ArithmodeBlenderGM Class Reference

Inheritance diagram for ArithmodeBlenderGM:

Private Member Functions
SkString	getName () const override
SkISize	getISize () override
void	onOnceBeforeDraw () override
bool	onAnimate (double nanos) override
void	onDraw (SkCanvas *canvas) override

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
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
Static Public Attributes inherited from skiagm::GM
static constexpr char	kErrorMsg_DrawSkippedGpuOnly []
Protected Member Functions inherited from skiagm::GM
virtual DrawResult	onGpuSetup (SkCanvas *, SkString *, GraphiteTestContext *)
virtual void	onGpuTeardown ()
virtual DrawResult	onDraw (SkCanvas *, SkString *errorMsg)
virtual bool	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
GraphiteTestContext *	graphiteTestContext () const

Detailed Description

Definition at line 180 of file arithmode.cpp.

Member Function Documentation

getISize()

SkISize ArithmodeBlenderGM::getISize ( )

inlineoverrideprivatevirtual

Implements skiagm::GM.

Definition at line 191 of file arithmode.cpp.

{ return {(W + 30) * 2, (H + 30) * 4}; }

getName()

SkString ArithmodeBlenderGM::getName ( ) const

inlineoverrideprivatevirtual

Implements skiagm::GM.

Definition at line 186 of file arithmode.cpp.

{ return SkString("arithmode_blender"); }

onAnimate()

bool ArithmodeBlenderGM::onAnimate ( double  nanos )

inlineoverrideprivatevirtual

Reimplemented from skiagm::GM.

Definition at line 221 of file arithmode.cpp.

                                          {
        double theta = nanos * 1e-6 * 0.001;
        fK1 = sin(theta + 0) * 0.25;
        fK2 = cos(theta + 1) * 0.25;
        fK3 = sin(theta + 2) * 0.25;
        fK4 = 0.5;
        return true;
    }

onDraw()

void ArithmodeBlenderGM::onDraw ( SkCanvas *  canvas )

inlineoverrideprivatevirtual

Reimplemented from skiagm::GM.

Definition at line 230 of file arithmode.cpp.

                                           {
        const SkRect rect = SkRect::MakeWH(W, H);
 
        canvas->drawImage(fSrc, 10, 10);
        canvas->drawImage(fDst, 10, 10 + H + 10);
 
        SkSamplingOptions sampling;
        sk_sp<SkBlender> blender = SkBlenders::Arithmetic(fK1, fK2, fK3, fK4,
                                                          /*enforcePremul=*/true);
        canvas->translate(10 + W + 10, 10);
 
        // All three images drawn below should appear identical.
        // Draw via blend step
        SkPaint blenderPaint;
        canvas->drawImage(fChecker, 0, 0);
        canvas->saveLayer(&rect, nullptr);
        canvas->drawImage(fDst, 0, 0);
        blenderPaint.setBlender(blender);
        canvas->drawImage(fSrc, 0, 0, sampling, &blenderPaint);
        canvas->restore();
 
        canvas->translate(0, 10 + H);
 
        // Draw via SkImageFilters::Blend (should appear the same as above)
        SkPaint imageFilterPaint;
        canvas->drawImage(fChecker, 0, 0);
        imageFilterPaint.setImageFilter(
                SkImageFilters::Blend(blender,
                                      /*background=*/nullptr,
                                      /*foreground=*/SkImageFilters::Image(fSrc, sampling)));
        canvas->drawImage(fDst, 0, 0, sampling, &imageFilterPaint);
 
        canvas->translate(0, 10 + H);
 
        // Draw via SkShaders::Blend (should still appear the same as above)
        SkPaint shaderBlendPaint;
        canvas->drawImage(fChecker, 0, 0);
        shaderBlendPaint.setShader(SkShaders::Blend(blender, fDstShader, fSrcShader));
        canvas->drawRect(rect, shaderBlendPaint);
 
        canvas->translate(0, 10 + H);
 
        // Draw via runtime effect (should still appear the same as above)
        SkPaint runtimePaint;
        canvas->drawImage(fChecker, 0, 0);
        SkRuntimeEffect::ChildPtr children[] = {fSrcShader, fDstShader, blender};
        runtimePaint.setShader(fRuntimeEffect->makeShader(/*uniforms=*/{}, children));
        canvas->drawRect(rect, runtimePaint);
    }

onOnceBeforeDraw()

void ArithmodeBlenderGM::onOnceBeforeDraw ( )

inlineoverrideprivatevirtual

Reimplemented from skiagm::GM.

Definition at line 193 of file arithmode.cpp.

                                     {
        // Prepare a runtime effect for this blend.
        static constexpr char kShader[] = R"(
            uniform shader srcImage;
            uniform shader dstImage;
            uniform blender arithBlend;
            half4 main(float2 xy) {
                return arithBlend.eval(srcImage.eval(xy), dstImage.eval(xy));
            }
        )";
        auto [effect, error] = SkRuntimeEffect::MakeForShader(SkString(kShader));
        SkASSERT(effect);
        fRuntimeEffect = effect;
 
        // Start with interesting K-values, in case we're drawn without calling onAnimate().
        fK1 = -0.25f;
        fK2 =  0.25f;
        fK3 =  0.25f;
        fK4 =  0;
 
        fSrc = make_src(W, H);
        fDst = make_dst(W, H);
        fSrcShader = fSrc->makeShader(SkTileMode::kClamp, SkTileMode::kClamp, SkSamplingOptions());
        fDstShader = fDst->makeShader(SkTileMode::kClamp, SkTileMode::kClamp, SkSamplingOptions());
 
        fChecker = ToolUtils::create_checkerboard_image(W, H, 0xFFBBBBBB, 0xFFEEEEEE, 8);
    }

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

• third_party/skia/gm/arithmode.cpp