Add support for "colorize" image attribute.

2002-02-07  Anders Carlsson  <andersca@gnu.org>

	* src/theme-parser.c: (parse_draw_op_element):
	Add support for "colorize" image attribute.

	* src/theme.c: (colorize_pixbuf):
	New function that colorizes a pixbuf.

	(pos_tokenize): Allow "\n" as a whitespace character.

	(meta_draw_op_free): Free colorize_spec;

	(draw_op_as_pixbuf): Colorize image if needed.

	* src/theme.h: Add colorize_spec to struct.

ChangeLog

@@ -1,3 +1,19 @@
+2002-02-07  Anders Carlsson  <andersca@gnu.org>
+
+	* src/theme-parser.c: (parse_draw_op_element):
+	Add support for "colorize" image attribute.
+	
+	* src/theme.c: (colorize_pixbuf):
+	New function that colorizes a pixbuf.
+
+	(pos_tokenize): Allow "\n" as a whitespace character.
+	
+	(meta_draw_op_free): Free colorize_spec;
+
+	(draw_op_as_pixbuf): Colorize image if needed.
+	
+	* src/theme.h: Add colorize_spec to struct.
+
 2002-02-07  Anders Carlsson  <andersca@gnu.org>
 
 	* src/themes/Crux/metacity-theme-1.xml: Add maximized and

src/theme-parser.c

@@ -1991,14 +1991,17 @@ parse_draw_op_element (GMarkupParseContext  *context,
       const char *width;
       const char *height;
       const char *alpha;
+      const char *colorize;
       double alpha_val;
       GdkPixbuf *pixbuf;
+      MetaColorSpec *colorize_spec = NULL;
       
       if (!locate_attributes (context, element_name, attribute_names, attribute_values,
                               error,
                               "x", &x, "y", &y,
                               "width", &width, "height", &height,
                               "alpha", &alpha, "filename", &filename,
+			      "colorize", &colorize,
                               NULL))
         return;
       
@@ -2064,9 +2067,21 @@ parse_draw_op_element (GMarkupParseContext  *context,
           return;
         }
 
+      if (colorize)
+	{
+	  colorize_spec = meta_color_spec_new_from_string (colorize, error);
+
+	  if (colorize == NULL)
+	    {
+	      add_context_to_error (error, context);
+	      return;
+	    }
+	}
+      
       op = meta_draw_op_new (META_DRAW_IMAGE);
 
       op->data.image.pixbuf = pixbuf;
+      op->data.image.colorize_spec = colorize_spec;
       op->data.image.x = optimize_expression (info->theme, x);
       op->data.image.y = optimize_expression (info->theme, y);
       op->data.image.width = optimize_expression (info->theme, width);

src/theme.c

@@ -42,6 +42,48 @@
 #define ALPHA_TO_UCHAR(d) ((unsigned char) ((d) * 255))
 
 #define DEBUG_FILL_STRUCT(s) memset ((s), 0xef, sizeof (*(s)))
+#define INTENSITY(r, g, b) (r * 0.30 + g * 0.59 + b * 0.11)
+
+static GdkPixbuf *
+colorize_pixbuf (GdkPixbuf *orig, GdkColor *new_color)
+{
+  GdkPixbuf *pixbuf;
+  double intensity;
+  int x, y;
+  guchar r, g, b;
+  guchar *src, *dest;
+
+  r = new_color->red / 256;
+  g = new_color->green / 256;
+  b = new_color->blue / 256;
+
+  pixbuf = gdk_pixbuf_new (gdk_pixbuf_get_colorspace (orig), gdk_pixbuf_get_has_alpha (orig),
+			   gdk_pixbuf_get_bits_per_sample (orig),
+			   gdk_pixbuf_get_width (orig), gdk_pixbuf_get_height (orig));
+  
+  for (y = 0; y < gdk_pixbuf_get_height (pixbuf); y++)
+    {
+      src = gdk_pixbuf_get_pixels (orig) + y * gdk_pixbuf_get_rowstride (orig);
+      dest = gdk_pixbuf_get_pixels (pixbuf) + y * gdk_pixbuf_get_rowstride (pixbuf);
+
+      for (x = 0; x < gdk_pixbuf_get_width (pixbuf); x++) {
+
+	intensity = INTENSITY (src[0], src[1], src[2]) / 255.0;
+	
+	dest[0] = (guchar)(r * intensity);
+	dest[1] = g * intensity;
+	dest[2] = b * intensity;
+
+	if (gdk_pixbuf_get_has_alpha (orig))
+	  dest[3] = src[3];
+
+	src += gdk_pixbuf_get_has_alpha (orig) ? 4 : 3;
+	dest += gdk_pixbuf_get_has_alpha (pixbuf) ? 4 : 3;
+      }
+    }
+
+  return pixbuf;
+}
 
 static void
 color_composite (const GdkColor *bg,
@@ -1088,6 +1130,7 @@ pos_tokenize (const char  *expr,
 
         case ' ':
         case '\t':
+        case '\n':		
           break;
 
         default:
@@ -2106,6 +2149,8 @@ meta_draw_op_free (MetaDrawOp *op)
     case META_DRAW_IMAGE:
       if (op->data.image.pixbuf)
         g_object_unref (G_OBJECT (op->data.image.pixbuf));
+      if (op->data.image.colorize_spec)
+	meta_color_spec_free (op->data.image.colorize_spec);
       g_free (op->data.image.x);
       g_free (op->data.image.y);
       g_free (op->data.image.width);
@@ -2395,14 +2440,32 @@ draw_op_as_pixbuf (const MetaDrawOp    *op,
       }
       break;
 
+      
     case META_DRAW_IMAGE:
       {
-        pixbuf = scale_and_alpha_pixbuf (op->data.image.pixbuf,
-                                         op->data.image.alpha,
-                                         width, height);
-      }
-      break;
+	if (op->data.image.colorize_spec)
+	  {
+	    GdkPixbuf *tmp_pixbuf;
+	    GdkColor color;
 
+	     meta_color_spec_render (op->data.image.colorize_spec,
+				     widget, &color);
+	     tmp_pixbuf = colorize_pixbuf (op->data.image.pixbuf,
+					   &color);
+
+	     pixbuf = scale_and_alpha_pixbuf (tmp_pixbuf,
+					      op->data.image.alpha,
+					      width, height);
+	     g_object_unref (tmp_pixbuf);
+	  }
+	else
+	  {
+	    pixbuf = scale_and_alpha_pixbuf (op->data.image.pixbuf,
+					     op->data.image.alpha,
+					     width, height);
+	  }
+      break;
+      }
       
     case META_DRAW_GTK_ARROW:
     case META_DRAW_GTK_BOX:

src/theme.h

@@ -253,6 +253,7 @@ struct _MetaDrawOp
     } gradient;
 
     struct {
+      MetaColorSpec *colorize_spec;
       GdkPixbuf *pixbuf;
       double alpha;
       char *x;