d312a33ed2
The code above this does a whitelist on desc->flags, which now includes the (disallowed) AV_PIX_FMT_FLAG_XYZ for XYZ formats. So there is no more need for a separate check, here.
660 lines
24 KiB
C
660 lines
24 KiB
C
/*
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* Copyright 2011 Stefano Sabatini <stefano.sabatini-lala poste it>
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* Copyright 2012 Nicolas George <nicolas.george normalesup org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include "libavutil/avassert.h"
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#include "libavutil/avutil.h"
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#include "libavutil/csp.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/pixdesc.h"
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#include "colorspace.h"
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#include "drawutils.h"
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#include "formats.h"
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enum { RED = 0, GREEN, BLUE, ALPHA };
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int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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if (!(desc->flags & AV_PIX_FMT_FLAG_RGB))
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return AVERROR(EINVAL);
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if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM)
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return AVERROR(EINVAL);
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av_assert0(desc->nb_components == 3 + !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA));
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if (desc->flags & AV_PIX_FMT_FLAG_PLANAR) {
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rgba_map[RED] = desc->comp[0].plane;
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rgba_map[GREEN] = desc->comp[1].plane;
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rgba_map[BLUE] = desc->comp[2].plane;
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rgba_map[ALPHA] = (desc->flags & AV_PIX_FMT_FLAG_ALPHA) ? desc->comp[3].plane : 3;
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} else {
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int had0 = 0;
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unsigned depthb = 0;
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unsigned i;
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for (i = 0; i < desc->nb_components; i++) {
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/* all components must have same depth in bytes */
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unsigned db = (desc->comp[i].depth + 7) / 8;
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unsigned pos = desc->comp[i].offset / db;
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if (depthb && (depthb != db))
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return AVERROR(ENOSYS);
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if (desc->comp[i].offset % db)
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return AVERROR(ENOSYS);
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had0 |= pos == 0;
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rgba_map[i] = pos;
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}
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if (desc->nb_components == 3)
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rgba_map[ALPHA] = had0 ? 3 : 0;
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}
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av_assert0(rgba_map[RED] != rgba_map[GREEN]);
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av_assert0(rgba_map[GREEN] != rgba_map[BLUE]);
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av_assert0(rgba_map[BLUE] != rgba_map[RED]);
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av_assert0(rgba_map[RED] != rgba_map[ALPHA]);
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av_assert0(rgba_map[GREEN] != rgba_map[ALPHA]);
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av_assert0(rgba_map[BLUE] != rgba_map[ALPHA]);
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return 0;
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}
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int ff_draw_init2(FFDrawContext *draw, enum AVPixelFormat format, enum AVColorSpace csp,
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enum AVColorRange range, unsigned flags)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
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const AVLumaCoefficients *luma = NULL;
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const AVComponentDescriptor *c;
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unsigned i, nb_planes = 0;
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int pixelstep[MAX_PLANES] = { 0 };
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int depthb = 0;
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if (!desc || !desc->name)
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return AVERROR(EINVAL);
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if (desc->flags & AV_PIX_FMT_FLAG_BE)
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return AVERROR(ENOSYS);
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if (desc->flags & ~(AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_RGB | AV_PIX_FMT_FLAG_ALPHA))
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return AVERROR(ENOSYS);
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if (csp == AVCOL_SPC_UNSPECIFIED)
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csp = (desc->flags & AV_PIX_FMT_FLAG_RGB) ? AVCOL_SPC_RGB : AVCOL_SPC_SMPTE170M;
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if (!(desc->flags & AV_PIX_FMT_FLAG_RGB) && !(luma = av_csp_luma_coeffs_from_avcsp(csp)))
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return AVERROR(EINVAL);
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if (range == AVCOL_RANGE_UNSPECIFIED)
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range = (format == AV_PIX_FMT_YUVJ420P || format == AV_PIX_FMT_YUVJ422P ||
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format == AV_PIX_FMT_YUVJ444P || format == AV_PIX_FMT_YUVJ411P ||
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format == AV_PIX_FMT_YUVJ440P || csp == AVCOL_SPC_RGB)
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? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
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if (range != AVCOL_RANGE_JPEG && range != AVCOL_RANGE_MPEG)
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return AVERROR(EINVAL);
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for (i = 0; i < desc->nb_components; i++) {
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int db;
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c = &desc->comp[i];
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/* for now, only 8-16 bits formats */
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if (c->depth < 8 || c->depth > 16)
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return AVERROR(ENOSYS);
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if (c->plane >= MAX_PLANES)
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return AVERROR(ENOSYS);
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/* data must either be in the high or low bits, never middle */
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if (c->shift && ((c->shift + c->depth) & 0x7))
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return AVERROR(ENOSYS);
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/* mixed >8 and <=8 depth */
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db = (c->depth + 7) / 8;
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if (depthb && (depthb != db))
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return AVERROR(ENOSYS);
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depthb = db;
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if (db * (c->offset + 1) > 16)
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return AVERROR(ENOSYS);
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if (c->offset % db)
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return AVERROR(ENOSYS);
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/* strange interleaving */
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if (pixelstep[c->plane] != 0 &&
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pixelstep[c->plane] != c->step)
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return AVERROR(ENOSYS);
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pixelstep[c->plane] = c->step;
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if (pixelstep[c->plane] >= 8)
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return AVERROR(ENOSYS);
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nb_planes = FFMAX(nb_planes, c->plane + 1);
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}
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memset(draw, 0, sizeof(*draw));
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draw->desc = desc;
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draw->format = format;
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draw->nb_planes = nb_planes;
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draw->range = range;
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draw->csp = csp;
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draw->flags = flags;
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if (luma)
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ff_fill_rgb2yuv_table(luma, draw->rgb2yuv);
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memcpy(draw->pixelstep, pixelstep, sizeof(draw->pixelstep));
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draw->hsub[1] = draw->hsub[2] = draw->hsub_max = desc->log2_chroma_w;
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draw->vsub[1] = draw->vsub[2] = draw->vsub_max = desc->log2_chroma_h;
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return 0;
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}
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int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
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{
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return ff_draw_init2(draw, format, AVCOL_SPC_UNSPECIFIED, AVCOL_RANGE_UNSPECIFIED, flags);
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}
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void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
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{
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unsigned i;
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double yuvad[4];
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double rgbad[4];
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const AVPixFmtDescriptor *desc = draw->desc;
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if (rgba != color->rgba)
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memcpy(color->rgba, rgba, sizeof(color->rgba));
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memset(color->comp, 0, sizeof(color->comp));
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for (int i = 0; i < 4; i++)
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rgbad[i] = color->rgba[i] / 255.;
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if (draw->desc->flags & AV_PIX_FMT_FLAG_RGB)
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memcpy(yuvad, rgbad, sizeof(double) * 3);
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else
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ff_matrix_mul_3x3_vec(yuvad, rgbad, draw->rgb2yuv);
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yuvad[3] = rgbad[3];
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for (int i = 0; i < 3; i++) {
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int chroma = (!(draw->desc->flags & AV_PIX_FMT_FLAG_RGB) && i > 0);
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if (draw->range == AVCOL_RANGE_MPEG) {
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yuvad[i] *= (chroma ? 224. : 219.) / 255.;
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yuvad[i] += (chroma ? 128. : 16.) / 255.;
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} else if (chroma) {
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yuvad[i] += 0.5;
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}
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}
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// Ensure we place the alpha appropriately for gray formats
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if (desc->nb_components <= 2)
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yuvad[1] = yuvad[3];
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for (i = 0; i < desc->nb_components; i++) {
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unsigned val = yuvad[i] * ((1 << (draw->desc->comp[i].depth + draw->desc->comp[i].shift)) - 1) + 0.5;
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if (desc->comp[i].depth > 8)
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color->comp[desc->comp[i].plane].u16[desc->comp[i].offset / 2] = val;
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else
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color->comp[desc->comp[i].plane].u8[desc->comp[i].offset] = val;
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}
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}
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static uint8_t *pointer_at(FFDrawContext *draw, uint8_t *data[], int linesize[],
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int plane, int x, int y)
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{
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return data[plane] +
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(y >> draw->vsub[plane]) * linesize[plane] +
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(x >> draw->hsub[plane]) * draw->pixelstep[plane];
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}
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void ff_copy_rectangle2(FFDrawContext *draw,
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uint8_t *dst[], int dst_linesize[],
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uint8_t *src[], int src_linesize[],
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int dst_x, int dst_y, int src_x, int src_y,
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int w, int h)
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{
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int plane, y, wp, hp;
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uint8_t *p, *q;
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for (plane = 0; plane < draw->nb_planes; plane++) {
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p = pointer_at(draw, src, src_linesize, plane, src_x, src_y);
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q = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
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wp = AV_CEIL_RSHIFT(w, draw->hsub[plane]) * draw->pixelstep[plane];
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hp = AV_CEIL_RSHIFT(h, draw->vsub[plane]);
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for (y = 0; y < hp; y++) {
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memcpy(q, p, wp);
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p += src_linesize[plane];
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q += dst_linesize[plane];
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}
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}
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}
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void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color,
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uint8_t *dst[], int dst_linesize[],
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int dst_x, int dst_y, int w, int h)
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{
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int plane, x, y, wp, hp;
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uint8_t *p0, *p;
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FFDrawColor color_tmp = *color;
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for (plane = 0; plane < draw->nb_planes; plane++) {
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p0 = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
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wp = AV_CEIL_RSHIFT(w, draw->hsub[plane]);
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hp = AV_CEIL_RSHIFT(h, draw->vsub[plane]);
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if (!hp)
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return;
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p = p0;
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if (HAVE_BIGENDIAN && draw->desc->comp[0].depth > 8) {
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for (x = 0; 2*x < draw->pixelstep[plane]; x++)
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color_tmp.comp[plane].u16[x] = av_bswap16(color_tmp.comp[plane].u16[x]);
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}
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/* copy first line from color */
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for (x = 0; x < wp; x++) {
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memcpy(p, color_tmp.comp[plane].u8, draw->pixelstep[plane]);
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p += draw->pixelstep[plane];
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}
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wp *= draw->pixelstep[plane];
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/* copy next lines from first line */
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p = p0 + dst_linesize[plane];
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for (y = 1; y < hp; y++) {
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memcpy(p, p0, wp);
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p += dst_linesize[plane];
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}
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}
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}
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/**
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* Clip interval [x; x+w[ within [0; wmax[.
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* The resulting w may be negative if the final interval is empty.
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* dx, if not null, return the difference between in and out value of x.
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*/
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static void clip_interval(int wmax, int *x, int *w, int *dx)
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{
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if (dx)
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*dx = 0;
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if (*x < 0) {
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if (dx)
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*dx = -*x;
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*w += *x;
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*x = 0;
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}
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if (*x + *w > wmax)
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*w = wmax - *x;
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}
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/**
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* Decompose w pixels starting at x
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* into start + (w starting at x) + end
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* with x and w aligned on multiples of 1<<sub.
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*/
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static void subsampling_bounds(int sub, int *x, int *w, int *start, int *end)
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{
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int mask = (1 << sub) - 1;
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*start = (-*x) & mask;
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*x += *start;
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*start = FFMIN(*start, *w);
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*w -= *start;
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*end = *w & mask;
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*w >>= sub;
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}
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/* If alpha is in the [ 0 ; 0x1010101 ] range,
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then alpha * value is in the [ 0 ; 0xFFFFFFFF ] range,
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and >> 24 gives a correct rounding. */
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static void blend_line(uint8_t *dst, unsigned src, unsigned alpha,
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int dx, int w, unsigned hsub, int left, int right)
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{
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unsigned asrc = alpha * src;
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unsigned tau = 0x1010101 - alpha;
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int x;
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if (left) {
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unsigned suba = (left * alpha) >> hsub;
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*dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
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dst += dx;
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}
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for (x = 0; x < w; x++) {
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*dst = (*dst * tau + asrc) >> 24;
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dst += dx;
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}
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if (right) {
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unsigned suba = (right * alpha) >> hsub;
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*dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
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}
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}
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static void blend_line16(uint8_t *dst, unsigned src, unsigned alpha,
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int dx, int w, unsigned hsub, int left, int right)
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{
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unsigned asrc = alpha * src;
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unsigned tau = 0x10001 - alpha;
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int x;
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if (left) {
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unsigned suba = (left * alpha) >> hsub;
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uint16_t value = AV_RL16(dst);
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AV_WL16(dst, (value * (0x10001 - suba) + src * suba) >> 16);
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dst += dx;
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}
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for (x = 0; x < w; x++) {
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uint16_t value = AV_RL16(dst);
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AV_WL16(dst, (value * tau + asrc) >> 16);
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dst += dx;
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}
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if (right) {
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unsigned suba = (right * alpha) >> hsub;
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uint16_t value = AV_RL16(dst);
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AV_WL16(dst, (value * (0x10001 - suba) + src * suba) >> 16);
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}
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}
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void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color,
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uint8_t *dst[], int dst_linesize[],
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int dst_w, int dst_h,
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int x0, int y0, int w, int h)
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{
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unsigned alpha, nb_planes, nb_comp, plane, comp;
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int w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;
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uint8_t *p0, *p;
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nb_comp = draw->desc->nb_components -
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!!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));
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/* TODO optimize if alpha = 0xFF */
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clip_interval(dst_w, &x0, &w, NULL);
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clip_interval(dst_h, &y0, &h, NULL);
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if (w <= 0 || h <= 0 || !color->rgba[3])
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return;
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if (draw->desc->comp[0].depth <= 8) {
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/* 0x10203 * alpha + 2 is in the [ 2 ; 0x1010101 - 2 ] range */
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alpha = 0x10203 * color->rgba[3] + 0x2;
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} else {
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/* 0x101 * alpha is in the [ 2 ; 0x1001] range */
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alpha = 0x101 * color->rgba[3] + 0x2;
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}
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nb_planes = draw->nb_planes - !!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));
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nb_planes += !nb_planes;
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for (plane = 0; plane < nb_planes; plane++) {
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p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
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w_sub = w;
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h_sub = h;
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x_sub = x0;
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y_sub = y0;
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subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
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subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
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for (comp = 0; comp < nb_comp; comp++) {
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const int depth = draw->desc->comp[comp].depth;
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const int offset = draw->desc->comp[comp].offset;
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const int index = offset / ((depth + 7) / 8);
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if (draw->desc->comp[comp].plane != plane)
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continue;
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p = p0 + offset;
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if (top) {
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if (depth <= 8) {
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blend_line(p, color->comp[plane].u8[index], alpha >> 1,
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draw->pixelstep[plane], w_sub,
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draw->hsub[plane], left, right);
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} else {
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blend_line16(p, color->comp[plane].u16[index], alpha >> 1,
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draw->pixelstep[plane], w_sub,
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draw->hsub[plane], left, right);
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}
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p += dst_linesize[plane];
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}
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if (depth <= 8) {
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for (y = 0; y < h_sub; y++) {
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blend_line(p, color->comp[plane].u8[index], alpha,
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draw->pixelstep[plane], w_sub,
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draw->hsub[plane], left, right);
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p += dst_linesize[plane];
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}
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} else {
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for (y = 0; y < h_sub; y++) {
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blend_line16(p, color->comp[plane].u16[index], alpha,
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draw->pixelstep[plane], w_sub,
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draw->hsub[plane], left, right);
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p += dst_linesize[plane];
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}
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}
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if (bottom) {
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if (depth <= 8) {
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blend_line(p, color->comp[plane].u8[index], alpha >> 1,
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draw->pixelstep[plane], w_sub,
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draw->hsub[plane], left, right);
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} else {
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blend_line16(p, color->comp[plane].u16[index], alpha >> 1,
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draw->pixelstep[plane], w_sub,
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draw->hsub[plane], left, right);
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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 void blend_pixel16(uint8_t *dst, unsigned src, unsigned alpha,
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const uint8_t *mask, int mask_linesize, int l2depth,
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unsigned w, unsigned h, unsigned shift, unsigned xm0)
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{
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unsigned xm, x, y, t = 0;
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unsigned xmshf = 3 - l2depth;
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unsigned xmmod = 7 >> l2depth;
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unsigned mbits = (1 << (1 << l2depth)) - 1;
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unsigned mmult = 255 / mbits;
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uint16_t value = AV_RL16(dst);
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for (y = 0; y < h; y++) {
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xm = xm0;
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for (x = 0; x < w; x++) {
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t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)
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* mmult;
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xm++;
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}
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mask += mask_linesize;
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}
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alpha = (t >> shift) * alpha;
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AV_WL16(dst, ((0x10001 - alpha) * value + alpha * src) >> 16);
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}
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static void blend_pixel(uint8_t *dst, unsigned src, unsigned alpha,
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const uint8_t *mask, int mask_linesize, int l2depth,
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unsigned w, unsigned h, unsigned shift, unsigned xm0)
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{
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unsigned xm, x, y, t = 0;
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unsigned xmshf = 3 - l2depth;
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unsigned xmmod = 7 >> l2depth;
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unsigned mbits = (1 << (1 << l2depth)) - 1;
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unsigned mmult = 255 / mbits;
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for (y = 0; y < h; y++) {
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xm = xm0;
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for (x = 0; x < w; x++) {
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t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)
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* mmult;
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xm++;
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}
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mask += mask_linesize;
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}
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alpha = (t >> shift) * alpha;
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*dst = ((0x1010101 - alpha) * *dst + alpha * src) >> 24;
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}
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static void blend_line_hv16(uint8_t *dst, int dst_delta,
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unsigned src, unsigned alpha,
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const uint8_t *mask, int mask_linesize, int l2depth, int w,
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unsigned hsub, unsigned vsub,
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int xm, int left, int right, int hband)
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{
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int x;
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if (left) {
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blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,
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left, hband, hsub + vsub, xm);
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dst += dst_delta;
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xm += left;
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}
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for (x = 0; x < w; x++) {
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blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,
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1 << hsub, hband, hsub + vsub, xm);
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dst += dst_delta;
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xm += 1 << hsub;
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}
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if (right)
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blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,
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right, hband, hsub + vsub, xm);
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}
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static void blend_line_hv(uint8_t *dst, int dst_delta,
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unsigned src, unsigned alpha,
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const uint8_t *mask, int mask_linesize, int l2depth, int w,
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unsigned hsub, unsigned vsub,
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int xm, int left, int right, int hband)
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{
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int x;
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if (left) {
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blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
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left, hband, hsub + vsub, xm);
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dst += dst_delta;
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xm += left;
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}
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for (x = 0; x < w; x++) {
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blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
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1 << hsub, hband, hsub + vsub, xm);
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dst += dst_delta;
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xm += 1 << hsub;
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}
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if (right)
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blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
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right, hband, hsub + vsub, xm);
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}
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void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color,
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uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h,
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const uint8_t *mask, int mask_linesize, int mask_w, int mask_h,
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int l2depth, unsigned endianness, int x0, int y0)
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{
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unsigned alpha, nb_planes, nb_comp, plane, comp;
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int xm0, ym0, w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;
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uint8_t *p0, *p;
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const uint8_t *m;
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nb_comp = draw->desc->nb_components -
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!!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));
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clip_interval(dst_w, &x0, &mask_w, &xm0);
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clip_interval(dst_h, &y0, &mask_h, &ym0);
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mask += ym0 * mask_linesize;
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if (mask_w <= 0 || mask_h <= 0 || !color->rgba[3])
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return;
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if (draw->desc->comp[0].depth <= 8) {
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/* alpha is in the [ 0 ; 0x10203 ] range,
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alpha * mask is in the [ 0 ; 0x1010101 - 4 ] range */
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alpha = (0x10307 * color->rgba[3] + 0x3) >> 8;
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} else {
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alpha = (0x101 * color->rgba[3] + 0x2) >> 8;
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}
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nb_planes = draw->nb_planes - !!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));
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nb_planes += !nb_planes;
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for (plane = 0; plane < nb_planes; plane++) {
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p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
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w_sub = mask_w;
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h_sub = mask_h;
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x_sub = x0;
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y_sub = y0;
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subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
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subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
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for (comp = 0; comp < nb_comp; comp++) {
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const int depth = draw->desc->comp[comp].depth;
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const int offset = draw->desc->comp[comp].offset;
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const int index = offset / ((depth + 7) / 8);
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if (draw->desc->comp[comp].plane != plane)
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continue;
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p = p0 + offset;
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m = mask;
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if (top) {
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if (depth <= 8) {
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blend_line_hv(p, draw->pixelstep[plane],
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color->comp[plane].u8[index], alpha,
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m, mask_linesize, l2depth, w_sub,
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draw->hsub[plane], draw->vsub[plane],
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xm0, left, right, top);
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} else {
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blend_line_hv16(p, draw->pixelstep[plane],
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color->comp[plane].u16[index], alpha,
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m, mask_linesize, l2depth, w_sub,
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draw->hsub[plane], draw->vsub[plane],
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xm0, left, right, top);
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}
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p += dst_linesize[plane];
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m += top * mask_linesize;
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}
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if (depth <= 8) {
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for (y = 0; y < h_sub; y++) {
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blend_line_hv(p, draw->pixelstep[plane],
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color->comp[plane].u8[index], alpha,
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m, mask_linesize, l2depth, w_sub,
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draw->hsub[plane], draw->vsub[plane],
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xm0, left, right, 1 << draw->vsub[plane]);
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p += dst_linesize[plane];
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m += mask_linesize << draw->vsub[plane];
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}
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} else {
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for (y = 0; y < h_sub; y++) {
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blend_line_hv16(p, draw->pixelstep[plane],
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color->comp[plane].u16[index], alpha,
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m, mask_linesize, l2depth, w_sub,
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draw->hsub[plane], draw->vsub[plane],
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xm0, left, right, 1 << draw->vsub[plane]);
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p += dst_linesize[plane];
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m += mask_linesize << draw->vsub[plane];
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}
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}
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if (bottom) {
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if (depth <= 8) {
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blend_line_hv(p, draw->pixelstep[plane],
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color->comp[plane].u8[index], alpha,
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m, mask_linesize, l2depth, w_sub,
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draw->hsub[plane], draw->vsub[plane],
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xm0, left, right, bottom);
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} else {
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blend_line_hv16(p, draw->pixelstep[plane],
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color->comp[plane].u16[index], alpha,
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m, mask_linesize, l2depth, w_sub,
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draw->hsub[plane], draw->vsub[plane],
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xm0, left, right, bottom);
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}
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}
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}
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}
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}
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int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir,
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int value)
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{
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unsigned shift = sub_dir ? draw->vsub_max : draw->hsub_max;
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if (!shift)
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return value;
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if (round_dir >= 0)
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value += round_dir ? (1 << shift) - 1 : 1 << (shift - 1);
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return (value >> shift) << shift;
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}
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AVFilterFormats *ff_draw_supported_pixel_formats(unsigned flags)
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{
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enum AVPixelFormat i;
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FFDrawContext draw;
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AVFilterFormats *fmts = NULL;
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int ret;
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for (i = 0; av_pix_fmt_desc_get(i); i++)
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if (ff_draw_init(&draw, i, flags) >= 0 &&
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(ret = ff_add_format(&fmts, i)) < 0)
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return NULL;
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return fmts;
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}
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