diff options
Diffstat (limited to 'thirdparty/libwebp/src/dsp/lossless_enc.c')
| -rw-r--r-- | thirdparty/libwebp/src/dsp/lossless_enc.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/thirdparty/libwebp/src/dsp/lossless_enc.c b/thirdparty/libwebp/src/dsp/lossless_enc.c index 1408fbf580..9c36055afc 100644 --- a/thirdparty/libwebp/src/dsp/lossless_enc.c +++ b/thirdparty/libwebp/src/dsp/lossless_enc.c @@ -515,13 +515,17 @@ static WEBP_INLINE int ColorTransformDelta(int8_t color_pred, int8_t color) { return ((int)color_pred * color) >> 5; } +static WEBP_INLINE int8_t U32ToS8(uint32_t v) { + return (int8_t)(v & 0xff); +} + void VP8LTransformColor_C(const VP8LMultipliers* const m, uint32_t* data, int num_pixels) { int i; for (i = 0; i < num_pixels; ++i) { const uint32_t argb = data[i]; - const uint32_t green = argb >> 8; - const uint32_t red = argb >> 16; + const int8_t green = U32ToS8(argb >> 8); + const int8_t red = U32ToS8(argb >> 16); int new_red = red & 0xff; int new_blue = argb & 0xff; new_red -= ColorTransformDelta(m->green_to_red_, green); @@ -535,7 +539,7 @@ void VP8LTransformColor_C(const VP8LMultipliers* const m, uint32_t* data, static WEBP_INLINE uint8_t TransformColorRed(uint8_t green_to_red, uint32_t argb) { - const uint32_t green = argb >> 8; + const int8_t green = U32ToS8(argb >> 8); int new_red = argb >> 16; new_red -= ColorTransformDelta(green_to_red, green); return (new_red & 0xff); @@ -544,9 +548,9 @@ static WEBP_INLINE uint8_t TransformColorRed(uint8_t green_to_red, static WEBP_INLINE uint8_t TransformColorBlue(uint8_t green_to_blue, uint8_t red_to_blue, uint32_t argb) { - const uint32_t green = argb >> 8; - const uint32_t red = argb >> 16; - uint8_t new_blue = argb; + const int8_t green = U32ToS8(argb >> 8); + const int8_t red = U32ToS8(argb >> 16); + uint8_t new_blue = argb & 0xff; new_blue -= ColorTransformDelta(green_to_blue, green); new_blue -= ColorTransformDelta(red_to_blue, red); return (new_blue & 0xff); @@ -558,7 +562,7 @@ void VP8LCollectColorRedTransforms_C(const uint32_t* argb, int stride, while (tile_height-- > 0) { int x; for (x = 0; x < tile_width; ++x) { - ++histo[TransformColorRed(green_to_red, argb[x])]; + ++histo[TransformColorRed((uint8_t)green_to_red, argb[x])]; } argb += stride; } @@ -571,7 +575,8 @@ void VP8LCollectColorBlueTransforms_C(const uint32_t* argb, int stride, while (tile_height-- > 0) { int x; for (x = 0; x < tile_width; ++x) { - ++histo[TransformColorBlue(green_to_blue, red_to_blue, argb[x])]; + ++histo[TransformColorBlue((uint8_t)green_to_blue, (uint8_t)red_to_blue, + argb[x])]; } argb += stride; } |