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ffmpeg/libavutil/imgutils.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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/*
* 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
*/
/**
* @file
* misc image utilities
*/
#include "avassert.h"
#include "common.h"
#include "imgutils.h"
#include "imgutils_internal.h"
#include "internal.h"
#include "intreadwrite.h"
#include "log.h"
#include "mathematics.h"
#include "pixdesc.h"
#include "rational.h"
void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
const AVPixFmtDescriptor *pixdesc)
{
int i;
memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
if (max_pixstep_comps)
memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
for (i = 0; i < 4; i++) {
const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
if (comp->step > max_pixsteps[comp->plane]) {
max_pixsteps[comp->plane] = comp->step;
if (max_pixstep_comps)
max_pixstep_comps[comp->plane] = i;
}
}
}
static inline
int image_get_linesize(int width, int plane,
int max_step, int max_step_comp,
const AVPixFmtDescriptor *desc)
{
int s, shifted_w, linesize;
if (!desc)
return AVERROR(EINVAL);
if (width < 0)
return AVERROR(EINVAL);
s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0;
shifted_w = ((width + (1 << s) - 1)) >> s;
if (shifted_w && max_step > INT_MAX / shifted_w)
return AVERROR(EINVAL);
linesize = max_step * shifted_w;
if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM)
linesize = (linesize + 7) >> 3;
return linesize;
}
int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
int max_step [4]; /* max pixel step for each plane */
int max_step_comp[4]; /* the component for each plane which has the max pixel step */
if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
return AVERROR(EINVAL);
av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc);
}
int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
{
int i, ret;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
int max_step [4]; /* max pixel step for each plane */
int max_step_comp[4]; /* the component for each plane which has the max pixel step */
memset(linesizes, 0, 4*sizeof(linesizes[0]));
if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
return AVERROR(EINVAL);
av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
for (i = 0; i < 4; i++) {
if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0)
return ret;
linesizes[i] = ret;
}
return 0;
}
int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
uint8_t *ptr, const int linesizes[4])
{
int i, total_size, size[4] = { 0 }, has_plane[4] = { 0 };
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
memset(data , 0, sizeof(data[0])*4);
if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
return AVERROR(EINVAL);
data[0] = ptr;
if (linesizes[0] > (INT_MAX - 1024) / height)
return AVERROR(EINVAL);
size[0] = linesizes[0] * height;
if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
desc->flags & FF_PSEUDOPAL) {
data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */
return size[0] + 256 * 4;
}
for (i = 0; i < 4; i++)
has_plane[desc->comp[i].plane] = 1;
total_size = size[0];
for (i = 1; i < 4 && has_plane[i]; i++) {
int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
data[i] = data[i-1] + size[i-1];
h = (height + (1 << s) - 1) >> s;
if (linesizes[i] > INT_MAX / h)
return AVERROR(EINVAL);
size[i] = h * linesizes[i];
if (total_size > INT_MAX - size[i])
return AVERROR(EINVAL);
total_size += size[i];
}
return total_size;
}
int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
{
int i;
for (i = 0; i < 256; i++) {
int r, g, b;
switch (pix_fmt) {
case AV_PIX_FMT_RGB8:
r = (i>>5 )*36;
g = ((i>>2)&7)*36;
b = (i&3 )*85;
break;
case AV_PIX_FMT_BGR8:
b = (i>>6 )*85;
g = ((i>>3)&7)*36;
r = (i&7 )*36;
break;
case AV_PIX_FMT_RGB4_BYTE:
r = (i>>3 )*255;
g = ((i>>1)&3)*85;
b = (i&1 )*255;
break;
case AV_PIX_FMT_BGR4_BYTE:
b = (i>>3 )*255;
g = ((i>>1)&3)*85;
r = (i&1 )*255;
break;
case AV_PIX_FMT_GRAY8:
r = b = g = i;
break;
default:
return AVERROR(EINVAL);
}
pal[i] = b + (g << 8) + (r << 16) + (0xFFU << 24);
}
return 0;
}
int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
int w, int h, enum AVPixelFormat pix_fmt, int align)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
int i, ret;
uint8_t *buf;
if (!desc)
return AVERROR(EINVAL);
if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
return ret;
if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, align>7 ? FFALIGN(w, 8) : w)) < 0)
return ret;
for (i = 0; i < 4; i++)
linesizes[i] = FFALIGN(linesizes[i], align);
if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0)
return ret;
buf = av_malloc(ret + align);
if (!buf)
return AVERROR(ENOMEM);
if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
av_free(buf);
return ret;
}
if (desc->flags & AV_PIX_FMT_FLAG_PAL || (desc->flags & FF_PSEUDOPAL && pointers[1])) {
avpriv_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
if (align < 4) {
av_log(NULL, AV_LOG_ERROR, "Formats with a palette require a minimum alignment of 4\n");
return AVERROR(EINVAL);
}
}
if ((desc->flags & AV_PIX_FMT_FLAG_PAL ||
desc->flags & FF_PSEUDOPAL) && pointers[1] &&
pointers[1] - pointers[0] > linesizes[0] * h) {
/* zero-initialize the padding before the palette */
memset(pointers[0] + linesizes[0] * h, 0,
pointers[1] - pointers[0] - linesizes[0] * h);
}
return ret;
}
typedef struct ImgUtils {
const AVClass *class;
int log_offset;
void *log_ctx;
} ImgUtils;
static const AVClass imgutils_class = {
.class_name = "IMGUTILS",
.item_name = av_default_item_name,
.option = NULL,
.version = LIBAVUTIL_VERSION_INT,
.log_level_offset_offset = offsetof(ImgUtils, log_offset),
.parent_log_context_offset = offsetof(ImgUtils, log_ctx),
};
int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx)
{
ImgUtils imgutils = {
.class = &imgutils_class,
.log_offset = log_offset,
.log_ctx = log_ctx,
};
int64_t stride = av_image_get_linesize(pix_fmt, w, 0);
if (stride <= 0)
stride = 8LL*w;
stride += 128*8;
if ((int)w<=0 || (int)h<=0 || stride >= INT_MAX || stride*(uint64_t)(h+128) >= INT_MAX) {
av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
return AVERROR(EINVAL);
}
if (max_pixels < INT64_MAX) {
if (w*(int64_t)h > max_pixels) {
av_log(&imgutils, AV_LOG_ERROR,
"Picture size %ux%u exceeds specified max pixel count %"PRId64", see the documentation if you wish to increase it\n",
w, h, max_pixels);
return AVERROR(EINVAL);
}
}
return 0;
}
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
{
return av_image_check_size2(w, h, INT64_MAX, AV_PIX_FMT_NONE, log_offset, log_ctx);
}
int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar)
{
int64_t scaled_dim;
if (sar.den <= 0 || sar.num < 0)
return AVERROR(EINVAL);
if (!sar.num || sar.num == sar.den)
return 0;
if (sar.num < sar.den)
scaled_dim = av_rescale_rnd(w, sar.num, sar.den, AV_ROUND_ZERO);
else
scaled_dim = av_rescale_rnd(h, sar.den, sar.num, AV_ROUND_ZERO);
if (scaled_dim > 0)
return 0;
return AVERROR(EINVAL);
}
static void image_copy_plane(uint8_t *dst, ptrdiff_t dst_linesize,
const uint8_t *src, ptrdiff_t src_linesize,
ptrdiff_t bytewidth, int height)
{
if (!dst || !src)
return;
av_assert0(abs(src_linesize) >= bytewidth);
av_assert0(abs(dst_linesize) >= bytewidth);
for (;height > 0; height--) {
memcpy(dst, src, bytewidth);
dst += dst_linesize;
src += src_linesize;
}
}
static void image_copy_plane_uc_from(uint8_t *dst, ptrdiff_t dst_linesize,
const uint8_t *src, ptrdiff_t src_linesize,
ptrdiff_t bytewidth, int height)
{
int ret = -1;
#if ARCH_X86
ret = ff_image_copy_plane_uc_from_x86(dst, dst_linesize, src, src_linesize,
bytewidth, height);
#endif
if (ret < 0)
image_copy_plane(dst, dst_linesize, src, src_linesize, bytewidth, height);
}
void av_image_copy_plane(uint8_t *dst, int dst_linesize,
const uint8_t *src, int src_linesize,
int bytewidth, int height)
{
image_copy_plane(dst, dst_linesize, src, src_linesize, bytewidth, height);
}
static void image_copy(uint8_t *dst_data[4], const ptrdiff_t dst_linesizes[4],
const uint8_t *src_data[4], const ptrdiff_t src_linesizes[4],
enum AVPixelFormat pix_fmt, int width, int height,
void (*copy_plane)(uint8_t *, ptrdiff_t, const uint8_t *,
ptrdiff_t, ptrdiff_t, int))
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
return;
if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
desc->flags & FF_PSEUDOPAL) {
copy_plane(dst_data[0], dst_linesizes[0],
src_data[0], src_linesizes[0],
width, height);
/* copy the palette */
if ((desc->flags & AV_PIX_FMT_FLAG_PAL) || (dst_data[1] && src_data[1]))
memcpy(dst_data[1], src_data[1], 4*256);
} else {
int i, planes_nb = 0;
for (i = 0; i < desc->nb_components; i++)
planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
for (i = 0; i < planes_nb; i++) {
int h = height;
ptrdiff_t bwidth = av_image_get_linesize(pix_fmt, width, i);
if (bwidth < 0) {
av_log(NULL, AV_LOG_ERROR, "av_image_get_linesize failed\n");
return;
}
if (i == 1 || i == 2) {
h = AV_CEIL_RSHIFT(height, desc->log2_chroma_h);
}
copy_plane(dst_data[i], dst_linesizes[i],
src_data[i], src_linesizes[i],
bwidth, h);
}
}
}
void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
const uint8_t *src_data[4], const int src_linesizes[4],
enum AVPixelFormat pix_fmt, int width, int height)
{
ptrdiff_t dst_linesizes1[4], src_linesizes1[4];
int i;
for (i = 0; i < 4; i++) {
dst_linesizes1[i] = dst_linesizes[i];
src_linesizes1[i] = src_linesizes[i];
}
image_copy(dst_data, dst_linesizes1, src_data, src_linesizes1, pix_fmt,
width, height, image_copy_plane);
}
void av_image_copy_uc_from(uint8_t *dst_data[4], const ptrdiff_t dst_linesizes[4],
const uint8_t *src_data[4], const ptrdiff_t src_linesizes[4],
enum AVPixelFormat pix_fmt, int width, int height)
{
image_copy(dst_data, dst_linesizes, src_data, src_linesizes, pix_fmt,
width, height, image_copy_plane_uc_from);
}
int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4],
const uint8_t *src, enum AVPixelFormat pix_fmt,
int width, int height, int align)
{
int ret, i;
ret = av_image_check_size(width, height, 0, NULL);
if (ret < 0)
return ret;
ret = av_image_fill_linesizes(dst_linesize, pix_fmt, width);
if (ret < 0)
return ret;
for (i = 0; i < 4; i++)
dst_linesize[i] = FFALIGN(dst_linesize[i], align);
return av_image_fill_pointers(dst_data, pix_fmt, height, (uint8_t *)src, dst_linesize);
}
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt,
int width, int height, int align)
{
uint8_t *data[4];
int linesize[4];
int ret;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
if (!desc)
return AVERROR(EINVAL);
ret = av_image_check_size(width, height, 0, NULL);
if (ret < 0)
return ret;
// do not include palette for these pseudo-paletted formats
if (desc->flags & FF_PSEUDOPAL)
return FFALIGN(width, align) * height;
return av_image_fill_arrays(data, linesize, NULL, pix_fmt,
width, height, align);
}
int av_image_copy_to_buffer(uint8_t *dst, int dst_size,
const uint8_t * const src_data[4],
const int src_linesize[4],
enum AVPixelFormat pix_fmt,
int width, int height, int align)
{
int i, j, nb_planes = 0, linesize[4];
int size = av_image_get_buffer_size(pix_fmt, width, height, align);
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
int ret;
if (size > dst_size || size < 0 || !desc)
return AVERROR(EINVAL);
for (i = 0; i < desc->nb_components; i++)
nb_planes = FFMAX(desc->comp[i].plane, nb_planes);
nb_planes++;
ret = av_image_fill_linesizes(linesize, pix_fmt, width);
av_assert0(ret >= 0); // was checked previously
for (i = 0; i < nb_planes; i++) {
int h, shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
const uint8_t *src = src_data[i];
h = (height + (1 << shift) - 1) >> shift;
for (j = 0; j < h; j++) {
memcpy(dst, src, linesize[i]);
dst += FFALIGN(linesize[i], align);
src += src_linesize[i];
}
}
if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
uint32_t *d32 = (uint32_t *)dst;
for (i = 0; i<256; i++)
AV_WL32(d32 + i, AV_RN32(src_data[1] + 4*i));
}
return size;
}
// Fill dst[0..dst_size] with the bytes in clear[0..clear_size]. The clear
// bytes are repeated until dst_size is reached. If dst_size is unaligned (i.e.
// dst_size%clear_size!=0), the remaining data will be filled with the beginning
// of the clear data only.
static void memset_bytes(uint8_t *dst, size_t dst_size, uint8_t *clear,
size_t clear_size)
{
size_t pos = 0;
int same = 1;
int i;
if (!clear_size)
return;
// Reduce to memset() if possible.
for (i = 0; i < clear_size; i++) {
if (clear[i] != clear[0]) {
same = 0;
break;
}
}
if (same)
clear_size = 1;
if (clear_size == 1) {
memset(dst, clear[0], dst_size);
dst_size = 0;
} else if (clear_size == 2) {
uint16_t val = AV_RN16(clear);
for (; dst_size >= 2; dst_size -= 2) {
AV_WN16(dst, val);
dst += 2;
}
} else if (clear_size == 4) {
uint32_t val = AV_RN32(clear);
for (; dst_size >= 4; dst_size -= 4) {
AV_WN32(dst, val);
dst += 4;
}
} else if (clear_size == 8) {
uint32_t val = AV_RN64(clear);
for (; dst_size >= 8; dst_size -= 8) {
AV_WN64(dst, val);
dst += 8;
}
}
for (; dst_size; dst_size--)
*dst++ = clear[pos++ % clear_size];
}
// Maximum size in bytes of a plane element (usually a pixel, or multiple pixels
// if it's a subsampled packed format).
#define MAX_BLOCK_SIZE 32
int av_image_fill_black(uint8_t *dst_data[4], const ptrdiff_t dst_linesize[4],
enum AVPixelFormat pix_fmt, enum AVColorRange range,
int width, int height)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
int nb_planes = av_pix_fmt_count_planes(pix_fmt);
// A pixel or a group of pixels on each plane, with a value that represents black.
// Consider e.g. AV_PIX_FMT_UYVY422 for non-trivial cases.
uint8_t clear_block[4][MAX_BLOCK_SIZE] = {{0}}; // clear padding with 0
int clear_block_size[4] = {0};
ptrdiff_t plane_line_bytes[4] = {0};
int rgb, limited;
int plane, c;
if (!desc || nb_planes < 1 || nb_planes > 4 || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
return AVERROR(EINVAL);
rgb = !!(desc->flags & AV_PIX_FMT_FLAG_RGB);
limited = !rgb && range != AVCOL_RANGE_JPEG;
if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) {
ptrdiff_t bytewidth = av_image_get_linesize(pix_fmt, width, 0);
uint8_t *data;
int mono = pix_fmt == AV_PIX_FMT_MONOWHITE || pix_fmt == AV_PIX_FMT_MONOBLACK;
int fill = pix_fmt == AV_PIX_FMT_MONOWHITE ? 0xFF : 0;
if (nb_planes != 1 || !(rgb || mono) || bytewidth < 1)
return AVERROR(EINVAL);
if (!dst_data)
return 0;
data = dst_data[0];
// (Bitstream + alpha will be handled incorrectly - it'll remain transparent.)
for (;height > 0; height--) {
memset(data, fill, bytewidth);
data += dst_linesize[0];
}
return 0;
}
for (c = 0; c < desc->nb_components; c++) {
const AVComponentDescriptor comp = desc->comp[c];
// We try to operate on entire non-subsampled pixel groups (for
// AV_PIX_FMT_UYVY422 this would mean two consecutive pixels).
clear_block_size[comp.plane] = FFMAX(clear_block_size[comp.plane], comp.step);
if (clear_block_size[comp.plane] > MAX_BLOCK_SIZE)
return AVERROR(EINVAL);
}
// Create a byte array for clearing 1 pixel (sometimes several pixels).
for (c = 0; c < desc->nb_components; c++) {
const AVComponentDescriptor comp = desc->comp[c];
// (Multiple pixels happen e.g. with AV_PIX_FMT_UYVY422.)
int w = clear_block_size[comp.plane] / comp.step;
uint8_t *c_data[4];
const int c_linesize[4] = {0};
uint16_t src_array[MAX_BLOCK_SIZE];
uint16_t src = 0;
int x;
if (comp.depth > 16)
return AVERROR(EINVAL);
if (!rgb && comp.depth < 8)
return AVERROR(EINVAL);
if (w < 1)
return AVERROR(EINVAL);
if (c == 0 && limited) {
src = 16 << (comp.depth - 8);
} else if ((c == 1 || c == 2) && !rgb) {
src = 128 << (comp.depth - 8);
} else if (c == 3) {
// (Assume even limited YUV uses full range alpha.)
src = (1 << comp.depth) - 1;
}
for (x = 0; x < w; x++)
src_array[x] = src;
for (x = 0; x < 4; x++)
c_data[x] = &clear_block[x][0];
av_write_image_line(src_array, c_data, c_linesize, desc, 0, 0, c, w);
}
for (plane = 0; plane < nb_planes; plane++) {
plane_line_bytes[plane] = av_image_get_linesize(pix_fmt, width, plane);
if (plane_line_bytes[plane] < 0)
return AVERROR(EINVAL);
}
if (!dst_data)
return 0;
for (plane = 0; plane < nb_planes; plane++) {
size_t bytewidth = plane_line_bytes[plane];
uint8_t *data = dst_data[plane];
int chroma_div = plane == 1 || plane == 2 ? desc->log2_chroma_h : 0;
int plane_h = ((height + ( 1 << chroma_div) - 1)) >> chroma_div;
for (; plane_h > 0; plane_h--) {
memset_bytes(data, bytewidth, &clear_block[plane][0], clear_block_size[plane]);
data += dst_linesize[plane];
}
}
return 0;
}
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