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;
 361                         gint nh;
 362
 363                         if (pixbuf_scale_aspect(requested_width, requested_height,
 364                                                           w, h, &nw, &nh))
 365                                 {
 366                                 GdkPixbuf *tmp;
 367
 368                                 tmp = pixbuf;
 369                                 pixbuf = gdk_pixbuf_scale_simple(tmp, nw, nh, GDK_INTERP_TILES);
 370                                 g_object_unref(G_OBJECT(tmp));
 371                                 }
 372                         }
 373                 }
 374         return pixbuf;
 375 }
 376
 377
 378 /*
 379  *-----------------------------------------------------------------------------
 380  * misc utils
 381  *-----------------------------------------------------------------------------
 382  */
 383
 384 gboolean util_clip_region(gint x, gint y, gint w, gint h,
 385                           gint clip_x, gint clip_y, gint clip_w, gint clip_h,
 386                           gint *rx, gint *ry, gint *rw, gint *rh)
 387 {
 388         if (clip_x + clip_w <= x ||
 389             clip_x >= x + w ||
 390             clip_y + clip_h <= y ||
 391             clip_y >= y + h)
 392                 {
 393                 return FALSE;
 394                 }
 395
 396         *rx = MAX(x, clip_x);
 397         *rw = MIN((x + w), (clip_x + clip_w)) - *rx;
 398
 399         *ry = MAX(y, clip_y);
 400         *rh = MIN((y + h), (clip_y + clip_h)) - *ry;
 401
 402         return TRUE;
 403 }
 404
 405 /*
 406  *-----------------------------------------------------------------------------
 407  * pixbuf rotation
 408  *-----------------------------------------------------------------------------
 409  */
 410
 411 static void pixbuf_copy_block_rotate(guchar *src, gint src_row_stride, gint x, gint y,
 412                                      guchar *dest, gint dest_row_stride, gint w, gint h,
 413                                      gint bytes_per_pixel, gboolean counter_clockwise)
 414 {
 415         gint i;
 416         gint j;
 417         guchar *sp;
 418         guchar *dp;
 419
 420         for (i = 0; i < h; i++)
 421                 {
 422                 sp = src + ((i + y) * src_row_stride) + (x * bytes_per_pixel);
 423                 for (j = 0; j < w; j++)
 424                         {
 425                         if (counter_clockwise)
 426                                 {
 427                                 dp = dest + ((w - j - 1) * dest_row_stride) + (i * bytes_per_pixel);
 428                                 }
 429                         else
 430                                 {
 431                                 dp = dest + (j * dest_row_stride) + ((h - i - 1) * bytes_per_pixel);
 432                                 }
 433                         *(dp++) = *(sp++);      /* r */
 434                         *(dp++) = *(sp++);      /* g */
 435                         *(dp++) = *(sp++);      /* b */
 436                         if (bytes_per_pixel == 4) *(dp) = *(sp++);      /* a */
 437                         }
 438                 }
 439
 440 }
 441
 442 static void pixbuf_copy_block(guchar *src, gint src_row_stride, gint w, gint h,
 443                               guchar *dest, gint dest_row_stride, gint x, gint y, gint bytes_per_pixel)
 444 {
 445         gint i;
 446         guchar *sp;
 447         guchar *dp;
 448
 449         for (i = 0; i < h; i++)
 450                 {
 451                 sp = src + (i * src_row_stride);
 452                 dp = dest + ((y + i) * dest_row_stride) + (x * bytes_per_pixel);
 453                 memcpy(dp, sp, w * bytes_per_pixel);
 454                 }
 455 }
 456
 457 enum {
 458         ROTATE_BUFFER_WIDTH = 48,
 459         ROTATE_BUFFER_HEIGHT = 48
 460 };
 461
 462 /*
 463  * Returns a copy of pixbuf src rotated 90 degrees clockwise or 90 counterclockwise
 464  *
 465  */
 466 GdkPixbuf *pixbuf_copy_rotate_90(GdkPixbuf *src, gboolean counter_clockwise)
 467 {
 468         GdkPixbuf *dest;
 469         gboolean has_alpha;
 470         gint sw;
 471         gint sh;
 472         gint srs;
 473         gint dw;
 474         gint dh;
 475         gint drs;
 476         guchar *s_pix;
 477         guchar *d_pix;
 478         gint i;
 479         gint j;
 480         gint a;
 481         GdkPixbuf *buffer;
 482         guchar *b_pix;
 483         gint brs;
 484         gint w;
 485         gint h;
 486
 487         if (!src) return nullptr;
 488
 489         sw = gdk_pixbuf_get_width(src);
 490         sh = gdk_pixbuf_get_height(src);
 491         has_alpha = gdk_pixbuf_get_has_alpha(src);
 492         srs = gdk_pixbuf_get_rowstride(src);
 493         s_pix = gdk_pixbuf_get_pixels(src);
 494
 495         dw = sh;
 496         dh = sw;
 497         dest = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8, dw, dh);
 498         drs = gdk_pixbuf_get_rowstride(dest);
 499         d_pix = gdk_pixbuf_get_pixels(dest);
 500
 501         a = (has_alpha ? 4 : 3);
 502
 503         buffer = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8,
 504                                 ROTATE_BUFFER_WIDTH, ROTATE_BUFFER_HEIGHT);
 505         b_pix = gdk_pixbuf_get_pixels(buffer);
 506         brs = gdk_pixbuf_get_rowstride(buffer);
 507
 508         for (i = 0; i < sh; i+= ROTATE_BUFFER_WIDTH)
 509                 {
 510                 w = MIN(ROTATE_BUFFER_WIDTH, (sh - i));
 511                 for (j = 0; j < sw; j += ROTATE_BUFFER_HEIGHT)
 512                         {
 513                         gint x;
 514                         gint y;
 515
 516                         h = MIN(ROTATE_BUFFER_HEIGHT, (sw - j));
 517                         pixbuf_copy_block_rotate(s_pix, srs, j, i,
 518                                                  b_pix, brs, h, w,
 519                                                  a, counter_clockwise);
 520
 521                         if (counter_clockwise)
 522                                 {
 523                                 x = i;
 524                                 y = sw - h - j;
 525                                 }
 526                         else
 527                                 {
 528                                 x = sh - w - i;
 529                                 y = j;
 530                                 }
 531                         pixbuf_copy_block(b_pix, brs, w, h,
 532                                           d_pix, drs, x, y, a);
 533                         }
 534                 }
 535
 536         g_object_unref(buffer);
 537
 538 #if 0
 539         /* this is the simple version of rotation (roughly 2-4x slower) */
 540
 541         for (i = 0; i < sh; i++)
 542                 {
 543                 sp = s_pix + (i * srs);
 544                 for (j = 0; j < sw; j++)
 545                         {
 546                         if (counter_clockwise)
 547                                 {
 548                                 dp = d_pix + ((dh - j - 1) * drs) + (i * a);
 549                                 }
 550                         else
 551                                 {
 552                                 dp = d_pix + (j * drs) + ((dw - i - 1) * a);
 553                                 }
 554
 555                         *(dp++) = *(sp++);      /* r */
 556                         *(dp++) = *(sp++);      /* g */
 557                         *(dp++) = *(sp++);      /* b */
 558                         if (has_alpha) *(dp) = *(sp++); /* a */
 559                         }
 560                 }
 561 #endif
 562
 563         return dest;
 564 }
 565
 566 /*
 567  * Returns a copy of pixbuf mirrored and or flipped.
 568  * TO do a 180 degree rotations set both mirror and flipped TRUE
 569  * if mirror and flip are FALSE, result is a simple copy.
 570  */
 571 GdkPixbuf *pixbuf_copy_mirror(GdkPixbuf *src, gboolean mirror, gboolean flip)
 572 {
 573         GdkPixbuf *dest;
 574         gboolean has_alpha;
 575         gint w;
 576         gint h;
 577         gint srs;
 578         gint drs;
 579         guchar *s_pix;
 580         guchar *d_pix;
 581         guchar *sp;
 582         guchar *dp;
 583         gint i;
 584         gint j;
 585         gint a;
 586
 587         if (!src) return nullptr;
 588
 589         w = gdk_pixbuf_get_width(src);
 590         h = gdk_pixbuf_get_height(src);
 591         has_alpha = gdk_pixbuf_get_has_alpha(src);
 592         srs = gdk_pixbuf_get_rowstride(src);
 593         s_pix = gdk_pixbuf_get_pixels(src);
 594
 595         dest = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8, w, h);
 596         drs = gdk_pixbuf_get_rowstride(dest);
 597         d_pix = gdk_pixbuf_get_pixels(dest);
 598
 599         a = has_alpha ? 4 : 3;
 600
 601         for (i = 0; i < h; i++)
 602                 {
 603                 sp = s_pix + (i * srs);
 604                 if (flip)
 605                         {
 606                         dp = d_pix + ((h - i - 1) * drs);
 607                         }
 608                 else
 609                         {
 610                         dp = d_pix + (i * drs);
 611                         }
 612                 if (mirror)
 613                         {
 614                         dp += (w - 1) * a;
 615                         for (j = 0; j < w; j++)
 616                                 {
 617                                 *(dp++) = *(sp++);      /* r */
 618                                 *(dp++) = *(sp++);      /* g */
 619                                 *(dp++) = *(sp++);      /* b */
 620                                 if (has_alpha) *(dp) = *(sp++); /* a */
 621                                 dp -= (a + 3);
 622                                 }
 623                         }
 624                 else
 625                         {
 626                         for (j = 0; j < w; j++)
 627                                 {
 628                                 *(dp++) = *(sp++);      /* r */
 629                                 *(dp++) = *(sp++);      /* g */
 630                                 *(dp++) = *(sp++);      /* b */
 631                                 if (has_alpha) *(dp++) = *(sp++);       /* a */
 632                                 }
 633                         }
 634                 }
 635
 636         return dest;
 637 }
 638
 639 GdkPixbuf *pixbuf_apply_orientation(GdkPixbuf *pixbuf, gint orientation)
 640 {
 641         GdkPixbuf *dest;
 642         GdkPixbuf *tmp = nullptr;
 643
 644         switch (orientation)
 645                 {
 646                 case EXIF_ORIENTATION_TOP_LEFT:
 647                         dest = gdk_pixbuf_copy(pixbuf);
 648                         break;
 649                 case EXIF_ORIENTATION_TOP_RIGHT:
 650                         /* mirrored */
 651                         dest = pixbuf_copy_mirror(pixbuf, TRUE, FALSE);
 652                         break;
 653                 case EXIF_ORIENTATION_BOTTOM_RIGHT:
 654                         /* upside down */
 655                         dest = pixbuf_copy_mirror(pixbuf, TRUE, TRUE);
 656                         break;
 657                 case EXIF_ORIENTATION_BOTTOM_LEFT:
 658                         /* flipped */
 659                         dest = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 660                         break;
 661                 case EXIF_ORIENTATION_LEFT_TOP:
 662                         tmp = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 663                         dest = pixbuf_copy_rotate_90(tmp, FALSE);
 664                         break;
 665                 case EXIF_ORIENTATION_RIGHT_TOP:
 666                         /* rotated -90 (270) */
 667                         dest = pixbuf_copy_rotate_90(pixbuf, FALSE);
 668                         break;
 669                 case EXIF_ORIENTATION_RIGHT_BOTTOM:
 670                         tmp = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 671                         dest = pixbuf_copy_rotate_90(tmp, TRUE);
 672                         break;
 673                 case EXIF_ORIENTATION_LEFT_BOTTOM:
 674                         /* rotated 90 */
 675                         dest = pixbuf_copy_rotate_90(pixbuf, TRUE);
 676                         break;
 677                 default:
 678                         dest = gdk_pixbuf_copy(pixbuf);
 679                         break;
 680                 }
 681         if (tmp) g_object_unref(tmp);
 682         return dest;
 683
 684 }
 685
 686
 687 /*
 688  *-----------------------------------------------------------------------------
 689  * pixbuf drawing (rectangles)
 690  *-----------------------------------------------------------------------------
 691  */
 692
 693 /*
 694  * Fills region of pixbuf at x,y over w,h
 695  * with colors red (r), green (g), blue (b)
 696  * applying alpha (a), use a=255 for solid.
 697  */
 698 void pixbuf_draw_rect_fill(GdkPixbuf *pb,
 699                            gint x, gint y, gint w, gint h,
 700                            gint r, gint g, gint b, gint a)
 701 {
 702         gboolean has_alpha;
 703         gint pw;
 704         gint ph;
 705         gint prs;
 706         guchar *p_pix;
 707         guchar *pp;
 708         gint i;
 709         gint j;
 710
 711         if (!pb) return;
 712
 713         pw = gdk_pixbuf_get_width(pb);
 714         ph = gdk_pixbuf_get_height(pb);
 715
 716         if (x < 0 || x + w > pw) return;
 717         if (y < 0 || y + h > ph) return;
 718
 719         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 720         prs = gdk_pixbuf_get_rowstride(pb);
 721         p_pix = gdk_pixbuf_get_pixels(pb);
 722
 723         for (i = 0; i < h; i++)
 724                 {
 725                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
 726                 for (j = 0; j < w; j++)
 727                         {
 728                         *pp = (r * a + *pp * (256-a)) >> 8;
 729                         pp++;
 730                         *pp = (g * a + *pp * (256-a)) >> 8;
 731                         pp++;
 732                         *pp = (b * a + *pp * (256-a)) >> 8;
 733                         pp++;
 734                         if (has_alpha) pp++;
 735                         }
 736                 }
 737 }
 738
 739 #pragma GCC diagnostic push
 740 #pragma GCC diagnostic ignored "-Wunused-function"
 741 void pixbuf_draw_rect_unused(GdkPixbuf *pb,
 742                       gint x, gint y, gint w, gint h,
 743                       gint r, gint g, gint b, gint a,
 744                       gint left, gint right, gint top, gint bottom)
 745 {
 746         pixbuf_draw_rect_fill(pb, x + left, y, w - left - right, top,
 747                               r, g, b ,a);
 748         pixbuf_draw_rect_fill(pb, x + w - right, y, right, h,
 749                               r, g, b ,a);
 750         pixbuf_draw_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
 751                               r, g, b ,a);
 752         pixbuf_draw_rect_fill(pb, x, y, left, h,
 753                               r, g, b ,a);
 754 }
 755 #pragma GCC diagnostic pop
 756
 757 void pixbuf_set_rect_fill(GdkPixbuf *pb,
 758                           gint x, gint y, gint w, gint h,
 759                           gint r, gint g, gint b, gint a)
 760 {
 761         gboolean has_alpha;
 762         gint pw;
 763         gint ph;
 764         gint prs;
 765         guchar *p_pix;
 766         guchar *pp;
 767         gint i;
 768         gint j;
 769
 770         if (!pb) return;
 771
 772         pw = gdk_pixbuf_get_width(pb);
 773         ph = gdk_pixbuf_get_height(pb);
 774
 775         if (x < 0 || x + w > pw) return;
 776         if (y < 0 || y + h > ph) return;
 777
 778         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 779         prs = gdk_pixbuf_get_rowstride(pb);
 780         p_pix = gdk_pixbuf_get_pixels(pb);
 781
 782         for (i = 0; i < h; i++)
 783                 {
 784                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
 785                 for (j = 0; j < w; j++)
 786                         {
 787                         *pp = r; pp++;
 788                         *pp = g; pp++;
 789                         *pp = b; pp++;
 790                         if (has_alpha) { *pp = a; pp++; }
 791                         }
 792                 }
 793 }
 794
 795 void pixbuf_set_rect(GdkPixbuf *pb,
 796                      gint x, gint y, gint w, gint h,
 797                      gint r, gint g, gint b, gint a,
 798                      gint left, gint right, gint top, gint bottom)
 799 {
 800         pixbuf_set_rect_fill(pb, x + left, y, w - left - right, top,
 801                              r, g, b ,a);
 802         pixbuf_set_rect_fill(pb, x + w - right, y, right, h,
 803                              r, g, b ,a);
 804         pixbuf_set_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
 805                              r, g, b ,a);
 806         pixbuf_set_rect_fill(pb, x, y, left, h,
 807                              r, g, b ,a);
 808 }
 809
 810 void pixbuf_pixel_set(GdkPixbuf *pb, gint x, gint y, gint r, gint g, gint b, gint a)
 811 {
 812         guchar *buf;
 813         gboolean has_alpha;
 814         gint rowstride;
 815         guchar *p;
 816
 817         if (x < 0 || x >= gdk_pixbuf_get_width(pb) ||
 818             y < 0 || y >= gdk_pixbuf_get_height(pb)) return;
 819
 820         buf = gdk_pixbuf_get_pixels(pb);
 821         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 822         rowstride = gdk_pixbuf_get_rowstride(pb);
 823
 824         p = buf + (y * rowstride) + (x * (has_alpha ? 4 : 3));
 825         *p = r; p++;
 826         *p = g; p++;
 827         *p = b; p++;
 828         if (has_alpha) *p = a;
 829 }
 830
 831
 832 /*
 833  *-----------------------------------------------------------------------------
 834  * pixbuf text rendering
 835  *-----------------------------------------------------------------------------
 836  */
 837
 838 static void pixbuf_copy_font(GdkPixbuf *src, gint sx, gint sy,
 839                              GdkPixbuf *dest, gint dx, gint dy,
 840                              gint w, gint h,
 841                              guint8 r, guint8 g, guint8 b, guint8 a)
 842 {
 843         gint sw;
 844         gint sh;
 845         gint srs;
 846         gboolean s_alpha;
 847         gint s_step;
 848         guchar *s_pix;
 849         gint dw;
 850         gint dh;
 851         gint drs;
 852         gboolean d_alpha;
 853         gint d_step;
 854         guchar *d_pix;
 855
 856         guchar *sp;
 857         guchar *dp;
 858         gint i;
 859         gint j;
 860
 861         if (!src || !dest) return;
 862
 863         sw = gdk_pixbuf_get_width(src);
 864         sh = gdk_pixbuf_get_height(src);
 865
 866         if (sx < 0 || sx + w > sw) return;
 867         if (sy < 0 || sy + h > sh) return;
 868
 869         dw = gdk_pixbuf_get_width(dest);
 870         dh = gdk_pixbuf_get_height(dest);
 871
 872         if (dx < 0 || dx + w > dw) return;
 873         if (dy < 0 || dy + h > dh) return;
 874
 875         s_alpha = gdk_pixbuf_get_has_alpha(src);
 876         d_alpha = gdk_pixbuf_get_has_alpha(dest);
 877         srs = gdk_pixbuf_get_rowstride(src);
 878         drs = gdk_pixbuf_get_rowstride(dest);
 879         s_pix = gdk_pixbuf_get_pixels(src);
 880         d_pix = gdk_pixbuf_get_pixels(dest);
 881
 882         s_step = (s_alpha) ? 4 : 3;
 883         d_step = (d_alpha) ? 4 : 3;
 884
 885         for (i = 0; i < h; i++)
 886                 {
 887                 sp = s_pix + (sy + i) * srs + sx * s_step;
 888                 dp = d_pix + (dy + i) * drs + dx * d_step;
 889                 for (j = 0; j < w; j++)
 890                         {
 891                         if (*sp)
 892                                 {
 893                                 guint8 asub;
 894
 895                                 asub = a * sp[0] / 255;
 896                                 *dp = (r * asub + *dp * (256-asub)) >> 8;
 897                                 dp++;
 898                                 asub = a * sp[1] / 255;
 899                                 *dp = (g * asub + *dp * (256-asub)) >> 8;
 900                                 dp++;
 901                                 asub = a * sp[2] / 255;
 902                                 *dp = (b * asub + *dp * (256-asub)) >> 8;
 903                                 dp++;
 904
 905                                 if (d_alpha)
 906                                         {
 907                                         *dp = MAX(*dp, a * ((sp[0] + sp[1] + sp[2]) / 3) / 255);
 908                                         dp++;
 909                                         }
 910                                 }
 911                         else
 912                                 {
 913                                 dp += d_step;
 914                                 }
 915
 916                         sp += s_step;
 917                         }
 918                 }
 919 }
 920
 921 void pixbuf_draw_layout(GdkPixbuf *pixbuf, PangoLayout *layout, GtkWidget *,
 922                         gint x, gint y,
 923                         guint8 r, guint8 g, guint8 b, guint8 a)
 924 {
 925         GdkPixbuf *buffer;
 926         gint w;
 927         gint h;
 928         gint sx;
 929         gint sy;
 930         gint dw;
 931         gint dh;
 932         cairo_surface_t *source;
 933         cairo_t *cr;
 934
 935         pango_layout_get_pixel_size(layout, &w, &h);
 936         if (w < 1 || h < 1) return;
 937
 938         source = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
 939
 940         cr = cairo_create (source);
 941         cairo_set_source_rgb(cr, 0, 0, 0);
 942         cairo_rectangle (cr, 0, 0, w, h);
 943         cairo_fill (cr);
 944         cairo_set_source_rgb(cr, 1, 1, 1);
 945         pango_cairo_show_layout (cr, layout);
 946         cairo_destroy (cr);
 947
 948         buffer = gdk_pixbuf_new_from_data (cairo_image_surface_get_data (source),
 949                                            GDK_COLORSPACE_RGB,
 950                                            cairo_image_surface_get_format (source) == CAIRO_FORMAT_ARGB32,
 951                                            8,
 952                                            cairo_image_surface_get_width (source),
 953                                            cairo_image_surface_get_height (source),
 954                                            cairo_image_surface_get_stride (source),
 955                                            nullptr,
 956                                            nullptr);
 957
 958         sx = 0;
 959         sy = 0;
 960         dw = gdk_pixbuf_get_width(pixbuf);
 961         dh = gdk_pixbuf_get_height(pixbuf);
 962
 963         if (x < 0)
 964                 {
 965                 w += x;
 966                 sx = -x;
 967                 x = 0;
 968                 }
 969
 970         if (y < 0)
 971                 {
 972                 h += y;
 973                 sy = -y;
 974                 y = 0;
 975                 }
 976
 977         if (x + w > dw) w = dw - x;
 978         if (y + h > dh) h = dh - y;
 979
 980         pixbuf_copy_font(buffer, sx, sy,
 981                          pixbuf, x, y, w, h,
 982                          r, g, b, a);
 983
 984         g_object_unref(buffer);
 985         cairo_surface_destroy(source);
 986 }
 987
 988 /*
 989  *-----------------------------------------------------------------------------
 990  * pixbuf drawing (triangle)
 991  *-----------------------------------------------------------------------------
 992  */
 993
 994 void util_clip_triangle(gint x1, gint y1, gint x2, gint y2, gint x3, gint y3,
 995                         gint *rx, gint *ry, gint *rw, gint *rh)
 996 {
 997         gint tx;
 998         gint ty;
 999         gint tw;
1000         gint th;
1001
1002         tx = MIN(x1, x2);
1003         tx = MIN(tx, x3);
1004         ty = MIN(y1, y2);
1005         ty = MIN(ty, y3);
1006         tw = MAX(abs(x1 - x2), abs(x2 - x3));
1007         tw = MAX(tw, abs(x3 - x1));
1008         th = MAX(abs(y1 - y2), abs(y2 - y3));
1009         th = MAX(th, abs(y3 - y1));
1010
1011         *rx = tx;
1012         *ry = ty;
1013         *rw = tw;
1014         *rh = th;
1015 }
1016
1017 void pixbuf_draw_triangle(GdkPixbuf *pb,
1018                           gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1019                           gint x1, gint y1, gint x2, gint y2, gint x3, gint y3,
1020                           guint8 r, guint8 g, guint8 b, guint8 a)
1021 {
1022         gboolean has_alpha;
1023         gint pw;
1024         gint ph;
1025         gint prs;
1026         gint rx;
1027         gint ry;
1028         gint rw;
1029         gint rh;
1030         gint tx;
1031         gint ty;
1032         gint tw;
1033         gint th;
1034         gint fx1;
1035         gint fy1;
1036         gint fx2;
1037         gint fy2;
1038         gint fw;
1039         gint fh;
1040         guchar *p_pix;
1041         guchar *pp;
1042         gint p_step;
1043         gdouble slope1;
1044         gdouble slope2;
1045         gint slope1_x;
1046         gint slope1_y;
1047         gint y;
1048         gint t;
1049         gboolean middle = FALSE;
1050
1051         if (!pb) return;
1052
1053         pw = gdk_pixbuf_get_width(pb);
1054         ph = gdk_pixbuf_get_height(pb);
1055
1056         if (!util_clip_region(0, 0, pw, ph,
1057                               clip_x, clip_y, clip_w, clip_h,
1058                               &rx, &ry, &rw, &rh)) return;
1059
1060         util_clip_triangle(x1, y1, x2, y2, x3, y3,
1061                            &tx, &ty, &tw, &th);
1062
1063         if (!util_clip_region(rx, ry, rw, rh,
1064                               tx, ty, tw, th,
1065                               &fx1, &fy1, &fw, &fh)) return;
1066         fx2 = fx1 + fw;
1067         fy2 = fy1 + fh;
1068
1069         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1070         prs = gdk_pixbuf_get_rowstride(pb);
1071         p_pix = gdk_pixbuf_get_pixels(pb);
1072
1073         p_step = (has_alpha) ? 4 : 3;
1074
1075         if (y1 > y2)
1076                 {
1077                 t = x1; x1 = x2; x2 = t;
1078                 t = y1; y1 = y2; y2 = t;
1079                 }
1080         if (y2 > y3)
1081                 {
1082                 t = x2; x2 = x3; x3 = t;
1083                 t = y2; y2 = y3; y3 = t;
1084                 }
1085         if (y1 > y2)
1086                 {
1087                 t = x1; x1 = x2; x2 = t;
1088                 t = y1; y1 = y2; y2 = t;
1089                 }
1090
1091         slope1 = static_cast<gdouble>(y2 - y1);
1092         if (slope1) slope1 = static_cast<gdouble>(x2 - x1) / slope1;
1093         slope1_x = x1;
1094         slope1_y = y1;
1095         slope2 = static_cast<gdouble>(y3 - y1);
1096         if (slope2) slope2 = static_cast<gdouble>(x3 - x1) / slope2;
1097
1098         for (y = fy1; y < fy2; y++)
1099                 {
1100                 gint xa;
1101                 gint xb;
1102
1103                 if (!middle && y > y2)
1104                         {
1105                         slope1 = static_cast<gdouble>(y3 - y2);
1106                         if (slope1) slope1 = static_cast<gdouble>(x3 - x2) / slope1;
1107                         slope1_x = x2;
1108                         slope1_y = y2;
1109
1110                         middle = TRUE;
1111                         }
1112
1113                 xa = slope1_x + (slope1 * (y - slope1_y) + 0.5);
1114                 xb = x1 + (slope2 * (y - y1) + 0.5);
1115
1116                 if (xa > xb)
1117                         {
1118                         t = xa; xa = xb; xb = t;
1119                         }
1120
1121                 xa = CLAMP(xa, fx1, fx2);
1122                 xb = CLAMP(xb, fx1, fx2);
1123
1124                 pp = p_pix + y * prs + xa * p_step;
1125
1126                 while (xa < xb)
1127                         {
1128                         *pp = (r * a + *pp * (256-a)) >> 8;
1129                         pp++;
1130                         *pp = (g * a + *pp * (256-a)) >> 8;
1131                         pp++;
1132                         *pp = (b * a + *pp * (256-a)) >> 8;
1133                         pp++;
1134                         if (has_alpha) pp++;
1135
1136                         xa++;
1137                         }
1138                 }
1139 }
1140
1141 /*
1142  *-----------------------------------------------------------------------------
1143  * pixbuf drawing (line)
1144  *-----------------------------------------------------------------------------
1145  */
1146
1147 static gboolean util_clip_line(gdouble clip_x, gdouble clip_y, gdouble clip_w, gdouble clip_h,
1148                                gdouble x1, gdouble y1, gdouble x2, gdouble y2,
1149                                gdouble *rx1, gdouble *ry1, gdouble *rx2, gdouble *ry2)
1150 {
1151         gboolean flip = FALSE;
1152         gdouble d;
1153
1154         if (x1 > x2)
1155                 {
1156                 gdouble t;
1157
1158                 t = x1; x1 = x2; x2 = t;
1159                 t = y1; y1 = y2; y2 = t;
1160                 flip = TRUE;
1161                 }
1162
1163         if (x2 < clip_x || x1 > clip_x + clip_w) return FALSE;
1164
1165         if (y1 < y2)
1166                 {
1167                 if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
1168                 }
1169         else
1170                 {
1171                 if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
1172                 }
1173
1174         d = x2 - x1;
1175         if (d > 0.0)
1176                 {
1177                 gdouble slope;
1178
1179                 slope = (y2 - y1) / d;
1180                 if (x1 < clip_x)
1181                         {
1182                         y1 = y1 + slope * (clip_x - x1);
1183                         x1 = clip_x;
1184                         }
1185                 if (x2 > clip_x + clip_w)
1186                         {
1187                         y2 = y2 + slope * (clip_x + clip_w - x2);
1188                         x2 = clip_x + clip_w;
1189                         }
1190                 }
1191
1192         if (y1 < y2)
1193                 {
1194                 if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
1195                 }
1196         else
1197                 {
1198                 gdouble t;
1199
1200                 if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
1201
1202                 t = x1; x1 = x2; x2 = t;
1203                 t = y1; y1 = y2; y2 = t;
1204                 flip = !flip;
1205                 }
1206
1207         d = y2 - y1;
1208         if (d > 0.0)
1209                 {
1210                 gdouble slope;
1211
1212                 slope = (x2 - x1) / d;
1213                 if (y1 < clip_y)
1214                         {
1215                         x1 = x1 + slope * (clip_y - y1);
1216                         y1 = clip_y;
1217                         }
1218                 if (y2 > clip_y + clip_h)
1219                         {
1220                         x2 = x2 + slope * (clip_y + clip_h - y2);
1221                         y2 = clip_y + clip_h;
1222                         }
1223                 }
1224
1225         if (flip)
1226                 {
1227                 *rx1 = x2;
1228                 *ry1 = y2;
1229                 *rx2 = x1;
1230                 *ry2 = y1;
1231                 }
1232         else
1233                 {
1234                 *rx1 = x1;
1235                 *ry1 = y1;
1236                 *rx2 = x2;
1237                 *ry2 = y2;
1238                 }
1239
1240         return TRUE;
1241 }
1242
1243 void pixbuf_draw_line(GdkPixbuf *pb,
1244                       gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1245                       gint x1, gint y1, gint x2, gint y2,
1246                       guint8 r, guint8 g, guint8 b, guint8 a)
1247 {
1248         gboolean has_alpha;
1249         gint pw;
1250         gint ph;
1251         gint prs;
1252         gint rx;
1253         gint ry;
1254         gint rw;
1255         gint rh;
1256         gdouble rx1;
1257         gdouble ry1;
1258         gdouble rx2;
1259         gdouble ry2;
1260         guchar *p_pix;
1261         guchar *pp;
1262         gint p_step;
1263         gdouble slope;
1264         gdouble x;
1265         gdouble y;
1266         gint px;
1267         gint py;
1268         gint cx1;
1269         gint cy1;
1270         gint cx2;
1271         gint cy2;
1272
1273         if (!pb) return;
1274
1275         pw = gdk_pixbuf_get_width(pb);
1276         ph = gdk_pixbuf_get_height(pb);
1277
1278         if (!util_clip_region(0, 0, pw, ph,
1279                               clip_x, clip_y, clip_w, clip_h,
1280                               &rx, &ry, &rw, &rh)) return;
1281         if (!util_clip_line(static_cast<gdouble>(rx), static_cast<gdouble>(ry), static_cast<gdouble>(rw), static_cast<gdouble>(rh),
1282                             static_cast<gdouble>(x1), static_cast<gdouble>(y1), static_cast<gdouble>(x2), static_cast<gdouble>(y2),
1283                             &rx1, &ry1, &rx2, &ry2)) return;
1284
1285         cx1 = rx;
1286         cy1 = ry;
1287         cx2 = rx + rw;
1288         cy2 = ry + rh;
1289
1290         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1291         prs = gdk_pixbuf_get_rowstride(pb);
1292         p_pix = gdk_pixbuf_get_pixels(pb);
1293
1294         p_step = (has_alpha) ? 4 : 3;
1295
1296         if (fabs(rx2 - rx1) > fabs(ry2 - ry1))
1297                 {
1298                 if (rx1 > rx2)
1299                         {
1300                         gdouble t;
1301                         t = rx1; rx1 = rx2; rx2 = t;
1302                         t = ry1; ry1 = ry2; ry2 = t;
1303                         }
1304
1305                 slope = rx2 - rx1;
1306                 if (slope != 0.0) slope = (ry2 - ry1) / slope;
1307                 for (x = rx1; x < rx2; x += 1.0)
1308                         {
1309                         px = static_cast<gint>(x + 0.5);
1310                         py = static_cast<gint>(ry1 + (x - rx1) * slope + 0.5);
1311
1312                         if (px >=  cx1 && px < cx2 && py >= cy1 && py < cy2)
1313                                 {
1314                                 pp = p_pix + py * prs + px * p_step;
1315                                 *pp = (r * a + *pp * (256-a)) >> 8;
1316                                 pp++;
1317                                 *pp = (g * a + *pp * (256-a)) >> 8;
1318                                 pp++;
1319                                 *pp = (b * a + *pp * (256-a)) >> 8;
1320                                 }
1321                         }
1322                 }
1323         else
1324                 {
1325                 if (ry1 > ry2)
1326                         {
1327                         gdouble t;
1328                         t = rx1; rx1 = rx2; rx2 = t;
1329                         t = ry1; ry1 = ry2; ry2 = t;
1330                         }
1331
1332                 slope = ry2 - ry1;
1333                 if (slope != 0.0) slope = (rx2 - rx1) / slope;
1334                 for (y = ry1; y < ry2; y += 1.0)
1335                         {
1336                         px = static_cast<gint>(rx1 + (y - ry1) * slope + 0.5);
1337                         py = static_cast<gint>(y + 0.5);
1338
1339                         if (px >=  cx1 && px < cx2 && py >= cy1 && py < cy2)
1340                                 {
1341                                 pp = p_pix + py * prs + px * p_step;
1342                                 *pp = (r * a + *pp * (256-a)) >> 8;
1343                                 pp++;
1344                                 *pp = (g * a + *pp * (256-a)) >> 8;
1345                                 pp++;
1346                                 *pp = (b * a + *pp * (256-a)) >> 8;
1347                                 }
1348                         }
1349                 }
1350 }
1351
1352 /*
1353  *-----------------------------------------------------------------------------
1354  * pixbuf drawing (fades and shadows)
1355  *-----------------------------------------------------------------------------
1356  */
1357
1358 static void pixbuf_draw_fade_linear(guchar *p_pix, gint prs, gboolean has_alpha,
1359                                     gint s, gboolean vertical, gint border,
1360                                     gint x1, gint y1, gint x2, gint y2,
1361                                     guint8 r, guint8 g, guint8 b, guint8 a)
1362 {
1363         guchar *pp;
1364         gint p_step;
1365         guint8 n = a;
1366         gint i;
1367         gint j;
1368
1369         p_step = (has_alpha) ? 4 : 3;
1370         for (j = y1; j < y2; j++)
1371                 {
1372                 pp = p_pix + j * prs + x1 * p_step;
1373                 if (!vertical) n = a - a * abs(j - s) / border;
1374                 for (i = x1; i < x2; i++)
1375                         {
1376                         if (vertical) n = a - a * abs(i - s) / border;
1377                         *pp = (r * n + *pp * (256-n)) >> 8;
1378                         pp++;
1379                         *pp = (g * n + *pp * (256-n)) >> 8;
1380                         pp++;
1381                         *pp = (b * n + *pp * (256-n)) >> 8;
1382                         pp++;
1383                         if (has_alpha) pp++;
1384                         }
1385                 }
1386 }
1387
1388 static void pixbuf_draw_fade_radius(guchar *p_pix, gint prs, gboolean has_alpha,
1389                                     gint sx, gint sy, gint border,
1390                                     gint x1, gint y1, gint x2, gint y2,
1391                                     guint8, guint8 g, guint8 b, guint8 a)
1392 {
1393         guchar *pp;
1394         gint p_step;
1395         gint i;
1396         gint j;
1397
1398         p_step = (has_alpha) ? 4 : 3;
1399         for (j = y1; j < y2; j++)
1400                 {
1401                 pp = p_pix + j * prs + x1 * p_step;
1402                 for (i = x1; i < x2; i++)
1403                         {
1404                         guint8 n;
1405                         gint r;
1406
1407                         r = MIN(border, (gint)hypot(i - sx, j - sy));
1408                         n = a - a * r / border;
1409                         *pp = (r * n + *pp * (256-n)) >> 8;
1410                         pp++;
1411                         *pp = (g * n + *pp * (256-n)) >> 8;
1412                         pp++;
1413                         *pp = (b * n + *pp * (256-n)) >> 8;
1414                         pp++;
1415                         if (has_alpha) pp++;
1416                         }
1417                 }
1418 }
1419
1420 void pixbuf_draw_shadow(GdkPixbuf *pb,
1421                         gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1422                         gint x, gint y, gint w, gint h, gint border,
1423                         guint8 r, guint8 g, guint8 b, guint8 a)
1424 {
1425         gint has_alpha;
1426         gint pw;
1427         gint ph;
1428         gint prs;
1429         gint rx;
1430         gint ry;
1431         gint rw;
1432         gint rh;
1433         gint fx;
1434         gint fy;
1435         gint fw;
1436         gint fh;
1437         guchar *p_pix;
1438
1439         if (!pb) return;
1440
1441         pw = gdk_pixbuf_get_width(pb);
1442         ph = gdk_pixbuf_get_height(pb);
1443
1444         if (!util_clip_region(0, 0, pw, ph,
1445                               clip_x, clip_y, clip_w, clip_h,
1446                               &rx, &ry, &rw, &rh)) return;
1447
1448         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1449         prs = gdk_pixbuf_get_rowstride(pb);
1450         p_pix = gdk_pixbuf_get_pixels(pb);
1451
1452         if (util_clip_region(x + border, y + border, w - border * 2, h - border * 2,
1453                              rx, ry, rw, rh,
1454                              &fx, &fy, &fw, &fh))
1455                 {
1456                 pixbuf_draw_rect_fill(pb, fx, fy, fw, fh, r, g, b, a);
1457                 }
1458
1459         if (border < 1) return;
1460
1461         if (util_clip_region(x, y + border, border, h - border * 2,
1462                              rx, ry, rw, rh,
1463                              &fx, &fy, &fw, &fh))
1464                 {
1465                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1466                                         x + border, TRUE, border,
1467                                         fx, fy, fx + fw, fy + fh,
1468                                         r, g, b, a);
1469                 }
1470         if (util_clip_region(x + w - border, y + border, border, h - border * 2,
1471                              rx, ry, rw, rh,
1472                              &fx, &fy, &fw, &fh))
1473                 {
1474                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1475                                         x + w - border, TRUE, border,
1476                                         fx, fy, fx + fw, fy + fh,
1477                                         r, g, b, a);
1478                 }
1479         if (util_clip_region(x + border, y, w - border * 2, border,
1480                              rx, ry, rw, rh,
1481                              &fx, &fy, &fw, &fh))
1482                 {
1483                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1484                                         y + border, FALSE, border,
1485                                         fx, fy, fx + fw, fy + fh,
1486                                         r, g, b, a);
1487                 }
1488         if (util_clip_region(x + border, y + h - border, w - border * 2, border,
1489                              rx, ry, rw, rh,
1490                              &fx, &fy, &fw, &fh))
1491                 {
1492                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1493                                         y + h - border, FALSE, border,
1494                                         fx, fy, fx + fw, fy + fh,
1495                                         r, g, b, a);
1496                 }
1497         if (util_clip_region(x, y, border, border,
1498                              rx, ry, rw, rh,
1499                              &fx, &fy, &fw, &fh))
1500                 {
1501                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1502                                         x + border, y + border, border,
1503                                         fx, fy, fx + fw, fy + fh,
1504                                         r, g, b, a);
1505                 }
1506         if (util_clip_region(x + w - border, y, border, border,
1507                              rx, ry, rw, rh,
1508                              &fx, &fy, &fw, &fh))
1509                 {
1510                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1511                                         x + w - border, y + border, border,
1512                                         fx, fy, fx + fw, fy + fh,
1513                                         r, g, b, a);
1514                 }
1515         if (util_clip_region(x, y + h - border, border, border,
1516                              rx, ry, rw, rh,
1517                              &fx, &fy, &fw, &fh))
1518                 {
1519                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1520                                         x + border, y + h - border, border,
1521                                         fx, fy, fx + fw, fy + fh,
1522                                         r, g, b, a);
1523                 }
1524         if (util_clip_region(x + w - border, y + h - border, border, border,
1525                              rx, ry, rw, rh,
1526                              &fx, &fy, &fw, &fh))
1527                 {
1528                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1529                                         x + w - border, y + h - border, border,
1530                                         fx, fy, fx + fw, fy + fh,
1531                                         r, g, b, a);
1532                 }
1533 }
1534
1535
1536 /*
1537  *-----------------------------------------------------------------------------
1538  * pixbuf color alterations
1539  *-----------------------------------------------------------------------------
1540  */
1541
1542 void pixbuf_desaturate_rect(GdkPixbuf *pb,
1543                             gint x, gint y, gint w, gint h)
1544 {
1545         gboolean has_alpha;
1546         gint pw;
1547         gint ph;
1548         gint prs;
1549         guchar *p_pix;
1550         guchar *pp;
1551         gint i;
1552         gint j;
1553
1554         if (!pb) return;
1555
1556         pw = gdk_pixbuf_get_width(pb);
1557         ph = gdk_pixbuf_get_height(pb);
1558
1559         if (x < 0 || x + w > pw) return;
1560         if (y < 0 || y + h > ph) return;
1561
1562         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1563         prs = gdk_pixbuf_get_rowstride(pb);
1564         p_pix = gdk_pixbuf_get_pixels(pb);
1565
1566         for (i = 0; i < h; i++)
1567                 {
1568                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
1569                 for (j = 0; j < w; j++)
1570                         {
1571                         guint8 grey;
1572
1573                         grey = (pp[0] + pp[1] + pp[2]) / 3;
1574                         *pp = grey;
1575                         pp++;
1576                         *pp = grey;
1577                         pp++;
1578                         *pp = grey;
1579                         pp++;
1580                         if (has_alpha) pp++;
1581                         }
1582                 }
1583 }
1584
1585 /*
1586  *-----------------------------------------------------------------------------
1587  * pixbuf highlight under/over exposure *-----------------------------------------------------------------------------
1588  */
1589 void pixbuf_highlight_overunderexposed(GdkPixbuf *pb, gint x, gint y, gint w, gint h)
1590 {
1591         gboolean has_alpha;
1592         gint pw;
1593         gint ph;
1594         gint prs;
1595         guchar *p_pix;
1596         guchar *pp;
1597         gint i;
1598         gint j;
1599
1600         if (!pb) return;
1601
1602         pw = gdk_pixbuf_get_width(pb);
1603         ph = gdk_pixbuf_get_height(pb);
1604
1605         if (x < 0 || x + w > pw) return;
1606         if (y < 0 || y + h > ph) return;
1607
1608         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1609         prs = gdk_pixbuf_get_rowstride(pb);
1610         p_pix = gdk_pixbuf_get_pixels(pb);
1611
1612         for (i = 0; i < h; i++)
1613                 {
1614                 pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
1615                 for (j = 0; j < w; j++)
1616                         {
1617                         if (pp[0] == 255 || pp[1] == 255 || pp[2] == 255 || pp[0] == 0 || pp[1] == 0 || pp[2] == 0)
1618                                 {
1619                                 *pp = 255;
1620                                 pp++;
1621                                 *pp = 0;
1622                                 pp++;
1623                                 *pp = 0;
1624                                 pp++;
1625                                 if (has_alpha) pp++;
1626                                 }
1627                         else
1628                                 {
1629                                 pp = pp + 3;
1630                                 if (has_alpha) pp++;
1631                                 }
1632                         }
1633                 }
1634 }
1635
1636 /*
1637  *-----------------------------------------------------------------------------
1638  * pixbuf ignore alpha
1639  *-----------------------------------------------------------------------------
1640 */
1641 void pixbuf_ignore_alpha_rect(GdkPixbuf *pb,
1642                  gint x, gint y, gint w, gint h)
1643 {
1644    gboolean has_alpha;
1645    gint pw;
1646    gint ph;
1647    gint prs;
1648    guchar *p_pix;
1649    guchar *pp;
1650    gint i;
1651    gint j;
1652
1653    if (!pb) return;
1654
1655    pw = gdk_pixbuf_get_width(pb);
1656    ph = gdk_pixbuf_get_height(pb);
1657
1658    if (x < 0 || x + w > pw) return;
1659    if (y < 0 || y + h > ph) return;
1660
1661    has_alpha = gdk_pixbuf_get_has_alpha(pb);
1662    if (!has_alpha) return;
1663
1664    prs = gdk_pixbuf_get_rowstride(pb);
1665    p_pix = gdk_pixbuf_get_pixels(pb);
1666
1667    for (i = 0; i < h; i++)
1668        {
1669        pp = p_pix + (y + i) * prs + (x * 4 );
1670        for (j = 0; j < w; j++)
1671            {
1672            pp[3] = 0xff;
1673            pp+=4;
1674            }
1675        }
1676 }
1677 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */