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swscale: Fix scaling for unscaled dithered planar convertions.
This fixes some overflow in bright areas and ensures that the maximum brightness level is mapped to the maximum without cliping and without showing dither patterens in flat max brightness areas. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -341,6 +341,24 @@ DECLARE_ALIGNED(8, const uint8_t, dithers)[8][8][8]={
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{ 112, 16,104, 8,118, 22,110, 14,},
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}};
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uint16_t dither_scale[15][16]={
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{ 2, 3, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,},
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{ 2, 3, 7, 7, 13, 13, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,},
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{ 3, 3, 4, 15, 15, 29, 57, 57, 57, 113, 113, 113, 113, 113, 113, 113,},
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{ 3, 4, 4, 5, 31, 31, 61, 121, 241, 241, 241, 241, 481, 481, 481, 481,},
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{ 3, 4, 5, 5, 6, 63, 63, 125, 249, 497, 993, 993, 993, 993, 993, 1985,},
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{ 3, 5, 6, 6, 6, 7, 127, 127, 253, 505, 1009, 2017, 4033, 4033, 4033, 4033,},
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{ 3, 5, 6, 7, 7, 7, 8, 255, 255, 509, 1017, 2033, 4065, 8129,16257,16257,},
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{ 3, 5, 6, 8, 8, 8, 8, 9, 511, 511, 1021, 2041, 4081, 8161,16321,32641,},
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{ 3, 5, 7, 8, 9, 9, 9, 9, 10, 1023, 1023, 2045, 4089, 8177,16353,32705,},
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{ 3, 5, 7, 8, 10, 10, 10, 10, 10, 11, 2047, 2047, 4093, 8185,16369,32737,},
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{ 3, 5, 7, 8, 10, 11, 11, 11, 11, 11, 12, 4095, 4095, 8189,16377,32753,},
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{ 3, 5, 7, 9, 10, 12, 12, 12, 12, 12, 12, 13, 8191, 8191,16381,32761,},
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{ 3, 5, 7, 9, 10, 12, 13, 13, 13, 13, 13, 13, 14,16383,16383,32765,},
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{ 3, 5, 7, 9, 10, 12, 14, 14, 14, 14, 14, 14, 14, 15,32767,32767,},
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{ 3, 5, 7, 9, 11, 12, 14, 15, 15, 15, 15, 15, 15, 15, 16,65535,},
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};
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static av_always_inline void yuv2yuvX16inC_template(const int16_t *lumFilter, const int16_t **lumSrc, int lumFilterSize,
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const int16_t *chrFilter, const int16_t **chrSrc, int chrFilterSize,
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const int16_t **alpSrc, uint16_t *dest, uint16_t *uDest, uint16_t *vDest, uint16_t *aDest,
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@ -1858,21 +1876,22 @@ static int packedCopyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[
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}
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#define DITHER_COPY(dst, dstStride, src, srcStride, bswap)\
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uint16_t scale= dither_scale[dst_depth-1][src_depth-1];\
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int shift= src_depth-dst_depth + dither_scale[src_depth-2][dst_depth-1];\
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for (i = 0; i < height; i++) {\
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int shift= src_depth-dst_depth;\
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uint8_t *dither= dithers[src_depth-9][i&7];\
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for (j = 0; j < length-7; j+=8){\
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dst[j+0] = (bswap(src[j+0]) + dither[0])>>shift;\
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dst[j+1] = (bswap(src[j+1]) + dither[1])>>shift;\
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dst[j+2] = (bswap(src[j+2]) + dither[2])>>shift;\
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dst[j+3] = (bswap(src[j+3]) + dither[3])>>shift;\
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dst[j+4] = (bswap(src[j+4]) + dither[4])>>shift;\
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dst[j+5] = (bswap(src[j+5]) + dither[5])>>shift;\
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dst[j+6] = (bswap(src[j+6]) + dither[6])>>shift;\
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dst[j+7] = (bswap(src[j+7]) + dither[7])>>shift;\
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dst[j+0] = (bswap(src[j+0]) + dither[0])*scale>>shift;\
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dst[j+1] = (bswap(src[j+1]) + dither[1])*scale>>shift;\
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dst[j+2] = (bswap(src[j+2]) + dither[2])*scale>>shift;\
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dst[j+3] = (bswap(src[j+3]) + dither[3])*scale>>shift;\
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dst[j+4] = (bswap(src[j+4]) + dither[4])*scale>>shift;\
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dst[j+5] = (bswap(src[j+5]) + dither[5])*scale>>shift;\
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dst[j+6] = (bswap(src[j+6]) + dither[6])*scale>>shift;\
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dst[j+7] = (bswap(src[j+7]) + dither[7])*scale>>shift;\
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}\
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for (; j < length; j++)\
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dst[j] = (bswap(src[j]) + dither[j&7])>>shift;\
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dst[j] = (bswap(src[j]) + dither[j&7])*scale>>shift;\
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dst += dstStride;\
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src += srcStride;\
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}
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@ -1919,7 +1938,7 @@ static int planarCopyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[
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dstPtr2 += dstStride[plane]/2;
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srcPtr += srcStride[plane];
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}
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} else if (src_depth < dst_depth) {
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} else if (src_depth <= dst_depth) {
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for (i = 0; i < height; i++) {
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if(isBE(c->dstFormat)){
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for (j = 0; j < length; j++)
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