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sw_common neon: Fix issue with unaligned memory.

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Neon operations should be performed on memory aligned to 8 bytes.
This commit fixes this issue and increase stability of neon rasterizer.
This commit is contained in:
Michal Szczecinski 2021-08-11 16:23:04 +02:00 • committed by Hermet Park
parent e1d5ade705
commit 359b7d0dbb
1 changed files with 17 additions and 11 deletions
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28
src/lib/sw_engine/tvgSwRasterNeon.h
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@ -53,33 +53,39 @@ static inline bool neonRasterTranslucentRle(SwSurface* surface, const SwRleData*
{
auto span = rle->spans;
uint32_t src;
uint8x8_t *vDst = NULL;
for (uint32_t i = 0; i < rle->size; ++i) {
auto dst = &surface->buffer[span->y * surface->stride + span->x];
uint32_t align = 0;
uint8x8_t *vDst = (uint8x8_t*) dst;
if ((((uint32_t) dst) & 0x7) != 0) {
vDst = (uint8x8_t*)(dst+1);
align = 1;
} else {
vDst = (uint8x8_t*) dst;
}
if (span->coverage < 255) src = ALPHA_BLEND(color, span->coverage);
else src = color;
auto ialpha = 255 - surface->blender.alpha(src);
uint8x8_t vSrc = (uint8x8_t) vdup_n_u32(src);
uint8x8_t vIalpha = (uint8x8_t) vdup_n_u32(ialpha);
uint8x8_t vIalpha = vdup_n_u8((uint8_t) ialpha);
uint32_t iterations = span->len / 2;
uint32_t left = span->len % 2;
uint32_t iterations = (span->len - align) / 2;
uint32_t left = (span->len - align) % 2;
for (uint32_t x = 0; x < iterations; x+=2) {
vDst[x] = vadd_u8(vSrc, ALPHA_BLEND_NEON(vDst[x], vIalpha));
}
//Fill not aligned byte
if (align) *dst = src + ALPHA_BLEND(*dst, ialpha);
for (uint32_t x = 0; x < iterations; ++x) vDst[x] = vadd_u8(vSrc, ALPHA_BLEND_NEON(vDst[x], vIalpha));
if (left) dst[span->len - 1] = src + ALPHA_BLEND(dst[span->len - 1], ialpha);
if (left) {
dst[span->len] = src + ALPHA_BLEND(dst[span->len], ialpha);
}
++span;
}
return true;
}
#endif