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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_GBRPF32LE:

  74.     case AV_PIX_FMT_GBRPF32BE:

  75.     case AV_PIX_FMT_GBRAPF32LE:

  76.     case AV_PIX_FMT_GBRAPF32BE:

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

  78.     default:                    /* unsupported */

  79.         return AVERROR(EINVAL);

  80.     }

  81.     return 0;

  82. }

  83. 

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

  85. {

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

  87.     const AVComponentDescriptor *c;

  88.     unsigned i, nb_planes = 0;

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

  90.     int full_range = 0;

  91. 

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

  93.         return AVERROR(EINVAL);

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

  95.         return AVERROR(ENOSYS);

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

  97.         return AVERROR(ENOSYS);

  98.     if (format == AV_PIX_FMT_YUVJ420P || format == AV_PIX_FMT_YUVJ422P || format == AV_PIX_FMT_YUVJ444P ||

  99.         format == AV_PIX_FMT_YUVJ411P || format == AV_PIX_FMT_YUVJ440P)

  100.         full_range = 1;

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

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

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

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

  105.             return AVERROR(ENOSYS);

  106.         if (desc->flags & AV_PIX_FMT_FLAG_BE)

  107.             return AVERROR(ENOSYS);

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

  109.             return AVERROR(ENOSYS);

  110.         /* strange interleaving */

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

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

  113.             return AVERROR(ENOSYS);

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

  115.             c->depth == 16)

  116.             return AVERROR(ENOSYS);

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

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

  119.             return AVERROR(ENOSYS);

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

  121.     }

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

  123.     draw->desc      = desc;

  124.     draw->format    = format;

  125.     draw->nb_planes = nb_planes;

  126.     draw->flags     = flags;

  127.     draw->full_range = full_range;

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

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

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

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

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

  133.             1 << desc->comp[i].offset;

  134.     return 0;

  135. }

  136. 

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

  138. {

  139.     unsigned i;

  140.     uint8_t rgba_map[4];

  141. 

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

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

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

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

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

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

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

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

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

  151.                 }

  152.             }

  153.         } else {

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

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

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

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

  158.             }

  159.         }

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

  161.         /* assume YUV */

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

  163.         color->comp[desc->comp[0].plane].u8[desc->comp[0].offset] = draw->full_range ? RGB_TO_Y_JPEG(rgba[0], rgba[1], rgba[2]) : RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);

  164.         color->comp[desc->comp[1].plane].u8[desc->comp[1].offset] = draw->full_range ? RGB_TO_U_JPEG(rgba[0], rgba[1], rgba[2]) : RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);

  165.         color->comp[desc->comp[2].plane].u8[desc->comp[2].offset] = draw->full_range ? RGB_TO_V_JPEG(rgba[0], rgba[1], rgba[2]) : RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);

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

  167. #define EXPAND(compn) \

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

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

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

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

  172.         EXPAND(3);

  173.         EXPAND(2);

  174.         EXPAND(1);

  175.         EXPAND(0);

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

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

  178.                draw->format == AV_PIX_FMT_GRAY9LE  ||

  179.                draw->format == AV_PIX_FMT_GRAY10LE ||

  180.                draw->format == AV_PIX_FMT_GRAY12LE ||

  181.                draw->format == AV_PIX_FMT_GRAY14LE) {

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

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

  184.         EXPAND(0);

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

  186.         EXPAND(1);

  187.     } else {

  188.         av_log(NULL, AV_LOG_WARNING,

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

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

  191.     }

  192. }

  193. 

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

  195.                            int plane, int x, int y)

  196. {

  197.     return data[plane] +

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

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

  200. }

  201. 

  202. void ff_copy_rectangle2(FFDrawContext *draw,

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

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

  205.                         int dst_x, int dst_y, int src_x, int src_y,

  206.                         int w, int h)

  207. {

  208.     int plane, y, wp, hp;

  209.     uint8_t *p, *q;

  210. 

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

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

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

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

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

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

  217.             memcpy(q, p, wp);

  218.             p += src_linesize[plane];

  219.             q += dst_linesize[plane];

  220.         }

  221.     }

  222. }

  223. 

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

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

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

  227. {

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

  229.     uint8_t *p0, *p;

  230.     FFDrawColor color_tmp = *color;

  231. 

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

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

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

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

  236.         if (!hp)

  237.             return;

  238.         p = p0;

  239. 

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

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

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

  243.         }

  244. 

  245.         /* copy first line from color */

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

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

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

  249.         }

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

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

  252.         p = p0 + dst_linesize[plane];

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

  254.             memcpy(p, p0, wp);

  255.             p += dst_linesize[plane];

  256.         }

  257.     }

  258. }

  259. 

  260. /**

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

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

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

  264.  */

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

  266. {

  267.     if (dx)

  268.         *dx = 0;

  269.     if (*x < 0) {

  270.         if (dx)

  271.             *dx = -*x;

  272.         *w += *x;

  273.         *x = 0;

  274.     }

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

  276.         *w = wmax - *x;

  277. }

  278. 

  279. /**

  280.  * Decompose w pixels starting at x

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

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

  283.  */

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

  285. {

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

  287. 

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

  289.     *x += *start;

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

  291.     *w -= *start;

  292.     *end = *w & mask;

  293.     *w >>= sub;

  294. }

  295. 

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

  297. {

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

  299. }

  300. 

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

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

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

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

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

  306. {

  307.     unsigned asrc = alpha * src;

  308.     unsigned tau = 0x1010101 - alpha;

  309.     int x;

  310. 

  311.     if (left) {

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

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

  314.         dst += dx;

  315.     }

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

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

  318.         dst += dx;

  319.     }

  320.     if (right) {

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

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

  323.     }

  324. }

  325. 

  326. static void blend_line16(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 = 0x10001 - alpha;

  331.     int x;

  332. 

  333.     if (left) {

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

  335.         uint16_t value = AV_RL16(dst);

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

  337.         dst += dx;

  338.     }

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

  340.         uint16_t value = AV_RL16(dst);

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

  342.         dst += dx;

  343.     }

  344.     if (right) {

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

  346.         uint16_t value = AV_RL16(dst);

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

  348.     }

  349. }

  350. 

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

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

  353.                         int dst_w, int dst_h,

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

  355. {

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

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

  358.     uint8_t *p0, *p;

  359. 

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

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

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

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

  364.         return;

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

  366.         /* 0x10203 * alpha + 2 is in the [ 2 ; 0x1010101 - 2 ] range */

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

  368.     } else {

  369.         /* 0x101 * alpha is in the [ 2 ; 0x1001] range */

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

  371.     }

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

  373.     nb_planes += !nb_planes;

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

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

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

  377.         w_sub = w;

  378.         h_sub = h;

  379.         x_sub = x0;

  380.         y_sub = y0;

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

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

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

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

  385. 

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

  387.                 continue;

  388.             p = p0 + comp;

  389.             if (top) {

  390.                 if (depth <= 8) {

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

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

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

  394.                 } else {

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

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

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

  398.                 }

  399.                 p += dst_linesize[plane];

  400.             }

  401.             if (depth <= 8) {

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

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

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

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

  406.                     p += dst_linesize[plane];

  407.                 }

  408.             } else {

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

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

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

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

  413.                     p += dst_linesize[plane];

  414.                 }

  415.             }

  416.             if (bottom) {

  417.                 if (depth <= 8) {

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

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

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

  421.                 } else {

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

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

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

  425.                 }

  426.             }

  427.         }

  428.     }

  429. }

  430. 

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

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

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

  434. {

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

  436.     unsigned xmshf = 3 - l2depth;

  437.     unsigned xmmod = 7 >> l2depth;

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

  439.     unsigned mmult = 255 / mbits;

  440.     uint16_t value = AV_RL16(dst);

  441. 

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

  443.         xm = xm0;

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

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

  446.                  * mmult;

  447.             xm++;

  448.         }

  449.         mask += mask_linesize;

  450.     }

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

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

  453. }

  454. 

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

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

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

  458. {

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

  460.     unsigned xmshf = 3 - l2depth;

  461.     unsigned xmmod = 7 >> l2depth;

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

  463.     unsigned mmult = 255 / mbits;

  464. 

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

  466.         xm = xm0;

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

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

  469.                  * mmult;

  470.             xm++;

  471.         }

  472.         mask += mask_linesize;

  473.     }

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

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

  476. }

  477. 

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

  479.                             unsigned src, unsigned alpha,

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

  481.                             unsigned hsub, unsigned vsub,

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

  483. {

  484.     int x;

  485. 

  486.     if (left) {

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

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

  489.         dst += dst_delta;

  490.         xm += left;

  491.     }

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

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

  494.                       1 << hsub, hband, hsub + vsub, xm);

  495.         dst += dst_delta;

  496.         xm += 1 << hsub;

  497.     }

  498.     if (right)

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

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

  501. }

  502. 

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

  504.                           unsigned src, unsigned alpha,

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

  506.                           unsigned hsub, unsigned vsub,

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

  508. {

  509.     int x;

  510. 

  511.     if (left) {

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

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

  514.         dst += dst_delta;

  515.         xm += left;

  516.     }

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

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

  519.                     1 << hsub, hband, hsub + vsub, xm);

  520.         dst += dst_delta;

  521.         xm += 1 << hsub;

  522.     }

  523.     if (right)

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

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

  526. }

  527. 

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

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

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

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

  532. {

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

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

  535.     uint8_t *p0, *p;

  536.     const uint8_t *m;

  537. 

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

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

  540.     mask += ym0 * mask_linesize;

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

  542.         return;

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

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

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

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

  547.     } else {

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

  549.     }

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

  551.     nb_planes += !nb_planes;

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

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

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

  555.         w_sub = mask_w;

  556.         h_sub = mask_h;

  557.         x_sub = x0;

  558.         y_sub = y0;

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

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

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

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

  563. 

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

  565.                 continue;

  566.             p = p0 + comp;

  567.             m = mask;

  568.             if (top) {

  569.                 if (depth <= 8) {

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

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

  572.                                   m, mask_linesize, l2depth, w_sub,

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

  574.                                   xm0, left, right, top);

  575.                 } else {

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

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

  578.                                     m, mask_linesize, l2depth, w_sub,

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

  580.                                     xm0, left, right, top);

  581.                 }

  582.                 p += dst_linesize[plane];

  583.                 m += top * mask_linesize;

  584.             }

  585.             if (depth <= 8) {

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

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

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

  589.                                   m, mask_linesize, l2depth, w_sub,

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

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

  592.                     p += dst_linesize[plane];

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

  594.                 }

  595.             } else {

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

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

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

  599.                                     m, mask_linesize, l2depth, w_sub,

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

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

  602.                     p += dst_linesize[plane];

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

  604.                 }

  605.             }

  606.             if (bottom) {

  607.                 if (depth <= 8) {

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

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

  610.                                   m, mask_linesize, l2depth, w_sub,

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

  612.                                   xm0, left, right, bottom);

  613.                 } else {

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

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

  616.                                     m, mask_linesize, l2depth, w_sub,

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

  618.                                     xm0, left, right, bottom);

  619.                 }

  620.             }

  621.         }

  622.     }

  623. }

  624. 

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

  626.                          int value)

  627. {

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

  629. 

  630.     if (!shift)

  631.         return value;

  632.     if (round_dir >= 0)

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

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

  635. }

  636. 

  637. AVFilterFormats *ff_draw_supported_pixel_formats(unsigned flags)

  638. {

  639.     enum AVPixelFormat i;

  640.     FFDrawContext draw;

  641.     AVFilterFormats *fmts = NULL;

  642.     int ret;

  643. 

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

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

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

  647.             return NULL;

  648.     return fmts;

  649. }