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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkSpriteBlitter.h"
#include "SkArenaAlloc.h"
#include "SkBlitRow.h"
#include "SkColorFilter.h"
#include "SkColorData.h"
#include "SkPaint.h"
#include "SkTemplates.h"
#include "SkUtils.h"
#include "SkXfermodePriv.h"
///////////////////////////////////////////////////////////////////////////////
static void S32_src(uint16_t dst[], const SkPMColor src[], int count) {
for (int i = 0; i < count; ++i) {
dst[i] = SkPixel32ToPixel16(src[i]);
}
}
static void S32_srcover(uint16_t dst[], const SkPMColor src[], int count) {
for (int i = 0; i < count; ++i) {
dst[i] = SkSrcOver32To16(src[i], dst[i]);
}
}
class Sprite_D16_S32 : public SkSpriteBlitter {
public:
Sprite_D16_S32(const SkPixmap& src, SkBlendMode mode) : INHERITED(src) {
SkASSERT(src.colorType() == kN32_SkColorType);
SkASSERT(mode == SkBlendMode::kSrc || mode == SkBlendMode::kSrcOver);
fUseSrcOver = (mode == SkBlendMode::kSrcOver) && !src.isOpaque();
}
void blitRect(int x, int y, int width, int height) override {
SkASSERT(width > 0 && height > 0);
uint16_t* SK_RESTRICT dst = fDst.writable_addr16(x, y);
const uint32_t* SK_RESTRICT src = fSource.addr32(x - fLeft, y - fTop);
size_t dstRB = fDst.rowBytes();
size_t srcRB = fSource.rowBytes();
do {
if (fUseSrcOver) {
S32_srcover(dst, src, width);
} else {
S32_src(dst, src, width);
}
dst = (uint16_t* SK_RESTRICT)((char*)dst + dstRB);
src = (const uint32_t* SK_RESTRICT)((const char*)src + srcRB);
} while (--height != 0);
}
private:
bool fUseSrcOver;
typedef SkSpriteBlitter INHERITED;
};
SkSpriteBlitter* SkSpriteBlitter::ChooseL565(const SkPixmap& source, const SkPaint& paint,
SkArenaAlloc* allocator) {
SkASSERT(allocator != nullptr);
if (paint.getColorFilter() != nullptr) {
return nullptr;
}
if (paint.getMaskFilter() != nullptr) {
return nullptr;
}
U8CPU alpha = paint.getAlpha();
if (alpha != 0xFF) {
return nullptr;
}
if (source.colorType() == kN32_SkColorType) {
switch (paint.getBlendMode()) {
case SkBlendMode::kSrc:
case SkBlendMode::kSrcOver:
return allocator->make<Sprite_D16_S32>(source, paint.getBlendMode());
default:
break;
}
}
return nullptr;
}
//////////////////////////////////////////////////////////////////////////////////////////////////
static unsigned div255(unsigned a, unsigned b) {
return (a * b * 257 + 127) >> 16;
}
static void S32_src_da8(uint8_t dst[], const SkPMColor src[], int count) {
for (int i = 0; i < count; ++i) {
dst[i] = SkGetPackedA32(src[i]);
}
}
static void S32_srcover_da8(uint8_t dst[], const SkPMColor src[], int count) {
for (int i = 0; i < count; ++i) {
SkPMColor c = src[i];
if (c) {
unsigned a = SkGetPackedA32(c);
if (a == 0xFF) {
dst[i] = 0xFF;
} else {
dst[i] = a + div255(255 - a, dst[i]);
}
}
}
}
class Sprite_D8_S32 : public SkSpriteBlitter {
public:
Sprite_D8_S32(const SkPixmap& src, SkBlendMode mode) : INHERITED(src) {
SkASSERT(src.colorType() == kN32_SkColorType);
SkASSERT(mode == SkBlendMode::kSrc || mode == SkBlendMode::kSrcOver);
fUseSrcOver = (mode == SkBlendMode::kSrcOver) && !src.isOpaque();
}
void blitRect(int x, int y, int width, int height) override {
SkASSERT(width > 0 && height > 0);
uint8_t* SK_RESTRICT dst = fDst.writable_addr8(x, y);
const uint32_t* SK_RESTRICT src = fSource.addr32(x - fLeft, y - fTop);
size_t dstRB = fDst.rowBytes();
size_t srcRB = fSource.rowBytes();
do {
if (fUseSrcOver) {
S32_srcover_da8(dst, src, width);
} else {
S32_src_da8(dst, src, width);
}
dst = (uint8_t* SK_RESTRICT)((char*)dst + dstRB);
src = (const uint32_t* SK_RESTRICT)((const char*)src + srcRB);
} while (--height != 0);
}
private:
bool fUseSrcOver;
typedef SkSpriteBlitter INHERITED;
};
SkSpriteBlitter* SkSpriteBlitter::ChooseLA8(const SkPixmap& source, const SkPaint& paint,
SkArenaAlloc* allocator) {
SkASSERT(allocator != nullptr);
if (paint.getColorFilter() != nullptr) {
return nullptr;
}
if (paint.getMaskFilter() != nullptr) {
return nullptr;
}
U8CPU alpha = paint.getAlpha();
if (alpha != 0xFF) {
return nullptr;
}
if (source.colorType() == kN32_SkColorType) {
switch (paint.getBlendMode()) {
case SkBlendMode::kSrc:
case SkBlendMode::kSrcOver:
return allocator->make<Sprite_D8_S32>(source, paint.getBlendMode());
default:
break;
}
}
return nullptr;
}
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