09d9435835
BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4209 Change-Id: I49ae36a9b2bb51a6470638d3264923ff4a4dea0a Reviewed-on: https://skia-review.googlesource.com/4209 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Mike Reed <reed@google.com>
88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkLayerRasterizer_DEFINED
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#define SkLayerRasterizer_DEFINED
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#include "SkRasterizer.h"
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#include "SkDeque.h"
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#include "SkScalar.h"
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class SkPaint;
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class SK_API SkLayerRasterizer : public SkRasterizer {
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public:
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virtual ~SkLayerRasterizer();
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class SK_API Builder {
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public:
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Builder();
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~Builder();
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void addLayer(const SkPaint& paint) {
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this->addLayer(paint, 0, 0);
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}
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/**
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* Add a new layer (above any previous layers) to the rasterizer.
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* The layer will extract those fields that affect the mask from
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* the specified paint, but will not retain a reference to the paint
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* object itself, so it may be reused without danger of side-effects.
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*/
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void addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy);
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/**
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* Pass queue of layers on to newly created layer rasterizer and return it. The builder
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* *cannot* be used any more after calling this function. If no layers have been added,
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* returns NULL.
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*
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* The caller is responsible for calling unref() on the returned object, if non NULL.
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*/
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sk_sp<SkLayerRasterizer> detach();
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/**
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* Create and return a new immutable SkLayerRasterizer that contains a shapshot of the
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* layers that were added to the Builder, without modifying the Builder. The Builder
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* *may* be used after calling this function. It will continue to hold any layers
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* previously added, so consecutive calls to this function will return identical objects,
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* and objects returned by future calls to this function contain all the layers in
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* previously returned objects. If no layers have been added, returns NULL.
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*
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* Future calls to addLayer will not affect rasterizers previously returned by this call.
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*
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* The caller is responsible for calling unref() on the returned object, if non NULL.
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*/
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sk_sp<SkLayerRasterizer> snapshot() const;
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private:
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SkDeque* fLayers;
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};
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SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLayerRasterizer)
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protected:
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SkLayerRasterizer();
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SkLayerRasterizer(SkDeque* layers);
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void flatten(SkWriteBuffer&) const override;
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// override from SkRasterizer
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virtual bool onRasterize(const SkPath& path, const SkMatrix& matrix,
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const SkIRect* clipBounds,
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SkMask* mask, SkMask::CreateMode mode) const override;
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private:
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const SkDeque* const fLayers;
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static SkDeque* ReadLayers(SkReadBuffer& buffer);
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friend class LayerRasterizerTester;
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typedef SkRasterizer INHERITED;
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};
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#endif
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