How all blitters should look like. More...

#include <base.hpp>

Inheritance diagram for Blitter:

Data Structures
struct	BlitterParams
	Parameters related to blitting. More...

Public Types
enum	PaletteAnimation { PALETTE_ANIMATION_NONE , PALETTE_ANIMATION_VIDEO_BACKEND , PALETTE_ANIMATION_BLITTER }
	Types of palette animation. More...

Public Member Functions
virtual uint8_t	GetScreenDepth ()=0
	Get the screen depth this blitter works for. More...

bool	Is32BppSupported () override
	Can the sprite encoder make use of RGBA sprites?

virtual void	Draw (Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)=0
	Draw an image to the screen, given an amount of params defined above.

virtual void	DrawColourMappingRect (void *dst, int width, int height, PaletteID pal)=0
	Draw a colourtable to the screen. More...

virtual void *	MoveTo (void *video, int x, int y)=0
	Move the destination pointer the requested amount x and y, keeping in mind any pitch and bpp of the renderer. More...

virtual void	SetPixel (void *video, int x, int y, uint8_t colour)=0
	Draw a pixel with a given colour on the video-buffer. More...

virtual void	DrawRect (void *video, int width, int height, uint8_t colour)=0
	Make a single horizontal line in a single colour on the video-buffer. More...

virtual void	DrawLine (void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8_t colour, int width, int dash=0)=0
	Draw a line with a given colour. More...

virtual void	CopyFromBuffer (void video, const void src, int width, int height)=0
	Copy from a buffer to the screen. More...

virtual void	CopyToBuffer (const void video, void dst, int width, int height)=0
	Copy from the screen to a buffer. More...

virtual void	CopyImageToBuffer (const void video, void dst, int width, int height, int dst_pitch)=0
	Copy from the screen to a buffer in a palette format for 8bpp and RGBA format for 32bpp. More...

virtual void	ScrollBuffer (void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)=0
	Scroll the videobuffer some 'x' and 'y' value. More...

virtual size_t	BufferSize (uint width, uint height)=0
	Calculate how much memory there is needed for an image of this size in the video-buffer. More...

virtual void	PaletteAnimate (const Palette &palette)=0
	Called when the 8bpp palette is changed; you should redraw all pixels on the screen that are equal to the 8bpp palette indexes 'first_dirty' to 'first_dirty + count_dirty'. More...

virtual Blitter::PaletteAnimation	UsePaletteAnimation ()=0
	Check if the blitter uses palette animation at all. More...

virtual bool	NeedsAnimationBuffer ()
	Does this blitter require a separate animation buffer from the video backend?

virtual std::string_view	GetName ()=0
	Get the name of the blitter, the same as the Factory-instance returns.

virtual void	PostResize ()
	Post resize event.

template<typename SetPixelT >
void	DrawLineGeneric (int x, int y, int x2, int y2, int screen_width, int screen_height, int width, int dash, SetPixelT set_pixel)

Public Member Functions inherited from SpriteEncoder
virtual Sprite *	Encode (const SpriteLoader::SpriteCollection &sprite, SpriteAllocator &allocator)=0
	Convert a sprite from the loader to our own format.

virtual uint	GetSpriteAlignment ()
	Get the value which the height and width on a sprite have to be aligned by. More...

Detailed Description

How all blitters should look like.

Extend this class to make your own.

Definition at line 29 of file base.hpp.

Member Enumeration Documentation

◆ PaletteAnimation

enum Blitter::PaletteAnimation

Types of palette animation.

Enumerator
PALETTE_ANIMATION_NONE	No palette animation.
PALETTE_ANIMATION_VIDEO_BACKEND	Palette animation should be done by video backend (8bpp only!)
PALETTE_ANIMATION_BLITTER	The blitter takes care of the palette animation.

Definition at line 50 of file base.hpp.

Member Function Documentation

◆ BufferSize()

virtual size_t Blitter::BufferSize	(	uint	width,
		uint	height
	)

pure virtual

Calculate how much memory there is needed for an image of this size in the video-buffer.

Parameters

width	The width of the buffer-to-be.
height	The height of the buffer-to-be.

Returns: The size needed for the buffer.

Implemented in Blitter_Null, Blitter_8bppBase, Blitter_40bppAnim, Blitter_32bppBase, and Blitter_32bppAnim.

◆ CopyFromBuffer()

virtual void Blitter::CopyFromBuffer	(	void *	video,
		const void *	src,
		int	width,
		int	height
	)

pure virtual

Copy from a buffer to the screen.

Parameters

video	The destination pointer (video-buffer).
src	The buffer from which the data will be read.
width	The width of the buffer.
height	The height of the buffer.

Note: You can not do anything with the content of the buffer, as the blitter can store non-pixel data in it too!

Implemented in Blitter_8bppBase, Blitter_40bppAnim, Blitter_32bppBase, Blitter_32bppAnim, and Blitter_Null.

◆ CopyImageToBuffer()

virtual void Blitter::CopyImageToBuffer	(	const void *	video,
		void *	dst,
		int	width,
		int	height,
		int	dst_pitch
	)

pure virtual

Copy from the screen to a buffer in a palette format for 8bpp and RGBA format for 32bpp.

Parameters

video	The destination pointer (video-buffer).
dst	The buffer in which the data will be stored.
width	The width of the buffer.
height	The height of the buffer.
dst_pitch	The pitch (byte per line) of the destination buffer.

Implemented in Blitter_8bppBase, Blitter_40bppAnim, Blitter_32bppBase, and Blitter_Null.

◆ CopyToBuffer()

virtual void Blitter::CopyToBuffer	(	const void *	video,
		void *	dst,
		int	width,
		int	height
	)

pure virtual

Copy from the screen to a buffer.

Parameters

video	The destination pointer (video-buffer).
dst	The buffer in which the data will be stored.
width	The width of the buffer.
height	The height of the buffer.

Note: You can not do anything with the content of the buffer, as the blitter can store non-pixel data in it too!

Implemented in Blitter_8bppBase, Blitter_40bppAnim, Blitter_32bppBase, Blitter_32bppAnim, and Blitter_Null.

◆ DrawColourMappingRect()

virtual void Blitter::DrawColourMappingRect	(	void *	dst,
		int	width,
		int	height,
		PaletteID	pal
	)

pure virtual

Draw a colourtable to the screen.

This is: the colour of the screen is read and is looked-up in the palette to match a new colour, which then is put on the screen again.

Parameters

dst	the destination pointer (video-buffer).
width	the width of the buffer.
height	the height of the buffer.
pal	the palette to use.

Implemented in Blitter_8bppBase, Blitter_40bppAnim, Blitter_32bppSimple, Blitter_32bppAnim, and Blitter_Null.

◆ DrawLine()

virtual void Blitter::DrawLine	(	void *	video,
		int	x,
		int	y,
		int	x2,
		int	y2,
		int	screen_width,
		int	screen_height,
		uint8_t	colour,
		int	width,
		int	dash = `0`
	)

pure virtual

Draw a line with a given colour.

Parameters

video	The destination pointer (video-buffer).
x	The x coordinate from where the line starts.
y	The y coordinate from where the line starts.
x2	The x coordinate to where the line goes.
y2	The y coordinate to where the lines goes.
screen_width	The width of the screen you are drawing in (to avoid buffer-overflows).
screen_height	The height of the screen you are drawing in (to avoid buffer-overflows).
colour	A 8bpp mapping colour.
width	Line width.
dash	Length of dashes for dashed lines. 0 means solid line.

Implemented in Blitter_8bppBase, Blitter_40bppAnim, Blitter_32bppBase, Blitter_32bppAnim, and Blitter_Null.

◆ DrawRect()

virtual void Blitter::DrawRect	(	void *	video,
		int	width,
		int	height,
		uint8_t	colour
	)

pure virtual

Make a single horizontal line in a single colour on the video-buffer.

Parameters

video	The destination pointer (video-buffer).
width	The length of the line.
height	The height of the line.
colour	A 8bpp mapping colour.

Implemented in Blitter_8bppBase, Blitter_40bppAnim, Blitter_32bppBase, Blitter_32bppAnim, and Blitter_Null.

◆ GetScreenDepth()

virtual uint8_t Blitter::GetScreenDepth ( )

pure virtual

Get the screen depth this blitter works for.

This is either: 8, 16, 24 or 32.

Implemented in Blitter_Null, Blitter_8bppBase, and Blitter_32bppBase.

Referenced by VideoDriver_SDL_Default::AllocateBackingStore(), VideoDriver_Win32GDI::AllocateBackingStore(), DrawSpriteToRgbaBuffer(), Is32BppSupported(), and VideoDriver_Dedicated::Start().

◆ MoveTo()

virtual void* Blitter::MoveTo	(	void *	video,
		int	x,
		int	y
	)

pure virtual

Move the destination pointer the requested amount x and y, keeping in mind any pitch and bpp of the renderer.

Parameters

video	The destination pointer (video-buffer) to scroll.
x	How much you want to scroll to the right.
y	How much you want to scroll to the bottom.

Returns: A new destination pointer moved the the requested place.

Implemented in Blitter_8bppBase, Blitter_32bppBase, and Blitter_Null.

Referenced by SmallMapWindow::DrawSmallMapColumn().

◆ PaletteAnimate()

virtual void Blitter::PaletteAnimate ( const Palette & palette )

pure virtual

Called when the 8bpp palette is changed; you should redraw all pixels on the screen that are equal to the 8bpp palette indexes 'first_dirty' to 'first_dirty + count_dirty'.

Parameters

palette The new palette.

Implemented in Blitter_8bppBase, Blitter_32bppBase, Blitter_32bppAnim, and Blitter_Null.

Referenced by VideoDriver_SDL_Default::Paint(), VideoDriver_SDL_OpenGL::Paint(), and VideoDriver_Win32GDI::Paint().

◆ ScrollBuffer()

virtual void Blitter::ScrollBuffer	(	void *	video,
		int &	left,
		int &	top,
		int &	width,
		int &	height,
		int	scroll_x,
		int	scroll_y
	)

pure virtual

Scroll the videobuffer some 'x' and 'y' value.

Parameters

video	The buffer to scroll into.
left	The left value of the screen to scroll.
top	The top value of the screen to scroll.
width	The width of the screen to scroll.
height	The height of the screen to scroll.
scroll_x	How much to scroll in X.
scroll_y	How much to scroll in Y.

Implemented in Blitter_8bppBase, Blitter_40bppAnim, Blitter_32bppBase, Blitter_32bppAnim, and Blitter_Null.

◆ SetPixel()

virtual void Blitter::SetPixel	(	void *	video,
		int	x,
		int	y,
		uint8_t	colour
	)

pure virtual

Draw a pixel with a given colour on the video-buffer.

Parameters

video	The destination pointer (video-buffer).
x	The x position within video-buffer.
y	The y position within video-buffer.
colour	A 8bpp mapping colour.

Implemented in Blitter_8bppBase, Blitter_40bppAnim, Blitter_32bppBase, Blitter_32bppAnim, and Blitter_Null.

◆ UsePaletteAnimation()

virtual Blitter::PaletteAnimation Blitter::UsePaletteAnimation ( )

pure virtual

Check if the blitter uses palette animation at all.

Returns: True if it uses palette animation.

Implemented in Blitter_Null, Blitter_8bppBase, Blitter_40bppAnim, Blitter_32bppBase, and Blitter_32bppAnim.

Referenced by VideoDriver_SDL::CheckPaletteAnim(), VideoDriver_SDL_Default::Paint(), VideoDriver_SDL_OpenGL::Paint(), and VideoDriver_Win32GDI::Paint().

The documentation for this class was generated from the following files:

src/blitter/base.hpp
src/blitter/common.hpp

Data Structures

Public Types

Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ PaletteAnimation

Member Function Documentation

◆ BufferSize()

◆ CopyFromBuffer()

◆ CopyImageToBuffer()

◆ CopyToBuffer()

◆ DrawColourMappingRect()

◆ DrawLine()

◆ DrawRect()

◆ GetScreenDepth()

◆ MoveTo()

◆ PaletteAnimate()

◆ ScrollBuffer()

◆ SetPixel()

◆ UsePaletteAnimation()