LowLevelGraphicsContext Class Reference

Interface class for graphics context objects, used internally by the Graphics class. More...

#include <juce_LowLevelGraphicsContext.h>

Public Member Functions
virtual	~LowLevelGraphicsContext ()=default
virtual bool	isVectorDevice () const =0
	Returns true if this device is vector-based, e.g.
virtual void	setOrigin (Point< int >)=0
	Moves the origin to a new position.
virtual void	addTransform (const AffineTransform &)=0
virtual float	getPhysicalPixelScaleFactor () const =0
virtual bool	clipToRectangle (const Rectangle< int > &)=0
virtual bool	clipToRectangleList (const RectangleList< int > &)=0
virtual void	excludeClipRectangle (const Rectangle< int > &)=0
virtual void	clipToPath (const Path &, const AffineTransform &)=0
virtual void	clipToImageAlpha (const Image &, const AffineTransform &)=0
virtual bool	clipRegionIntersects (const Rectangle< int > &)=0
virtual Rectangle< int >	getClipBounds () const =0
virtual bool	isClipEmpty () const =0
virtual void	saveState ()=0
virtual void	restoreState ()=0
virtual void	beginTransparencyLayer (float opacity)=0
virtual void	endTransparencyLayer ()=0
virtual void	setFill (const FillType &)=0
virtual void	setOpacity (float)=0
virtual void	setInterpolationQuality (Graphics::ResamplingQuality)=0
virtual void	fillAll ()
virtual void	fillRect (const Rectangle< int > &, bool replaceExistingContents)=0
virtual void	fillRect (const Rectangle< float > &)=0
virtual void	fillRectList (const RectangleList< float > &)=0
virtual void	fillPath (const Path &, const AffineTransform &)=0
virtual void	drawRect (const Rectangle< float > &rect, float lineThickness)
virtual void	strokePath (const Path &path, const PathStrokeType &strokeType, const AffineTransform &transform)
virtual void	drawImage (const Image &, const AffineTransform &)=0
virtual void	drawLine (const Line< float > &)=0
virtual void	drawLineWithThickness (const Line< float > &line, float lineThickness)
virtual void	setFont (const Font &)=0
virtual const Font &	getFont ()=0
virtual void	drawGlyphs (Span< const uint16_t >, Span< const Point< float > >, const AffineTransform &)=0
	Uses the current font to draw the provided glyph numbers.
virtual void	drawRoundedRectangle (const Rectangle< float > &r, float cornerSize, float lineThickness)
virtual void	fillRoundedRectangle (const Rectangle< float > &r, float cornerSize)
virtual void	drawEllipse (const Rectangle< float > &area, float lineThickness)
virtual void	fillEllipse (const Rectangle< float > &area)
virtual uint64_t	getFrameId () const =0
	Returns an integer that uniquely identifies the current frame.

Protected Member Functions
	LowLevelGraphicsContext ()=default

Detailed Description

Interface class for graphics context objects, used internally by the Graphics class.

Users are not supposed to create instances of this class directly - do your drawing via the Graphics object instead.

It's a base class for different types of graphics context, that may perform software-based or OS-accelerated rendering.

E.g. the LowLevelGraphicsSoftwareRenderer renders onto an image in memory, but other subclasses could render directly to a windows HDC, a Quartz context, or an OpenGL context.

Constructor & Destructor Documentation

LowLevelGraphicsContext()

LowLevelGraphicsContext::LowLevelGraphicsContext ( )

protecteddefault

~LowLevelGraphicsContext()

virtual LowLevelGraphicsContext::~LowLevelGraphicsContext ( )

virtualdefault

Member Function Documentation

isVectorDevice()

virtual bool LowLevelGraphicsContext::isVectorDevice ( ) const

pure virtual

Returns true if this device is vector-based, e.g.

a printer.

setOrigin()

virtual void LowLevelGraphicsContext::setOrigin ( Point< int > )

pure virtual

Moves the origin to a new position.

The coordinates are relative to the current origin, and indicate the new position of (0, 0).

addTransform()

virtual void LowLevelGraphicsContext::addTransform ( const AffineTransform & )

pure virtual

getPhysicalPixelScaleFactor()

virtual float LowLevelGraphicsContext::getPhysicalPixelScaleFactor ( ) const

pure virtual

clipToRectangle()

virtual bool LowLevelGraphicsContext::clipToRectangle ( const Rectangle< int > & )

pure virtual

clipToRectangleList()

virtual bool LowLevelGraphicsContext::clipToRectangleList ( const RectangleList< int > & )

pure virtual

excludeClipRectangle()

virtual void LowLevelGraphicsContext::excludeClipRectangle ( const Rectangle< int > & )

pure virtual

clipToPath()

virtual void LowLevelGraphicsContext::clipToPath ( const Path & , const AffineTransform &  )

pure virtual

clipToImageAlpha()

virtual void LowLevelGraphicsContext::clipToImageAlpha ( const Image & , const AffineTransform &  )

pure virtual

clipRegionIntersects()

virtual bool LowLevelGraphicsContext::clipRegionIntersects ( const Rectangle< int > & )

pure virtual

getClipBounds()

virtual Rectangle< int > LowLevelGraphicsContext::getClipBounds ( ) const

pure virtual

isClipEmpty()

virtual bool LowLevelGraphicsContext::isClipEmpty ( ) const

pure virtual

saveState()

virtual void LowLevelGraphicsContext::saveState ( )

pure virtual

restoreState()

virtual void LowLevelGraphicsContext::restoreState ( )

pure virtual

beginTransparencyLayer()

virtual void LowLevelGraphicsContext::beginTransparencyLayer ( float opacity )

pure virtual

endTransparencyLayer()

virtual void LowLevelGraphicsContext::endTransparencyLayer ( )

pure virtual

setFill()

virtual void LowLevelGraphicsContext::setFill ( const FillType & )

pure virtual

setOpacity()

virtual void LowLevelGraphicsContext::setOpacity ( float )

pure virtual

setInterpolationQuality()

virtual void LowLevelGraphicsContext::setInterpolationQuality ( Graphics::ResamplingQuality )

pure virtual

fillAll()

virtual void LowLevelGraphicsContext::fillAll ( )

virtual

fillRect() [1/2]

virtual void LowLevelGraphicsContext::fillRect ( const Rectangle< int > & , bool replaceExistingContents )

pure virtual

fillRect() [2/2]

virtual void LowLevelGraphicsContext::fillRect ( const Rectangle< float > & )

pure virtual

fillRectList()

virtual void LowLevelGraphicsContext::fillRectList ( const RectangleList< float > & )

pure virtual

fillPath()

virtual void LowLevelGraphicsContext::fillPath ( const Path & , const AffineTransform &  )

pure virtual

drawRect()

virtual void LowLevelGraphicsContext::drawRect ( const Rectangle< float > & rect, float lineThickness )

virtual

References RectangleList< ValueType >::addWithoutMerging().

strokePath()

virtual void LowLevelGraphicsContext::strokePath ( const Path & path, const PathStrokeType & strokeType, const AffineTransform & transform )

virtual

References PathStrokeType::createStrokedPath().

drawImage()

virtual void LowLevelGraphicsContext::drawImage ( const Image & , const AffineTransform &  )

pure virtual

drawLine()

virtual void LowLevelGraphicsContext::drawLine ( const Line< float > & )

pure virtual

drawLineWithThickness()

virtual void LowLevelGraphicsContext::drawLineWithThickness ( const Line< float > & line, float lineThickness )

virtual

References Path::addLineSegment().

setFont()

virtual void LowLevelGraphicsContext::setFont ( const Font & )

pure virtual

getFont()

virtual const Font & LowLevelGraphicsContext::getFont ( )

pure virtual

drawGlyphs()

virtual void LowLevelGraphicsContext::drawGlyphs ( Span< const uint16_t > , Span< const Point< float > > , const AffineTransform &  )

pure virtual

Uses the current font to draw the provided glyph numbers.

drawRoundedRectangle()

virtual void LowLevelGraphicsContext::drawRoundedRectangle ( const Rectangle< float > & r, float cornerSize, float lineThickness )

virtual

References Path::addRoundedRectangle().

fillRoundedRectangle()

virtual void LowLevelGraphicsContext::fillRoundedRectangle ( const Rectangle< float > & r, float cornerSize )

virtual

References Path::addRoundedRectangle().

drawEllipse()

virtual void LowLevelGraphicsContext::drawEllipse ( const Rectangle< float > & area, float lineThickness )

virtual

References Path::addEllipse(), approximatelyEqual(), Rectangle< ValueType >::expanded(), Rectangle< ValueType >::getHeight(), Rectangle< ValueType >::getWidth(), Rectangle< ValueType >::reduced(), and Path::setUsingNonZeroWinding().

fillEllipse()

virtual void LowLevelGraphicsContext::fillEllipse ( const Rectangle< float > & area )

virtual

References Path::addEllipse().

getFrameId()

virtual uint64_t LowLevelGraphicsContext::getFrameId ( ) const

pure virtual

Returns an integer that uniquely identifies the current frame.

Useful for debugging/logging.

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

• juce_LowLevelGraphicsContext.h