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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_GBRAP12LE:

  68.     case AV_PIX_FMT_GBRAP12BE:

  69.     case AV_PIX_FMT_GBRAP16LE:

  70.     case AV_PIX_FMT_GBRAP16BE:

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

  72.     default:                    /* unsupported */

  73.         return AVERROR(EINVAL);

  74.     }

  75.     return 0;

  76. }

  77. 

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

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

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

  81. {

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

  83.     int i;

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

  85.     int hsub;

  86. 

  87.     av_assert0(pix_desc);

  88. 

  89.     hsub = pix_desc->log2_chroma_w;

  90. 

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

  92. 

  93.     if (*is_packed_rgba) {

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

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

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

  97. 

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

  99.         if (!line[0])

  100.             return AVERROR(ENOMEM);

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

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

  103.         if (rgba_map_ptr)

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

  105.     } else {

  106.         int plane;

  107. 

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

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

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

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

  112. 

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

  114.             int line_size;

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

  116. 

  117.             pixel_step[plane] = 1;

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

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

  120.             if (!line[plane]) {

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

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

  123.                 return AVERROR(ENOMEM);

  124.             }

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

  126.         }

  127.     }

  128. 

  129.     return 0;

  130. }

  131. 

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

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

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

  135. {

  136.     int i, plane;

  137.     uint8_t *p;

  138. 

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

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

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

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

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

  144. 

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

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

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

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

  149.             p += dst_linesize[plane];

  150.         }

  151.     }

  152. }

  153. 

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

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

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

  157. {

  158.     int i, plane;

  159.     uint8_t *p;

  160. 

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

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

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

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

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

  166. 

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

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

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

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

  171.             p += dst_linesize[plane];

  172.         }

  173.     }

  174. }

  175. 

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

  177. {

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

  179.     const AVComponentDescriptor *c;

  180.     unsigned i, nb_planes = 0;

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

  182. 

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

  184.         return AVERROR(EINVAL);

  185.     if (desc->flags & ~(AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_RGB | AV_PIX_FMT_FLAG_PSEUDOPAL | AV_PIX_FMT_FLAG_ALPHA))

  186.         return AVERROR(ENOSYS);

  187.     if (format == AV_PIX_FMT_P010LE || format == AV_PIX_FMT_P010BE)

  188.         return AVERROR(ENOSYS);

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

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

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

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

  193.             return AVERROR(ENOSYS);

  194.         if (desc->flags & AV_PIX_FMT_FLAG_BE)

  195.             return AVERROR(ENOSYS);

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

  197.             return AVERROR(ENOSYS);

  198.         /* strange interleaving */

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

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

  201.             return AVERROR(ENOSYS);

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

  203.             c->depth == 16)

  204.             return AVERROR(ENOSYS);

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

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

  207.             return AVERROR(ENOSYS);

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

  209.     }

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

  211.     draw->desc      = desc;

  212.     draw->format    = format;

  213.     draw->nb_planes = nb_planes;

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

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

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

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

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

  219.             1 << desc->comp[i].offset;

  220.     return 0;

  221. }

  222. 

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

  224. {

  225.     unsigned i;

  226.     uint8_t rgba_map[4];

  227. 

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

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

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

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

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

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

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

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

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

  237.                 }

  238.             }

  239.         } else {

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

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

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

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

  244.             }

  245.         }

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

  247.         /* assume YUV */

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

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

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

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

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

  253. #define EXPAND(compn) \

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

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

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

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

  258.         EXPAND(3);

  259.         EXPAND(2);

  260.         EXPAND(1);

  261.         EXPAND(0);

  262.     } else if (draw->format == AV_PIX_FMT_GRAY8 || draw->format == AV_PIX_FMT_GRAY8A) {

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

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

  265.     } else if (draw->format == AV_PIX_FMT_GRAY16LE || draw->format == AV_PIX_FMT_YA16LE) {

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

  267.         color->comp[0].u16[0] = color->comp[0].u8[0] << 8;

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

  269.         color->comp[1].u16[0] = color->comp[1].u8[0] << 8;

  270.     } else {

  271.         av_log(NULL, AV_LOG_WARNING,

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

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

  274.     }

  275. }

  276. 

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

  278.                            int plane, int x, int y)

  279. {

  280.     return data[plane] +

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

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

  283. }

  284. 

  285. void ff_copy_rectangle2(FFDrawContext *draw,

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

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

  288.                         int dst_x, int dst_y, int src_x, int src_y,

  289.                         int w, int h)

  290. {

  291.     int plane, y, wp, hp;

  292.     uint8_t *p, *q;

  293. 

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

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

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

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

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

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

  300.             memcpy(q, p, wp);

  301.             p += src_linesize[plane];

  302.             q += dst_linesize[plane];

  303.         }

  304.     }

  305. }

  306. 

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

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

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

  310. {

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

  312.     uint8_t *p0, *p;

  313.     FFDrawColor color_tmp = *color;

  314. 

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

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

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

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

  319.         if (!hp)

  320.             return;

  321.         p = p0;

  322. 

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

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

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

  326.         }

  327. 

  328.         /* copy first line from color */

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

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

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

  332.         }

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

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

  335.         p = p0 + dst_linesize[plane];

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

  337.             memcpy(p, p0, wp);

  338.             p += dst_linesize[plane];

  339.         }

  340.     }

  341. }

  342. 

  343. /**

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

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

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

  347.  */

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

  349. {

  350.     if (dx)

  351.         *dx = 0;

  352.     if (*x < 0) {

  353.         if (dx)

  354.             *dx = -*x;

  355.         *w += *x;

  356.         *x = 0;

  357.     }

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

  359.         *w = wmax - *x;

  360. }

  361. 

  362. /**

  363.  * Decompose w pixels starting at x

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

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

  366.  */

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

  368. {

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

  370. 

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

  372.     *x += *start;

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

  374.     *w -= *start;

  375.     *end = *w & mask;

  376.     *w >>= sub;

  377. }

  378. 

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

  380. {

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

  382. }

  383. 

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

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

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

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

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

  389. {

  390.     unsigned asrc = alpha * src;

  391.     unsigned tau = 0x1010101 - alpha;

  392.     int x;

  393. 

  394.     if (left) {

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

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

  397.         dst += dx;

  398.     }

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

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

  401.         dst += dx;

  402.     }

  403.     if (right) {

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

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

  406.     }

  407. }

  408. 

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

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

  411. {

  412.     unsigned asrc = alpha * src;

  413.     unsigned tau = 0x10001 - alpha;

  414.     int x;

  415. 

  416.     if (left) {

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

  418.         uint16_t value = AV_RL16(dst);

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

  420.         dst += dx;

  421.     }

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

  423.         uint16_t value = AV_RL16(dst);

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

  425.         dst += dx;

  426.     }

  427.     if (right) {

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

  429.         uint16_t value = AV_RL16(dst);

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

  431.     }

  432. }

  433. 

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

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

  436.                         int dst_w, int dst_h,

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

  438. {

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

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

  441.     uint8_t *p0, *p;

  442. 

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

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

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

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

  447.         return;

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

  449.         /* 0x10203 * alpha + 2 is in the [ 2 ; 0x1010101 - 2 ] range */

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

  451.     } else {

  452.         /* 0x101 * alpha is in the [ 2 ; 0x1001] range */

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

  454.     }

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

  456.     nb_planes += !nb_planes;

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

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

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

  460.         w_sub = w;

  461.         h_sub = h;

  462.         x_sub = x0;

  463.         y_sub = y0;

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

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

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

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

  468. 

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

  470.                 continue;

  471.             p = p0 + comp;

  472.             if (top) {

  473.                 if (depth <= 8) {

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

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

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

  477.                 } else {

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

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

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

  481.                 }

  482.                 p += dst_linesize[plane];

  483.             }

  484.             if (depth <= 8) {

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

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

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

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

  489.                     p += dst_linesize[plane];

  490.                 }

  491.             } else {

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

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

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

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

  496.                     p += dst_linesize[plane];

  497.                 }

  498.             }

  499.             if (bottom) {

  500.                 if (depth <= 8) {

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

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

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

  504.                 } else {

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

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

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

  508.                 }

  509.             }

  510.         }

  511.     }

  512. }

  513. 

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

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

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

  517. {

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

  519.     unsigned xmshf = 3 - l2depth;

  520.     unsigned xmmod = 7 >> l2depth;

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

  522.     unsigned mmult = 255 / mbits;

  523.     uint16_t value = AV_RL16(dst);

  524. 

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

  526.         xm = xm0;

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

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

  529.                  * mmult;

  530.             xm++;

  531.         }

  532.         mask += mask_linesize;

  533.     }

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

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

  536. }

  537. 

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

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

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

  541. {

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

  543.     unsigned xmshf = 3 - l2depth;

  544.     unsigned xmmod = 7 >> l2depth;

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

  546.     unsigned mmult = 255 / mbits;

  547. 

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

  549.         xm = xm0;

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

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

  552.                  * mmult;

  553.             xm++;

  554.         }

  555.         mask += mask_linesize;

  556.     }

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

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

  559. }

  560. 

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

  562.                             unsigned src, unsigned alpha,

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

  564.                             unsigned hsub, unsigned vsub,

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

  566. {

  567.     int x;

  568. 

  569.     if (left) {

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

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

  572.         dst += dst_delta;

  573.         xm += left;

  574.     }

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

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

  577.                       1 << hsub, hband, hsub + vsub, xm);

  578.         dst += dst_delta;

  579.         xm += 1 << hsub;

  580.     }

  581.     if (right)

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

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

  584. }

  585. 

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

  587.                           unsigned src, unsigned alpha,

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

  589.                           unsigned hsub, unsigned vsub,

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

  591. {

  592.     int x;

  593. 

  594.     if (left) {

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

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

  597.         dst += dst_delta;

  598.         xm += left;

  599.     }

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

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

  602.                     1 << hsub, hband, hsub + vsub, xm);

  603.         dst += dst_delta;

  604.         xm += 1 << hsub;

  605.     }

  606.     if (right)

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

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

  609. }

  610. 

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

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

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

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

  615. {

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

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

  618.     uint8_t *p0, *p;

  619.     const uint8_t *m;

  620. 

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

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

  623.     mask += ym0 * mask_linesize;

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

  625.         return;

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

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

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

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

  630.     } else {

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

  632.     }

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

  634.     nb_planes += !nb_planes;

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

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

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

  638.         w_sub = mask_w;

  639.         h_sub = mask_h;

  640.         x_sub = x0;

  641.         y_sub = y0;

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

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

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

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

  646. 

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

  648.                 continue;

  649.             p = p0 + comp;

  650.             m = mask;

  651.             if (top) {

  652.                 if (depth <= 8) {

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

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

  655.                                   m, mask_linesize, l2depth, w_sub,

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

  657.                                   xm0, left, right, top);

  658.                 } else {

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

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

  661.                                     m, mask_linesize, l2depth, w_sub,

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

  663.                                     xm0, left, right, top);

  664.                 }

  665.                 p += dst_linesize[plane];

  666.                 m += top * mask_linesize;

  667.             }

  668.             if (depth <= 8) {

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

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

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

  672.                                   m, mask_linesize, l2depth, w_sub,

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

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

  675.                     p += dst_linesize[plane];

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

  677.                 }

  678.             } else {

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

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

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

  682.                                     m, mask_linesize, l2depth, w_sub,

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

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

  685.                     p += dst_linesize[plane];

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

  687.                 }

  688.             }

  689.             if (bottom) {

  690.                 if (depth <= 8) {

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

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

  693.                                   m, mask_linesize, l2depth, w_sub,

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

  695.                                   xm0, left, right, bottom);

  696.                 } else {

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

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

  699.                                     m, mask_linesize, l2depth, w_sub,

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

  701.                                     xm0, left, right, bottom);

  702.                 }

  703.             }

  704.         }

  705.     }

  706. }

  707. 

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

  709.                          int value)

  710. {

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

  712. 

  713.     if (!shift)

  714.         return value;

  715.     if (round_dir >= 0)

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

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

  718. }

  719. 

  720. AVFilterFormats *ff_draw_supported_pixel_formats(unsigned flags)

  721. {

  722.     enum AVPixelFormat i;

  723.     FFDrawContext draw;

  724.     AVFilterFormats *fmts = NULL;

  725.     int ret;

  726. 

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

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

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

  730.             return NULL;

  731.     return fmts;

  732. }