DrawGlyphsGM Class Reference

Inheritance diagram for DrawGlyphsGM:

Public Member Functions
void	onOnceBeforeDraw () override
SkString	getName () const override
SkISize	getISize () override
void	onDraw (SkCanvas *canvas) override
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

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 []
Protected Member Functions inherited from skiagm::GM
virtual DrawResult	onGpuSetup (SkCanvas *, SkString *, GraphiteTestContext *)
virtual void	onGpuTeardown ()
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 21 of file drawglyphs.cpp.

Member Function Documentation

getISize()

SkISize DrawGlyphsGM::getISize ( )

inlineoverridevirtual

Implements skiagm::GM.

Definition at line 53 of file drawglyphs.cpp.

{ return SkISize::Make(640, 480); }

getName()

SkString DrawGlyphsGM::getName ( ) const

inlineoverridevirtual

Implements skiagm::GM.

Definition at line 51 of file drawglyphs.cpp.

{ return SkString("drawglyphs"); }

onDraw()

void DrawGlyphsGM::onDraw ( SkCanvas *  canvas )

inlineoverridevirtual

Reimplemented from skiagm::GM.

Definition at line 55 of file drawglyphs.cpp.

                                           {
        canvas->drawGlyphs(fGlyphCount, fGlyphs.begin(), fPositions.begin(), {50, 100}, fFont,
                           SkPaint{});
 
        canvas->drawGlyphs(fGlyphCount, fGlyphs.begin(), fPositions.begin(), {50, 120}, fFont,
                           SkPaint{});
 
        // Check bounding box calculation.
        for (auto& pos : fPositions) {
            pos += {0, -500};
        }
        canvas->drawGlyphs(fGlyphCount, fGlyphs.begin(), fPositions.begin(), {50, 640}, fFont,
                           SkPaint{});
 
        canvas->drawGlyphs(fGlyphCount, fGlyphs.begin(), fXforms.begin(),
                           {50 + fLength / 2, 160 + fRadius}, fFont, SkPaint{});
 
        // TODO: add tests for cluster versions of drawGlyphs.
    }

onOnceBeforeDraw()

void DrawGlyphsGM::onOnceBeforeDraw ( )

inlineoverridevirtual

Reimplemented from skiagm::GM.

Definition at line 23 of file drawglyphs.cpp.

                                     {
        fTypeface = ToolUtils::CreatePortableTypeface("serif", SkFontStyle());
        fFont = SkFont(fTypeface);
        fFont.setSubpixel(true);
        fFont.setSize(18);
        const size_t txtLen = strlen(gText);
        fGlyphCount = fFont.countText(gText, txtLen, SkTextEncoding::kUTF8);
 
        fGlyphs.append(fGlyphCount);
        fFont.textToGlyphs(gText, txtLen, SkTextEncoding::kUTF8, fGlyphs.begin(), fGlyphCount);
 
        fPositions.append(fGlyphCount);
        fFont.getPos(fGlyphs.begin(), fGlyphCount, fPositions.begin());
        auto positions = SkSpan(fPositions.begin(), fGlyphCount);
 
        fLength = positions.back().x() - positions.front().x();
        fRadius = fLength / SK_FloatPI;
        fXforms.append(fGlyphCount);
 
        for (auto [xform, pos] : SkMakeZip(fXforms.begin(), positions)) {
            const SkScalar lengthToGlyph = pos.x() - positions.front().x();
            const SkScalar angle = SK_FloatPI * (fLength - lengthToGlyph) / fLength;
            const SkScalar cos = std::cos(angle);
            const SkScalar sin = std::sin(angle);
            xform = SkRSXform::Make(sin, cos, fRadius*cos, -fRadius*sin);
        }
    }

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

• third_party/skia/gm/drawglyphs.cpp