ManyBlockAllocator

This class is partial framebuffer allocator using multiple blocks. New buffers can be allocated until no free blocks are available. After transfer to LCD, a block is queued for allocation again.

See: FrameBufferAllocator

Inherits from: FrameBufferAllocator

Public Functions


virtual uint16_t	allocateBlock(const uint16_t x, const uint16_t y, const uint16_t width, const uint16_t height, uint8_t ** block)
	Allocates a framebuffer block.

virtual void	freeBlockAfterTransfer()
	Free a block after transfer to the LCD.

virtual const uint8_t *	getBlockForTransfer(Rect & rect)
	Get the block ready for transfer.

virtual bool	hasBlockReadyForTransfer()
	Check if a block is ready for transfer to the LCD.

virtual bool	hasEmptyBlock()
	Check if a block is ready for drawing (the block is empty).

	ManyBlockAllocator()


virtual void	markBlockReadyForTransfer()
	Marks a previously allocated block as ready to be transferred to the LCD.

virtual const Rect &	peekBlockForTransfer()
	Get the Rect of the next block to transfer.

Additional inherited members

Protected Types inherited from FrameBufferAllocator


enum	BlockState { EMPTY, ALLOCATED, DRAWN, SENDING }
	BlockState is used for internal state of each block.

Public Functions inherited from FrameBufferAllocator


virtual	~FrameBufferAllocator()
	Finalizes an instance of the FrameBufferAllocator class.

Public Functions Documentation

allocateBlock

Allocates a framebuffer block.

The block will have at least the width requested. The height of the allocated block can be lower than requested if not enough memory is available.

Parameters:


x	The absolute x coordinate of the block on the screen.
y	The absolute y coordinate of the block on the screen.
width	The width of the block.
height	The height of the block.
block	Pointer to pointer to return the block address in.

Returns:

The height of the allocated block.

Reimplements: touchgfx::FrameBufferAllocator::allocateBlock

freeBlockAfterTransfer


virtual void freeBlockAfterTransfer	(			)

Free a block after transfer to the LCD.

Marks a previously allocated block as transferred and ready to reuse.

Reimplements: touchgfx::FrameBufferAllocator::freeBlockAfterTransfer

getBlockForTransfer

Get the block ready for transfer.

Parameters:


rect	Reference to rect to write block x, y, width, and height.

Returns:

Returns the address of the block ready for transfer.

Reimplements: touchgfx::FrameBufferAllocator::getBlockForTransfer

hasBlockReadyForTransfer


virtual bool hasBlockReadyForTransfer	(			)

Check if a block is ready for transfer to the LCD.

Returns:

True if a block is ready for transfer.

Reimplements: touchgfx::FrameBufferAllocator::hasBlockReadyForTransfer

hasEmptyBlock


virtual bool hasEmptyBlock	(			)

Check if a block is ready for drawing (the block is empty).

Returns:

True if a block is empty.

Reimplements: touchgfx::FrameBufferAllocator::hasEmptyBlock