ArithmodeGM Class Reference

Inheritance diagram for ArithmodeGM:

Private Member Functions
SkString	getName () const override
SkISize	getISize () 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 void	onOnceBeforeDraw ()
virtual DrawResult	onDraw (SkCanvas *, SkString *errorMsg)
virtual bool	onAnimate (double)
virtual bool	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
GraphiteTestContext *	graphiteTestContext () const

Detailed Description

Definition at line 81 of file arithmode.cpp.

Member Function Documentation

getISize()

SkISize ArithmodeGM::getISize ( )

inlineoverrideprivatevirtual

Implements skiagm::GM.

Definition at line 84 of file arithmode.cpp.

{ return {640, 572}; }

getName()

SkString ArithmodeGM::getName ( ) const

inlineoverrideprivatevirtual

Implements skiagm::GM.

Definition at line 82 of file arithmode.cpp.

{ return SkString("arithmode"); }

onDraw()

void ArithmodeGM::onDraw ( SkCanvas *  canvas )

inlineoverrideprivatevirtual

Reimplemented from skiagm::GM.

Definition at line 86 of file arithmode.cpp.

                                           {
        constexpr int WW = 100,
                      HH = 32;
 
        sk_sp<SkImage> src = make_src(WW, HH);
        sk_sp<SkImage> dst = make_dst(WW, HH);
        sk_sp<SkImageFilter> srcFilter = SkImageFilters::Image(src, {SkFilterMode::kLinear});
        sk_sp<SkImageFilter> dstFilter = SkImageFilters::Image(dst, {SkFilterMode::kLinear});
 
        constexpr SkScalar one = SK_Scalar1;
        constexpr SkScalar K[] = {
            0, 0, 0, 0,
            0, 0, 0, one,
            0, one, 0, 0,
            0, 0, one, 0,
            0, one, one, 0,
            0, one, -one, 0,
            0, one/2, one/2, 0,
            0, one/2, one/2, one/4,
            0, one/2, one/2, -one/4,
            one/4, one/2, one/2, 0,
            -one/4, one/2, one/2, 0,
        };
 
        const SkScalar* k = K;
        const SkScalar* stop = k + std::size(K);
        // Many of the Arithmetic filters have a 4th coefficient that's not zero, which means they
        // affect transparent black. 'rect' is used as a crop filter to make sure they don't
        // overwrite each other.
        const SkRect rect = SkRect::MakeWH(WW, HH);
        SkScalar gap = SkIntToScalar(WW + 20);
        while (k < stop) {
            {
                SkAutoCanvasRestore acr(canvas, true);
                canvas->drawImage(src, 0, 0);
                canvas->translate(gap, 0);
                canvas->drawImage(dst, 0, 0);
                canvas->translate(gap, 0);
                SkPaint paint;
                paint.setImageFilter(SkImageFilters::Arithmetic(k[0], k[1], k[2], k[3], true,
                                                                dstFilter, srcFilter, rect));
                canvas->saveLayer(nullptr, &paint);
                canvas->restore();
 
                canvas->translate(gap, 0);
                show_k_text(canvas, 0, 0, k);
            }
 
            k += 4;
            canvas->translate(0, HH + 12);
        }
 
        // Draw two special cases to test enforcePMColor. In these cases, we
        // draw the dst bitmap twice, the first time it is halved and inverted,
        // leading to invalid premultiplied colors. If we enforcePMColor, these
        // invalid values should be clamped, and will not contribute to the
        // second draw.
        for (int i = 0; i < 2; i++) {
            const bool enforcePMColor = (i == 0);
 
            {
                SkAutoCanvasRestore acr(canvas, true);
                canvas->translate(gap, 0);
                canvas->drawImage(dst, 0, 0);
                canvas->translate(gap, 0);
 
                sk_sp<SkImageFilter> bg =
                        SkImageFilters::Arithmetic(0, 0, -one / 2, 1, enforcePMColor, dstFilter,
                                                   nullptr, nullptr);
                SkPaint p;
                p.setImageFilter(SkImageFilters::Arithmetic(0, one / 2, -one, 1, true,
                                                            std::move(bg), dstFilter, rect));
                canvas->saveLayer(nullptr, &p);
                canvas->restore();
                canvas->translate(gap, 0);
 
                // Label
                SkFont   font(ToolUtils::DefaultPortableTypeface(), 24);
                SkString str(enforcePMColor ? "enforcePM" : "no enforcePM");
                canvas->drawString(str, 0, font.getSize(), font, SkPaint());
            }
            canvas->translate(0, HH + 12);
        }
    }

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

• third_party/skia/gm/arithmode.cpp