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FFmpeg/libavfilter/drawutils.c
Paul B Mahol 9d16e46d9e avfilter/drawutils: allow drawing opaque text on transparent background 
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2016-09-21 11:54:00 +02:00

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/*
* Copyright 2011 Stefano Sabatini <stefano.sabatini-lala poste it>
* Copyright 2012 Nicolas George <nicolas.george normalesup org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include "libavutil/avassert.h"
#include "libavutil/avutil.h"
#include "libavutil/colorspace.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "drawutils.h"
#include "formats.h"
enum { RED = 0, GREEN, BLUE, ALPHA };
int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
{
switch (pix_fmt) {
case AV_PIX_FMT_0RGB:
case AV_PIX_FMT_ARGB: rgba_map[ALPHA] = 0; rgba_map[RED ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;
case AV_PIX_FMT_0BGR:
case AV_PIX_FMT_ABGR: rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED ] = 3; break;
case AV_PIX_FMT_RGB48LE:
case AV_PIX_FMT_RGB48BE:
case AV_PIX_FMT_RGBA64BE:
case AV_PIX_FMT_RGBA64LE:
case AV_PIX_FMT_RGB0:
case AV_PIX_FMT_RGBA:
case AV_PIX_FMT_RGB24: rgba_map[RED ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;
case AV_PIX_FMT_BGR48LE:
case AV_PIX_FMT_BGR48BE:
case AV_PIX_FMT_BGRA64BE:
case AV_PIX_FMT_BGRA64LE:
case AV_PIX_FMT_BGRA:
case AV_PIX_FMT_BGR0:
case AV_PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 1; rgba_map[RED ] = 2; rgba_map[ALPHA] = 3; break;
case AV_PIX_FMT_GBRP9LE:
case AV_PIX_FMT_GBRP9BE:
case AV_PIX_FMT_GBRP10LE:
case AV_PIX_FMT_GBRP10BE:
case AV_PIX_FMT_GBRP12LE:
case AV_PIX_FMT_GBRP12BE:
case AV_PIX_FMT_GBRP14LE:
case AV_PIX_FMT_GBRP14BE:
case AV_PIX_FMT_GBRP16LE:
case AV_PIX_FMT_GBRP16BE:
case AV_PIX_FMT_GBRAP:
case AV_PIX_FMT_GBRAP12LE:
case AV_PIX_FMT_GBRAP12BE:
case AV_PIX_FMT_GBRAP16LE:
case AV_PIX_FMT_GBRAP16BE:
case AV_PIX_FMT_GBRP: rgba_map[GREEN] = 0; rgba_map[BLUE ] = 1; rgba_map[RED ] = 2; rgba_map[ALPHA] = 3; break;
default: /* unsupported */
return AVERROR(EINVAL);
}
return 0;
}
int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4],
enum AVPixelFormat pix_fmt, uint8_t rgba_color[4],
int *is_packed_rgba, uint8_t rgba_map_ptr[4])
{
uint8_t rgba_map[4] = {0};
int i;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(pix_fmt);
int hsub;
av_assert0(pix_desc);
hsub = pix_desc->log2_chroma_w;
*is_packed_rgba = ff_fill_rgba_map(rgba_map, pix_fmt) >= 0;
if (*is_packed_rgba) {
pixel_step[0] = (av_get_bits_per_pixel(pix_desc))>>3;
for (i = 0; i < 4; i++)
dst_color[rgba_map[i]] = rgba_color[i];
line[0] = av_malloc_array(w, pixel_step[0]);
if (!line[0])
return AVERROR(ENOMEM);
for (i = 0; i < w; i++)
memcpy(line[0] + i * pixel_step[0], dst_color, pixel_step[0]);
if (rgba_map_ptr)
memcpy(rgba_map_ptr, rgba_map, sizeof(rgba_map[0]) * 4);
} else {
int plane;
dst_color[0] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
dst_color[1] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
dst_color[2] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
dst_color[3] = rgba_color[3];
for (plane = 0; plane < 4; plane++) {
int line_size;
int hsub1 = (plane == 1 || plane == 2) ? hsub : 0;
pixel_step[plane] = 1;
line_size = AV_CEIL_RSHIFT(w, hsub1) * pixel_step[plane];
line[plane] = av_malloc(line_size);
if (!line[plane]) {
while(plane && line[plane-1])
av_freep(&line[--plane]);
return AVERROR(ENOMEM);
}
memset(line[plane], dst_color[plane], line_size);
}
}
return 0;
}
void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4],
uint8_t *src[4], int pixelstep[4],
int hsub, int vsub, int x, int y, int w, int h)
{
int i, plane;
uint8_t *p;
for (plane = 0; plane < 4 && dst[plane]; plane++) {
int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
int width = AV_CEIL_RSHIFT(w, hsub1);
int height = AV_CEIL_RSHIFT(h, vsub1);
p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
for (i = 0; i < height; i++) {
memcpy(p + (x >> hsub1) * pixelstep[plane],
src[plane], width * pixelstep[plane]);
p += dst_linesize[plane];
}
}
}
void ff_copy_rectangle(uint8_t *dst[4], int dst_linesize[4],
uint8_t *src[4], int src_linesize[4], int pixelstep[4],
int hsub, int vsub, int x, int y, int y2, int w, int h)
{
int i, plane;
uint8_t *p;
for (plane = 0; plane < 4 && dst[plane]; plane++) {
int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
int width = AV_CEIL_RSHIFT(w, hsub1);
int height = AV_CEIL_RSHIFT(h, vsub1);
p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
for (i = 0; i < height; i++) {
memcpy(p + (x >> hsub1) * pixelstep[plane],
src[plane] + src_linesize[plane]*(i+(y2>>vsub1)), width * pixelstep[plane]);
p += dst_linesize[plane];
}
}
}
int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
const AVComponentDescriptor *c;
unsigned i, nb_planes = 0;
int pixelstep[MAX_PLANES] = { 0 };
if (!desc || !desc->name)
return AVERROR(EINVAL);
if (desc->flags & ~(AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_RGB | AV_PIX_FMT_FLAG_PSEUDOPAL | AV_PIX_FMT_FLAG_ALPHA))
return AVERROR(ENOSYS);
if (format == AV_PIX_FMT_P010LE || format == AV_PIX_FMT_P010BE)
return AVERROR(ENOSYS);
for (i = 0; i < desc->nb_components; i++) {
c = &desc->comp[i];
/* for now, only 8-16 bits formats */
if (c->depth < 8 || c->depth > 16)
return AVERROR(ENOSYS);
if (desc->flags & AV_PIX_FMT_FLAG_BE)
return AVERROR(ENOSYS);
if (c->plane >= MAX_PLANES)
return AVERROR(ENOSYS);
/* strange interleaving */
if (pixelstep[c->plane] != 0 &&
pixelstep[c->plane] != c->step)
return AVERROR(ENOSYS);
if (pixelstep[c->plane] == 6 &&
c->depth == 16)
return AVERROR(ENOSYS);
pixelstep[c->plane] = c->step;
if (pixelstep[c->plane] >= 8)
return AVERROR(ENOSYS);
nb_planes = FFMAX(nb_planes, c->plane + 1);
}
memset(draw, 0, sizeof(*draw));
draw->desc = desc;
draw->format = format;
draw->nb_planes = nb_planes;
draw->flags = flags;
memcpy(draw->pixelstep, pixelstep, sizeof(draw->pixelstep));
draw->hsub[1] = draw->hsub[2] = draw->hsub_max = desc->log2_chroma_w;
draw->vsub[1] = draw->vsub[2] = draw->vsub_max = desc->log2_chroma_h;
for (i = 0; i < (desc->nb_components - !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(flags & FF_DRAW_PROCESS_ALPHA))); i++)
draw->comp_mask[desc->comp[i].plane] |=
1 << desc->comp[i].offset;
return 0;
}
void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
{
unsigned i;
uint8_t rgba_map[4];
if (rgba != color->rgba)
memcpy(color->rgba, rgba, sizeof(color->rgba));
if ((draw->desc->flags & AV_PIX_FMT_FLAG_RGB) &&
ff_fill_rgba_map(rgba_map, draw->format) >= 0) {
if (draw->nb_planes == 1) {
for (i = 0; i < 4; i++) {
color->comp[0].u8[rgba_map[i]] = rgba[i];
if (draw->desc->comp[rgba_map[i]].depth > 8) {
color->comp[0].u16[rgba_map[i]] = color->comp[0].u8[rgba_map[i]] << 8;
}
}
} else {
for (i = 0; i < 4; i++) {
color->comp[rgba_map[i]].u8[0] = rgba[i];
if (draw->desc->comp[rgba_map[i]].depth > 8)
color->comp[rgba_map[i]].u16[0] = color->comp[rgba_map[i]].u8[0] << (draw->desc->comp[rgba_map[i]].depth - 8);
}
}
} else if (draw->nb_planes >= 2) {
/* assume YUV */
const AVPixFmtDescriptor *desc = draw->desc;
color->comp[desc->comp[0].plane].u8[desc->comp[0].offset] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
color->comp[desc->comp[1].plane].u8[desc->comp[1].offset] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
color->comp[desc->comp[2].plane].u8[desc->comp[2].offset] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
color->comp[3].u8[0] = rgba[3];
#define EXPAND(compn) \
if (desc->comp[compn].depth > 8) \
color->comp[desc->comp[compn].plane].u16[desc->comp[compn].offset] = \
color->comp[desc->comp[compn].plane].u8[desc->comp[compn].offset] << \
(draw->desc->comp[compn].depth + draw->desc->comp[compn].shift - 8)
EXPAND(3);
EXPAND(2);
EXPAND(1);
EXPAND(0);
} else if (draw->format == AV_PIX_FMT_GRAY8 || draw->format == AV_PIX_FMT_GRAY8A) {
color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
color->comp[1].u8[0] = rgba[3];
} else if (draw->format == AV_PIX_FMT_GRAY16LE || draw->format == AV_PIX_FMT_YA16LE) {
color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
color->comp[0].u16[0] = color->comp[0].u8[0] << 8;
color->comp[1].u8[0] = rgba[3];
color->comp[1].u16[0] = color->comp[1].u8[0] << 8;
} else {
av_log(NULL, AV_LOG_WARNING,
"Color conversion not implemented for %s\n", draw->desc->name);
memset(color, 128, sizeof(*color));
}
}
static uint8_t *pointer_at(FFDrawContext *draw, uint8_t *data[], int linesize[],
int plane, int x, int y)
{
return data[plane] +
(y >> draw->vsub[plane]) * linesize[plane] +
(x >> draw->hsub[plane]) * draw->pixelstep[plane];
}
void ff_copy_rectangle2(FFDrawContext *draw,
uint8_t *dst[], int dst_linesize[],
uint8_t *src[], int src_linesize[],
int dst_x, int dst_y, int src_x, int src_y,
int w, int h)
{
int plane, y, wp, hp;
uint8_t *p, *q;
for (plane = 0; plane < draw->nb_planes; plane++) {
p = pointer_at(draw, src, src_linesize, plane, src_x, src_y);
q = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
wp = AV_CEIL_RSHIFT(w, draw->hsub[plane]) * draw->pixelstep[plane];
hp = AV_CEIL_RSHIFT(h, draw->vsub[plane]);
for (y = 0; y < hp; y++) {
memcpy(q, p, wp);
p += src_linesize[plane];
q += dst_linesize[plane];
}
}
}
void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color,
uint8_t *dst[], int dst_linesize[],
int dst_x, int dst_y, int w, int h)
{
int plane, x, y, wp, hp;
uint8_t *p0, *p;
FFDrawColor color_tmp = *color;
for (plane = 0; plane < draw->nb_planes; plane++) {
p0 = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
wp = AV_CEIL_RSHIFT(w, draw->hsub[plane]);
hp = AV_CEIL_RSHIFT(h, draw->vsub[plane]);
if (!hp)
return;
p = p0;
if (HAVE_BIGENDIAN && draw->desc->comp[0].depth > 8) {
for (x = 0; 2*x < draw->pixelstep[plane]; x++)
color_tmp.comp[plane].u16[x] = av_bswap16(color_tmp.comp[plane].u16[x]);
}
/* copy first line from color */
for (x = 0; x < wp; x++) {
memcpy(p, color_tmp.comp[plane].u8, draw->pixelstep[plane]);
p += draw->pixelstep[plane];
}
wp *= draw->pixelstep[plane];
/* copy next lines from first line */
p = p0 + dst_linesize[plane];
for (y = 1; y < hp; y++) {
memcpy(p, p0, wp);
p += dst_linesize[plane];
}
}
}
/**
* Clip interval [x; x+w[ within [0; wmax[.
* The resulting w may be negative if the final interval is empty.
* dx, if not null, return the difference between in and out value of x.
*/
static void clip_interval(int wmax, int *x, int *w, int *dx)
{
if (dx)
*dx = 0;
if (*x < 0) {
if (dx)
*dx = -*x;
*w += *x;
*x = 0;
}
if (*x + *w > wmax)
*w = wmax - *x;
}
/**
* Decompose w pixels starting at x
* into start + (w starting at x) + end
* with x and w aligned on multiples of 1<<sub.
*/
static void subsampling_bounds(int sub, int *x, int *w, int *start, int *end)
{
int mask = (1 << sub) - 1;
*start = (-*x) & mask;
*x += *start;
*start = FFMIN(*start, *w);
*w -= *start;
*end = *w & mask;
*w >>= sub;
}
static int component_used(FFDrawContext *draw, int plane, int comp)
{
return (draw->comp_mask[plane] >> comp) & 1;
}
/* If alpha is in the [ 0 ; 0x1010101 ] range,
then alpha * value is in the [ 0 ; 0xFFFFFFFF ] range,
and >> 24 gives a correct rounding. */
static void blend_line(uint8_t *dst, unsigned src, unsigned alpha,
int dx, int w, unsigned hsub, int left, int right)
{
unsigned asrc = alpha * src;
unsigned tau = 0x1010101 - alpha;
int x;
if (left) {
unsigned suba = (left * alpha) >> hsub;
*dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
dst += dx;
}
for (x = 0; x < w; x++) {
*dst = (*dst * tau + asrc) >> 24;
dst += dx;
}
if (right) {
unsigned suba = (right * alpha) >> hsub;
*dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
}
}
static void blend_line16(uint8_t *dst, unsigned src, unsigned alpha,
int dx, int w, unsigned hsub, int left, int right)
{
unsigned asrc = alpha * src;
unsigned tau = 0x10001 - alpha;
int x;
if (left) {
unsigned suba = (left * alpha) >> hsub;
uint16_t value = AV_RL16(dst);
AV_WL16(dst, (value * (0x10001 - suba) + src * suba) >> 16);
dst += dx;
}
for (x = 0; x < w; x++) {
uint16_t value = AV_RL16(dst);
AV_WL16(dst, (value * tau + asrc) >> 16);
dst += dx;
}
if (right) {
unsigned suba = (right * alpha) >> hsub;
uint16_t value = AV_RL16(dst);
AV_WL16(dst, (value * (0x10001 - suba) + src * suba) >> 16);
}
}
void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color,
uint8_t *dst[], int dst_linesize[],
int dst_w, int dst_h,
int x0, int y0, int w, int h)
{
unsigned alpha, nb_planes, nb_comp, plane, comp;
int w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;
uint8_t *p0, *p;
/* TODO optimize if alpha = 0xFF */
clip_interval(dst_w, &x0, &w, NULL);
clip_interval(dst_h, &y0, &h, NULL);
if (w <= 0 || h <= 0 || !color->rgba[3])
return;
if (draw->desc->comp[0].depth <= 8) {
/* 0x10203 * alpha + 2 is in the [ 2 ; 0x1010101 - 2 ] range */
alpha = 0x10203 * color->rgba[3] + 0x2;
} else {
/* 0x101 * alpha is in the [ 2 ; 0x1001] range */
alpha = 0x101 * color->rgba[3] + 0x2;
}
nb_planes = draw->nb_planes - !!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));
nb_planes += !nb_planes;
for (plane = 0; plane < nb_planes; plane++) {
nb_comp = draw->pixelstep[plane];
p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
w_sub = w;
h_sub = h;
x_sub = x0;
y_sub = y0;
subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
for (comp = 0; comp < nb_comp; comp++) {
const int depth = draw->desc->comp[comp].depth;
if (!component_used(draw, plane, comp))
continue;
p = p0 + comp;
if (top) {
if (depth <= 8) {
blend_line(p, color->comp[plane].u8[comp], alpha >> 1,
draw->pixelstep[plane], w_sub,
draw->hsub[plane], left, right);
} else {
blend_line16(p, color->comp[plane].u16[comp], alpha >> 1,
draw->pixelstep[plane], w_sub,
draw->hsub[plane], left, right);
}
p += dst_linesize[plane];
}
if (depth <= 8) {
for (y = 0; y < h_sub; y++) {
blend_line(p, color->comp[plane].u8[comp], alpha,
draw->pixelstep[plane], w_sub,
draw->hsub[plane], left, right);
p += dst_linesize[plane];
}
} else {
for (y = 0; y < h_sub; y++) {
blend_line16(p, color->comp[plane].u16[comp], alpha,
draw->pixelstep[plane], w_sub,
draw->hsub[plane], left, right);
p += dst_linesize[plane];
}
}
if (bottom) {
if (depth <= 8) {
blend_line(p, color->comp[plane].u8[comp], alpha >> 1,
draw->pixelstep[plane], w_sub,
draw->hsub[plane], left, right);
} else {
blend_line16(p, color->comp[plane].u16[comp], alpha >> 1,
draw->pixelstep[plane], w_sub,
draw->hsub[plane], left, right);
}
}
}
}
}
static void blend_pixel16(uint8_t *dst, unsigned src, unsigned alpha,
const uint8_t *mask, int mask_linesize, int l2depth,
unsigned w, unsigned h, unsigned shift, unsigned xm0)
{
unsigned xm, x, y, t = 0;
unsigned xmshf = 3 - l2depth;
unsigned xmmod = 7 >> l2depth;
unsigned mbits = (1 << (1 << l2depth)) - 1;
unsigned mmult = 255 / mbits;
uint16_t value = AV_RL16(dst);
for (y = 0; y < h; y++) {
xm = xm0;
for (x = 0; x < w; x++) {
t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)
* mmult;
xm++;
}
mask += mask_linesize;
}
alpha = (t >> shift) * alpha;
AV_WL16(dst, ((0x10001 - alpha) * value + alpha * src) >> 16);
}
static void blend_pixel(uint8_t *dst, unsigned src, unsigned alpha,
const uint8_t *mask, int mask_linesize, int l2depth,
unsigned w, unsigned h, unsigned shift, unsigned xm0)
{
unsigned xm, x, y, t = 0;
unsigned xmshf = 3 - l2depth;
unsigned xmmod = 7 >> l2depth;
unsigned mbits = (1 << (1 << l2depth)) - 1;
unsigned mmult = 255 / mbits;
for (y = 0; y < h; y++) {
xm = xm0;
for (x = 0; x < w; x++) {
t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)
* mmult;
xm++;
}
mask += mask_linesize;
}
alpha = (t >> shift) * alpha;
*dst = ((0x1010101 - alpha) * *dst + alpha * src) >> 24;
}
static void blend_line_hv16(uint8_t *dst, int dst_delta,
unsigned src, unsigned alpha,
const uint8_t *mask, int mask_linesize, int l2depth, int w,
unsigned hsub, unsigned vsub,
int xm, int left, int right, int hband)
{
int x;
if (left) {
blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,
left, hband, hsub + vsub, xm);
dst += dst_delta;
xm += left;
}
for (x = 0; x < w; x++) {
blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,
1 << hsub, hband, hsub + vsub, xm);
dst += dst_delta;
xm += 1 << hsub;
}
if (right)
blend_pixel16(dst, src, alpha, mask, mask_linesize, l2depth,
right, hband, hsub + vsub, xm);
}
static void blend_line_hv(uint8_t *dst, int dst_delta,
unsigned src, unsigned alpha,
const uint8_t *mask, int mask_linesize, int l2depth, int w,
unsigned hsub, unsigned vsub,
int xm, int left, int right, int hband)
{
int x;
if (left) {
blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
left, hband, hsub + vsub, xm);
dst += dst_delta;
xm += left;
}
for (x = 0; x < w; x++) {
blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
1 << hsub, hband, hsub + vsub, xm);
dst += dst_delta;
xm += 1 << hsub;
}
if (right)
blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
right, hband, hsub + vsub, xm);
}
void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color,
uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h,
const uint8_t *mask, int mask_linesize, int mask_w, int mask_h,
int l2depth, unsigned endianness, int x0, int y0)
{
unsigned alpha, nb_planes, nb_comp, plane, comp;
int xm0, ym0, w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;
uint8_t *p0, *p;
const uint8_t *m;
clip_interval(dst_w, &x0, &mask_w, &xm0);
clip_interval(dst_h, &y0, &mask_h, &ym0);
mask += ym0 * mask_linesize;
if (mask_w <= 0 || mask_h <= 0 || !color->rgba[3])
return;
if (draw->desc->comp[0].depth <= 8) {
/* alpha is in the [ 0 ; 0x10203 ] range,
alpha * mask is in the [ 0 ; 0x1010101 - 4 ] range */
alpha = (0x10307 * color->rgba[3] + 0x3) >> 8;
} else {
alpha = (0x101 * color->rgba[3] + 0x2) >> 8;
}
nb_planes = draw->nb_planes - !!(draw->desc->flags & AV_PIX_FMT_FLAG_ALPHA && !(draw->flags & FF_DRAW_PROCESS_ALPHA));
nb_planes += !nb_planes;
for (plane = 0; plane < nb_planes; plane++) {
nb_comp = draw->pixelstep[plane];
p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
w_sub = mask_w;
h_sub = mask_h;
x_sub = x0;
y_sub = y0;
subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
for (comp = 0; comp < nb_comp; comp++) {
const int depth = draw->desc->comp[comp].depth;
if (!component_used(draw, plane, comp))
continue;
p = p0 + comp;
m = mask;
if (top) {
if (depth <= 8) {
blend_line_hv(p, draw->pixelstep[plane],
color->comp[plane].u8[comp], alpha,
m, mask_linesize, l2depth, w_sub,
draw->hsub[plane], draw->vsub[plane],
xm0, left, right, top);
} else {
blend_line_hv16(p, draw->pixelstep[plane],
color->comp[plane].u16[comp], alpha,
m, mask_linesize, l2depth, w_sub,
draw->hsub[plane], draw->vsub[plane],
xm0, left, right, top);
}
p += dst_linesize[plane];
m += top * mask_linesize;
}
if (depth <= 8) {
for (y = 0; y < h_sub; y++) {
blend_line_hv(p, draw->pixelstep[plane],
color->comp[plane].u8[comp], alpha,
m, mask_linesize, l2depth, w_sub,
draw->hsub[plane], draw->vsub[plane],
xm0, left, right, 1 << draw->vsub[plane]);
p += dst_linesize[plane];
m += mask_linesize << draw->vsub[plane];
}
} else {
for (y = 0; y < h_sub; y++) {
blend_line_hv16(p, draw->pixelstep[plane],
color->comp[plane].u16[comp], alpha,
m, mask_linesize, l2depth, w_sub,
draw->hsub[plane], draw->vsub[plane],
xm0, left, right, 1 << draw->vsub[plane]);
p += dst_linesize[plane];
m += mask_linesize << draw->vsub[plane];
}
}
if (bottom) {
if (depth <= 8) {
blend_line_hv(p, draw->pixelstep[plane],
color->comp[plane].u8[comp], alpha,
m, mask_linesize, l2depth, w_sub,
draw->hsub[plane], draw->vsub[plane],
xm0, left, right, bottom);
} else {
blend_line_hv16(p, draw->pixelstep[plane],
color->comp[plane].u16[comp], alpha,
m, mask_linesize, l2depth, w_sub,
draw->hsub[plane], draw->vsub[plane],
xm0, left, right, bottom);
}
}
}
}
}
int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir,
int value)
{
unsigned shift = sub_dir ? draw->vsub_max : draw->hsub_max;
if (!shift)
return value;
if (round_dir >= 0)
value += round_dir ? (1 << shift) - 1 : 1 << (shift - 1);
return (value >> shift) << shift;
}
AVFilterFormats *ff_draw_supported_pixel_formats(unsigned flags)
{
enum AVPixelFormat i;
FFDrawContext draw;
AVFilterFormats *fmts = NULL;
int ret;
for (i = 0; av_pix_fmt_desc_get(i); i++)
if (ff_draw_init(&draw, i, flags) >= 0 &&
(ret = ff_add_format(&fmts, i)) < 0)
return NULL;
return fmts;
}
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