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 "pixbuf-util.h"
  23
  24 #include <algorithm>
  25 #include <cmath>
  26 #include <cstdlib>
  27 #include <cstring>
  28 #include <utility>
  29
  30 #include <cairo.h>
  31 #include <gio/gio.h>
  32 #include <glib-object.h>
  33 #include <pango/pangocairo.h>
  34
  35 #include <config.h>
  36
  37 #include "debug.h"
  38 #include "exif.h"
  39 #include "filedata.h"
  40 #include "main-defines.h"
  41 #include "typedefs.h"
  42 #include "ui-fileops.h"
  43
  44
  45 /*
  46  *-----------------------------------------------------------------------------
  47  * png save
  48  *-----------------------------------------------------------------------------
  49  */
  50
  51 gboolean pixbuf_to_file_as_png(GdkPixbuf *pixbuf, const gchar *filename)
  52 {
  53         GError *error = nullptr;
  54         gboolean ret;
  55
  56         if (!pixbuf || !filename) return FALSE;
  57
  58         ret = gdk_pixbuf_save(pixbuf, filename, "png", &error,
  59                               "tEXt::Software", GQ_APPNAME " " VERSION, NULL);
  60
  61         if (error)
  62                 {
  63                 log_printf("Error saving png file: %s\n", error->message);
  64                 g_error_free(error);
  65                 }
  66
  67         return ret;
  68 }
  69
  70 /*
  71  *-----------------------------------------------------------------------------
  72  * jpeg save
  73  *-----------------------------------------------------------------------------
  74  */
  75
  76 #pragma GCC diagnostic push
  77 #pragma GCC diagnostic ignored "-Wunused-function"
  78 gboolean pixbuf_to_file_as_jpg_unused(GdkPixbuf *pixbuf, const gchar *filename, gint quality)
  79 {
  80         GError *error = nullptr;
  81         gchar *qbuf;
  82         gboolean ret;
  83
  84         if (!pixbuf || !filename) return FALSE;
  85
  86         if (quality == -1) quality = 75;
  87         if (quality < 1 || quality > 100)
  88                 {
  89                 log_printf("Jpeg not saved, invalid quality %d\n", quality);
  90                 return FALSE;
  91                 }
  92
  93         qbuf = g_strdup_printf("%d", quality);
  94         ret = gdk_pixbuf_save(pixbuf, filename, "jpeg", &error, "quality", qbuf, NULL);
  95         g_free(qbuf);
  96
  97         if (error)
  98                 {
  99                 log_printf("Error saving jpeg to %s\n%s\n", filename, error->message);
 100                 g_error_free(error);
 101                 }
 102
 103         return ret;
 104 }
 105 #pragma GCC diagnostic pop
 106
 107 /*
 108  *-----------------------------------------------------------------------------
 109  * pixbuf from inline
 110  *-----------------------------------------------------------------------------
 111  */
 112
 113 struct PixbufInline
 114 {
 115         const gchar *key;
 116         const gchar *data;
 117 };
 118
 119 static PixbufInline inline_pixbuf_data[] = {
 120         {  PIXBUF_INLINE_ARCHIVE,                "gq-icon-archive-file" },
 121         {  PIXBUF_INLINE_BROKEN,                 "gq-icon-broken" },
 122         {  PIXBUF_INLINE_COLLECTION,             "gq-icon-collection" },
 123         {  PIXBUF_INLINE_ICON_180,               "gq-icon-rotate-180" },
 124         {  PIXBUF_INLINE_ICON_BOOK,              "gq-icon-book" },
 125         {  PIXBUF_INLINE_ICON_CONFIG,            "gq-icon-config" },
 126         {  PIXBUF_INLINE_ICON_DRAW_RECTANGLE,    "gq-icon-draw-rectangle" },
 127         {  PIXBUF_INLINE_ICON_EXIF,              "gq-icon-exif" },
 128         {  PIXBUF_INLINE_ICON_EXPOSURE,          "gq-icon-exposure" },
 129         {  PIXBUF_INLINE_ICON_FLOAT,             "gq-icon-float" },
 130         {  PIXBUF_INLINE_ICON,                   "gqview-icon" },
 131         {  PIXBUF_INLINE_ICON_GRAYSCALE,         "gq-icon-grayscale" },
 132         {  PIXBUF_INLINE_ICON_HEIF,              "gq-icon-heic" },
 133         {  PIXBUF_INLINE_ICON_HIDETOOLS,         "gq-icon-hidetools" },
 134         {  PIXBUF_INLINE_ICON_MAINTENANCE,       "gq-icon-maintenance" },
 135         {  PIXBUF_INLINE_ICON_MARKS,             "gq-icon-marks" },
 136         {  PIXBUF_INLINE_ICON_MOVE,              "gq-icon-move" },
 137         {  PIXBUF_INLINE_ICON_ORIGINAL,          "gq-icon-original" },
 138         {  PIXBUF_INLINE_ICON_PANORAMA,          "gq-icon-panorama" },
 139         {  PIXBUF_INLINE_ICON_PDF,               "gq-icon-pdf" },
 140         {  PIXBUF_INLINE_ICON_PROPERTIES,        "gq-icon-properties" },
 141         {  PIXBUF_INLINE_ICON_RENAME,            "gq-icon-rename" },
 142         {  PIXBUF_INLINE_ICON_SELECT_ALL,        "gq-icon-select-all" },
 143         {  PIXBUF_INLINE_ICON_SELECT_INVERT,     "gq-icon-select-invert" },
 144         {  PIXBUF_INLINE_ICON_SELECT_NONE,       "gq-icon-select-none" },
 145         {  PIXBUF_INLINE_ICON_SELECT_RECTANGLE,  "gq-icon-select-rectangle" },
 146         {  PIXBUF_INLINE_ICON_SORT,              "gq-icon-sort" },
 147         {  PIXBUF_INLINE_ICON_THUMB,             "gq-icon-thumb" },
 148         {  PIXBUF_INLINE_ICON_TOOLS,             "gq-icon-tools" },
 149         {  PIXBUF_INLINE_ICON_VIEW,              "gq-icon-view" },
 150         {  PIXBUF_INLINE_ICON_ZOOMFILLHOR,       "gq-icon-zoomfillhor" },
 151         {  PIXBUF_INLINE_ICON_ZOOMFILLVERT,      "gq-icon-zoomfillvert" },
 152         {  PIXBUF_INLINE_LOGO,                   "geeqie-logo" },
 153         {  PIXBUF_INLINE_METADATA,               "gq-icon-metadata" },
 154         {  PIXBUF_INLINE_SCROLLER,               "gq-scroller" },
 155         {  PIXBUF_INLINE_SPLIT_PANE_SYNC,        "gq-icon-split-pane-sync" },
 156         {  PIXBUF_INLINE_UNKNOWN,                "gq-icon-unknown" },
 157         {  PIXBUF_INLINE_VIDEO,                  "gq-icon-video" },
 158         {  nullptr,                              nullptr }
 159 };
 160
 161 GdkPixbuf *pixbuf_inline(const gchar *key)
 162 {
 163         gboolean dark = FALSE;
 164         gchar *file_name = nullptr;
 165         gchar *path;
 166         gchar *theme_name;
 167         GdkPixbuf *icon_pixbuf;
 168         GError *error = nullptr;
 169         GInputStream *in_stream;
 170         gint i;
 171         GtkSettings *settings;
 172
 173         if (!key) return nullptr;
 174
 175         settings = gtk_settings_get_default();
 176         g_object_get(settings, "gtk-theme-name", &theme_name, nullptr);
 177         dark = g_str_has_suffix(theme_name, "dark");
 178         g_free(theme_name);
 179
 180         i = 0;
 181         while (inline_pixbuf_data[i].key)
 182                 {
 183                 if (strcmp(inline_pixbuf_data[i].key, key) == 0)
 184                         {
 185                         file_name = g_strconcat(inline_pixbuf_data[i].data, dark ? "-dark" : "", ".png", nullptr);
 186                         path = g_build_filename(GQ_RESOURCE_PATH_ICONS, file_name, nullptr);
 187                         g_free(file_name);
 188
 189                         in_stream = g_resources_open_stream(path, G_RESOURCE_LOOKUP_FLAGS_NONE, &error);
 190                         g_free(path);
 191
 192                         if (error)
 193                                 {
 194                                 g_error_free(error);
 195                                 error = nullptr;
 196
 197                                 file_name = g_strconcat(inline_pixbuf_data[i].data, ".png", nullptr);
 198                                 path = g_build_filename(GQ_RESOURCE_PATH_ICONS, file_name, nullptr);
 199                                 g_free(file_name);
 200
 201                                 in_stream = g_resources_open_stream(path, G_RESOURCE_LOOKUP_FLAGS_NONE, &error);
 202                                 g_free(path);
 203                                 }
 204
 205                         if (error)
 206                                 {
 207                                 log_printf("warning: inline pixbuf error: %s", error->message);
 208                                 g_error_free(error);
 209                                 g_object_unref(in_stream);
 210                                 return nullptr;
 211                                 }
 212
 213                         icon_pixbuf = gdk_pixbuf_new_from_stream(in_stream, nullptr, &error);
 214                         g_object_unref(in_stream);
 215
 216                         if (error)
 217                                 {
 218                                 log_printf("warning: inline pixbuf error: %s", error->message);
 219                                 g_error_free(error);
 220                                 return nullptr;
 221                                 }
 222
 223                         return icon_pixbuf;
 224                         }
 225                 i++;
 226                 }
 227
 228         log_printf("warning: inline pixbuf key \"%s\" not found.\n", key);
 229
 230         return nullptr;
 231 }
 232
 233 static void register_stock_icon(const gchar *key, GdkPixbuf *pixbuf)
 234 {
 235         static GtkIconFactory *icon_factory = nullptr;
 236         GtkIconSet *icon_set;
 237
 238         if (!icon_factory)
 239                 {
 240                 icon_factory = gtk_icon_factory_new();
 241                 gtk_icon_factory_add_default(icon_factory);
 242                 }
 243
 244         icon_set = gtk_icon_set_new_from_pixbuf(pixbuf);
 245         gtk_icon_factory_add(icon_factory, key, icon_set);
 246 }
 247
 248
 249 void pixbuf_inline_register_stock_icons()
 250 {
 251         gint i;
 252
 253         i = 0;
 254         while (inline_pixbuf_data[i].key)
 255                 {
 256                 register_stock_icon(inline_pixbuf_data[i].key, pixbuf_inline(inline_pixbuf_data[i].key));
 257                 i++;
 258                 }
 259 }
 260
 261 gboolean register_theme_icon_as_stock(const gchar *key, const gchar *icon)
 262 {
 263         GtkIconTheme *icon_theme;
 264         GdkPixbuf *pixbuf;
 265         GError *error = nullptr;
 266
 267         icon_theme = gtk_icon_theme_get_default();
 268
 269         if (gtk_icon_theme_has_icon(icon_theme, key)) return FALSE;
 270
 271         pixbuf = gtk_icon_theme_load_icon(icon_theme,
 272                            icon, /* icon name */
 273                            64, /* size */
 274                            static_cast<GtkIconLookupFlags>(0),  /* flags */
 275                            &error);
 276         if (!pixbuf)
 277                 {
 278                 if (error)
 279                         {
 280                         DEBUG_1("Couldn't load icon %s: %s", icon, error->message);
 281                         g_error_free(error);
 282                         error = nullptr;
 283                         }
 284
 285                 if (strchr(icon, '.'))
 286                         {
 287                         /* try again without extension */
 288                         gchar *icon2 = remove_extension_from_path(icon);
 289                         pixbuf = gtk_icon_theme_load_icon(icon_theme,
 290                                            icon2, /* icon name */
 291                                            64, /* size */
 292                                            static_cast<GtkIconLookupFlags>(0),  /* flags */
 293                                            &error);
 294                         if (error)
 295                                 {
 296                                 DEBUG_1("Couldn't load icon %s: %s", icon2, error->message);
 297                                 g_error_free(error);
 298                                 error = nullptr;
 299
 300                                 /* try as an absolute path */
 301                                 pixbuf = gdk_pixbuf_new_from_file(icon, &error);
 302                                 if (error)
 303                                         {
 304                                         DEBUG_1("Couldn't load icon as absolute path %s: %s", icon, error->message);
 305                                         g_error_free(error);
 306                                         }
 307                                 }
 308                         g_free(icon2);
 309                         }
 310                 }
 311
 312         if (!pixbuf) return FALSE;
 313
 314         register_stock_icon(key, pixbuf);
 315         return TRUE;
 316 }
 317
 318 gboolean pixbuf_scale_aspect(gint req_w, gint req_h,
 319                              gint old_w, gint old_h,
 320                              gint *new_w, gint *new_h)
 321 {
 322         if ((static_cast<gdouble>(req_w) / old_w) < (static_cast<gdouble>(req_h) / old_h))
 323                 {
 324                 *new_w = req_w;
 325                 *new_h = static_cast<gdouble>(*new_w) / old_w * old_h;
 326                 if (*new_h < 1) *new_h = 1;
 327                 }
 328         else
 329                 {
 330                 *new_h = req_h;
 331                 *new_w = static_cast<gdouble>(*new_h) / old_h * old_w;
 332                 if (*new_w < 1) *new_w = 1;
 333                 }
 334
 335         return (*new_w != old_w || *new_h != old_h);
 336 }
 337
 338 GdkPixbuf *pixbuf_fallback(FileData *fd, gint requested_width, gint requested_height)
 339 {
 340         GdkPixbuf *pixbuf;
 341
 342         switch (fd->format_class)
 343                 {
 344                 case FORMAT_CLASS_UNKNOWN:
 345                         pixbuf = pixbuf_inline(PIXBUF_INLINE_UNKNOWN);
 346                         break;
 347                 case FORMAT_CLASS_META:
 348                         pixbuf = pixbuf_inline(PIXBUF_INLINE_METADATA);
 349                         break;
 350                 case FORMAT_CLASS_VIDEO:
 351                         pixbuf = pixbuf_inline(PIXBUF_INLINE_VIDEO);
 352                         break;
 353                 case FORMAT_CLASS_COLLECTION:
 354                         pixbuf = pixbuf_inline(PIXBUF_INLINE_COLLECTION);
 355                         break;
 356                 case FORMAT_CLASS_DOCUMENT:
 357                         pixbuf = pixbuf_inline(PIXBUF_INLINE_ICON_PDF);
 358                         break;
 359                 case FORMAT_CLASS_ARCHIVE:
 360                         pixbuf = pixbuf_inline(PIXBUF_INLINE_ARCHIVE);
 361                         break;
 362                 default:
 363                         pixbuf = pixbuf_inline(PIXBUF_INLINE_BROKEN);
 364                 }
 365
 366         if (requested_width && requested_height)
 367                 {
 368                 gint w = gdk_pixbuf_get_width(pixbuf);
 369                 gint h = gdk_pixbuf_get_height(pixbuf);
 370
 371                 if (w > requested_width || h > requested_height)
 372                         {
 373                         gint nw;
 374                         gint nh;
 375
 376                         if (pixbuf_scale_aspect(requested_width, requested_height,
 377                                                           w, h, &nw, &nh))
 378                                 {
 379                                 GdkPixbuf *tmp;
 380
 381                                 tmp = pixbuf;
 382                                 pixbuf = gdk_pixbuf_scale_simple(tmp, nw, nh, GDK_INTERP_TILES);
 383                                 g_object_unref(G_OBJECT(tmp));
 384                                 }
 385                         }
 386                 }
 387         return pixbuf;
 388 }
 389
 390
 391 /*
 392  *-----------------------------------------------------------------------------
 393  * misc utils
 394  *-----------------------------------------------------------------------------
 395  */
 396
 397 gboolean util_clip_region(gint x, gint y, gint w, gint h,
 398                           gint clip_x, gint clip_y, gint clip_w, gint clip_h,
 399                           gint *rx, gint *ry, gint *rw, gint *rh)
 400 {
 401         if (clip_x + clip_w <= x ||
 402             clip_x >= x + w ||
 403             clip_y + clip_h <= y ||
 404             clip_y >= y + h)
 405                 {
 406                 return FALSE;
 407                 }
 408
 409         *rx = MAX(x, clip_x);
 410         *rw = MIN((x + w), (clip_x + clip_w)) - *rx;
 411
 412         *ry = MAX(y, clip_y);
 413         *rh = MIN((y + h), (clip_y + clip_h)) - *ry;
 414
 415         return TRUE;
 416 }
 417
 418 /*
 419  *-----------------------------------------------------------------------------
 420  * pixbuf rotation
 421  *-----------------------------------------------------------------------------
 422  */
 423
 424 static void pixbuf_copy_block_rotate(guchar *src, gint src_row_stride, gint x, gint y,
 425                                      guchar *dest, gint dest_row_stride, gint w, gint h,
 426                                      gint bytes_per_pixel, gboolean counter_clockwise)
 427 {
 428         gint i;
 429         gint j;
 430         guchar *sp;
 431         guchar *dp;
 432
 433         for (i = 0; i < h; i++)
 434                 {
 435                 sp = src + ((i + y) * src_row_stride) + (x * bytes_per_pixel);
 436                 for (j = 0; j < w; j++)
 437                         {
 438                         if (counter_clockwise)
 439                                 {
 440                                 dp = dest + ((w - j - 1) * dest_row_stride) + (i * bytes_per_pixel);
 441                                 }
 442                         else
 443                                 {
 444                                 dp = dest + (j * dest_row_stride) + ((h - i - 1) * bytes_per_pixel);
 445                                 }
 446                         *(dp++) = *(sp++);      /* r */
 447                         *(dp++) = *(sp++);      /* g */
 448                         *(dp++) = *(sp++);      /* b */
 449                         if (bytes_per_pixel == 4) *(dp) = *(sp++);      /* a */
 450                         }
 451                 }
 452
 453 }
 454
 455 static void pixbuf_copy_block(guchar *src, gint src_row_stride, gint w, gint h,
 456                               guchar *dest, gint dest_row_stride, gint x, gint y, gint bytes_per_pixel)
 457 {
 458         gint i;
 459         guchar *sp;
 460         guchar *dp;
 461
 462         for (i = 0; i < h; i++)
 463                 {
 464                 sp = src + (i * src_row_stride);
 465                 dp = dest + ((y + i) * dest_row_stride) + (x * bytes_per_pixel);
 466                 memcpy(dp, sp, w * bytes_per_pixel);
 467                 }
 468 }
 469
 470 enum {
 471         ROTATE_BUFFER_WIDTH = 48,
 472         ROTATE_BUFFER_HEIGHT = 48
 473 };
 474
 475 /*
 476  * Returns a copy of pixbuf src rotated 90 degrees clockwise or 90 counterclockwise
 477  *
 478  */
 479 GdkPixbuf *pixbuf_copy_rotate_90(GdkPixbuf *src, gboolean counter_clockwise)
 480 {
 481         GdkPixbuf *dest;
 482         gboolean has_alpha;
 483         gint sw;
 484         gint sh;
 485         gint srs;
 486         gint dw;
 487         gint dh;
 488         gint drs;
 489         guchar *s_pix;
 490         guchar *d_pix;
 491         gint i;
 492         gint j;
 493         gint a;
 494         GdkPixbuf *buffer;
 495         guchar *b_pix;
 496         gint brs;
 497         gint w;
 498         gint h;
 499
 500         if (!src) return nullptr;
 501
 502         sw = gdk_pixbuf_get_width(src);
 503         sh = gdk_pixbuf_get_height(src);
 504         has_alpha = gdk_pixbuf_get_has_alpha(src);
 505         srs = gdk_pixbuf_get_rowstride(src);
 506         s_pix = gdk_pixbuf_get_pixels(src);
 507
 508         dw = sh;
 509         dh = sw;
 510         dest = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8, dw, dh);
 511         drs = gdk_pixbuf_get_rowstride(dest);
 512         d_pix = gdk_pixbuf_get_pixels(dest);
 513
 514         a = (has_alpha ? 4 : 3);
 515
 516         buffer = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8,
 517                                 ROTATE_BUFFER_WIDTH, ROTATE_BUFFER_HEIGHT);
 518         b_pix = gdk_pixbuf_get_pixels(buffer);
 519         brs = gdk_pixbuf_get_rowstride(buffer);
 520
 521         for (i = 0; i < sh; i+= ROTATE_BUFFER_WIDTH)
 522                 {
 523                 w = MIN(ROTATE_BUFFER_WIDTH, (sh - i));
 524                 for (j = 0; j < sw; j += ROTATE_BUFFER_HEIGHT)
 525                         {
 526                         gint x;
 527                         gint y;
 528
 529                         h = MIN(ROTATE_BUFFER_HEIGHT, (sw - j));
 530                         pixbuf_copy_block_rotate(s_pix, srs, j, i,
 531                                                  b_pix, brs, h, w,
 532                                                  a, counter_clockwise);
 533
 534                         if (counter_clockwise)
 535                                 {
 536                                 x = i;
 537                                 y = sw - h - j;
 538                                 }
 539                         else
 540                                 {
 541                                 x = sh - w - i;
 542                                 y = j;
 543                                 }
 544                         pixbuf_copy_block(b_pix, brs, w, h,
 545                                           d_pix, drs, x, y, a);
 546                         }
 547                 }
 548
 549         g_object_unref(buffer);
 550
 551 #if 0
 552         /* this is the simple version of rotation (roughly 2-4x slower) */
 553
 554         for (i = 0; i < sh; i++)
 555                 {
 556                 sp = s_pix + (i * srs);
 557                 for (j = 0; j < sw; j++)
 558                         {
 559                         if (counter_clockwise)
 560                                 {
 561                                 dp = d_pix + ((dh - j - 1) * drs) + (i * a);
 562                                 }
 563                         else
 564                                 {
 565                                 dp = d_pix + (j * drs) + ((dw - i - 1) * a);
 566                                 }
 567
 568                         *(dp++) = *(sp++);      /* r */
 569                         *(dp++) = *(sp++);      /* g */
 570                         *(dp++) = *(sp++);      /* b */
 571                         if (has_alpha) *(dp) = *(sp++); /* a */
 572                         }
 573                 }
 574 #endif
 575
 576         return dest;
 577 }
 578
 579 /*
 580  * Returns a copy of pixbuf mirrored and or flipped.
 581  * TO do a 180 degree rotations set both mirror and flipped TRUE
 582  * if mirror and flip are FALSE, result is a simple copy.
 583  */
 584 GdkPixbuf *pixbuf_copy_mirror(GdkPixbuf *src, gboolean mirror, gboolean flip)
 585 {
 586         GdkPixbuf *dest;
 587         gboolean has_alpha;
 588         gint w;
 589         gint h;
 590         gint srs;
 591         gint drs;
 592         guchar *s_pix;
 593         guchar *d_pix;
 594         guchar *sp;
 595         guchar *dp;
 596         gint i;
 597         gint j;
 598         gint a;
 599
 600         if (!src) return nullptr;
 601
 602         w = gdk_pixbuf_get_width(src);
 603         h = gdk_pixbuf_get_height(src);
 604         has_alpha = gdk_pixbuf_get_has_alpha(src);
 605         srs = gdk_pixbuf_get_rowstride(src);
 606         s_pix = gdk_pixbuf_get_pixels(src);
 607
 608         dest = gdk_pixbuf_new(GDK_COLORSPACE_RGB, has_alpha, 8, w, h);
 609         drs = gdk_pixbuf_get_rowstride(dest);
 610         d_pix = gdk_pixbuf_get_pixels(dest);
 611
 612         a = has_alpha ? 4 : 3;
 613
 614         for (i = 0; i < h; i++)
 615                 {
 616                 sp = s_pix + (i * srs);
 617                 if (flip)
 618                         {
 619                         dp = d_pix + ((h - i - 1) * drs);
 620                         }
 621                 else
 622                         {
 623                         dp = d_pix + (i * drs);
 624                         }
 625                 if (mirror)
 626                         {
 627                         dp += (w - 1) * a;
 628                         for (j = 0; j < w; j++)
 629                                 {
 630                                 *(dp++) = *(sp++);      /* r */
 631                                 *(dp++) = *(sp++);      /* g */
 632                                 *(dp++) = *(sp++);      /* b */
 633                                 if (has_alpha) *(dp) = *(sp++); /* a */
 634                                 dp -= (a + 3);
 635                                 }
 636                         }
 637                 else
 638                         {
 639                         for (j = 0; j < w; j++)
 640                                 {
 641                                 *(dp++) = *(sp++);      /* r */
 642                                 *(dp++) = *(sp++);      /* g */
 643                                 *(dp++) = *(sp++);      /* b */
 644                                 if (has_alpha) *(dp++) = *(sp++);       /* a */
 645                                 }
 646                         }
 647                 }
 648
 649         return dest;
 650 }
 651
 652 GdkPixbuf *pixbuf_apply_orientation(GdkPixbuf *pixbuf, gint orientation)
 653 {
 654         GdkPixbuf *dest;
 655         GdkPixbuf *tmp = nullptr;
 656
 657         switch (orientation)
 658                 {
 659                 case EXIF_ORIENTATION_TOP_LEFT:
 660                         dest = gdk_pixbuf_copy(pixbuf);
 661                         break;
 662                 case EXIF_ORIENTATION_TOP_RIGHT:
 663                         /* mirrored */
 664                         dest = pixbuf_copy_mirror(pixbuf, TRUE, FALSE);
 665                         break;
 666                 case EXIF_ORIENTATION_BOTTOM_RIGHT:
 667                         /* upside down */
 668                         dest = pixbuf_copy_mirror(pixbuf, TRUE, TRUE);
 669                         break;
 670                 case EXIF_ORIENTATION_BOTTOM_LEFT:
 671                         /* flipped */
 672                         dest = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 673                         break;
 674                 case EXIF_ORIENTATION_LEFT_TOP:
 675                         tmp = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 676                         dest = pixbuf_copy_rotate_90(tmp, FALSE);
 677                         break;
 678                 case EXIF_ORIENTATION_RIGHT_TOP:
 679                         /* rotated -90 (270) */
 680                         dest = pixbuf_copy_rotate_90(pixbuf, FALSE);
 681                         break;
 682                 case EXIF_ORIENTATION_RIGHT_BOTTOM:
 683                         tmp = pixbuf_copy_mirror(pixbuf, FALSE, TRUE);
 684                         dest = pixbuf_copy_rotate_90(tmp, TRUE);
 685                         break;
 686                 case EXIF_ORIENTATION_LEFT_BOTTOM:
 687                         /* rotated 90 */
 688                         dest = pixbuf_copy_rotate_90(pixbuf, TRUE);
 689                         break;
 690                 default:
 691                         dest = gdk_pixbuf_copy(pixbuf);
 692                         break;
 693                 }
 694         if (tmp) g_object_unref(tmp);
 695         return dest;
 696
 697 }
 698
 699
 700 /*
 701  *-----------------------------------------------------------------------------
 702  * pixbuf drawing (rectangles)
 703  *-----------------------------------------------------------------------------
 704  */
 705
 706 /*
 707  * Fills region of pixbuf at x,y over w,h
 708  * with colors red (r), green (g), blue (b)
 709  * applying alpha (a), use a=255 for solid.
 710  */
 711 void pixbuf_draw_rect_fill(GdkPixbuf *pb,
 712                            gint x, gint y, gint w, gint h,
 713                            gint r, gint g, gint b, gint a)
 714 {
 715         gboolean has_alpha;
 716         gint pw;
 717         gint ph;
 718         gint prs;
 719         guchar *p_pix;
 720         guchar *pp;
 721         gint i;
 722         gint j;
 723
 724         if (!pb) return;
 725
 726         pw = gdk_pixbuf_get_width(pb);
 727         ph = gdk_pixbuf_get_height(pb);
 728
 729         if (x < 0 || x + w > pw) return;
 730         if (y < 0 || y + h > ph) return;
 731
 732         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 733         prs = gdk_pixbuf_get_rowstride(pb);
 734         p_pix = gdk_pixbuf_get_pixels(pb);
 735
 736         const gint p_step = has_alpha ? 4 : 3;
 737
 738         for (i = 0; i < h; i++)
 739                 {
 740                 pp = p_pix + (y + i) * prs + (x * p_step);
 741                 for (j = 0; j < w; j++)
 742                         {
 743                         pp[0] = (r * a + pp[0] * (256-a)) >> 8;
 744                         pp[1] = (g * a + pp[1] * (256-a)) >> 8;
 745                         pp[2] = (b * a + pp[2] * (256-a)) >> 8;
 746                         pp += p_step;
 747                         }
 748                 }
 749 }
 750
 751 #pragma GCC diagnostic push
 752 #pragma GCC diagnostic ignored "-Wunused-function"
 753 void pixbuf_draw_rect_unused(GdkPixbuf *pb,
 754                       gint x, gint y, gint w, gint h,
 755                       gint r, gint g, gint b, gint a,
 756                       gint left, gint right, gint top, gint bottom)
 757 {
 758         pixbuf_draw_rect_fill(pb, x + left, y, w - left - right, top,
 759                               r, g, b ,a);
 760         pixbuf_draw_rect_fill(pb, x + w - right, y, right, h,
 761                               r, g, b ,a);
 762         pixbuf_draw_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
 763                               r, g, b ,a);
 764         pixbuf_draw_rect_fill(pb, x, y, left, h,
 765                               r, g, b ,a);
 766 }
 767 #pragma GCC diagnostic pop
 768
 769 void pixbuf_set_rect_fill(GdkPixbuf *pb,
 770                           gint x, gint y, gint w, gint h,
 771                           gint r, gint g, gint b, gint a)
 772 {
 773         gboolean has_alpha;
 774         gint pw;
 775         gint ph;
 776         gint prs;
 777         guchar *p_pix;
 778         guchar *pp;
 779         gint i;
 780         gint j;
 781
 782         if (!pb) return;
 783
 784         pw = gdk_pixbuf_get_width(pb);
 785         ph = gdk_pixbuf_get_height(pb);
 786
 787         if (x < 0 || x + w > pw) return;
 788         if (y < 0 || y + h > ph) return;
 789
 790         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 791         prs = gdk_pixbuf_get_rowstride(pb);
 792         p_pix = gdk_pixbuf_get_pixels(pb);
 793
 794         const gint p_step = has_alpha ? 4 : 3;
 795
 796         for (i = 0; i < h; i++)
 797                 {
 798                 pp = p_pix + (y + i) * prs + (x * p_step);
 799                 for (j = 0; j < w; j++)
 800                         {
 801                         *pp = r; pp++;
 802                         *pp = g; pp++;
 803                         *pp = b; pp++;
 804                         if (has_alpha) { *pp = a; pp++; }
 805                         }
 806                 }
 807 }
 808
 809 void pixbuf_set_rect(GdkPixbuf *pb,
 810                      gint x, gint y, gint w, gint h,
 811                      gint r, gint g, gint b, gint a,
 812                      gint left, gint right, gint top, gint bottom)
 813 {
 814         pixbuf_set_rect_fill(pb, x + left, y, w - left - right, top,
 815                              r, g, b ,a);
 816         pixbuf_set_rect_fill(pb, x + w - right, y, right, h,
 817                              r, g, b ,a);
 818         pixbuf_set_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
 819                              r, g, b ,a);
 820         pixbuf_set_rect_fill(pb, x, y, left, h,
 821                              r, g, b ,a);
 822 }
 823
 824 void pixbuf_pixel_set(GdkPixbuf *pb, gint x, gint y, gint r, gint g, gint b, gint a)
 825 {
 826         guchar *buf;
 827         gboolean has_alpha;
 828         gint rowstride;
 829         guchar *p;
 830
 831         if (x < 0 || x >= gdk_pixbuf_get_width(pb) ||
 832             y < 0 || y >= gdk_pixbuf_get_height(pb)) return;
 833
 834         buf = gdk_pixbuf_get_pixels(pb);
 835         has_alpha = gdk_pixbuf_get_has_alpha(pb);
 836         rowstride = gdk_pixbuf_get_rowstride(pb);
 837
 838         p = buf + (y * rowstride) + (x * (has_alpha ? 4 : 3));
 839         *p = r; p++;
 840         *p = g; p++;
 841         *p = b; p++;
 842         if (has_alpha) *p = a;
 843 }
 844
 845
 846 /*
 847  *-----------------------------------------------------------------------------
 848  * pixbuf text rendering
 849  *-----------------------------------------------------------------------------
 850  */
 851
 852 static void pixbuf_copy_font(GdkPixbuf *src, gint sx, gint sy,
 853                              GdkPixbuf *dest, gint dx, gint dy,
 854                              gint w, gint h,
 855                              guint8 r, guint8 g, guint8 b, guint8 a)
 856 {
 857         gint sw;
 858         gint sh;
 859         gint srs;
 860         gboolean s_alpha;
 861         gint s_step;
 862         guchar *s_pix;
 863         gint dw;
 864         gint dh;
 865         gint drs;
 866         gboolean d_alpha;
 867         gint d_step;
 868         guchar *d_pix;
 869
 870         guchar *sp;
 871         guchar *dp;
 872         gint i;
 873         gint j;
 874
 875         if (!src || !dest) return;
 876
 877         sw = gdk_pixbuf_get_width(src);
 878         sh = gdk_pixbuf_get_height(src);
 879
 880         if (sx < 0 || sx + w > sw) return;
 881         if (sy < 0 || sy + h > sh) return;
 882
 883         dw = gdk_pixbuf_get_width(dest);
 884         dh = gdk_pixbuf_get_height(dest);
 885
 886         if (dx < 0 || dx + w > dw) return;
 887         if (dy < 0 || dy + h > dh) return;
 888
 889         s_alpha = gdk_pixbuf_get_has_alpha(src);
 890         d_alpha = gdk_pixbuf_get_has_alpha(dest);
 891         srs = gdk_pixbuf_get_rowstride(src);
 892         drs = gdk_pixbuf_get_rowstride(dest);
 893         s_pix = gdk_pixbuf_get_pixels(src);
 894         d_pix = gdk_pixbuf_get_pixels(dest);
 895
 896         s_step = (s_alpha) ? 4 : 3;
 897         d_step = (d_alpha) ? 4 : 3;
 898
 899         for (i = 0; i < h; i++)
 900                 {
 901                 sp = s_pix + (sy + i) * srs + sx * s_step;
 902                 dp = d_pix + (dy + i) * drs + dx * d_step;
 903                 for (j = 0; j < w; j++)
 904                         {
 905                         if (*sp)
 906                                 {
 907                                 guint8 asub;
 908
 909                                 asub = a * sp[0] / 255;
 910                                 *dp = (r * asub + *dp * (256-asub)) >> 8;
 911                                 dp++;
 912                                 asub = a * sp[1] / 255;
 913                                 *dp = (g * asub + *dp * (256-asub)) >> 8;
 914                                 dp++;
 915                                 asub = a * sp[2] / 255;
 916                                 *dp = (b * asub + *dp * (256-asub)) >> 8;
 917                                 dp++;
 918
 919                                 if (d_alpha)
 920                                         {
 921                                         *dp = MAX(*dp, a * ((sp[0] + sp[1] + sp[2]) / 3) / 255);
 922                                         dp++;
 923                                         }
 924                                 }
 925                         else
 926                                 {
 927                                 dp += d_step;
 928                                 }
 929
 930                         sp += s_step;
 931                         }
 932                 }
 933 }
 934
 935 void pixbuf_draw_layout(GdkPixbuf *pixbuf, PangoLayout *layout, GtkWidget *,
 936                         gint x, gint y,
 937                         guint8 r, guint8 g, guint8 b, guint8 a)
 938 {
 939         GdkPixbuf *buffer;
 940         gint w;
 941         gint h;
 942         gint sx;
 943         gint sy;
 944         gint dw;
 945         gint dh;
 946         cairo_surface_t *source;
 947         cairo_t *cr;
 948
 949         pango_layout_get_pixel_size(layout, &w, &h);
 950         if (w < 1 || h < 1) return;
 951
 952         source = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
 953
 954         cr = cairo_create (source);
 955         cairo_set_source_rgb(cr, 0, 0, 0);
 956         cairo_rectangle (cr, 0, 0, w, h);
 957         cairo_fill (cr);
 958         cairo_set_source_rgb(cr, 1, 1, 1);
 959         pango_cairo_show_layout (cr, layout);
 960         cairo_destroy (cr);
 961
 962         buffer = gdk_pixbuf_new_from_data (cairo_image_surface_get_data (source),
 963                                            GDK_COLORSPACE_RGB,
 964                                            cairo_image_surface_get_format (source) == CAIRO_FORMAT_ARGB32,
 965                                            8,
 966                                            cairo_image_surface_get_width (source),
 967                                            cairo_image_surface_get_height (source),
 968                                            cairo_image_surface_get_stride (source),
 969                                            nullptr,
 970                                            nullptr);
 971
 972         sx = 0;
 973         sy = 0;
 974         dw = gdk_pixbuf_get_width(pixbuf);
 975         dh = gdk_pixbuf_get_height(pixbuf);
 976
 977         if (x < 0)
 978                 {
 979                 w += x;
 980                 sx = -x;
 981                 x = 0;
 982                 }
 983
 984         if (y < 0)
 985                 {
 986                 h += y;
 987                 sy = -y;
 988                 y = 0;
 989                 }
 990
 991         if (x + w > dw) w = dw - x;
 992         if (y + h > dh) h = dh - y;
 993
 994         pixbuf_copy_font(buffer, sx, sy,
 995                          pixbuf, x, y, w, h,
 996                          r, g, b, a);
 997
 998         g_object_unref(buffer);
 999         cairo_surface_destroy(source);
1000 }
1001
1002 /*
1003  *-----------------------------------------------------------------------------
1004  * pixbuf drawing (triangle)
1005  *-----------------------------------------------------------------------------
1006  */
1007
1008 void util_clip_triangle(gint x1, gint y1, gint x2, gint y2, gint x3, gint y3,
1009                         gint &rx, gint &ry, gint &rw, gint &rh)
1010 {
1011         rx = std::min({x1, x2, x3});
1012         ry = std::min({y1, y2, y3});
1013         rw = std::max({abs(x1 - x2), abs(x2 - x3), abs(x3 - x1)});
1014         rh = std::max({abs(y1 - y2), abs(y2 - y3), abs(y3 - y1)});
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         gboolean middle = FALSE;
1049
1050         if (!pb) return;
1051
1052         pw = gdk_pixbuf_get_width(pb);
1053         ph = gdk_pixbuf_get_height(pb);
1054
1055         if (!util_clip_region(0, 0, pw, ph,
1056                               clip_x, clip_y, clip_w, clip_h,
1057                               &rx, &ry, &rw, &rh)) return;
1058
1059         util_clip_triangle(x1, y1, x2, y2, x3, y3,
1060                            tx, ty, tw, th);
1061
1062         if (!util_clip_region(rx, ry, rw, rh,
1063                               tx, ty, tw, th,
1064                               &fx1, &fy1, &fw, &fh)) return;
1065         fx2 = fx1 + fw;
1066         fy2 = fy1 + fh;
1067
1068         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1069         prs = gdk_pixbuf_get_rowstride(pb);
1070         p_pix = gdk_pixbuf_get_pixels(pb);
1071
1072         p_step = (has_alpha) ? 4 : 3;
1073
1074         if (y1 > y2)
1075                 {
1076                 std::swap(x1, x2);
1077                 std::swap(y1, y2);
1078                 }
1079         if (y2 > y3)
1080                 {
1081                 std::swap(x2, x3);
1082                 std::swap(y2, y3);
1083                 }
1084         if (y1 > y2)
1085                 {
1086                 std::swap(x1, x2);
1087                 std::swap(y1, y2);
1088                 }
1089
1090         slope1 = static_cast<gdouble>(y2 - y1);
1091         if (slope1) slope1 = static_cast<gdouble>(x2 - x1) / slope1;
1092         slope1_x = x1;
1093         slope1_y = y1;
1094         slope2 = static_cast<gdouble>(y3 - y1);
1095         if (slope2) slope2 = static_cast<gdouble>(x3 - x1) / slope2;
1096
1097         for (y = fy1; y < fy2; y++)
1098                 {
1099                 gint xa;
1100                 gint xb;
1101
1102                 if (!middle && y > y2)
1103                         {
1104                         slope1 = static_cast<gdouble>(y3 - y2);
1105                         if (slope1) slope1 = static_cast<gdouble>(x3 - x2) / slope1;
1106                         slope1_x = x2;
1107                         slope1_y = y2;
1108
1109                         middle = TRUE;
1110                         }
1111
1112                 xa = slope1_x + (slope1 * (y - slope1_y) + 0.5);
1113                 xb = x1 + (slope2 * (y - y1) + 0.5);
1114
1115                 if (xa > xb)
1116                         {
1117                         std::swap(xa, xb);
1118                         }
1119
1120                 xa = CLAMP(xa, fx1, fx2);
1121                 xb = CLAMP(xb, fx1, fx2);
1122
1123                 pp = p_pix + y * prs + xa * p_step;
1124
1125                 while (xa < xb)
1126                         {
1127                         pp[0] = (r * a + pp[0] * (256-a)) >> 8;
1128                         pp[1] = (g * a + pp[1] * (256-a)) >> 8;
1129                         pp[2] = (b * a + pp[2] * (256-a)) >> 8;
1130                         pp += p_step;
1131
1132                         xa++;
1133                         }
1134                 }
1135 }
1136
1137 /*
1138  *-----------------------------------------------------------------------------
1139  * pixbuf drawing (line)
1140  *-----------------------------------------------------------------------------
1141  */
1142
1143 static gboolean util_clip_line(gdouble clip_x, gdouble clip_y, gdouble clip_w, gdouble clip_h,
1144                                gdouble x1, gdouble y1, gdouble x2, gdouble y2,
1145                                gdouble *rx1, gdouble *ry1, gdouble *rx2, gdouble *ry2)
1146 {
1147         gboolean flip = FALSE;
1148         gdouble d;
1149
1150         if (x1 > x2)
1151                 {
1152                 std::swap(x1, x2);
1153                 std::swap(y1, y2);
1154                 flip = TRUE;
1155                 }
1156
1157         if (x2 < clip_x || x1 > clip_x + clip_w) return FALSE;
1158
1159         if (y1 < y2)
1160                 {
1161                 if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
1162                 }
1163         else
1164                 {
1165                 if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
1166                 }
1167
1168         d = x2 - x1;
1169         if (d > 0.0)
1170                 {
1171                 gdouble slope;
1172
1173                 slope = (y2 - y1) / d;
1174                 if (x1 < clip_x)
1175                         {
1176                         y1 = y1 + slope * (clip_x - x1);
1177                         x1 = clip_x;
1178                         }
1179                 if (x2 > clip_x + clip_w)
1180                         {
1181                         y2 = y2 + slope * (clip_x + clip_w - x2);
1182                         x2 = clip_x + clip_w;
1183                         }
1184                 }
1185
1186         if (y1 < y2)
1187                 {
1188                 if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
1189                 }
1190         else
1191                 {
1192                 if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
1193
1194                 std::swap(x1, x2);
1195                 std::swap(y1, y2);
1196                 flip = !flip;
1197                 }
1198
1199         d = y2 - y1;
1200         if (d > 0.0)
1201                 {
1202                 gdouble slope;
1203
1204                 slope = (x2 - x1) / d;
1205                 if (y1 < clip_y)
1206                         {
1207                         x1 = x1 + slope * (clip_y - y1);
1208                         y1 = clip_y;
1209                         }
1210                 if (y2 > clip_y + clip_h)
1211                         {
1212                         x2 = x2 + slope * (clip_y + clip_h - y2);
1213                         y2 = clip_y + clip_h;
1214                         }
1215                 }
1216
1217         if (flip)
1218                 {
1219                 *rx1 = x2;
1220                 *ry1 = y2;
1221                 *rx2 = x1;
1222                 *ry2 = y1;
1223                 }
1224         else
1225                 {
1226                 *rx1 = x1;
1227                 *ry1 = y1;
1228                 *rx2 = x2;
1229                 *ry2 = y2;
1230                 }
1231
1232         return TRUE;
1233 }
1234
1235 void pixbuf_draw_line(GdkPixbuf *pb,
1236                       gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1237                       gint x1, gint y1, gint x2, gint y2,
1238                       guint8 r, guint8 g, guint8 b, guint8 a)
1239 {
1240         gboolean has_alpha;
1241         gint pw;
1242         gint ph;
1243         gint prs;
1244         gint rx;
1245         gint ry;
1246         gint rw;
1247         gint rh;
1248         gdouble rx1;
1249         gdouble ry1;
1250         gdouble rx2;
1251         gdouble ry2;
1252         guchar *p_pix;
1253         guchar *pp;
1254         gint p_step;
1255         gdouble slope;
1256         gdouble x;
1257         gdouble y;
1258         gint px;
1259         gint py;
1260         gint cx1;
1261         gint cy1;
1262         gint cx2;
1263         gint cy2;
1264
1265         if (!pb) return;
1266
1267         pw = gdk_pixbuf_get_width(pb);
1268         ph = gdk_pixbuf_get_height(pb);
1269
1270         if (!util_clip_region(0, 0, pw, ph,
1271                               clip_x, clip_y, clip_w, clip_h,
1272                               &rx, &ry, &rw, &rh)) return;
1273         if (!util_clip_line(static_cast<gdouble>(rx), static_cast<gdouble>(ry), static_cast<gdouble>(rw), static_cast<gdouble>(rh),
1274                             static_cast<gdouble>(x1), static_cast<gdouble>(y1), static_cast<gdouble>(x2), static_cast<gdouble>(y2),
1275                             &rx1, &ry1, &rx2, &ry2)) return;
1276
1277         cx1 = rx;
1278         cy1 = ry;
1279         cx2 = rx + rw;
1280         cy2 = ry + rh;
1281
1282         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1283         prs = gdk_pixbuf_get_rowstride(pb);
1284         p_pix = gdk_pixbuf_get_pixels(pb);
1285
1286         p_step = (has_alpha) ? 4 : 3;
1287
1288         if (fabs(rx2 - rx1) > fabs(ry2 - ry1))
1289                 {
1290                 if (rx1 > rx2)
1291                         {
1292                         std::swap(rx1, rx2);
1293                         std::swap(ry1, ry2);
1294                         }
1295
1296                 slope = rx2 - rx1;
1297                 if (slope != 0.0) slope = (ry2 - ry1) / slope;
1298                 for (x = rx1; x < rx2; x += 1.0)
1299                         {
1300                         px = static_cast<gint>(x + 0.5);
1301                         py = static_cast<gint>(ry1 + (x - rx1) * slope + 0.5);
1302
1303                         if (px >=  cx1 && px < cx2 && py >= cy1 && py < cy2)
1304                                 {
1305                                 pp = p_pix + py * prs + px * p_step;
1306                                 *pp = (r * a + *pp * (256-a)) >> 8;
1307                                 pp++;
1308                                 *pp = (g * a + *pp * (256-a)) >> 8;
1309                                 pp++;
1310                                 *pp = (b * a + *pp * (256-a)) >> 8;
1311                                 }
1312                         }
1313                 }
1314         else
1315                 {
1316                 if (ry1 > ry2)
1317                         {
1318                         std::swap(rx1, rx2);
1319                         std::swap(ry1, ry2);
1320                         }
1321
1322                 slope = ry2 - ry1;
1323                 if (slope != 0.0) slope = (rx2 - rx1) / slope;
1324                 for (y = ry1; y < ry2; y += 1.0)
1325                         {
1326                         px = static_cast<gint>(rx1 + (y - ry1) * slope + 0.5);
1327                         py = static_cast<gint>(y + 0.5);
1328
1329                         if (px >=  cx1 && px < cx2 && py >= cy1 && py < cy2)
1330                                 {
1331                                 pp = p_pix + py * prs + px * p_step;
1332                                 *pp = (r * a + *pp * (256-a)) >> 8;
1333                                 pp++;
1334                                 *pp = (g * a + *pp * (256-a)) >> 8;
1335                                 pp++;
1336                                 *pp = (b * a + *pp * (256-a)) >> 8;
1337                                 }
1338                         }
1339                 }
1340 }
1341
1342 /*
1343  *-----------------------------------------------------------------------------
1344  * pixbuf drawing (fades and shadows)
1345  *-----------------------------------------------------------------------------
1346  */
1347
1348 static void pixbuf_draw_fade_linear(guchar *p_pix, gint prs, gboolean has_alpha,
1349                                     gint s, gboolean vertical, gint border,
1350                                     gint x1, gint y1, gint x2, gint y2,
1351                                     guint8 r, guint8 g, guint8 b, guint8 a)
1352 {
1353         guchar *pp;
1354         gint p_step;
1355         guint8 n = a;
1356         gint i;
1357         gint j;
1358
1359         p_step = (has_alpha) ? 4 : 3;
1360         for (j = y1; j < y2; j++)
1361                 {
1362                 pp = p_pix + j * prs + x1 * p_step;
1363                 if (!vertical) n = a - a * abs(j - s) / border;
1364                 for (i = x1; i < x2; i++)
1365                         {
1366                         if (vertical) n = a - a * abs(i - s) / border;
1367                         pp[0] = (r * n + pp[0] * (256-n)) >> 8;
1368                         pp[1] = (g * n + pp[1] * (256-n)) >> 8;
1369                         pp[2] = (b * n + pp[2] * (256-n)) >> 8;
1370                         pp += p_step;
1371                         }
1372                 }
1373 }
1374
1375 static void pixbuf_draw_fade_radius(guchar *p_pix, gint prs, gboolean has_alpha,
1376                                     gint sx, gint sy, gint border,
1377                                     gint x1, gint y1, gint x2, gint y2,
1378                                     guint8, guint8 g, guint8 b, guint8 a)
1379 {
1380         guchar *pp;
1381         gint p_step;
1382         gint i;
1383         gint j;
1384
1385         p_step = (has_alpha) ? 4 : 3;
1386         for (j = y1; j < y2; j++)
1387                 {
1388                 pp = p_pix + j * prs + x1 * p_step;
1389                 for (i = x1; i < x2; i++)
1390                         {
1391                         guint8 n;
1392                         gint r;
1393
1394                         r = MIN(border, (gint)hypot(i - sx, j - sy));
1395                         n = a - a * r / border;
1396                         pp[0] = (r * n + pp[0] * (256-n)) >> 8;
1397                         pp[1] = (g * n + pp[1] * (256-n)) >> 8;
1398                         pp[2] = (b * n + pp[2] * (256-n)) >> 8;
1399                         pp += p_step;
1400                         }
1401                 }
1402 }
1403
1404 void pixbuf_draw_shadow(GdkPixbuf *pb,
1405                         gint clip_x, gint clip_y, gint clip_w, gint clip_h,
1406                         gint x, gint y, gint w, gint h, gint border,
1407                         guint8 r, guint8 g, guint8 b, guint8 a)
1408 {
1409         gint has_alpha;
1410         gint pw;
1411         gint ph;
1412         gint prs;
1413         gint rx;
1414         gint ry;
1415         gint rw;
1416         gint rh;
1417         gint fx;
1418         gint fy;
1419         gint fw;
1420         gint fh;
1421         guchar *p_pix;
1422
1423         if (!pb) return;
1424
1425         pw = gdk_pixbuf_get_width(pb);
1426         ph = gdk_pixbuf_get_height(pb);
1427
1428         if (!util_clip_region(0, 0, pw, ph,
1429                               clip_x, clip_y, clip_w, clip_h,
1430                               &rx, &ry, &rw, &rh)) return;
1431
1432         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1433         prs = gdk_pixbuf_get_rowstride(pb);
1434         p_pix = gdk_pixbuf_get_pixels(pb);
1435
1436         if (util_clip_region(x + border, y + border, w - border * 2, h - border * 2,
1437                              rx, ry, rw, rh,
1438                              &fx, &fy, &fw, &fh))
1439                 {
1440                 pixbuf_draw_rect_fill(pb, fx, fy, fw, fh, r, g, b, a);
1441                 }
1442
1443         if (border < 1) return;
1444
1445         if (util_clip_region(x, y + border, border, h - border * 2,
1446                              rx, ry, rw, rh,
1447                              &fx, &fy, &fw, &fh))
1448                 {
1449                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1450                                         x + border, TRUE, border,
1451                                         fx, fy, fx + fw, fy + fh,
1452                                         r, g, b, a);
1453                 }
1454         if (util_clip_region(x + w - border, y + border, border, h - border * 2,
1455                              rx, ry, rw, rh,
1456                              &fx, &fy, &fw, &fh))
1457                 {
1458                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1459                                         x + w - border, TRUE, border,
1460                                         fx, fy, fx + fw, fy + fh,
1461                                         r, g, b, a);
1462                 }
1463         if (util_clip_region(x + border, y, w - border * 2, border,
1464                              rx, ry, rw, rh,
1465                              &fx, &fy, &fw, &fh))
1466                 {
1467                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1468                                         y + border, FALSE, border,
1469                                         fx, fy, fx + fw, fy + fh,
1470                                         r, g, b, a);
1471                 }
1472         if (util_clip_region(x + border, y + h - border, w - border * 2, border,
1473                              rx, ry, rw, rh,
1474                              &fx, &fy, &fw, &fh))
1475                 {
1476                 pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
1477                                         y + h - border, FALSE, border,
1478                                         fx, fy, fx + fw, fy + fh,
1479                                         r, g, b, a);
1480                 }
1481         if (util_clip_region(x, y, border, border,
1482                              rx, ry, rw, rh,
1483                              &fx, &fy, &fw, &fh))
1484                 {
1485                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1486                                         x + border, y + border, border,
1487                                         fx, fy, fx + fw, fy + fh,
1488                                         r, g, b, a);
1489                 }
1490         if (util_clip_region(x + w - border, y, border, border,
1491                              rx, ry, rw, rh,
1492                              &fx, &fy, &fw, &fh))
1493                 {
1494                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1495                                         x + w - border, y + border, border,
1496                                         fx, fy, fx + fw, fy + fh,
1497                                         r, g, b, a);
1498                 }
1499         if (util_clip_region(x, y + h - border, border, border,
1500                              rx, ry, rw, rh,
1501                              &fx, &fy, &fw, &fh))
1502                 {
1503                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1504                                         x + border, y + h - border, border,
1505                                         fx, fy, fx + fw, fy + fh,
1506                                         r, g, b, a);
1507                 }
1508         if (util_clip_region(x + w - border, y + h - border, border, border,
1509                              rx, ry, rw, rh,
1510                              &fx, &fy, &fw, &fh))
1511                 {
1512                 pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
1513                                         x + w - border, y + h - border, border,
1514                                         fx, fy, fx + fw, fy + fh,
1515                                         r, g, b, a);
1516                 }
1517 }
1518
1519
1520 /*
1521  *-----------------------------------------------------------------------------
1522  * pixbuf color alterations
1523  *-----------------------------------------------------------------------------
1524  */
1525
1526 void pixbuf_desaturate_rect(GdkPixbuf *pb,
1527                             gint x, gint y, gint w, gint h)
1528 {
1529         gboolean has_alpha;
1530         gint pw;
1531         gint ph;
1532         gint prs;
1533         guchar *p_pix;
1534         guchar *pp;
1535         gint i;
1536         gint j;
1537
1538         if (!pb) return;
1539
1540         pw = gdk_pixbuf_get_width(pb);
1541         ph = gdk_pixbuf_get_height(pb);
1542
1543         if (x < 0 || x + w > pw) return;
1544         if (y < 0 || y + h > ph) return;
1545
1546         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1547         prs = gdk_pixbuf_get_rowstride(pb);
1548         p_pix = gdk_pixbuf_get_pixels(pb);
1549
1550         const gint p_step = has_alpha ? 4 : 3;
1551
1552         for (i = 0; i < h; i++)
1553                 {
1554                 pp = p_pix + (y + i) * prs + (x * p_step);
1555                 for (j = 0; j < w; j++)
1556                         {
1557                         guint8 grey;
1558
1559                         grey = (pp[0] + pp[1] + pp[2]) / 3;
1560                         pp[0] = grey;
1561                         pp[1] = grey;
1562                         pp[2] = grey;
1563                         pp += p_step;
1564                         }
1565                 }
1566 }
1567
1568 /*
1569  *-----------------------------------------------------------------------------
1570  * pixbuf highlight under/over exposure *-----------------------------------------------------------------------------
1571  */
1572 void pixbuf_highlight_overunderexposed(GdkPixbuf *pb, gint x, gint y, gint w, gint h)
1573 {
1574         gboolean has_alpha;
1575         gint pw;
1576         gint ph;
1577         gint prs;
1578         guchar *p_pix;
1579         guchar *pp;
1580         gint i;
1581         gint j;
1582
1583         if (!pb) return;
1584
1585         pw = gdk_pixbuf_get_width(pb);
1586         ph = gdk_pixbuf_get_height(pb);
1587
1588         if (x < 0 || x + w > pw) return;
1589         if (y < 0 || y + h > ph) return;
1590
1591         has_alpha = gdk_pixbuf_get_has_alpha(pb);
1592         prs = gdk_pixbuf_get_rowstride(pb);
1593         p_pix = gdk_pixbuf_get_pixels(pb);
1594
1595         const gint p_step = has_alpha ? 4 : 3;
1596
1597         for (i = 0; i < h; i++)
1598                 {
1599                 pp = p_pix + (y + i) * prs + (x * p_step);
1600                 for (j = 0; j < w; j++)
1601                         {
1602                         if (pp[0] == 255 || pp[1] == 255 || pp[2] == 255 || pp[0] == 0 || pp[1] == 0 || pp[2] == 0)
1603                                 {
1604                                 pp[0] = 255;
1605                                 pp[1] = 0;
1606                                 pp[2] = 0;
1607                                 }
1608                         pp += p_step;
1609                         }
1610                 }
1611 }
1612
1613 /*
1614  *-----------------------------------------------------------------------------
1615  * pixbuf ignore alpha
1616  *-----------------------------------------------------------------------------
1617 */
1618 void pixbuf_ignore_alpha_rect(GdkPixbuf *pb,
1619                  gint x, gint y, gint w, gint h)
1620 {
1621    gboolean has_alpha;
1622    gint pw;
1623    gint ph;
1624    gint prs;
1625    guchar *p_pix;
1626    guchar *pp;
1627    gint i;
1628    gint j;
1629
1630    if (!pb) return;
1631
1632    pw = gdk_pixbuf_get_width(pb);
1633    ph = gdk_pixbuf_get_height(pb);
1634
1635    if (x < 0 || x + w > pw) return;
1636    if (y < 0 || y + h > ph) return;
1637
1638    has_alpha = gdk_pixbuf_get_has_alpha(pb);
1639    if (!has_alpha) return;
1640
1641    prs = gdk_pixbuf_get_rowstride(pb);
1642    p_pix = gdk_pixbuf_get_pixels(pb);
1643
1644    for (i = 0; i < h; i++)
1645        {
1646        pp = p_pix + (y + i) * prs + (x * 4 );
1647        for (j = 0; j < w; j++)
1648            {
1649            pp[3] = 0xff;
1650            pp+=4;
1651            }
1652        }
1653 }
1654 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */