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/*
* 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;
}
}
}
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