libs/clearlooks-older/support.c

   1 #include "support.h"
   2
   3 /* #define ALWAYS_DITHER_GRADIENTS */
   4
   5 GtkTextDirection
   6 get_direction (GtkWidget *widget)
   7 {
   8         GtkTextDirection dir;
   9
  10         if (widget)
  11                 dir = gtk_widget_get_direction (widget);
  12         else
  13                 dir = GTK_TEXT_DIR_LTR;
  14
  15         return dir;
  16 }
  17
  18 GdkPixbuf *
  19 generate_bit (unsigned char alpha[], GdkColor *color, double mult)
  20 {
  21         guint r, g, b;
  22         GdkPixbuf *pixbuf;
  23         unsigned char *pixels;
  24         int w, h, rs;
  25         int x, y;
  26
  27         r = (color->red >> 8) * mult;
  28         r = MIN(r, 255);
  29         g = (color->green >> 8) * mult;
  30         g = MIN(g, 255);
  31         b = (color->blue >> 8) * mult;
  32         b = MIN(b, 255);
  33
  34         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, RADIO_SIZE, RADIO_SIZE);
  35
  36         w = gdk_pixbuf_get_width (pixbuf);
  37         h = gdk_pixbuf_get_height (pixbuf);
  38         rs = gdk_pixbuf_get_rowstride (pixbuf);
  39         pixels = gdk_pixbuf_get_pixels (pixbuf);
  40
  41
  42         for (y=0; y < h; y++)
  43         {
  44                 for (x=0; x < w; x++)
  45                 {
  46                         pixels[y*rs + x*4 + 0] = r;
  47                         pixels[y*rs + x*4 + 1] = g;
  48                         pixels[y*rs + x*4 + 2] = b;
  49                         if (alpha)
  50                                 pixels[y*rs + x*4 + 3] = alpha[y*w + x];
  51                         else
  52                                 pixels[y*rs + x*4 + 3] = 255;
  53                 }
  54         }
  55
  56         return pixbuf;
  57 }
  58
  59 #define CLAMP_UCHAR(v) ((guchar) (CLAMP (((int)v), (int)0, (int)255)))
  60
  61 GdkPixbuf *
  62 colorize_bit (unsigned char *bit,
  63               unsigned char *alpha,
  64               GdkColor  *new_color)
  65 {
  66         GdkPixbuf *pixbuf;
  67         double intensity;
  68         int x, y;
  69         const guchar *src, *asrc;
  70         guchar *dest;
  71         int dest_rowstride;
  72         int width, height;
  73         guchar *dest_pixels;
  74
  75         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, RADIO_SIZE, RADIO_SIZE);
  76
  77         if (pixbuf == NULL)
  78                 return NULL;
  79
  80         dest_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
  81         width = gdk_pixbuf_get_width (pixbuf);
  82         height = gdk_pixbuf_get_height (pixbuf);
  83         dest_pixels = gdk_pixbuf_get_pixels (pixbuf);
  84
  85         for (y = 0; y < RADIO_SIZE; y++)
  86         {
  87                 src = bit + y * RADIO_SIZE;
  88                 asrc = alpha + y * RADIO_SIZE;
  89                 dest = dest_pixels + y * dest_rowstride;
  90
  91                 for (x = 0; x < RADIO_SIZE; x++)
  92                 {
  93                         double dr, dg, db;
  94
  95                         intensity = (src[x] + 0 )/ 255.0;
  96
  97                         if (intensity <= 0.5)
  98                         {
  99                                 /* Go from black at intensity = 0.0 to new_color at intensity = 0.5 */
 100                                 dr = (new_color->red * intensity * 2.0) / 65535.0;
 101                                 dg = (new_color->green * intensity * 2.0) / 65535.0;
 102                                 db = (new_color->blue * intensity * 2.0) / 65535.0;
 103                         }
 104                         else
 105                         {
 106                                 /* Go from new_color at intensity = 0.5 to white at intensity = 1.0 */
 107                                 dr = (new_color->red + (65535 - new_color->red) * (intensity - 0.5) * 2.0) / 65535.0;
 108                                 dg = (new_color->green + (65535 - new_color->green) * (intensity - 0.5) * 2.0) / 65535.0;
 109                                 db = (new_color->blue + (65535 - new_color->blue) * (intensity - 0.5) * 2.0) / 65535.0;
 110                         }
 111
 112                         dest[0] = CLAMP_UCHAR (255 * dr);
 113                         dest[1] = CLAMP_UCHAR (255 * dg);
 114                         dest[2] = CLAMP_UCHAR (255 * db);
 115
 116                         dest[3] = asrc[x];
 117                         dest += 4;
 118                 }
 119         }
 120
 121         return pixbuf;
 122 }
 123
 124 GdkPixmap *
 125 pixbuf_to_pixmap (GtkStyle  *style,
 126                   GdkPixbuf *pixbuf,
 127                   GdkScreen *screen)
 128 {
 129         GdkGC *tmp_gc;
 130         GdkPixmap *pixmap;
 131
 132         pixmap = gdk_pixmap_new (gdk_screen_get_root_window (screen),
 133                                  gdk_pixbuf_get_width (pixbuf),
 134                                  gdk_pixbuf_get_height (pixbuf),
 135                                  style->depth);
 136
 137         gdk_drawable_set_colormap (pixmap, style->colormap);
 138
 139         tmp_gc = gdk_gc_new (pixmap);
 140
 141         gdk_pixbuf_render_to_drawable (pixbuf, pixmap, tmp_gc, 0, 0, 0, 0,
 142                                        gdk_pixbuf_get_width (pixbuf),
 143                                        gdk_pixbuf_get_height (pixbuf),
 144                                        GDK_RGB_DITHER_NORMAL, 0, 0);
 145
 146         gdk_gc_unref (tmp_gc);
 147
 148         return pixmap;
 149 }
 150
 151
 152 void
 153 rgb_to_hls (gdouble *r,
 154             gdouble *g,
 155             gdouble *b)
 156 {
 157         gdouble min;
 158         gdouble max;
 159         gdouble red;
 160         gdouble green;
 161         gdouble blue;
 162         gdouble h, l, s;
 163         gdouble delta;
 164
 165         red = *r;
 166         green = *g;
 167         blue = *b;
 168
 169         if (red > green)
 170         {
 171                 if (red > blue)
 172                         max = red;
 173                 else
 174                         max = blue;
 175
 176                 if (green < blue)
 177                         min = green;
 178                 else
 179                         min = blue;
 180         }
 181         else
 182         {
 183                 if (green > blue)
 184                         max = green;
 185                 else
 186                         max = blue;
 187
 188                 if (red < blue)
 189                         min = red;
 190                 else
 191                         min = blue;
 192         }
 193
 194         l = (max + min) / 2;
 195         s = 0;
 196         h = 0;
 197
 198         if (max != min)
 199         {
 200                 if (l <= 0.5)
 201                         s = (max - min) / (max + min);
 202                 else
 203                         s = (max - min) / (2 - max - min);
 204
 205                 delta = max -min;
 206                 if (red == max)
 207                         h = (green - blue) / delta;
 208                 else if (green == max)
 209                         h = 2 + (blue - red) / delta;
 210                 else if (blue == max)
 211                         h = 4 + (red - green) / delta;
 212
 213                 h *= 60;
 214                 if (h < 0.0)
 215                         h += 360;
 216         }
 217
 218         *r = h;
 219         *g = l;
 220         *b = s;
 221 }
 222
 223 void
 224 hls_to_rgb (gdouble *h,
 225             gdouble *l,
 226             gdouble *s)
 227 {
 228         gdouble hue;
 229         gdouble lightness;
 230         gdouble saturation;
 231         gdouble m1, m2;
 232         gdouble r, g, b;
 233
 234         lightness = *l;
 235         saturation = *s;
 236
 237         if (lightness <= 0.5)
 238                 m2 = lightness * (1 + saturation);
 239         else
 240                 m2 = lightness + saturation - lightness * saturation;
 241
 242         m1 = 2 * lightness - m2;
 243
 244         if (saturation == 0)
 245         {
 246                 *h = lightness;
 247                 *l = lightness;
 248                 *s = lightness;
 249         }
 250         else
 251         {
 252                 hue = *h + 120;
 253                 while (hue > 360)
 254                         hue -= 360;
 255                 while (hue < 0)
 256                         hue += 360;
 257
 258                 if (hue < 60)
 259                         r = m1 + (m2 - m1) * hue / 60;
 260                 else if (hue < 180)
 261                         r = m2;
 262                 else if (hue < 240)
 263                         r = m1 + (m2 - m1) * (240 - hue) / 60;
 264                 else
 265                         r = m1;
 266
 267                 hue = *h;
 268                 while (hue > 360)
 269                         hue -= 360;
 270                 while (hue < 0)
 271                         hue += 360;
 272
 273                 if (hue < 60)
 274                         g = m1 + (m2 - m1) * hue / 60;
 275                 else if (hue < 180)
 276                         g = m2;
 277                 else if (hue < 240)
 278                         g = m1 + (m2 - m1) * (240 - hue) / 60;
 279                 else
 280                         g = m1;
 281
 282                 hue = *h - 120;
 283                 while (hue > 360)
 284                         hue -= 360;
 285                 while (hue < 0)
 286                         hue += 360;
 287
 288                 if (hue < 60)
 289                         b = m1 + (m2 - m1) * hue / 60;
 290                 else if (hue < 180)
 291                         b = m2;
 292                 else if (hue < 240)
 293                         b = m1 + (m2 - m1) * (240 - hue) / 60;
 294                 else
 295                         b = m1;
 296
 297                 *h = r;
 298                 *l = g;
 299                 *s = b;
 300         }
 301 }
 302
 303 void
 304 shade (GdkColor * a, GdkColor * b, float k)
 305 {
 306         gdouble red;
 307         gdouble green;
 308         gdouble blue;
 309
 310         red = (gdouble) a->red / 65535.0;
 311         green = (gdouble) a->green / 65535.0;
 312         blue = (gdouble) a->blue / 65535.0;
 313
 314         rgb_to_hls (&red, &green, &blue);
 315
 316         green *= k;
 317         if (green > 1.0)
 318                 green = 1.0;
 319         else if (green < 0.0)
 320                 green = 0.0;
 321
 322         blue *= k;
 323         if (blue > 1.0)
 324                 blue = 1.0;
 325         else if (blue < 0.0)
 326                 blue = 0.0;
 327
 328         hls_to_rgb (&red, &green, &blue);
 329
 330         b->red = red * 65535.0;
 331         b->green = green * 65535.0;
 332         b->blue = blue * 65535.0;
 333 }
 334
 335
 336 /**************************************************************************/
 337
 338 void
 339 arrow_draw_hline (GdkWindow     *window,
 340                 GdkGC         *gc,
 341                 int            x1,
 342                 int            x2,
 343                 int            y,
 344                 gboolean       last)
 345 {
 346         if (x2 - x1 < 7 && !last) /* 7 to get garretts pixels, otherwise 6 */
 347         {
 348                 gdk_draw_line (window, gc, x1, y, x2, y);
 349         }
 350         else if (last)
 351         {
 352                 /* we don't draw "spikes" for very small arrows */
 353                 if (x2 - x1 <= 9)
 354                 {
 355                         /*gdk_draw_line (window, gc, x1+1, y, x1+1, y);
 356                         gdk_draw_line (window, gc, x2-1, y, x2-1, y);*/
 357                 }
 358                 else
 359                 {
 360                         gdk_draw_line (window, gc, x1+2, y, x1+2, y);
 361                         gdk_draw_line (window, gc, x2-2, y, x2-2, y);
 362                 }
 363         }
 364         else
 365         {
 366                 gdk_draw_line (window, gc, x1, y, x1+2, y);
 367                 gdk_draw_line (window, gc, x2-2, y, x2, y);
 368         }
 369 }
 370
 371 void
 372 arrow_draw_vline (GdkWindow     *window,
 373                   GdkGC         *gc,
 374                   int            y1,
 375                   int            y2,
 376                   int            x,
 377                   gboolean       last)
 378 {
 379         if (y2 - y1 < 7 && !last) /* 7 to get garretts pixels */
 380                 gdk_draw_line (window, gc, x, y1, x, y2);
 381         else if (last)
 382         {
 383                 /* we don't draw "spikes" for very small arrows */
 384                 if (y2 - y1 > 9) {
 385                         gdk_draw_line (window, gc, x, y1+2, x, y1+2);
 386                         gdk_draw_line (window, gc, x, y2-2, x, y2-2);
 387                 }
 388         }
 389         else
 390         {
 391                 gdk_draw_line (window, gc, x, y1, x, y1+2);
 392                 gdk_draw_line (window, gc, x, y2-2, x, y2);
 393         }
 394 }
 395
 396
 397
 398 void
 399 draw_arrow (GdkWindow     *window,
 400             GdkGC         *gc,
 401             GdkRectangle  *area,
 402             GtkArrowType   arrow_type,
 403             gint           x,
 404             gint           y,
 405             gint           width,
 406             gint           height)
 407 {
 408         gint i, j;
 409
 410         if (area)
 411                 gdk_gc_set_clip_rectangle (gc, area);
 412
 413         if (arrow_type == GTK_ARROW_DOWN)
 414         {
 415                 for (i = 0, j = -1; i < height; i++, j++)
 416                         arrow_draw_hline (window, gc, x + j, x + width - j - 1, y + i, i == 0);
 417
 418         }
 419         else if (arrow_type == GTK_ARROW_UP)
 420         {
 421                 for (i = height - 1, j = -1; i >= 0; i--, j++)
 422                         arrow_draw_hline (window, gc, x + j, x + width - j - 1, y + i, i == height - 1);
 423         }
 424         else if (arrow_type == GTK_ARROW_LEFT)
 425         {
 426                 for (i = width - 1, j = -1; i >= 0; i--, j++)
 427                         arrow_draw_vline (window, gc, y + j, y + height - j - 1, x + i, i == width - 1);
 428         }
 429         else if (arrow_type == GTK_ARROW_RIGHT)
 430         {
 431                 for (i = 0, j = -1; i < width; i++, j++)
 432                         arrow_draw_vline (window, gc, y + j, y + height - j - 1,  x + i, i == 0);
 433         }
 434
 435         if (area)
 436                 gdk_gc_set_clip_rectangle (gc, NULL);
 437 }
 438
 439 void
 440 calculate_arrow_geometry (GtkArrowType  arrow_type,
 441                           gint         *x,
 442                           gint         *y,
 443                           gint         *width,
 444                           gint         *height)
 445 {
 446         gint w = *width;
 447         gint h = *height;
 448
 449         switch (arrow_type)
 450         {
 451                 case GTK_ARROW_UP:
 452                 case GTK_ARROW_DOWN:
 453                         w += (w % 2) - 1;
 454                         h = (w / 2 + 1) + 1;
 455
 456                         if (h > *height)
 457                         {
 458                                 h = *height;
 459                                 w = 2 * (h - 1) - 1;
 460                         }
 461
 462                         if (arrow_type == GTK_ARROW_DOWN)
 463                         {
 464                                 if (*height % 2 == 1 || h % 2 == 0)
 465                                         *height += 1;
 466                         }
 467                         else
 468                         {
 469                                 if (*height % 2 == 0 || h % 2 == 0)
 470                                         *height -= 1;
 471                         }
 472                         break;
 473
 474                 case GTK_ARROW_RIGHT:
 475                 case GTK_ARROW_LEFT:
 476                         h += (h % 2) - 1;
 477                         w = (h / 2 + 1) + 1;
 478
 479                         if (w > *width)
 480                         {
 481                                 w = *width;
 482                                 h = 2 * (w - 1) - 1;
 483                         }
 484
 485                         if (arrow_type == GTK_ARROW_RIGHT)
 486                         {
 487                                 if (*width % 2 == 1 || w % 2 == 0)
 488                                         *width += 1;
 489                         }
 490                         else
 491                         {
 492                                 if (*width % 2 == 0 || w % 2 == 0)
 493                                         *width -= 1;
 494                         }
 495                         break;
 496
 497                 default:
 498                         /* should not be reached */
 499                         break;
 500         }
 501
 502         *x += (*width - w) / 2;
 503         *y += (*height - h) / 2;
 504         *height = h;
 505         *width = w;
 506 }
 507
 508
 509 void gtk_treeview_get_header_index (GtkTreeView *tv, GtkWidget *header,
 510                                            gint *column_index, gint *columns,
 511 gboolean *resizable)
 512 {
 513         GList *list;
 514         *column_index = *columns = 0;
 515         list = gtk_tree_view_get_columns (tv);
 516
 517         do
 518         {
 519                 GtkTreeViewColumn *column = GTK_TREE_VIEW_COLUMN(list->data);
 520                 if ( column->button == header )
 521                 {
 522                         *column_index = *columns;
 523                         *resizable = column->resizable;
 524                 }
 525                 if ( column->visible )
 526                         (*columns)++;
 527         } while ((list = g_list_next(list)));
 528 }
 529
 530 void gtk_clist_get_header_index (GtkCList *clist, GtkWidget *button,
 531                                  gint *column_index, gint *columns)
 532 {
 533         *columns = clist->columns;
 534         int i;
 535
 536         for (i=0; i<*columns; i++)
 537         {
 538                 if (clist->column[i].button == button)
 539                 {
 540                         *column_index = i;
 541                         break;
 542                 }
 543         }
 544 }
 545
 546 gboolean
 547 sanitize_size (GdkWindow      *window,
 548                gint           *width,
 549                gint           *height)
 550 {
 551         gboolean set_bg = FALSE;
 552
 553         if ((*width == -1) && (*height == -1))
 554         {
 555                 set_bg = GDK_IS_WINDOW (window);
 556                 gdk_window_get_size (window, width, height);
 557         }
 558         else if (*width == -1)
 559                 gdk_window_get_size (window, width, NULL);
 560         else if (*height == -1)
 561                 gdk_window_get_size (window, NULL, height);
 562
 563         return set_bg;
 564 }
 565
 566 static GtkRequisition default_option_indicator_size = { 7, 13 };
 567 static GtkBorder default_option_indicator_spacing = { 7, 5, 2, 2 };
 568
 569 void
 570 option_menu_get_props (GtkWidget      *widget,
 571                        GtkRequisition *indicator_size,
 572                        GtkBorder      *indicator_spacing)
 573 {
 574         GtkRequisition *tmp_size = NULL;
 575         GtkBorder *tmp_spacing = NULL;
 576
 577         if (widget)
 578                 gtk_widget_style_get (widget, "indicator_size", &tmp_size,
 579                                       "indicator_spacing", &tmp_spacing, NULL);
 580
 581         if (tmp_size)
 582         {
 583                 *indicator_size = *tmp_size;
 584                 g_free (tmp_size);
 585         }
 586         else
 587                 *indicator_size = default_option_indicator_size;
 588
 589         if (tmp_spacing)
 590         {
 591                 *indicator_spacing = *tmp_spacing;
 592                 g_free (tmp_spacing);
 593         }
 594         else
 595                 *indicator_spacing = default_option_indicator_spacing;
 596 }
 597
 598 GtkWidget *special_get_ancestor(GtkWidget * widget,
 599                                        GType widget_type)
 600 {
 601         g_return_val_if_fail(GTK_IS_WIDGET(widget), NULL);
 602
 603         while (widget && widget->parent
 604                && !g_type_is_a(GTK_WIDGET_TYPE(widget->parent),
 605                                widget_type))
 606                 widget = widget->parent;
 607
 608         if (!
 609             (widget && widget->parent
 610              && g_type_is_a(GTK_WIDGET_TYPE(widget->parent), widget_type)))
 611                 return NULL;
 612
 613         return widget;
 614 }
 615
 616 /* Dithered Gradient Buffers */
 617 static void
 618 internel_image_buffer_free_pixels (guchar *pixels, gpointer data)
 619 {
 620         g_free (pixels);
 621 }
 622
 623 static GdkPixbuf*
 624 internal_image_buffer_new (gint width, gint height)
 625 {
 626         guchar *buf;
 627         int rowstride;
 628
 629         g_return_val_if_fail (width > 0, NULL);
 630         g_return_val_if_fail (height > 0, NULL);
 631
 632         rowstride = width * 3;
 633
 634         buf = g_try_malloc (height * rowstride);
 635
 636         if (!buf)
 637                 return NULL;
 638
 639         return gdk_pixbuf_new_from_data(buf, GDK_COLORSPACE_RGB,
 640                                         FALSE, 8,
 641                                         width, height, rowstride,
 642                                         internel_image_buffer_free_pixels, NULL);
 643 }
 644
 645 static void
 646 internal_color_get_as_uchars(GdkColor *color,
 647                                 guchar *red,
 648                                 guchar *green,
 649                                 guchar *blue)
 650 {
 651         *red = (guchar) (color->red / 256.0);
 652         *green = (guchar) (color->green / 256.0);
 653         *blue = (guchar) (color->blue / 256.0);
 654 }
 655
 656 static GdkPixbuf*
 657 internal_create_horizontal_gradient_image_buffer (gint width, gint height,
 658                                                         GdkColor *from,
 659                                                         GdkColor *to)
 660 {
 661         int i;
 662         long r, g, b, dr, dg, db;
 663         GdkPixbuf* buffer;
 664         guchar *ptr;
 665         guchar *pixels;
 666         guchar r0, g0, b0;
 667         guchar rf, gf, bf;
 668         int rowstride;
 669
 670         buffer = internal_image_buffer_new (width, height);
 671
 672         if (buffer == NULL)
 673                 return NULL;
 674
 675         pixels = gdk_pixbuf_get_pixels (buffer);
 676         ptr = pixels;
 677         rowstride = gdk_pixbuf_get_rowstride (buffer);
 678
 679         internal_color_get_as_uchars(from, &r0, &g0, &b0);
 680         internal_color_get_as_uchars(to, &rf, &gf, &bf);
 681
 682         r = r0 << 16;
 683         g = g0 << 16;
 684         b = b0 << 16;
 685
 686         dr = ((rf-r0)<<16)/width;
 687         dg = ((gf-g0)<<16)/width;
 688         db = ((bf-b0)<<16)/width;
 689
 690         /* render the first line */
 691         for (i=0; i<width; i++)
 692         {
 693                 *(ptr++) = (guchar)(r>>16);
 694                 *(ptr++) = (guchar)(g>>16);
 695                 *(ptr++) = (guchar)(b>>16);
 696
 697                 r += dr;
 698                 g += dg;
 699                 b += db;
 700         }
 701
 702         /* copy the first line to the other lines */
 703         for (i=1; i<height; i++)
 704         {
 705                 memcpy (&(pixels[i*rowstride]), pixels, rowstride);
 706         }
 707
 708         return buffer;
 709 }
 710
 711 static GdkPixbuf*
 712 internal_create_vertical_gradient_image_buffer (gint width, gint height,
 713                                                 GdkColor *from,
 714                                                 GdkColor *to)
 715 {
 716         gint i, j, max_block, last_block;
 717         long r, g, b, dr, dg, db;
 718         GdkPixbuf *buffer;
 719
 720         guchar *ptr;
 721         guchar point[4];
 722
 723         guchar r0, g0, b0;
 724         guchar rf, gf, bf;
 725
 726         gint rowstride;
 727         guchar *pixels;
 728
 729         buffer = internal_image_buffer_new (width, height);
 730
 731         if (buffer == NULL)
 732                 return NULL;
 733
 734         pixels = gdk_pixbuf_get_pixels (buffer);
 735         rowstride = gdk_pixbuf_get_rowstride (buffer);
 736
 737         internal_color_get_as_uchars(from, &r0, &g0, &b0);
 738         internal_color_get_as_uchars(to, &rf, &gf, &bf);
 739
 740         r = r0<<16;
 741         g = g0<<16;
 742         b = b0<<16;
 743
 744         dr = ((rf-r0)<<16)/height;
 745         dg = ((gf-g0)<<16)/height;
 746         db = ((bf-b0)<<16)/height;
 747
 748         max_block = width/2;
 749
 750         for (i=0; i < height; i++)
 751         {
 752                 ptr = pixels + i * rowstride;
 753
 754                 ptr[0] = r>>16;
 755                 ptr[1] = g>>16;
 756                 ptr[2] = b>>16;
 757
 758                 if (width > 1)
 759                 {
 760                         last_block = 0;
 761
 762                         for (j=1; j <= max_block; j *= 2)
 763                         {
 764                                 memcpy (&(ptr[j*3]), ptr, j*3);
 765
 766                                 if ((j*2) >= max_block)
 767                                 {
 768                                         last_block = j*2;
 769                                 }
 770                         }
 771
 772                         if ((last_block < width) && (last_block > 0))
 773                         {
 774                                 memcpy (&(ptr[last_block*3]), ptr, (width - last_block)*3);
 775                         }
 776                 }
 777
 778                 r += dr;
 779                 g += dg;
 780                 b += db;
 781         }
 782
 783         return buffer;
 784 }
 785
 786 void
 787 draw_vgradient (GdkDrawable *drawable, GdkGC *gc, GtkStyle *style,
 788                 int x, int y, int width, int height,
 789                 GdkColor *left_color, GdkColor *right_color)
 790 {
 791         #ifndef ALWAYS_DITHER_GRADIENTS
 792         gboolean dither = ((style->depth > 0) && (style->depth <= 16));
 793         #endif
 794
 795         if ((width <= 0) || (height <= 0))
 796                 return;
 797
 798         if ( left_color == NULL || right_color == NULL )
 799         {
 800                 gdk_draw_rectangle (drawable, gc, TRUE, x, y, width, height);
 801                 return;
 802         }
 803
 804         #ifndef ALWAYS_DITHER_GRADIENTS
 805         if (dither)
 806         #endif
 807         {
 808                 GdkPixbuf *image_buffer = NULL;
 809
 810                 image_buffer = internal_create_horizontal_gradient_image_buffer (width, height, left_color, right_color);
 811
 812                 if (image_buffer)
 813                 {
 814                         gdk_draw_pixbuf(drawable, gc, image_buffer, 0, 0, x, y, width, height, GDK_RGB_DITHER_MAX, 0, 0);
 815
 816                         g_object_unref(image_buffer);
 817                 }
 818         }
 819         #ifndef ALWAYS_DITHER_GRADIENTS
 820         else
 821         {
 822                 int i;
 823                 GdkColor col;
 824                 int dr, dg, db;
 825                 GdkGCValues old_values;
 826
 827                 gdk_gc_get_values (gc, &old_values);
 828
 829                 if (left_color == right_color )
 830                 {
 831                         col = *left_color;
 832                         gdk_rgb_find_color (style->colormap, &col);
 833                         gdk_gc_set_foreground (gc, &col);
 834                         gdk_draw_rectangle (drawable, gc, TRUE, x, y, width, height);
 835                         gdk_gc_set_foreground (gc, &old_values.foreground);
 836                         return;
 837                 }
 838
 839                 col = *left_color;
 840                 dr = (right_color->red - left_color->red) / width;
 841                 dg = (right_color->green - left_color->green) / width;
 842                 db = (right_color->blue - left_color->blue) / width;
 843
 844                 for (i = 0; i < width; i++)
 845                 {
 846                         gdk_rgb_find_color (style->colormap, &col);
 847
 848                         gdk_gc_set_foreground (gc, &col);
 849                         gdk_draw_line (drawable, gc, x + i, y, x + i, y + height - 1);
 850
 851                         col.red += dr;
 852                         col.green += dg;
 853                         col.blue += db;
 854                 }
 855
 856                 gdk_gc_set_foreground (gc, &old_values.foreground);
 857         }
 858         #endif
 859 }
 860
 861 void
 862 draw_hgradient (GdkDrawable *drawable, GdkGC *gc, GtkStyle *style,
 863                 int x, int y, int width, int height,
 864                 GdkColor *top_color, GdkColor *bottom_color)
 865 {
 866         #ifndef ALWAYS_DITHER_GRADIENTS
 867         gboolean dither = ((style->depth > 0) && (style->depth <= 16));
 868         #endif
 869
 870         if ((width <= 0) || (height <= 0))
 871                 return;
 872
 873         #ifndef ALWAYS_DITHER_GRADIENTS
 874         if (dither)
 875         #endif
 876         {
 877                 GdkPixbuf *image_buffer = NULL;
 878
 879                 image_buffer = internal_create_vertical_gradient_image_buffer (width, height, top_color, bottom_color);
 880
 881                 if (image_buffer)
 882                 {
 883                         gdk_draw_pixbuf(drawable, gc, image_buffer, 0, 0, x, y, width, height, GDK_RGB_DITHER_MAX, 0, 0);
 884
 885                         g_object_unref(image_buffer);
 886                 }
 887         }
 888         #ifndef ALWAYS_DITHER_GRADIENTS
 889         else
 890         {
 891                 int i;
 892                 GdkColor col;
 893                 int dr, dg, db;
 894                 GdkGCValues old_values;
 895
 896                 gdk_gc_get_values (gc, &old_values);
 897
 898                 if (top_color == bottom_color )
 899                 {
 900                                 col = *top_color;
 901                                 gdk_rgb_find_color (style->colormap, &col);
 902                                 gdk_gc_set_foreground (gc, &col);
 903                                 gdk_draw_rectangle (drawable, gc, TRUE, x, y, width, height);
 904                                 gdk_gc_set_foreground (gc, &old_values.foreground);
 905                                 return;
 906                 }
 907
 908                 col = *top_color;
 909                 dr = (bottom_color->red - top_color->red) / height;
 910                 dg = (bottom_color->green - top_color->green) / height;
 911                 db = (bottom_color->blue - top_color->blue) / height;
 912
 913                 for (i = 0; i < height; i++)
 914                 {
 915                         gdk_rgb_find_color (style->colormap, &col);
 916
 917                         gdk_gc_set_foreground (gc, &col);
 918                         gdk_draw_line (drawable, gc, x, y + i, x + width - 1, y + i);
 919
 920                         col.red += dr;
 921                         col.green += dg;
 922                         col.blue += db;
 923                 }
 924
 925                 gdk_gc_set_foreground (gc, &old_values.foreground);
 926         }
 927         #endif
 928 }
 929
 930 void blend (GdkColormap *colormap,
 931                        GdkColor *a, GdkColor *b, GdkColor *c, int alpha)
 932 {
 933         int inAlpha = 100-alpha;
 934         c->red   = (a->red   * alpha + b->red   * inAlpha) / 100;
 935         c->green = (a->green * alpha + b->green * inAlpha) / 100;
 936         c->blue  = (a->blue  * alpha + b->blue  * inAlpha) / 100;
 937
 938         gdk_rgb_find_color (colormap, c);
 939 }
 940
 941 GtkWidget *get_parent_window (GtkWidget *widget)
 942 {
 943         GtkWidget *parent = widget->parent;
 944
 945         while (parent && GTK_WIDGET_NO_WINDOW (parent))
 946                 parent = parent->parent;
 947
 948         return parent;
 949 }
 950
 951 GdkColor *get_parent_bgcolor (GtkWidget *widget)
 952 {
 953         GtkWidget *parent = get_parent_window (widget);
 954
 955         if (parent && parent->style)
 956                 return &parent->style->bg[GTK_STATE_NORMAL];
 957
 958         return NULL;
 959 }
 960
 961 GtkWidget *
 962 find_combo_box_widget (GtkWidget * widget)
 963 {
 964         GtkWidget *result = NULL;
 965
 966         if (widget && !GTK_IS_COMBO_BOX_ENTRY (widget))
 967         {
 968                 if (GTK_IS_COMBO_BOX (widget))
 969                         result = widget;
 970                 else
 971                         result = find_combo_box_widget(widget->parent);
 972         }
 973
 974         return result;
 975 }
 976
 977 gboolean
 978 is_combo_box (GtkWidget * widget)
 979 {
 980         return (find_combo_box_widget(widget) != NULL);
 981 }