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FFmpeg/libavfilter/drawutils.c

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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 "libavutil/avutil.h"
#include "libavutil/colorspace.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 PixelFormat pix_fmt)
{
switch (pix_fmt) {
case PIX_FMT_0RGB:
case PIX_FMT_ARGB: rgba_map[ALPHA] = 0; rgba_map[RED ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;
case PIX_FMT_0BGR:
case PIX_FMT_ABGR: rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED ] = 3; break;
case PIX_FMT_RGB0:
case PIX_FMT_RGBA:
case PIX_FMT_RGB24: rgba_map[RED ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;
case PIX_FMT_BGRA:
case PIX_FMT_BGR0:
case PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 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 PixelFormat 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_descriptors[pix_fmt];
int 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(w * pixel_step[0]);
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 = (w >> hsub1) * pixel_step[plane];
line[plane] = av_malloc(line_size);
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;
p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
for (i = 0; i < (h >> vsub1); i++) {
memcpy(p + (x >> hsub1) * pixelstep[plane],
src[plane], (w >> hsub1) * 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;
p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
for (i = 0; i < (h >> vsub1); i++) {
memcpy(p + (x >> hsub1) * pixelstep[plane],
src[plane] + src_linesize[plane]*(i+(y2>>vsub1)), (w >> hsub1) * pixelstep[plane]);
p += dst_linesize[plane];
}
}
}
int ff_draw_init(FFDrawContext *draw, enum PixelFormat format, unsigned flags)
{
const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[format];
const AVComponentDescriptor *c;
unsigned i, nb_planes = 0;
int pixelstep[MAX_PLANES] = { 0 };
if (!desc->name)
return AVERROR(EINVAL);
if (desc->flags & ~(PIX_FMT_PLANAR | PIX_FMT_RGB | PIX_FMT_PSEUDOPAL))
return AVERROR(ENOSYS);
for (i = 0; i < desc->nb_components; i++) {
c = &desc->comp[i];
/* for now, only 8-bits formats */
if (c->depth_minus1 != 8 - 1)
return AVERROR(ENOSYS);
if (c->plane >= MAX_PLANES)
return AVERROR(ENOSYS);
/* strange interleaving */
if (pixelstep[c->plane] != 0 &&
pixelstep[c->plane] != c->step_minus1 + 1)
return AVERROR(ENOSYS);
pixelstep[c->plane] = c->step_minus1 + 1;
if (pixelstep[c->plane] >= 8)
return AVERROR(ENOSYS);
nb_planes = FFMAX(nb_planes, c->plane + 1);
}
if ((desc->log2_chroma_w || desc->log2_chroma_h) && nb_planes < 3)
return AVERROR(ENOSYS); /* exclude NV12 and NV21 */
memset(draw, 0, sizeof(*draw));
draw->desc = desc;
draw->format = format;
draw->nb_planes = nb_planes;
memcpy(draw->pixelstep, pixelstep, sizeof(draw->pixelstep));
if (nb_planes >= 3 && !(desc->flags & PIX_FMT_RGB)) {
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 - 1) | 1); i++)
draw->comp_mask[desc->comp[i].plane] |=
1 << (desc->comp[i].offset_plus1 - 1);
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 & PIX_FMT_RGB) && draw->nb_planes == 1 &&
ff_fill_rgba_map(rgba_map, draw->format) >= 0) {
for (i = 0; i < 4; i++)
color->comp[0].u8[rgba_map[i]] = rgba[i];
} else if (draw->nb_planes == 3 || draw->nb_planes == 4) {
/* assume YUV */
color->comp[0].u8[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
color->comp[1].u8[0] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
color->comp[2].u8[0] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
color->comp[3].u8[0] = rgba[3];
} else if (draw->format == PIX_FMT_GRAY8 || draw->format == 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 {
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 = (w >> draw->hsub[plane]) * draw->pixelstep[plane];
hp = (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;
for (plane = 0; plane < draw->nb_planes; plane++) {
p0 = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
wp = (w >> draw->hsub[plane]);
hp = (h >> draw->vsub[plane]);
if (!hp)
return;
p = p0;
/* copy first line from color */
for (x = 0; x < wp; x++) {
memcpy(p, color->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;
src *= alpha;
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;
}
}
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;
/* 0x10203 * alpha + 2 is in the [ 2 ; 0x1010101 - 2 ] range */
alpha = 0x10203 * color->rgba[3] + 0x2;
nb_planes = (draw->nb_planes - 1) | 1; /* eliminate alpha */
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++) {
if (!component_used(draw, plane, comp))
continue;
p = p0 + comp;
if (top) {
blend_line(p, color->comp[plane].u8[comp], alpha >> 1,
draw->pixelstep[plane], w_sub,
draw->hsub[plane], left, right);
p += dst_linesize[plane];
}
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];
}
if (bottom)
blend_line(p, color->comp[plane].u8[comp], alpha >> 1,
draw->pixelstep[plane], w_sub,
draw->hsub[plane], left, right);
}
}
}
static void blend_pixel(uint8_t *dst, unsigned src, unsigned alpha,
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_hv(uint8_t *dst, int dst_delta,
unsigned src, unsigned alpha,
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,
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, *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;
/* alpha is in the [ 0 ; 0x10203 ] range,
alpha * mask is in the [ 0 ; 0x1010101 - 4 ] range */
alpha = (0x10307 * color->rgba[3] + 0x3) >> 8;
nb_planes = (draw->nb_planes - 1) | 1; /* eliminate alpha */
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++) {
if (!component_used(draw, plane, comp))
continue;
p = p0 + comp;
m = mask;
if (top) {
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);
p += dst_linesize[plane];
m += top * mask_linesize;
}
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];
}
if (bottom)
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);
}
}
}
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 PixelFormat i, pix_fmts[PIX_FMT_NB + 1];
unsigned n = 0;
FFDrawContext draw;
for (i = 0; i < PIX_FMT_NB; i++)
if (ff_draw_init(&draw, i, flags) >= 0)
pix_fmts[n++] = i;
pix_fmts[n++] = PIX_FMT_NONE;
return ff_make_format_list(pix_fmts);
}
#ifdef TEST
#undef printf
int main(void)
{
enum PixelFormat f;
const AVPixFmtDescriptor *desc;
FFDrawContext draw;
FFDrawColor color;
int r, i;
for (f = 0; f < PIX_FMT_NB; f++) {
desc = &av_pix_fmt_descriptors[f];
if (!desc->name)
continue;
printf("Testing %s...%*s", desc->name,
(int)(16 - strlen(desc->name)), "");
r = ff_draw_init(&draw, f, 0);
if (r < 0) {
char buf[128];
av_strerror(r, buf, sizeof(buf));
printf("no: %s\n", buf);
continue;
}
ff_draw_color(&draw, &color, (uint8_t[]) { 1, 0, 0, 1 });
for (i = 0; i < sizeof(color); i++)
if (((uint8_t *)&color)[i] != 128)
break;
if (i == sizeof(color)) {
printf("fallback color\n");
continue;
}
printf("ok\n");
}
return 0;
}
#endif
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