moving trunk for module inkscape

(bzr r1)

1 files changed, 687 insertions, 0 deletions

diff --git a/src/widgets/sp-color-slider.cpp b/src/widgets/sp-color-slider.cpp
new file mode 100644
index 000000000..76ef13a8d
--- /dev/null
+++ b/src/widgets/sp-color-slider.cpp
@@ -0,0 +1,687 @@
+#define __SP_COLOR_SLIDER_C__
+
+/*
+ * A slider with colored background
+ *
+ * Author:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   bulia byak <buliabyak@users.sf.net>
+ *
+ * Copyright (C) 2001-2002 Lauris Kaplinski
+ *
+ * This code is in public domain
+ */
+
+#include <gtk/gtksignal.h>
+#include "sp-color-scales.h"
+
+#define SLIDER_WIDTH 96
+#define SLIDER_HEIGHT 8
+#define ARROW_SIZE 7
+
+enum {
+	GRABBED,
+	DRAGGED,
+	RELEASED,
+	CHANGED,
+	LAST_SIGNAL
+};
+
+static void sp_color_slider_class_init (SPColorSliderClass *klass);
+static void sp_color_slider_init (SPColorSlider *slider);
+static void sp_color_slider_destroy (GtkObject *object);
+
+static void sp_color_slider_realize (GtkWidget *widget);
+static void sp_color_slider_size_request (GtkWidget *widget, GtkRequisition *requisition);
+static void sp_color_slider_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
+/*  static void sp_color_slider_draw (GtkWidget *widget, GdkRectangle *area); */
+/*  static void sp_color_slider_draw_focus (GtkWidget *widget); */
+/*  static void sp_color_slider_draw_default (GtkWidget *widget); */
+
+static gint sp_color_slider_expose (GtkWidget *widget, GdkEventExpose *event);
+static gint sp_color_slider_button_press (GtkWidget *widget, GdkEventButton *event);
+static gint sp_color_slider_button_release (GtkWidget *widget, GdkEventButton *event);
+static gint sp_color_slider_motion_notify (GtkWidget *widget, GdkEventMotion *event);
+
+static void sp_color_slider_adjustment_changed (GtkAdjustment *adjustment, SPColorSlider *slider);
+static void sp_color_slider_adjustment_value_changed (GtkAdjustment *adjustment, SPColorSlider *slider);
+
+static void sp_color_slider_paint (SPColorSlider *slider, GdkRectangle *area);
+static const guchar *sp_color_slider_render_gradient (gint x0, gint y0, gint width, gint height,
+						      gint c[], gint dc[], guint b0, guint b1, guint mask);
+static const guchar *sp_color_slider_render_map (gint x0, gint y0, gint width, gint height,
+						 guchar *map, gint start, gint step, guint b0, guint b1, guint mask);
+
+static GtkWidgetClass *parent_class;
+static guint slider_signals[LAST_SIGNAL] = {0};
+
+GtkType
+sp_color_slider_get_type (void)
+{
+	static GtkType type = 0;
+	if (!type) {
+		GtkTypeInfo info = {
+			"SPColorSlider",
+			sizeof (SPColorSlider),
+			sizeof (SPColorSliderClass),
+			(GtkClassInitFunc) sp_color_slider_class_init,
+			(GtkObjectInitFunc) sp_color_slider_init,
+			NULL, NULL, NULL
+		};
+		type = gtk_type_unique (GTK_TYPE_WIDGET, &info);
+	}
+	return type;
+}
+
+static void
+sp_color_slider_class_init (SPColorSliderClass *klass)
+{
+	GtkObjectClass *object_class;
+	GtkWidgetClass *widget_class;
+
+	object_class = (GtkObjectClass *) klass;
+	widget_class = (GtkWidgetClass *) klass;
+
+	parent_class = (GtkWidgetClass*)gtk_type_class (GTK_TYPE_WIDGET);
+
+	slider_signals[GRABBED] = gtk_signal_new ("grabbed",
+						  (GtkSignalRunType)(GTK_RUN_FIRST | GTK_RUN_NO_RECURSE),
+						  GTK_CLASS_TYPE(object_class),
+						  GTK_SIGNAL_OFFSET (SPColorSliderClass, grabbed),
+						  gtk_marshal_NONE__NONE,
+						  GTK_TYPE_NONE, 0);
+	slider_signals[DRAGGED] = gtk_signal_new ("dragged",
+						  (GtkSignalRunType)(GTK_RUN_FIRST | GTK_RUN_NO_RECURSE),
+						  GTK_CLASS_TYPE(object_class),
+						  GTK_SIGNAL_OFFSET (SPColorSliderClass, dragged),
+						  gtk_marshal_NONE__NONE,
+						  GTK_TYPE_NONE, 0);
+	slider_signals[RELEASED] = gtk_signal_new ("released",
+						  (GtkSignalRunType)(GTK_RUN_FIRST | GTK_RUN_NO_RECURSE),
+						  GTK_CLASS_TYPE(object_class),
+						  GTK_SIGNAL_OFFSET (SPColorSliderClass, released),
+						  gtk_marshal_NONE__NONE,
+						  GTK_TYPE_NONE, 0);
+	slider_signals[CHANGED] = gtk_signal_new ("changed",
+						  (GtkSignalRunType)(GTK_RUN_FIRST | GTK_RUN_NO_RECURSE),
+						  GTK_CLASS_TYPE(object_class),
+						  GTK_SIGNAL_OFFSET (SPColorSliderClass, changed),
+						  gtk_marshal_NONE__NONE,
+						  GTK_TYPE_NONE, 0);
+
+	object_class->destroy = sp_color_slider_destroy;
+
+	widget_class->realize = sp_color_slider_realize;
+	widget_class->size_request = sp_color_slider_size_request;
+	widget_class->size_allocate = sp_color_slider_size_allocate;
+/*  	widget_class->draw = sp_color_slider_draw; */
+/*  	widget_class->draw_focus = sp_color_slider_draw_focus; */
+/*  	widget_class->draw_default = sp_color_slider_draw_default; */
+
+	widget_class->expose_event = sp_color_slider_expose;
+	widget_class->button_press_event = sp_color_slider_button_press;
+	widget_class->button_release_event = sp_color_slider_button_release;
+	widget_class->motion_notify_event = sp_color_slider_motion_notify;
+}
+
+static void
+sp_color_slider_init (SPColorSlider *slider)
+{
+	/* We are widget with window */
+	GTK_WIDGET_UNSET_FLAGS (slider, GTK_NO_WINDOW);
+
+	slider->dragging = FALSE;
+
+	slider->adjustment = NULL;
+	slider->value = 0.0;
+
+	slider->c0[0] = 0x00;
+	slider->c0[1] = 0x00;
+	slider->c0[2] = 0x00;
+	slider->c0[3] = 0xff;
+
+	slider->cm[0] = 0xff;
+	slider->cm[1] = 0x00;
+	slider->cm[2] = 0x00;
+	slider->cm[3] = 0xff;
+
+	slider->c1[0] = 0xff;
+	slider->c1[1] = 0xff;
+	slider->c1[2] = 0xff;
+	slider->c1[3] = 0xff;
+
+	slider->b0 = 0x5f;
+	slider->b1 = 0xa0;
+	slider->bmask = 0x08;
+
+	slider->map = NULL;
+}
+
+static void
+sp_color_slider_destroy (GtkObject *object)
+{
+	SPColorSlider *slider;
+
+	slider = SP_COLOR_SLIDER (object);
+
+	if (slider->adjustment) {
+		gtk_signal_disconnect_by_data (GTK_OBJECT (slider->adjustment), slider);
+		gtk_object_unref (GTK_OBJECT (slider->adjustment));
+		slider->adjustment = NULL;
+	}
+
+	if (((GtkObjectClass *) (parent_class))->destroy)
+		(* ((GtkObjectClass *) (parent_class))->destroy) (object);
+}
+
+static void
+sp_color_slider_realize (GtkWidget *widget)
+{
+	SPColorSlider *slider;
+	GdkWindowAttr attributes;
+	gint attributes_mask;
+
+	slider = SP_COLOR_SLIDER (widget);
+
+	GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
+
+	attributes.window_type = GDK_WINDOW_CHILD;
+	attributes.x = widget->allocation.x;
+	attributes.y = widget->allocation.y;
+	attributes.width = widget->allocation.width;
+	attributes.height = widget->allocation.height;
+	attributes.wclass = GDK_INPUT_OUTPUT;
+	attributes.visual = gdk_rgb_get_visual ();
+	attributes.colormap = gdk_rgb_get_cmap ();
+	attributes.event_mask = gtk_widget_get_events (widget);
+	attributes.event_mask |= (GDK_EXPOSURE_MASK |
+				  GDK_BUTTON_PRESS_MASK |
+				  GDK_BUTTON_RELEASE_MASK |
+				  GDK_POINTER_MOTION_MASK |
+				  GDK_ENTER_NOTIFY_MASK |
+				  GDK_LEAVE_NOTIFY_MASK);
+	attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
+
+	widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
+	gdk_window_set_user_data (widget->window, widget);
+
+	widget->style = gtk_style_attach (widget->style, widget->window);
+}
+
+static void
+sp_color_slider_size_request (GtkWidget *widget, GtkRequisition *requisition)
+{
+	SPColorSlider *slider;
+
+	slider = SP_COLOR_SLIDER (widget);
+
+	requisition->width = SLIDER_WIDTH + widget->style->xthickness * 2;
+	requisition->height = SLIDER_HEIGHT + widget->style->ythickness * 2;
+}
+
+static void
+sp_color_slider_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
+{
+	SPColorSlider *slider;
+
+	slider = SP_COLOR_SLIDER (widget);
+
+	widget->allocation = *allocation;
+
+	if (GTK_WIDGET_REALIZED (widget)) {
+		/* Resize GdkWindow */
+		gdk_window_move_resize (widget->window, allocation->x, allocation->y, allocation->width, allocation->height);
+	}
+}
+
+static gint
+sp_color_slider_expose (GtkWidget *widget, GdkEventExpose *event)
+{
+	SPColorSlider *slider;
+
+	slider = SP_COLOR_SLIDER (widget);
+
+	if (GTK_WIDGET_DRAWABLE (widget)) {
+		gint width, height;
+		width = widget->allocation.width;
+		height = widget->allocation.height;
+		sp_color_slider_paint (slider, &event->area);
+	}
+
+	return FALSE;
+}
+
+static gint
+sp_color_slider_button_press (GtkWidget *widget, GdkEventButton *event)
+{
+	SPColorSlider *slider;
+
+	slider = SP_COLOR_SLIDER (widget);
+
+	if (event->button == 1) {
+		gint cx, cw;
+		cx = widget->style->xthickness;
+		cw = widget->allocation.width - 2 * cx;
+		gtk_signal_emit (GTK_OBJECT (slider), slider_signals[GRABBED]);
+		slider->dragging = TRUE;
+		slider->oldvalue = slider->value;
+		ColorScales::setScaled( slider->adjustment, CLAMP ((gfloat) (event->x - cx) / cw, 0.0, 1.0) );
+		gtk_signal_emit (GTK_OBJECT (slider), slider_signals[DRAGGED]);
+		gdk_pointer_grab (widget->window, FALSE,
+				  (GdkEventMask)(GDK_POINTER_MOTION_MASK |
+				  GDK_BUTTON_RELEASE_MASK),
+				  NULL, NULL, event->time);
+	}
+
+	return FALSE;
+}
+
+static gint
+sp_color_slider_button_release (GtkWidget *widget, GdkEventButton *event)
+{
+	SPColorSlider *slider;
+
+	slider = SP_COLOR_SLIDER (widget);
+
+	if (event->button == 1) {
+		gdk_pointer_ungrab (event->time);
+		slider->dragging = FALSE;
+		gtk_signal_emit (GTK_OBJECT (slider), slider_signals[RELEASED]);
+		if (slider->value != slider->oldvalue) gtk_signal_emit (GTK_OBJECT (slider), slider_signals[CHANGED]);
+	}
+
+	return FALSE;
+}
+
+static gint
+sp_color_slider_motion_notify (GtkWidget *widget, GdkEventMotion *event)
+{
+	SPColorSlider *slider;
+
+	slider = SP_COLOR_SLIDER (widget);
+
+	if (slider->dragging) {
+		gint cx, cw;
+		cx = widget->style->xthickness;
+		cw = widget->allocation.width - 2 * cx;
+		ColorScales::setScaled( slider->adjustment, CLAMP ((gfloat) (event->x - cx) / cw, 0.0, 1.0) );
+		gtk_signal_emit (GTK_OBJECT (slider), slider_signals[DRAGGED]);
+	}
+
+	return FALSE;
+}
+
+GtkWidget *
+sp_color_slider_new (GtkAdjustment *adjustment)
+{
+	SPColorSlider *slider;
+
+	slider = (SPColorSlider*)gtk_type_new (SP_TYPE_COLOR_SLIDER);
+
+	sp_color_slider_set_adjustment (slider, adjustment);
+
+	return GTK_WIDGET (slider);
+}
+
+void
+sp_color_slider_set_adjustment (SPColorSlider *slider, GtkAdjustment *adjustment)
+{
+	g_return_if_fail (slider != NULL);
+	g_return_if_fail (SP_IS_COLOR_SLIDER (slider));
+
+	if (!adjustment) {
+		adjustment = (GtkAdjustment *) gtk_adjustment_new (0.0, 0.0, 1.0, 0.01, 0.1, 0.1);
+	}
+
+	if (slider->adjustment != adjustment) {
+		if (slider->adjustment) {
+			gtk_signal_disconnect_by_data (GTK_OBJECT (slider->adjustment), slider);
+			gtk_object_unref (GTK_OBJECT (slider->adjustment));
+		}
+
+		slider->adjustment = adjustment;
+		gtk_object_ref (GTK_OBJECT (adjustment));
+		gtk_object_sink (GTK_OBJECT (adjustment));
+
+		gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
+				    GTK_SIGNAL_FUNC (sp_color_slider_adjustment_changed), slider);
+		gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
+				    GTK_SIGNAL_FUNC (sp_color_slider_adjustment_value_changed), slider);
+
+		slider->value = ColorScales::getScaled( adjustment );
+
+		sp_color_slider_adjustment_changed (adjustment, slider);
+	}
+}
+
+void
+sp_color_slider_set_colors (SPColorSlider *slider, guint32 start, guint32 mid, guint32 end)
+{
+	g_return_if_fail (slider != NULL);
+	g_return_if_fail (SP_IS_COLOR_SLIDER (slider));
+
+	slider->c0[0] = start >> 24;
+	slider->c0[1] = (start >> 16) & 0xff;
+	slider->c0[2] = (start >> 8) & 0xff;
+	slider->c0[3] = start & 0xff;
+
+	slider->cm[0] = mid >> 24;
+	slider->cm[1] = (mid >> 16) & 0xff;
+	slider->cm[2] = (mid >> 8) & 0xff;
+	slider->cm[3] = mid & 0xff;
+
+	slider->c1[0] = end >> 24;
+	slider->c1[1] = (end >> 16) & 0xff;
+	slider->c1[2] = (end >> 8) & 0xff;
+	slider->c1[3] = end & 0xff;
+
+	gtk_widget_queue_draw (GTK_WIDGET (slider));
+}
+
+void
+sp_color_slider_set_map (SPColorSlider *slider, const guchar *map)
+{
+	g_return_if_fail (slider != NULL);
+	g_return_if_fail (SP_IS_COLOR_SLIDER (slider));
+
+	slider->map = (guchar *) map;
+
+	gtk_widget_queue_draw (GTK_WIDGET (slider));
+}
+
+void
+sp_color_slider_set_background (SPColorSlider *slider, guint dark, guint light, guint size)
+{
+	g_return_if_fail (slider != NULL);
+	g_return_if_fail (SP_IS_COLOR_SLIDER (slider));
+
+	slider->b0 = dark;
+	slider->b1 = light;
+	slider->bmask = size;
+
+	gtk_widget_queue_draw (GTK_WIDGET (slider));
+}
+
+static void
+sp_color_slider_adjustment_changed (GtkAdjustment *adjustment, SPColorSlider *slider)
+{
+	gtk_widget_queue_draw (GTK_WIDGET (slider));
+}
+
+static void
+sp_color_slider_adjustment_value_changed (GtkAdjustment *adjustment, SPColorSlider *slider)
+{
+	GtkWidget *widget;
+
+	widget = GTK_WIDGET (slider);
+
+	if (slider->value != ColorScales::getScaled( adjustment )) {
+		gint cx, cy, cw, ch;
+		cx = widget->style->xthickness;
+		cy = widget->style->ythickness;
+		cw = widget->allocation.width - 2 * cx;
+		ch = widget->allocation.height - 2 * cy;
+		if ((gint) (ColorScales::getScaled( adjustment ) * cw) != (gint) (slider->value * cw)) {
+			gint ax, ay;
+			gfloat value;
+			value = slider->value;
+			slider->value = ColorScales::getScaled( adjustment );
+			ax = (int)(cx + value * cw - ARROW_SIZE / 2 - 2);
+			ay = cy;
+			gtk_widget_queue_draw_area (widget, ax, ay, ARROW_SIZE + 4, ch);
+			ax = (int)(cx + slider->value * cw - ARROW_SIZE / 2 - 2);
+			ay = cy;
+			gtk_widget_queue_draw_area (widget, ax, ay, ARROW_SIZE + 4, ch);
+		} else {
+			slider->value = ColorScales::getScaled( adjustment );
+		}
+	}
+}
+
+static void
+sp_color_slider_paint (SPColorSlider *slider, GdkRectangle *area)
+{
+	GtkWidget *widget;
+	GdkRectangle warea, carea, aarea;
+	GdkRectangle wpaint, cpaint, apaint;
+	const guchar *b;
+	gint w, x, y1, y2;
+
+	widget = GTK_WIDGET (slider);
+
+	/* Widget area */
+	warea.x = 0;
+	warea.y = 0;
+	warea.width = widget->allocation.width;
+	warea.height = widget->allocation.height;
+
+	/* Color gradient area */
+	carea.x = widget->style->xthickness;
+	carea.y = widget->style->ythickness;
+	carea.width = widget->allocation.width - 2 * carea.x;
+	carea.height = widget->allocation.height - 2 * carea.y;
+
+	/* Arrow area */
+	aarea.x = (int)(slider->value * (carea.width - 1) - ARROW_SIZE / 2 + carea.x);
+	aarea.width = ARROW_SIZE;
+	aarea.y = carea.y;
+	aarea.height = carea.height;
+
+	/* Actual paintable area */
+	if (!gdk_rectangle_intersect (area, &warea, &wpaint)) return;
+
+	b = NULL;
+
+	/* Paintable part of color gradient area */
+	if (gdk_rectangle_intersect (area, &carea, &cpaint)) {
+		if (slider->map) {
+			gint s, d;
+			/* Render map pixelstore */
+			d = (1024 << 16) / carea.width;
+			s = (cpaint.x - carea.x) * d;
+			b = sp_color_slider_render_map (cpaint.x - carea.x, cpaint.y - carea.y, cpaint.width, cpaint.height,
+																			slider->map, s, d,
+																			slider->b0, slider->b1, slider->bmask);
+			if (b != NULL) {
+				gdk_draw_rgb_image (widget->window, widget->style->black_gc,
+														cpaint.x, cpaint.y,
+														cpaint.width, cpaint.height,
+														GDK_RGB_DITHER_MAX,
+														(guchar *) b, cpaint.width * 3);
+			}
+
+		} else {
+			gint c[4], dc[4];
+			gint i;
+			/* Render gradient */
+
+			// part 1: from c0 to cm
+			if ((cpaint.x - carea.x) <= carea.width/2) {
+				for (i = 0; i < 4; i++) {
+					c[i] = slider->c0[i] << 16;
+					dc[i] = ((slider->cm[i] << 16) - c[i]) / (carea.width/2);
+					c[i] += (cpaint.x - carea.x) * dc[i];
+				}
+				guint wi = MIN(cpaint.x - carea.x + cpaint.width, carea.width/2) - (cpaint.x - carea.x);
+				b = sp_color_slider_render_gradient (cpaint.x - carea.x, cpaint.y - carea.y, wi, cpaint.height,
+													 c, dc,
+													 slider->b0, slider->b1, slider->bmask);
+
+				/* Draw pixelstore */
+				if (b != NULL) {
+					gdk_draw_rgb_image (widget->window, widget->style->black_gc,
+															cpaint.x, cpaint.y,
+															wi, cpaint.height,
+															GDK_RGB_DITHER_MAX,
+															(guchar *) b, wi * 3);
+				}
+			}
+
+			// part 2: from cm to c1
+			if ((cpaint.x - carea.x + cpaint.width) > carea.width/2) {
+				for (i = 0; i < 4; i++) {
+					c[i] = slider->cm[i] << 16;
+					dc[i] = ((slider->c1[i] << 16) - c[i]) / (carea.width/2);
+					if ((cpaint.x - carea.x) > carea.width/2)
+						c[i] += (cpaint.x - carea.x - carea.width/2) * dc[i];
+				}
+				guint wi = cpaint.width - MAX(0, (carea.width/2 - (cpaint.x - carea.x)));
+				b = sp_color_slider_render_gradient (MAX(cpaint.x - carea.x, carea.width/2), cpaint.y - carea.y, wi, cpaint.height,
+												 c, dc,
+												 slider->b0, slider->b1, slider->bmask);
+
+				/* Draw pixelstore */
+				if (b != NULL) {
+					gdk_draw_rgb_image (widget->window, widget->style->black_gc,
+															MAX(cpaint.x, carea.width/2 + carea.x), cpaint.y,
+															wi, cpaint.height,
+															GDK_RGB_DITHER_MAX,
+															(guchar *) b, wi * 3);
+				}
+			}
+		}
+	}
+
+	/* Draw shadow */
+	gtk_paint_shadow (widget->style, widget->window,
+			  (GtkStateType)widget->state, GTK_SHADOW_IN,
+			  area, widget, "colorslider",
+			  0, 0,
+			  warea.width, warea.height);
+
+
+	if (gdk_rectangle_intersect (area, &aarea, &apaint)) {
+		/* Draw arrow */
+		gdk_rectangle_intersect (&carea, &apaint, &apaint);
+		gdk_gc_set_clip_rectangle (widget->style->white_gc, &apaint);
+		gdk_gc_set_clip_rectangle (widget->style->black_gc, &apaint);
+
+		x = aarea.x;
+		y1 = carea.y;
+		y2 = aarea.y + aarea.height - 1;
+		w = aarea.width;
+		while ( w > 0 )
+		{
+			gdk_draw_line (widget->window, widget->style->white_gc, x, y1, x + w - 1, y1 );
+			gdk_draw_line (widget->window, widget->style->white_gc, x, y2, x + w - 1, y2 );
+			w -=2;
+			x++;
+			if ( w > 0 )
+			{
+				gdk_draw_line (widget->window, widget->style->black_gc, x, y1, x + w - 1, y1 );
+				gdk_draw_line (widget->window, widget->style->black_gc, x, y2, x + w - 1, y2 );
+			}
+			y1++;
+			y2--;
+		}
+
+		gdk_gc_set_clip_rectangle (widget->style->white_gc, NULL);
+		gdk_gc_set_clip_rectangle (widget->style->black_gc, NULL);
+	}
+}
+
+/* Colors are << 16 */
+
+static const guchar *
+sp_color_slider_render_gradient (gint x0, gint y0, gint width, gint height,
+				 gint c[], gint dc[], guint b0, guint b1, guint mask)
+{
+	static guchar *buf = NULL;
+	static gint bs = 0;
+	guchar *dp;
+	gint x, y;
+	guint r, g, b, a;
+
+	if (buf && (bs < width * height)) {
+		g_free (buf);
+		buf = NULL;
+	}
+	if (!buf) {
+		buf = g_new (guchar, width * height * 3);
+		bs = width * height;
+	}
+
+	dp = buf;
+	r = c[0];
+	g = c[1];
+	b = c[2];
+	a = c[3];
+	for (x = x0; x < x0 + width; x++) {
+		gint cr, cg, cb, ca;
+		guchar *d;
+		cr = r >> 16;
+		cg = g >> 16;
+		cb = b >> 16;
+		ca = a >> 16;
+		d = dp;
+		for (y = y0; y < y0 + height; y++) {
+			guint bg, fc;
+			/* Background value */
+			bg = ((x & mask) ^ (y & mask)) ? b0 : b1;
+			fc = (cr - bg) * ca;
+			d[0] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
+			fc = (cg - bg) * ca;
+			d[1] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
+			fc = (cb - bg) * ca;
+			d[2] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
+			d += 3 * width;
+		}
+		r += dc[0];
+		g += dc[1];
+		b += dc[2];
+		a += dc[3];
+		dp += 3;
+	}
+
+	return buf;
+}
+
+/* Positions are << 16 */
+
+static const guchar *
+sp_color_slider_render_map (gint x0, gint y0, gint width, gint height,
+			    guchar *map, gint start, gint step, guint b0, guint b1, guint mask)
+{
+	static guchar *buf = NULL;
+	static gint bs = 0;
+	guchar *dp, *sp;
+	gint x, y;
+
+	if (buf && (bs < width * height)) {
+		g_free (buf);
+		buf = NULL;
+	}
+	if (!buf) {
+		buf = g_new (guchar, width * height * 3);
+		bs = width * height;
+	}
+
+	dp = buf;
+	for (x = x0; x < x0 + width; x++) {
+		gint cr, cg, cb, ca;
+		guchar *d;
+		sp = map + 4 * (start >> 16);
+		cr = *sp++;
+		cg = *sp++;
+		cb = *sp++;
+		ca = *sp++;
+		d = dp;
+		for (y = y0; y < y0 + height; y++) {
+			guint bg, fc;
+			/* Background value */
+			bg = ((x & mask) ^ (y & mask)) ? b0 : b1;
+			fc = (cr - bg) * ca;
+			d[0] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
+			fc = (cg - bg) * ca;
+			d[1] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
+			fc = (cb - bg) * ca;
+			d[2] = bg + ((fc + (fc >> 8) + 0x80) >> 8);
+			d += 3 * width;
+		}
+		dp += 3;
+		start += step;
+	}
+
+	return buf;
+}
+