SkBlendModePriv.h

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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.
 */
 
#ifndef SkBlendModePriv_DEFINED
#define SkBlendModePriv_DEFINED
 
#include "include/core/SkBlendMode.h"
#include "include/core/SkColor.h"
#include "include/private/SkColorData.h"
 
class SkRasterPipeline;
class SkPaint;
 
/**
 *  Sentinel value for SkBlendMode enum.
 *
 *  Will never be a valid enum value, but will be storable in a byte.
 */
constexpr uint8_t kCustom_SkBlendMode = 0xFF;
 
bool SkBlendMode_SupportsCoverageAsAlpha(SkBlendMode);
 
static inline bool SkBlendMode_CaresAboutRBOrder(SkBlendMode mode) {
    return (mode > SkBlendMode::kLastSeparableMode);
}
 
bool SkBlendMode_ShouldPreScaleCoverage(SkBlendMode, bool rgb_coverage);
void SkBlendMode_AppendStages(SkBlendMode, SkRasterPipeline*);
 
SkPMColor4f SkBlendMode_Apply(SkBlendMode, const SkPMColor4f& src, const SkPMColor4f& dst);
 
enum class SkBlendFastPath {
    kNormal,      // draw normally
    kSrcOver,     //< draw as if in srcover mode
    kSkipDrawing  //< draw nothing
};
 
/**
 *  Given a paint, determine whether the paint's blend mode can be
 *  replaced with kSrcOver or not drawn at all. This can inform drawing optimizations.
 */
SkBlendFastPath CheckFastPath(const SkPaint&, bool dstIsOpaque);
 
#endif