_step;
 631         guchar *s_pix;
 632         gint dw, dh, drs;
 633         gint d_alpha;
 634         gint d_step;
 635         guchar *d_pix;
 636
 637         guchar *sp;
 638         guchar *dp;
 639         gint i, j;
 640
 641         if (!src || !dest) return;
 642
 643         sw = gdk_pixbuf_get_width(src);
 644         sh = gdk_pixbuf_get_height(src);
 645
 646         if (sx < 0 || sx + w > sw) return;
 647         if (sy < 0 || sy + h > sh) return;
 648
 649         dw = gdk_pixbuf_get_width(dest);
 650         dh = gdk_pixbuf_get_height(dest);
 651
 652         if (dx < 0 || dx + w > dw) return;
 653         if (dy < 0 || dy + h > dh) return;
 654
 655         s_alpha = gdk_pixbuf_get_has_alpha(src);
 656         d_alpha = gdk_pixbuf_get_has_alpha(dest);
 657         srs = gdk_pixbuf_get_rowstride(src);
 658         drs = gdk_pixbuf_get_rowstride(dest);
 659         s_pix = gdk_pixbuf_get_pixels(src);
 660         d_pix = gdk_pixbuf_get_pixels(dest);
 661
 662         s_step = (s_alpha) ? 4 : 3;
 663         d_step = (d_alpha) ? 4 : 3;
 664
 665         for (i = 0; i < h; i++)
 666                 {
 667                 sp = s_pix + (sy + i) * srs + sx * s_step;
 668                 dp = d_pix + (dy + i) * drs + dx * d_step;
 669                 for (j = 0; j < w; j++)
 670                         {
 671                         if (*sp)
 672                                 {
 673                                 guint8 asub;
 674
 675                                 asub = a * sp[0] / 255;
 676                                 *dp = (r * asub + *dp * (256-asub)) >> 8;
 677                                 dp++;
 678                                 asub = a * sp[1] / 255;
 679                                 *dp = (g * asub + *dp * (256-asub)) >> 8;
 680                                 dp++;
 681                                 asub = a * sp[2] / 255;
 682                                 *dp = (b * asub + *dp * (256-asub)) >> 8;
 683                                 dp++;
 684
 685                                 if (d_alpha)
 686                                         {
 687                                         *dp = MAX(*dp, a * ((sp[0] + sp[1] + sp[2]) / 3) / 255);
 688                                         dp++;
 689                                         }
 690                                 }
 691                         else
 692                                 {
 693                                 dp += d_step;
 694                                 }
 695
 696                         sp += s_step;
 697                         }
 698                 }
 699 }
 700
 701 void pixbuf_draw_layout(GdkPixbuf *pixbuf, PangoLayout *layout, GtkWidget *widget,
 702                         gint x, gint y,
 703                         guint8 r, guint8 g, guint8 b, guint8 a)
 704 {
 705         GdkPixmap *pixmap;
 706         GdkPixbuf *buffer;
 707         gint w, h;
 708         GdkGC *gc;
 709         gint sx, sy;
 710         gint dw, dh;
 711
 712         if (!widget || !widget->window) return;
 713
 714         pango_layout_get_pixel_size(layout, &w, &h);
 715         if (w < 1 || h < 1) return;
 716
 717         pixmap = gdk_pixmap_new(widget->window, w, h, -1);
 718
 719         gc = gdk_gc_new(widget->window);
 720         gdk_gc_copy(gc, widget->style->black_gc);
 721         gdk_draw_rectangle(pixmap, gc, TRUE, 0, 0, w, h);
 722         gdk_gc_copy(gc, widget->style->white_gc);
 723         gdk_draw_layout(pixmap, gc, 0, 0, layout);
 724         g_object_unref(gc);
 725
 726         buffer = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, w, h);
 727         gdk_pixbuf_get_from_drawable(buffer, pixmap,
 728                                      gdk_drawable_get_colormap(widget->window),
 729                                      0, 0, 0, 0, w, h);
 730         g_object_unref(pixmap);
 731
 732         sx = 0;
 733         sy = 0;
 734         dw = gdk_pixbuf_get_width(pixbuf);
 735         dh = gdk_pixbuf_get_height(pixbuf);
 736
 737         if (x < 0)
 738                 {
 739                 w += x;
 740                 sx = -x;
 741                 x = 0;
 742                 }
 743
 744         if (y < 0)
 745                 {
 746                 h += y;
 747                 sy = -y;
 748                 y = 0;
 749                 }
 750
 751         if (x + w > dw) w = dw - x;
 752         if (y + h > dh) h = dh - y;
 753
 754         pixbuf_copy_font(buffer, sx, sy,
 755                          pixbuf, x, y, w, h,
 756                          r, g, b, a);
 757
 758         g_object_unref(buffer);
 759 }
 760
 761 /*
 762  *-----------------------------------------------------------------------------
 763  * pixbuf drawing (triangle)
 764  *-----------------------------------------------------------------------------
 765  */
 766
 767 void util_clip_triangle(gint x1, gint y1, gint x2, gint y2, gint x3, gint y3,
 768                         gint *rx, gint *ry, gint *rw, gint *rh)
 769 {
 770         gint tx, ty, tw, th;
 771
 772         tx = MIN(x1, x2);
 773         tx = MIN(tx, x3);
 774         ty = MIN(y1, y2);
 775         ty = MIN(ty, y3);
 776         tw = MAX(abs(x1 - x2), abs(x2 - x3));
 777         tw = MAX(tw, abs(x3 - x1));
 778         th = MAX(abs(y1 - y2), abs(y2 - y3));
 779         th = MAX(th, abs(y3 - y1));
 780
 781         *rx = tx;
 782         *ry = ty;
 783         *rw = tw;
 784         *rh = th;
 785 }
 786
 787 void pixbuf_draw_triangle(GdkPixbuf *pb,
 788                           gint clip_x, gint clip_y, gint clip_w, gint clip_h,
 789                           gint x1, gint y1, gint x2, gint y2, gint x3, gint y3,
 790                           guint8 r, guint8 g, guint8 b, guint8 a)
 791 {
 792         gint p_alpha;
 793         gint pw, ph, prs;
 794         gint rx, ry, rw, rh;
 795         gint tx, ty, tw, th;
 796         gint fx1, fy1;
 797         gint fx2, fy2;
 798         gint fw, fh;
 799         guchar *p_pix;
 800         guchar *pp;
 801         gint p_step;
 802         gdouble slope1, slope2;
 803         gint slope1_x, slope1_y;
 804         gint y;
 805         gint t;
 806         gint middle = FALSE;
 807
 808         if (!pb) return;
 809
 810         pw = gdk_pixbuf_get_width(pb);
 811         ph = gdk_pixbuf_get_height(pb);
 812
 813         if (!util_clip_region(0, 0, pw, ph,
 814                               clip_x, clip_y, clip_w, clip_h,
 815                               &rx, &ry, &rw, &rh)) return;
 816
 817         util_clip_triangle(x1, y1, x2, y2, x3, y3,
 818                            &tx, &ty, &tw, &th);
 819
 820         if (!util_clip_region(rx, ry, rw, rh,
 821                               tx, ty, tw, th,
 822                               &fx1, &fy1, &fw, &fh)) return;
 823         fx2 = fx1 + fw;
 824         fy2 = fy1 + fh;
 825
 826         p_alpha = gdk_pixbuf_get_has_alpha(pb);
 827         prs = gdk_pixbuf_get_rowstride(pb);
 828         p_pix = gdk_pixbuf_get_pixels(pb);
 829
 830         p_step = (p_alpha) ? 4 : 3;
 831
 832         if (y1 > y2)
 833                 {
 834                 t = x1; x1 = x2; x2 = t;
 835                 t = y1; y1 = y2; y2 = t;
 836                 }
 837         if (y2 > y3)
 838                 {
 839                 t = x2; x2 = x3; x3 = t;
 840                 t = y2; y2 = y3; y3 = t;
 841                 }
 842         if (y1 > y2)
 843                 {
 844                 t = x1; x1 = x2; x2 = t;
 845                 t = y1; y1 = y2; y2 = t;
 846                 }
 847
 848         slope1 = (gdouble)(y2 - y1);
 849         if (slope1) slope1 = (gdouble)(x2 - x1) / slope1;
 850         slope1_x = x1;
 851         slope1_y = y1;
 852         slope2 = (gdouble)(y3 - y1);
 853         if (slope2) slope2 = (gdouble)(x3 - x1) / slope2;
 854
 855         for (y = fy1; y < fy2; y++)
 856                 {
 857                 gint xa, xb;
 858
 859                 if (!middle && y > y2)
 860                         {
 861                         slope1 = (gdouble)(y3 - y2);
 862                         if (slope1) slope1 = (gdouble)(x3 - x2) / slope1;
 863                         slope1_x = x2;
 864                         slope1_y = y2;
 865
 866                         middle = TRUE;
 867                         }
 868
 869                 xa = slope1_x + ((gdouble)slope1 * (y - slope1_y) + 0.5);
 870                 xb = x1 + ((gdouble)slope2 * (y - y1) + 0.5);
 871
 872                 if (xa > xb)
 873                         {
 874                         t = xa; xa = xb; xb = t;
 875                         }
 876
 877                 xa = CLAMP(xa, fx1, fx2);
 878                 xb = CLAMP(xb, fx1, fx2);
 879
 880                 pp = p_pix + y * prs + xa * p_step;
 881
 882                 while (xa < xb)
 883                         {
 884                         *pp = (r * a + *pp * (256-a)) >> 8;
 885                         pp++;
 886                         *pp = (g * a + *pp * (256-a)) >> 8;
 887                         pp++;
 888                         *pp = (b * a + *pp * (256-a)) >> 8;
 889                         pp++;
 890                         if (p_alpha) pp++;
 891
 892                         xa++;
 893                         }
 894                 }
 895 }
 896
 897 /*
 898  *-----------------------------------------------------------------------------
 899  * pixbuf drawing (line)
 900  *-----------------------------------------------------------------------------
 901  */
 902
 903 static gint util_clip_line(gdouble clip_x, gdouble clip_y, gdouble clip_w, gdouble clip_h,
 904                            gdouble x1, gdouble y1, gdouble x2, gdouble y2,
 905                            gdouble *rx1, gdouble *ry1, gdouble *rx2, gdouble *ry2)
 906 {
 907         gint flip = FALSE;
 908         gdouble d;
 909
 910         if (x1 > x2)
 911                 {
 912                 gdouble t;
 913
 914                 t = x1; x1 = x2; x2 = t;
 915                 t = y1; y1 = y2; y2 = t;
 916                 flip = TRUE;
 917                 }
 918
 919         if (x2 < clip_x || x1 > clip_x + clip_w) return FALSE;
 920
 921         if (y1 < y2)
 922                 {
 923                 if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
 924                 }
 925         else
 926                 {
 927                 if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
 928                 }
 929
 930 #if 0
 931         if (x1 >= clip_x && x2 <= clip_x + clip_w)
 932                 {
 933                 if (y1 < y2)
 934                         {
 935                         if (y1 >= clip_y && y2 <= clip_y + clip_h) return TRUE;
 936                         }
 937                 else
 938                         {
 939                         if (y2 >= clip_y && y1 <= clip_y + clip_h) return TRUE;
 940                         }
 941                 }
 942 #endif
 943
 944         d = x2 - x1;
 945         if (d > 0.0)
 946                 {
 947                 gdouble slope;
 948
 949                 slope = (y2 - y1) / d;
 950                 if (x1 < clip_x)
 951                         {
 952                         y1 = y1 + slope * (clip_x - x1);
 953                         x1 = clip_x;
 954                         }
 955                 if (x2 > clip_x + clip_w)
 956                         {
 957                         y2 = y2 + slope * (clip_x + clip_w - x2);
 958                         x2 = clip_x + clip_w;
 959                         }
 960                 }
 961
 962         if (y1 < y2)
 963                 {
 964                 if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
 965                 }
 966         else
 967                 {
 968                 gdouble t;
 969
 970                 if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
 971
 972                 t = x1; x1 = x2; x2 = t;
 973                 t = y1; y1 = y2; y2 = t;
 974                 flip = !flip;
 975                 }
 976
 977         d = y2 - y1;
 978         if (d > 0.0)
 979                 {
 980                 gdouble slope;
 981
 982                 slope = (x2 - x1) / d;
 983                 if (y1 < clip_y)
 984                         {
 985                         x1 = x1 + slope * (clip_y - y1);
 986                         y1 = clip_y;
 987                         }
 988                 if (y2 > clip_y + clip_h)
 989                         {
 990                         x2 = x2 + slope * (clip_y + clip_h - y2);
 991                         y2 = clip_y + clip_h;
 992                         }
 993                 }
 994
 995         if (flip)
 996                 {
 997                 *rx1 = x2;
 998                 *ry1 = y2;
 999                 *rx2 = x1;
1000                 *ry2 = y1;
1001                 }
1002         else
1003                 {
1004                 *rx1 = x1;
1005                 *ry1 = y1;
1006                 *rx2 = x2;
1007                 *ry2 = y2;
1008                 }
1009
1010         return TRUE;
1011 }
1012
1013 void pixbuf_draw_line(GdkPixbuf *pb,
1014                       gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1015                       gint x1, gint y1, gint x2, gint y2,
1016                       guint8 r, guint8 g, guint8 b, guint8 a)
1017 {
1018         gint p_alpha;
1019         gint pw, ph, prs;
1020         gint rx, ry, rw, rh;
1021         gdouble rx1, ry1, rx2, ry2;
1022         guchar *p_pix;
1023         guchar *pp;
1024         gint p_step;
1025         gdouble slope;
1026         gdouble x, y;
1027         gint px, py;
1028         gint cx1, cy1, cx2, cy2;
1029
1030         if (!pb) return;
1031
1032         pw = gdk_pixbuf_get_width(pb);
1033         ph = gdk_pixbuf_get_height(pb);
1034
1035         if (!util_clip_region(0, 0, pw, ph,
1036                               clip_x, clip_y, clip_w, clip_h,
1037                               &rx, &ry, &rw, &rh)) return;
1038         if (!util_clip_line((gdouble)rx, (gdouble)ry, (gdouble)rw, (gdouble)rh,
1039                             (gdouble)x1, (gdouble)y1, (gdouble)x2, (gdouble)y2,
1040                             &rx1, &ry1, &rx2, &ry2)) return;
1041
1042         cx1 = rx;
1043         cy1 = ry;
1044         cx2 = rx + rw;
1045         cy2 = ry + rh;
1046
1047         p_alpha = gdk_pixbuf_get_has_alpha(pb);
1048         prs = gdk_pixbuf_get_rowstride(pb);
1049         p_pix = gdk_pixbuf_get_pixels(pb);
1050
1051         p_step = (p_alpha) ? 4 : 3;
1052
1053         if (fabs(rx2 - rx1) > fabs(ry2 - ry1))
1054                 {
1055                 if (rx1 > rx2)
1056                         {
1057                         gdouble t;
1058                         t = rx1; rx1 = rx2; rx2 = t;
1059                         t = ry1; ry1 = ry2; ry2 = t;
1060                         }
1061
1062                 slope = rx2 - rx1;
1063                 if (slope != 0.0) slope = (ry2 - ry1) / slope;
1064                 for (x = rx1; x < rx2; x += 1.0)
1065                         {
1066                         px = (gint)(x + 0.5);
1067                         py = (gint)(ry1 + (x - rx1) * slope + 0.5);
1068
1069                         if (px >=  cx1 && px < cx2 && py >= cy1 && py < cy2)
1070                                 {
1071                                 pp = p_pix + py * prs + px * p_step;
1072                                 *pp = (r * a + *pp * (256-a)) >> 8;
1073                                 pp++;
1074                                 *pp = (g * a + *pp * (256-a)) >> 8;
1075                                 pp++;
1076                                 *pp = (b * a + *pp * (256-a)) >> 8;
1077                                 }
1078                         }
1079                 }
1080         else
1081                 {
1082                 if (ry1 > ry2)
1083                         {
1084                         gdouble t;
1085                         t = rx1; rx1 = rx2; rx2 = t;
1086                         t = ry1; ry1 = ry2; ry2 = t;
1087                         }
1088
1089                 slope = ry2 - ry1;
1090                 if (slope != 0.0) slope = (rx2 - rx1) / slope;
1091                 for (y = ry1; y < ry2; y += 1.0)
1092                         {
1093                         px = (gint)(rx1 + (y - ry1) * slope + 0.5);
1094                         py = (gint)(y + 0.5);
1095
1096                         if (px >=  cx1 && px < cx2 && py >= cy1 && py < cy2)
1097                                 {
1098                                 pp = p_pix + py * prs + px * p_step;
1099                                 *pp = (r * a + *pp * (256-a)) >> 8;
1100                                 pp++;
1101                                 *pp = (g * a + *pp * (256-a)) >> 8;
1102                                 pp++;
1103                                 *pp = (b * a + *pp * (256-a)) >> 8;
1104                                 }
1105                         }
1106                 }
1107 }
1108
1109 /*
1110  *-----------------------------------------------------------------------------
1111  * pixbuf drawing (fades and shadows)
1112  *-----------------------------------------------------------------------------
1113  */
1114
1115 static void pixbuf_draw_fade_linear(guchar *p_pix, gint prs, gint p_alpha,
1116                                     gint s, gint vertical, gint border,
1117                                     gint x1, gint y1, gint x2, gint y2,
1118                                     guint8 r, guint8 g, guint8 b, guint8 a)
1119 {
1120         guchar *pp;
1121         gint p_step;
1122         guint8 n = a;
1123         gint i, j;
1124
1125         p_step = (p_alpha) ? 4 : 3;
1126         for (j = y1; j < y2; j++)
1127                 {
1128                 pp = p_pix + j * prs + x1 * p_step;
1129                 if (!vertical) n = a - a * abs(j - s) / border;
1130                 for (i = x1; i < x2; i++)
1131                         {
1132                         if (vertical) n = a - a * abs(i - s) / border;
1133                         *pp = (r * n + *pp * (256-n)) >> 8;
1134                         pp++;
1135                         *pp = (g * n + *pp * (256-n)) >> 8;
1136                         pp++;
1137                         *pp = (b * n + *pp * (256-n)) >> 8;
1138                         pp++;
1139                         if (p_alpha) pp++;
1140                         }
1141                 }
1142 }
1143
1144 static void pixbuf_draw_fade_radius(guchar *p_pix, gint prs, gint p_alpha,
1145                                     gint sx, gint sy, gint border,
1146                                     gint x1, gint y1, gint x2, gint y2,
1147                                     guint8 r, guint8 g, guint8 b, guint8 a)
1148 {
1149         guchar *pp;
1150         gint p_step;
1151         gint i, j;
1152
1153         p_step = (p_alpha) ? 4 : 3;
1154         for (j = y1; j < y2; j++)
1155                 {
1156                 pp = p_pix + j * prs + x1 * p_step;
1157                 for (i = x1; i < x2; i++)
1158                         {
1159                         guint8 n;
1160                         gint r;
1161
1162                         r = MIN(border, (gint)sqrt((i-sx)*(i-sx) + (j-sy)*(j-sy)));
1163                         n = a - a * r / border;
1164                         *pp = (r * n + *pp * (256-n)) >> 8;
1165                         pp++;
1166                         *pp = (g * n + *pp * (256-n)) >> 8;
1167                         pp++;
1168                         *pp = (b * n + *pp * (256-n)) >> 8;
1169                         pp++;
1170                         if (p_alpha) pp++;
1171                         }
1172                 }
1173 }
1174
1175 void pixbuf_draw_shadow(GdkPixbuf *pb,
1176                         gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1177                         gint x, gint y, gint w, gint h, gint border,
1178                         guint8 r, guint8 g, guint8 b, guint8 a)
1179 {
1180         gint p_alpha;
1181         gint pw, ph, prs;
1182         gint rx, ry, rw, rh;
1183         gint fx, fy, fw, fh;
1184         guchar *p_pix;
1185
1186         if (!pb) return;
1187
1188         pw = gdk_pixbuf_get_width(pb);
1189         ph = gdk_pixbuf_get_height(pb);
1190
1191         if (!util_clip_region(0, 0, pw, ph,
1192                               clip_x, clip_y, clip_w, clip_h,
1193                               &rx, &ry, &rw, &rh)) return;
1194
1195         p_alpha = gdk_pixbuf_get_has_alpha(pb);
1196         prs = gdk_pixbuf_get_rowstride(pb);
1197         p_pix = gdk_pixbuf_get_pixels(pb);
1198
1199         if (util_clip_region(x + border, y + border, w - border * 2, h - border * 2,
1200                              rx, ry, rw, rh,
1201                              &fx, &fy, &fw, &fh))
1202                 {
1203                 pixbuf_draw_rect_fill(pb, fx, fy, fw, fh, r, g, b, a);
1204                 }
1205
1206         if (border < 1) return;
1207
1208         if (util_clip_region(x, y + border, border, h - border * 2,
1209                              rx, ry, rw, rh,
1210                              &fx, &fy, &fw, &fh))
1211                 {
1212                 pixbuf_draw_fade_linear(p_pix, prs, p_alpha,
1213                                         x + border, TRUE, border,
1214                                         fx, fy, fx + fw, fy + fh,
1215                                         r, g, b, a);
1216                 }
1217         if (util_clip_region(x + w - border, y + border, border, h - border * 2,
1218                              rx, ry, rw, rh,
1219                              &fx, &fy, &fw, &fh))
1220                 {
1221                 pixbuf_draw_fade_linear(p_pix, prs, p_alpha,
1222                                         x + w - border, TRUE, border,
1223                                         fx, fy, fx + fw, fy + fh,
1224                                         r, g, b, a);
1225                 }
1226         if (util_clip_region(x + border, y, w - border * 2, border,
1227                              rx, ry, rw, rh,
1228                              &fx, &fy, &fw, &fh))
1229                 {
1230                 pixbuf_draw_fade_linear(p_pix, prs, p_alpha,
1231                                         y + border, FALSE, border,
1232                                         fx, fy, fx + fw, fy + fh,
1233                                         r, g, b, a);
1234                 }
1235         if (util_clip_region(x + border, y + h - border, w - border * 2, border,
1236                              rx, ry, rw, rh,
1237                              &fx, &fy, &fw, &fh))
1238                 {
1239                 pixbuf_draw_fade_linear(p_pix, prs, p_alpha,
1240                                         y + h - border, FALSE, border,
1241                                         fx, fy, fx + fw, fy + fh,
1242                                         r, g, b, a);
1243                 }
1244         if (util_clip_region(x, y, border, border,
1245                              rx, ry, rw, rh,
1246                              &fx, &fy, &fw, &fh))
1247                 {
1248                 pixbuf_draw_fade_radius(p_pix, prs, p_alpha,
1249                                         x + border, y + border, border,
1250                                         fx, fy, fx + fw, fy + fh,
1251                                         r, g, b, a);
1252                 }
1253         if (util_clip_region(x + w - border, y, border, border,
1254                              rx, ry, rw, rh,
1255                              &fx, &fy, &fw, &fh))
1256                 {
1257                 pixbuf_draw_fade_radius(p_pix, prs, p_alpha,
1258                                         x + w - border, y + border, border,
1259                                         fx, fy, fx + fw, fy + fh,
1260                                         r, g, b, a);
1261                 }
1262         if (util_clip_region(x, y + h - border, border, border,
1263                              rx, ry, rw, rh,
1264                              &fx, &fy, &fw, &fh))
1265                 {
1266                 pixbuf_draw_fade_radius(p_pix, prs, p_alpha,
1267                                         x + border, y + h - border, border,
1268                                         fx, fy, fx + fw, fy + fh,
1269                                         r, g, b, a);
1270                 }
1271         if (util_clip_region(x + w - border, y + h - border, border, border,
1272                              rx, ry, rw, rh,
1273                              &fx, &fy, &fw, &fh))
1274                 {
1275                 pixbuf_draw_fade_radius(p_pix, prs, p_alpha,
1276                                         x + w - border, y + h - border, border,
1277                                         fx, fy, fx + fw, fy + fh,
1278                                         r, g, b, a);
1279                 }
1280 }
1281
1282
1283 /*
1284  *-----------------------------------------------------------------------------
1285  * pixbuf color alterations
1286  *-----------------------------------------------------------------------------
1287  */
1288
1289 void pixbuf_desaturate_rect(GdkPixbuf *pb,
1290                             gint x, gint y, gint w, gint h)
1291 {
1292         gint p_alpha;
1293         gint pw, ph, prs;
1294         guchar *p_pix;
1295         guchar *pp;
1296         gint i, j;
1297
1298         if (!pb) return;
1299
1300         pw = gdk_pixbuf_get_width(pb);
1301         ph = gdk_pixbuf_get_height(pb);
1302
1303         if (x < 0 || x + w > pw) return;
1304         if (y < 0 || y + h > ph) return;
1305
1306         p_alpha = gdk_pixbuf_get_has_alpha(pb);
1307         prs = gdk_pixbuf_get_rowstride(pb);
1308         p_pix = gdk_pixbuf_get_pixels(pb);
1309
1310         for (i = 0; i < h; i++)
1311                 {
1312                 pp = p_pix + (y + i) * prs + (x * (p_alpha ? 4 : 3));
1313                 for (j = 0; j < w; j++)
1314                         {
1315                         guint8 grey;
1316
1317                         grey = (pp[0] + pp[1] + pp[2]) / 3;
1318                         *pp = grey;
1319                         pp++;
1320                         *pp = grey;
1321                         pp++;
1322                         *pp = grey;
1323                         pp++;
1324                         if (p_alpha) pp++;
1325                         }
1326                 }
1327 }