AbstractPainterBGRA2222
The AbstractPainterBGRA2222 class is an abstract class for creating a painter to draw on a BGRA2222 display using CanvasWidgetRenderer.
See: AbstractPainter
Inherits from: AbstractPainter
Inherited by: PainterBGRA2222, PainterBGRA2222Bitmap
Public Functions
AbstractPainterBGRA2222() | |
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. | |
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. | |
Protected Functions
virtual bool | renderInit() |
Initialize rendering of a single scan line of pixels for the render. | |
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. | |
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
int | currentX |
Current x coordinate relative to the widget. | |
int | currentY |
Current y coordinate relative to the widget. | |
Additional inherited members
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
AbstractPainterBGRA2222
mixColors
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.
newpix | The new pixel value. |
bufpix | The buffer pixel value. |
alpha | The alpha to apply to the new pixel. |
The result of blending the two colors into a new color.
mixColors
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.
R | The red color. |
G | The green color. |
B | The blue color. |
bufpix | The buffer pixel value. |
alpha | The alpha of the R,G,B. |
The result of blending the two colors into a new color.
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.
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::AbstractPainter::render
Reimplemented by: touchgfx::PainterBGRA2222::render, touchgfx::PainterBGRA2222Bitmap::render
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.
true if it succeeds, false if it fails.
Reimplemented by: touchgfx::PainterBGRA2222Bitmap::renderInit
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.
red | The red. |
green | The green. |
blue | The blue. |
alpha | The alpha. |
true if the pixel should be painted, false otherwise.
Reimplemented by: touchgfx::PainterBGRA2222::renderNext
renderPixel
virtual void renderPixel | ( | uint8_t * | p , | ||
uint8_t | red , | ||||
uint8_t | green , | ||||
uint8_t | blue | ||||
) |
Renders (writes) the specified color into the framebuffer.
p | pointer into the framebuffer where the given color should be written. |
red | The red color. |
green | The green color. |
blue | The blue color. |
Protected Attributes Documentation
currentX
int currentX
Current x coordinate relative to the widget.
currentY
int currentY
Current y coordinate relative to the widget.