PerspTextGM Class Reference

Inheritance diagram for PerspTextGM:

Public Member Functions
	PerspTextGM (bool minimal)
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 30 of file persptext.cpp.

Constructor & Destructor Documentation

PerspTextGM()

PerspTextGM::PerspTextGM ( bool  minimal )

inline

Definition at line 32 of file persptext.cpp.

                              : fMinimal(minimal) {
        this->setBGColor(0xFFFFFFFF);
    }

Member Function Documentation

getISize()

SkISize PerspTextGM::getISize ( )

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 41 of file persptext.cpp.

{ return SkISize::Make(1024, 768); }

getName()

SkString PerspTextGM::getName ( ) const

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 37 of file persptext.cpp.

                                      {
        return SkString(fMinimal ? "persptext_minimal" : "persptext");
    }

onDraw()

void PerspTextGM::onDraw ( SkCanvas *  canvas )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 45 of file persptext.cpp.

                                           {
 
        canvas->clear(0xffffffff);
 
        SkPaint paint;
        paint.setAntiAlias(true);
 
        SkFont font(ToolUtils::CreatePortableTypeface("serif", SkFontStyle()));
        font.setSubpixel(true);
        font.setSize(32);
        font.setBaselineSnap(false);
 
        const char* text = "Hamburgefons";
        const size_t textLen = strlen(text);
 
        SkScalar textWidth = font.measureText(text, textLen, SkTextEncoding::kUTF8,
                                              nullptr, nullptr);
        SkScalar textHeight = font.getMetrics(nullptr);
 
        SkScalar x = 10, y = textHeight + 5.f;
        const int kSteps = 8;
        float kMinimalFactor = fMinimal ? 32.f : 1.f;
        for (auto pm : {PerspMode::kX, PerspMode::kY, PerspMode::kXY}) {
            for (int i = 0; i < kSteps; ++i) {
                canvas->save();
#ifdef TEST_PERSP_CHECK
                // draw non-perspective text in the background for comparison
                paint.setColor(SK_ColorRED);
                canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, x, y, font, paint);
#endif
 
                SkMatrix persp = SkMatrix::I();
                switch (pm) {
                    case PerspMode::kX:
                        if (fMinimal) {
                            persp.setPerspX(i*0.0005f/kSteps/kMinimalFactor);
                        } else {
                            persp.setPerspX(i*0.00025f/kSteps);
                        }
                        break;
                    case PerspMode::kY:
                        persp.setPerspY(i*0.0025f/kSteps/kMinimalFactor);
                        break;
                    case PerspMode::kXY:
                        persp.setPerspX(i*-0.00025f/kSteps/kMinimalFactor);
                        persp.setPerspY(i*-0.00125f/kSteps/kMinimalFactor);
                        break;
                }
                persp = SkMatrix::Concat(persp, SkMatrix::Translate(-x, -y));
                persp = SkMatrix::Concat(SkMatrix::Translate(x, y), persp);
                canvas->concat(persp);
 
                paint.setColor(SK_ColorBLACK);
#ifdef TEST_PERSP_CHECK
                // Draw text as red if it is nearly affine
                SkRect bounds = SkRect::MakeXYWH(0, -textHeight, textWidth, textHeight);
                bounds.offset(x, y);
                if (SkMatrixPriv::NearlyAffine(persp, bounds, SK_Scalar1/(1 << 4))) {
                    paint.setColor(SK_ColorRED);
                }
#endif
                canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, x, y, font, paint);
 
                y += textHeight + 5.f;
                canvas->restore();
            }
 
            x += textWidth + 10.f;
            y = textHeight + 5.f;
        }
 
    }

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

• third_party/skia/gm/persptext.cpp