static GdkPixmap *
scale_pixmap (GdkWindow *window, GdkPixmap *pixmap, gdouble scale_x, gdouble scale_y)
{
GdkGC *gc;
GdkColormap *colormap;
GdkColorContext *cc;
GdkVisual *visual;
GdkImage *image;
GdkPixmap *new_pixmap;
gint x, y, width, height, new_width, new_height;
if(!pixmap) return NULL;
if(!window) return NULL;
gc = gdk_gc_new(pixmap);
colormap = gdk_colormap_get_system ();
visual = gdk_visual_get_system ();
cc = gdk_color_context_new(visual, colormap);
gdk_window_get_size(pixmap, &width, &height);
if(scale_x == 1.0 && scale_y == 1.0){
new_pixmap = gdk_pixmap_new(window, width, height, -1);
gdk_draw_pixmap(new_pixmap,
gc,
pixmap,
0, 0,
0, 0,
width, height);
return new_pixmap;
}
new_width = roundint(width * scale_x);
new_height = roundint(height * scale_y);
new_pixmap = gdk_pixmap_new(window, new_width, new_height, -1);
image = gdk_image_get(pixmap,
0, 0,
width, height);
for(x = 0; x < new_width; x++){
for(y = 0; y < new_height; y++){
GdkColor color;
gint px, py;
px = MIN(roundint(x / scale_x), width - 1);
py = MIN(roundint(y / scale_y), height - 1);
color.pixel = gdk_image_get_pixel(image, px, py);
gdk_color_context_query_color(cc, &color);
gdk_gc_set_foreground(gc, &color);
gdk_draw_point(new_pixmap, gc, x, y);
}
}
gdk_image_destroy(image);
gdk_color_context_free(cc);
return new_pixmap;
}
void
color_init(void)
{
GdkVisual *visual = gtk_widget_get_default_visual();
GdkColormap *colormap = gtk_widget_get_default_colormap();
color_context = gdk_color_context_new(visual, colormap);
color_convert(&color_black, &color_gdk_black);
color_convert(&color_white, &color_gdk_white);
}
