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Add WebPReplaceTransparentPixels() in dsp

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with SSE2 implementation.

(Extracted from side experiment)

Change-Id: I62d457fb6643645291cffd6d2d205d4a5ffa4517
This commit is contained in:
Skal
2020-09-05 11:44:59 +02:00
parent 84739717d6
commit 55a080e50a
6 changed files with 49 additions and 22 deletions
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8
src/dsp/alpha_processing.c
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@ -359,6 +359,11 @@ static int HasAlpha32b_C(const uint8_t* src, int length) {
return 0;
}
static void AlphaReplace_C(uint32_t* src, int length, uint32_t color) {
int x;
for (x = 0; x < length; ++x) if ((src[x] >> 24) == 0) src[x] = color;
}
//------------------------------------------------------------------------------
// Simple channel manipulations.
@ -400,6 +405,7 @@ void (*WebPPackRGB)(const uint8_t* r, const uint8_t* g, const uint8_t* b,
int (*WebPHasAlpha8b)(const uint8_t* src, int length);
int (*WebPHasAlpha32b)(const uint8_t* src, int length);
void (*WebPAlphaReplace)(uint32_t* src, int length, uint32_t color);
//------------------------------------------------------------------------------
// Init function
@ -428,6 +434,7 @@ WEBP_DSP_INIT_FUNC(WebPInitAlphaProcessing) {
WebPHasAlpha8b = HasAlpha8b_C;
WebPHasAlpha32b = HasAlpha32b_C;
WebPAlphaReplace = AlphaReplace_C;
// If defined, use CPUInfo() to overwrite some pointers with faster versions.
if (VP8GetCPUInfo != NULL) {
@ -469,4 +476,5 @@ WEBP_DSP_INIT_FUNC(WebPInitAlphaProcessing) {
assert(WebPPackRGB != NULL);
assert(WebPHasAlpha8b != NULL);
assert(WebPHasAlpha32b != NULL);
assert(WebPAlphaReplace != NULL);
}

22
src/dsp/alpha_processing_sse2.c
View File

@ -265,6 +265,27 @@ static int HasAlpha32b_SSE2(const uint8_t* src, int length) {
return 0;
}
static void AlphaReplace_SSE2(uint32_t* src, int length, uint32_t color) {
const __m128i m_color = _mm_set1_epi32(color);
const __m128i zero = _mm_setzero_si128();
int i = 0;
for (; i + 8 <= length; i += 8) {
const __m128i a0 = _mm_loadu_si128((const __m128i*)(src + i + 0));
const __m128i a1 = _mm_loadu_si128((const __m128i*)(src + i + 4));
const __m128i b0 = _mm_srai_epi32(a0, 24);
const __m128i b1 = _mm_srai_epi32(a1, 24);
const __m128i c0 = _mm_cmpeq_epi32(b0, zero);
const __m128i c1 = _mm_cmpeq_epi32(b1, zero);
const __m128i d0 = _mm_and_si128(c0, m_color);
const __m128i d1 = _mm_and_si128(c1, m_color);
const __m128i e0 = _mm_andnot_si128(c0, a0);
const __m128i e1 = _mm_andnot_si128(c1, a1);
_mm_storeu_si128((__m128i*)(src + i + 0), _mm_or_si128(d0, e0));
_mm_storeu_si128((__m128i*)(src + i + 4), _mm_or_si128(d1, e1));
}
for (; i < length; ++i) if ((src[i] >> 24) == 0) src[i] = color;
}
// -----------------------------------------------------------------------------
// Apply alpha value to rows
@ -334,6 +355,7 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingSSE2(void) {
WebPHasAlpha8b = HasAlpha8b_SSE2;
WebPHasAlpha32b = HasAlpha32b_SSE2;
WebPAlphaReplace = AlphaReplace_SSE2;
}
#else // !WEBP_USE_SSE2

2
src/dsp/dsp.h
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@ -638,6 +638,8 @@ extern void (*WebPPackRGB)(const uint8_t* r, const uint8_t* g, const uint8_t* b,
extern int (*WebPHasAlpha8b)(const uint8_t* src, int length);
// This function returns true if src[4*i] contains a value different from 0xff.
extern int (*WebPHasAlpha32b)(const uint8_t* src, int length);
// replaces transparent values in src[] by 'color'.
extern void (*WebPAlphaReplace)(uint32_t* src, int length, uint32_t color);
// To be called first before using the above.
void WebPInitAlphaProcessing(void);