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497 lines
13 KiB
C
497 lines
13 KiB
C
/* GStreamer
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* Copyright (C) <2014> Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "video-dither.h"
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#include "video-orc.h"
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/**
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* SECTION:gstvideodither
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* @title: GstVideoDither
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* @short_description: Utility object for dithering and quantizing lines of video
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*
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* GstVideoDither provides implementations of several dithering algorithms
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* that can be applied to lines of video pixels to quantize and dither them.
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*
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*/
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struct _GstVideoDither
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{
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GstVideoDitherMethod method;
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GstVideoDitherFlags flags;
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GstVideoFormat format;
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guint width;
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guint depth;
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guint n_comp;
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void (*func) (GstVideoDither * dither, gpointer pixels, guint x, guint y,
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guint width);
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guint8 shift[4];
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guint16 mask[4];
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guint64 orc_mask64;
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guint32 orc_mask32;
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gpointer errors;
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};
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static void
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dither_none_u8_mask (GstVideoDither * dither, gpointer pixels, guint x, guint y,
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guint width)
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{
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guint8 *p = pixels;
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video_orc_dither_none_4u8_mask (p + (x * 4), dither->orc_mask32, width);
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}
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static void
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dither_none_u16_mask (GstVideoDither * dither, gpointer pixels, guint x,
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guint y, guint width)
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{
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guint16 *p = pixels;
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video_orc_dither_none_4u16_mask (p + (x * 4), dither->orc_mask64, width);
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}
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static void
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dither_verterr_u8 (GstVideoDither * dither, gpointer pixels, guint x, guint y,
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guint width)
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{
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guint8 *p = pixels;
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guint16 *e = dither->errors;
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if (y == 0)
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memset (e + (x * 4), 0, width * 8);
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video_orc_dither_verterr_4u8_mask (p + (x * 4), e + (x * 4),
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dither->orc_mask64, width);
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}
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static void
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dither_verterr_u16 (GstVideoDither * dither, gpointer pixels, guint x, guint y,
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guint width)
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{
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guint16 *p = pixels;
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guint16 *e = dither->errors;
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if (y == 0)
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memset (e + (x * 4), 0, width * 8);
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{
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gint i, end;
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guint16 *m = dither->mask;
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guint32 v, mp;
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end = (width + x) * 4;
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for (i = x * 4; i < end; i++) {
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mp = m[i & 3];
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v = p[i] + e[i];
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/* take new error and store */
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e[i] = v & mp;
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/* quantize and store */
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v &= ~mp;
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p[i] = MIN (v, 65535);
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}
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}
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}
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static void
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dither_floyd_steinberg_u8 (GstVideoDither * dither, gpointer pixels, guint x,
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guint y, guint width)
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{
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guint8 *p = pixels;
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guint16 *e = dither->errors;
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if (y == 0)
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memset (e + (x * 4), 0, (width + 1) * 8);
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/* add and multiply errors from previous line */
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video_orc_dither_fs_muladd_u8 (e + x * 4, width * 4);
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#if 1
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{
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gint i, end;
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guint16 *m = dither->mask, mp;
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guint16 v;
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end = (width + x) * 4;
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for (i = x * 4; i < end; i++) {
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mp = m[i & 3];
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v = p[i] + ((7 * e[i] + e[i + 4]) >> 4);
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/* take new error and store */
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e[i + 4] = v & mp;
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/* quantize and store */
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v &= ~mp;
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p[i] = MIN (v, 255);
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}
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}
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#else
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video_orc_dither_fs_add_4u8 (p, e + x * 4, e + (x + 1) * 4,
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dither->orc_mask64, width);
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#endif
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}
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static void
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dither_floyd_steinberg_u16 (GstVideoDither * dither, gpointer pixels, guint x,
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guint y, guint width)
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{
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guint16 *p = pixels;
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guint16 *e = dither->errors;
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if (y == 0)
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memset (e + (x * 4), 0, (width + 1) * 8);
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{
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gint i, end;
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guint16 *m = dither->mask, mp;
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guint32 v;
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end = (width + x) * 4;
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for (i = x * 4; i < end; i++) {
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mp = m[i & 3];
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/* apply previous errors to pixel */
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v = p[i] + ((7 * e[i] + e[i + 4] + 5 * e[i + 8] + 3 * e[i + 12]) >> 4);
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/* take new error and store */
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e[i + 4] = v & mp;
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/* quantize and store */
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v &= ~mp;
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p[i] = MIN (v, 65535);
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}
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}
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}
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static void
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dither_sierra_lite_u8 (GstVideoDither * dither, gpointer pixels, guint x,
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guint y, guint width)
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{
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guint8 *p = pixels;
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guint16 *e = dither->errors;
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gint i, end;
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guint16 *m = dither->mask, mp;
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guint16 v;
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if (y == 0)
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memset (e + (x * 4), 0, (width + 4) * 8);
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end = (width + x) * 4;
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for (i = x; i < end; i++) {
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mp = m[i & 3];
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/* apply previous errors to pixel */
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v = p[i] + ((2 * e[i] + e[i + 8] + e[i + 12]) >> 2);
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/* store new error */
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e[i + 4] = v & mp;
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/* quantize and store */
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v &= ~mp;
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p[i] = MIN (v, 255);
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}
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}
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static void
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dither_sierra_lite_u16 (GstVideoDither * dither, gpointer pixels, guint x,
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guint y, guint width)
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{
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guint16 *p = pixels;
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guint16 *e = dither->errors;
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gint i, end;
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guint16 *m = dither->mask, mp;
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guint32 v;
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if (y == 0)
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memset (e + (x * 4), 0, (width + 4) * 8);
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end = (width + x) * 4;
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for (i = x; i < end; i++) {
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mp = m[i & 3];
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/* apply previous errors to pixel */
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v = p[i] + ((2 * e[i] + e[i + 8] + e[i + 12]) >> 2);
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/* store new error */
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e[i + 4] = v & mp;
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/* quantize and store */
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v &= ~mp;
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p[i] = MIN (v & ~mp, 65535);
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}
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}
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static const guint16 bayer_map[16][16] = {
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{0, 128, 32, 160, 8, 136, 40, 168, 2, 130, 34, 162, 10, 138, 42, 170},
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{192, 64, 224, 96, 200, 72, 232, 104, 194, 66, 226, 98, 202, 74, 234, 106},
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{48, 176, 16, 144, 56, 184, 24, 152, 50, 178, 18, 146, 58, 186, 26, 154},
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{240, 112, 208, 80, 248, 120, 216, 88, 242, 114, 210, 82, 250, 122, 218, 90},
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{12, 240, 44, 172, 4, 132, 36, 164, 14, 242, 46, 174, 6, 134, 38, 166},
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{204, 76, 236, 108, 196, 68, 228, 100, 206, 78, 238, 110, 198, 70, 230, 102},
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{60, 188, 28, 156, 52, 180, 20, 148, 62, 190, 30, 158, 54, 182, 22, 150},
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{252, 142, 220, 92, 244, 116, 212, 84, 254, 144, 222, 94, 246, 118, 214, 86},
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{3, 131, 35, 163, 11, 139, 43, 171, 1, 129, 33, 161, 9, 137, 41, 169},
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{195, 67, 227, 99, 203, 75, 235, 107, 193, 65, 225, 97, 201, 73, 233, 105},
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{51, 179, 19, 147, 59, 187, 27, 155, 49, 177, 17, 145, 57, 185, 25, 153},
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{243, 115, 211, 83, 251, 123, 219, 91, 241, 113, 209, 81, 249, 121, 217, 89},
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{15, 243, 47, 175, 7, 135, 39, 167, 13, 241, 45, 173, 5, 133, 37, 165},
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{207, 79, 239, 111, 199, 71, 231, 103, 205, 77, 237, 109, 197, 69, 229, 101},
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{63, 191, 31, 159, 55, 183, 23, 151, 61, 189, 29, 157, 53, 181, 21, 149},
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{255, 145, 223, 95, 247, 119, 215, 87, 253, 143, 221, 93, 245, 117, 213, 85}
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};
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static void
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dither_ordered_u8 (GstVideoDither * dither, gpointer pixels, guint x, guint y,
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guint width)
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{
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guint8 *p = pixels;
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guint8 *c = (guint8 *) dither->errors + ((y & 15) * width + (x & 15)) * 4;
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video_orc_dither_ordered_u8 (p, c, width * 4);
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}
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static void
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dither_ordered_u8_mask (GstVideoDither * dither, gpointer pixels, guint x,
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guint y, guint width)
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{
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guint8 *p = pixels;
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guint16 *c = (guint16 *) dither->errors + ((y & 15) * width + (x & 15)) * 4;
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video_orc_dither_ordered_4u8_mask (p, c, dither->orc_mask64, width);
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}
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static void
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dither_ordered_u16_mask (GstVideoDither * dither, gpointer pixels, guint x,
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guint y, guint width)
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{
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guint16 *p = pixels;
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guint16 *c = (guint16 *) dither->errors + ((y & 15) * width + (x & 15)) * 4;
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video_orc_dither_ordered_4u16_mask (p, c, dither->orc_mask64, width);
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}
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static void
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alloc_errors (GstVideoDither * dither, guint lines)
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{
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guint width, n_comp;
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width = dither->width;
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n_comp = dither->n_comp;
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dither->errors = g_malloc0 (sizeof (guint16) * (width + 8) * n_comp * lines);
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}
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static void
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setup_bayer (GstVideoDither * dither)
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{
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guint i, j, k, width, n_comp, errdepth;
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guint8 *shift;
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width = dither->width;
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shift = dither->shift;
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n_comp = dither->n_comp;
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if (dither->depth == 8) {
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if (dither->flags & GST_VIDEO_DITHER_FLAG_QUANTIZE) {
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dither->func = dither_ordered_u8_mask;
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errdepth = 16;
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} else {
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dither->func = dither_ordered_u8;
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errdepth = 8;
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}
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} else {
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dither->func = dither_ordered_u16_mask;
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errdepth = 16;
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}
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alloc_errors (dither, 16);
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if (errdepth == 8) {
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for (i = 0; i < 16; i++) {
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guint8 *p = (guint8 *) dither->errors + (n_comp * width * i), v;
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for (j = 0; j < width; j++) {
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for (k = 0; k < n_comp; k++) {
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v = bayer_map[i & 15][j & 15];
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if (shift[k] < 8)
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v = v >> (8 - shift[k]);
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p[n_comp * j + k] = v;
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}
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}
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}
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} else {
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for (i = 0; i < 16; i++) {
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guint16 *p = (guint16 *) dither->errors + (n_comp * width * i), v;
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for (j = 0; j < width; j++) {
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for (k = 0; k < n_comp; k++) {
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v = bayer_map[i & 15][j & 15];
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if (shift[k] < 8)
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v = v >> (8 - shift[k]);
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p[n_comp * j + k] = v;
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}
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}
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}
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}
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}
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static gint
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count_power (guint v)
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{
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gint res = 0;
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while (v > 1) {
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res++;
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v >>= 1;
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}
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return res;
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}
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/**
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* gst_video_dither_new: (skip)
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* @method: a #GstVideoDitherMethod
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* @flags: a #GstVideoDitherFlags
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* @format: a #GstVideoFormat
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* @quantizer: quantizer
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* @width: the width of the lines
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*
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* Make a new dither object for dithering lines of @format using the
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* algorithm described by @method.
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*
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* Each component will be quantized to a multiple of @quantizer. Better
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* performance is achived when @quantizer is a power of 2.
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*
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* @width is the width of the lines that this ditherer will handle.
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*
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* Returns: a new #GstVideoDither
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*/
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GstVideoDither *
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gst_video_dither_new (GstVideoDitherMethod method, GstVideoDitherFlags flags,
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GstVideoFormat format, guint quantizer[GST_VIDEO_MAX_COMPONENTS],
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guint width)
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{
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GstVideoDither *dither;
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gint i;
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dither = g_slice_new0 (GstVideoDither);
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dither->method = method;
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dither->flags = flags;
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dither->format = format;
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dither->width = width;
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dither->n_comp = 4;
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switch (format) {
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case GST_VIDEO_FORMAT_AYUV:
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case GST_VIDEO_FORMAT_ARGB:
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dither->depth = 8;
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break;
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case GST_VIDEO_FORMAT_AYUV64:
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case GST_VIDEO_FORMAT_ARGB64:
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dither->depth = 16;
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break;
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default:
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g_slice_free (GstVideoDither, dither);
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g_return_val_if_reached (NULL);
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break;
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}
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for (i = 0; i < 4; i++) {
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/* FIXME, only power of 2 quantizers */
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guint q = quantizer[(i + 3) & 3];
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dither->shift[i] = count_power (q);
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dither->mask[i] = (1 << dither->shift[i]) - 1;
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GST_DEBUG ("%d: quant %d shift %d mask %08x", i, q, dither->shift[i],
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dither->mask[i]);
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dither->orc_mask64 =
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(dither->orc_mask64 << 16) | GUINT16_FROM_BE (dither->mask[i]);
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dither->orc_mask32 = (dither->orc_mask32 << 8) | (guint8) dither->mask[i];
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}
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dither->orc_mask64 = GUINT64_FROM_BE (dither->orc_mask64);
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dither->orc_mask32 = GUINT32_FROM_BE (dither->orc_mask32);
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GST_DEBUG ("mask64 %08" G_GINT64_MODIFIER "x", (guint64) dither->orc_mask64);
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GST_DEBUG ("mask32 %08x", dither->orc_mask32);
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switch (method) {
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case GST_VIDEO_DITHER_NONE:
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if (dither->flags & GST_VIDEO_DITHER_FLAG_QUANTIZE)
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if (dither->depth == 8)
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dither->func = dither_none_u8_mask;
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else
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dither->func = dither_none_u16_mask;
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else
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dither->func = NULL;
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break;
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case GST_VIDEO_DITHER_VERTERR:
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alloc_errors (dither, 1);
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if (dither->depth == 8) {
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dither->func = dither_verterr_u8;
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} else
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dither->func = dither_verterr_u16;
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break;
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case GST_VIDEO_DITHER_FLOYD_STEINBERG:
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alloc_errors (dither, 1);
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if (dither->depth == 8) {
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dither->func = dither_floyd_steinberg_u8;
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} else
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dither->func = dither_floyd_steinberg_u16;
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break;
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case GST_VIDEO_DITHER_SIERRA_LITE:
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alloc_errors (dither, 1);
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if (dither->depth == 8) {
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dither->func = dither_sierra_lite_u8;
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} else
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dither->func = dither_sierra_lite_u16;
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break;
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case GST_VIDEO_DITHER_BAYER:
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setup_bayer (dither);
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break;
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}
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return dither;
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}
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/**
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* gst_video_dither_free:
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* @dither: a #GstVideoDither
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*
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* Free @dither
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*/
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void
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gst_video_dither_free (GstVideoDither * dither)
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{
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g_return_if_fail (dither != NULL);
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g_free (dither->errors);
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g_slice_free (GstVideoDither, dither);
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}
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/**
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* gst_video_dither_line:
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* @dither: a #GstVideoDither
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* @line: pointer to the pixels of the line
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* @x: x coordinate
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* @y: y coordinate
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* @width: the width
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*
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* Dither @width pixels starting from offset @x in @line using @dither.
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*
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* @y is the line number of @line in the output image.
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*/
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void
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gst_video_dither_line (GstVideoDither * dither, gpointer line, guint x, guint y,
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guint width)
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{
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g_return_if_fail (dither != NULL);
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g_return_if_fail (x + width <= dither->width);
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if (dither->func)
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dither->func (dither, line, x, y, width);
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}
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