yading@10: /*
yading@10:  * Copyright 2011 Stefano Sabatini <stefano.sabatini-lala poste it>
yading@10:  * Copyright 2012 Nicolas George <nicolas.george normalesup org>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <string.h>
yading@10: 
yading@10: #include "libavutil/avutil.h"
yading@10: #include "libavutil/colorspace.h"
yading@10: #include "libavutil/mem.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "drawutils.h"
yading@10: #include "formats.h"
yading@10: 
yading@10: enum { RED = 0, GREEN, BLUE, ALPHA };
yading@10: 
yading@10: int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
yading@10: {
yading@10:     switch (pix_fmt) {
yading@10:     case AV_PIX_FMT_0RGB:
yading@10:     case AV_PIX_FMT_ARGB:  rgba_map[ALPHA] = 0; rgba_map[RED  ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;
yading@10:     case AV_PIX_FMT_0BGR:
yading@10:     case AV_PIX_FMT_ABGR:  rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED  ] = 3; break;
yading@10:     case AV_PIX_FMT_RGB0:
yading@10:     case AV_PIX_FMT_RGBA:
yading@10:     case AV_PIX_FMT_RGB24: rgba_map[RED  ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;
yading@10:     case AV_PIX_FMT_BGRA:
yading@10:     case AV_PIX_FMT_BGR0:
yading@10:     case AV_PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 1; rgba_map[RED  ] = 2; rgba_map[ALPHA] = 3; break;
yading@10:     default:                    /* unsupported */
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4],
yading@10:                             enum AVPixelFormat pix_fmt, uint8_t rgba_color[4],
yading@10:                             int *is_packed_rgba, uint8_t rgba_map_ptr[4])
yading@10: {
yading@10:     uint8_t rgba_map[4] = {0};
yading@10:     int i;
yading@10:     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(pix_fmt);
yading@10:     int hsub = pix_desc->log2_chroma_w;
yading@10: 
yading@10:     *is_packed_rgba = ff_fill_rgba_map(rgba_map, pix_fmt) >= 0;
yading@10: 
yading@10:     if (*is_packed_rgba) {
yading@10:         pixel_step[0] = (av_get_bits_per_pixel(pix_desc))>>3;
yading@10:         for (i = 0; i < 4; i++)
yading@10:             dst_color[rgba_map[i]] = rgba_color[i];
yading@10: 
yading@10:         line[0] = av_malloc(w * pixel_step[0]);
yading@10:         for (i = 0; i < w; i++)
yading@10:             memcpy(line[0] + i * pixel_step[0], dst_color, pixel_step[0]);
yading@10:         if (rgba_map_ptr)
yading@10:             memcpy(rgba_map_ptr, rgba_map, sizeof(rgba_map[0]) * 4);
yading@10:     } else {
yading@10:         int plane;
yading@10: 
yading@10:         dst_color[0] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
yading@10:         dst_color[1] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
yading@10:         dst_color[2] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
yading@10:         dst_color[3] = rgba_color[3];
yading@10: 
yading@10:         for (plane = 0; plane < 4; plane++) {
yading@10:             int line_size;
yading@10:             int hsub1 = (plane == 1 || plane == 2) ? hsub : 0;
yading@10: 
yading@10:             pixel_step[plane] = 1;
yading@10:             line_size = (w >> hsub1) * pixel_step[plane];
yading@10:             line[plane] = av_malloc(line_size);
yading@10:             memset(line[plane], dst_color[plane], line_size);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4],
yading@10:                        uint8_t *src[4], int pixelstep[4],
yading@10:                        int hsub, int vsub, int x, int y, int w, int h)
yading@10: {
yading@10:     int i, plane;
yading@10:     uint8_t *p;
yading@10: 
yading@10:     for (plane = 0; plane < 4 && dst[plane]; plane++) {
yading@10:         int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
yading@10:         int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
yading@10: 
yading@10:         p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
yading@10:         for (i = 0; i < (h >> vsub1); i++) {
yading@10:             memcpy(p + (x >> hsub1) * pixelstep[plane],
yading@10:                    src[plane], (w >> hsub1) * pixelstep[plane]);
yading@10:             p += dst_linesize[plane];
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: void ff_copy_rectangle(uint8_t *dst[4], int dst_linesize[4],
yading@10:                        uint8_t *src[4], int src_linesize[4], int pixelstep[4],
yading@10:                        int hsub, int vsub, int x, int y, int y2, int w, int h)
yading@10: {
yading@10:     int i, plane;
yading@10:     uint8_t *p;
yading@10: 
yading@10:     for (plane = 0; plane < 4 && dst[plane]; plane++) {
yading@10:         int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
yading@10:         int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
yading@10: 
yading@10:         p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
yading@10:         for (i = 0; i < (h >> vsub1); i++) {
yading@10:             memcpy(p + (x >> hsub1) * pixelstep[plane],
yading@10:                    src[plane] + src_linesize[plane]*(i+(y2>>vsub1)), (w >> hsub1) * pixelstep[plane]);
yading@10:             p += dst_linesize[plane];
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
yading@10: {
yading@10:     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
yading@10:     const AVComponentDescriptor *c;
yading@10:     unsigned i, nb_planes = 0;
yading@10:     int pixelstep[MAX_PLANES] = { 0 };
yading@10: 
yading@10:     if (!desc->name)
yading@10:         return AVERROR(EINVAL);
yading@10:     if (desc->flags & ~(PIX_FMT_PLANAR | PIX_FMT_RGB | PIX_FMT_PSEUDOPAL | PIX_FMT_ALPHA))
yading@10:         return AVERROR(ENOSYS);
yading@10:     for (i = 0; i < desc->nb_components; i++) {
yading@10:         c = &desc->comp[i];
yading@10:         /* for now, only 8-bits formats */
yading@10:         if (c->depth_minus1 != 8 - 1)
yading@10:             return AVERROR(ENOSYS);
yading@10:         if (c->plane >= MAX_PLANES)
yading@10:             return AVERROR(ENOSYS);
yading@10:         /* strange interleaving */
yading@10:         if (pixelstep[c->plane] != 0 &&
yading@10:             pixelstep[c->plane] != c->step_minus1 + 1)
yading@10:             return AVERROR(ENOSYS);
yading@10:         pixelstep[c->plane] = c->step_minus1 + 1;
yading@10:         if (pixelstep[c->plane] >= 8)
yading@10:             return AVERROR(ENOSYS);
yading@10:         nb_planes = FFMAX(nb_planes, c->plane + 1);
yading@10:     }
yading@10:     if ((desc->log2_chroma_w || desc->log2_chroma_h) && nb_planes < 3)
yading@10:         return AVERROR(ENOSYS); /* exclude NV12 and NV21 */
yading@10:     memset(draw, 0, sizeof(*draw));
yading@10:     draw->desc      = desc;
yading@10:     draw->format    = format;
yading@10:     draw->nb_planes = nb_planes;
yading@10:     memcpy(draw->pixelstep, pixelstep, sizeof(draw->pixelstep));
yading@10:     if (nb_planes >= 3 && !(desc->flags & PIX_FMT_RGB)) {
yading@10:         draw->hsub[1] = draw->hsub[2] = draw->hsub_max = desc->log2_chroma_w;
yading@10:         draw->vsub[1] = draw->vsub[2] = draw->vsub_max = desc->log2_chroma_h;
yading@10:     }
yading@10:     for (i = 0; i < ((desc->nb_components - 1) | 1); i++)
yading@10:         draw->comp_mask[desc->comp[i].plane] |=
yading@10:             1 << (desc->comp[i].offset_plus1 - 1);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
yading@10: {
yading@10:     unsigned i;
yading@10:     uint8_t rgba_map[4];
yading@10: 
yading@10:     if (rgba != color->rgba)
yading@10:         memcpy(color->rgba, rgba, sizeof(color->rgba));
yading@10:     if ((draw->desc->flags & PIX_FMT_RGB) && draw->nb_planes == 1 &&
yading@10:         ff_fill_rgba_map(rgba_map, draw->format) >= 0) {
yading@10:         for (i = 0; i < 4; i++)
yading@10:             color->comp[0].u8[rgba_map[i]] = rgba[i];
yading@10:     } else if (draw->nb_planes == 3 || draw->nb_planes == 4) {
yading@10:         /* assume YUV */
yading@10:         color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
yading@10:         color->comp[1].u8[0] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
yading@10:         color->comp[2].u8[0] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
yading@10:         color->comp[3].u8[0] = rgba[3];
yading@10:     } else if (draw->format == AV_PIX_FMT_GRAY8 || draw->format == AV_PIX_FMT_GRAY8A) {
yading@10:         color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
yading@10:         color->comp[1].u8[0] = rgba[3];
yading@10:     } else {
yading@10:         av_log(NULL, AV_LOG_WARNING,
yading@10:                "Color conversion not implemented for %s\n", draw->desc->name);
yading@10:         memset(color, 128, sizeof(*color));
yading@10:     }
yading@10: }
yading@10: 
yading@10: static uint8_t *pointer_at(FFDrawContext *draw, uint8_t *data[], int linesize[],
yading@10:                            int plane, int x, int y)
yading@10: {
yading@10:     return data[plane] +
yading@10:            (y >> draw->vsub[plane]) * linesize[plane] +
yading@10:            (x >> draw->hsub[plane]) * draw->pixelstep[plane];
yading@10: }
yading@10: 
yading@10: void ff_copy_rectangle2(FFDrawContext *draw,
yading@10:                         uint8_t *dst[], int dst_linesize[],
yading@10:                         uint8_t *src[], int src_linesize[],
yading@10:                         int dst_x, int dst_y, int src_x, int src_y,
yading@10:                         int w, int h)
yading@10: {
yading@10:     int plane, y, wp, hp;
yading@10:     uint8_t *p, *q;
yading@10: 
yading@10:     for (plane = 0; plane < draw->nb_planes; plane++) {
yading@10:         p = pointer_at(draw, src, src_linesize, plane, src_x, src_y);
yading@10:         q = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
yading@10:         wp = (w >> draw->hsub[plane]) * draw->pixelstep[plane];
yading@10:         hp = (h >> draw->vsub[plane]);
yading@10:         for (y = 0; y < hp; y++) {
yading@10:             memcpy(q, p, wp);
yading@10:             p += src_linesize[plane];
yading@10:             q += dst_linesize[plane];
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color,
yading@10:                        uint8_t *dst[], int dst_linesize[],
yading@10:                        int dst_x, int dst_y, int w, int h)
yading@10: {
yading@10:     int plane, x, y, wp, hp;
yading@10:     uint8_t *p0, *p;
yading@10: 
yading@10:     for (plane = 0; plane < draw->nb_planes; plane++) {
yading@10:         p0 = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
yading@10:         wp = (w >> draw->hsub[plane]);
yading@10:         hp = (h >> draw->vsub[plane]);
yading@10:         if (!hp)
yading@10:             return;
yading@10:         p = p0;
yading@10:         /* copy first line from color */
yading@10:         for (x = 0; x < wp; x++) {
yading@10:             memcpy(p, color->comp[plane].u8, draw->pixelstep[plane]);
yading@10:             p += draw->pixelstep[plane];
yading@10:         }
yading@10:         wp *= draw->pixelstep[plane];
yading@10:         /* copy next lines from first line */
yading@10:         p = p0 + dst_linesize[plane];
yading@10:         for (y = 1; y < hp; y++) {
yading@10:             memcpy(p, p0, wp);
yading@10:             p += dst_linesize[plane];
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Clip interval [x; x+w[ within [0; wmax[.
yading@10:  * The resulting w may be negative if the final interval is empty.
yading@10:  * dx, if not null, return the difference between in and out value of x.
yading@10:  */
yading@10: static void clip_interval(int wmax, int *x, int *w, int *dx)
yading@10: {
yading@10:     if (dx)
yading@10:         *dx = 0;
yading@10:     if (*x < 0) {
yading@10:         if (dx)
yading@10:             *dx = -*x;
yading@10:         *w += *x;
yading@10:         *x = 0;
yading@10:     }
yading@10:     if (*x + *w > wmax)
yading@10:         *w = wmax - *x;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Decompose w pixels starting at x
yading@10:  * into start + (w starting at x) + end
yading@10:  * with x and w aligned on multiples of 1<<sub.
yading@10:  */
yading@10: static void subsampling_bounds(int sub, int *x, int *w, int *start, int *end)
yading@10: {
yading@10:     int mask = (1 << sub) - 1;
yading@10: 
yading@10:     *start = (-*x) & mask;
yading@10:     *x += *start;
yading@10:     *start = FFMIN(*start, *w);
yading@10:     *w -= *start;
yading@10:     *end = *w & mask;
yading@10:     *w >>= sub;
yading@10: }
yading@10: 
yading@10: static int component_used(FFDrawContext *draw, int plane, int comp)
yading@10: {
yading@10:     return (draw->comp_mask[plane] >> comp) & 1;
yading@10: }
yading@10: 
yading@10: /* If alpha is in the [ 0 ; 0x1010101 ] range,
yading@10:    then alpha * value is in the [ 0 ; 0xFFFFFFFF ] range,
yading@10:    and >> 24 gives a correct rounding. */
yading@10: static void blend_line(uint8_t *dst, unsigned src, unsigned alpha,
yading@10:                        int dx, int w, unsigned hsub, int left, int right)
yading@10: {
yading@10:     unsigned asrc = alpha * src;
yading@10:     unsigned tau = 0x1010101 - alpha;
yading@10:     int x;
yading@10: 
yading@10:     if (left) {
yading@10:         unsigned suba = (left * alpha) >> hsub;
yading@10:         *dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
yading@10:         dst += dx;
yading@10:     }
yading@10:     for (x = 0; x < w; x++) {
yading@10:         *dst = (*dst * tau + asrc) >> 24;
yading@10:         dst += dx;
yading@10:     }
yading@10:     if (right) {
yading@10:         unsigned suba = (right * alpha) >> hsub;
yading@10:         *dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
yading@10:     }
yading@10: }
yading@10: 
yading@10: void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color,
yading@10:                         uint8_t *dst[], int dst_linesize[],
yading@10:                         int dst_w, int dst_h,
yading@10:                         int x0, int y0, int w, int h)
yading@10: {
yading@10:     unsigned alpha, nb_planes, nb_comp, plane, comp;
yading@10:     int w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;
yading@10:     uint8_t *p0, *p;
yading@10: 
yading@10:     /* TODO optimize if alpha = 0xFF */
yading@10:     clip_interval(dst_w, &x0, &w, NULL);
yading@10:     clip_interval(dst_h, &y0, &h, NULL);
yading@10:     if (w <= 0 || h <= 0 || !color->rgba[3])
yading@10:         return;
yading@10:     /* 0x10203 * alpha + 2 is in the [ 2 ; 0x1010101 - 2 ] range */
yading@10:     alpha = 0x10203 * color->rgba[3] + 0x2;
yading@10:     nb_planes = (draw->nb_planes - 1) | 1; /* eliminate alpha */
yading@10:     for (plane = 0; plane < nb_planes; plane++) {
yading@10:         nb_comp = draw->pixelstep[plane];
yading@10:         p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
yading@10:         w_sub = w;
yading@10:         h_sub = h;
yading@10:         x_sub = x0;
yading@10:         y_sub = y0;
yading@10:         subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
yading@10:         subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
yading@10:         for (comp = 0; comp < nb_comp; comp++) {
yading@10:             if (!component_used(draw, plane, comp))
yading@10:                 continue;
yading@10:             p = p0 + comp;
yading@10:             if (top) {
yading@10:                 blend_line(p, color->comp[plane].u8[comp], alpha >> 1,
yading@10:                            draw->pixelstep[plane], w_sub,
yading@10:                            draw->hsub[plane], left, right);
yading@10:                 p += dst_linesize[plane];
yading@10:             }
yading@10:             for (y = 0; y < h_sub; y++) {
yading@10:                 blend_line(p, color->comp[plane].u8[comp], alpha,
yading@10:                            draw->pixelstep[plane], w_sub,
yading@10:                            draw->hsub[plane], left, right);
yading@10:                 p += dst_linesize[plane];
yading@10:             }
yading@10:             if (bottom)
yading@10:                 blend_line(p, color->comp[plane].u8[comp], alpha >> 1,
yading@10:                            draw->pixelstep[plane], w_sub,
yading@10:                            draw->hsub[plane], left, right);
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void blend_pixel(uint8_t *dst, unsigned src, unsigned alpha,
yading@10:                         uint8_t *mask, int mask_linesize, int l2depth,
yading@10:                         unsigned w, unsigned h, unsigned shift, unsigned xm0)
yading@10: {
yading@10:     unsigned xm, x, y, t = 0;
yading@10:     unsigned xmshf = 3 - l2depth;
yading@10:     unsigned xmmod = 7 >> l2depth;
yading@10:     unsigned mbits = (1 << (1 << l2depth)) - 1;
yading@10:     unsigned mmult = 255 / mbits;
yading@10: 
yading@10:     for (y = 0; y < h; y++) {
yading@10:         xm = xm0;
yading@10:         for (x = 0; x < w; x++) {
yading@10:             t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)
yading@10:                  * mmult;
yading@10:             xm++;
yading@10:         }
yading@10:         mask += mask_linesize;
yading@10:     }
yading@10:     alpha = (t >> shift) * alpha;
yading@10:     *dst = ((0x1010101 - alpha) * *dst + alpha * src) >> 24;
yading@10: }
yading@10: 
yading@10: static void blend_line_hv(uint8_t *dst, int dst_delta,
yading@10:                           unsigned src, unsigned alpha,
yading@10:                           uint8_t *mask, int mask_linesize, int l2depth, int w,
yading@10:                           unsigned hsub, unsigned vsub,
yading@10:                           int xm, int left, int right, int hband)
yading@10: {
yading@10:     int x;
yading@10: 
yading@10:     if (left) {
yading@10:         blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
yading@10:                     left, hband, hsub + vsub, xm);
yading@10:         dst += dst_delta;
yading@10:         xm += left;
yading@10:     }
yading@10:     for (x = 0; x < w; x++) {
yading@10:         blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
yading@10:                     1 << hsub, hband, hsub + vsub, xm);
yading@10:         dst += dst_delta;
yading@10:         xm += 1 << hsub;
yading@10:     }
yading@10:     if (right)
yading@10:         blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
yading@10:                     right, hband, hsub + vsub, xm);
yading@10: }
yading@10: 
yading@10: void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color,
yading@10:                    uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h,
yading@10:                    uint8_t *mask,  int mask_linesize, int mask_w, int mask_h,
yading@10:                    int l2depth, unsigned endianness, int x0, int y0)
yading@10: {
yading@10:     unsigned alpha, nb_planes, nb_comp, plane, comp;
yading@10:     int xm0, ym0, w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;
yading@10:     uint8_t *p0, *p, *m;
yading@10: 
yading@10:     clip_interval(dst_w, &x0, &mask_w, &xm0);
yading@10:     clip_interval(dst_h, &y0, &mask_h, &ym0);
yading@10:     mask += ym0 * mask_linesize;
yading@10:     if (mask_w <= 0 || mask_h <= 0 || !color->rgba[3])
yading@10:         return;
yading@10:     /* alpha is in the [ 0 ; 0x10203 ] range,
yading@10:        alpha * mask is in the [ 0 ; 0x1010101 - 4 ] range */
yading@10:     alpha = (0x10307 * color->rgba[3] + 0x3) >> 8;
yading@10:     nb_planes = (draw->nb_planes - 1) | 1; /* eliminate alpha */
yading@10:     for (plane = 0; plane < nb_planes; plane++) {
yading@10:         nb_comp = draw->pixelstep[plane];
yading@10:         p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
yading@10:         w_sub = mask_w;
yading@10:         h_sub = mask_h;
yading@10:         x_sub = x0;
yading@10:         y_sub = y0;
yading@10:         subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
yading@10:         subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
yading@10:         for (comp = 0; comp < nb_comp; comp++) {
yading@10:             if (!component_used(draw, plane, comp))
yading@10:                 continue;
yading@10:             p = p0 + comp;
yading@10:             m = mask;
yading@10:             if (top) {
yading@10:                 blend_line_hv(p, draw->pixelstep[plane],
yading@10:                               color->comp[plane].u8[comp], alpha,
yading@10:                               m, mask_linesize, l2depth, w_sub,
yading@10:                               draw->hsub[plane], draw->vsub[plane],
yading@10:                               xm0, left, right, top);
yading@10:                 p += dst_linesize[plane];
yading@10:                 m += top * mask_linesize;
yading@10:             }
yading@10:             for (y = 0; y < h_sub; y++) {
yading@10:                 blend_line_hv(p, draw->pixelstep[plane],
yading@10:                               color->comp[plane].u8[comp], alpha,
yading@10:                               m, mask_linesize, l2depth, w_sub,
yading@10:                               draw->hsub[plane], draw->vsub[plane],
yading@10:                               xm0, left, right, 1 << draw->vsub[plane]);
yading@10:                 p += dst_linesize[plane];
yading@10:                 m += mask_linesize << draw->vsub[plane];
yading@10:             }
yading@10:             if (bottom)
yading@10:                 blend_line_hv(p, draw->pixelstep[plane],
yading@10:                               color->comp[plane].u8[comp], alpha,
yading@10:                               m, mask_linesize, l2depth, w_sub,
yading@10:                               draw->hsub[plane], draw->vsub[plane],
yading@10:                               xm0, left, right, bottom);
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir,
yading@10:                          int value)
yading@10: {
yading@10:     unsigned shift = sub_dir ? draw->vsub_max : draw->hsub_max;
yading@10: 
yading@10:     if (!shift)
yading@10:         return value;
yading@10:     if (round_dir >= 0)
yading@10:         value += round_dir ? (1 << shift) - 1 : 1 << (shift - 1);
yading@10:     return (value >> shift) << shift;
yading@10: }
yading@10: 
yading@10: AVFilterFormats *ff_draw_supported_pixel_formats(unsigned flags)
yading@10: {
yading@10:     enum AVPixelFormat i, pix_fmts[AV_PIX_FMT_NB + 1];
yading@10:     unsigned n = 0;
yading@10:     FFDrawContext draw;
yading@10: 
yading@10:     for (i = 0; i < AV_PIX_FMT_NB; i++)
yading@10:         if (ff_draw_init(&draw, i, flags) >= 0)
yading@10:             pix_fmts[n++] = i;
yading@10:     pix_fmts[n++] = AV_PIX_FMT_NONE;
yading@10:     return ff_make_format_list(pix_fmts);
yading@10: }
yading@10: 
yading@10: #ifdef TEST
yading@10: 
yading@10: #undef printf
yading@10: 
yading@10: int main(void)
yading@10: {
yading@10:     enum AVPixelFormat f;
yading@10:     const AVPixFmtDescriptor *desc;
yading@10:     FFDrawContext draw;
yading@10:     FFDrawColor color;
yading@10:     int r, i;
yading@10: 
yading@10:     for (f = 0; f < AV_PIX_FMT_NB; f++) {
yading@10:         desc = av_pix_fmt_desc_get(f);
yading@10:         if (!desc->name)
yading@10:             continue;
yading@10:         printf("Testing %s...%*s", desc->name,
yading@10:                (int)(16 - strlen(desc->name)), "");
yading@10:         r = ff_draw_init(&draw, f, 0);
yading@10:         if (r < 0) {
yading@10:             char buf[128];
yading@10:             av_strerror(r, buf, sizeof(buf));
yading@10:             printf("no: %s\n", buf);
yading@10:             continue;
yading@10:         }
yading@10:         ff_draw_color(&draw, &color, (uint8_t[]) { 1, 0, 0, 1 });
yading@10:         for (i = 0; i < sizeof(color); i++)
yading@10:             if (((uint8_t *)&color)[i] != 128)
yading@10:                 break;
yading@10:         if (i == sizeof(color)) {
yading@10:             printf("fallback color\n");
yading@10:             continue;
yading@10:         }
yading@10:         printf("ok\n");
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #endif