src/pixbuf-util.cc

   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
  25 #include "exif.h"
  26 #include "filedata.h"
  27 #include "ui-fileops.h"
  28
  29 #include <cmath>
  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 = nullptr;
  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 #pragma GCC diagnostic push
  64 #pragma GCC diagnostic ignored "-Wunused-function"
  65 gboolean pixbuf_to_file_as_jpg_unused(GdkPixbuf *pixbuf, const gchar *filename, gint quality)
  66 {
  67         GError *error = nullptr;
  68         gchar *qbuf;
  69         gboolean ret;
  70
  71         if (!pixbuf || !filename) return FALSE;
  72
  73         if (quality == -1) quality = 75;
  74         if (quality < 1 || quality > 100)
  75                 {
  76                 log_printf("Jpeg not saved, invalid quality %d\n", quality);
  77                 return FALSE;
  78                 }
  79
  80         qbuf = g_strdup_printf("%d", quality);
  81         ret = gdk_pixbuf_save(pixbuf, filename, "jpeg", &error, "quality", qbuf, NULL);
  82         g_free(qbuf);
  83
  84         if (error)
  85                 {
  86                 log_printf("Error saving jpeg to %s\n%s\n", filename, error->message);
  87                 g_error_free(error);
  88                 }
  89
  90         return ret;
  91 }
  92 #pragma GCC diagnostic pop
  93
  94 /*
  95  *-----------------------------------------------------------------------------
  96  * pixbuf from inline
  97  *-----------------------------------------------------------------------------
  98  */
  99
 100 struct PixbufInline
 101 {
 102         const gchar *key;
 103         const gchar *data;
 104 };
 105
 106 static PixbufInline inline_pixbuf_data[] = {
 107         {  PIXBUF_INLINE_ARCHIVE,                "gq-icon-archive-file" },
 108         {  PIXBUF_INLINE_BROKEN,                 "gq-icon-broken" },
 109         {  PIXBUF_INLINE_COLLECTION,             "gq-icon-collection" },
 110         {  PIXBUF_INLINE_ICON_180,               "gq-icon-rotate-180" },
 111         {  PIXBUF_INLINE_ICON_BOOK,              "gq-icon-book" },
 112         {  PIXBUF_INLINE_ICON_CONFIG,            "gq-icon-config" },
 113         {  PIXBUF_INLINE_ICON_DRAW_RECTANGLE,    "gq-icon-draw-rectangle" },
 114         {  PIXBUF_INLINE_ICON_EXIF,              "gq-icon-exif" },
 115         {  PIXBUF_INLINE_ICON_EXPOSURE,          "gq-icon-exposure" },
 116         {  PIXBUF_INLINE_ICON_FLOAT,             "gq-icon-float" },
 117         {  PIXBUF_INLINE_ICON,                   "gqview-icon" },
 118         {  PIXBUF_INLINE_ICON_GRAYSCALE,         "gq-icon-grayscale" },
 119         {  PIXBUF_INLINE_ICON_HEIF,              "gq-icon-heic" },
 120         {  PIXBUF_INLINE_ICON_HIDETOOLS,         "gq-icon-hidetools" },
 121         {  PIXBUF_INLINE_ICON_MAINTENANCE,       "gq-icon-maintenance" },
 122         {  PIXBUF_INLINE_ICON_MARKS,             "gq-icon-marks" },
 123         {  PIXBUF_INLINE_ICON_MOVE,              "gq-icon-move" },
 124         {  PIXBUF_INLINE_ICON_ORIGINAL,          "gq-icon-original" },
 125         {  PIXBUF_INLINE_ICON_PANORAMA,          "gq-icon-panorama" },
 126         {  PIXBUF_INLINE_ICON_PDF,               "gq-icon-pdf" },
 127         {  PIXBUF_INLINE_ICON_PROPERTIES,        "gq-icon-properties" },
 128         {  PIXBUF_INLINE_ICON_RENAME,            "gq-icon-rename" },
 129         {  PIXBUF_INLINE_ICON_SELECT_ALL,        "gq-icon-select-all" },
 130         {  PIXBUF_INLINE_ICON_SELECT_INVERT,     "gq-icon-select-invert" },
 131         {  PIXBUF_INLINE_ICON_SELECT_NONE,       "gq-icon-select-none" },
 132         {  PIXBUF_INLINE_ICON_SELECT_RECTANGLE,  "gq-icon-select-rectangle" },
 133         {  PIXBUF_INLINE_ICON_SORT,              "gq-icon-sort" },
 134         {  PIXBUF_INLINE_ICON_THUMB,             "gq-icon-thumb" },
 135         {  PIXBUF_INLINE_ICON_TOOLS,             "gq-icon-tools" },
 136         {  PIXBUF_INLINE_ICON_VIEW,              "gq-icon-view" },
 137         {  PIXBUF_INLINE_ICON_ZOOMFILLHOR,       "gq-icon-zoomfillhor" },
 138         {  PIXBUF_INLINE_ICON_ZOOMFILLVERT,      "gq-icon-zoomfillvert" },
 139         {  PIXBUF_INLINE_LOGO,                   "geeqie-logo" },
 140         {  PIXBUF_INLINE_METADATA,               "gq-icon-metadata" },
 141         {  PIXBUF_INLINE_SCROLLER,               "gq-scroller" },
 142         {  PIXBUF_INLINE_SPLIT_PANE_SYNC,        "gq-icon-split-pane-sync" },
 143         {  PIXBUF_INLINE_UNKNOWN,                "gq-icon-unknown" },
 144         {  PIXBUF_INLINE_VIDEO,                  "gq-icon-video" },
 145         {  nullptr,                              nullptr }
 146 };
 147
 148 GdkPixbuf *pixbuf_inline(const gchar *key)
 149 {
 150         gboolean dark = FALSE;
 151         gchar *file_name = nullptr;
 152         gchar *path;
 153         gchar *theme_name;
 154         GdkPixbuf *icon_pixbuf;
 155         GError *error = nullptr;
 156         GInputStream *in_stream;
 157         gint i;
 158         GtkSettings *settings;
 159
 160         if (!key) return nullptr;
 161
 162         settings = gtk_settings_get_default();
 163         g_object_get(settings, "gtk-theme-name", &theme_name, nullptr);
 164         dark = g_str_has_suffix(theme_name, "dark");
 165         g_free(theme_name);
 166
 167         i = 0;
 168         while (inline_pixbuf_data[i].key)
 169                 {
 170                 if (strcmp(inline_pixbuf_data[i].key, key) == 0)
 171                         {
 172                         file_name = g_strconcat(inline_pixbuf_data[i].data, dark ? "-dark" : "", ".png", nullptr);
 173                         path = g_build_filename(GQ_RESOURCE_PATH_ICONS, file_name, nullptr);
 174                         g_free(file_name);
 175
 176                         in_stream = g_resources_open_stream(path, G_RESOURCE_LOOKUP_FLAGS_NONE, &error);
 177                         g_free(path);
 178
 179                         if (error)
 180                                 {
 181                                 g_error_free(error);
 182                                 error = nullptr;
 183
 184                                 file_name = g_strconcat(inline_pixbuf_data[i].data, ".png", nullptr);
 185                                 path = g_build_filename(GQ_RESOURCE_PATH_ICONS, file_name, nullptr);
 186                                 g_free(file_name);
 187
 188                                 in_stream = g_resources_open_stream(path, G_RESOURCE_LOOKUP_FLAGS_NONE, &error);
 189                                 g_free(path);
 190                                 }
 191
 192                         if (error)
 193                                 {
 194                                 log_printf("warning: inline pixbuf error: %s", error->message);
 195                                 g_error_free(error);
 196                                 g_object_unref(in_stream);
 197                                 return nullptr;
 198                                 }
 199
 200                         icon_pixbuf = gdk_pixbuf_new_from_stream(in_stream, nullptr, &error);
 201                         g_object_unref(in_stream);
 202
 203                         if (error)
 204                                 {
 205                                 log_printf("warning: inline pixbuf error: %s", error->message);
 206                                 g_error_free(error);
 207                                 return nullptr;
 208                                 }
 209
 210                         return icon_pixbuf;
 211                         }
 212                 i++;
 213                 }
 214
 215         log_printf("warning: inline pixbuf key \"%s\" not found.\n", key);
 216
 217         return nullptr;
 218 }
 219
 220 static void register_stock_icon(const gchar *key, GdkPixbuf *pixbuf)
 221 {
 222         static GtkIconFactory *icon_factory = nullptr;
 223         GtkIconSet *icon_set;
 224
 225         if (!icon_factory)
 226                 {
 227                 icon_factory = gtk_icon_factory_new();
 228                 gtk_icon_factory_add_default(icon_factory);
 229                 }
 230
 231         icon_set = gtk_icon_set_new_from_pixbuf(pixbuf);
 232         gtk_icon_factory_add(icon_factory, key, icon_set);
 233 }
 234
 235
 236 void pixbuf_inline_register_stock_icons()
 237 {
 238         gint i;
 239
 240         i = 0;
 241         while (inline_pixbuf_data[i].key)
 242                 {
 243                 register_stock_icon(inline_pixbuf_data[i].key, pixbuf_inline(inline_pixbuf_data[i].key));
 244                 i++;
 245                 }
 246 }
 247
 248 gboolean register_theme_icon_as_stock(const gchar *key, const gchar *icon)
 249 {
 250         GtkIconTheme *icon_theme;
 251         GdkPixbuf *pixbuf;
 252         GError *error = nullptr;
 253
 254         icon_theme = gtk_icon_theme_get_default();
 255
 256         if (gtk_icon_theme_has_icon(icon_theme, key)) return FALSE;
 257
 258         pixbuf = gtk_icon_theme_load_icon(icon_theme,
 259                            icon, /* icon name */
 260                            64, /* size */
 261                            static_cast<GtkIconLookupFlags>(0),  /* flags */
 262                            &error);
 263         if (!pixbuf)
 264                 {
 265                 if (error)
 266                         {
 267                         DEBUG_1("Couldn't load icon %s: %s", icon, error->message);
 268                         g_error_free(error);
 269                         error = nullptr;
 270                         }
 271
 272                 if (strchr(icon, '.'))
 273                         {
 274                         /* try again without extension */
 275                         gchar *icon2 = remove_extension_from_path(icon);
 276                         pixbuf = gtk_icon_theme_load_icon(icon_theme,
 277                                            icon2, /* icon name */
 278                                            64, /* size */
 279                                            static_cast<GtkIconLookupFlags>(0),  /* flags */
 280                                            &error);
 281                         if (error)
 282                                 {
 283                                 DEBUG_1("Couldn't load icon %s: %s", icon2, error->message);
 284                                 g_error_free(error);
 285                                 error = nullptr;
 286
 287                                 /* try as an absolute path */
 288                                 pixbuf = gdk_pixbuf_new_from_file(icon, &error);
 289                                 if (error)
 290                                         {
 291                                         DEBUG_1("Couldn't load icon as absolute path %s: %s", icon, error->message);
 292                                         g_error_free(error);
 293                                         }
 294                                 }
 295                         g_free(icon2);
 296                         }
 297                 }
 298
 299         if (!pixbuf) return FALSE;
 300
 301         register_stock_icon(key, pixbuf);
 302         return TRUE;
 303 }
 304
 305 gboolean pixbuf_scale_aspect(gint req_w, gint req_h,
 306                              gint old_w, gint old_h,
 307                              gint *new_w, gint *new_h)
 308 {
 309         if ((static_cast<gdouble>(req_w) / old_w) < (static_cast<gdouble>(req_h) / old_h))
 310                 {
 311                 *new_w = req_w;
 312                 *new_h = static_cast<gdouble>(*new_w) / old_w * old_h;
 313                 if (*new_h < 1) *new_h = 1;
 314                 }
 315         else
 316                 {
 317                 *new_h = req_h;
 318                 *new_w = static_cast<gdouble>(*new_h) / old_h * old_w;
 319                 if (*new_w < 1) *new_w = 1;
 320                 }
 321
 322         return (*new_w != old_w || *new_h != old_h);
 323 }
 324
 325 GdkPixbuf *pixbuf_fallback(FileData *fd, gint requested_width, gint requested_height)
 326 {
 327         GdkPixbuf *pixbuf;
 328
 329         switch (fd->format_class)
 330                 {
 331                 case FORMAT_CLASS_UNKNOWN:
 332                         pixbuf = pixbuf_inline(PIXBUF_INLINE_UNKNOWN);
 333                         break;
 334                 case FORMAT_CLASS_META:
 335                         pixbuf = pixbuf_inline(PIXBUF_INLINE_METADATA);
 336                         break;
 337                 case FORMAT_CLASS_VIDEO:
 338                         pixbuf = pixbuf_inline(PIXBUF_INLINE_VIDEO);
 339                         break;
 340                 case FORMAT_CLASS_COLLECTION:
 341                         pixbuf = pixbuf_inline(PIXBUF_INLINE_COLLECTION);
 342                         break;
 343                 case FORMAT_CLASS_DOCUMENT:
 344                         pixbuf = pixbuf_inline(PIXBUF_INLINE_ICON_PDF);
 345                         break;
 346                 case FORMAT_CLASS_ARCHIVE:
 347                         pixbuf = pixbuf_inline(PIXBUF_INLINE_ARCHIVE);
 348                         break;
 349                 default:
 350                         pixbuf = pixbuf_inline(PIXBUF_INLINE_BROKEN);
 351                 }
 352
 353         if (requested_width && requested_height)
 354                 {
 355                 gint w = gdk_pixbuf_get_width(pixbuf);
 356                 gint h = gdk_pixbuf_get_height(pixbuf);
 357
 358                 if (w > requested_width || h > requested_height)
 359                         {
 360                         gint nw, nh;
 361
 362                         if (pixbuf_scale_aspect(requested_width, requested_height,
 363                                                           w, h, &nw, &nh))
 364                                 {
 365                                 GdkPixbuf *tmp;
 366
 367                                 tmp = pixbuf;
 368                                 pixbuf = gdk_pixbuf_scale_simple(tmp, nw, nh, GDK_INTERP_TILES);
 369                                 g_object_unref(G_OBJECT(tmp));
 370                                 }
 371                         }
 372                 }
 373         return pixbuf;
 374 }
 375
 376
 377 /*
 378  *-----------------------------------------------------------------------------
 379  * misc utils
 380  *-----------------------------------------------------------------------------
 381  */
 382
 383 gboolean util_clip_region(gint x, gint y, gint w, gint h,
 384                           gint clip_x, gint clip_y, gint clip_w, gint clip_h,
 385                           gint *rx, gint *ry, gint *rw, gint *rh)
 386 {
 387         if (clip_x + clip_w <= x ||
 388             clip_x >= x + w ||
 389             clip_y + clip_h <= y ||
 390             clip_y >= y + h)
 391                 {
 392                 return FALSE;
 393                 }
 394
 395         *rx = MAX(x, clip_x);
 396         *rw = MIN((x + w), (clip_x + clip_w)) - *rx;
 397
 398         *ry = MAX(y, clip_y);
 399         *rh = MIN((y + h), (clip_y + clip_h)) - *ry;
 400
 401         return TRUE;
 402 }
 403
 404 /*
 405  *-----------------------------------------------------------------------------
 406  * pixbuf rotation
 407  *-----------------------------------------------------------------------------
 408  */
 409
 410 static void pixbuf_copy_block_rotate(guchar *src, gint src_row_stride, gint x, gint y,
 411                                      guchar *dest, gint dest_row_stride, gint w, gint h,
 412                                      gint bytes_per_pixel, gboolean counter_clockwise)
 413 {
 414         gint i, j;
 415         guchar *sp;
 416         guchar *dp;
 417
 418         for (i = 0; i < h; i++)
 419                 {
 420                 sp = src + ((i + y) * src_row_stride) + (x * bytes_per_pixel);
 421                 for (j = 0; j < w; j++)
 422                         {
 423                         if (counter_clockwise)
 424                                 {
 425                                 dp = dest + ((w - j - 1) * dest_row_stride) + (i * bytes_per_pixel);
 426                                 }
 427                         else
 428                                 {
 429                                 dp = dest + (j * dest_row_stride) + ((h - i - 1) * bytes_per_pixel);
 430                                 }
 431                         *(dp++) = *(sp++);      /* r */
 432                         *(dp++) = *(sp++);      /* g */
 433                         *(dp++) = *(sp++);      /* b */
 434                         if (bytes_per_pixel == 4) *(dp) = *(sp++);      /* a */
 435                         }
 436                 }
 437
 438 }
 439
 440 static void pixbuf_copy_block(guchar *src, gint src_row_stride, gint w, gint h,
 441                               guchar *dest, gint dest_row_stride, gint x, gint y, gint bytes_per_pixel)
 442 {
 443         gint i;
 444         guchar *sp;
 445         guchar *dp;
 446
 447         for (i = 0; i < h; i++)
 448                 {
 449                 sp = src + (i * src_row_stride);
 450                 dp = dest + ((y + i) * dest_row_stride) + (x * bytes_per_pixel);
 451                 memcpy(dp, sp, w * bytes_per_pixel);
 452                 }
 453 }
 454
 455 enum {
 456         ROTATE_BUFFER_WIDTH = 48,
 457         ROTATE_BUFFER_HEIGHT = 48
 458 };
 459
 460 /*
 461  * Returns a copy of pixbuf src rotated 90 degrees clockwise or 90 counterclockwise
 462  *
 463  */
 464 GdkPixbuf *pixbuf_copy_rotate_90(GdkPixbuf *src, gboolean counter_clockwise)
 465 {
 466         GdkPixbuf *dest;
 467         gboolean has_alpha;
 468         gint sw, sh, srs;
 469         gint dw, dh, drs;
 470         guchar *s_pix;
 471         guchar *d_pix;
 472         gint i, j;
 473         gint a;
 474         GdkPixbuf *buffer;
 475         guchar *b_pix;
 476         gint brs;
 477         gint w, h;
 478
 479         if (!src) return nullptr;
 480
 481         sw = gdk_pixbuf_get_width(src);
 482         sh = gdk_pixbuf_get_height(src);
 483         has_alpha = gdk_pixbuf_get_has_alpha(src);
 484         srs = gdk_pixbuf_get_rowstride(src);
 485         s_pix = gdk_pixbuf_get_pixels(src);
 486
 487         dw = sh;
 488         dh = sw;
 489         dest = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8, dw, dh);
 490         drs = gdk_pixbuf_get_rowstride(dest);
 491         d_pix = gdk_pixbuf_get_pixels(dest);
 492
 493         a = (has_alpha ? 4 : 3);
 494
 495         buffer = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8,
 496                                 ROTATE_BUFFER_WIDTH, ROTATE_BUFFER_HEIGHT);
 497         b_pix = gdk_pixbuf_get_pixels(buffer);
 498         brs = gdk_pixbuf_get_rowstride(buffer);
 499
 500         for (i = 0; i < sh; i+= ROTATE_BUFFER_WIDTH)
 501                 {
 502                 w = MIN(ROTATE_BUFFER_WIDTH, (sh - i));
 503                 for (j = 0; j < sw; j += ROTATE_BUFFER_HEIGHT)
 504                         {
 505                         gint x, y;
 506
 507                         h = MIN(ROTATE_BUFFER_HEIGHT, (sw - j));
 508                         pixbuf_copy_block_rotate(s_pix, srs, j, i,
 509                                                  b_pix, brs, h, w,
 510                                                  a, counter_clockwise);
 511
 512                         if (counter_clockwise)
 513                                 {
 514                                 x = i;
 515                                 y = sw - h - j;
 516                                 }
 517                         else
 518                                 {
 519                                 x = sh - w - i;
 520                                 y = j;
 521                                 }
 522                         pixbuf_copy_block(b_pix, brs, w, h,
 523                                           d_pix, drs, x, y, a);
 524                         }
 525                 }
 526
 527         g_object_unref(buffer);
 528
 529 #if 0
 530         /* this is the simple version of rotation (roughly 2-4x slower) */
 531
 532         for (i = 0; i < sh; i++)
 533                 {
 534                 sp = s_pix + (i * srs);
 535                 for (j = 0; j < sw; j++)
 536                         {
 537                         if (counter_clockwise)
 538                                 {
 539                                 dp = d_pix + ((dh - j - 1) * drs) + (i * a);
 540                                 }
 541                         else
 542                                 {
 543                                 dp = d_pix + (j * drs) + ((dw - i - 1) * a);
 544                                 }
 545
 546                         *(dp++) = *(sp++);      /* r */
 547                         *(dp++) = *(sp++);      /* g */
 548                         *(dp++) = *(sp++);      /* b */
 549                         if (has_alpha) *(dp) = *(sp++); /* a */
 550                         }
 551                 }
 552 #endif
 553
 554         return dest;
 555 }
 556
 557 /*
 558  * Returns a copy of pixbuf mirrored and or flipped.
 559  * TO do a 180 degree rotations set both mirror and flipped TRUE
 560  * if mirror and flip are FALSE, result is a simple copy.
 561  */
 562 GdkPixbuf *pixbuf_copy_mirror(GdkPixbuf *src, gboolean mirror, gboolean flip)
 563 {
 564         GdkPixbuf *dest;
 565         gboolean has_alpha;
 566         gint w, h, srs;
 567         gint drs;
 568         guchar *s_pix;
 569         guchar *d_pix;
 570         guchar *sp;
 571         guchar *dp;
 572         gint i, j;
 573         gint a;
 574
 575         if (!src) return nullptr;
 576
 577         w = gdk_pixbuf_get_width(src);
 578         h = gdk_pixbuf_get_height(src);
 579         has_alpha = gdk_pixbuf_get_has_alpha(src);
 580         srs = gdk_pixbuf_get_rowstride(src);
 581         s_pix = gdk_pixbuf_get_pixels(src);
 582
 583         dest = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8, w, h);
 584         drs = gdk_pixbuf_get_rowstride(dest);
 585         d_pix = gdk_pixbuf_get_pixels(dest);
 586
 587         a = has_alpha ? 4 : 3;
 588
 589         for (i = 0; i < h; i++)
 590                 {
 591                 sp = s_pix + (i * srs);
 592                 if (flip)
 593                         {
 594                         dp = d_pix + ((h - i - 1) * drs);
 595                         }
 596                 else
 597                         {
 598                         dp = d_pix + (i * drs);
 599                         }
 600                 if (mirror)
 601                         {
 602                         dp += (w - 1) * a;
 603                         for (j = 0; j < w; j++)
 604                                 {
 605                                 *(dp++) = *(sp++);      /* r */
 606                                 *(dp++) = *(sp++);      /* g */
 607                                 *(dp++) = *(sp++);      /* b */
 608                                 if (has_alpha) *(dp) = *(sp++); /* a */
 609                                 dp -= (a + 3);
 610                                 }
 611                         }
 612                 else
 613                         {
 614                         for (j = 0; j < w; j++)
 615                                 {
 616                                 *(dp++) = *(sp++);      /* r */
 617                                 *(dp++) = *(sp++);      /* g */
 618                                 *(dp++) = *(sp++);      /* b */
 619                                 if (has_alpha) *(dp++) = *(sp++);       /* a */
 620                                 }
 621                         }
 622                 }
 623
 624         return dest;
 625 }
 626
 627 GdkPixbuf *pixbuf_apply_orientation(GdkPixbuf *pixbuf, gint orientation)
 628 {
 629         GdkPixbuf *dest;
 630         GdkPixbuf *tmp = nullptr;
 631
 632         switch (orientation)
 633                 {
 634                 case EXIF_ORIENTATION_TOP_LEFT:
 635                         dest = gdk_pixbuf_copy(pixbuf);
 636                         break;
 637                 case EXIF_ORIENTATION_TOP_RIGHT:
 638                         /* mirrored */
 639                         dest = pixbuf_copy_mirror(pixbuf, TRUE, FALSE);
 640                         break;
 641                 case EXIF_ORIENTATION_BOTTOM_RIGHT:
 642                         /* upside down */
 643                         dest = pixbuf_copy_mirror(pixbuf, TRUE, TRUE);
 644                         break;
 645                 case EXIF_ORIENTATION_BOTTOM_LEFT:
 646                         /* flipped */
 647                         dest = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 648                         break;
 649                 case EXIF_ORIENTATION_LEFT_TOP:
 650                         tmp = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 651                         dest = pixbuf_copy_rotate_90(tmp, FALSE);
 652                         break;
 653                 case EXIF_ORIENTATION_RIGHT_TOP:
 654                         /* rotated -90 (270) */
 655                         dest = pixbuf_copy_rotate_90(pixbuf, FALSE);
 656                         break;
 657                 case EXIF_ORIENTATION_RIGHT_BOTTOM:
 658                         tmp = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 659                         dest = pixbuf_copy_rotate_90(tmp, TRUE);
 660                         break;
 661                 case EXIF_ORIENTATION_LEFT_BOTTOM:
 662                         /* rotated 90 */
 663                         dest = pixbuf_copy_rotate_90(pixbuf, TRUE);
 664                         break;
 665                 default:
 666                         dest = gdk_pixbuf_copy(pixbuf);
 667                         break;
 668                 }
 669         if (tmp) g_object_unref(tmp);
 670         return dest;
 671
 672 }
 673
 674
 675 /*
 676  *-----------------------------------------------------------------------------
 677  * pixbuf drawing (rectangles)
 678  *-----------------------------------------------------------------------------
 679  */
 680
 681 /*
 682  * Fills region of pixbuf at x,y over w,h
 683  * with colors red (r), green (g), blue (b)
 684  * applying alpha (a), use a=255 for solid.
 685  */
 686 void pixbuf_draw_rect_fill(GdkPixbuf *pb,
 687                            gint x, gint y, gint w, gint h,
 688                            gint r, gint g, gint b, gint a)
 689 {
 690         gboolean has_alpha;
 691         gint pw, ph, prs;
 692         guchar *p_pix;
 693         guchar *pp;
 694         gint i, j;
 695
 696         if (!pb) return;
 697
 698         pw = gdk_pixbuf_get_width(pb);
 699         ph = gdk_pixbuf_get_height(pb);
 700
 701         if (x < 0 || x + w > pw) return;
 702         if (y < 0 || y + h > ph) return;
 703
 704         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 705         prs = gdk_pixbuf_get_rowstride(pb);
 706         p_pix = gdk_pixbuf_get_pixels(pb);
 707
 708         for (i = 0; i < h; i++)
 709                 {
 710                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
 711                 for (j = 0; j < w; j++)
 712                         {
 713                         *pp = (r * a + *pp * (256-a)) >> 8;
 714                         pp++;
 715                         *pp = (g * a + *pp * (256-a)) >> 8;
 716                         pp++;
 717                         *pp = (b * a + *pp * (256-a)) >> 8;
 718                         pp++;
 719                         if (has_alpha) pp++;
 720                         }
 721                 }
 722 }
 723
 724 #pragma GCC diagnostic push
 725 #pragma GCC diagnostic ignored "-Wunused-function"
 726 void pixbuf_draw_rect_unused(GdkPixbuf *pb,
 727                       gint x, gint y, gint w, gint h,
 728                       gint r, gint g, gint b, gint a,
 729                       gint left, gint right, gint top, gint bottom)
 730 {
 731         pixbuf_draw_rect_fill(pb, x + left, y, w - left - right, top,
 732                               r, g, b ,a);
 733         pixbuf_draw_rect_fill(pb, x + w - right, y, right, h,
 734                               r, g, b ,a);
 735         pixbuf_draw_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
 736                               r, g, b ,a);
 737         pixbuf_draw_rect_fill(pb, x, y, left, h,
 738                               r, g, b ,a);
 739 }
 740 #pragma GCC diagnostic pop
 741
 742 void pixbuf_set_rect_fill(GdkPixbuf *pb,
 743                           gint x, gint y, gint w, gint h,
 744                           gint r, gint g, gint b, gint a)
 745 {
 746         gboolean has_alpha;
 747         gint pw, ph, prs;
 748         guchar *p_pix;
 749         guchar *pp;
 750         gint i, j;
 751
 752         if (!pb) return;
 753
 754         pw = gdk_pixbuf_get_width(pb);
 755         ph = gdk_pixbuf_get_height(pb);
 756
 757         if (x < 0 || x + w > pw) return;
 758         if (y < 0 || y + h > ph) return;
 759
 760         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 761         prs = gdk_pixbuf_get_rowstride(pb);
 762         p_pix = gdk_pixbuf_get_pixels(pb);
 763
 764         for (i = 0; i < h; i++)
 765                 {
 766                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
 767                 for (j = 0; j < w; j++)
 768                         {
 769                         *pp = r; pp++;
 770                         *pp = g; pp++;
 771                         *pp = b; pp++;
 772                         if (has_alpha) { *pp = a; pp++; }
 773                         }
 774                 }
 775 }
 776
 777 void pixbuf_set_rect(GdkPixbuf *pb,
 778                      gint x, gint y, gint w, gint h,
 779                      gint r, gint g, gint b, gint a,
 780                      gint left, gint right, gint top, gint bottom)
 781 {
 782         pixbuf_set_rect_fill(pb, x + left, y, w - left - right, top,
 783                              r, g, b ,a);
 784         pixbuf_set_rect_fill(pb, x + w - right, y, right, h,
 785                              r, g, b ,a);
 786         pixbuf_set_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
 787                              r, g, b ,a);
 788         pixbuf_set_rect_fill(pb, x, y, left, h,
 789                              r, g, b ,a);
 790 }
 791
 792 void pixbuf_pixel_set(GdkPixbuf *pb, gint x, gint y, gint r, gint g, gint b, gint a)
 793 {
 794         guchar *buf;
 795         gboolean has_alpha;
 796         gint rowstride;
 797         guchar *p;
 798
 799         if (x < 0 || x >= gdk_pixbuf_get_width(pb) ||
 800             y < 0 || y >= gdk_pixbuf_get_height(pb)) return;
 801
 802         buf = gdk_pixbuf_get_pixels(pb);
 803         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 804         rowstride = gdk_pixbuf_get_rowstride(pb);
 805
 806         p = buf + (y * rowstride) + (x * (has_alpha ? 4 : 3));
 807         *p = r; p++;
 808         *p = g; p++;
 809         *p = b; p++;
 810         if (has_alpha) *p = a;
 811 }
 812
 813
 814 /*
 815  *-----------------------------------------------------------------------------
 816  * pixbuf text rendering
 817  *-----------------------------------------------------------------------------
 818  */
 819
 820 static void pixbuf_copy_font(GdkPixbuf *src, gint sx, gint sy,
 821                              GdkPixbuf *dest, gint dx, gint dy,
 822                              gint w, gint h,
 823                              guint8 r, guint8 g, guint8 b, guint8 a)
 824 {
 825         gint sw, sh, srs;
 826         gboolean s_alpha;
 827         gint s_step;
 828         guchar *s_pix;
 829         gint dw, dh, drs;
 830         gboolean d_alpha;
 831         gint d_step;
 832         guchar *d_pix;
 833
 834         guchar *sp;
 835         guchar *dp;
 836         gint i, j;
 837
 838         if (!src || !dest) return;
 839
 840         sw = gdk_pixbuf_get_width(src);
 841         sh = gdk_pixbuf_get_height(src);
 842
 843         if (sx < 0 || sx + w > sw) return;
 844         if (sy < 0 || sy + h > sh) return;
 845
 846         dw = gdk_pixbuf_get_width(dest);
 847         dh = gdk_pixbuf_get_height(dest);
 848
 849         if (dx < 0 || dx + w > dw) return;
 850         if (dy < 0 || dy + h > dh) return;
 851
 852         s_alpha = gdk_pixbuf_get_has_alpha(src);
 853         d_alpha = gdk_pixbuf_get_has_alpha(dest);
 854         srs = gdk_pixbuf_get_rowstride(src);
 855         drs = gdk_pixbuf_get_rowstride(dest);
 856         s_pix = gdk_pixbuf_get_pixels(src);
 857         d_pix = gdk_pixbuf_get_pixels(dest);
 858
 859         s_step = (s_alpha) ? 4 : 3;
 860         d_step = (d_alpha) ? 4 : 3;
 861
 862         for (i = 0; i < h; i++)
 863                 {
 864                 sp = s_pix + (sy + i) * srs + sx * s_step;
 865                 dp = d_pix + (dy + i) * drs + dx * d_step;
 866                 for (j = 0; j < w; j++)
 867                         {
 868                         if (*sp)
 869                                 {
 870                                 guint8 asub;
 871
 872                                 asub = a * sp[0] / 255;
 873                                 *dp = (r * asub + *dp * (256-asub)) >> 8;
 874                                 dp++;
 875                                 asub = a * sp[1] / 255;
 876                                 *dp = (g * asub + *dp * (256-asub)) >> 8;
 877                                 dp++;
 878                                 asub = a * sp[2] / 255;
 879                                 *dp = (b * asub + *dp * (256-asub)) >> 8;
 880                                 dp++;
 881
 882                                 if (d_alpha)
 883                                         {
 884                                         *dp = MAX(*dp, a * ((sp[0] + sp[1] + sp[2]) / 3) / 255);
 885                                         dp++;
 886                                         }
 887                                 }
 888                         else
 889                                 {
 890                                 dp += d_step;
 891                                 }
 892
 893                         sp += s_step;
 894                         }
 895                 }
 896 }
 897
 898 void pixbuf_draw_layout(GdkPixbuf *pixbuf, PangoLayout *layout, GtkWidget *,
 899                         gint x, gint y,
 900                         guint8 r, guint8 g, guint8 b, guint8 a)
 901 {
 902         GdkPixbuf *buffer;
 903         gint w, h;
 904         gint sx, sy;
 905         gint dw, dh;
 906         cairo_surface_t *source;
 907         cairo_t *cr;
 908
 909         pango_layout_get_pixel_size(layout, &w, &h);
 910         if (w < 1 || h < 1) return;
 911
 912         source = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
 913
 914         cr = cairo_create (source);
 915         cairo_set_source_rgb(cr, 0, 0, 0);
 916         cairo_rectangle (cr, 0, 0, w, h);
 917         cairo_fill (cr);
 918         cairo_set_source_rgb(cr, 1, 1, 1);
 919         pango_cairo_show_layout (cr, layout);
 920         cairo_destroy (cr);
 921
 922         buffer = gdk_pixbuf_new_from_data (cairo_image_surface_get_data (source),
 923                                            GDK_COLORSPACE_RGB,
 924                                            cairo_image_surface_get_format (source) == CAIRO_FORMAT_ARGB32,
 925                                            8,
 926                                            cairo_image_surface_get_width (source),
 927                                            cairo_image_surface_get_height (source),
 928                                            cairo_image_surface_get_stride (source),
 929                                            nullptr,
 930                                            nullptr);
 931
 932         sx = 0;
 933         sy = 0;
 934         dw = gdk_pixbuf_get_width(pixbuf);
 935         dh = gdk_pixbuf_get_height(pixbuf);
 936
 937         if (x < 0)
 938                 {
 939                 w += x;
 940                 sx = -x;
 941                 x = 0;
 942                 }
 943
 944         if (y < 0)
 945                 {
 946                 h += y;
 947                 sy = -y;
 948                 y = 0;
 949                 }
 950
 951         if (x + w > dw) w = dw - x;
 952         if (y + h > dh) h = dh - y;
 953
 954         pixbuf_copy_font(buffer, sx, sy,
 955                          pixbuf, x, y, w, h,
 956                          r, g, b, a);
 957
 958         g_object_unref(buffer);
 959         cairo_surface_destroy(source);
 960 }
 961
 962 /*
 963  *-----------------------------------------------------------------------------
 964  * pixbuf drawing (triangle)
 965  *-----------------------------------------------------------------------------
 966  */
 967
 968 void util_clip_triangle(gint x1, gint y1, gint x2, gint y2, gint x3, gint y3,
 969                         gint *rx, gint *ry, gint *rw, gint *rh)
 970 {
 971         gint tx, ty, tw, th;
 972
 973         tx = MIN(x1, x2);
 974         tx = MIN(tx, x3);
 975         ty = MIN(y1, y2);
 976         ty = MIN(ty, y3);
 977         tw = MAX(abs(x1 - x2), abs(x2 - x3));
 978         tw = MAX(tw, abs(x3 - x1));
 979         th = MAX(abs(y1 - y2), abs(y2 - y3));
 980         th = MAX(th, abs(y3 - y1));
 981
 982         *rx = tx;
 983         *ry = ty;
 984         *rw = tw;
 985         *rh = th;
 986 }
 987
 988 void pixbuf_draw_triangle(GdkPixbuf *pb,
 989                           gint clip_x, gint clip_y, gint clip_w, gint clip_h,
 990                           gint x1, gint y1, gint x2, gint y2, gint x3, gint y3,
 991                           guint8 r, guint8 g, guint8 b, guint8 a)
 992 {
 993         gboolean has_alpha;
 994         gint pw, ph, prs;
 995         gint rx, ry, rw, rh;
 996         gint tx, ty, tw, th;
 997         gint fx1, fy1;
 998         gint fx2, fy2;
 999         gint fw, fh;
1000         guchar *p_pix;
1001         guchar *pp;
1002         gint p_step;
1003         gdouble slope1, slope2;
1004         gint slope1_x, slope1_y;
1005         gint y;
1006         gint t;
1007         gboolean middle = FALSE;
1008
1009         if (!pb) return;
1010
1011         pw = gdk_pixbuf_get_width(pb);
1012         ph = gdk_pixbuf_get_height(pb);
1013
1014         if (!util_clip_region(0, 0, pw, ph,
1015                               clip_x, clip_y, clip_w, clip_h,
1016                               &rx, &ry, &rw, &rh)) return;
1017
1018         util_clip_triangle(x1, y1, x2, y2, x3, y3,
1019                            &tx, &ty, &tw, &th);
1020
1021         if (!util_clip_region(rx, ry, rw, rh,
1022                               tx, ty, tw, th,
1023                               &fx1, &fy1, &fw, &fh)) return;
1024         fx2 = fx1 + fw;
1025         fy2 = fy1 + fh;
1026
1027         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1028         prs = gdk_pixbuf_get_rowstride(pb);
1029         p_pix = gdk_pixbuf_get_pixels(pb);
1030
1031         p_step = (has_alpha) ? 4 : 3;
1032
1033         if (y1 > y2)
1034                 {
1035                 t = x1; x1 = x2; x2 = t;
1036                 t = y1; y1 = y2; y2 = t;
1037                 }
1038         if (y2 > y3)
1039                 {
1040                 t = x2; x2 = x3; x3 = t;
1041                 t = y2; y2 = y3; y3 = t;
1042                 }
1043         if (y1 > y2)
1044                 {
1045                 t = x1; x1 = x2; x2 = t;
1046                 t = y1; y1 = y2; y2 = t;
1047                 }
1048
1049         slope1 = static_cast<gdouble>(y2 - y1);
1050         if (slope1) slope1 = static_cast<gdouble>(x2 - x1) / slope1;
1051         slope1_x = x1;
1052         slope1_y = y1;
1053         slope2 = static_cast<gdouble>(y3 - y1);
1054         if (slope2) slope2 = static_cast<gdouble>(x3 - x1) / slope2;
1055
1056         for (y = fy1; y < fy2; y++)
1057                 {
1058                 gint xa, xb;
1059
1060                 if (!middle && y > y2)
1061                         {
1062                         slope1 = static_cast<gdouble>(y3 - y2);
1063                         if (slope1) slope1 = static_cast<gdouble>(x3 - x2) / slope1;
1064                         slope1_x = x2;
1065                         slope1_y = y2;
1066
1067                         middle = TRUE;
1068                         }
1069
1070                 xa = slope1_x + (slope1 * (y - slope1_y) + 0.5);
1071                 xb = x1 + (slope2 * (y - y1) + 0.5);
1072
1073                 if (xa > xb)
1074                         {
1075                         t = xa; xa = xb; xb = t;
1076                         }
1077
1078                 xa = CLAMP(xa, fx1, fx2);
1079                 xb = CLAMP(xb, fx1, fx2);
1080
1081                 pp = p_pix + y * prs + xa * p_step;
1082
1083                 while (xa < xb)
1084                         {
1085                         *pp = (r * a + *pp * (256-a)) >> 8;
1086                         pp++;
1087                         *pp = (g * a + *pp * (256-a)) >> 8;
1088                         pp++;
1089                         *pp = (b * a + *pp * (256-a)) >> 8;
1090                         pp++;
1091                         if (has_alpha) pp++;
1092
1093                         xa++;
1094                         }
1095                 }
1096 }
1097
1098 /*
1099  *-----------------------------------------------------------------------------
1100  * pixbuf drawing (line)
1101  *-----------------------------------------------------------------------------
1102  */
1103
1104 static gboolean util_clip_line(gdouble clip_x, gdouble clip_y, gdouble clip_w, gdouble clip_h,
1105                                gdouble x1, gdouble y1, gdouble x2, gdouble y2,
1106                                gdouble *rx1, gdouble *ry1, gdouble *rx2, gdouble *ry2)
1107 {
1108         gboolean flip = FALSE;
1109         gdouble d;
1110
1111         if (x1 > x2)
1112                 {
1113                 gdouble t;
1114
1115                 t = x1; x1 = x2; x2 = t;
1116                 t = y1; y1 = y2; y2 = t;
1117                 flip = TRUE;
1118                 }
1119
1120         if (x2 < clip_x || x1 > clip_x + clip_w) return FALSE;
1121
1122         if (y1 < y2)
1123                 {
1124                 if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
1125                 }
1126         else
1127                 {
1128                 if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
1129                 }
1130
1131         d = x2 - x1;
1132         if (d > 0.0)
1133                 {
1134                 gdouble slope;
1135
1136                 slope = (y2 - y1) / d;
1137                 if (x1 < clip_x)
1138                         {
1139                         y1 = y1 + slope * (clip_x - x1);
1140                         x1 = clip_x;
1141                         }
1142                 if (x2 > clip_x + clip_w)
1143                         {
1144                         y2 = y2 + slope * (clip_x + clip_w - x2);
1145                         x2 = clip_x + clip_w;
1146                         }
1147                 }
1148
1149         if (y1 < y2)
1150                 {
1151                 if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
1152                 }
1153         else
1154                 {
1155                 gdouble t;
1156
1157                 if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
1158
1159                 t = x1; x1 = x2; x2 = t;
1160                 t = y1; y1 = y2; y2 = t;
1161                 flip = !flip;
1162                 }
1163
1164         d = y2 - y1;
1165         if (d > 0.0)
1166                 {
1167                 gdouble slope;
1168
1169                 slope = (x2 - x1) / d;
1170                 if (y1 < clip_y)
1171                         {
1172                         x1 = x1 + slope * (clip_y - y1);
1173                         y1 = clip_y;
1174                         }
1175                 if (y2 > clip_y + clip_h)
1176                         {
1177                         x2 = x2 + slope * (clip_y + clip_h - y2);
1178                         y2 = clip_y + clip_h;
1179                         }
1180                 }
1181
1182         if (flip)
1183                 {
1184                 *rx1 = x2;
1185                 *ry1 = y2;
1186                 *rx2 = x1;
1187                 *ry2 = y1;
1188                 }
1189         else
1190                 {
1191                 *rx1 = x1;
1192                 *ry1 = y1;
1193                 *rx2 = x2;
1194                 *ry2 = y2;
1195                 }
1196
1197         return TRUE;
1198 }
1199
1200 void pixbuf_draw_line(GdkPixbuf *pb,
1201                       gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1202                       gint x1, gint y1, gint x2, gint y2,
1203                       guint8 r, guint8 g, guint8 b, guint8 a)
1204 {
1205         gboolean has_alpha;
1206         gint pw, ph, prs;
1207         gint rx, ry, rw, rh;
1208         gdouble rx1, ry1, rx2, ry2;
1209         guchar *p_pix;
1210         guchar *pp;
1211         gint p_step;
1212         gdouble slope;
1213         gdouble x, y;
1214         gint px, py;
1215         gint cx1, cy1, cx2, cy2;
1216
1217         if (!pb) return;
1218
1219         pw = gdk_pixbuf_get_width(pb);
1220         ph = gdk_pixbuf_get_height(pb);
1221
1222         if (!util_clip_region(0, 0, pw, ph,
1223                               clip_x, clip_y, clip_w, clip_h,
1224                               &rx, &ry, &rw, &rh)) return;
1225         if (!util_clip_line(static_cast<gdouble>(rx), static_cast<gdouble>(ry), static_cast<gdouble>(rw), static_cast<gdouble>(rh),
1226                             static_cast<gdouble>(x1), static_cast<gdouble>(y1), static_cast<gdouble>(x2), static_cast<gdouble>(y2),
1227                             &rx1, &ry1, &rx2, &ry2)) return;
1228
1229         cx1 = rx;
1230         cy1 = ry;
1231         cx2 = rx + rw;
1232         cy2 = ry + rh;
1233
1234         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1235         prs = gdk_pixbuf_get_rowstride(pb);
1236         p_pix = gdk_pixbuf_get_pixels(pb);
1237
1238         p_step = (has_alpha) ? 4 : 3;
1239
1240         if (fabs(rx2 - rx1) > fabs(ry2 - ry1))
1241                 {
1242                 if (rx1 > rx2)
1243                         {
1244                         gdouble t;
1245                         t = rx1; rx1 = rx2; rx2 = t;
1246                         t = ry1; ry1 = ry2; ry2 = t;
1247                         }
1248
1249                 slope = rx2 - rx1;
1250                 if (slope != 0.0) slope = (ry2 - ry1) / slope;
1251                 for (x = rx1; x < rx2; x += 1.0)
1252                         {
1253                         px = static_cast<gint>(x + 0.5);
1254                         py = static_cast<gint>(ry1 + (x - rx1) * slope + 0.5);
1255
1256                         if (px >=  cx1 && px < cx2 && py >= cy1 && py < cy2)
1257                                 {
1258                                 pp = p_pix + py * prs + px * p_step;
1259                                 *pp = (r * a + *pp * (256-a)) >> 8;
1260                                 pp++;
1261                                 *pp = (g * a + *pp * (256-a)) >> 8;
1262                                 pp++;
1263                                 *pp = (b * a + *pp * (256-a)) >> 8;
1264                                 }
1265                         }
1266                 }
1267         else
1268                 {
1269                 if (ry1 > ry2)
1270                         {
1271                         gdouble t;
1272                         t = rx1; rx1 = rx2; rx2 = t;
1273                         t = ry1; ry1 = ry2; ry2 = t;
1274                         }
1275
1276                 slope = ry2 - ry1;
1277                 if (slope != 0.0) slope = (rx2 - rx1) / slope;
1278                 for (y = ry1; y < ry2; y += 1.0)
1279                         {
1280                         px = static_cast<gint>(rx1 + (y - ry1) * slope + 0.5);
1281                         py = static_cast<gint>(y + 0.5);
1282
1283                         if (px >=  cx1 && px < cx2 && py >= cy1 && py < cy2)
1284                                 {
1285                                 pp = p_pix + py * prs + px * p_step;
1286                                 *pp = (r * a + *pp * (256-a)) >> 8;
1287                                 pp++;
1288                                 *pp = (g * a + *pp * (256-a)) >> 8;
1289                                 pp++;
1290                                 *pp = (b * a + *pp * (256-a)) >> 8;
1291                                 }
1292                         }
1293                 }
1294 }
1295
1296 /*
1297  *-----------------------------------------------------------------------------
1298  * pixbuf drawing (fades and shadows)
1299  *-----------------------------------------------------------------------------
1300  */
1301
1302 static void pixbuf_draw_fade_linear(guchar *p_pix, gint prs, gboolean has_alpha,
1303                                     gint s, gboolean vertical, gint border,
1304                                     gint x1, gint y1, gint x2, gint y2,
1305                                     guint8 r, guint8 g, guint8 b, guint8 a)
1306 {
1307         guchar *pp;
1308         gint p_step;
1309         guint8 n = a;
1310         gint i, j;
1311
1312         p_step = (has_alpha) ? 4 : 3;
1313         for (j = y1; j < y2; j++)
1314                 {
1315                 pp = p_pix + j * prs + x1 * p_step;
1316                 if (!vertical) n = a - a * abs(j - s) / border;
1317                 for (i = x1; i < x2; i++)
1318                         {
1319                         if (vertical) n = a - a * abs(i - s) / border;
1320                         *pp = (r * n + *pp * (256-n)) >> 8;
1321                         pp++;
1322                         *pp = (g * n + *pp * (256-n)) >> 8;
1323                         pp++;
1324                         *pp = (b * n + *pp * (256-n)) >> 8;
1325                         pp++;
1326                         if (has_alpha) pp++;
1327                         }
1328                 }
1329 }
1330
1331 static void pixbuf_draw_fade_radius(guchar *p_pix, gint prs, gboolean has_alpha,
1332                                     gint sx, gint sy, gint border,
1333                                     gint x1, gint y1, gint x2, gint y2,
1334                                     guint8, guint8 g, guint8 b, guint8 a)
1335 {
1336         guchar *pp;
1337         gint p_step;
1338         gint i, j;
1339
1340         p_step = (has_alpha) ? 4 : 3;
1341         for (j = y1; j < y2; j++)
1342                 {
1343                 pp = p_pix + j * prs + x1 * p_step;
1344                 for (i = x1; i < x2; i++)
1345                         {
1346                         guint8 n;
1347                         gint r;
1348
1349                         r = MIN(border, (gint)hypot(i - sx, j - sy));
1350                         n = a - a * r / border;
1351                         *pp = (r * n + *pp * (256-n)) >> 8;
1352                         pp++;
1353                         *pp = (g * n + *pp * (256-n)) >> 8;
1354                         pp++;
1355                         *pp = (b * n + *pp * (256-n)) >> 8;
1356                         pp++;
1357                         if (has_alpha) pp++;
1358                         }
1359                 }
1360 }
1361
1362 void pixbuf_draw_shadow(GdkPixbuf *pb,
1363                         gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1364                         gint x, gint y, gint w, gint h, gint border,
1365                         guint8 r, guint8 g, guint8 b, guint8 a)
1366 {
1367         gint has_alpha;
1368         gint pw, ph, prs;
1369         gint rx, ry, rw, rh;
1370         gint fx, fy, fw, fh;
1371         guchar *p_pix;
1372
1373         if (!pb) return;
1374
1375         pw = gdk_pixbuf_get_width(pb);
1376         ph = gdk_pixbuf_get_height(pb);
1377
1378         if (!util_clip_region(0, 0, pw, ph,
1379                               clip_x, clip_y, clip_w, clip_h,
1380                               &rx, &ry, &rw, &rh)) return;
1381
1382         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1383         prs = gdk_pixbuf_get_rowstride(pb);
1384         p_pix = gdk_pixbuf_get_pixels(pb);
1385
1386         if (util_clip_region(x + border, y + border, w - border * 2, h - border * 2,
1387                              rx, ry, rw, rh,
1388                              &fx, &fy, &fw, &fh))
1389                 {
1390                 pixbuf_draw_rect_fill(pb, fx, fy, fw, fh, r, g, b, a);
1391                 }
1392
1393         if (border < 1) return;
1394
1395         if (util_clip_region(x, y + border, border, h - border * 2,
1396                              rx, ry, rw, rh,
1397                              &fx, &fy, &fw, &fh))
1398                 {
1399                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1400                                         x + border, TRUE, border,
1401                                         fx, fy, fx + fw, fy + fh,
1402                                         r, g, b, a);
1403                 }
1404         if (util_clip_region(x + w - border, y + border, border, h - border * 2,
1405                              rx, ry, rw, rh,
1406                              &fx, &fy, &fw, &fh))
1407                 {
1408                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1409                                         x + w - border, TRUE, border,
1410                                         fx, fy, fx + fw, fy + fh,
1411                                         r, g, b, a);
1412                 }
1413         if (util_clip_region(x + border, y, w - border * 2, border,
1414                              rx, ry, rw, rh,
1415                              &fx, &fy, &fw, &fh))
1416                 {
1417                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1418                                         y + border, FALSE, border,
1419                                         fx, fy, fx + fw, fy + fh,
1420                                         r, g, b, a);
1421                 }
1422         if (util_clip_region(x + border, y + h - border, w - border * 2, border,
1423                              rx, ry, rw, rh,
1424                              &fx, &fy, &fw, &fh))
1425                 {
1426                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1427                                         y + h - border, FALSE, border,
1428                                         fx, fy, fx + fw, fy + fh,
1429                                         r, g, b, a);
1430                 }
1431         if (util_clip_region(x, y, border, border,
1432                              rx, ry, rw, rh,
1433                              &fx, &fy, &fw, &fh))
1434                 {
1435                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1436                                         x + border, y + border, border,
1437                                         fx, fy, fx + fw, fy + fh,
1438                                         r, g, b, a);
1439                 }
1440         if (util_clip_region(x + w - border, y, border, border,
1441                              rx, ry, rw, rh,
1442                              &fx, &fy, &fw, &fh))
1443                 {
1444                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1445                                         x + w - border, y + border, border,
1446                                         fx, fy, fx + fw, fy + fh,
1447                                         r, g, b, a);
1448                 }
1449         if (util_clip_region(x, y + h - border, border, border,
1450                              rx, ry, rw, rh,
1451                              &fx, &fy, &fw, &fh))
1452                 {
1453                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1454                                         x + border, y + h - border, border,
1455                                         fx, fy, fx + fw, fy + fh,
1456                                         r, g, b, a);
1457                 }
1458         if (util_clip_region(x + w - border, y + h - border, border, border,
1459                              rx, ry, rw, rh,
1460                              &fx, &fy, &fw, &fh))
1461                 {
1462                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1463                                         x + w - border, y + h - border, border,
1464                                         fx, fy, fx + fw, fy + fh,
1465                                         r, g, b, a);
1466                 }
1467 }
1468
1469
1470 /*
1471  *-----------------------------------------------------------------------------
1472  * pixbuf color alterations
1473  *-----------------------------------------------------------------------------
1474  */
1475
1476 void pixbuf_desaturate_rect(GdkPixbuf *pb,
1477                             gint x, gint y, gint w, gint h)
1478 {
1479         gboolean has_alpha;
1480         gint pw, ph, prs;
1481         guchar *p_pix;
1482         guchar *pp;
1483         gint i, j;
1484
1485         if (!pb) return;
1486
1487         pw = gdk_pixbuf_get_width(pb);
1488         ph = gdk_pixbuf_get_height(pb);
1489
1490         if (x < 0 || x + w > pw) return;
1491         if (y < 0 || y + h > ph) return;
1492
1493         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1494         prs = gdk_pixbuf_get_rowstride(pb);
1495         p_pix = gdk_pixbuf_get_pixels(pb);
1496
1497         for (i = 0; i < h; i++)
1498                 {
1499                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
1500                 for (j = 0; j < w; j++)
1501                         {
1502                         guint8 grey;
1503
1504                         grey = (pp[0] + pp[1] + pp[2]) / 3;
1505                         *pp = grey;
1506                         pp++;
1507                         *pp = grey;
1508                         pp++;
1509                         *pp = grey;
1510                         pp++;
1511                         if (has_alpha) pp++;
1512                         }
1513                 }
1514 }
1515
1516 /*
1517  *-----------------------------------------------------------------------------
1518  * pixbuf highlight under/over exposure *-----------------------------------------------------------------------------
1519  */
1520 void pixbuf_highlight_overunderexposed(GdkPixbuf *pb, gint x, gint y, gint w, gint h)
1521 {
1522         gboolean has_alpha;
1523         gint pw, ph, prs;
1524         guchar *p_pix;
1525         guchar *pp;
1526         gint i, j;
1527
1528         if (!pb) return;
1529
1530         pw = gdk_pixbuf_get_width(pb);
1531         ph = gdk_pixbuf_get_height(pb);
1532
1533         if (x < 0 || x + w > pw) return;
1534         if (y < 0 || y + h > ph) return;
1535
1536         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1537         prs = gdk_pixbuf_get_rowstride(pb);
1538         p_pix = gdk_pixbuf_get_pixels(pb);
1539
1540         for (i = 0; i < h; i++)
1541                 {
1542                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
1543                 for (j = 0; j < w; j++)
1544                         {
1545                         if (pp[0] == 255 || pp[1] == 255 || pp[2] == 255 || pp[0] == 0 || pp[1] == 0 || pp[2] == 0)
1546                                 {
1547                                 *pp = 255;
1548                                 pp++;
1549                                 *pp = 0;
1550                                 pp++;
1551                                 *pp = 0;
1552                                 pp++;
1553                                 if (has_alpha) pp++;
1554                                 }
1555                         else
1556                                 {
1557                                 pp = pp + 3;
1558                                 if (has_alpha) pp++;
1559                                 }
1560                         }
1561                 }
1562 }
1563
1564 /*
1565  *-----------------------------------------------------------------------------
1566  * pixbuf ignore alpha
1567  *-----------------------------------------------------------------------------
1568 */
1569 void pixbuf_ignore_alpha_rect(GdkPixbuf *pb,
1570                  gint x, gint y, gint w, gint h)
1571 {
1572    gboolean has_alpha;
1573    gint pw, ph, prs;
1574    guchar *p_pix;
1575    guchar *pp;
1576    gint i, j;
1577
1578    if (!pb) return;
1579
1580    pw = gdk_pixbuf_get_width(pb);
1581    ph = gdk_pixbuf_get_height(pb);
1582
1583    if (x < 0 || x + w > pw) return;
1584    if (y < 0 || y + h > ph) return;
1585
1586    has_alpha = gdk_pixbuf_get_has_alpha(pb);
1587    if (!has_alpha) return;
1588
1589    prs = gdk_pixbuf_get_rowstride(pb);
1590    p_pix = gdk_pixbuf_get_pixels(pb);
1591
1592    for (i = 0; i < h; i++)
1593        {
1594        pp = p_pix + (y + i) * prs + (x * 4 );
1595        for (j = 0; j < w; j++)
1596            {
1597            pp[3] = 0xff;
1598            pp+=4;
1599            }
1600        }
1601 }
1602 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */