PainterGRAY2Bitmap

PainterGRAY2Bitmap will take the color for a given point in the shape from a bitmap. Please be aware, the the bitmap is used by the CanvasWidgetRenderer (not Shape), so any rotation you might specify for a CanvasWidget (e.g. Shape) is not applied to the bitmap as CWR is not aware of this rotation.

See: AbstractPainter

Inherits from: AbstractPainterGRAY2, AbstractPainter

Public Functions

	PainterGRAY2Bitmap(const Bitmap & bmp =Bitmap(BITMAP_INVALID))
	Initializes a new instance of the PainterGRAY2Bitmap 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	setBitmap(const Bitmap & bmp)
	Sets a bitmap to be used when drawing the CanvasWidget.
virtual void	setOffset(int16_t x, int16_t y)
	Sets an offset for the bitmap used.
virtual void	setTiled(bool tiled)
	Instruct the painter to tile the bitmap specified.

Protected Functions

virtual bool	renderInit()
	Initialize rendering of a single scan line of pixels for the render.

Protected Attributes

Bitmap	bitmap
	The bitmap to be used when painting.
const uint8_t *	bitmapAlphaPointer
	Pointer to the bitmap alpha data for GRAY2.
const uint8_t *	bitmapGRAY2Pointer
	Pointer to the bitmap (GRAY2)
Rect	bitmapRectToFrameBuffer
	Bitmap rectangle translated to framebuffer coordinates.
bool	isTiled
	True if bitmap should be tiled, false if not.
int16_t	xOffset
	The x offset of the bitmap.
int16_t	yOffset
	The y offset of the bitmap.

Additional inherited members

Public Functions inherited from AbstractPainterGRAY2

	AbstractPainterGRAY2()

Protected Functions inherited from AbstractPainterGRAY2

virtual bool	renderNext(uint8_t & gray, uint8_t & alpha)
	Get the color of the next pixel in the scan line to blend into the framebuffer.
virtual void	renderPixel(uint8_t * p, uint16_t offset, uint8_t gray)
	Renders (writes) the specified color into the framebuffer.

Protected Attributes inherited from AbstractPainterGRAY2

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

PainterGRAY2Bitmap

PainterGRAY2Bitmap	(	const Bitmap &	bmp =Bitmap(BITMAP_INVALID)	)

Initializes a new instance of the PainterGRAY2Bitmap class.

Parameters:

bmp	(Optional) The bitmap, default is BITMAP_INVALID.

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::AbstractPainterGRAY2::render

setBitmap

void setBitmap	(	const Bitmap &	bmp	)

Sets a bitmap to be used when drawing the CanvasWidget.

Parameters:

bmp	The bitmap.

setOffset

virtual void setOffset	(	int16_t	x ,
		int16_t	y
		)

Sets an offset for the bitmap used.

The x and y coordinates specifies how far the bitmap should be moved to the right and down. This works for tiled bitmaps and non-tiled bitmaps.

Parameters:

x	The x coordinate.
y	The y coordinate.

See also:

setTiled

setTiled

virtual void setTiled	(	bool	tiled	)

Instruct the painter to tile the bitmap specified.

The bitmap will be tiled both horizontally and vertically.

Parameters:

tiled	True if tiled.

See also:

setOffset

Protected Functions Documentation

renderInit

virtual bool renderInit	(			)

Initialize rendering of a single scan line of pixels for the render.

If renderInit returns false, the scanline will not be rendered.

Returns:

true if it succeeds, false if it fails.

Reimplements: touchgfx::AbstractPainterGRAY2::renderInit

Protected Attributes Documentation

bitmap

Bitmap bitmap

The bitmap to be used when painting.

bitmapAlphaPointer

const uint8_t * bitmapAlphaPointer

Pointer to the bitmap alpha data for GRAY2.

bitmapGRAY2Pointer

const uint8_t * bitmapGRAY2Pointer

Pointer to the bitmap (GRAY2)

bitmapRectToFrameBuffer

Rect bitmapRectToFrameBuffer

Bitmap rectangle translated to framebuffer coordinates.

isTiled

bool isTiled

True if bitmap should be tiled, false if not.

xOffset

int16_t xOffset

The x offset of the bitmap.

yOffset

int16_t yOffset

The y offset of the bitmap.