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libswscale: Re-factor ff_shuffle_filter_coefficients.

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Make the code more readable and follow the style guide.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Alan Kelly 2022-02-17 11:03:52 +01:00 committed by Michael Niedermayer
parent f1a5414c97
commit e534d98af3
1 changed files with 36 additions and 30 deletions
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66
libswscale/utils.c
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@ -278,42 +278,48 @@ static const FormatEntry format_entries[] = {
[AV_PIX_FMT_P416LE] = { 1, 1 },
};
int ff_shuffle_filter_coefficients(SwsContext *c, int *filterPos, int filterSize, int16_t *filter, int dstW){
int ff_shuffle_filter_coefficients(SwsContext *c, int *filterPos,
int filterSize, int16_t *filter,
int dstW)
{
#if ARCH_X86_64
int i, j, k, l;
int i, j, k;
int cpu_flags = av_get_cpu_flags();
// avx2 hscale filter processes 16 pixel blocks.
if (!filter || dstW % 16 != 0)
return 0;
if (EXTERNAL_AVX2_FAST(cpu_flags) && !(cpu_flags & AV_CPU_FLAG_SLOW_GATHER)) {
if ((c->srcBpc == 8) && (c->dstBpc <= 14)){
if (dstW % 16 == 0){
if (filter != NULL){
for (i = 0; i < dstW; i += 8){
FFSWAP(int, filterPos[i + 2], filterPos[i+4]);
FFSWAP(int, filterPos[i + 3], filterPos[i+5]);
}
if (filterSize > 4){
int16_t *tmp2 = av_malloc(dstW * filterSize * 2);
if (!tmp2)
return AVERROR(ENOMEM);
memcpy(tmp2, filter, dstW * filterSize * 2);
for (i = 0; i < dstW; i += 16){//pixel
for (k = 0; k < filterSize / 4; ++k){//fcoeff
for (j = 0; j < 16; ++j){//inner pixel
for (l = 0; l < 4; ++l){//coeff
int from = i * filterSize + j * filterSize + k * 4 + l;
int to = (i) * filterSize + j * 4 + l + k * 64;
filter[to] = tmp2[from];
}
}
}
}
av_free(tmp2);
}
}
}
if ((c->srcBpc == 8) && (c->dstBpc <= 14)) {
int16_t *filterCopy = NULL;
if (filterSize > 4) {
if (!FF_ALLOC_TYPED_ARRAY(filterCopy, dstW * filterSize))
return AVERROR(ENOMEM);
memcpy(filterCopy, filter, dstW * filterSize * sizeof(int16_t));
}
// Do not swap filterPos for pixels which won't be processed by
// the main loop.
for (i = 0; i + 8 <= dstW; i += 8) {
FFSWAP(int, filterPos[i + 2], filterPos[i + 4]);
FFSWAP(int, filterPos[i + 3], filterPos[i + 5]);
}
if (filterSize > 4) {
// 16 pixels are processed at a time.
for (i = 0; i + 16 <= dstW; i += 16) {
// 4 filter coeffs are processed at a time.
for (k = 0; k + 4 <= filterSize; k += 4) {
for (j = 0; j < 16; ++j) {
int from = (i + j) * filterSize + k;
int to = i * filterSize + j * 4 + k * 16;
memcpy(&filter[to], &filterCopy[from], 4 * sizeof(int16_t));
}
}
}
}
av_free(filterCopy);
}
}
return 0;
#endif
return 0;
}
int sws_isSupportedInput(enum AVPixelFormat pix_fmt)