src/pixbuf_util.c

   1 /*
   2  * Copyright (C) 2004 John Ellis
   3  * Copyright (C) 2008 - 2016 The Geeqie Team
   4  *
   5  * Author: John Ellis
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program 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
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include "main.h"
  23 #include "pixbuf_util.h"
  24 #include "exif.h"
  25 #include "ui_fileops.h"
  26
  27 #include "icons/icons_inline.h"
  28
  29 #include <math.h>
  30
  31
  32 /*
  33  *-----------------------------------------------------------------------------
  34  * png save
  35  *-----------------------------------------------------------------------------
  36  */
  37
  38 gboolean pixbuf_to_file_as_png(GdkPixbuf *pixbuf, const gchar *filename)
  39 {
  40         GError *error = NULL;
  41         gboolean ret;
  42
  43         if (!pixbuf || !filename) return FALSE;
  44
  45         ret = gdk_pixbuf_save(pixbuf, filename, "png", &error,
  46                               "tEXt::Software", GQ_APPNAME " " VERSION, NULL);
  47
  48         if (error)
  49                 {
  50                 log_printf("Error saving png file: %s\n", error->message);
  51                 g_error_free(error);
  52                 }
  53
  54         return ret;
  55 }
  56
  57 /*
  58  *-----------------------------------------------------------------------------
  59  * jpeg save
  60  *-----------------------------------------------------------------------------
  61  */
  62
  63 gboolean pixbuf_to_file_as_jpg(GdkPixbuf *pixbuf, const gchar *filename, gint quality)
  64 {
  65         GError *error = NULL;
  66         gchar *qbuf;
  67         gboolean ret;
  68
  69         if (!pixbuf || !filename) return FALSE;
  70
  71         if (quality == -1) quality = 75;
  72         if (quality < 1 || quality > 100)
  73                 {
  74                 log_printf("Jpeg not saved, invalid quality %d\n", quality);
  75                 return FALSE;
  76                 }
  77
  78         qbuf = g_strdup_printf("%d", quality);
  79         ret = gdk_pixbuf_save(pixbuf, filename, "jpeg", &error, "quality", qbuf, NULL);
  80         g_free(qbuf);
  81
  82         if (error)
  83                 {
  84                 log_printf("Error saving jpeg to %s\n%s\n", filename, error->message);
  85                 g_error_free(error);
  86                 }
  87
  88         return ret;
  89 }
  90
  91 /*
  92  *-----------------------------------------------------------------------------
  93  * pixbuf from inline
  94  *-----------------------------------------------------------------------------
  95  */
  96
  97 typedef struct _PixbufInline PixbufInline;
  98 struct _PixbufInline
  99 {
 100         const gchar *key;
 101         const guint8 *data;
 102 };
 103
 104 static PixbufInline inline_pixbuf_data[] = {
 105         { PIXBUF_INLINE_FOLDER_CLOSED,  folder_closed },
 106         { PIXBUF_INLINE_FOLDER_LOCKED,  folder_locked },
 107         { PIXBUF_INLINE_FOLDER_OPEN,    folder_open },
 108         { PIXBUF_INLINE_FOLDER_UP,      folder_up },
 109         { PIXBUF_INLINE_SCROLLER,       icon_scroller },
 110         { PIXBUF_INLINE_BROKEN,         icon_broken },
 111         { PIXBUF_INLINE_METADATA,       icon_metadata },
 112         { PIXBUF_INLINE_UNKNOWN,        icon_unknown },
 113         { PIXBUF_INLINE_VIDEO,          icon_video },
 114         { PIXBUF_INLINE_COLLECTION,     icon_collection },
 115         { PIXBUF_INLINE_ICON,           gqview_icon },
 116         { PIXBUF_INLINE_LOGO,           geeqie_logo },
 117         { PIXBUF_INLINE_ICON_FLOAT,     icon_float },
 118         { PIXBUF_INLINE_ICON_THUMB,     icon_thumb },
 119         { PIXBUF_INLINE_ICON_BOOK,      icon_book },
 120         { PIXBUF_INLINE_ICON_CONFIG,    icon_config },
 121         { PIXBUF_INLINE_ICON_TOOLS,     icon_tools },
 122         { PIXBUF_INLINE_ICON_VIEW,      icon_view },
 123         { PIXBUF_INLINE_ICON_GUIDELINES,        icon_guidelines },
 124         { PIXBUF_INLINE_ICON_PANORAMA,  icon_panorama },
 125         { PIXBUF_INLINE_ICON_MAINTENANCE,       icon_maintenance },
 126         { PIXBUF_INLINE_ICON_ZOOMFILLHOR,       icon_zoomfillhor },
 127         { PIXBUF_INLINE_ICON_ZOOMFILLVERT,      icon_zoomfillvert },
 128         { PIXBUF_INLINE_ICON_HIDETOOLS, icon_hidetools },
 129         { PIXBUF_INLINE_ICON_EXIF,      icon_exif },
 130         { PIXBUF_INLINE_ICON_MARKS,     icon_marks },
 131         { PIXBUF_INLINE_ICON_INFO,      icon_info },
 132         { PIXBUF_INLINE_ICON_SORT,      icon_sort },
 133         { PIXBUF_INLINE_ICON_PDF,       icon_pdf },
 134         { PIXBUF_INLINE_ICON_DRAW_RECTANGLE,    icon_draw_rectangle },
 135         { PIXBUF_INLINE_ICON_MOVE,      icon_move },
 136         { PIXBUF_INLINE_ICON_RENAME,    icon_rename },
 137         { PIXBUF_INLINE_ICON_SELECT_ALL,        icon_select_all },
 138         { PIXBUF_INLINE_ICON_SELECT_NONE,       icon_select_none },
 139         { PIXBUF_INLINE_ICON_SELECT_INVERT,     icon_select_invert },
 140         { PIXBUF_INLINE_ICON_SELECT_RECTANGLE,  icon_select_rectangle },
 141         { PIXBUF_INLINE_ICON_FILE_FILTER,       icon_file_filter },
 142         { PIXBUF_INLINE_ICON_CW,        icon_rotate_clockwise },
 143         { PIXBUF_INLINE_ICON_CCW,       icon_rotate_counter_clockwise },
 144         { PIXBUF_INLINE_ICON_180,       icon_rotate_180 },
 145         { PIXBUF_INLINE_ICON_MIRROR,    icon_mirror },
 146         { PIXBUF_INLINE_ICON_FLIP,      icon_flip },
 147         { PIXBUF_INLINE_ICON_ORIGINAL,  icon_original },
 148         { NULL, NULL }
 149 };
 150
 151 GdkPixbuf *pixbuf_inline(const gchar *key)
 152 {
 153         gint i;
 154
 155         if (!key) return NULL;
 156
 157         i = 0;
 158         while (inline_pixbuf_data[i].key)
 159                 {
 160                 if (strcmp(inline_pixbuf_data[i].key, key) == 0)
 161                         {
 162                         return gdk_pixbuf_new_from_inline(-1, inline_pixbuf_data[i].data, FALSE, NULL);
 163                         }
 164                 i++;
 165                 }
 166
 167         log_printf("warning: inline pixbuf key \"%s\" not found.\n", key);
 168
 169         return NULL;
 170 }
 171
 172 static void register_stock_icon(const gchar *key, GdkPixbuf *pixbuf)
 173 {
 174         static GtkIconFactory *icon_factory = NULL;
 175         GtkIconSet *icon_set;
 176
 177         if (!icon_factory)
 178                 {
 179                 icon_factory = gtk_icon_factory_new();
 180                 gtk_icon_factory_add_default(icon_factory);
 181                 }
 182
 183         icon_set = gtk_icon_set_new_from_pixbuf(pixbuf);
 184         gtk_icon_factory_add(icon_factory, key, icon_set);
 185 }
 186
 187
 188 void pixbuf_inline_register_stock_icons(void)
 189 {
 190         gint i;
 191
 192         i = 0;
 193         while (inline_pixbuf_data[i].key)
 194                 {
 195                 register_stock_icon(inline_pixbuf_data[i].key, pixbuf_inline(inline_pixbuf_data[i].key));
 196                 i++;
 197                 }
 198 }
 199
 200 gboolean register_theme_icon_as_stock(const gchar *key, const gchar *icon)
 201 {
 202         GtkIconTheme *icon_theme;
 203         GdkPixbuf *pixbuf;
 204         GError *error = NULL;
 205
 206         icon_theme = gtk_icon_theme_get_default();
 207
 208         if (gtk_icon_theme_has_icon(icon_theme, key)) return FALSE;
 209
 210         pixbuf = gtk_icon_theme_load_icon(icon_theme,
 211                            icon, /* icon name */
 212                            64, /* size */
 213                            0,  /* flags */
 214                            &error);
 215         if (!pixbuf)
 216                 {
 217                 if (error)
 218                         {
 219                         DEBUG_1("Couldn't load icon %s: %s", icon, error->message);
 220                         g_error_free(error);
 221                         error = NULL;
 222                         }
 223
 224                 if (strchr(icon, '.'))
 225                         {
 226                         /* try again without extension */
 227                         gchar *icon2 = remove_extension_from_path(icon);
 228                         pixbuf = gtk_icon_theme_load_icon(icon_theme,
 229                                            icon2, /* icon name */
 230                                            64, /* size */
 231                                            0,  /* flags */
 232                                            &error);
 233                         if (error)
 234                                 {
 235                                 DEBUG_1("Couldn't load icon %s: %s", icon2, error->message);
 236                                 g_error_free(error);
 237                                 }
 238                         g_free(icon2);
 239                         }
 240                 }
 241
 242         if (!pixbuf) return FALSE;
 243
 244         register_stock_icon(key, pixbuf);
 245         return TRUE;
 246 }
 247
 248 gboolean pixbuf_scale_aspect(gint req_w, gint req_h,
 249                              gint old_w, gint old_h,
 250                              gint *new_w, gint *new_h)
 251 {
 252         if (((gdouble)req_w / old_w) < ((gdouble)req_h / old_h))
 253                 {
 254                 *new_w = req_w;
 255                 *new_h = (gdouble)*new_w / old_w * old_h;
 256                 if (*new_h < 1) *new_h = 1;
 257                 }
 258         else
 259                 {
 260                 *new_h = req_h;
 261                 *new_w = (gdouble)*new_h / old_h * old_w;
 262                 if (*new_w < 1) *new_w = 1;
 263                 }
 264
 265         return (*new_w != old_w || *new_h != old_h);
 266 }
 267
 268 GdkPixbuf *pixbuf_fallback(FileData *fd, gint requested_width, gint requested_height)
 269 {
 270         GdkPixbuf *pixbuf;
 271
 272         switch (fd->format_class)
 273                 {
 274                 case FORMAT_CLASS_UNKNOWN:
 275                         pixbuf = pixbuf_inline(PIXBUF_INLINE_UNKNOWN);
 276                         break;
 277                 case FORMAT_CLASS_META:
 278                         pixbuf = pixbuf_inline(PIXBUF_INLINE_METADATA);
 279                         break;
 280                 case FORMAT_CLASS_VIDEO:
 281                         pixbuf = pixbuf_inline(PIXBUF_INLINE_VIDEO);
 282                         break;
 283                 case FORMAT_CLASS_COLLECTION:
 284                         pixbuf = pixbuf_inline(PIXBUF_INLINE_COLLECTION);
 285                         break;
 286                 case FORMAT_CLASS_PDF:
 287                         pixbuf = pixbuf_inline(PIXBUF_INLINE_ICON_PDF);
 288                         break;
 289                 default:
 290                         pixbuf = pixbuf_inline(PIXBUF_INLINE_BROKEN);
 291                 }
 292
 293         if (requested_width && requested_height)
 294                 {
 295                 gint w = gdk_pixbuf_get_width(pixbuf);
 296                 gint h = gdk_pixbuf_get_height(pixbuf);
 297
 298                 if (w > requested_width || h > requested_height)
 299                         {
 300                         gint nw, nh;
 301
 302                         if (pixbuf_scale_aspect(requested_width, requested_height,
 303                                                           w, h, &nw, &nh))
 304                                 {
 305                                 GdkPixbuf *tmp;
 306
 307                                 tmp = pixbuf;
 308                                 pixbuf = gdk_pixbuf_scale_simple(tmp, nw, nh, GDK_INTERP_TILES);
 309                                 g_object_unref(G_OBJECT(tmp));
 310                                 }
 311                         }
 312                 }
 313         return pixbuf;
 314 }
 315
 316
 317 /*
 318  *-----------------------------------------------------------------------------
 319  * misc utils
 320  *-----------------------------------------------------------------------------
 321  */
 322
 323 gboolean util_clip_region(gint x, gint y, gint w, gint h,
 324                           gint clip_x, gint clip_y, gint clip_w, gint clip_h,
 325                           gint *rx, gint *ry, gint *rw, gint *rh)
 326 {
 327         if (clip_x + clip_w <= x ||
 328             clip_x >= x + w ||
 329             clip_y + clip_h <= y ||
 330             clip_y >= y + h)
 331                 {
 332                 return FALSE;
 333                 }
 334
 335         *rx = MAX(x, clip_x);
 336         *rw = MIN((x + w), (clip_x + clip_w)) - *rx;
 337
 338         *ry = MAX(y, clip_y);
 339         *rh = MIN((y + h), (clip_y + clip_h)) - *ry;
 340
 341         return TRUE;
 342 }
 343
 344 /*
 345  *-----------------------------------------------------------------------------
 346  * pixbuf rotation
 347  *-----------------------------------------------------------------------------
 348  */
 349
 350 static void pixbuf_copy_block_rotate(guchar *src, gint src_row_stride, gint x, gint y,
 351                                      guchar *dest, gint dest_row_stride, gint w, gint h,
 352                                      gint bytes_per_pixel, gboolean counter_clockwise)
 353 {
 354         gint i, j;
 355         guchar *sp;
 356         guchar *dp;
 357
 358         for (i = 0; i < h; i++)
 359                 {
 360                 sp = src + ((i + y) * src_row_stride) + (x * bytes_per_pixel);
 361                 for (j = 0; j < w; j++)
 362                         {
 363                         if (counter_clockwise)
 364                                 {
 365                                 dp = dest + ((w - j - 1) * dest_row_stride) + (i * bytes_per_pixel);
 366                                 }
 367                         else
 368                                 {
 369                                 dp = dest + (j * dest_row_stride) + ((h - i - 1) * bytes_per_pixel);
 370                                 }
 371                         *(dp++) = *(sp++);      /* r */
 372                         *(dp++) = *(sp++);      /* g */
 373                         *(dp++) = *(sp++);      /* b */
 374                         if (bytes_per_pixel == 4) *(dp) = *(sp++);      /* a */
 375                         }
 376                 }
 377
 378 }
 379
 380 static void pixbuf_copy_block(guchar *src, gint src_row_stride, gint w, gint h,
 381                               guchar *dest, gint dest_row_stride, gint x, gint y, gint bytes_per_pixel)
 382 {
 383         gint i;
 384         guchar *sp;
 385         guchar *dp;
 386
 387         for (i = 0; i < h; i++)
 388                 {
 389                 sp = src + (i * src_row_stride);
 390                 dp = dest + ((y + i) * dest_row_stride) + (x * bytes_per_pixel);
 391                 memcpy(dp, sp, w * bytes_per_pixel);
 392                 }
 393 }
 394
 395 #define ROTATE_BUFFER_WIDTH 48
 396 #define ROTATE_BUFFER_HEIGHT 48
 397
 398 /*
 399  * Returns a copy of pixbuf src rotated 90 degrees clockwise or 90 counterclockwise
 400  *
 401  */
 402 GdkPixbuf *pixbuf_copy_rotate_90(GdkPixbuf *src, gboolean counter_clockwise)
 403 {
 404         GdkPixbuf *dest;
 405         gboolean has_alpha;
 406         gint sw, sh, srs;
 407         gint dw, dh, drs;
 408         guchar *s_pix;
 409         guchar *d_pix;
 410         gint i, j;
 411         gint a;
 412         GdkPixbuf *buffer;
 413         guchar *b_pix;
 414         gint brs;
 415         gint w, h;
 416
 417         if (!src) return NULL;
 418
 419         sw = gdk_pixbuf_get_width(src);
 420         sh = gdk_pixbuf_get_height(src);
 421         has_alpha = gdk_pixbuf_get_has_alpha(src);
 422         srs = gdk_pixbuf_get_rowstride(src);
 423         s_pix = gdk_pixbuf_get_pixels(src);
 424
 425         dw = sh;
 426         dh = sw;
 427         dest = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8, dw, dh);
 428         drs = gdk_pixbuf_get_rowstride(dest);
 429         d_pix = gdk_pixbuf_get_pixels(dest);
 430
 431         a = (has_alpha ? 4 : 3);
 432
 433         buffer = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8,
 434                                 ROTATE_BUFFER_WIDTH, ROTATE_BUFFER_HEIGHT);
 435         b_pix = gdk_pixbuf_get_pixels(buffer);
 436         brs = gdk_pixbuf_get_rowstride(buffer);
 437
 438         for (i = 0; i < sh; i+= ROTATE_BUFFER_WIDTH)
 439                 {
 440                 w = MIN(ROTATE_BUFFER_WIDTH, (sh - i));
 441                 for (j = 0; j < sw; j += ROTATE_BUFFER_HEIGHT)
 442                         {
 443                         gint x, y;
 444
 445                         h = MIN(ROTATE_BUFFER_HEIGHT, (sw - j));
 446                         pixbuf_copy_block_rotate(s_pix, srs, j, i,
 447                                                  b_pix, brs, h, w,
 448                                                  a, counter_clockwise);
 449
 450                         if (counter_clockwise)
 451                                 {
 452                                 x = i;
 453                                 y = sw - h - j;
 454                                 }
 455                         else
 456                                 {
 457                                 x = sh - w - i;
 458                                 y = j;
 459                                 }
 460                         pixbuf_copy_block(b_pix, brs, w, h,
 461                                           d_pix, drs, x, y, a);
 462                         }
 463                 }
 464
 465         g_object_unref(buffer);
 466
 467 #if 0
 468         /* this is the simple version of rotation (roughly 2-4x slower) */
 469
 470         for (i = 0; i < sh; i++)
 471                 {
 472                 sp = s_pix + (i * srs);
 473                 for (j = 0; j < sw; j++)
 474                         {
 475                         if (counter_clockwise)
 476                                 {
 477                                 dp = d_pix + ((dh - j - 1) * drs) + (i * a);
 478                                 }
 479                         else
 480                                 {
 481                                 dp = d_pix + (j * drs) + ((dw - i - 1) * a);
 482                                 }
 483
 484                         *(dp++) = *(sp++);      /* r */
 485                         *(dp++) = *(sp++);      /* g */
 486                         *(dp++) = *(sp++);      /* b */
 487                         if (has_alpha) *(dp) = *(sp++); /* a */
 488                         }
 489                 }
 490 #endif
 491
 492         return dest;
 493 }
 494
 495 /*
 496  * Returns a copy of pixbuf mirrored and or flipped.
 497  * TO do a 180 degree rotations set both mirror and flipped TRUE
 498  * if mirror and flip are FALSE, result is a simple copy.
 499  */
 500 GdkPixbuf *pixbuf_copy_mirror(GdkPixbuf *src, gboolean mirror, gboolean flip)
 501 {
 502         GdkPixbuf *dest;
 503         gboolean has_alpha;
 504         gint w, h, srs;
 505         gint drs;
 506         guchar *s_pix;
 507         guchar *d_pix;
 508         guchar *sp;
 509         guchar *dp;
 510         gint i, j;
 511         gint a;
 512
 513         if (!src) return NULL;
 514
 515         w = gdk_pixbuf_get_width(src);
 516         h = gdk_pixbuf_get_height(src);
 517         has_alpha = gdk_pixbuf_get_has_alpha(src);
 518         srs = gdk_pixbuf_get_rowstride(src);
 519         s_pix = gdk_pixbuf_get_pixels(src);
 520
 521         dest = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8, w, h);
 522         drs = gdk_pixbuf_get_rowstride(dest);
 523         d_pix = gdk_pixbuf_get_pixels(dest);
 524
 525         a = has_alpha ? 4 : 3;
 526
 527         for (i = 0; i < h; i++)
 528                 {
 529                 sp = s_pix + (i * srs);
 530                 if (flip)
 531                         {
 532                         dp = d_pix + ((h - i - 1) * drs);
 533                         }
 534                 else
 535                         {
 536                         dp = d_pix + (i * drs);
 537                         }
 538                 if (mirror)
 539                         {
 540                         dp += (w - 1) * a;
 541                         for (j = 0; j < w; j++)
 542                                 {
 543                                 *(dp++) = *(sp++);      /* r */
 544                                 *(dp++) = *(sp++);      /* g */
 545                                 *(dp++) = *(sp++);      /* b */
 546                                 if (has_alpha) *(dp) = *(sp++); /* a */
 547                                 dp -= (a + 3);
 548                                 }
 549                         }
 550                 else
 551                         {
 552                         for (j = 0; j < w; j++)
 553                                 {
 554                                 *(dp++) = *(sp++);      /* r */
 555                                 *(dp++) = *(sp++);      /* g */
 556                                 *(dp++) = *(sp++);      /* b */
 557                                 if (has_alpha) *(dp++) = *(sp++);       /* a */
 558                                 }
 559                         }
 560                 }
 561
 562         return dest;
 563 }
 564
 565 GdkPixbuf *pixbuf_apply_orientation(GdkPixbuf *pixbuf, gint orientation)
 566 {
 567         GdkPixbuf *dest;
 568         GdkPixbuf *tmp = NULL;
 569
 570         switch (orientation)
 571                 {
 572                 case EXIF_ORIENTATION_TOP_LEFT:
 573                         dest = gdk_pixbuf_copy(pixbuf);
 574                         break;
 575                 case EXIF_ORIENTATION_TOP_RIGHT:
 576                         /* mirrored */
 577                         dest = pixbuf_copy_mirror(pixbuf, TRUE, FALSE);
 578                         break;
 579                 case EXIF_ORIENTATION_BOTTOM_RIGHT:
 580                         /* upside down */
 581                         dest = pixbuf_copy_mirror(pixbuf, TRUE, TRUE);
 582                         break;
 583                 case EXIF_ORIENTATION_BOTTOM_LEFT:
 584                         /* flipped */
 585                         dest = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 586                         break;
 587                 case EXIF_ORIENTATION_LEFT_TOP:
 588                         tmp = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 589                         dest = pixbuf_copy_rotate_90(tmp, FALSE);
 590                         break;
 591                 case EXIF_ORIENTATION_RIGHT_TOP:
 592                         /* rotated -90 (270) */
 593                         dest = pixbuf_copy_rotate_90(pixbuf, FALSE);
 594                         break;
 595                 case EXIF_ORIENTATION_RIGHT_BOTTOM:
 596                         tmp = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 597                         dest = pixbuf_copy_rotate_90(tmp, TRUE);
 598                         break;
 599                 case EXIF_ORIENTATION_LEFT_BOTTOM:
 600                         /* rotated 90 */
 601                         dest = pixbuf_copy_rotate_90(pixbuf, TRUE);
 602                         break;
 603                 default:
 604                         dest = gdk_pixbuf_copy(pixbuf);
 605                         break;
 606                 }
 607         if (tmp) g_object_unref(tmp);
 608         return dest;
 609
 610 }
 611
 612
 613 /*
 614  *-----------------------------------------------------------------------------
 615  * pixbuf drawing (rectangles)
 616  *-----------------------------------------------------------------------------
 617  */
 618
 619 /*
 620  * Fills region of pixbuf at x,y over w,h
 621  * with colors red (r), green (g), blue (b)
 622  * applying alpha (a), use a=255 for solid.
 623  */
 624 void pixbuf_draw_rect_fill(GdkPixbuf *pb,
 625                            gint x, gint y, gint w, gint h,
 626                            gint r, gint g, gint b, gint a)
 627 {
 628         gboolean has_alpha;
 629         gint pw, ph, prs;
 630         guchar *p_pix;
 631         guchar *pp;
 632         gint i, j;
 633
 634         if (!pb) return;
 635
 636         pw = gdk_pixbuf_get_width(pb);
 637         ph = gdk_pixbuf_get_height(pb);
 638
 639         if (x < 0 || x + w > pw) return;
 640         if (y < 0 || y + h > ph) return;
 641
 642         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 643         prs = gdk_pixbuf_get_rowstride(pb);
 644         p_pix = gdk_pixbuf_get_pixels(pb);
 645
 646         for (i = 0; i < h; i++)
 647                 {
 648                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
 649                 for (j = 0; j < w; j++)
 650                         {
 651                         *pp = (r * a + *pp * (256-a)) >> 8;
 652                         pp++;
 653                         *pp = (g * a + *pp * (256-a)) >> 8;
 654                         pp++;
 655                         *pp = (b * a + *pp * (256-a)) >> 8;
 656                         pp++;
 657                         if (has_alpha) pp++;
 658                         }
 659                 }
 660 }
 661
 662 void pixbuf_draw_rect(GdkPixbuf *pb,
 663                       gint x, gint y, gint w, gint h,
 664                       gint r, gint g, gint b, gint a,
 665                       gint left, gint right, gint top, gint bottom)
 666 {
 667         pixbuf_draw_rect_fill(pb, x + left, y, w - left - right, top,
 668                               r, g, b ,a);
 669         pixbuf_draw_rect_fill(pb, x + w - right, y, right, h,
 670                               r, g, b ,a);
 671         pixbuf_draw_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
 672                               r, g, b ,a);
 673         pixbuf_draw_rect_fill(pb, x, y, left, h,
 674                               r, g, b ,a);
 675 }
 676
 677 void pixbuf_set_rect_fill(GdkPixbuf *pb,
 678                           gint x, gint y, gint w, gint h,
 679                           gint r, gint g, gint b, gint a)
 680 {
 681         gboolean has_alpha;
 682         gint pw, ph, prs;
 683         guchar *p_pix;
 684         guchar *pp;
 685         gint i, j;
 686
 687         if (!pb) return;
 688
 689         pw = gdk_pixbuf_get_width(pb);
 690         ph = gdk_pixbuf_get_height(pb);
 691
 692         if (x < 0 || x + w > pw) return;
 693         if (y < 0 || y + h > ph) return;
 694
 695         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 696         prs = gdk_pixbuf_get_rowstride(pb);
 697         p_pix = gdk_pixbuf_get_pixels(pb);
 698
 699         for (i = 0; i < h; i++)
 700                 {
 701                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
 702                 for (j = 0; j < w; j++)
 703                         {
 704                         *pp = r; pp++;
 705                         *pp = g; pp++;
 706                         *pp = b; pp++;
 707                         if (has_alpha) { *pp = a; pp++; }
 708                         }
 709                 }
 710 }
 711
 712 void pixbuf_set_rect(GdkPixbuf *pb,
 713                      gint x, gint y, gint w, gint h,
 714                      gint r, gint g, gint b, gint a,
 715                      gint left, gint right, gint top, gint bottom)
 716 {
 717         pixbuf_set_rect_fill(pb, x + left, y, w - left - right, top,
 718                              r, g, b ,a);
 719         pixbuf_set_rect_fill(pb, x + w - right, y, right, h,
 720                              r, g, b ,a);
 721         pixbuf_set_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
 722                              r, g, b ,a);
 723         pixbuf_set_rect_fill(pb, x, y, left, h,
 724                              r, g, b ,a);
 725 }
 726
 727 void pixbuf_pixel_set(GdkPixbuf *pb, gint x, gint y, gint r, gint g, gint b, gint a)
 728 {
 729         guchar *buf;
 730         gboolean has_alpha;
 731         gint rowstride;
 732         guchar *p;
 733
 734         if (x < 0 || x >= gdk_pixbuf_get_width(pb) ||
 735             y < 0 || y >= gdk_pixbuf_get_height(pb)) return;
 736
 737         buf = gdk_pixbuf_get_pixels(pb);
 738         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 739         rowstride = gdk_pixbuf_get_rowstride(pb);
 740
 741         p = buf + (y * rowstride) + (x * (has_alpha ? 4 : 3));
 742         *p = r; p++;
 743         *p = g; p++;
 744         *p = b; p++;
 745         if (has_alpha) *p = a;
 746 }
 747
 748
 749 /*
 750  *-----------------------------------------------------------------------------
 751  * pixbuf text rendering
 752  *-----------------------------------------------------------------------------
 753  */
 754
 755 static void pixbuf_copy_font(GdkPixbuf *src, gint sx, gint sy,
 756                              GdkPixbuf *dest, gint dx, gint dy,
 757                              gint w, gint h,
 758                              guint8 r, guint8 g, guint8 b, guint8 a)
 759 {
 760         gint sw, sh, srs;
 761         gboolean s_alpha;
 762         gint s_step;
 763         guchar *s_pix;
 764         gint dw, dh, drs;
 765         gboolean d_alpha;
 766         gint d_step;
 767         guchar *d_pix;
 768
 769         guchar *sp;
 770         guchar *dp;
 771         gint i, j;
 772
 773         if (!src || !dest) return;
 774
 775         sw = gdk_pixbuf_get_width(src);
 776         sh = gdk_pixbuf_get_height(src);
 777
 778         if (sx < 0 || sx + w > sw) return;
 779         if (sy < 0 || sy + h > sh) return;
 780
 781         dw = gdk_pixbuf_get_width(dest);
 782         dh = gdk_pixbuf_get_height(dest);
 783
 784         if (dx < 0 || dx + w > dw) return;
 785         if (dy < 0 || dy + h > dh) return;
 786
 787         s_alpha = gdk_pixbuf_get_has_alpha(src);
 788         d_alpha = gdk_pixbuf_get_has_alpha(dest);
 789         srs = gdk_pixbuf_get_rowstride(src);
 790         drs = gdk_pixbuf_get_rowstride(dest);
 791         s_pix = gdk_pixbuf_get_pixels(src);
 792         d_pix = gdk_pixbuf_get_pixels(dest);
 793
 794         s_step = (s_alpha) ? 4 : 3;
 795         d_step = (d_alpha) ? 4 : 3;
 796
 797         for (i = 0; i < h; i++)
 798                 {
 799                 sp = s_pix + (sy + i) * srs + sx * s_step;
 800                 dp = d_pix + (dy + i) * drs + dx * d_step;
 801                 for (j = 0; j < w; j++)
 802                         {
 803                         if (*sp)
 804                                 {
 805                                 guint8 asub;
 806
 807                                 asub = a * sp[0] / 255;
 808                                 *dp = (r * asub + *dp * (256-asub)) >> 8;
 809                                 dp++;
 810                                 asub = a * sp[1] / 255;
 811                                 *dp = (g * asub + *dp * (256-asub)) >> 8;
 812                                 dp++;
 813                                 asub = a * sp[2] / 255;
 814                                 *dp = (b * asub + *dp * (256-asub)) >> 8;
 815                                 dp++;
 816
 817                                 if (d_alpha)
 818                                         {
 819                                         *dp = MAX(*dp, a * ((sp[0] + sp[1] + sp[2]) / 3) / 255);
 820                                         dp++;
 821                                         }
 822                                 }
 823                         else
 824                                 {
 825                                 dp += d_step;
 826                                 }
 827
 828                         sp += s_step;
 829                         }
 830                 }
 831 }
 832
 833 void pixbuf_draw_layout(GdkPixbuf *pixbuf, PangoLayout *layout, GtkWidget *widget,
 834                         gint x, gint y,
 835                         guint8 r, guint8 g, guint8 b, guint8 a)
 836 {
 837         GdkPixbuf *buffer;
 838         gint w, h;
 839         gint sx, sy;
 840         gint dw, dh;
 841         cairo_surface_t *source;
 842         cairo_t *cr;
 843
 844         pango_layout_get_pixel_size(layout, &w, &h);
 845         if (w < 1 || h < 1) return;
 846
 847         source = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
 848
 849         cr = cairo_create (source);
 850         cairo_set_source_rgb(cr, 0, 0, 0);
 851         cairo_rectangle (cr, 0, 0, w, h);
 852         cairo_fill (cr);
 853         cairo_set_source_rgb(cr, 1, 1, 1);
 854         pango_cairo_show_layout (cr, layout);
 855         cairo_destroy (cr);
 856
 857         buffer = gdk_pixbuf_new_from_data (cairo_image_surface_get_data (source),
 858                                            GDK_COLORSPACE_RGB,
 859                                            cairo_image_surface_get_format (source) == CAIRO_FORMAT_ARGB32,
 860                                            8,
 861                                            cairo_image_surface_get_width (source),
 862                                            cairo_image_surface_get_height (source),
 863                                            cairo_image_surface_get_stride (source),
 864                                            NULL,
 865                                            NULL);
 866
 867         sx = 0;
 868         sy = 0;
 869         dw = gdk_pixbuf_get_width(pixbuf);
 870         dh = gdk_pixbuf_get_height(pixbuf);
 871
 872         if (x < 0)
 873                 {
 874                 w += x;
 875                 sx = -x;
 876                 x = 0;
 877                 }
 878
 879         if (y < 0)
 880                 {
 881                 h += y;
 882                 sy = -y;
 883                 y = 0;
 884                 }
 885
 886         if (x + w > dw) w = dw - x;
 887         if (y + h > dh) h = dh - y;
 888
 889         pixbuf_copy_font(buffer, sx, sy,
 890                          pixbuf, x, y, w, h,
 891                          r, g, b, a);
 892
 893         g_object_unref(buffer);
 894         cairo_surface_destroy(source);
 895 }
 896
 897 /*
 898  *-----------------------------------------------------------------------------
 899  * pixbuf drawing (triangle)
 900  *-----------------------------------------------------------------------------
 901  */
 902
 903 void util_clip_triangle(gint x1, gint y1, gint x2, gint y2, gint x3, gint y3,
 904                         gint *rx, gint *ry, gint *rw, gint *rh)
 905 {
 906         gint tx, ty, tw, th;
 907
 908         tx = MIN(x1, x2);
 909         tx = MIN(tx, x3);
 910         ty = MIN(y1, y2);
 911         ty = MIN(ty, y3);
 912         tw = MAX(abs(x1 - x2), abs(x2 - x3));
 913         tw = MAX(tw, abs(x3 - x1));
 914         th = MAX(abs(y1 - y2), abs(y2 - y3));
 915         th = MAX(th, abs(y3 - y1));
 916
 917         *rx = tx;
 918         *ry = ty;
 919         *rw = tw;
 920         *rh = th;
 921 }
 922
 923 void pixbuf_draw_triangle(GdkPixbuf *pb,
 924                           gint clip_x, gint clip_y, gint clip_w, gint clip_h,
 925                           gint x1, gint y1, gint x2, gint y2, gint x3, gint y3,
 926                           guint8 r, guint8 g, guint8 b, guint8 a)
 927 {
 928         gboolean has_alpha;
 929         gint pw, ph, prs;
 930         gint rx, ry, rw, rh;
 931         gint tx, ty, tw, th;
 932         gint fx1, fy1;
 933         gint fx2, fy2;
 934         gint fw, fh;
 935         guchar *p_pix;
 936         guchar *pp;
 937         gint p_step;
 938         gdouble slope1, slope2;
 939         gint slope1_x, slope1_y;
 940         gint y;
 941         gint t;
 942         gboolean middle = FALSE;
 943
 944         if (!pb) return;
 945
 946         pw = gdk_pixbuf_get_width(pb);
 947         ph = gdk_pixbuf_get_height(pb);
 948
 949         if (!util_clip_region(0, 0, pw, ph,
 950                               clip_x, clip_y, clip_w, clip_h,
 951                               &rx, &ry, &rw, &rh)) return;
 952
 953         util_clip_triangle(x1, y1, x2, y2, x3, y3,
 954                            &tx, &ty, &tw, &th);
 955
 956         if (!util_clip_region(rx, ry, rw, rh,
 957                               tx, ty, tw, th,
 958                               &fx1, &fy1, &fw, &fh)) return;
 959         fx2 = fx1 + fw;
 960         fy2 = fy1 + fh;
 961
 962         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 963         prs = gdk_pixbuf_get_rowstride(pb);
 964         p_pix = gdk_pixbuf_get_pixels(pb);
 965
 966         p_step = (has_alpha) ? 4 : 3;
 967
 968         if (y1 > y2)
 969                 {
 970                 t = x1; x1 = x2; x2 = t;
 971                 t = y1; y1 = y2; y2 = t;
 972                 }
 973         if (y2 > y3)
 974                 {
 975                 t = x2; x2 = x3; x3 = t;
 976                 t = y2; y2 = y3; y3 = t;
 977                 }
 978         if (y1 > y2)
 979                 {
 980                 t = x1; x1 = x2; x2 = t;
 981                 t = y1; y1 = y2; y2 = t;
 982                 }
 983
 984         slope1 = (gdouble)(y2 - y1);
 985         if (slope1) slope1 = (gdouble)(x2 - x1) / slope1;
 986         slope1_x = x1;
 987         slope1_y = y1;
 988         slope2 = (gdouble)(y3 - y1);
 989         if (slope2) slope2 = (gdouble)(x3 - x1) / slope2;
 990
 991         for (y = fy1; y < fy2; y++)
 992                 {
 993                 gint xa, xb;
 994
 995                 if (!middle && y > y2)
 996                         {
 997                         slope1 = (gdouble)(y3 - y2);
 998                         if (slope1) slope1 = (gdouble)(x3 - x2) / slope1;
 999                         slope1_x = x2;
1000                         slope1_y = y2;
1001
1002                         middle = TRUE;
1003                         }
1004
1005                 xa = slope1_x + ((gdouble)slope1 * (y - slope1_y) + 0.5);
1006                 xb = x1 + ((gdouble)slope2 * (y - y1) + 0.5);
1007
1008                 if (xa > xb)
1009                         {
1010                         t = xa; xa = xb; xb = t;
1011                         }
1012
1013                 xa = CLAMP(xa, fx1, fx2);
1014                 xb = CLAMP(xb, fx1, fx2);
1015
1016                 pp = p_pix + y * prs + xa * p_step;
1017
1018                 while (xa < xb)
1019                         {
1020                         *pp = (r * a + *pp * (256-a)) >> 8;
1021                         pp++;
1022                         *pp = (g * a + *pp * (256-a)) >> 8;
1023                         pp++;
1024                         *pp = (b * a + *pp * (256-a)) >> 8;
1025                         pp++;
1026                         if (has_alpha) pp++;
1027
1028                         xa++;
1029                         }
1030                 }
1031 }
1032
1033 /*
1034  *-----------------------------------------------------------------------------
1035  * pixbuf drawing (line)
1036  *-----------------------------------------------------------------------------
1037  */
1038
1039 static gboolean util_clip_line(gdouble clip_x, gdouble clip_y, gdouble clip_w, gdouble clip_h,
1040                                gdouble x1, gdouble y1, gdouble x2, gdouble y2,
1041                                gdouble *rx1, gdouble *ry1, gdouble *rx2, gdouble *ry2)
1042 {
1043         gboolean flip = FALSE;
1044         gdouble d;
1045
1046         if (x1 > x2)
1047                 {
1048                 gdouble t;
1049
1050                 t = x1; x1 = x2; x2 = t;
1051                 t = y1; y1 = y2; y2 = t;
1052                 flip = TRUE;
1053                 }
1054
1055         if (x2 < clip_x || x1 > clip_x + clip_w) return FALSE;
1056
1057         if (y1 < y2)
1058                 {
1059                 if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
1060                 }
1061         else
1062                 {
1063                 if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
1064                 }
1065
1066         d = x2 - x1;
1067         if (d > 0.0)
1068                 {
1069                 gdouble slope;
1070
1071                 slope = (y2 - y1) / d;
1072                 if (x1 < clip_x)
1073                         {
1074                         y1 = y1 + slope * (clip_x - x1);
1075                         x1 = clip_x;
1076                         }
1077                 if (x2 > clip_x + clip_w)
1078                         {
1079                         y2 = y2 + slope * (clip_x + clip_w - x2);
1080                         x2 = clip_x + clip_w;
1081                         }
1082                 }
1083
1084         if (y1 < y2)
1085                 {
1086                 if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
1087                 }
1088         else
1089                 {
1090                 gdouble t;
1091
1092                 if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
1093
1094                 t = x1; x1 = x2; x2 = t;
1095                 t = y1; y1 = y2; y2 = t;
1096                 flip = !flip;
1097                 }
1098
1099         d = y2 - y1;
1100         if (d > 0.0)
1101                 {
1102                 gdouble slope;
1103
1104                 slope = (x2 - x1) / d;
1105                 if (y1 < clip_y)
1106                         {
1107                         x1 = x1 + slope * (clip_y - y1);
1108                         y1 = clip_y;
1109                         }
1110                 if (y2 > clip_y + clip_h)
1111                         {
1112                         x2 = x2 + slope * (clip_y + clip_h - y2);
1113                         y2 = clip_y + clip_h;
1114                         }
1115                 }
1116
1117         if (flip)
1118                 {
1119                 *rx1 = x2;
1120                 *ry1 = y2;
1121                 *rx2 = x1;
1122                 *ry2 = y1;
1123                 }
1124         else
1125                 {
1126                 *rx1 = x1;
1127                 *ry1 = y1;
1128                 *rx2 = x2;
1129                 *ry2 = y2;
1130                 }
1131
1132         return TRUE;
1133 }
1134
1135 void pixbuf_draw_line(GdkPixbuf *pb,
1136                       gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1137                       gint x1, gint y1, gint x2, gint y2,
1138                       guint8 r, guint8 g, guint8 b, guint8 a)
1139 {
1140         gboolean has_alpha;
1141         gint pw, ph, prs;
1142         gint rx, ry, rw, rh;
1143         gdouble rx1, ry1, rx2, ry2;
1144         guchar *p_pix;
1145         guchar *pp;
1146         gint p_step;
1147         gdouble slope;
1148         gdouble x, y;
1149         gint px, py;
1150         gint cx1, cy1, cx2, cy2;
1151
1152         if (!pb) return;
1153
1154         pw = gdk_pixbuf_get_width(pb);
1155         ph = gdk_pixbuf_get_height(pb);
1156
1157         if (!util_clip_region(0, 0, pw, ph,
1158                               clip_x, clip_y, clip_w, clip_h,
1159                               &rx, &ry, &rw, &rh)) return;
1160         if (!util_clip_line((gdouble)rx, (gdouble)ry, (gdouble)rw, (gdouble)rh,
1161                             (gdouble)x1, (gdouble)y1, (gdouble)x2, (gdouble)y2,
1162                             &rx1, &ry1, &rx2, &ry2)) return;
1163
1164         cx1 = rx;
1165         cy1 = ry;
1166         cx2 = rx + rw;
1167         cy2 = ry + rh;
1168
1169         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1170         prs = gdk_pixbuf_get_rowstride(pb);
1171         p_pix = gdk_pixbuf_get_pixels(pb);
1172
1173         p_step = (has_alpha) ? 4 : 3;
1174
1175         if (fabs(rx2 - rx1) > fabs(ry2 - ry1))
1176                 {
1177                 if (rx1 > rx2)
1178                         {
1179                         gdouble t;
1180                         t = rx1; rx1 = rx2; rx2 = t;
1181                         t = ry1; ry1 = ry2; ry2 = t;
1182                         }
1183
1184                 slope = rx2 - rx1;
1185                 if (slope != 0.0) slope = (ry2 - ry1) / slope;
1186                 for (x = rx1; x < rx2; x += 1.0)
1187                         {
1188                         px = (gint)(x + 0.5);
1189                         py = (gint)(ry1 + (x - rx1) * slope + 0.5);
1190
1191                         if (px >=  cx1 && px < cx2 && py >= cy1 && py < cy2)
1192                                 {
1193                                 pp = p_pix + py * prs + px * p_step;
1194                                 *pp = (r * a + *pp * (256-a)) >> 8;
1195                                 pp++;
1196                                 *pp = (g * a + *pp * (256-a)) >> 8;
1197                                 pp++;
1198                                 *pp = (b * a + *pp * (256-a)) >> 8;
1199                                 }
1200                         }
1201                 }
1202         else
1203                 {
1204                 if (ry1 > ry2)
1205                         {
1206                         gdouble t;
1207                         t = rx1; rx1 = rx2; rx2 = t;
1208                         t = ry1; ry1 = ry2; ry2 = t;
1209                         }
1210
1211                 slope = ry2 - ry1;
1212                 if (slope != 0.0) slope = (rx2 - rx1) / slope;
1213                 for (y = ry1; y < ry2; y += 1.0)
1214                         {
1215                         px = (gint)(rx1 + (y - ry1) * slope + 0.5);
1216                         py = (gint)(y + 0.5);
1217
1218                         if (px >=  cx1 && px < cx2 && py >= cy1 && py < cy2)
1219                                 {
1220                                 pp = p_pix + py * prs + px * p_step;
1221                                 *pp = (r * a + *pp * (256-a)) >> 8;
1222                                 pp++;
1223                                 *pp = (g * a + *pp * (256-a)) >> 8;
1224                                 pp++;
1225                                 *pp = (b * a + *pp * (256-a)) >> 8;
1226                                 }
1227                         }
1228                 }
1229 }
1230
1231 /*
1232  *-----------------------------------------------------------------------------
1233  * pixbuf drawing (fades and shadows)
1234  *-----------------------------------------------------------------------------
1235  */
1236
1237 static void pixbuf_draw_fade_linear(guchar *p_pix, gint prs, gboolean has_alpha,
1238                                     gint s, gboolean vertical, gint border,
1239                                     gint x1, gint y1, gint x2, gint y2,
1240                                     guint8 r, guint8 g, guint8 b, guint8 a)
1241 {
1242         guchar *pp;
1243         gint p_step;
1244         guint8 n = a;
1245         gint i, j;
1246
1247         p_step = (has_alpha) ? 4 : 3;
1248         for (j = y1; j < y2; j++)
1249                 {
1250                 pp = p_pix + j * prs + x1 * p_step;
1251                 if (!vertical) n = a - a * abs(j - s) / border;
1252                 for (i = x1; i < x2; i++)
1253                         {
1254                         if (vertical) n = a - a * abs(i - s) / border;
1255                         *pp = (r * n + *pp * (256-n)) >> 8;
1256                         pp++;
1257                         *pp = (g * n + *pp * (256-n)) >> 8;
1258                         pp++;
1259                         *pp = (b * n + *pp * (256-n)) >> 8;
1260                         pp++;
1261                         if (has_alpha) pp++;
1262                         }
1263                 }
1264 }
1265
1266 static void pixbuf_draw_fade_radius(guchar *p_pix, gint prs, gboolean has_alpha,
1267                                     gint sx, gint sy, gint border,
1268                                     gint x1, gint y1, gint x2, gint y2,
1269                                     guint8 r, guint8 g, guint8 b, guint8 a)
1270 {
1271         guchar *pp;
1272         gint p_step;
1273         gint i, j;
1274
1275         p_step = (has_alpha) ? 4 : 3;
1276         for (j = y1; j < y2; j++)
1277                 {
1278                 pp = p_pix + j * prs + x1 * p_step;
1279                 for (i = x1; i < x2; i++)
1280                         {
1281                         guint8 n;
1282                         gint r;
1283
1284                         r = MIN(border, (gint)sqrt((i-sx)*(i-sx) + (j-sy)*(j-sy)));
1285                         n = a - a * r / border;
1286                         *pp = (r * n + *pp * (256-n)) >> 8;
1287                         pp++;
1288                         *pp = (g * n + *pp * (256-n)) >> 8;
1289                         pp++;
1290                         *pp = (b * n + *pp * (256-n)) >> 8;
1291                         pp++;
1292                         if (has_alpha) pp++;
1293                         }
1294                 }
1295 }
1296
1297 void pixbuf_draw_shadow(GdkPixbuf *pb,
1298                         gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1299                         gint x, gint y, gint w, gint h, gint border,
1300                         guint8 r, guint8 g, guint8 b, guint8 a)
1301 {
1302         gint has_alpha;
1303         gint pw, ph, prs;
1304         gint rx, ry, rw, rh;
1305         gint fx, fy, fw, fh;
1306         guchar *p_pix;
1307
1308         if (!pb) return;
1309
1310         pw = gdk_pixbuf_get_width(pb);
1311         ph = gdk_pixbuf_get_height(pb);
1312
1313         if (!util_clip_region(0, 0, pw, ph,
1314                               clip_x, clip_y, clip_w, clip_h,
1315                               &rx, &ry, &rw, &rh)) return;
1316
1317         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1318         prs = gdk_pixbuf_get_rowstride(pb);
1319         p_pix = gdk_pixbuf_get_pixels(pb);
1320
1321         if (util_clip_region(x + border, y + border, w - border * 2, h - border * 2,
1322                              rx, ry, rw, rh,
1323                              &fx, &fy, &fw, &fh))
1324                 {
1325                 pixbuf_draw_rect_fill(pb, fx, fy, fw, fh, r, g, b, a);
1326                 }
1327
1328         if (border < 1) return;
1329
1330         if (util_clip_region(x, y + border, border, h - border * 2,
1331                              rx, ry, rw, rh,
1332                              &fx, &fy, &fw, &fh))
1333                 {
1334                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1335                                         x + border, TRUE, border,
1336                                         fx, fy, fx + fw, fy + fh,
1337                                         r, g, b, a);
1338                 }
1339         if (util_clip_region(x + w - border, y + border, border, h - border * 2,
1340                              rx, ry, rw, rh,
1341                              &fx, &fy, &fw, &fh))
1342                 {
1343                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1344                                         x + w - border, TRUE, border,
1345                                         fx, fy, fx + fw, fy + fh,
1346                                         r, g, b, a);
1347                 }
1348         if (util_clip_region(x + border, y, w - border * 2, border,
1349                              rx, ry, rw, rh,
1350                              &fx, &fy, &fw, &fh))
1351                 {
1352                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1353                                         y + border, FALSE, border,
1354                                         fx, fy, fx + fw, fy + fh,
1355                                         r, g, b, a);
1356                 }
1357         if (util_clip_region(x + border, y + h - border, w - border * 2, border,
1358                              rx, ry, rw, rh,
1359                              &fx, &fy, &fw, &fh))
1360                 {
1361                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1362                                         y + h - border, FALSE, border,
1363                                         fx, fy, fx + fw, fy + fh,
1364                                         r, g, b, a);
1365                 }
1366         if (util_clip_region(x, y, border, border,
1367                              rx, ry, rw, rh,
1368                              &fx, &fy, &fw, &fh))
1369                 {
1370                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1371                                         x + border, y + border, border,
1372                                         fx, fy, fx + fw, fy + fh,
1373                                         r, g, b, a);
1374                 }
1375         if (util_clip_region(x + w - border, y, border, border,
1376                              rx, ry, rw, rh,
1377                              &fx, &fy, &fw, &fh))
1378                 {
1379                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1380                                         x + w - border, y + border, border,
1381                                         fx, fy, fx + fw, fy + fh,
1382                                         r, g, b, a);
1383                 }
1384         if (util_clip_region(x, y + h - border, border, border,
1385                              rx, ry, rw, rh,
1386                              &fx, &fy, &fw, &fh))
1387                 {
1388                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1389                                         x + border, y + h - border, border,
1390                                         fx, fy, fx + fw, fy + fh,
1391                                         r, g, b, a);
1392                 }
1393         if (util_clip_region(x + w - border, y + h - border, border, border,
1394                              rx, ry, rw, rh,
1395                              &fx, &fy, &fw, &fh))
1396                 {
1397                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1398                                         x + w - border, y + h - border, border,
1399                                         fx, fy, fx + fw, fy + fh,
1400                                         r, g, b, a);
1401                 }
1402 }
1403
1404
1405 /*
1406  *-----------------------------------------------------------------------------
1407  * pixbuf color alterations
1408  *-----------------------------------------------------------------------------
1409  */
1410
1411 void pixbuf_desaturate_rect(GdkPixbuf *pb,
1412                             gint x, gint y, gint w, gint h)
1413 {
1414         gboolean has_alpha;
1415         gint pw, ph, prs;
1416         guchar *p_pix;
1417         guchar *pp;
1418         gint i, j;
1419
1420         if (!pb) return;
1421
1422         pw = gdk_pixbuf_get_width(pb);
1423         ph = gdk_pixbuf_get_height(pb);
1424
1425         if (x < 0 || x + w > pw) return;
1426         if (y < 0 || y + h > ph) return;
1427
1428         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1429         prs = gdk_pixbuf_get_rowstride(pb);
1430         p_pix = gdk_pixbuf_get_pixels(pb);
1431
1432         for (i = 0; i < h; i++)
1433                 {
1434                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
1435                 for (j = 0; j < w; j++)
1436                         {
1437                         guint8 grey;
1438
1439                         grey = (pp[0] + pp[1] + pp[2]) / 3;
1440                         *pp = grey;
1441                         pp++;
1442                         *pp = grey;
1443                         pp++;
1444                         *pp = grey;
1445                         pp++;
1446                         if (has_alpha) pp++;
1447                         }
1448                 }
1449 }
1450 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */