gstreamer/ext/gl/gstglalpha.h
Matthew Waters af5b0ee7d0 gl: add glalpha element that is similar to the alpha element
It performs similarly to the existing alpha element however performs
calculations in floating point rather than with small (guint8) integers
so some differences are to be expected.

https://bugzilla.gnome.org/show_bug.cgi?id=794070
2018-05-05 21:24:25 +10:00

104 lines
2.5 KiB
C

/* GStreamer
* Copyright (C) 2018 Matthew Waters <matthew@centricular.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_GL_ALPHA_H__
#define __GST_GL_ALPHA_H__
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/gl/gl.h>
G_BEGIN_DECLS
#define GST_TYPE_GL_ALPHA \
(gst_gl_alpha_get_type())
#define GST_GL_ALPHA(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_ALPHA,GstGLAlpha))
#define GST_GL_ALPHA_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GL_ALPHA,GstGLAlphaClass))
#define GST_IS_GL_ALPHA(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_ALPHA))
#define GST_IS_GL_ALPHA_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GL_ALPHA))
typedef struct _GstGLAlpha GstGLAlpha;
typedef struct _GstGLAlphaClass GstGLAlphaClass;
/**
* GstGLAlphaMethod:
* @ALPHA_METHOD_SET: Set/adjust alpha channel
* @ALPHA_METHOD_GREEN: Chroma Key green
* @ALPHA_METHOD_BLUE: Chroma Key blue
* @ALPHA_METHOD_CUSTOM: Chroma Key on target_r/g/b
*/
typedef enum
{
ALPHA_METHOD_SET,
ALPHA_METHOD_GREEN,
ALPHA_METHOD_BLUE,
ALPHA_METHOD_CUSTOM,
}
GstGLAlphaMethod;
/**
* GstGLAlpha:
*
* Opaque data structure.
*/
struct _GstGLAlpha {
GstGLFilter videofilter;
/* < private > */
GstGLShader *alpha_shader;
GstGLShader *chroma_key_shader;
/* properties */
gdouble alpha;
guint target_r;
guint target_g;
guint target_b;
GstGLAlphaMethod method;
gfloat angle;
gfloat noise_level;
guint black_sensitivity;
guint white_sensitivity;
/* precalculated values for chroma keying */
gfloat cb, cr;
gfloat kg;
gfloat accept_angle_tg;
gfloat accept_angle_ctg;
gfloat one_over_kc;
gfloat kfgy_scale;
gfloat noise_level2;
};
struct _GstGLAlphaClass {
GstGLFilterClass parent_class;
};
GType gst_gl_alpha_get_type(void);
G_END_DECLS
#endif /* __GST_GL_ALPHA_H__ */