dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-16 22:09:57 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

introduce WebPMemToUint32 and WebPUint32ToMem for memory access

Browse Source 
it uses memcpy() when unaligned memory write is tricky

Change-Id: I5d966ca9d19e9b43ac90140fa487824116982874
This commit is contained in:
Pascal Massimino
2015-12-02 12:09:06 +01:00
parent 010ca3d10d
commit 2c08aac81a
11 changed files with 112 additions and 108 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
src/dsp/rescaler_sse2.c
View File

@ -84,7 +84,8 @@ static void RescalerImportRowExpandSSE2(WebPRescaler* const wrk,
while (1) {
const __m128i mult = _mm_cvtsi32_si128(((x_add - accum) << 16) | accum);
const __m128i out = _mm_madd_epi16(cur_pixels, mult);
*(uint32_t*)frow = _mm_cvtsi128_si32(out);
assert(sizeof(*frow) == sizeof(uint32_t));
WebPUint32ToMem((uint8_t*)frow, _mm_cvtsi128_si32(out));
frow += 1;
if (frow >= frow_end) break;
accum -= wrk->x_sub;
@ -131,7 +132,7 @@ static void RescalerImportRowShrinkSSE2(WebPRescaler* const wrk,
__m128i base = zero;
accum += wrk->x_add;
while (accum > 0) {
const __m128i A = _mm_cvtsi32_si128(*(int*)src);
const __m128i A = _mm_cvtsi32_si128(WebPMemToUint32(src));
src += 4;
base = _mm_unpacklo_epi8(A, zero);
// To avoid overflow, we need: base * x_add / x_sub < 32768