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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBlitRow.h"
#include "SkBlitMask.h"
#include "SkColorPriv.h"
#include "SkUtils.h"
#define UNROLL
static void S32_Opaque_BlitRow32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src,
int count, U8CPU alpha) {
SkASSERT(255 == alpha);
sk_memcpy32(dst, src, count);
}
static void S32_Blend_BlitRow32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src,
int count, U8CPU alpha) {
SkASSERT(alpha <= 255);
if (count > 0) {
unsigned src_scale = SkAlpha255To256(alpha);
unsigned dst_scale = 256 - src_scale;
#ifdef UNROLL
if (count & 1) {
*dst = SkAlphaMulQ(*(src++), src_scale) + SkAlphaMulQ(*dst, dst_scale);
dst += 1;
count -= 1;
}
const SkPMColor* SK_RESTRICT srcEnd = src + count;
while (src != srcEnd) {
*dst = SkAlphaMulQ(*(src++), src_scale) + SkAlphaMulQ(*dst, dst_scale);
dst += 1;
*dst = SkAlphaMulQ(*(src++), src_scale) + SkAlphaMulQ(*dst, dst_scale);
dst += 1;
}
#else
do {
*dst = SkAlphaMulQ(*src, src_scale) + SkAlphaMulQ(*dst, dst_scale);
src += 1;
dst += 1;
} while (--count > 0);
#endif
}
}
static void S32A_Opaque_BlitRow32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src,
int count, U8CPU alpha) {
SkASSERT(255 == alpha);
if (count > 0) {
#ifdef UNROLL
if (count & 1) {
*dst = SkPMSrcOver(*(src++), *dst);
dst += 1;
count -= 1;
}
const SkPMColor* SK_RESTRICT srcEnd = src + count;
while (src != srcEnd) {
*dst = SkPMSrcOver(*(src++), *dst);
dst += 1;
*dst = SkPMSrcOver(*(src++), *dst);
dst += 1;
}
#else
do {
*dst = SkPMSrcOver(*src, *dst);
src += 1;
dst += 1;
} while (--count > 0);
#endif
}
}
static void S32A_Blend_BlitRow32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src,
int count, U8CPU alpha) {
SkASSERT(alpha <= 255);
if (count > 0) {
#ifdef UNROLL
if (count & 1) {
*dst = SkBlendARGB32(*(src++), *dst, alpha);
dst += 1;
count -= 1;
}
const SkPMColor* SK_RESTRICT srcEnd = src + count;
while (src != srcEnd) {
*dst = SkBlendARGB32(*(src++), *dst, alpha);
dst += 1;
*dst = SkBlendARGB32(*(src++), *dst, alpha);
dst += 1;
}
#else
do {
*dst = SkBlendARGB32(*src, *dst, alpha);
src += 1;
dst += 1;
} while (--count > 0);
#endif
}
}
///////////////////////////////////////////////////////////////////////////////
static const SkBlitRow::Proc32 gDefault_Procs32[] = {
S32_Opaque_BlitRow32,
S32_Blend_BlitRow32,
S32A_Opaque_BlitRow32,
S32A_Blend_BlitRow32
};
SkBlitRow::Proc32 SkBlitRow::Factory32(unsigned flags) {
SkASSERT(flags < SK_ARRAY_COUNT(gDefault_Procs32));
// just so we don't crash
flags &= kFlags32_Mask;
SkBlitRow::Proc32 proc = PlatformProcs32(flags);
if (NULL == proc) {
proc = gDefault_Procs32[flags];
}
SkASSERT(proc);
return proc;
}
SkBlitRow::Proc32 SkBlitRow::ColorProcFactory() {
SkBlitRow::ColorProc proc = PlatformColorProc();
if (NULL == proc) {
proc = Color32;
}
SkASSERT(proc);
return proc;
}
#define SK_SUPPORT_LEGACY_COLOR32_MATHx
// Color32 and its SIMD specializations use the blend_256_round_alt algorithm
// from tests/BlendTest.cpp. It's not quite perfect, but it's never wrong in the
// interesting edge cases, and it's quite a bit faster than blend_perfect.
//
// blend_256_round_alt is our currently blessed algorithm. Please use it or an analogous one.
void SkBlitRow::Color32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src,
int count, SkPMColor color) {
switch (SkGetPackedA32(color)) {
case 0: memmove(dst, src, count * sizeof(SkPMColor)); return;
case 255: sk_memset32(dst, color, count); return;
}
unsigned invA = 255 - SkGetPackedA32(color);
#ifdef SK_SUPPORT_LEGACY_COLOR32_MATH // blend_256_plus1_trunc, busted
unsigned round = 0;
#else // blend_256_round_alt, good
invA += invA >> 7;
unsigned round = (128 << 16) + (128 << 0);
#endif
while (count --> 0) {
// Our math is 16-bit, so we can do a little bit of SIMD in 32-bit registers.
const uint32_t mask = 0x00FF00FF;
uint32_t rb = (((*src >> 0) & mask) * invA + round) >> 8, // _r_b
ag = (((*src >> 8) & mask) * invA + round) >> 0; // a_g_
*dst = color + ((rb & mask) | (ag & ~mask));
src++;
dst++;
}
}
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