ComposeShaderAlphaGM Class Reference

Inheritance diagram for ComposeShaderAlphaGM:

Public Member Functions
	ComposeShaderAlphaGM ()
Public Member Functions inherited from skiagm::GM
	GM (SkColor backgroundColor=SK_ColorWHITE)
virtual	~GM ()
void	setMode (Mode mode)
Mode	getMode () const
DrawResult	gpuSetup (SkCanvas *, SkString *errorMsg, GraphiteTestContext *=nullptr)
void	gpuTeardown ()
void	onceBeforeDraw ()
DrawResult	draw (SkCanvas *canvas)
DrawResult	draw (SkCanvas *, SkString *errorMsg)
void	drawBackground (SkCanvas *)
DrawResult	drawContent (SkCanvas *canvas)
DrawResult	drawContent (SkCanvas *, SkString *errorMsg)
virtual bool	runAsBench () const
SkScalar	width ()
SkScalar	height ()
SkColor	getBGColor () const
void	setBGColor (SkColor)
void	drawSizeBounds (SkCanvas *, SkColor)
bool	animate (double)
virtual bool	onChar (SkUnichar)
bool	getControls (SkMetaData *controls)
void	setControls (const SkMetaData &controls)
virtual void	modifyGrContextOptions (GrContextOptions *)
virtual void	modifyGraphiteContextOptions (skgpu::graphite::ContextOptions *) const
virtual bool	isBazelOnly () const
virtual std::map< std::string, std::string >	getGoldKeys () const

Protected Member Functions
SkString	getName () const override
SkISize	getISize () override
void	onDraw (SkCanvas *canvas) override
Protected Member Functions inherited from skiagm::GM
virtual DrawResult	onGpuSetup (SkCanvas *, SkString *, GraphiteTestContext *)
virtual void	onGpuTeardown ()
virtual void	onOnceBeforeDraw ()
virtual DrawResult	onDraw (SkCanvas *, SkString *errorMsg)
virtual bool	onAnimate (double)
virtual bool	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
GraphiteTestContext *	graphiteTestContext () const

Additional Inherited Members
Public Types inherited from skiagm::GM
enum	Mode { kGM_Mode , kSample_Mode , kBench_Mode }
using	DrawResult = skiagm::DrawResult
using	GraphiteTestContext = skiatest::graphite::GraphiteTestContext
Static Public Attributes inherited from skiagm::GM
static constexpr char	kErrorMsg_DrawSkippedGpuOnly []

Detailed Description

Definition at line 80 of file composeshader.cpp.

Constructor & Destructor Documentation

ComposeShaderAlphaGM()

ComposeShaderAlphaGM::ComposeShaderAlphaGM ( )

inline

Definition at line 82 of file composeshader.cpp.

{}

Member Function Documentation

getISize()

SkISize ComposeShaderAlphaGM::getISize ( )

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 87 of file composeshader.cpp.

{ return SkISize::Make(750, 220); }

getName()

SkString ComposeShaderAlphaGM::getName ( ) const

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 85 of file composeshader.cpp.

{ return SkString("composeshader_alpha"); }

onDraw()

void ComposeShaderAlphaGM::onDraw ( SkCanvas *  canvas )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 89 of file composeshader.cpp.

                                           {
        sk_sp<SkShader> shaders[] = {
            make_shader(SkBlendMode::kDstIn),
            make_shader(SkBlendMode::kSrcOver),
        };
 
        SkPaint paint;
        paint.setColor(SK_ColorGREEN);
 
        const SkRect r = SkRect::MakeXYWH(5, 5, 100, 100);
 
        for (size_t y = 0; y < std::size(shaders); ++y) {
            canvas->save();
            for (int alpha = 0xFF; alpha > 0; alpha -= 0x28) {
                paint.setAlphaf(1.0f);
                paint.setShader(nullptr);
                canvas->drawRect(r, paint);
 
                paint.setAlpha(alpha);
                paint.setShader(shaders[y]);
                canvas->drawRect(r, paint);
 
                canvas->translate(r.width() + 5, 0);
            }
            canvas->restore();
            canvas->translate(0, r.height() + 5);
        }
    }

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The documentation for this class was generated from the following file:

• third_party/skia/gm/composeshader.cpp