90 lines
3.3 KiB
C++
90 lines
3.3 KiB
C++
/*
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* Copyright 2017 Google Inc.
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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 SkAndroidFrameworkUtils_DEFINED
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#define SkAndroidFrameworkUtils_DEFINED
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#include "include/core/SkColor.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkTileMode.h"
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#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
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class SkCanvas;
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struct SkIRect;
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struct SkRect;
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class SkSurface;
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class SkShader;
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/**
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* SkAndroidFrameworkUtils expose private APIs used only by Android framework.
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*/
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class SkAndroidFrameworkUtils {
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public:
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#if defined(SK_GANESH)
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/**
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* clipWithStencil draws the current clip into a stencil buffer with reference value and mask
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* set to 0x1. This function works only on a GPU canvas.
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*
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* @param canvas A GPU canvas that has a non-empty clip.
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*
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* @return true on success or false if clip is empty or not a GPU canvas.
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*/
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static bool clipWithStencil(SkCanvas* canvas);
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#endif //defined(SK_GANESH)
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static void SafetyNetLog(const char*);
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static sk_sp<SkSurface> getSurfaceFromCanvas(SkCanvas* canvas);
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static int SaveBehind(SkCanvas* canvas, const SkRect* subset);
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// Operating within the canvas' clip stack, this resets the geometry of the clip to be wide
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// open modula any device clip restriction that was set outside of the clip stack.
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static void ResetClip(SkCanvas* canvas);
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/**
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* Unrolls a chain of nested SkPaintFilterCanvas to return the base wrapped canvas.
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*
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* @param canvas A SkPaintFilterCanvas or any other SkCanvas subclass.
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*
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* @return SkCanvas that was found in the innermost SkPaintFilterCanvas.
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*/
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static SkCanvas* getBaseWrappedCanvas(SkCanvas* canvas);
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/**
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* If the shader represents a linear gradient ShaderAsALinearGradient
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* returns true and if info is not null, ShaderAsALinearGradient populates
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* info with the parameters for the gradient. fColorCount is both an input
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* and output parameter. On input, it indicates how many entries in
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* fColors and fColorOffsets can be used, if they are not nullptr. After
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* asAGradient has run, fColorCount indicates how many color-offset pairs
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* there are in the gradient. fColorOffsets specifies where on the range of
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* 0 to 1 to transition to the given color. fPoints represent the endpoints
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* of the gradient.
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*/
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struct LinearGradientInfo {
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int fColorCount = 0; //!< In-out parameter, specifies passed size
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// of fColors/fColorOffsets on input, and
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// actual number of colors/offsets on
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// output.
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SkColor* fColors = nullptr; //!< The colors in the gradient.
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SkScalar* fColorOffsets = nullptr; //!< The unit offset for color transitions.
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SkPoint fPoints[2]; //!< Type specific, see above.
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SkTileMode fTileMode;
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uint32_t fGradientFlags = 0; //!< see SkGradientShader::Flags
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};
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static bool ShaderAsALinearGradient(SkShader* shader, LinearGradientInfo*);
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};
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#endif // SK_BUILD_FOR_ANDROID_ANDROID
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#endif // SkAndroidFrameworkUtils_DEFINED
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