| /* |
| * 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. |
| */ |
| |
| #ifndef SkLayerRasterizer_DEFINED |
| #define SkLayerRasterizer_DEFINED |
| |
| #include "SkRasterizer.h" |
| #include "SkDeque.h" |
| #include "SkScalar.h" |
| |
| class SkPaint; |
| |
| class SK_API SkLayerRasterizer : public SkRasterizer { |
| public: |
| virtual ~SkLayerRasterizer(); |
| |
| class SK_API Builder { |
| public: |
| Builder(); |
| ~Builder(); |
| |
| void addLayer(const SkPaint& paint) { |
| this->addLayer(paint, 0, 0); |
| } |
| |
| /** |
| * Add a new layer (above any previous layers) to the rasterizer. |
| * The layer will extract those fields that affect the mask from |
| * the specified paint, but will not retain a reference to the paint |
| * object itself, so it may be reused without danger of side-effects. |
| */ |
| void addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy); |
| |
| /** |
| * Pass queue of layers on to newly created layer rasterizer and return it. The builder |
| * *cannot* be used any more after calling this function. If no layers have been added, |
| * returns NULL. |
| * |
| * The caller is responsible for calling unref() on the returned object, if non NULL. |
| */ |
| sk_sp<SkLayerRasterizer> detach(); |
| |
| /** |
| * Create and return a new immutable SkLayerRasterizer that contains a shapshot of the |
| * layers that were added to the Builder, without modifying the Builder. The Builder |
| * *may* be used after calling this function. It will continue to hold any layers |
| * previously added, so consecutive calls to this function will return identical objects, |
| * and objects returned by future calls to this function contain all the layers in |
| * previously returned objects. If no layers have been added, returns NULL. |
| * |
| * Future calls to addLayer will not affect rasterizers previously returned by this call. |
| * |
| * The caller is responsible for calling unref() on the returned object, if non NULL. |
| */ |
| sk_sp<SkLayerRasterizer> snapshot() const; |
| |
| private: |
| SkDeque* fLayers; |
| }; |
| |
| SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLayerRasterizer) |
| |
| protected: |
| SkLayerRasterizer(); |
| SkLayerRasterizer(SkDeque* layers); |
| void flatten(SkWriteBuffer&) const override; |
| |
| // override from SkRasterizer |
| virtual bool onRasterize(const SkPath& path, const SkMatrix& matrix, |
| const SkIRect* clipBounds, |
| SkMask* mask, SkMask::CreateMode mode) const override; |
| |
| private: |
| const SkDeque* const fLayers; |
| |
| static SkDeque* ReadLayers(SkReadBuffer& buffer); |
| |
| friend class LayerRasterizerTester; |
| |
| typedef SkRasterizer INHERITED; |
| }; |
| |
| #endif |