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