gstreamer/gst-libs/gst/video/video-blend.h

77 lines
2.7 KiB
C

/* Gstreamer video blending utility functions
*
* Copyright (C) <2011> Intel Corporation
* Copyright (C) <2011> Collabora Ltd.
* Copyright (C) <2011> Thibault Saunier <thibault.saunier@collabora.com>
*
* 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.
*/
#ifndef __GST_VIDEO_BLEND__
#define __GST_VIDEO_BLEND__
#include <gst/gst.h>
#include <gst/video/video.h>
#define MAX_VIDEO_PLANES 4
typedef struct _GstBlendVideoFormatInfo GstBlendVideoFormatInfo;
/* GstBlendVideoFormatInfo:
* @fmt: The #GstVideoFormat describing the video format
* @width: The width of the video
* @height: The height of the video
* @pixels: The buffer containing the pixels of the video
* @size: The size in byte of @pixels
* @offset: The offsets of the different component of the video
* @stride: The stride of the different component of the video
*
* Information describing image properties containing necessary
* fields to do video blending.
*/
struct _GstBlendVideoFormatInfo
{
GstVideoFormat fmt;
gint width;
gint height;
guint8 * pixels;
gsize size;
gboolean premultiplied_alpha;
/* YUV components: Y=0, U=1, V=2, A=3
* RGB components: R=0, G=1, B=2, A=3 */
gint offset[MAX_VIDEO_PLANES];
gint stride[MAX_VIDEO_PLANES];
};
void video_blend_format_info_init (GstBlendVideoFormatInfo * info,
guint8 *pixels, guint height,
guint width, GstVideoFormat fmt,
gboolean premultiplied_alpha);
void video_blend_scale_linear_RGBA (GstBlendVideoFormatInfo * src,
gint dest_height, gint dest_width);
gboolean video_blend (GstBlendVideoFormatInfo * dest,
GstBlendVideoFormatInfo * src,
guint x, guint y,
gfloat global_alpha);
#endif