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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
SkBlitRow::ColorRectProc PlatformColorRectProcFactory();
static void S32_Opaque_BlitRow32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src,
int count, U8CPU alpha) {
SkASSERT(255 == alpha);
memcpy(dst, src, count * sizeof(SkPMColor));
}
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
}
}
//#define TEST_SRC_ALPHA
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 {
#ifdef TEST_SRC_ALPHA
SkPMColor sc = *src;
if (sc) {
unsigned srcA = SkGetPackedA32(sc);
SkPMColor result = sc;
if (srcA != 255) {
result = SkPMSrcOver(sc, *dst);
}
*dst = result;
}
#else
*dst = SkPMSrcOver(*src, *dst);
#endif
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;
}
void SkBlitRow::Color32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src,
int count, SkPMColor color) {
if (count > 0) {
if (0 == color) {
if (src != dst) {
memcpy(dst, src, count * sizeof(SkPMColor));
}
return;
}
unsigned colorA = SkGetPackedA32(color);
if (255 == colorA) {
sk_memset32(dst, color, count);
} else {
unsigned scale = 256 - SkAlpha255To256(colorA);
do {
*dst = color + SkAlphaMulQ(*src, scale);
src += 1;
dst += 1;
} while (--count);
}
}
}
void SkBlitRow::ColorRect32(SkPMColor* dst, int width, int height,
size_t rowBytes, SkPMColor color) {
SkBlitRow::ColorProc proc = SkBlitRow::ColorProcFactory();
while (--height >= 0) {
(*proc)(dst, dst, width, color);
dst = (SkPMColor*) ((char*)dst + rowBytes);
}
}
SkBlitRow::ColorRectProc SkBlitRow::ColorRectProcFactory() {
SkBlitRow::ColorRectProc proc = PlatformColorRectProcFactory();
if (NULL == proc) {
proc = ColorRect32;
}
SkASSERT(proc);
return proc;
}
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