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app: port GimpColorBar drawing to cairo

This commit is contained in:
Michael Natterer 2010-07-30 14:58:55 +02:00
parent ac80163771
commit 208096bc7c
1 changed files with 47 additions and 43 deletions
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90
app/widgets/gimpcolorbar.c
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@ -21,6 +21,8 @@
#include <gtk/gtk.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpconfig/gimpconfig.h"
@ -153,14 +155,20 @@ static gboolean
gimp_color_bar_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GimpColorBar *bar = GIMP_COLOR_BAR (widget);
GtkStyle *style = gtk_widget_get_style (widget);
GtkAllocation allocation;
guchar *buf;
guchar *b;
gint x, y;
gint width, height;
gint i, j;
GimpColorBar *bar = GIMP_COLOR_BAR (widget);
cairo_t *cr;
GtkAllocation allocation;
cairo_surface_t *surface;
cairo_pattern_t *pattern;
guchar *b;
gint x, y;
gint width, height;
gint i;
cr = gdk_cairo_create (event->window);
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
gtk_widget_get_allocation (widget, &allocation);
@ -172,46 +180,42 @@ gimp_color_bar_expose (GtkWidget *widget,
if (width < 1 || height < 1)
return TRUE;
buf = g_alloca (width * height * 3);
cairo_translate (cr, allocation.x + x, allocation.y + y);
cairo_rectangle (cr, 0, 0, width, height);
cairo_clip (cr);
switch (bar->orientation)
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 256, 1);
for (i = 0, b = cairo_image_surface_get_data (surface);
i < 256;
i++, b += 4)
{
case GTK_ORIENTATION_HORIZONTAL:
for (i = 0, b = buf; i < width; i++, b += 3)
{
const guchar *src = bar->buf + 3 * ((i * 256) / width);
const guchar *src = bar->buf + 3 * i;
b[0] = src[0];
b[1] = src[1];
b[2] = src[2];
}
for (i = 1; i < height; i++)
memcpy (buf + i * width * 3, buf, width * 3);
break;
case GTK_ORIENTATION_VERTICAL:
for (i = 0, b = buf; i < height; i++, b += 3 * width)
{
const guchar *src = bar->buf + 3 * (255 - ((i * 256) / height));
guchar *dest = b;
for (j = 0; j < width; j++, dest += 3)
{
dest[0] = src[0];
dest[1] = src[1];
dest[2] = src[2];
}
}
break;
GIMP_CAIRO_RGB24_SET_PIXEL(b, src[0], src[1], src[2]);
}
gdk_draw_rgb_image (gtk_widget_get_window (widget), style->black_gc,
allocation.x + x, allocation.y + y,
width, height,
GDK_RGB_DITHER_NORMAL,
buf, 3 * width);
pattern = cairo_pattern_create_for_surface (surface);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REFLECT);
cairo_surface_destroy (surface);
if (bar->orientation == GTK_ORIENTATION_HORIZONTAL)
{
cairo_scale (cr, (gdouble) width / 256.0, 1.0);
}
else
{
cairo_translate (cr, 0, height);
cairo_scale (cr, 1.0, (gdouble) height / 256.0);
cairo_rotate (cr, - G_PI / 2);
}
cairo_set_source (cr, pattern);
cairo_pattern_destroy (pattern);
cairo_paint (cr);
cairo_destroy (cr);
return TRUE;
}