From 198adc6861a9c012830c643269d73a879fcc5157 Mon Sep 17 00:00:00 2001
From: Tomeu Vizoso <tomeu@sugarlabs.org>
Date: Wed, 02 Dec 2009 17:08:31 +0000
Subject: Add sugar_cairo_surface_from_pixbuf to sugar-misc.c

---
diff --git a/src/sugar/Makefile.am b/src/sugar/Makefile.am
index 75bf407..47ae2a1 100644
--- a/src/sugar/Makefile.am
+++ b/src/sugar/Makefile.am
@@ -24,6 +24,7 @@ public_headers =			\
 	sugar-key-grabber.h		\
 	sugar-menu.h			\
 	sugar-grid.h			\
+	sugar-misc.h			\
 	sexy-icon-entry.h		\
 	eggsmclient.h			\
 	acme-volume.h			\
@@ -55,6 +56,7 @@ libsugarext_la_SOURCES =		\
 	sugar-address-entry.c		\
 	sugar-grid.c			\
 	sugar-key-grabber.c		\
+	sugar-misc.c			\
 	sugar-menu.c
 
 BUILT_SOURCES = 			\
@@ -72,6 +74,7 @@ sugar-marshal.h: sugar-marshal.list
 SugarExt-1.0.gir: $(INTROSPECTION_SCANNER) libsugarext.la
 	$(INTROSPECTION_SCANNER) -v \
 		--namespace SugarExt --nsversion=1.0 \
+		--strip-prefix=sugar \
 		--include=Gtk-2.0 \
 		--library=libsugarext.la \
 	        --library asound \
diff --git a/src/sugar/sugar-misc.c b/src/sugar/sugar-misc.c
new file mode 100644
index 0000000..1eb1b7e
--- /dev/null
+++ b/src/sugar/sugar-misc.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2009 Tomeu Vizoso
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "sugar-misc.h"
+
+cairo_surface_t*
+sugar_cairo_surface_from_pixbuf (GdkPixbuf *pixbuf)
+{
+/* Ripped from GooCanvas */
+  gint width = gdk_pixbuf_get_width (pixbuf);
+  gint height = gdk_pixbuf_get_height (pixbuf);
+  guchar *gdk_pixels = gdk_pixbuf_get_pixels (pixbuf);
+  int gdk_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+  int n_channels = gdk_pixbuf_get_n_channels (pixbuf);
+  guchar *cairo_pixels;
+  cairo_format_t format;
+  cairo_surface_t *surface;
+  static const cairo_user_data_key_t key;
+  int j;
+
+  if (n_channels == 3)
+    format = CAIRO_FORMAT_RGB24;
+  else
+    format = CAIRO_FORMAT_ARGB32;
+
+  cairo_pixels = g_malloc (4 * width * height);
+  surface = cairo_image_surface_create_for_data ((unsigned char *)cairo_pixels,
+						 format,
+						 width, height, 4 * width);
+  cairo_surface_set_user_data (surface, &key,
+			       cairo_pixels, (cairo_destroy_func_t)g_free);
+
+  for (j = height; j; j--)
+    {
+      guchar *p = gdk_pixels;
+      guchar *q = cairo_pixels;
+
+      if (n_channels == 3)
+	{
+	  guchar *end = p + 3 * width;
+	  
+	  while (p < end)
+	    {
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+	      q[0] = p[2];
+	      q[1] = p[1];
+	      q[2] = p[0];
+#else	  
+	      q[1] = p[0];
+	      q[2] = p[1];
+	      q[3] = p[2];
+#endif
+	      p += 3;
+	      q += 4;
+	    }
+	}
+      else
+	{
+	  guchar *end = p + 4 * width;
+	  guint t1,t2,t3;
+	    
+#define MULT(d,c,a,t) G_STMT_START { t = c * a; d = ((t >> 8) + t) >> 8; } G_STMT_END
+
+	  while (p < end)
+	    {
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+	      MULT(q[0], p[2], p[3], t1);
+	      MULT(q[1], p[1], p[3], t2);
+	      MULT(q[2], p[0], p[3], t3);
+	      q[3] = p[3];
+#else	  
+	      q[0] = p[3];
+	      MULT(q[1], p[0], p[3], t1);
+	      MULT(q[2], p[1], p[3], t2);
+	      MULT(q[3], p[2], p[3], t3);
+#endif
+	      
+	      p += 4;
+	      q += 4;
+	    }
+	  
+#undef MULT
+	}
+
+      gdk_pixels += gdk_rowstride;
+      cairo_pixels += 4 * width;
+    }
+
+  return surface;
+}
+
diff --git a/src/sugar/sugar-misc.h b/src/sugar/sugar-misc.h
new file mode 100644
index 0000000..3d08fc7
--- /dev/null
+++ b/src/sugar/sugar-misc.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2009 Tomeu Vizoso
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __SUGAR_MISC_H__
+#define __SUGAR_MISC_H__
+
+#include <gdk/gdk.h>
+#include <cairo.h>
+
+cairo_surface_t* sugar_cairo_surface_from_pixbuf (GdkPixbuf *pixbuf);
+
+#endif /* __SUGAR_MISC_H__ */
--
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