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FFmpeg/libavfilter/drawutils.c

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  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/avassert.h"

  25. #include "libavutil/avutil.h"

  26. #include "libavutil/colorspace.h"

  27. #include "libavutil/intreadwrite.h"

  28. #include "libavutil/mem.h"

  29. #include "libavutil/pixdesc.h"

  30. #include "drawutils.h"

  31. #include "formats.h"

  32. 

  33. enum { RED = 0, GREEN, BLUE, ALPHA };

  34. 

  35. int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)

  36. {

  37.     switch (pix_fmt) {

  38.     case AV_PIX_FMT_0RGB:

  39.     case AV_PIX_FMT_ARGB:  rgba_map[ALPHA] = 0; rgba_map[RED  ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;

  40.     case AV_PIX_FMT_0BGR:

  41.     case AV_PIX_FMT_ABGR:  rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED  ] = 3; break;

  42.     case AV_PIX_FMT_RGB48LE:

  43.     case AV_PIX_FMT_RGB48BE:

  44.     case AV_PIX_FMT_RGBA64BE:

  45.     case AV_PIX_FMT_RGBA64LE:

  46.     case AV_PIX_FMT_RGB0:

  47.     case AV_PIX_FMT_RGBA:

  48.     case AV_PIX_FMT_RGB24: rgba_map[RED  ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;

  49.     case AV_PIX_FMT_BGR48LE:

  50.     case AV_PIX_FMT_BGR48BE:

  51.     case AV_PIX_FMT_BGRA64BE:

  52.     case AV_PIX_FMT_BGRA64LE:

  53.     case AV_PIX_FMT_BGRA:

  54.     case AV_PIX_FMT_BGR0:

  55.     case AV_PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 1; rgba_map[RED  ] = 2; rgba_map[ALPHA] = 3; break;

  56.     case AV_PIX_FMT_GBRP9LE:

  57.     case AV_PIX_FMT_GBRP9BE:

  58.     case AV_PIX_FMT_GBRP10LE:

  59.     case AV_PIX_FMT_GBRP10BE:

  60.     case AV_PIX_FMT_GBRP12LE:

  61.     case AV_PIX_FMT_GBRP12BE:

  62.     case AV_PIX_FMT_GBRP14LE:

  63.     case AV_PIX_FMT_GBRP14BE:

  64.     case AV_PIX_FMT_GBRP16LE:

  65.     case AV_PIX_FMT_GBRP16BE:

  66.     case AV_PIX_FMT_GBRAP:

  67.     case AV_PIX_FMT_GBRAP10LE:

  68.     case AV_PIX_FMT_GBRAP10BE:

  69.     case AV_PIX_FMT_GBRAP12LE:

  70.     case AV_PIX_FMT_GBRAP12BE:

  71.     case AV_PIX_FMT_GBRAP16LE:

  72.     case AV_PIX_FMT_GBRAP16BE:

  73.     case AV_PIX_FMT_GBRP:  rgba_map[GREEN] = 0; rgba_map[BLUE ] = 1; rgba_map[RED  ] = 2; rgba_map[ALPHA] = 3; break;

  74.     default:                    /* unsupported */

  75.         return AVERROR(EINVAL);

  76.     }

  77.     return 0;

  78. }

  79. 

  80. int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4],

  81.                             enum AVPixelFormat pix_fmt, uint8_t rgba_color[4],

  82.                             int *is_packed_rgba, uint8_t rgba_map_ptr[4])

  83. {

  84.     uint8_t rgba_map[4] = {0};

  85.     int i;

  86.     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(pix_fmt);

  87.     int hsub;

  88. 

  89.     av_assert0(pix_desc);

  90. 

  91.     hsub = pix_desc->log2_chroma_w;

  92. 

  93.     *is_packed_rgba = ff_fill_rgba_map(rgba_map, pix_fmt) >= 0;

  94. 

  95.     if (*is_packed_rgba) {

  96.         pixel_step[0] = (av_get_bits_per_pixel(pix_desc))>>3;

  97.         for (i = 0; i < 4; i++)

  98.             dst_color[rgba_map[i]] = rgba_color[i];

  99. 

  100.         line[0] = av_malloc_array(w, pixel_step[0]);

  101.         if (!line[0])

  102.             return AVERROR(ENOMEM);

  103.         for (i = 0; i < w; i++)

  104.             memcpy(line[0] + i * pixel_step[0], dst_color, pixel_step[0]);

  105.         if (rgba_map_ptr)

  106.             memcpy(rgba_map_ptr, rgba_map, sizeof(rgba_map[0]) * 4);

  107.     } else {

  108.         int plane;

  109. 

  110.         dst_color[0] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);

  111.         dst_color[1] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);

  112.         dst_color[2] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);

  113.         dst_color[3] = rgba_color[3];

  114. 

  115.         for (plane = 0; plane < 4; plane++) {

  116.             int line_size;

  117.             int hsub1 = (plane == 1 || plane == 2) ? hsub : 0;

  118. 

  119.             pixel_step[plane] = 1;

  120.             line_size = AV_CEIL_RSHIFT(w, hsub1) * pixel_step[plane];

  121.             line[plane] = av_malloc(line_size);

  122.             if (!line[plane]) {

  123.                 while(plane && line[plane-1])

  124.                     av_freep(&line[--plane]);

  125.                 return AVERROR(ENOMEM);

  126.             }

  127.             memset(line[plane], dst_color[plane], line_size);

  128.         }

  129.     }

  130. 

  131.     return 0;

  132. }

  133. 

  134. void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4],

  135.                        uint8_t *src[4], int pixelstep[4],

  136.                        int hsub, int vsub, int x, int y, int w, int h)

  137. {

  138.     int i, plane;

  139.     uint8_t *p;

  140. 

  141.     for (plane = 0; plane < 4 && dst[plane]; plane++) {

  142.         int hsub1 = plane == 1 || plane == 2 ? hsub : 0;

  143.         int vsub1 = plane == 1 || plane == 2 ? vsub : 0;

  144.         int width  = AV_CEIL_RSHIFT(w, hsub1);

  145.         int height = AV_CEIL_RSHIFT(h, vsub1);

  146. 

  147.         p = dst[plane] + (y >> vsub1) * dst_linesize[plane];

  148.         for (i = 0; i < height; i++) {

  149.             memcpy(p + (x >> hsub1) * pixelstep[plane],

  150.                    src[plane], width * pixelstep[plane]);

  151.             p += dst_linesize[plane];

  152.         }

  153.     }

  154. }

  155. 

  156. void ff_copy_rectangle(uint8_t *dst[4], int dst_linesize[4],

  157.                        uint8_t *src[4], int src_linesize[4], int pixelstep[4],

  158.                        int hsub, int vsub, int x, int y, int y2, int w, int h)

  159. {

  160.     int i, plane;

  161.     uint8_t *p;

  162. 

  163.     for (plane = 0; plane < 4 && dst[plane]; plane++) {

  164.         int hsub1 = plane == 1 || plane == 2 ? hsub : 0;

  165.         int vsub1 = plane == 1 || plane == 2 ? vsub : 0;

  166.         int width  = AV_CEIL_RSHIFT(w, hsub1);

  167.         int height = AV_CEIL_RSHIFT(h, vsub1);

  168. 

  169.         p = dst[plane] + (y >> vsub1) * dst_linesize[plane];

  170.         for (i = 0; i < height; i++) {

  171.             memcpy(p + (x >> hsub1) * pixelstep[plane],

  172.                    src[plane] + src_linesize[plane]*(i+(y2>>vsub1)), width * pixelstep[plane]);

  173.             p += dst_linesize[plane];

  174.         }

  175.     }

  176. }

  177. 

  178. int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)

  179. {

  180.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);

  181.     const AVComponentDescriptor *c;

  182.     unsigned i, nb_planes = 0;

  183.     int pixelstep[MAX_PLANES] = { 0 };

  184. 

  185.     if (!desc || !desc->name)

  186.         return AVERROR(EINVAL);

  187.     if (desc->flags & ~(AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_RGB | FF_PSEUDOPAL | AV_PIX_FMT_FLAG_ALPHA))

  188.         return AVERROR(ENOSYS);

  189.     if (format == AV_PIX_FMT_P010LE || format == AV_PIX_FMT_P010BE || format == AV_PIX_FMT_P016LE || format == AV_PIX_FMT_P016BE)

  190.         return AVERROR(ENOSYS);

  191.     for (i = 0; i < desc->nb_components; i++) {

  192.         c = &desc->comp[i];

  193.         /* for now, only 8-16 bits formats */

  194.         if (c->depth < 8 || c->depth > 16)

  195.             return AVERROR(ENOSYS);

  196.         if (desc->flags & AV_PIX_FMT_FLAG_BE)

  197.             return AVERROR(ENOSYS);

  198.         if (c->plane >= MAX_PLANES)

  199.             return AVERROR(ENOSYS);

  200.         /* strange interleaving */

  201.         if (pixelstep[c->plane] != 0 &&

  202.             pixelstep[c->plane] != c->step)

  203.             return AVERROR(ENOSYS);

  204.         if (pixelstep[c->plane] == 6 &&

  205.             c->depth == 16)

  206.             return AVERROR(ENOSYS);

  207.         pixelstep[c->plane] = c->step;

  208.         if (pixelstep[c->plane] >= 8)

  209.             return AVERROR(ENOSYS);

  210.         nb_planes = FFMAX(nb_planes, c->plane + 1);

  211.     }

  212.     memset(draw, 0, sizeof(*draw));

  213.     draw->desc      = desc;

  214.     draw->format    = format;

  215.     draw->nb_planes = nb_planes;

  216.     draw->flags     = flags;

  217.     memcpy(draw->pixelstep, pixelstep, sizeof(draw->pixelstep));

  218.     draw->hsub[1] = draw->hsub[2] = draw->hsub_max = desc->log2_chroma_w;

  219.     draw->vsub[1] = draw->vsub[2] = draw->vsub_max = desc->log2_chroma_h;

  220.     for (i = 0; i < (desc->nb_components - !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(flags & FF_DRAW_PROCESS_ALPHA))); i++)

  221.         draw->comp_mask[desc->comp[i].plane] |=

  222.             1 << desc->comp[i].offset;

  223.     return 0;

  224. }

  225. 

  226. void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])

  227. {

  228.     unsigned i;

  229.     uint8_t rgba_map[4];

  230. 

  231.     if (rgba != color->rgba)

  232.         memcpy(color->rgba, rgba, sizeof(color->rgba));

  233.     if ((draw->desc->flags & AV_PIX_FMT_FLAG_RGB) &&

  234.         ff_fill_rgba_map(rgba_map, draw->format) >= 0) {

  235.         if (draw->nb_planes == 1) {

  236.             for (i = 0; i < 4; i++) {

  237.                 color->comp[0].u8[rgba_map[i]] = rgba[i];

  238.                 if (draw->desc->comp[rgba_map[i]].depth > 8) {

  239.                     color->comp[0].u16[rgba_map[i]] = color->comp[0].u8[rgba_map[i]] << 8;

  240.                 }

  241.             }

  242.         } else {

  243.             for (i = 0; i < 4; i++) {

  244.                 color->comp[rgba_map[i]].u8[0] = rgba[i];

  245.                 if (draw->desc->comp[rgba_map[i]].depth > 8)

  246.                     color->comp[rgba_map[i]].u16[0] = color->comp[rgba_map[i]].u8[0] << (draw->desc->comp[rgba_map[i]].depth - 8);

  247.             }

  248.         }

  249.     } else if (draw->nb_planes >= 2) {

  250.         /* assume YUV */

  251.         const AVPixFmtDescriptor *desc = draw->desc;

  252.         color->comp[desc->comp[0].plane].u8[desc->comp[0].offset] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);

  253.         color->comp[desc->comp[1].plane].u8[desc->comp[1].offset] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);

  254.         color->comp[desc->comp[2].plane].u8[desc->comp[2].offset] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);

  255.         color->comp[3].u8[0] = rgba[3];

  256. #define EXPAND(compn) \

  257.         if (desc->comp[compn].depth > 8) \

  258.             color->comp[desc->comp[compn].plane].u16[desc->comp[compn].offset] = \

  259.             color->comp[desc->comp[compn].plane].u8[desc->comp[compn].offset] << \

  260.                 (draw->desc->comp[compn].depth + draw->desc->comp[compn].shift - 8)

  261.         EXPAND(3);

  262.         EXPAND(2);

  263.         EXPAND(1);

  264.         EXPAND(0);

  265.     } else if (draw->format == AV_PIX_FMT_GRAY8 || draw->format == AV_PIX_FMT_GRAY8A ||

  266.                draw->format == AV_PIX_FMT_GRAY16LE || draw->format == AV_PIX_FMT_YA16LE ||

  267.                draw->format == AV_PIX_FMT_GRAY9LE  ||

  268.                draw->format == AV_PIX_FMT_GRAY10LE ||

  269.                draw->format == AV_PIX_FMT_GRAY12LE) {

  270.         const AVPixFmtDescriptor *desc = draw->desc;

  271.         color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);

  272.         EXPAND(0);

  273.         color->comp[1].u8[0] = rgba[3];

  274.         EXPAND(1);

  275.     } else {

  276.         av_log(NULL, AV_LOG_WARNING,

  277.                "Color conversion not implemented for %s\n", draw->desc->name);

  278.         memset(color, 128, sizeof(*color));

  279.     }

  280. }

  281. 

  282. static uint8_t *pointer_at(FFDrawContext *draw, uint8_t *data[], int linesize[],

  283.                            int plane, int x, int y)

  284. {

  285.     return data[plane] +

  286.            (y >> draw->vsub[plane]) * linesize[plane] +

  287.            (x >> draw->hsub[plane]) * draw->pixelstep[plane];

  288. }

  289. 

  290. void ff_copy_rectangle2(FFDrawContext *draw,

  291.                         uint8_t *dst[], int dst_linesize[],

  292.                         uint8_t *src[], int src_linesize[],

  293.                         int dst_x, int dst_y, int src_x, int src_y,

  294.                         int w, int h)

  295. {

  296.     int plane, y, wp, hp;

  297.     uint8_t *p, *q;

  298. 

  299.     for (plane = 0; plane < draw->nb_planes; plane++) {

  300.         p = pointer_at(draw, src, src_linesize, plane, src_x, src_y);

  301.         q = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);

  302.         wp = AV_CEIL_RSHIFT(w, draw->hsub[plane]) * draw->pixelstep[plane];

  303.         hp = AV_CEIL_RSHIFT(h, draw->vsub[plane]);

  304.         for (y = 0; y < hp; y++) {

  305.             memcpy(q, p, wp);

  306.             p += src_linesize[plane];

  307.             q += dst_linesize[plane];

  308.         }

  309.     }

  310. }

  311. 

  312. void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color,

  313.                        uint8_t *dst[], int dst_linesize[],

  314.                        int dst_x, int dst_y, int w, int h)

  315. {

  316.     int plane, x, y, wp, hp;

  317.     uint8_t *p0, *p;

  318.     FFDrawColor color_tmp = *color;

  319. 

  320.     for (plane = 0; plane < draw->nb_planes; plane++) {

  321.         p0 = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);

  322.         wp = AV_CEIL_RSHIFT(w, draw->hsub[plane]);

  323.         hp = AV_CEIL_RSHIFT(h, draw->vsub[plane]);

  324.         if (!hp)

  325.             return;

  326.         p = p0;

  327. 

  328.         if (HAVE_BIGENDIAN && draw->desc->comp[0].depth > 8) {

  329.             for (x = 0; 2*x < draw->pixelstep[plane]; x++)

  330.                 color_tmp.comp[plane].u16[x] = av_bswap16(color_tmp.comp[plane].u16[x]);

  331.         }

  332. 

  333.         /* copy first line from color */

  334.         for (x = 0; x < wp; x++) {

  335.             memcpy(p, color_tmp.comp[plane].u8, draw->pixelstep[plane]);

  336.             p += draw->pixelstep[plane];

  337.         }

  338.         wp *= draw->pixelstep[plane];

  339.         /* copy next lines from first line */

  340.         p = p0 + dst_linesize[plane];

  341.         for (y = 1; y < hp; y++) {

  342.             memcpy(p, p0, wp);

  343.             p += dst_linesize[plane];

  344.         }

  345.     }

  346. }

  347. 

  348. /**

  349.  * Clip interval [x; x+w[ within [0; wmax[.

  350.  * The resulting w may be negative if the final interval is empty.

  351.  * dx, if not null, return the difference between in and out value of x.

  352.  */

  353. static void clip_interval(int wmax, int *x, int *w, int *dx)

  354. {

  355.     if (dx)

  356.         *dx = 0;

  357.     if (*x < 0) {

  358.         if (dx)

  359.             *dx = -*x;

  360.         *w += *x;

  361.         *x = 0;

  362.     }

  363.     if (*x + *w > wmax)

  364.         *w = wmax - *x;

  365. }

  366. 

  367. /**

  368.  * Decompose w pixels starting at x

  369.  * into start + (w starting at x) + end

  370.  * with x and w aligned on multiples of 1<<sub.

  371.  */

  372. static void subsampling_bounds(int sub, int *x, int *w, int *start, int *end)

  373. {

  374.     int mask = (1 << sub) - 1;

  375. 

  376.     *start = (-*x) & mask;

  377.     *x += *start;

  378.     *start = FFMIN(*start, *w);

  379.     *w -= *start;

  380.     *end = *w & mask;

  381.     *w >>= sub;

  382. }

  383. 

  384. static int component_used(FFDrawContext *draw, int plane, int comp)

  385. {

  386.     return (draw->comp_mask[plane] >> comp) & 1;

  387. }

  388. 

  389. /* If alpha is in the [ 0 ; 0x1010101 ] range,

  390.    then alpha * value is in the [ 0 ; 0xFFFFFFFF ] range,

  391.    and >> 24 gives a correct rounding. */

  392. static void blend_line(uint8_t *dst, unsigned src, unsigned alpha,

  393.                        int dx, int w, unsigned hsub, int left, int right)

  394. {

  395.     unsigned asrc = alpha * src;

  396.     unsigned tau = 0x1010101 - alpha;

  397.     int x;

  398. 

  399.     if (left) {

  400.         unsigned suba = (left * alpha) >> hsub;

  401.         *dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;

  402.         dst += dx;

  403.     }

  404.     for (x = 0; x < w; x++) {

  405.         *dst = (*dst * tau + asrc) >> 24;

  406.         dst += dx;

  407.     }

  408.     if (right) {

  409.         unsigned suba = (right * alpha) >> hsub;

  410.         *dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;

  411.     }

  412. }

  413. 

  414. static void blend_line16(uint8_t *dst, unsigned src, unsigned alpha,

  415.                          int dx, int w, unsigned hsub, int left, int right)

  416. {

  417.     unsigned asrc = alpha * src;

  418.     unsigned tau = 0x10001 - alpha;

  419.     int x;

  420. 

  421.     if (left) {

  422.         unsigned suba = (left * alpha) >> hsub;

  423.         uint16_t value = AV_RL16(dst);

  424.         AV_WL16(dst, (value * (0x10001 - suba) + src * suba) >> 16);

  425.         dst += dx;

  426.     }

  427.     for (x = 0; x < w; x++) {

  428.         uint16_t value = AV_RL16(dst);

  429.         AV_WL16(dst, (value * tau + asrc) >> 16);

  430.         dst += dx;

  431.     }

  432.     if (right) {

  433.         unsigned suba = (right * alpha) >> hsub;

  434.         uint16_t value = AV_RL16(dst);

  435.         AV_WL16(dst, (value * (0x10001 - suba) + src * suba) >> 16);

  436.     }

  437. }

  438. 

  439. void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color,

  440.                         uint8_t *dst[], int dst_linesize[],

  441.                         int dst_w, int dst_h,

  442.                         int x0, int y0, int w, int h)

  443. {

  444.     unsigned alpha, nb_planes, nb_comp, plane, comp;

  445.     int w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;

  446.     uint8_t *p0, *p;

  447. 

  448.     /* TODO optimize if alpha = 0xFF */

  449.     clip_interval(dst_w, &x0, &w, NULL);

  450.     clip_interval(dst_h, &y0, &h, NULL);

  451.     if (w <= 0 || h <= 0 || !color->rgba[3])

  452.         return;

  453.     if (draw->desc->comp[0].depth <= 8) {

  454.         /* 0x10203 * alpha + 2 is in the [ 2 ; 0x1010101 - 2 ] range */

  455.         alpha = 0x10203 * color->rgba[3] + 0x2;

  456.     } else {

  457.         /* 0x101 * alpha is in the [ 2 ; 0x1001] range */

  458.         alpha = 0x101 * color->rgba[3] + 0x2;

  459.     }

  460.     nb_planes = draw->nb_planes - !!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));

  461.     nb_planes += !nb_planes;

  462.     for (plane = 0; plane < nb_planes; plane++) {

  463.         nb_comp = draw->pixelstep[plane];

  464.         p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);

  465.         w_sub = w;

  466.         h_sub = h;

  467.         x_sub = x0;

  468.         y_sub = y0;

  469.         subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);

  470.         subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);

  471.         for (comp = 0; comp < nb_comp; comp++) {

  472.             const int depth = draw->desc->comp[comp].depth;

  473. 

  474.             if (!component_used(draw, plane, comp))

  475.                 continue;

  476.             p = p0 + comp;

  477.             if (top) {

  478.                 if (depth <= 8) {

  479.                     blend_line(p, color->comp[plane].u8[comp], alpha >> 1,

  480.                                draw->pixelstep[plane], w_sub,

  481.                                draw->hsub[plane], left, right);

  482.                 } else {

  483.                     blend_line16(p, color->comp[plane].u16[comp], alpha >> 1,

  484.                                  draw->pixelstep[plane], w_sub,

  485.                                  draw->hsub[plane], left, right);

  486.                 }

  487.                 p += dst_linesize[plane];

  488.             }

  489.             if (depth <= 8) {

  490.                 for (y = 0; y < h_sub; y++) {

  491.                     blend_line(p, color->comp[plane].u8[comp], alpha,

  492.                                draw->pixelstep[plane], w_sub,

  493.                                draw->hsub[plane], left, right);

  494.                     p += dst_linesize[plane];

  495.                 }

  496.             } else {

  497.                 for (y = 0; y < h_sub; y++) {

  498.                     blend_line16(p, color->comp[plane].u16[comp], alpha,

  499.                                  draw->pixelstep[plane], w_sub,

  500.                                  draw->hsub[plane], left, right);

  501.                     p += dst_linesize[plane];

  502.                 }

  503.             }

  504.             if (bottom) {

  505.                 if (depth <= 8) {

  506.                     blend_line(p, color->comp[plane].u8[comp], alpha >> 1,

  507.                                draw->pixelstep[plane], w_sub,

  508.                                draw->hsub[plane], left, right);

  509.                 } else {

  510.                     blend_line16(p, color->comp[plane].u16[comp], alpha >> 1,

  511.                                  draw->pixelstep[plane], w_sub,

  512.                                  draw->hsub[plane], left, right);

  513.                 }

  514.             }

  515.         }

  516.     }

  517. }

  518. 

  519. static void blend_pixel16(uint8_t *dst, unsigned src, unsigned alpha,

  520.                           const uint8_t *mask, int mask_linesize, int l2depth,

  521.                           unsigned w, unsigned h, unsigned shift, unsigned xm0)

  522. {

  523.     unsigned xm, x, y, t = 0;

  524.     unsigned xmshf = 3 - l2depth;

  525.     unsigned xmmod = 7 >> l2depth;

  526.     unsigned mbits = (1 << (1 << l2depth)) - 1;

  527.     unsigned mmult = 255 / mbits;

  528.     uint16_t value = AV_RL16(dst);

  529. 

  530.     for (y = 0; y < h; y++) {

  531.         xm = xm0;

  532.         for (x = 0; x < w; x++) {

  533.             t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)

  534.                  * mmult;

  535.             xm++;

  536.         }

  537.         mask += mask_linesize;

  538.     }

  539.     alpha = (t >> shift) * alpha;

  540.     AV_WL16(dst, ((0x10001 - alpha) * value + alpha * src) >> 16);

  541. }

  542. 

  543. static void blend_pixel(uint8_t *dst, unsigned src, unsigned alpha,

  544.                         const uint8_t *mask, int mask_linesize, int l2depth,

  545.                         unsigned w, unsigned h, unsigned shift, unsigned xm0)

  546. {

  547.     unsigned xm, x, y, t = 0;

  548.     unsigned xmshf = 3 - l2depth;

  549.     unsigned xmmod = 7 >> l2depth;

  550.     unsigned mbits = (1 << (1 << l2depth)) - 1;

  551.     unsigned mmult = 255 / mbits;

  552. 

  553.     for (y = 0; y < h; y++) {

  554.         xm = xm0;

  555.         for (x = 0; x < w; x++) {

  556.             t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)

  557.                  * mmult;

  558.             xm++;

  559.         }

  560.         mask += mask_linesize;

  561.     }

  562.     alpha = (t >> shift) * alpha;

  563.     *dst = ((0x1010101 - alpha) * *dst + alpha * src) >> 24;

  564. }

  565. 

  566. static void blend_line_hv16(uint8_t *dst, int dst_delta,

  567.                             unsigned src, unsigned alpha,

  568.                             const uint8_t *mask, int mask_linesize, int l2depth, int w,

  569.                             unsigned hsub, unsigned vsub,

  570.                             int xm, int left, int right, int hband)

  571. {

  572.     int x;

  573. 

  574.     if (left) {

  575.         blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,

  576.                       left, hband, hsub + vsub, xm);

  577.         dst += dst_delta;

  578.         xm += left;

  579.     }

  580.     for (x = 0; x < w; x++) {

  581.         blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,

  582.                       1 << hsub, hband, hsub + vsub, xm);

  583.         dst += dst_delta;

  584.         xm += 1 << hsub;

  585.     }

  586.     if (right)

  587.         blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,

  588.                       right, hband, hsub + vsub, xm);

  589. }

  590. 

  591. static void blend_line_hv(uint8_t *dst, int dst_delta,

  592.                           unsigned src, unsigned alpha,

  593.                           const uint8_t *mask, int mask_linesize, int l2depth, int w,

  594.                           unsigned hsub, unsigned vsub,

  595.                           int xm, int left, int right, int hband)

  596. {

  597.     int x;

  598. 

  599.     if (left) {

  600.         blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,

  601.                     left, hband, hsub + vsub, xm);

  602.         dst += dst_delta;

  603.         xm += left;

  604.     }

  605.     for (x = 0; x < w; x++) {

  606.         blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,

  607.                     1 << hsub, hband, hsub + vsub, xm);

  608.         dst += dst_delta;

  609.         xm += 1 << hsub;

  610.     }

  611.     if (right)

  612.         blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,

  613.                     right, hband, hsub + vsub, xm);

  614. }

  615. 

  616. void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color,

  617.                    uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h,

  618.                    const uint8_t *mask,  int mask_linesize, int mask_w, int mask_h,

  619.                    int l2depth, unsigned endianness, int x0, int y0)

  620. {

  621.     unsigned alpha, nb_planes, nb_comp, plane, comp;

  622.     int xm0, ym0, w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;

  623.     uint8_t *p0, *p;

  624.     const uint8_t *m;

  625. 

  626.     clip_interval(dst_w, &x0, &mask_w, &xm0);

  627.     clip_interval(dst_h, &y0, &mask_h, &ym0);

  628.     mask += ym0 * mask_linesize;

  629.     if (mask_w <= 0 || mask_h <= 0 || !color->rgba[3])

  630.         return;

  631.     if (draw->desc->comp[0].depth <= 8) {

  632.         /* alpha is in the [ 0 ; 0x10203 ] range,

  633.            alpha * mask is in the [ 0 ; 0x1010101 - 4 ] range */

  634.         alpha = (0x10307 * color->rgba[3] + 0x3) >> 8;

  635.     } else {

  636.         alpha = (0x101 * color->rgba[3] + 0x2) >> 8;

  637.     }

  638.     nb_planes = draw->nb_planes - !!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));

  639.     nb_planes += !nb_planes;

  640.     for (plane = 0; plane < nb_planes; plane++) {

  641.         nb_comp = draw->pixelstep[plane];

  642.         p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);

  643.         w_sub = mask_w;

  644.         h_sub = mask_h;

  645.         x_sub = x0;

  646.         y_sub = y0;

  647.         subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);

  648.         subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);

  649.         for (comp = 0; comp < nb_comp; comp++) {

  650.             const int depth = draw->desc->comp[comp].depth;

  651. 

  652.             if (!component_used(draw, plane, comp))

  653.                 continue;

  654.             p = p0 + comp;

  655.             m = mask;

  656.             if (top) {

  657.                 if (depth <= 8) {

  658.                     blend_line_hv(p, draw->pixelstep[plane],

  659.                                   color->comp[plane].u8[comp], alpha,

  660.                                   m, mask_linesize, l2depth, w_sub,

  661.                                   draw->hsub[plane], draw->vsub[plane],

  662.                                   xm0, left, right, top);

  663.                 } else {

  664.                     blend_line_hv16(p, draw->pixelstep[plane],

  665.                                     color->comp[plane].u16[comp], alpha,

  666.                                     m, mask_linesize, l2depth, w_sub,

  667.                                     draw->hsub[plane], draw->vsub[plane],

  668.                                     xm0, left, right, top);

  669.                 }

  670.                 p += dst_linesize[plane];

  671.                 m += top * mask_linesize;

  672.             }

  673.             if (depth <= 8) {

  674.                 for (y = 0; y < h_sub; y++) {

  675.                     blend_line_hv(p, draw->pixelstep[plane],

  676.                                   color->comp[plane].u8[comp], alpha,

  677.                                   m, mask_linesize, l2depth, w_sub,

  678.                                   draw->hsub[plane], draw->vsub[plane],

  679.                                   xm0, left, right, 1 << draw->vsub[plane]);

  680.                     p += dst_linesize[plane];

  681.                     m += mask_linesize << draw->vsub[plane];

  682.                 }

  683.             } else {

  684.                 for (y = 0; y < h_sub; y++) {

  685.                     blend_line_hv16(p, draw->pixelstep[plane],

  686.                                     color->comp[plane].u16[comp], alpha,

  687.                                     m, mask_linesize, l2depth, w_sub,

  688.                                     draw->hsub[plane], draw->vsub[plane],

  689.                                     xm0, left, right, 1 << draw->vsub[plane]);

  690.                     p += dst_linesize[plane];

  691.                     m += mask_linesize << draw->vsub[plane];

  692.                 }

  693.             }

  694.             if (bottom) {

  695.                 if (depth <= 8) {

  696.                     blend_line_hv(p, draw->pixelstep[plane],

  697.                                   color->comp[plane].u8[comp], alpha,

  698.                                   m, mask_linesize, l2depth, w_sub,

  699.                                   draw->hsub[plane], draw->vsub[plane],

  700.                                   xm0, left, right, bottom);

  701.                 } else {

  702.                     blend_line_hv16(p, draw->pixelstep[plane],

  703.                                     color->comp[plane].u16[comp], alpha,

  704.                                     m, mask_linesize, l2depth, w_sub,

  705.                                     draw->hsub[plane], draw->vsub[plane],

  706.                                     xm0, left, right, bottom);

  707.                 }

  708.             }

  709.         }

  710.     }

  711. }

  712. 

  713. int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir,

  714.                          int value)

  715. {

  716.     unsigned shift = sub_dir ? draw->vsub_max : draw->hsub_max;

  717. 

  718.     if (!shift)

  719.         return value;

  720.     if (round_dir >= 0)

  721.         value += round_dir ? (1 << shift) - 1 : 1 << (shift - 1);

  722.     return (value >> shift) << shift;

  723. }

  724. 

  725. AVFilterFormats *ff_draw_supported_pixel_formats(unsigned flags)

  726. {

  727.     enum AVPixelFormat i;

  728.     FFDrawContext draw;

  729.     AVFilterFormats *fmts = NULL;

  730.     int ret;

  731. 

  732.     for (i = 0; av_pix_fmt_desc_get(i); i++)

  733.         if (ff_draw_init(&draw, i, flags) >= 0 &&

  734.             (ret = ff_add_format(&fmts, i)) < 0)

  735.             return NULL;

  736.     return fmts;

  737. }