Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * Copyright 2011 Stefano Sabatini <stefano.sabatini-lala poste it>
  3.  * Copyright 2012 Nicolas George <nicolas.george normalesup org>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include <string.h>
  23.  
  24. #include "libavutil/avutil.h"
  25. #include "libavutil/colorspace.h"
  26. #include "libavutil/mem.h"
  27. #include "libavutil/pixdesc.h"
  28. #include "drawutils.h"
  29. #include "formats.h"
  30.  
  31. enum { RED = 0, GREEN, BLUE, ALPHA };
  32.  
  33. int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
  34. {
  35.     switch (pix_fmt) {
  36.     case AV_PIX_FMT_0RGB:
  37.     case AV_PIX_FMT_ARGB:  rgba_map[ALPHA] = 0; rgba_map[RED  ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;
  38.     case AV_PIX_FMT_0BGR:
  39.     case AV_PIX_FMT_ABGR:  rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED  ] = 3; break;
  40.     case AV_PIX_FMT_RGB48LE:
  41.     case AV_PIX_FMT_RGB48BE:
  42.     case AV_PIX_FMT_RGBA64BE:
  43.     case AV_PIX_FMT_RGBA64LE:
  44.     case AV_PIX_FMT_RGB0:
  45.     case AV_PIX_FMT_RGBA:
  46.     case AV_PIX_FMT_RGB24: rgba_map[RED  ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;
  47.     case AV_PIX_FMT_BGR48LE:
  48.     case AV_PIX_FMT_BGR48BE:
  49.     case AV_PIX_FMT_BGRA64BE:
  50.     case AV_PIX_FMT_BGRA64LE:
  51.     case AV_PIX_FMT_BGRA:
  52.     case AV_PIX_FMT_BGR0:
  53.     case AV_PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 1; rgba_map[RED  ] = 2; rgba_map[ALPHA] = 3; break;
  54.     case AV_PIX_FMT_GBRAP:
  55.     case AV_PIX_FMT_GBRP:  rgba_map[GREEN] = 0; rgba_map[BLUE ] = 1; rgba_map[RED  ] = 2; rgba_map[ALPHA] = 3; break;
  56.     default:                    /* unsupported */
  57.         return AVERROR(EINVAL);
  58.     }
  59.     return 0;
  60. }
  61.  
  62. int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4],
  63.                             enum AVPixelFormat pix_fmt, uint8_t rgba_color[4],
  64.                             int *is_packed_rgba, uint8_t rgba_map_ptr[4])
  65. {
  66.     uint8_t rgba_map[4] = {0};
  67.     int i;
  68.     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(pix_fmt);
  69.     int hsub = pix_desc->log2_chroma_w;
  70.  
  71.     *is_packed_rgba = ff_fill_rgba_map(rgba_map, pix_fmt) >= 0;
  72.  
  73.     if (*is_packed_rgba) {
  74.         pixel_step[0] = (av_get_bits_per_pixel(pix_desc))>>3;
  75.         for (i = 0; i < 4; i++)
  76.             dst_color[rgba_map[i]] = rgba_color[i];
  77.  
  78.         line[0] = av_malloc(w * pixel_step[0]);
  79.         for (i = 0; i < w; i++)
  80.             memcpy(line[0] + i * pixel_step[0], dst_color, pixel_step[0]);
  81.         if (rgba_map_ptr)
  82.             memcpy(rgba_map_ptr, rgba_map, sizeof(rgba_map[0]) * 4);
  83.     } else {
  84.         int plane;
  85.  
  86.         dst_color[0] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
  87.         dst_color[1] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
  88.         dst_color[2] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
  89.         dst_color[3] = rgba_color[3];
  90.  
  91.         for (plane = 0; plane < 4; plane++) {
  92.             int line_size;
  93.             int hsub1 = (plane == 1 || plane == 2) ? hsub : 0;
  94.  
  95.             pixel_step[plane] = 1;
  96.             line_size = FF_CEIL_RSHIFT(w, hsub1) * pixel_step[plane];
  97.             line[plane] = av_malloc(line_size);
  98.             memset(line[plane], dst_color[plane], line_size);
  99.         }
  100.     }
  101.  
  102.     return 0;
  103. }
  104.  
  105. void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4],
  106.                        uint8_t *src[4], int pixelstep[4],
  107.                        int hsub, int vsub, int x, int y, int w, int h)
  108. {
  109.     int i, plane;
  110.     uint8_t *p;
  111.  
  112.     for (plane = 0; plane < 4 && dst[plane]; plane++) {
  113.         int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
  114.         int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
  115.         int width  = FF_CEIL_RSHIFT(w, hsub1);
  116.         int height = FF_CEIL_RSHIFT(h, vsub1);
  117.  
  118.         p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
  119.         for (i = 0; i < height; i++) {
  120.             memcpy(p + (x >> hsub1) * pixelstep[plane],
  121.                    src[plane], width * pixelstep[plane]);
  122.             p += dst_linesize[plane];
  123.         }
  124.     }
  125. }
  126.  
  127. void ff_copy_rectangle(uint8_t *dst[4], int dst_linesize[4],
  128.                        uint8_t *src[4], int src_linesize[4], int pixelstep[4],
  129.                        int hsub, int vsub, int x, int y, int y2, int w, int h)
  130. {
  131.     int i, plane;
  132.     uint8_t *p;
  133.  
  134.     for (plane = 0; plane < 4 && dst[plane]; plane++) {
  135.         int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
  136.         int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
  137.         int width  = FF_CEIL_RSHIFT(w, hsub1);
  138.         int height = FF_CEIL_RSHIFT(h, vsub1);
  139.  
  140.         p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
  141.         for (i = 0; i < height; i++) {
  142.             memcpy(p + (x >> hsub1) * pixelstep[plane],
  143.                    src[plane] + src_linesize[plane]*(i+(y2>>vsub1)), width * pixelstep[plane]);
  144.             p += dst_linesize[plane];
  145.         }
  146.     }
  147. }
  148.  
  149. int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
  150. {
  151.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
  152.     const AVComponentDescriptor *c;
  153.     unsigned i, nb_planes = 0;
  154.     int pixelstep[MAX_PLANES] = { 0 };
  155.  
  156.     if (!desc->name)
  157.         return AVERROR(EINVAL);
  158.     if (desc->flags & ~(AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_RGB | AV_PIX_FMT_FLAG_PSEUDOPAL | AV_PIX_FMT_FLAG_ALPHA))
  159.         return AVERROR(ENOSYS);
  160.     for (i = 0; i < desc->nb_components; i++) {
  161.         c = &desc->comp[i];
  162.         /* for now, only 8-bits formats */
  163.         if (c->depth_minus1 != 8 - 1)
  164.             return AVERROR(ENOSYS);
  165.         if (c->plane >= MAX_PLANES)
  166.             return AVERROR(ENOSYS);
  167.         /* strange interleaving */
  168.         if (pixelstep[c->plane] != 0 &&
  169.             pixelstep[c->plane] != c->step_minus1 + 1)
  170.             return AVERROR(ENOSYS);
  171.         pixelstep[c->plane] = c->step_minus1 + 1;
  172.         if (pixelstep[c->plane] >= 8)
  173.             return AVERROR(ENOSYS);
  174.         nb_planes = FFMAX(nb_planes, c->plane + 1);
  175.     }
  176.     if ((desc->log2_chroma_w || desc->log2_chroma_h) && nb_planes < 3)
  177.         return AVERROR(ENOSYS); /* exclude NV12 and NV21 */
  178.     memset(draw, 0, sizeof(*draw));
  179.     draw->desc      = desc;
  180.     draw->format    = format;
  181.     draw->nb_planes = nb_planes;
  182.     memcpy(draw->pixelstep, pixelstep, sizeof(draw->pixelstep));
  183.     draw->hsub[1] = draw->hsub[2] = draw->hsub_max = desc->log2_chroma_w;
  184.     draw->vsub[1] = draw->vsub[2] = draw->vsub_max = desc->log2_chroma_h;
  185.     for (i = 0; i < ((desc->nb_components - 1) | 1); i++)
  186.         draw->comp_mask[desc->comp[i].plane] |=
  187.             1 << (desc->comp[i].offset_plus1 - 1);
  188.     return 0;
  189. }
  190.  
  191. void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
  192. {
  193.     unsigned i;
  194.     uint8_t rgba_map[4];
  195.  
  196.     if (rgba != color->rgba)
  197.         memcpy(color->rgba, rgba, sizeof(color->rgba));
  198.     if ((draw->desc->flags & AV_PIX_FMT_FLAG_RGB) &&
  199.         ff_fill_rgba_map(rgba_map, draw->format) >= 0) {
  200.         if (draw->nb_planes == 1) {
  201.         for (i = 0; i < 4; i++)
  202.             color->comp[0].u8[rgba_map[i]] = rgba[i];
  203.         } else {
  204.             for (i = 0; i < 4; i++)
  205.                 color->comp[rgba_map[i]].u8[0] = rgba[i];
  206.         }
  207.     } else if (draw->nb_planes == 3 || draw->nb_planes == 4) {
  208.         /* assume YUV */
  209.         color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
  210.         color->comp[1].u8[0] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
  211.         color->comp[2].u8[0] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
  212.         color->comp[3].u8[0] = rgba[3];
  213.     } else if (draw->format == AV_PIX_FMT_GRAY8 || draw->format == AV_PIX_FMT_GRAY8A) {
  214.         color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
  215.         color->comp[1].u8[0] = rgba[3];
  216.     } else {
  217.         av_log(NULL, AV_LOG_WARNING,
  218.                "Color conversion not implemented for %s\n", draw->desc->name);
  219.         memset(color, 128, sizeof(*color));
  220.     }
  221. }
  222.  
  223. static uint8_t *pointer_at(FFDrawContext *draw, uint8_t *data[], int linesize[],
  224.                            int plane, int x, int y)
  225. {
  226.     return data[plane] +
  227.            (y >> draw->vsub[plane]) * linesize[plane] +
  228.            (x >> draw->hsub[plane]) * draw->pixelstep[plane];
  229. }
  230.  
  231. void ff_copy_rectangle2(FFDrawContext *draw,
  232.                         uint8_t *dst[], int dst_linesize[],
  233.                         uint8_t *src[], int src_linesize[],
  234.                         int dst_x, int dst_y, int src_x, int src_y,
  235.                         int w, int h)
  236. {
  237.     int plane, y, wp, hp;
  238.     uint8_t *p, *q;
  239.  
  240.     for (plane = 0; plane < draw->nb_planes; plane++) {
  241.         p = pointer_at(draw, src, src_linesize, plane, src_x, src_y);
  242.         q = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
  243.         wp = FF_CEIL_RSHIFT(w, draw->hsub[plane]) * draw->pixelstep[plane];
  244.         hp = FF_CEIL_RSHIFT(h, draw->vsub[plane]);
  245.         for (y = 0; y < hp; y++) {
  246.             memcpy(q, p, wp);
  247.             p += src_linesize[plane];
  248.             q += dst_linesize[plane];
  249.         }
  250.     }
  251. }
  252.  
  253. void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color,
  254.                        uint8_t *dst[], int dst_linesize[],
  255.                        int dst_x, int dst_y, int w, int h)
  256. {
  257.     int plane, x, y, wp, hp;
  258.     uint8_t *p0, *p;
  259.  
  260.     for (plane = 0; plane < draw->nb_planes; plane++) {
  261.         p0 = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
  262.         wp = FF_CEIL_RSHIFT(w, draw->hsub[plane]);
  263.         hp = FF_CEIL_RSHIFT(h, draw->vsub[plane]);
  264.         if (!hp)
  265.             return;
  266.         p = p0;
  267.         /* copy first line from color */
  268.         for (x = 0; x < wp; x++) {
  269.             memcpy(p, color->comp[plane].u8, draw->pixelstep[plane]);
  270.             p += draw->pixelstep[plane];
  271.         }
  272.         wp *= draw->pixelstep[plane];
  273.         /* copy next lines from first line */
  274.         p = p0 + dst_linesize[plane];
  275.         for (y = 1; y < hp; y++) {
  276.             memcpy(p, p0, wp);
  277.             p += dst_linesize[plane];
  278.         }
  279.     }
  280. }
  281.  
  282. /**
  283.  * Clip interval [x; x+w[ within [0; wmax[.
  284.  * The resulting w may be negative if the final interval is empty.
  285.  * dx, if not null, return the difference between in and out value of x.
  286.  */
  287. static void clip_interval(int wmax, int *x, int *w, int *dx)
  288. {
  289.     if (dx)
  290.         *dx = 0;
  291.     if (*x < 0) {
  292.         if (dx)
  293.             *dx = -*x;
  294.         *w += *x;
  295.         *x = 0;
  296.     }
  297.     if (*x + *w > wmax)
  298.         *w = wmax - *x;
  299. }
  300.  
  301. /**
  302.  * Decompose w pixels starting at x
  303.  * into start + (w starting at x) + end
  304.  * with x and w aligned on multiples of 1<<sub.
  305.  */
  306. static void subsampling_bounds(int sub, int *x, int *w, int *start, int *end)
  307. {
  308.     int mask = (1 << sub) - 1;
  309.  
  310.     *start = (-*x) & mask;
  311.     *x += *start;
  312.     *start = FFMIN(*start, *w);
  313.     *w -= *start;
  314.     *end = *w & mask;
  315.     *w >>= sub;
  316. }
  317.  
  318. static int component_used(FFDrawContext *draw, int plane, int comp)
  319. {
  320.     return (draw->comp_mask[plane] >> comp) & 1;
  321. }
  322.  
  323. /* If alpha is in the [ 0 ; 0x1010101 ] range,
  324.    then alpha * value is in the [ 0 ; 0xFFFFFFFF ] range,
  325.    and >> 24 gives a correct rounding. */
  326. static void blend_line(uint8_t *dst, unsigned src, unsigned alpha,
  327.                        int dx, int w, unsigned hsub, int left, int right)
  328. {
  329.     unsigned asrc = alpha * src;
  330.     unsigned tau = 0x1010101 - alpha;
  331.     int x;
  332.  
  333.     if (left) {
  334.         unsigned suba = (left * alpha) >> hsub;
  335.         *dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
  336.         dst += dx;
  337.     }
  338.     for (x = 0; x < w; x++) {
  339.         *dst = (*dst * tau + asrc) >> 24;
  340.         dst += dx;
  341.     }
  342.     if (right) {
  343.         unsigned suba = (right * alpha) >> hsub;
  344.         *dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
  345.     }
  346. }
  347.  
  348. void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color,
  349.                         uint8_t *dst[], int dst_linesize[],
  350.                         int dst_w, int dst_h,
  351.                         int x0, int y0, int w, int h)
  352. {
  353.     unsigned alpha, nb_planes, nb_comp, plane, comp;
  354.     int w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;
  355.     uint8_t *p0, *p;
  356.  
  357.     /* TODO optimize if alpha = 0xFF */
  358.     clip_interval(dst_w, &x0, &w, NULL);
  359.     clip_interval(dst_h, &y0, &h, NULL);
  360.     if (w <= 0 || h <= 0 || !color->rgba[3])
  361.         return;
  362.     /* 0x10203 * alpha + 2 is in the [ 2 ; 0x1010101 - 2 ] range */
  363.     alpha = 0x10203 * color->rgba[3] + 0x2;
  364.     nb_planes = (draw->nb_planes - 1) | 1; /* eliminate alpha */
  365.     for (plane = 0; plane < nb_planes; plane++) {
  366.         nb_comp = draw->pixelstep[plane];
  367.         p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
  368.         w_sub = w;
  369.         h_sub = h;
  370.         x_sub = x0;
  371.         y_sub = y0;
  372.         subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
  373.         subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
  374.         for (comp = 0; comp < nb_comp; comp++) {
  375.             if (!component_used(draw, plane, comp))
  376.                 continue;
  377.             p = p0 + comp;
  378.             if (top) {
  379.                 blend_line(p, color->comp[plane].u8[comp], alpha >> 1,
  380.                            draw->pixelstep[plane], w_sub,
  381.                            draw->hsub[plane], left, right);
  382.                 p += dst_linesize[plane];
  383.             }
  384.             for (y = 0; y < h_sub; y++) {
  385.                 blend_line(p, color->comp[plane].u8[comp], alpha,
  386.                            draw->pixelstep[plane], w_sub,
  387.                            draw->hsub[plane], left, right);
  388.                 p += dst_linesize[plane];
  389.             }
  390.             if (bottom)
  391.                 blend_line(p, color->comp[plane].u8[comp], alpha >> 1,
  392.                            draw->pixelstep[plane], w_sub,
  393.                            draw->hsub[plane], left, right);
  394.         }
  395.     }
  396. }
  397.  
  398. static void blend_pixel(uint8_t *dst, unsigned src, unsigned alpha,
  399.                         uint8_t *mask, int mask_linesize, int l2depth,
  400.                         unsigned w, unsigned h, unsigned shift, unsigned xm0)
  401. {
  402.     unsigned xm, x, y, t = 0;
  403.     unsigned xmshf = 3 - l2depth;
  404.     unsigned xmmod = 7 >> l2depth;
  405.     unsigned mbits = (1 << (1 << l2depth)) - 1;
  406.     unsigned mmult = 255 / mbits;
  407.  
  408.     for (y = 0; y < h; y++) {
  409.         xm = xm0;
  410.         for (x = 0; x < w; x++) {
  411.             t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)
  412.                  * mmult;
  413.             xm++;
  414.         }
  415.         mask += mask_linesize;
  416.     }
  417.     alpha = (t >> shift) * alpha;
  418.     *dst = ((0x1010101 - alpha) * *dst + alpha * src) >> 24;
  419. }
  420.  
  421. static void blend_line_hv(uint8_t *dst, int dst_delta,
  422.                           unsigned src, unsigned alpha,
  423.                           uint8_t *mask, int mask_linesize, int l2depth, int w,
  424.                           unsigned hsub, unsigned vsub,
  425.                           int xm, int left, int right, int hband)
  426. {
  427.     int x;
  428.  
  429.     if (left) {
  430.         blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
  431.                     left, hband, hsub + vsub, xm);
  432.         dst += dst_delta;
  433.         xm += left;
  434.     }
  435.     for (x = 0; x < w; x++) {
  436.         blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
  437.                     1 << hsub, hband, hsub + vsub, xm);
  438.         dst += dst_delta;
  439.         xm += 1 << hsub;
  440.     }
  441.     if (right)
  442.         blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
  443.                     right, hband, hsub + vsub, xm);
  444. }
  445.  
  446. void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color,
  447.                    uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h,
  448.                    uint8_t *mask,  int mask_linesize, int mask_w, int mask_h,
  449.                    int l2depth, unsigned endianness, int x0, int y0)
  450. {
  451.     unsigned alpha, nb_planes, nb_comp, plane, comp;
  452.     int xm0, ym0, w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;
  453.     uint8_t *p0, *p, *m;
  454.  
  455.     clip_interval(dst_w, &x0, &mask_w, &xm0);
  456.     clip_interval(dst_h, &y0, &mask_h, &ym0);
  457.     mask += ym0 * mask_linesize;
  458.     if (mask_w <= 0 || mask_h <= 0 || !color->rgba[3])
  459.         return;
  460.     /* alpha is in the [ 0 ; 0x10203 ] range,
  461.        alpha * mask is in the [ 0 ; 0x1010101 - 4 ] range */
  462.     alpha = (0x10307 * color->rgba[3] + 0x3) >> 8;
  463.     nb_planes = (draw->nb_planes - 1) | 1; /* eliminate alpha */
  464.     for (plane = 0; plane < nb_planes; plane++) {
  465.         nb_comp = draw->pixelstep[plane];
  466.         p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
  467.         w_sub = mask_w;
  468.         h_sub = mask_h;
  469.         x_sub = x0;
  470.         y_sub = y0;
  471.         subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
  472.         subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
  473.         for (comp = 0; comp < nb_comp; comp++) {
  474.             if (!component_used(draw, plane, comp))
  475.                 continue;
  476.             p = p0 + comp;
  477.             m = mask;
  478.             if (top) {
  479.                 blend_line_hv(p, draw->pixelstep[plane],
  480.                               color->comp[plane].u8[comp], alpha,
  481.                               m, mask_linesize, l2depth, w_sub,
  482.                               draw->hsub[plane], draw->vsub[plane],
  483.                               xm0, left, right, top);
  484.                 p += dst_linesize[plane];
  485.                 m += top * mask_linesize;
  486.             }
  487.             for (y = 0; y < h_sub; y++) {
  488.                 blend_line_hv(p, draw->pixelstep[plane],
  489.                               color->comp[plane].u8[comp], alpha,
  490.                               m, mask_linesize, l2depth, w_sub,
  491.                               draw->hsub[plane], draw->vsub[plane],
  492.                               xm0, left, right, 1 << draw->vsub[plane]);
  493.                 p += dst_linesize[plane];
  494.                 m += mask_linesize << draw->vsub[plane];
  495.             }
  496.             if (bottom)
  497.                 blend_line_hv(p, draw->pixelstep[plane],
  498.                               color->comp[plane].u8[comp], alpha,
  499.                               m, mask_linesize, l2depth, w_sub,
  500.                               draw->hsub[plane], draw->vsub[plane],
  501.                               xm0, left, right, bottom);
  502.         }
  503.     }
  504. }
  505.  
  506. int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir,
  507.                          int value)
  508. {
  509.     unsigned shift = sub_dir ? draw->vsub_max : draw->hsub_max;
  510.  
  511.     if (!shift)
  512.         return value;
  513.     if (round_dir >= 0)
  514.         value += round_dir ? (1 << shift) - 1 : 1 << (shift - 1);
  515.     return (value >> shift) << shift;
  516. }
  517.  
  518. AVFilterFormats *ff_draw_supported_pixel_formats(unsigned flags)
  519. {
  520.     enum AVPixelFormat i, pix_fmts[AV_PIX_FMT_NB + 1];
  521.     unsigned n = 0;
  522.     FFDrawContext draw;
  523.  
  524.     for (i = 0; i < AV_PIX_FMT_NB; i++)
  525.         if (ff_draw_init(&draw, i, flags) >= 0)
  526.             pix_fmts[n++] = i;
  527.     pix_fmts[n++] = AV_PIX_FMT_NONE;
  528.     return ff_make_format_list(pix_fmts);
  529. }
  530.  
  531. #ifdef TEST
  532.  
  533. #undef printf
  534.  
  535. int main(void)
  536. {
  537.     enum AVPixelFormat f;
  538.     const AVPixFmtDescriptor *desc;
  539.     FFDrawContext draw;
  540.     FFDrawColor color;
  541.     int r, i;
  542.  
  543.     for (f = 0; f < AV_PIX_FMT_NB; f++) {
  544.         desc = av_pix_fmt_desc_get(f);
  545.         if (!desc->name)
  546.             continue;
  547.         printf("Testing %s...%*s", desc->name,
  548.                (int)(16 - strlen(desc->name)), "");
  549.         r = ff_draw_init(&draw, f, 0);
  550.         if (r < 0) {
  551.             char buf[128];
  552.             av_strerror(r, buf, sizeof(buf));
  553.             printf("no: %s\n", buf);
  554.             continue;
  555.         }
  556.         ff_draw_color(&draw, &color, (uint8_t[]) { 1, 0, 0, 1 });
  557.         for (i = 0; i < sizeof(color); i++)
  558.             if (((uint8_t *)&color)[i] != 128)
  559.                 break;
  560.         if (i == sizeof(color)) {
  561.             printf("fallback color\n");
  562.             continue;
  563.         }
  564.         printf("ok\n");
  565.     }
  566.     return 0;
  567. }
  568.  
  569. #endif
  570.