src/pixbuf_util.c

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