1 files changed, 95 insertions, 0 deletions
diff --git a/gst/videomixer/blend_bgra.c b/gst/videomixer/blend_bgra.c
new file mode 100644
index 00000000..3fc44dd4
--- /dev/null
+++ b/gst/videomixer/blend_bgra.c
@@ -0,0 +1,95 @@
+/* 
+ * Copyright (C) 2009 Alex Ugarte <augarte@vicomtech.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library 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 <gst/gst.h>
+
+#include <cairo.h>
+
+void
+gst_videomixer_blend_bgra_bgra (guint8 * src, gint xpos, gint ypos,
+    gint src_width, gint src_height, gdouble src_alpha,
+    guint8 * dest, gint dest_width, gint dest_height)
+{
+  cairo_surface_t *srcSurface = 0;
+  cairo_surface_t *destSurface = 0;
+  cairo_t *cairo = 0;
+
+  srcSurface =
+      cairo_image_surface_create_for_data (src, CAIRO_FORMAT_ARGB32, src_width,
+      src_height, src_width * 4);
+  g_assert (srcSurface);
+  destSurface =
+      cairo_image_surface_create_for_data (dest, CAIRO_FORMAT_ARGB32,
+      dest_width, dest_height, dest_width * 4);
+  g_assert (destSurface);
+  cairo = cairo_create (destSurface);
+  g_assert (cairo);
+
+  //copy source buffer in destiation
+  cairo_translate (cairo, xpos, ypos);
+  cairo_set_source_surface (cairo, srcSurface, 0, 0);
+  cairo_paint (cairo);
+
+  cairo_surface_finish (srcSurface);
+  cairo_surface_finish (destSurface);
+  cairo_surface_destroy (srcSurface);
+  cairo_surface_destroy (destSurface);
+  cairo_destroy (cairo);
+
+}
+
+/* fill a buffer with a checkerboard pattern */
+void
+gst_videomixer_fill_bgra_checker (guint8 * dest, gint width, gint height)
+{
+  gint i, j;
+  static int tab[] = { 80, 160, 80, 160 };
+
+  for (i = 0; i < height; i++) {
+    for (j = 0; j < width; j++) {
+      *dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)];       //blue
+      *dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)];       //green
+      *dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)];       //red    
+      *dest++ = 0xFF;           //alpha
+    }
+  }
+}
+
+void
+gst_videomixer_fill_bgra_color (guint8 * dest, gint width, gint height,
+    gint colY, gint colU, gint colV)
+{
+  gint red, green, blue;
+  gint i, j;
+
+//check this conversion 
+  red = 1.164 * (colY - 16) + 1.596 * (colV - 128);
+  green = 1.164 * (colY - 16) - 0.813 * (colV - 128) - 0.391 * (colU - 128);
+  blue = 1.164 * (colY - 16) + 2.018 * (colU - 128);
+
+
+  for (i = 0; i < height; i++) {
+    for (j = 0; j < width; j++) {
+      *dest++ = 0xff;
+      *dest++ = colY;
+      *dest++ = colU;
+      *dest++ = colV;
+    }
+  }
+}