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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBlitter.h"
#include "SkColor.h"
#include "SkColorFilter.h"
#include "SkOpts.h"
#include "SkPM4f.h"
#include "SkRasterPipeline.h"
#include "SkShader.h"
#include "SkXfermode.h"
class SkRasterPipelineBlitter : public SkBlitter {
public:
static SkBlitter* Create(const SkPixmap&, const SkPaint&, SkTBlitterAllocator*);
SkRasterPipelineBlitter(SkPixmap dst,
SkRasterPipeline shader,
SkRasterPipeline colorFilter,
SkRasterPipeline xfermode,
SkPM4f paintColor)
: fDst(dst)
, fShader(shader)
, fColorFilter(colorFilter)
, fXfermode(xfermode)
, fPaintColor(paintColor)
{}
void blitH (int x, int y, int w) override;
void blitAntiH(int x, int y, const SkAlpha[], const int16_t[]) override;
void blitMask (const SkMask&, const SkIRect& clip) override;
// TODO: The default implementations of the other blits look fine,
// but some of them like blitV could probably benefit from custom
// blits using something like a SkRasterPipeline::runFew() method.
private:
void append_load_d(SkRasterPipeline*, const void*) const;
void append_store (SkRasterPipeline*, void*) const;
SkPixmap fDst;
SkRasterPipeline fShader, fColorFilter, fXfermode;
SkPM4f fPaintColor;
typedef SkBlitter INHERITED;
};
SkBlitter* SkCreateRasterPipelineBlitter(const SkPixmap& dst,
const SkPaint& paint,
SkTBlitterAllocator* alloc) {
return SkRasterPipelineBlitter::Create(dst, paint, alloc);
}
static bool supported(const SkImageInfo& info) {
switch (info.colorType()) {
case kN32_SkColorType: return info.gammaCloseToSRGB();
case kRGBA_F16_SkColorType: return true;
case kRGB_565_SkColorType: return true;
default: return false;
}
}
template <typename Effect>
static bool append_effect_stages(const Effect* effect, SkRasterPipeline* pipeline) {
return !effect || effect->appendStages(pipeline);
}
SkBlitter* SkRasterPipelineBlitter::Create(const SkPixmap& dst,
const SkPaint& paint,
SkTBlitterAllocator* alloc) {
if (!supported(dst.info())) {
return nullptr;
}
if (paint.getShader()) {
return nullptr; // TODO: need to work out how shaders and their contexts work
}
SkRasterPipeline shader, colorFilter, xfermode;
if (!append_effect_stages(paint.getColorFilter(), &colorFilter) ||
!append_effect_stages(SkXfermode::Peek(paint.getBlendMode()), &xfermode )) {
return nullptr;
}
uint32_t paintColor = paint.getColor();
SkColor4f color;
if (SkImageInfoIsGammaCorrect(dst.info())) {
color = SkColor4f::FromColor(paintColor);
} else {
swizzle_rb(SkNx_cast<float>(Sk4b::Load(&paintColor)) * (1/255.0f)).store(&color);
}
auto blitter = alloc->createT<SkRasterPipelineBlitter>(
dst,
shader, colorFilter, xfermode,
color.premul());
if (!paint.getShader()) {
blitter->fShader.append(SkRasterPipeline::constant_color, &blitter->fPaintColor);
}
if (paint.isSrcOver()) {
blitter->fXfermode.append(SkRasterPipeline::srcover);
}
return blitter;
}
void SkRasterPipelineBlitter::append_load_d(SkRasterPipeline* p, const void* dst) const {
SkASSERT(supported(fDst.info()));
switch (fDst.info().colorType()) {
case kN32_SkColorType:
if (fDst.info().gammaCloseToSRGB()) {
p->append(SkRasterPipeline::load_d_srgb, dst);
}
break;
case kRGBA_F16_SkColorType:
p->append(SkRasterPipeline::load_d_f16, dst);
break;
case kRGB_565_SkColorType:
p->append(SkRasterPipeline::load_d_565, dst);
break;
default: break;
}
}
void SkRasterPipelineBlitter::append_store(SkRasterPipeline* p, void* dst) const {
SkASSERT(supported(fDst.info()));
switch (fDst.info().colorType()) {
case kN32_SkColorType:
if (fDst.info().gammaCloseToSRGB()) {
p->append(SkRasterPipeline::store_srgb, dst);
}
break;
case kRGBA_F16_SkColorType:
p->append(SkRasterPipeline::store_f16, dst);
break;
case kRGB_565_SkColorType:
p->append(SkRasterPipeline::store_565, dst);
break;
default: break;
}
}
void SkRasterPipelineBlitter::blitH(int x, int y, int w) {
auto dst = fDst.writable_addr(0,y);
SkRasterPipeline p;
p.extend(fShader);
p.extend(fColorFilter);
this->append_load_d(&p, dst);
p.extend(fXfermode);
this->append_store(&p, dst);
p.run(x, w);
}
void SkRasterPipelineBlitter::blitAntiH(int x, int y, const SkAlpha aa[], const int16_t runs[]) {
auto dst = fDst.writable_addr(0,y);
float coverage;
SkRasterPipeline p;
p.extend(fShader);
p.extend(fColorFilter);
this->append_load_d(&p, dst);
p.extend(fXfermode);
p.append(SkRasterPipeline::lerp_constant_float, &coverage);
this->append_store(&p, dst);
for (int16_t run = *runs; run > 0; run = *runs) {
coverage = *aa * (1/255.0f);
p.run(x, run);
x += run;
runs += run;
aa += run;
}
}
void SkRasterPipelineBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {
if (mask.fFormat == SkMask::kBW_Format) {
// TODO: native BW masks?
return INHERITED::blitMask(mask, clip);
}
int x = clip.left();
for (int y = clip.top(); y < clip.bottom(); y++) {
auto dst = fDst.writable_addr(0,y);
SkRasterPipeline p;
p.extend(fShader);
p.extend(fColorFilter);
this->append_load_d(&p, dst);
p.extend(fXfermode);
switch (mask.fFormat) {
case SkMask::kA8_Format:
p.append(SkRasterPipeline::lerp_u8, mask.getAddr8(x,y)-x);
break;
case SkMask::kLCD16_Format:
p.append(SkRasterPipeline::lerp_565, mask.getAddrLCD16(x,y)-x);
break;
default: break;
}
this->append_store(&p, dst);
p.run(x, clip.width());
}
}
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