mirror of https://github.com/axmolengine/axmol.git
111 lines
3.7 KiB
C
111 lines
3.7 KiB
C
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/*
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* Copyright (C) 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SkPDFShader_DEFINED
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#define SkPDFShader_DEFINED
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#include "SkPDFStream.h"
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#include "SkPDFTypes.h"
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#include "SkMatrix.h"
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#include "SkRefCnt.h"
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#include "SkShader.h"
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class SkObjRef;
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class SkPDFCatalog;
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/** \class SkPDFShader
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In PDF parlance, this is a pattern, used in place of a color when the
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pattern color space is selected.
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*/
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class SkPDFShader : public SkPDFObject {
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public:
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virtual ~SkPDFShader();
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// The SkPDFObject interface.
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virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
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bool indirect);
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virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);
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virtual void getResources(SkTDArray<SkPDFObject*>* resourceList);
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/** Get the PDF shader for the passed SkShader. If the SkShader is
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* invalid in some way, returns NULL. The reference count of
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* the object is incremented and it is the caller's responsibility to
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* unreference it when done. This is needed to accommodate the weak
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* reference pattern used when the returned object is new and has no
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* other references.
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* @param shader The SkShader to emulate.
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* @param matrix The current transform. (PDF shaders are absolutely
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* positioned, relative to where the page is drawn.)
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* @param surfceBBox The bounding box of the drawing surface (with matrix
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* already applied).
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*/
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static SkPDFShader* getPDFShader(const SkShader& shader,
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const SkMatrix& matrix,
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const SkIRect& surfaceBBox);
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private:
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class State {
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public:
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SkShader::GradientType fType;
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SkShader::GradientInfo fInfo;
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SkAutoFree fColorData;
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SkMatrix fCanvasTransform;
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SkMatrix fShaderTransform;
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SkIRect fBBox;
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SkBitmap fImage;
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uint32_t fPixelGeneration;
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SkShader::TileMode fImageTileModes[2];
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explicit State(const SkShader& shader, const SkMatrix& canvasTransform,
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const SkIRect& bbox);
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bool operator==(const State& b) const;
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};
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SkRefPtr<SkPDFDict> fContent;
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SkTDArray<SkPDFObject*> fResources;
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SkAutoTDelete<const State> fState;
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class ShaderCanonicalEntry {
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public:
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SkPDFShader* fPDFShader;
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const State* fState;
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bool operator==(const ShaderCanonicalEntry& b) const {
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return fPDFShader == b.fPDFShader || *fState == *b.fState;
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}
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ShaderCanonicalEntry(SkPDFShader* pdfShader, const State* state)
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: fPDFShader(pdfShader),
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fState(state) {
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}
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};
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// This should be made a hash table if performance is a problem.
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static SkTDArray<ShaderCanonicalEntry>& canonicalShaders();
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static SkMutex& canonicalShadersMutex();
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static SkPDFObject* rangeObject();
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SkPDFShader(State* state);
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void doFunctionShader();
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void doImageShader();
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SkPDFStream* makePSFunction(const SkString& psCode, SkPDFArray* domain);
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};
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#endif
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