Optimize the case where a component is entirely transparent by skipping

Sun Jan 27 23:58:13 2002  Owen Taylor  <otaylor@redhat.com>

        * pixbuf-render.c (compute_hint): Optimize the case
        where a component is entirely transparent by skipping
        drawing it.

        * pixbuf-rc-style.c (theme_parse_image): Catch case
        where background or overlay border/stretch are specified
        without a background image.

        * pixbuf-render.c (theme_pixbuf_destroy): Actually free
        the structure and filename.

modules/engines/pixbuf/ChangeLog

@@ -1,3 +1,16 @@
+Sun Jan 27 23:58:13 2002  Owen Taylor  <otaylor@redhat.com>
+
+	* pixbuf-render.c (compute_hint): Optimize the case
+	where a component is entirely transparent by skipping
+	drawing it.
+
+	* pixbuf-rc-style.c (theme_parse_image): Catch case
+	where background or overlay border/stretch are specified
+	without a background image.
+
+	* pixbuf-render.c (theme_pixbuf_destroy): Actually free
+	the structure and filename.
+
 =================== Move back into gtk-engines ====================
 	
 Sat Jan 19 02:45:17 2002  Owen Taylor  <otaylor@redhat.com>

modules/engines/pixbuf/Makefile.am

@@ -14,3 +14,7 @@ libpixmap_la_SOURCES = 		\
 	pixbuf.h
 
 libpixmap_la_LDFLAGS =  -avoid-version -module
+
+dist-hook:
+	cp -pr examples $(distdir);					\
+        find $(distdir)/examples -name 'CVS' -print | xargs rm -rf 

modules/engines/pixbuf/pixbuf-draw.c

@@ -659,9 +659,10 @@ draw_box (GtkStyle     *style,
   match_data.state = state;
 
   if (!draw_simple_image (style, window, area, widget, &match_data, TRUE, TRUE,
-			  x, y, width, height))
+			  x, y, width, height)) {
     parent_class->draw_box (style, window, state, shadow, area, widget, detail,
 			    x, y, width, height);
+  }
 }
 
 static void

modules/engines/pixbuf/pixbuf-rc-style.c

@@ -664,6 +664,20 @@ theme_parse_image(GtkSettings  *settings,
 
   token = g_scanner_get_next_token(scanner);
 
+  if (data->background && !data->background->filename)
+    {
+      g_scanner_warn (scanner, "Background image options specified without filename");
+      theme_pixbuf_destroy (data->background);
+      data->background = NULL;
+    }
+
+  if (data->overlay && !data->overlay->filename)
+    {
+      g_scanner_warn (scanner, "Overlay image options specified without filename");
+      theme_pixbuf_destroy (data->overlay);
+      data->overlay = NULL;
+    }
+
   if (token != G_TOKEN_RIGHT_CURLY)
     {
       /* error - cleanup for exit */

modules/engines/pixbuf/pixbuf-render.c

@@ -180,6 +180,9 @@ pixbuf_render (GdkPixbuf    *src,
   rect.width = dest_width;
   rect.height = dest_height;
 
+  if (hints & THEME_MISSING)
+    return;
+
   /* FIXME: Because we use the mask to shape windows, we don't use
    * clip_rect to clip what we draw to the mask, only to clip
    * what we actually draw. But this leads to the horrible ineffiency
@@ -290,8 +293,8 @@ theme_pixbuf_new (void)
 void
 theme_pixbuf_destroy (ThemePixbuf *theme_pb)
 {
-  if (theme_pb->pixbuf)
-    g_cache_remove (pixbuf_cache, theme_pb->pixbuf);
+  theme_pixbuf_set_filename (theme_pb, NULL);
+  g_free (theme_pb);
 }
 
 void         
@@ -307,7 +310,10 @@ theme_pixbuf_set_filename (ThemePixbuf *theme_pb,
   if (theme_pb->filename)
     g_free (theme_pb->filename);
 
-  theme_pb->filename = g_strdup (filename);
+  if (filename)
+    theme_pb->filename = g_strdup (filename);
+  else
+    theme_pb->filename = NULL;
 }
 
 static guint
@@ -318,7 +324,7 @@ compute_hint (GdkPixbuf *pixbuf,
 	      gint       y1)
 {
   int i, j;
-  int hints = THEME_CONSTANT_ROWS | THEME_CONSTANT_COLS;
+  int hints = THEME_CONSTANT_ROWS | THEME_CONSTANT_COLS | THEME_MISSING;
   int n_channels = gdk_pixbuf_get_n_channels (pixbuf);
   
   guchar *data = gdk_pixbuf_get_pixels (pixbuf);
@@ -340,13 +346,21 @@ compute_hint (GdkPixbuf *pixbuf,
 
       for (j = x0 + 1; j < x1 ; j++)
 	{
+	  if (n_channels != 4 || p[4] != 0)
+	    {
+	      hints &= ~THEME_MISSING;
+	      if (!(hints & THEME_CONSTANT_ROWS))
+		goto cols;
+	    }
+	  
 	  if (r != *(p++) ||
 	      g != *(p++) ||
 	      b != *(p++) ||
-	      (n_channels == 4 && a != *(p++)))
+	      (n_channels != 4 && a != *(p++)))
 	    {
 	      hints &= ~THEME_CONSTANT_ROWS;
-	      goto cols;
+	      if (!(hints & THEME_MISSING))
+		goto cols;
 	    }
 	}
     }

modules/engines/pixbuf/pixbuf.h

@@ -121,7 +121,8 @@ typedef enum {
 
 typedef enum {
   THEME_CONSTANT_ROWS = 1 << 0,
-  THEME_CONSTANT_COLS = 1 << 1
+  THEME_CONSTANT_COLS = 1 << 1,
+  THEME_MISSING = 1 << 2
 } ThemeRenderHints;
 
 struct _ThemePixbuf