dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-14 21:09:55 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

dsp: WebPExtractGreen function for alpha decompression

Browse Source 
+ NEON implementation

Change-Id: I67204f99d6e4c5974718bdf21dad30381978f72c
This commit is contained in:
Pascal Massimino
2017-01-17 00:01:35 -08:00
parent db013a8d5c
commit 1c07a3c639
4 changed files with 39 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/dsp/alpha_processing_neon.c
View File

@ -161,6 +161,17 @@ static int ExtractAlpha_NEON(const uint8_t* argb, int argb_stride,
return (alpha_mask == 0xffffffffu);
}
static void ExtractGreen_NEON(const uint32_t* argb,
uint8_t* alpha, int size) {
int i;
for (i = 0; i + 16 <= size; i += 16) {
const uint8x16x4_t rgbX = vld4q_u8((const uint8_t*)(argb + i));
const uint8x16_t greens = rgbX.val[1];
vst1q_u8(alpha + i, greens);
}
for (; i < size; ++i) alpha[i] = (argb[i] >> 8) & 0xff;
}
//------------------------------------------------------------------------------
extern void WebPInitAlphaProcessingNEON(void);
@ -170,6 +181,7 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingNEON(void) {
WebPDispatchAlpha = DispatchAlpha_NEON;
WebPDispatchAlphaToGreen = DispatchAlphaToGreen_NEON;
WebPExtractAlpha = ExtractAlpha_NEON;
WebPExtractGreen = ExtractGreen_NEON;
}
#else // !WEBP_USE_NEON