Functions to cache sprites in memory. More...

#include "gfx_type.h"
#include "spriteloader/spriteloader.hpp"

Data Structures
struct	Sprite
	Data structure describing a sprite. More...

class	SimpleSpriteAllocator
	SpriteAllocate that uses malloc to allocate memory. More...

class	UniquePtrSpriteAllocator
	SpriteAllocator that allocates memory via a unique_ptr array. More...

Enumerations
enum	SpriteCacheCtrlFlags { SCCF_ALLOW_ZOOM_MIN_1X_PAL = 0 , SCCF_ALLOW_ZOOM_MIN_1X_32BPP = 1 , SCCF_ALLOW_ZOOM_MIN_2X_PAL = 2 , SCCF_ALLOW_ZOOM_MIN_2X_32BPP = 3 }

Functions
void *	GetRawSprite (SpriteID sprite, SpriteType type, SpriteAllocator allocator=nullptr, SpriteEncoder encoder=nullptr)
	Reads a sprite (from disk or sprite cache). More...

bool	SpriteExists (SpriteID sprite)

SpriteType	GetSpriteType (SpriteID sprite)
	Get the sprite type of a given sprite. More...

SpriteFile *	GetOriginFile (SpriteID sprite)
	Get the SpriteFile of a given sprite. More...

uint32_t	GetSpriteLocalID (SpriteID sprite)
	Get the GRF-local sprite id of a given sprite. More...

uint	GetSpriteCountForFile (const std::string &filename, SpriteID begin, SpriteID end)
	Count the sprites which originate from a specific file in a range of SpriteIDs. More...

uint	GetMaxSpriteID ()
	Get a reasonable (upper bound) estimate of the maximum SpriteID used in OpenTTD; there will be no sprites with a higher SpriteID, although there might be up to roughly a thousand unused SpriteIDs below this number. More...

const Sprite *	GetSprite (SpriteID sprite, SpriteType type)

const uint8_t *	GetNonSprite (SpriteID sprite, SpriteType type)

void	GfxInitSpriteMem ()

void	GfxClearSpriteCache ()
	Remove all encoded sprites from the sprite cache without discarding sprite location information.

void	GfxClearFontSpriteCache ()
	Remove all encoded font sprites from the sprite cache without discarding sprite location information.

void	IncreaseSpriteLRU ()

SpriteFile &	OpenCachedSpriteFile (const std::string &filename, Subdirectory subdir, bool palette_remap)
	Open/get the SpriteFile that is cached for use in the sprite cache. More...

std::span< const std::unique_ptr< SpriteFile > >	GetCachedSpriteFiles ()
	Get the list of cached SpriteFiles. More...

void	ReadGRFSpriteOffsets (SpriteFile &file)
	Parse the sprite section of GRFs. More...

size_t	GetGRFSpriteOffset (uint32_t id)
	Get the file offset for a specific sprite in the sprite section of a GRF. More...

bool	LoadNextSprite (SpriteID load_index, SpriteFile &file, uint file_sprite_id)
	Load a real or recolour sprite. More...

bool	SkipSpriteData (SpriteFile &file, uint8_t type, uint16_t num)
	Skip the given amount of sprite graphics data. More...

void	DupSprite (SpriteID old_spr, SpriteID new_spr)

Variables
uint	_sprite_cache_size

Detailed Description

Functions to cache sprites in memory.

Definition in file spritecache.h.

Enumeration Type Documentation

◆ SpriteCacheCtrlFlags

enum SpriteCacheCtrlFlags

Enumerator
SCCF_ALLOW_ZOOM_MIN_1X_PAL	Allow use of sprite min zoom setting at 1x in palette mode.
SCCF_ALLOW_ZOOM_MIN_1X_32BPP	Allow use of sprite min zoom setting at 1x in 32bpp mode.
SCCF_ALLOW_ZOOM_MIN_2X_PAL	Allow use of sprite min zoom setting at 2x in palette mode.
SCCF_ALLOW_ZOOM_MIN_2X_32BPP	Allow use of sprite min zoom setting at 2x in 32bpp mode.

Definition at line 25 of file spritecache.h.

Function Documentation

◆ GetCachedSpriteFiles()

std::span<const std::unique_ptr<SpriteFile> > GetCachedSpriteFiles ( )

Get the list of cached SpriteFiles.

Returns: Read-only list of cache SpriteFiles.

Definition at line 81 of file spritecache.cpp.

◆ GetGRFSpriteOffset()

size_t GetGRFSpriteOffset ( uint32_t id )

Get the file offset for a specific sprite in the sprite section of a GRF.

Parameters

id	ID of the sprite to look up.

Returns: Position of the sprite in the sprite section or SIZE_MAX if no such sprite is present.

Definition at line 553 of file spritecache.cpp.

References _grf_sprite_offsets.

◆ GetMaxSpriteID()

uint GetMaxSpriteID ( )

Get a reasonable (upper bound) estimate of the maximum SpriteID used in OpenTTD; there will be no sprites with a higher SpriteID, although there might be up to roughly a thousand unused SpriteIDs below this number.

Note: It's actually the number of spritecache items.

Returns: maximum SpriteID

Definition at line 220 of file spritecache.cpp.

Referenced by UpdateCursorSize().

◆ GetOriginFile()

SpriteFile* GetOriginFile ( SpriteID sprite )

Get the SpriteFile of a given sprite.

Parameters

sprite The sprite to look at.

Returns: The SpriteFile.

Definition at line 170 of file spritecache.cpp.

◆ GetRawSprite()

void* GetRawSprite	(	SpriteID	sprite,
		SpriteType	type,
		SpriteAllocator *	allocator,
		SpriteEncoder *	encoder
	)

Reads a sprite (from disk or sprite cache).

If the sprite is not available or of wrong type, a fallback sprite is returned.

Parameters

sprite	Sprite to read.
type	Expected sprite type.
allocator	Allocator function to use. Set to nullptr to use the usual sprite cache.
encoder	Sprite encoder to use. Set to nullptr to use the currently active blitter.

Returns: Sprite raw data

Definition at line 956 of file spritecache.cpp.

References MapGen.

Referenced by HandleInvalidSpriteRequest().

◆ GetSpriteCountForFile()

uint GetSpriteCountForFile	(	const std::string &	filename,
		SpriteID	begin,
		SpriteID	end
	)

Count the sprites which originate from a specific file in a range of SpriteIDs.

Parameters

file	The loaded SpriteFile.
begin	First sprite in range.
end	First sprite not in range.

Returns: Number of sprites.

Definition at line 194 of file spritecache.cpp.

References GetCachedSpriteFileByName().

◆ GetSpriteLocalID()

uint32_t GetSpriteLocalID ( SpriteID sprite )

Get the GRF-local sprite id of a given sprite.

Parameters

sprite The sprite to look at.

Returns: The GRF-local sprite id.

Definition at line 181 of file spritecache.cpp.

◆ GetSpriteType()

SpriteType GetSpriteType ( SpriteID sprite )

Get the sprite type of a given sprite.

Parameters

sprite The sprite to look at.

Returns: the type of sprite.

Definition at line 159 of file spritecache.cpp.

◆ LoadNextSprite()

bool LoadNextSprite	(	SpriteID	load_index,
		SpriteFile &	file,
		uint	file_sprite_id
	)

Load a real or recolour sprite.

Parameters

load_index	Global sprite index.
file	GRF to load from.
file_sprite_id	Sprite number in the GRF.
container_version	Container version of the GRF.

Returns: True if a valid sprite was loaded, false on any error.

Definition at line 618 of file spritecache.cpp.

References _grf_sprite_offsets, SpriteFile::GetContainerVersion(), RandomAccessFile::GetPos(), Invalid, MAX_SPRITES, Normal, RandomAccessFile::ReadByte(), RandomAccessFile::ReadDword(), ReadRecolourSprite(), RandomAccessFile::ReadWord(), Recolour, RandomAccessFile::SkipBytes(), and SkipSpriteData().

◆ OpenCachedSpriteFile()

SpriteFile& OpenCachedSpriteFile	(	const std::string &	filename,
		Subdirectory	subdir,
		bool	palette_remap
	)

Open/get the SpriteFile that is cached for use in the sprite cache.

Parameters

filename	Name of the file at the disk.
subdir	The sub directory to search this file in.
palette_remap	Whether a palette remap needs to be performed for this file.

Returns: The reference to the SpriteCache.

Definition at line 93 of file spritecache.cpp.

References GetCachedSpriteFileByName().

Referenced by LoadGrfFile(), and LoadGrfFileIndexed().

◆ ReadGRFSpriteOffsets()

void ReadGRFSpriteOffsets ( SpriteFile & file )

Parse the sprite section of GRFs.

Parameters

container_version Container version of the GRF we're currently processing.

Definition at line 562 of file spritecache.cpp.

References _grf_sprite_offsets, SpriteFile::GetContainerVersion(), RandomAccessFile::GetPos(), RandomAccessFile::ReadByte(), RandomAccessFile::ReadDword(), SCC_MASK, SCC_PAL, SCCF_ALLOW_ZOOM_MIN_1X_32BPP, SCCF_ALLOW_ZOOM_MIN_1X_PAL, SCCF_ALLOW_ZOOM_MIN_2X_32BPP, SCCF_ALLOW_ZOOM_MIN_2X_PAL, RandomAccessFile::SeekTo(), SetBit(), and RandomAccessFile::SkipBytes().

◆ SkipSpriteData()

bool SkipSpriteData	(	SpriteFile &	file,
		uint8_t	type,
		uint16_t	num
	)

Skip the given amount of sprite graphics data.

Parameters

type	the type of sprite (compressed etc)
num	the amount of sprites to skip

Returns: true if the data could be correctly skipped.

Definition at line 122 of file spritecache.cpp.

Referenced by LoadNextSprite().

Data Structures

Enumerations

Functions

Variables

Detailed Description

Enumeration Type Documentation

◆ SpriteCacheCtrlFlags

Function Documentation

◆ GetCachedSpriteFiles()

◆ GetGRFSpriteOffset()

◆ GetMaxSpriteID()

◆ GetOriginFile()

◆ GetRawSprite()

◆ GetSpriteCountForFile()

◆ GetSpriteLocalID()

◆ GetSpriteType()

◆ LoadNextSprite()

◆ OpenCachedSpriteFile()

◆ ReadGRFSpriteOffsets()

◆ SkipSpriteData()