Color implemtnation

svn path=/trunk/; revision=373

widgets/misc/e-colors.c

@@ -0,0 +1,67 @@
+/*
+ * color.c: Color allocation on the Gnumeric spreadsheet
+ *
+ * Author:
+ *  Miguel de Icaza (miguel@kernel.org)
+ *
+ * We keep our own color context, as the color allocation might take place
+ * before any of our Canvases are realized.
+ */
+#include <config.h>
+#include <gnome.h>
+#include "color.h"
+
+static int color_inited;
+GdkColorContext *gnumeric_color_context;
+
+int 
+color_alloc (gushort red, gushort green, gushort blue)
+{
+	int failed;
+	
+	if (!color_inited)
+		color_init ();
+	
+	return gdk_color_context_get_pixel (gnumeric_color_context,
+					    red, green, blue, &failed);
+}
+
+void
+color_alloc_gdk (GdkColor *c)
+{
+	int failed;
+	
+	g_return_if_fail (c != NULL);
+	
+	c->pixel = gdk_color_context_get_pixel (gnumeric_color_context, c->red, c->green, c->blue, &failed);
+}
+
+void
+color_alloc_name (char *name, GdkColor *c)
+{
+	int failed;
+	
+	g_return_if_fail (name != NULL);
+	g_return_if_fail (c != NULL);
+
+	gdk_color_parse (name, c);
+	c->pixel = 0;
+	c->pixel = gdk_color_context_get_pixel (gnumeric_color_context, c->red, c->green, c->blue, &failed);
+}
+
+void
+color_init (void)
+{
+	GdkColormap *colormap = gtk_widget_get_default_colormap ();
+	
+	/* Initialize the color context */
+	gnumeric_color_context = gdk_color_context_new (
+		gtk_widget_get_default_visual (), colormap);
+
+	/* Allocate the default colors */
+	gdk_color_white (colormap, &gs_white);
+	gdk_color_black (colormap, &gs_black);
+
+	color_alloc_name ("gray60", &gs_light_gray);
+	color_alloc_name ("gray20", &gs_dark_gray);
+}

widgets/misc/e-colors.h

@@ -0,0 +1,14 @@
+#ifndef COLOR_H
+#define COLOR_H
+
+void     color_init      (void);
+
+/* Return the pixel value for the given red, green and blue */
+int      color_alloc      (gushort red, gushort green, gushort blue);
+void     color_alloc_name (char *name, GdkColor *color);
+void     color_alloc_gdk  (GdkColor *color);
+
+/* Colors used by any GnumericSheet item */
+extern GdkColor gs_white, gs_light_gray, gs_dark_gray, gs_black;
+
+#endif