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FFmpeg/libavfilter/drawutils.c
wm4 d6fc031caf avutil/pixdesc: deprecate AV_PIX_FMT_FLAG_PSEUDOPAL 
PSEUDOPAL pixel formats are not paletted, but carried a palette with the
intention of allowing code to treat unpaletted formats as paletted. The
palette simply mapped the byte values to the resulting RGB values,
making it some sort of LUT for RGB conversion.

It was used for 1 byte formats only: RGB4_BYTE, BGR4_BYTE, RGB8, BGR8,
GRAY8. The first 4 are awfully obscure, used only by some ancient bitmap
formats. The last one, GRAY8, is more common, but its treatment is
grossly incorrect. It considers full range GRAY8 only, so GRAY8 coming
from typical Y video planes was not mapped to the correct RGB values.
This cannot be fixed, because AVFrame.color_range can be freely changed
at runtime, and there is nothing to ensure the pseudo palette is
updated.

Also, nothing actually used the PSEUDOPAL palette data, except xwdenc
(trivially changed in the previous commit). All other code had to treat
it as a special case, just to ignore or to propagate palette data.

In conclusion, this was just a very strange old mechnaism that has no
real justification to exist anymore (although it may have been nice and
useful in the past). Now it's an artifact that makes the API harder to
use: API users who allocate their own pixel data have to be aware that
they need to allocate the palette, or FFmpeg will crash on them in
_some_ situations. On top of this, there was no API to allocate the
pseuo palette outside of av_frame_get_buffer().

This patch not only deprecates AV_PIX_FMT_FLAG_PSEUDOPAL, but also makes
the pseudo palette optional. Nothing accesses it anymore, though if it's
set, it's propagated. It's still allocated and initialized for
compatibility with API users that rely on this feature. But new API
users do not need to allocate it. This was an explicit goal of this
patch.

Most changes replace AV_PIX_FMT_FLAG_PSEUDOPAL with FF_PSEUDOPAL. I
first tried #ifdefing all code, but it was a mess. The FF_PSEUDOPAL
macro reduces the mess, and still allows defining FF_API_PSEUDOPAL to 0.

Passes FATE with FF_API_PSEUDOPAL enabled and disabled. In addition,
FATE passes with FF_API_PSEUDOPAL set to 1, but with allocation
functions manually changed to not allocating a palette.
2018-04-03 17:53:00 +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_GBRAP10LE:
case AV_PIX_FMT_GBRAP10BE:
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 | FF_PSEUDOPAL | AV_PIX_FMT_FLAG_ALPHA))
return AVERROR(ENOSYS);
if (format == AV_PIX_FMT_P010LE || format == AV_PIX_FMT_P010BE || format == AV_PIX_FMT_P016LE || format == AV_PIX_FMT_P016BE)
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 ||
draw->format == AV_PIX_FMT_GRAY16LE || draw->format == AV_PIX_FMT_YA16LE ||
draw->format == AV_PIX_FMT_GRAY9LE ||
draw->format == AV_PIX_FMT_GRAY10LE ||
draw->format == AV_PIX_FMT_GRAY12LE) {
const AVPixFmtDescriptor *desc = draw->desc;
color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
EXPAND(0);
color->comp[1].u8[0] = rgba[3];
EXPAND(1);
} 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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