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