OpenTTD Source 20241224-master-gf74b0cf984
Blitter_32bppBase Class Reference

Base for all 32bpp blitters. More...

#include <32bpp_base.hpp>

Inheritance diagram for Blitter_32bppBase:
Blitter SpriteEncoder Blitter_32bppSimple Blitter_32bppOptimized Blitter_32bppAnim Blitter_40bppAnim

Public Member Functions

uint8_t GetScreenDepth () override
 Get the screen depth this blitter works for.
 
void * MoveTo (void *video, int x, int y) override
 Move the destination pointer the requested amount x and y, keeping in mind any pitch and bpp of the renderer.
 
void SetPixel (void *video, int x, int y, uint8_t colour) override
 Draw a pixel with a given colour on the video-buffer.
 
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) override
 Draw a line with a given colour.
 
void DrawRect (void *video, int width, int height, uint8_t colour) override
 Make a single horizontal line in a single colour on the video-buffer.
 
void CopyFromBuffer (void *video, const void *src, int width, int height) override
 Copy from a buffer to the screen.
 
void CopyToBuffer (const void *video, void *dst, int width, int height) override
 Copy from the screen to a buffer.
 
void CopyImageToBuffer (const void *video, void *dst, int width, int height, int dst_pitch) override
 Copy from the screen to a buffer in a palette format for 8bpp and RGBA format for 32bpp.
 
void ScrollBuffer (void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) override
 Scroll the videobuffer some 'x' and 'y' value.
 
size_t BufferSize (uint width, uint height) override
 Calculate how much memory there is needed for an image of this size in the video-buffer.
 
void PaletteAnimate (const Palette &palette) override
 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'.
 
Blitter::PaletteAnimation UsePaletteAnimation () override
 Check if the blitter uses palette animation at all.
 
- Public Member Functions inherited from Blitter
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.
 
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 SpriteEncode (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.
 

Static Public Member Functions

static Colour LookupColourInPalette (uint index)
 Look up the colour in the current palette.
 
static Colour ComposeColourRGBANoCheck (uint r, uint g, uint b, uint a, Colour current)
 Compose a colour based on RGBA values and the current pixel value.
 
static Colour ComposeColourRGBA (uint r, uint g, uint b, uint a, Colour current)
 Compose a colour based on RGBA values and the current pixel value.
 
static Colour ComposeColourPANoCheck (Colour colour, uint a, Colour current)
 Compose a colour based on Pixel value, alpha value, and the current pixel value.
 
static Colour ComposeColourPA (Colour colour, uint a, Colour current)
 Compose a colour based on Pixel value, alpha value, and the current pixel value.
 
static Colour MakeTransparent (Colour colour, uint nom, uint denom=256)
 Make a pixel looks like it is transparent.
 
static uint8_t MakeDark (uint8_t r, uint8_t g, uint8_t b)
 Make a colour dark grey, for specialized 32bpp remapping.
 
static Colour MakeDark (Colour colour)
 Make a colour dark grey, for specialized 32bpp remapping.
 
static Colour MakeGrey (Colour colour)
 Make a colour grey - based.
 
static Colour ReallyAdjustBrightness (Colour colour, uint8_t brightness)
 
static Colour AdjustBrightness (Colour colour, uint8_t brightness)
 
static uint8_t GetColourBrightness (Colour colour)
 

Static Public Attributes

static const int DEFAULT_BRIGHTNESS = 128
 

Additional Inherited Members

- Public Types inherited from Blitter
enum  PaletteAnimation { PALETTE_ANIMATION_NONE , PALETTE_ANIMATION_VIDEO_BACKEND , PALETTE_ANIMATION_BLITTER }
 Types of palette animation. More...
 

Detailed Description

Base for all 32bpp blitters.

Definition at line 19 of file 32bpp_base.hpp.

Member Function Documentation

◆ AdjustBrightness()

static Colour Blitter_32bppBase::AdjustBrightness ( Colour  colour,
uint8_t  brightness 
)
inlinestatic

Definition at line 161 of file 32bpp_base.hpp.

◆ BufferSize()

size_t Blitter_32bppBase::BufferSize ( uint  width,
uint  height 
)
overridevirtual

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

Parameters
widthThe width of the buffer-to-be.
heightThe height of the buffer-to-be.
Returns
The size needed for the buffer.

Implements Blitter.

Reimplemented in Blitter_40bppAnim.

Definition at line 143 of file 32bpp_base.cpp.

◆ ComposeColourPA()

static Colour Blitter_32bppBase::ComposeColourPA ( Colour  colour,
uint  a,
Colour  current 
)
inlinestatic

Compose a colour based on Pixel value, alpha value, and the current pixel value.

Handles fully transparent and solid pixels in a special (faster) way.

Definition at line 86 of file 32bpp_base.hpp.

References ComposeColourPANoCheck().

Referenced by Blitter_32bppSimple::Draw().

◆ ComposeColourPANoCheck()

static Colour Blitter_32bppBase::ComposeColourPANoCheck ( Colour  colour,
uint  a,
Colour  current 
)
inlinestatic

Compose a colour based on Pixel value, alpha value, and the current pixel value.

Definition at line 73 of file 32bpp_base.hpp.

References Colour::b, and ComposeColourRGBANoCheck().

Referenced by ComposeColourPA(), Blitter_32bppOptimized::Draw(), and Blitter_40bppAnim::Draw().

◆ ComposeColourRGBA()

static Colour Blitter_32bppBase::ComposeColourRGBA ( uint  r,
uint  g,
uint  b,
uint  a,
Colour  current 
)
inlinestatic

Compose a colour based on RGBA values and the current pixel value.

Handles fully transparent and solid pixels in a special (faster) way.

Definition at line 62 of file 32bpp_base.hpp.

References ComposeColourRGBANoCheck().

Referenced by Blitter_32bppSimple::Draw(), and Blitter_32bppOptimized::Draw().

◆ ComposeColourRGBANoCheck()

static Colour Blitter_32bppBase::ComposeColourRGBANoCheck ( uint  r,
uint  g,
uint  b,
uint  a,
Colour  current 
)
inlinestatic

Compose a colour based on RGBA values and the current pixel value.

Definition at line 45 of file 32bpp_base.hpp.

References Colour::b.

Referenced by ComposeColourPANoCheck(), ComposeColourRGBA(), Blitter_32bppOptimized::Draw(), and Blitter_40bppAnim::Draw().

◆ CopyFromBuffer()

void Blitter_32bppBase::CopyFromBuffer ( void *  video,
const void *  src,
int  width,
int  height 
)
overridevirtual

Copy from a buffer to the screen.

Parameters
videoThe destination pointer (video-buffer).
srcThe buffer from which the data will be read.
widthThe width of the buffer.
heightThe 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!

Implements Blitter.

Reimplemented in Blitter_40bppAnim.

Definition at line 48 of file 32bpp_base.cpp.

◆ CopyImageToBuffer()

void Blitter_32bppBase::CopyImageToBuffer ( const void *  video,
void *  dst,
int  width,
int  height,
int  dst_pitch 
)
overridevirtual

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

Parameters
videoThe destination pointer (video-buffer).
dstThe buffer in which the data will be stored.
widthThe width of the buffer.
heightThe height of the buffer.
dst_pitchThe pitch (byte per line) of the destination buffer.

Implements Blitter.

Reimplemented in Blitter_40bppAnim.

Definition at line 72 of file 32bpp_base.cpp.

Referenced by Blitter_40bppAnim::CopyImageToBuffer().

◆ CopyToBuffer()

void Blitter_32bppBase::CopyToBuffer ( const void *  video,
void *  dst,
int  width,
int  height 
)
overridevirtual

Copy from the screen to a buffer.

Parameters
videoThe destination pointer (video-buffer).
dstThe buffer in which the data will be stored.
widthThe width of the buffer.
heightThe 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!

Implements Blitter.

Reimplemented in Blitter_40bppAnim.

Definition at line 60 of file 32bpp_base.cpp.

◆ DrawLine()

void Blitter_32bppBase::DrawLine ( void *  video,
int  x,
int  y,
int  x2,
int  y2,
int  screen_width,
int  screen_height,
uint8_t  colour,
int  width,
int  dash 
)
overridevirtual

Draw a line with a given colour.

Parameters
videoThe destination pointer (video-buffer).
xThe x coordinate from where the line starts.
yThe y coordinate from where the line starts.
x2The x coordinate to where the line goes.
y2The y coordinate to where the lines goes.
screen_widthThe width of the screen you are drawing in (to avoid buffer-overflows).
screen_heightThe height of the screen you are drawing in (to avoid buffer-overflows).
colourA 8bpp mapping colour.
widthLine width.
dashLength of dashes for dashed lines. 0 means solid line.

Implements Blitter.

Reimplemented in Blitter_40bppAnim.

Definition at line 26 of file 32bpp_base.cpp.

References LookupColourInPalette().

Referenced by Blitter_40bppAnim::DrawLine().

◆ DrawRect()

void Blitter_32bppBase::DrawRect ( void *  video,
int  width,
int  height,
uint8_t  colour 
)
overridevirtual

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

Parameters
videoThe destination pointer (video-buffer).
widthThe length of the line.
heightThe height of the line.
colourA 8bpp mapping colour.

Implements Blitter.

Reimplemented in Blitter_40bppAnim.

Definition at line 34 of file 32bpp_base.cpp.

References LookupColourInPalette().

Referenced by Blitter_32bppAnim::DrawRect(), and Blitter_40bppAnim::DrawRect().

◆ GetColourBrightness()

static uint8_t Blitter_32bppBase::GetColourBrightness ( Colour  colour)
inlinestatic

Definition at line 169 of file 32bpp_base.hpp.

◆ GetScreenDepth()

uint8_t Blitter_32bppBase::GetScreenDepth ( )
inlineoverridevirtual

Get the screen depth this blitter works for.

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

Implements Blitter.

Definition at line 21 of file 32bpp_base.hpp.

◆ LookupColourInPalette()

static Colour Blitter_32bppBase::LookupColourInPalette ( uint  index)
inlinestatic

Look up the colour in the current palette.

Definition at line 37 of file 32bpp_base.hpp.

References _cur_palette, and Palette::palette.

Referenced by Blitter_32bppSimple::Draw(), Blitter_32bppOptimized::Draw(), Blitter_40bppAnim::Draw(), DrawLine(), DrawRect(), Blitter_32bppSimple::Encode(), and SetPixel().

◆ MakeDark() [1/2]

static Colour Blitter_32bppBase::MakeDark ( Colour  colour)
inlinestatic

Make a colour dark grey, for specialized 32bpp remapping.

Parameters
colourthe colour to make dark.
Returns
the new colour, now darker.

Definition at line 131 of file 32bpp_base.hpp.

References Colour::b, and MakeDark().

◆ MakeDark() [2/2]

static uint8_t Blitter_32bppBase::MakeDark ( uint8_t  r,
uint8_t  g,
uint8_t  b 
)
inlinestatic

Make a colour dark grey, for specialized 32bpp remapping.

Parameters
rred component
ggreen component
bblue component
Returns
the brightness value of the new colour, now dark grey.

Definition at line 120 of file 32bpp_base.hpp.

Referenced by Blitter_32bppSimple::Draw(), Blitter_32bppOptimized::Draw(), Blitter_40bppAnim::Draw(), and MakeDark().

◆ MakeGrey()

static Colour Blitter_32bppBase::MakeGrey ( Colour  colour)
inlinestatic

Make a colour grey - based.

Parameters
colourthe colour to make grey.
Returns
the new colour, now grey.

Definition at line 143 of file 32bpp_base.hpp.

References Colour::b.

Referenced by Blitter_32bppAnim::DrawColourMappingRect(), Blitter_32bppSimple::DrawColourMappingRect(), and Blitter_40bppAnim::DrawColourMappingRect().

◆ MakeTransparent()

static Colour Blitter_32bppBase::MakeTransparent ( Colour  colour,
uint  nom,
uint  denom = 256 
)
inlinestatic

Make a pixel looks like it is transparent.

Parameters
colourthe colour already on the screen.
nomthe amount of transparency, nominator, makes colour lighter.
denomdenominator, makes colour darker.
Returns
the new colour for the screen.

Definition at line 104 of file 32bpp_base.hpp.

References Colour::b.

Referenced by Blitter_32bppSimple::Draw(), Blitter_32bppOptimized::Draw(), Blitter_40bppAnim::Draw(), Blitter_32bppAnim::DrawColourMappingRect(), Blitter_32bppSimple::DrawColourMappingRect(), and Blitter_40bppAnim::DrawColourMappingRect().

◆ MoveTo()

void * Blitter_32bppBase::MoveTo ( void *  video,
int  x,
int  y 
)
overridevirtual

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

Parameters
videoThe destination pointer (video-buffer) to scroll.
xHow much you want to scroll to the right.
yHow much you want to scroll to the bottom.
Returns
A new destination pointer moved the the requested place.

Implements Blitter.

Definition at line 16 of file 32bpp_base.cpp.

◆ PaletteAnimate()

void Blitter_32bppBase::PaletteAnimate ( const Palette palette)
overridevirtual

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
paletteThe new palette.

Implements Blitter.

Definition at line 148 of file 32bpp_base.cpp.

◆ ReallyAdjustBrightness()

Colour Blitter_32bppBase::ReallyAdjustBrightness ( Colour  colour,
uint8_t  brightness 
)
static

Definition at line 153 of file 32bpp_base.cpp.

◆ ScrollBuffer()

void Blitter_32bppBase::ScrollBuffer ( void *  video,
int &  left,
int &  top,
int &  width,
int &  height,
int  scroll_x,
int  scroll_y 
)
overridevirtual

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

Parameters
videoThe buffer to scroll into.
leftThe left value of the screen to scroll.
topThe top value of the screen to scroll.
widthThe width of the screen to scroll.
heightThe height of the screen to scroll.
scroll_xHow much to scroll in X.
scroll_yHow much to scroll in Y.

Implements Blitter.

Reimplemented in Blitter_40bppAnim.

Definition at line 84 of file 32bpp_base.cpp.

Referenced by Blitter_32bppAnim::ScrollBuffer(), and Blitter_40bppAnim::ScrollBuffer().

◆ SetPixel()

void Blitter_32bppBase::SetPixel ( void *  video,
int  x,
int  y,
uint8_t  colour 
)
overridevirtual

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

Parameters
videoThe destination pointer (video-buffer).
xThe x position within video-buffer.
yThe y position within video-buffer.
colourA 8bpp mapping colour.

Implements Blitter.

Reimplemented in Blitter_40bppAnim.

Definition at line 21 of file 32bpp_base.cpp.

References LookupColourInPalette().

Referenced by Blitter_40bppAnim::SetPixel().

◆ UsePaletteAnimation()

Blitter::PaletteAnimation Blitter_32bppBase::UsePaletteAnimation ( )
overridevirtual

Check if the blitter uses palette animation at all.

Returns
True if it uses palette animation.

Implements Blitter.

Reimplemented in Blitter_40bppAnim.

Definition at line 183 of file 32bpp_base.cpp.

References Blitter::PALETTE_ANIMATION_NONE.

Field Documentation

◆ DEFAULT_BRIGHTNESS

const int Blitter_32bppBase::DEFAULT_BRIGHTNESS = 128
static

Definition at line 157 of file 32bpp_base.hpp.


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