src/widgets/sp-color-slider.cpp

   1 #define __SP_COLOR_SLIDER_C__
   2
   3 /*
   4  * A slider with colored background
   5  *
   6  * Author:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * Copyright (C) 2001-2002 Lauris Kaplinski
  11  *
  12  * This code is in public domain
  13  */
  14
  15 #include <gtk/gtkversion.h>
  16 #include <gtk/gtksignal.h>
  17 #include "sp-color-scales.h"
  18 #include "preferences.h"
  19
  20 #define SLIDER_WIDTH 96
  21 #define SLIDER_HEIGHT 8
  22 #define ARROW_SIZE 7
  23
  24 enum {
  25         GRABBED,
  26         DRAGGED,
  27         RELEASED,
  28         CHANGED,
  29         LAST_SIGNAL
  30 };
  31
  32 static void sp_color_slider_class_init (SPColorSliderClass *klass);
  33 static void sp_color_slider_init (SPColorSlider *slider);
  34 static void sp_color_slider_destroy (GtkObject *object);
  35
  36 static void sp_color_slider_realize (GtkWidget *widget);
  37 static void sp_color_slider_size_request (GtkWidget *widget, GtkRequisition *requisition);
  38 static void sp_color_slider_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
  39 /*  static void sp_color_slider_draw (GtkWidget *widget, GdkRectangle *area); */
  40 /*  static void sp_color_slider_draw_focus (GtkWidget *widget); */
  41 /*  static void sp_color_slider_draw_default (GtkWidget *widget); */
  42
  43 static gint sp_color_slider_expose (GtkWidget *widget, GdkEventExpose *event);
  44 static gint sp_color_slider_button_press (GtkWidget *widget, GdkEventButton *event);
  45 static gint sp_color_slider_button_release (GtkWidget *widget, GdkEventButton *event);
  46 static gint sp_color_slider_motion_notify (GtkWidget *widget, GdkEventMotion *event);
  47
  48 static void sp_color_slider_adjustment_changed (GtkAdjustment *adjustment, SPColorSlider *slider);
  49 static void sp_color_slider_adjustment_value_changed (GtkAdjustment *adjustment, SPColorSlider *slider);
  50
  51 static void sp_color_slider_paint (SPColorSlider *slider, GdkRectangle *area);
  52 static const guchar *sp_color_slider_render_gradient (gint x0, gint y0, gint width, gint height,
  53                                                       gint c[], gint dc[], guint b0, guint b1, guint mask);
  54 static const guchar *sp_color_slider_render_map (gint x0, gint y0, gint width, gint height,
  55                                                  guchar *map, gint start, gint step, guint b0, guint b1, guint mask);
  56
  57 static GtkWidgetClass *parent_class;
  58 static guint slider_signals[LAST_SIGNAL] = {0};
  59
  60 GtkType
  61 sp_color_slider_get_type (void)
  62 {
  63     //TODO: switch to GObject
  64     // GtkType and such calls were deprecated a while back with the
  65     // introduction of GObject as a separate layer, with GType instead. --JonCruz
  66
  67         static GtkType type = 0;
  68         if (!type) {
  69                 GtkTypeInfo info = {
  70                         (gchar*) "SPColorSlider",
  71                         sizeof (SPColorSlider),
  72                         sizeof (SPColorSliderClass),
  73                         (GtkClassInitFunc) sp_color_slider_class_init,
  74                         (GtkObjectInitFunc) sp_color_slider_init,
  75                         NULL, NULL, NULL
  76                 };
  77                 type = gtk_type_unique (GTK_TYPE_WIDGET, &info);
  78         }
  79         return type;
  80 }
  81
  82 static void
  83 sp_color_slider_class_init (SPColorSliderClass *klass)
  84 {
  85         GtkObjectClass *object_class;
  86         GtkWidgetClass *widget_class;
  87
  88         object_class = (GtkObjectClass *) klass;
  89         widget_class = (GtkWidgetClass *) klass;
  90
  91         parent_class = (GtkWidgetClass*)gtk_type_class (GTK_TYPE_WIDGET);
  92
  93         slider_signals[GRABBED] = gtk_signal_new ("grabbed",
  94                                                   (GtkSignalRunType)(GTK_RUN_FIRST | GTK_RUN_NO_RECURSE),
  95                                                   GTK_CLASS_TYPE(object_class),
  96                                                   GTK_SIGNAL_OFFSET (SPColorSliderClass, grabbed),
  97                                                   gtk_marshal_NONE__NONE,
  98                                                   GTK_TYPE_NONE, 0);
  99         slider_signals[DRAGGED] = gtk_signal_new ("dragged",
 100                                                   (GtkSignalRunType)(GTK_RUN_FIRST | GTK_RUN_NO_RECURSE),
 101                                                   GTK_CLASS_TYPE(object_class),
 102                                                   GTK_SIGNAL_OFFSET (SPColorSliderClass, dragged),
 103                                                   gtk_marshal_NONE__NONE,
 104                                                   GTK_TYPE_NONE, 0);
 105         slider_signals[RELEASED] = gtk_signal_new ("released",
 106                                                   (GtkSignalRunType)(GTK_RUN_FIRST | GTK_RUN_NO_RECURSE),
 107                                                   GTK_CLASS_TYPE(object_class),
 108                                                   GTK_SIGNAL_OFFSET (SPColorSliderClass, released),
 109                                                   gtk_marshal_NONE__NONE,
 110                                                   GTK_TYPE_NONE, 0);
 111         slider_signals[CHANGED] = gtk_signal_new ("changed",
 112                                                   (GtkSignalRunType)(GTK_RUN_FIRST | GTK_RUN_NO_RECURSE),
 113                                                   GTK_CLASS_TYPE(object_class),
 114                                                   GTK_SIGNAL_OFFSET (SPColorSliderClass, changed),
 115                                                   gtk_marshal_NONE__NONE,
 116                                                   GTK_TYPE_NONE, 0);
 117
 118         object_class->destroy = sp_color_slider_destroy;
 119
 120         widget_class->realize = sp_color_slider_realize;
 121         widget_class->size_request = sp_color_slider_size_request;
 122         widget_class->size_allocate = sp_color_slider_size_allocate;
 123 /*      widget_class->draw = sp_color_slider_draw; */
 124 /*      widget_class->draw_focus = sp_color_slider_draw_focus; */
 125 /*      widget_class->draw_default = sp_color_slider_draw_default; */
 126
 127         widget_class->expose_event = sp_color_slider_expose;
 128         widget_class->button_press_event = sp_color_slider_button_press;
 129         widget_class->button_release_event = sp_color_slider_button_release;
 130         widget_class->motion_notify_event = sp_color_slider_motion_notify;
 131 }
 132
 133 static void
 134 sp_color_slider_init (SPColorSlider *slider)
 135 {
 136         /* We are widget with window */
 137         GTK_WIDGET_UNSET_FLAGS (slider, GTK_NO_WINDOW);
 138
 139         slider->dragging = FALSE;
 140
 141         slider->adjustment = NULL;
 142         slider->value = 0.0;
 143
 144         slider->c0[0] = 0x00;
 145         slider->c0[1] = 0x00;
 146         slider->c0[2] = 0x00;
 147         slider->c0[3] = 0xff;
 148
 149         slider->cm[0] = 0xff;
 150         slider->cm[1] = 0x00;
 151         slider->cm[2] = 0x00;
 152         slider->cm[3] = 0xff;
 153
 154         slider->c1[0] = 0xff;
 155         slider->c1[1] = 0xff;
 156         slider->c1[2] = 0xff;
 157         slider->c1[3] = 0xff;
 158
 159         slider->b0 = 0x5f;
 160         slider->b1 = 0xa0;
 161         slider->bmask = 0x08;
 162
 163         slider->map = NULL;
 164 }
 165
 166 static void
 167 sp_color_slider_destroy (GtkObject *object)
 168 {
 169         SPColorSlider *slider;
 170
 171         slider = SP_COLOR_SLIDER (object);
 172
 173         if (slider->adjustment) {
 174                 gtk_signal_disconnect_by_data (GTK_OBJECT (slider->adjustment), slider);
 175                 gtk_object_unref (GTK_OBJECT (slider->adjustment));
 176                 slider->adjustment = NULL;
 177         }
 178
 179         if (((GtkObjectClass *) (parent_class))->destroy)
 180                 (* ((GtkObjectClass *) (parent_class))->destroy) (object);
 181 }
 182
 183 static void
 184 sp_color_slider_realize (GtkWidget *widget)
 185 {
 186         SPColorSlider *slider;
 187         GdkWindowAttr attributes;
 188         gint attributes_mask;
 189
 190         slider = SP_COLOR_SLIDER (widget);
 191
 192         GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 193
 194         attributes.window_type = GDK_WINDOW_CHILD;
 195         attributes.x = widget->allocation.x;
 196         attributes.y = widget->allocation.y;
 197         attributes.width = widget->allocation.width;
 198         attributes.height = widget->allocation.height;
 199         attributes.wclass = GDK_INPUT_OUTPUT;
 200         attributes.visual = gdk_rgb_get_visual ();
 201         attributes.colormap = gdk_rgb_get_cmap ();
 202         attributes.event_mask = gtk_widget_get_events (widget);
 203         attributes.event_mask |= (GDK_EXPOSURE_MASK |
 204                                   GDK_BUTTON_PRESS_MASK |
 205                                   GDK_BUTTON_RELEASE_MASK |
 206                                   GDK_POINTER_MOTION_MASK |
 207                                   GDK_ENTER_NOTIFY_MASK |
 208                                   GDK_LEAVE_NOTIFY_MASK);
 209         attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 210
 211         widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
 212         gdk_window_set_user_data (widget->window, widget);
 213
 214         widget->style = gtk_style_attach (widget->style, widget->window);
 215 }
 216
 217 static void
 218 sp_color_slider_size_request (GtkWidget *widget, GtkRequisition *requisition)
 219 {
 220         SPColorSlider *slider;
 221
 222         slider = SP_COLOR_SLIDER (widget);
 223
 224         requisition->width = SLIDER_WIDTH + widget->style->xthickness * 2;
 225         requisition->height = SLIDER_HEIGHT + widget->style->ythickness * 2;
 226 }
 227
 228 static void
 229 sp_color_slider_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
 230 {
 231         SPColorSlider *slider;
 232
 233         slider = SP_COLOR_SLIDER (widget);
 234
 235         widget->allocation = *allocation;
 236
 237         if (GTK_WIDGET_REALIZED (widget)) {
 238                 /* Resize GdkWindow */
 239                 gdk_window_move_resize (widget->window, allocation->x, allocation->y, allocation->width, allocation->height);
 240         }
 241 }
 242
 243 static gint
 244 sp_color_slider_expose (GtkWidget *widget, GdkEventExpose *event)
 245 {
 246         SPColorSlider *slider;
 247
 248         slider = SP_COLOR_SLIDER (widget);
 249
 250         if (GTK_WIDGET_DRAWABLE (widget)) {
 251                 gint width, height;
 252                 width = widget->allocation.width;
 253                 height = widget->allocation.height;
 254                 sp_color_slider_paint (slider, &event->area);
 255         }
 256
 257         return FALSE;
 258 }
 259
 260 static gint
 261 sp_color_slider_button_press (GtkWidget *widget, GdkEventButton *event)
 262 {
 263         SPColorSlider *slider;
 264
 265         slider = SP_COLOR_SLIDER (widget);
 266
 267         if (event->button == 1) {
 268                 gint cx, cw;
 269                 cx = widget->style->xthickness;
 270                 cw = widget->allocation.width - 2 * cx;
 271                 gtk_signal_emit (GTK_OBJECT (slider), slider_signals[GRABBED]);
 272                 slider->dragging = TRUE;
 273                 slider->oldvalue = slider->value;
 274                 ColorScales::setScaled( slider->adjustment, CLAMP ((gfloat) (event->x - cx) / cw, 0.0, 1.0) );
 275                 gtk_signal_emit (GTK_OBJECT (slider), slider_signals[DRAGGED]);
 276                 gdk_pointer_grab (widget->window, FALSE,
 277                                   (GdkEventMask)(GDK_POINTER_MOTION_MASK |
 278                                   GDK_BUTTON_RELEASE_MASK),
 279                                   NULL, NULL, event->time);
 280         }
 281
 282         return FALSE;
 283 }
 284
 285 static gint
 286 sp_color_slider_button_release (GtkWidget *widget, GdkEventButton *event)
 287 {
 288         SPColorSlider *slider;
 289
 290         slider = SP_COLOR_SLIDER (widget);
 291
 292         if (event->button == 1) {
 293                 gdk_pointer_ungrab (event->time);
 294                 slider->dragging = FALSE;
 295                 gtk_signal_emit (GTK_OBJECT (slider), slider_signals[RELEASED]);
 296                 if (slider->value != slider->oldvalue) gtk_signal_emit (GTK_OBJECT (slider), slider_signals[CHANGED]);
 297         }
 298
 299         return FALSE;
 300 }
 301
 302 static gint
 303 sp_color_slider_motion_notify (GtkWidget *widget, GdkEventMotion *event)
 304 {
 305         SPColorSlider *slider;
 306
 307         slider = SP_COLOR_SLIDER (widget);
 308
 309         if (slider->dragging) {
 310                 gint cx, cw;
 311                 cx = widget->style->xthickness;
 312                 cw = widget->allocation.width - 2 * cx;
 313                 ColorScales::setScaled( slider->adjustment, CLAMP ((gfloat) (event->x - cx) / cw, 0.0, 1.0) );
 314                 gtk_signal_emit (GTK_OBJECT (slider), slider_signals[DRAGGED]);
 315         }
 316
 317         return FALSE;
 318 }
 319
 320 GtkWidget *
 321 sp_color_slider_new (GtkAdjustment *adjustment)
 322 {
 323         SPColorSlider *slider;
 324
 325         slider = (SPColorSlider*)gtk_type_new (SP_TYPE_COLOR_SLIDER);
 326
 327         sp_color_slider_set_adjustment (slider, adjustment);
 328
 329         return GTK_WIDGET (slider);
 330 }
 331
 332 void
 333 sp_color_slider_set_adjustment (SPColorSlider *slider, GtkAdjustment *adjustment)
 334 {
 335         g_return_if_fail (slider != NULL);
 336         g_return_if_fail (SP_IS_COLOR_SLIDER (slider));
 337
 338         if (!adjustment) {
 339                 adjustment = (GtkAdjustment *) gtk_adjustment_new (0.0, 0.0, 1.0, 0.01, 0.0, 0.0);
 340         }
 341 #if GTK_CHECK_VERSION (2,14,0)
 342     else {
 343         gtk_adjustment_set_page_increment(adjustment, 0.0);
 344         gtk_adjustment_set_page_size(adjustment, 0.0);
 345     }
 346 #endif
 347
 348         if (slider->adjustment != adjustment) {
 349                 if (slider->adjustment) {
 350                         gtk_signal_disconnect_by_data (GTK_OBJECT (slider->adjustment), slider);
 351                         gtk_object_unref (GTK_OBJECT (slider->adjustment));
 352                 }
 353
 354                 slider->adjustment = adjustment;
 355                 gtk_object_ref (GTK_OBJECT (adjustment));
 356                 gtk_object_sink (GTK_OBJECT (adjustment));
 357
 358                 gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
 359                                     GTK_SIGNAL_FUNC (sp_color_slider_adjustment_changed), slider);
 360                 gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
 361                                     GTK_SIGNAL_FUNC (sp_color_slider_adjustment_value_changed), slider);
 362
 363                 slider->value = ColorScales::getScaled( adjustment );
 364
 365                 sp_color_slider_adjustment_changed (adjustment, slider);
 366         }
 367 }
 368
 369 void
 370 sp_color_slider_set_colors (SPColorSlider *slider, guint32 start, guint32 mid, guint32 end)
 371 {
 372         g_return_if_fail (slider != NULL);
 373         g_return_if_fail (SP_IS_COLOR_SLIDER (slider));
 374
 375         // Remove any map, if set
 376         slider->map = 0;
 377
 378         slider->c0[0] = start >> 24;
 379         slider->c0[1] = (start >> 16) & 0xff;
 380         slider->c0[2] = (start >> 8) & 0xff;
 381         slider->c0[3] = start & 0xff;
 382
 383         slider->cm[0] = mid >> 24;
 384         slider->cm[1] = (mid >> 16) & 0xff;
 385         slider->cm[2] = (mid >> 8) & 0xff;
 386         slider->cm[3] = mid & 0xff;
 387
 388         slider->c1[0] = end >> 24;
 389         slider->c1[1] = (end >> 16) & 0xff;
 390         slider->c1[2] = (end >> 8) & 0xff;
 391         slider->c1[3] = end & 0xff;
 392
 393         gtk_widget_queue_draw (GTK_WIDGET (slider));
 394 }
 395
 396 void
 397 sp_color_slider_set_map (SPColorSlider *slider, const guchar *map)
 398 {
 399         g_return_if_fail (slider != NULL);
 400         g_return_if_fail (SP_IS_COLOR_SLIDER (slider));
 401
 402         slider->map = (guchar *) map;
 403
 404         gtk_widget_queue_draw (GTK_WIDGET (slider));
 405 }
 406
 407 void
 408 sp_color_slider_set_background (SPColorSlider *slider, guint dark, guint light, guint size)
 409 {
 410         g_return_if_fail (slider != NULL);
 411         g_return_if_fail (SP_IS_COLOR_SLIDER (slider));
 412
 413         slider->b0 = dark;
 414         slider->b1 = light;
 415         slider->bmask = size;
 416
 417         gtk_widget_queue_draw (GTK_WIDGET (slider));
 418 }
 419
 420 static void
 421 sp_color_slider_adjustment_changed (GtkAdjustment */*adjustment*/, SPColorSlider *slider)
 422 {
 423         gtk_widget_queue_draw (GTK_WIDGET (slider));
 424 }
 425
 426 static void
 427 sp_color_slider_adjustment_value_changed (GtkAdjustment *adjustment, SPColorSlider *slider)
 428 {
 429         GtkWidget *widget;
 430
 431         widget = GTK_WIDGET (slider);
 432
 433         if (slider->value != ColorScales::getScaled( adjustment )) {
 434                 gint cx, cy, cw, ch;
 435                 cx = widget->style->xthickness;
 436                 cy = widget->style->ythickness;
 437                 cw = widget->allocation.width - 2 * cx;
 438                 ch = widget->allocation.height - 2 * cy;
 439                 if ((gint) (ColorScales::getScaled( adjustment ) * cw) != (gint) (slider->value * cw)) {
 440                         gint ax, ay;
 441                         gfloat value;
 442                         value = slider->value;
 443                         slider->value = ColorScales::getScaled( adjustment );
 444                         ax = (int)(cx + value * cw - ARROW_SIZE / 2 - 2);
 445                         ay = cy;
 446                         gtk_widget_queue_draw_area (widget, ax, ay, ARROW_SIZE + 4, ch);
 447                         ax = (int)(cx + slider->value * cw - ARROW_SIZE / 2 - 2);
 448                         ay = cy;
 449                         gtk_widget_queue_draw_area (widget, ax, ay, ARROW_SIZE + 4, ch);
 450                 } else {
 451                         slider->value = ColorScales::getScaled( adjustment );
 452                 }
 453         }
 454 }
 455
 456 static void
 457 sp_color_slider_paint (SPColorSlider *slider, GdkRectangle *area)
 458 {
 459         GtkWidget *widget;
 460         GdkRectangle warea, carea, aarea;
 461         GdkRectangle wpaint, cpaint, apaint;
 462         const guchar *b;
 463         gint w, x, y1, y2;
 464         gboolean colorsOnTop = Inkscape::Preferences::get()->getBool("/options/workarounds/colorsontop", false);
 465
 466         widget = GTK_WIDGET (slider);
 467
 468         /* Widget area */
 469         warea.x = 0;
 470         warea.y = 0;
 471         warea.width = widget->allocation.width;
 472         warea.height = widget->allocation.height;
 473
 474         /* Color gradient area */
 475         carea.x = widget->style->xthickness;
 476         carea.y = widget->style->ythickness;
 477         carea.width = widget->allocation.width - 2 * carea.x;
 478         carea.height = widget->allocation.height - 2 * carea.y;
 479
 480         /* Arrow area */
 481         aarea.x = (int)(slider->value * (carea.width - 1) - ARROW_SIZE / 2 + carea.x);
 482         aarea.width = ARROW_SIZE;
 483         aarea.y = carea.y;
 484         aarea.height = carea.height;
 485
 486         /* Actual paintable area */
 487         if (!gdk_rectangle_intersect (area, &warea, &wpaint)) {
 488           return;
 489         }
 490
 491         b = NULL;
 492
 493         // Draw shadow
 494         if (colorsOnTop) {
 495             gtk_paint_shadow( widget->style, widget->window,
 496                               (GtkStateType)widget->state, GTK_SHADOW_IN,
 497                               area, widget, "colorslider",
 498                               0, 0,
 499                               warea.width, warea.height);
 500         }
 501
 502         /* Paintable part of color gradient area */
 503         if (gdk_rectangle_intersect (area, &carea, &cpaint)) {
 504                 if (slider->map) {
 505                         gint s, d;
 506                         /* Render map pixelstore */
 507                         d = (1024 << 16) / carea.width;
 508                         s = (cpaint.x - carea.x) * d;
 509                         b = sp_color_slider_render_map (cpaint.x - carea.x, cpaint.y - carea.y, cpaint.width, cpaint.height,
 510                                                                                                                                                         slider->map, s, d,
 511                                                                                                                                                         slider->b0, slider->b1, slider->bmask);
 512                         if (b != NULL) {
 513                                 gdk_draw_rgb_image (widget->window, widget->style->black_gc,
 514                                                                                                                 cpaint.x, cpaint.y,
 515                                                                                                                 cpaint.width, cpaint.height,
 516                                                                                                                 GDK_RGB_DITHER_MAX,
 517                                                                                                                 (guchar *) b, cpaint.width * 3);
 518                         }
 519
 520                 } else {
 521                         gint c[4], dc[4];
 522                         gint i;
 523                         /* Render gradient */
 524
 525                         // part 1: from c0 to cm
 526                         if ((cpaint.x - carea.x) <= carea.width/2) {
 527                                 for (i = 0; i < 4; i++) {
 528                                         c[i] = slider->c0[i] << 16;
 529                                         dc[i] = ((slider->cm[i] << 16) - c[i]) / (carea.width/2);
 530                                         c[i] += (cpaint.x - carea.x) * dc[i];
 531                                 }
 532                                 guint wi = MIN(cpaint.x - carea.x + cpaint.width, carea.width/2) - (cpaint.x - carea.x);
 533                                 b = sp_color_slider_render_gradient (cpaint.x - carea.x, cpaint.y - carea.y, wi, cpaint.height,
 534                                                                                                          c, dc,
 535                                                                                                          slider->b0, slider->b1, slider->bmask);
 536
 537                                 /* Draw pixelstore */
 538                                 if (b != NULL) {
 539                                         gdk_draw_rgb_image (widget->window, widget->style->black_gc,
 540                                                                                                                         cpaint.x, cpaint.y,
 541                                                                                                                         wi, cpaint.height,
 542                                                                                                                         GDK_RGB_DITHER_MAX,
 543                                                                                                                         (guchar *) b, wi * 3);
 544                                 }
 545                         }
 546
 547                         // part 2: from cm to c1
 548                         if ((cpaint.x - carea.x + cpaint.width) > carea.width/2) {
 549                                 for (i = 0; i < 4; i++) {
 550                                         c[i] = slider->cm[i] << 16;
 551                                         dc[i] = ((slider->c1[i] << 16) - c[i]) / (carea.width/2);
 552                                         if ((cpaint.x - carea.x) > carea.width/2)
 553                                                 c[i] += (cpaint.x - carea.x - carea.width/2) * dc[i];
 554                                 }
 555                                 guint wi = cpaint.width - MAX(0, (carea.width/2 - (cpaint.x - carea.x)));
 556                                 b = sp_color_slider_render_gradient (MAX(cpaint.x - carea.x, carea.width/2), cpaint.y - carea.y, wi, cpaint.height,
 557                                                                                                  c, dc,
 558                                                                                                  slider->b0, slider->b1, slider->bmask);
 559
 560                                 /* Draw pixelstore */
 561                                 if (b != NULL) {
 562                                         gdk_draw_rgb_image (widget->window, widget->style->black_gc,
 563                                                                                                                         MAX(cpaint.x, carea.width/2 + carea.x), cpaint.y,
 564                                                                                                                         wi, cpaint.height,
 565                                                                                                                         GDK_RGB_DITHER_MAX,
 566                                                                                                                         (guchar *) b, wi * 3);
 567                                 }
 568                         }
 569                 }
 570         }
 571
 572         /* Draw shadow */
 573         if (!colorsOnTop) {
 574             gtk_paint_shadow( widget->style, widget->window,
 575                               (GtkStateType)widget->state, GTK_SHADOW_IN,
 576                               area, widget, "colorslider",
 577                               0, 0,
 578                               warea.width, warea.height);
 579         }
 580
 581
 582         if (gdk_rectangle_intersect (area, &aarea, &apaint)) {
 583                 /* Draw arrow */
 584                 gdk_rectangle_intersect (&carea, &apaint, &apaint);
 585                 gdk_gc_set_clip_rectangle (widget->style->white_gc, &apaint);
 586                 gdk_gc_set_clip_rectangle (widget->style->black_gc, &apaint);
 587
 588                 x = aarea.x;
 589                 y1 = carea.y;
 590                 y2 = aarea.y + aarea.height - 1;
 591                 w = aarea.width;
 592                 while ( w > 0 )
 593                 {
 594                         gdk_draw_line (widget->window, widget->style->white_gc, x, y1, x + w - 1, y1 );
 595                         gdk_draw_line (widget->window, widget->style->white_gc, x, y2, x + w - 1, y2 );
 596                         w -=2;
 597                         x++;
 598                         if ( w > 0 )
 599                         {
 600                                 gdk_draw_line (widget->window, widget->style->black_gc, x, y1, x + w - 1, y1 );
 601                                 gdk_draw_line (widget->window, widget->style->black_gc, x, y2, x + w - 1, y2 );
 602                         }
 603                         y1++;
 604                         y2--;
 605                 }
 606
 607                 gdk_gc_set_clip_rectangle (widget->style->white_gc, NULL);
 608                 gdk_gc_set_clip_rectangle (widget->style->black_gc, NULL);
 609         }
 610 }
 611
 612 /* Colors are << 16 */
 613
 614 static const guchar *
 615 sp_color_slider_render_gradient (gint x0, gint y0, gint width, gint height,
 616                                  gint c[], gint dc[], guint b0, guint b1, guint mask)
 617 {
 618         static guchar *buf = NULL;
 619         static gint bs = 0;
 620         guchar *dp;
 621         gint x, y;
 622         guint r, g, b, a;
 623
 624         if (buf && (bs < width * height)) {
 625                 g_free (buf);
 626                 buf = NULL;
 627         }
 628         if (!buf) {
 629                 buf = g_new (guchar, width * height * 3);
 630                 bs = width * height;
 631         }
 632
 633         dp = buf;
 634         r = c[0];
 635         g = c[1];
 636         b = c[2];
 637         a = c[3];
 638         for (x = x0; x < x0 + width; x++) {
 639                 gint cr, cg, cb, ca;
 640                 guchar *d;
 641                 cr = r >> 16;
 642                 cg = g >> 16;
 643                 cb = b >> 16;
 644                 ca = a >> 16;
 645                 d = dp;
 646                 for (y = y0; y < y0 + height; y++) {
 647                         guint bg, fc;
 648                         /* Background value */
 649                         bg = ((x & mask) ^ (y & mask)) ? b0 : b1;
 650                         fc = (cr - bg) * ca;
 651                         d[0] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
 652                         fc = (cg - bg) * ca;
 653                         d[1] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
 654                         fc = (cb - bg) * ca;
 655                         d[2] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
 656                         d += 3 * width;
 657                 }
 658                 r += dc[0];
 659                 g += dc[1];
 660                 b += dc[2];
 661                 a += dc[3];
 662                 dp += 3;
 663         }
 664
 665         return buf;
 666 }
 667
 668 /* Positions are << 16 */
 669
 670 static const guchar *
 671 sp_color_slider_render_map (gint x0, gint y0, gint width, gint height,
 672                             guchar *map, gint start, gint step, guint b0, guint b1, guint mask)
 673 {
 674         static guchar *buf = NULL;
 675         static gint bs = 0;
 676         guchar *dp, *sp;
 677         gint x, y;
 678
 679         if (buf && (bs < width * height)) {
 680                 g_free (buf);
 681                 buf = NULL;
 682         }
 683         if (!buf) {
 684                 buf = g_new (guchar, width * height * 3);
 685                 bs = width * height;
 686         }
 687
 688         dp = buf;
 689         for (x = x0; x < x0 + width; x++) {
 690                 gint cr, cg, cb, ca;
 691                 guchar *d;
 692                 sp = map + 4 * (start >> 16);
 693                 cr = *sp++;
 694                 cg = *sp++;
 695                 cb = *sp++;
 696                 ca = *sp++;
 697                 d = dp;
 698                 for (y = y0; y < y0 + height; y++) {
 699                         guint bg, fc;
 700                         /* Background value */
 701                         bg = ((x & mask) ^ (y & mask)) ? b0 : b1;
 702                         fc = (cr - bg) * ca;
 703                         d[0] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
 704                         fc = (cg - bg) * ca;
 705                         d[1] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
 706                         fc = (cb - bg) * ca;
 707                         d[2] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
 708                         d += 3 * width;
 709                 }
 710                 dp += 3;
 711                 start += step;
 712         }
 713
 714         return buf;
 715 }
 716