/* GStreamer

 * Copyright (C) <2014> Wim Taymans <wim.taymans@gmail.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_VIDEO_DITHER_H__

#define __GST_VIDEO_DITHER_H__

#include <gst/gst.h>

#include <gst/video/video-prelude.h>

G_BEGIN_DECLS

/**

 * GstVideoDitherMethod:

 * @GST_VIDEO_DITHER_NONE: no dithering

 * @GST_VIDEO_DITHER_VERTERR: propagate rounding errors downwards

 * @GST_VIDEO_DITHER_FLOYD_STEINBERG: Dither with floyd-steinberg error diffusion

 * @GST_VIDEO_DITHER_SIERRA_LITE: Dither with Sierra Lite error diffusion

 * @GST_VIDEO_DITHER_BAYER: ordered dither using a bayer pattern

 *

 * Different dithering methods to use.

 */

typedef enum {

  GST_VIDEO_DITHER_NONE,

  GST_VIDEO_DITHER_VERTERR,

  GST_VIDEO_DITHER_FLOYD_STEINBERG,

  GST_VIDEO_DITHER_SIERRA_LITE,

  GST_VIDEO_DITHER_BAYER,

} GstVideoDitherMethod;

/**

 * GstVideoDitherFlags:

 * @GST_VIDEO_DITHER_FLAG_NONE: no flags

 * @GST_VIDEO_DITHER_FLAG_INTERLACED: the input is interlaced

 * @GST_VIDEO_DITHER_FLAG_QUANTIZE: quantize values in addition to adding dither.

 *

 * Extra flags that influence the result from gst_video_chroma_resample_new().

 */

typedef enum {

  GST_VIDEO_DITHER_FLAG_NONE       = 0,

  GST_VIDEO_DITHER_FLAG_INTERLACED = (1 << 0),

  GST_VIDEO_DITHER_FLAG_QUANTIZE   = (1 << 1),

} GstVideoDitherFlags;

typedef struct _GstVideoDither GstVideoDither;

/* circular dependency, need to include this after defining the enums */

#include <gst/video/video-format.h>

GST_VIDEO_API

GstVideoDither    * gst_video_dither_new      (GstVideoDitherMethod method,

                                               GstVideoDitherFlags flags,

                                               GstVideoFormat format,

                                               guint quantizer[GST_VIDEO_MAX_COMPONENTS],

                                               guint width);

GST_VIDEO_API

void                gst_video_dither_free     (GstVideoDither *dither);

GST_VIDEO_API

void                gst_video_dither_line     (GstVideoDither *dither,

                                               gpointer line, guint x, guint y, guint width);

G_END_DECLS

#endif /* __GST_VIDEO_DITHER_H__ */