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AbstractPainterBitmap

touchgfx/widgets/canvas/AbstractPainterBitmap.hpp

An abstract class for creating painter classes for drawing canvas widgets. All canvas widgets need a painter to fill the shape drawn with a CanvasWidgetRenderer. The painter must provide the color of a pixel on a given coordinate, which will the be blended into the framebuffer depending on the position of the canvas widget and the transparency of the given pixel.

The AbstractPainter also implements a function which will blend each pixel in a scanline snippet into the framebuffer, but for better performance, the function should be reimplemented in each painter.

Inherited by: PainterABGR2222Bitmap, PainterARGB2222Bitmap, PainterARGB8888Bitmap, PainterARGB8888L8Bitmap, PainterBGRA2222Bitmap, PainterBWBitmap, PainterGRAY2Bitmap, PainterGRAY4Bitmap, PainterRGB565Bitmap, PainterRGB565L8Bitmap, PainterRGB888Bitmap, PainterRGB888L8Bitmap, PainterRGBA2222Bitmap, PainterXRGB8888Bitmap, PainterXRGB8888L8Bitmap

Public Functions

AbstractPainterBitmap(const Bitmap & bmp =Bitmap(BITMAP_INVALID))
Constructor.
BitmapgetBitmap() const
Gets the bitmap previously set using setBitmap().
voidgetOffset(int16_t & x, int16_t & y)
Gets the bitmap offset previously set using setOffset().
boolgetTiled() const
Gets the tiled setting, previously set using setTiled().
virtual voidsetBitmap(const Bitmap & bmp)
Sets a bitmap to be used when drawing the CanvasWidget.
virtual voidsetOffset(int16_t x, int16_t y)
Sets an offset for the bitmap used.
virtual voidsetTiled(bool tiled)
Instruct the painter to tile the bitmap specified.
virtual ~AbstractPainterBitmap()
Destructor.

Protected Functions

booladjustBitmapXY(int16_t & bitmapX, int16_t & bitmapY, int16_t & offset, int16_t & count) const
Adjust bitmap x and y.
voidupdateBitmapOffsets(int16_t widgetWidth) const
Updates the bitmap offsets described by widgetWidth, these offset are used by bitmap painters adjust the coordinate position inside the widget.

Protected Attributes

Bitmapbitmap
The bitmap to be used when painting.
const uint8_t *bitmapData
Pointer to the bitmap data.
Bitmap::BitmapFormatbitmapFormat
Copy of the bitmap format (for speed reasons)
RectbitmapRect
Bitmap rectangle translated to framebuffer coordinates.
boolisTiled
True if bitmap should be tiled, false if not.
int16_txOffset
The x offset of the bitmap.
int16_tyOffset
The y offset of the bitmap.

Public Functions Documentation

AbstractPainterBitmap

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

Constructor.

Parameters:
bmp(Optional) The bitmap to use in the painter.

getBitmap

Bitmap getBitmap()const

Gets the bitmap previously set using setBitmap().

Returns:

The bitmap.

getOffset

void getOffset(int16_t &x ,
int16_t &y
)

Gets the bitmap offset previously set using setOffset().

Parameters:
xThe x coordinate.
yThe y coordinate.

getTiled

bool getTiled()const

Gets the tiled setting, previously set using setTiled().

Returns:

True if the bitmap is tiled, false otherwise.

setBitmap

setOffset

virtual void setOffset(int16_tx ,
int16_ty
)

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:
xThe x coordinate.
yThe y coordinate.
See also:

setTiled

virtual void setTiled(booltiled)

Instruct the painter to tile the bitmap specified.

The bitmap will be tiled both horizontally and vertically.

Parameters:
tiledTrue if tiled.
See also:

~AbstractPainterBitmap

Destructor.

Protected Functions Documentation

adjustBitmapXY

bool adjustBitmapXY(int16_t &bitmapX ,const
int16_t &bitmapY ,const
int16_t &offset ,const
int16_t &countconst
)const

Adjust bitmap x and y.

For a tiled bitmap painters, the coordinates are fixed to be inside the bitmap, for non-tiled bitmap painters, false is returned if the entire span (considering offset and count) is outside the bitmap - otherwise, the parameters are adjust to make sure that the requested number of pixels can be read from the bitmap at the given coordinate and count pixels ahead.

Parameters:
bitmapXThe bitmap x coordinate.
bitmapYThe bitmap y coordinate.
offsetThe pointer x coordinate.
countNumber of.
Returns:

True if anything should be painted, false if nothing has to be painted.

updateBitmapOffsets

void updateBitmapOffsets(int16_twidgetWidth)

Updates the bitmap offsets described by widgetWidth, these offset are used by bitmap painters adjust the coordinate position inside the widget.

Parameters:
widgetWidthWidth of the widget.

Protected Attributes Documentation

bitmap

Bitmap bitmap

The bitmap to be used when painting.

bitmapData

const uint8_t * bitmapData

Pointer to the bitmap data.

bitmapFormat

Bitmap::BitmapFormat bitmapFormat

Copy of the bitmap format (for speed reasons)

bitmapRect

Rect bitmapRect

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.