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Add methods to SkBlenderBase to identify SkBlendMode-based blends.

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Change-Id: Ia0ef90dd62b15f679791be6b9d14ed24a59ea8af
Bug: skia:12080
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/420821
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Mike Reed <reed@google.com>
This commit is contained in:
John Stiles 2021-06-24 15:23:32 -04:00 committed by Skia Commit-Bot
parent 28bea445a5
commit 65f65465eb
2 changed files with 48 additions and 5 deletions
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2
src/core/SkBlendModeBlender.h
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@ -14,7 +14,7 @@ class SkBlendModeBlender : public SkBlenderBase {
public:
SkBlendModeBlender(SkBlendMode mode) : fMode(mode) {}
bool asBlendMode(SkBlendMode* mode) const {
bool asBlendMode(SkBlendMode* mode) const final {
*mode = fMode;
return true;
}

51
src/core/SkBlenderBase.h
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@ -18,11 +18,54 @@ class GrFragmentProcessor;
class SkRuntimeEffect;
/**
* Encapsulates a custom blend function for Runtime Effects. These combine a source color (the
* result of our paint) and destination color (from the canvas) into a final color.
* Encapsulates a blend function, including non-public APIs.
* Blends combine a source color (the result of our paint) and destination color (from the canvas)
* into a final color.
*/
class SkBlenderBase : public SkBlender {
public:
public:
/** Returns true if this SkBlender represents any SkBlendMode. */
bool isBlendMode() const {
SkBlendMode mode;
return this->asBlendMode(&mode);
}
/** Returns true if this SkBlender does NOT represent any SkBlendMode. */
bool isCustomBlend() const {
return !this->isBlendMode();
}
/** Returns true if this SkBlender matches the passed-in SkBlendMode. */
bool isBlendMode(SkBlendMode expected) const {
SkBlendMode mode;
return this->asBlendMode(&mode) && (mode == expected);
}
/** Returns true if this SkBlender represents any coefficient-based SkBlendMode. */
bool isCoefficient() const {
return this->asCoefficient(/*src=*/nullptr, /*dst=*/nullptr);
}
/**
* For a SkBlendMode-based Porter-Duff blend, retrieves its coefficients into `src` and `dst`
* and returns true. Returns false for other types of blends.
*/
bool asCoefficient(SkBlendModeCoeff* src, SkBlendModeCoeff* dst) const {
SkBlendMode mode;
return this->asBlendMode(&mode) && SkBlendMode_AsCoeff(mode, src, dst);
}
/**
* Returns true if this SkBlender represents any SkBlendMode, and returns the blender's
* SkBlendMode in `mode`. Returns false for other types of blends.
*/
virtual bool asBlendMode(SkBlendMode* mode) const {
(void)mode;
return false;
}
/** Creates the blend program in SkVM. */
SK_WARN_UNUSED_RESULT
skvm::Color program(skvm::Builder* p, skvm::Color src, skvm::Color dst,
const SkColorInfo& colorInfo, skvm::Uniforms* uniforms,
@ -32,8 +75,8 @@ public:
#if SK_SUPPORT_GPU
/**
* Returns a GrFragmentProcessor that implements this blend for the GPU backend.
* The GrFragmentProcessor expects a premultiplied input and returns a premultiplied output.
* Returns a GrFragmentProcessor that implements this blend for the GPU backend.
* The GrFragmentProcessor expects a premultiplied input and returns a premultiplied output.
*/
virtual std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(
std::unique_ptr<GrFragmentProcessor> inputFP, const GrFPArgs& fpArgs) const = 0;