PainterARGB2222

The PainterARGB2222 class allows a shape to be filled with a given color value. This allows anti-aliased elements to be drawn.

See: AbstractPainter

Inherits from: AbstractPainterARGB2222, AbstractPainter

Public Functions

colortype	getColor() const
	Gets the current color.
	PainterARGB2222(colortype color =0)
	Initializes a new instance of the PainterARGB2222 class.
virtual void	render(uint8_t ptr, int x, int xAdjust, int y, unsigned count, const uint8_t covers)
	Paint a designated part of the RenderingBuffer with respect to the amount of coverage of each pixel given by the parameter covers.
void	setColor(colortype color)
	Sets color and alpha to use when drawing the CanvasWidget.

Protected Functions

virtual bool	renderNext(uint8_t & red, uint8_t & green, uint8_t & blue, uint8_t & alpha)
	Get the color of the next pixel in the scan line to blend into the framebuffer.

Protected Attributes

uint8_t	painterBlue
	The blue part of the color, scaled up to [0..255].
colortype	painterColor
	The color.
uint8_t	painterGreen
	The green part of the color, scaled up to [0..255].
uint8_t	painterRed
	The red part of the color, scaled up to [0..255].

Additional inherited members

Public Functions inherited from AbstractPainterARGB2222

	AbstractPainterARGB2222()
FORCE_INLINE_FUNCTION uint8_t	mixColors(uint8_t newpix, uint8_t bufpix, uint8_t alpha)
	Mix colors from a new pixel and a buffer pixel with the given alpha applied to the new pixel, and the inverse alpha applied to the buffer pixel.
FORCE_INLINE_FUNCTION uint8_t	mixColors(uint8_t R, uint8_t G, uint8_t B, uint8_t bufpix, uint8_t alpha)
	Mix colors from a new pixel and a buffer pixel with the given alpha applied to the new pixel, and the inverse alpha applied to the buffer pixel.

Protected Functions inherited from AbstractPainterARGB2222

virtual bool	renderInit()
	Initialize rendering of a single scan line of pixels for the render.
virtual void	renderPixel(uint8_t * p, uint8_t red, uint8_t green, uint8_t blue)
	Renders (writes) the specified color into the framebuffer.

Protected Attributes inherited from AbstractPainterARGB2222

int	currentX
	Current x coordinate relative to the widget.
int	currentY
	Current y coordinate relative to the widget.

Public Functions inherited from AbstractPainter

	AbstractPainter()
	Initializes a new instance of the AbstractPainter class.
virtual	~AbstractPainter()
	Finalizes an instance of the AbstractPainter class.

Protected Functions inherited from AbstractPainter

void	setAreaOffset(uint16_t offsetX, uint16_t offsetY)
	Sets the offset of the area being drawn.
void	setWidgetAlpha(const uint8_t alpha)
	Sets the widget alpha to allow an entire canvas widget to easily be faded without changing the painter of the widget.
FORCE_INLINE_FUNCTION bool	compatibleFramebuffer(Bitmap::BitmapFormat format)
	Helper function to check if the provided bitmap format matches the current framebuffer format.

Protected Attributes inherited from AbstractPainter

int16_t	areaOffsetX
	The offset x coordinate of the area being drawn.
int16_t	areaOffsetY
	The offset y coordinate of the area being drawn.
uint8_t	widgetAlpha
	The alpha of the widget using the painter.

Public Functions Documentation

getColor

colortype getColor	(			)	const

Gets the current color.

Returns:

The color.

PainterARGB2222

PainterARGB2222	(	colortype	color =0	)

Initializes a new instance of the PainterARGB2222 class.

Parameters:

color	(Optional) the color, default is black.

render

virtual void render	(	uint8_t *	ptr ,
		int	x ,
		int	xAdjust ,
		int	y ,
		unsigned	count ,
		const uint8_t *	covers
		)

Paint a designated part of the RenderingBuffer with respect to the amount of coverage of each pixel given by the parameter covers.

The cover is the alpha for each pixel, which is what makes it possible to have smooth anti-aliased edges on the shapes drawn with CanvasWidgetRenderer.

Parameters:

ptr	Pointer to the row in the RenderingBuffer.
x	The x coordinate.
xAdjust	The minor adjustment of x (used when a pixel is smaller than a byte to specify that the ptr should have been advanced "xAdjust" pixels futher into the byte).
y	The y coordinate.
count	Number of pixels to fill.
covers	The coverage in of each pixel.

Note

The implementation of render() in the AbstractPainter classes is a generic (i.e. slow) implementation that should be completely implemented in subclasses of AbstractPainter for better performance.

Reimplements: touchgfx::AbstractPainterARGB2222::render

setColor

void setColor	(	colortype	color	)

Sets color and alpha to use when drawing the CanvasWidget.

Parameters:

color	The color.

Protected Functions Documentation

renderNext

virtual bool renderNext	(	uint8_t &	red ,
		uint8_t &	green ,
		uint8_t &	blue ,
		uint8_t &	alpha
		)

Get the color of the next pixel in the scan line to blend into the framebuffer.

Parameters:

red	The red.
green	The green.
blue	The blue.
alpha	The alpha.

Returns:

true if the pixel should be painted, false otherwise.

Reimplements: touchgfx::AbstractPainterARGB2222::renderNext

Protected Attributes Documentation

painterBlue

uint8_t painterBlue

The blue part of the color, scaled up to [0..255].

painterColor

colortype painterColor

The color.

painterGreen

uint8_t painterGreen

The green part of the color, scaled up to [0..255].

painterRed

uint8_t painterRed

The red part of the color, scaled up to [0..255].