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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBlendModePriv.h"
#include "SkColorData.h"
#include "SkMathPriv.h"
#include "SkOnce.h"
#include "SkOpts.h"
#include "SkPM4f.h"
#include "SkRasterPipeline.h"
#include "SkReadBuffer.h"
#include "SkString.h"
#include "SkWriteBuffer.h"
#include "SkXfermodePriv.h"
#include "../jumper/SkJumper.h"
#if SK_SUPPORT_GPU
#include "GrFragmentProcessor.h"
#include "effects/GrCustomXfermode.h"
#include "effects/GrPorterDuffXferProcessor.h"
#include "effects/GrXfermodeFragmentProcessor.h"
#endif
///////////////////////////////////////////////////////////////////////////////////////////////////
class SkProcCoeffXfermode : public SkXfermode {
public:
SkProcCoeffXfermode(SkBlendMode mode) : fMode(mode) {}
void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
const SkAlpha aa[]) const override {
SkASSERT(dst && src && count >= 0);
SkRasterPipeline_<256> p;
SkJumper_MemoryCtx dst_ctx = { (void*)dst, 0 },
src_ctx = { (void*)src, 0 },
aa_ctx = { (void*)aa, 0 };
if (kN32_SkColorType == kBGRA_8888_SkColorType) {
p.append(SkRasterPipeline::load_bgra_dst, &dst_ctx);
p.append(SkRasterPipeline::load_bgra , &src_ctx);
} else {
p.append(SkRasterPipeline::load_8888_dst, &dst_ctx);
p.append(SkRasterPipeline::load_8888, &src_ctx);
}
if (SkBlendMode_ShouldPreScaleCoverage(fMode, /*rgb_coverage=*/false)) {
if (aa) {
p.append(SkRasterPipeline::scale_u8, &aa_ctx);
}
SkBlendMode_AppendStages(fMode, &p);
} else {
SkBlendMode_AppendStages(fMode, &p);
if (aa) {
p.append(SkRasterPipeline::lerp_u8, &aa_ctx);
}
}
if (kN32_SkColorType == kBGRA_8888_SkColorType) {
p.append(SkRasterPipeline::store_bgra, &dst_ctx);
} else {
p.append(SkRasterPipeline::store_8888, &dst_ctx);
}
p.run(0, 0, count,1);
}
private:
const SkBlendMode fMode;
typedef SkXfermode INHERITED;
};
const char* SkBlendMode_Name(SkBlendMode mode) {
SkASSERT((unsigned) mode <= (unsigned)SkBlendMode::kLastMode);
const char* gModeStrings[] = {
"Clear", "Src", "Dst", "SrcOver", "DstOver", "SrcIn", "DstIn",
"SrcOut", "DstOut", "SrcATop", "DstATop", "Xor", "Plus",
"Modulate", "Screen", "Overlay", "Darken", "Lighten", "ColorDodge",
"ColorBurn", "HardLight", "SoftLight", "Difference", "Exclusion",
"Multiply", "Hue", "Saturation", "Color", "Luminosity"
};
return gModeStrings[(int)mode];
static_assert(SK_ARRAY_COUNT(gModeStrings) == (size_t)SkBlendMode::kLastMode + 1, "mode_count");
}
sk_sp<SkXfermode> SkXfermode::Make(SkBlendMode mode) {
if ((unsigned)mode > (unsigned)SkBlendMode::kLastMode) {
// report error
return nullptr;
}
// Skia's "default" mode is srcover. nullptr in SkPaint is interpreted as srcover
// so we can just return nullptr from the factory.
if (SkBlendMode::kSrcOver == mode) {
return nullptr;
}
const int COUNT_BLENDMODES = (int)SkBlendMode::kLastMode + 1;
static SkOnce once[COUNT_BLENDMODES];
static SkXfermode* cached[COUNT_BLENDMODES];
once[(int)mode]([mode] {
if (auto xfermode = SkOpts::create_xfermode(mode)) {
cached[(int)mode] = xfermode;
} else {
cached[(int)mode] = new SkProcCoeffXfermode(mode);
}
});
return sk_ref_sp(cached[(int)mode]);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
bool SkXfermode::IsOpaque(SkBlendMode mode, SrcColorOpacity opacityType) {
SkBlendModeCoeff src, dst;
if (!SkBlendMode_AsCoeff(mode, &src, &dst)) {
return false;
}
switch (src) {
case SkBlendModeCoeff::kDA:
case SkBlendModeCoeff::kDC:
case SkBlendModeCoeff::kIDA:
case SkBlendModeCoeff::kIDC:
return false;
default:
break;
}
switch (dst) {
case SkBlendModeCoeff::kZero:
return true;
case SkBlendModeCoeff::kISA:
return kOpaque_SrcColorOpacity == opacityType;
case SkBlendModeCoeff::kSA:
return kTransparentBlack_SrcColorOpacity == opacityType ||
kTransparentAlpha_SrcColorOpacity == opacityType;
case SkBlendModeCoeff::kSC:
return kTransparentBlack_SrcColorOpacity == opacityType;
default:
return false;
}
return false;
}
#if SK_SUPPORT_GPU
const GrXPFactory* SkBlendMode_AsXPFactory(SkBlendMode mode) {
if (SkBlendMode_AsCoeff(mode, nullptr, nullptr)) {
const GrXPFactory* result = GrPorterDuffXPFactory::Get(mode);
SkASSERT(result);
return result;
}
SkASSERT(GrCustomXfermode::IsSupportedMode(mode));
return GrCustomXfermode::Get(mode);
}
#endif
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