Layouter Class Reference

The layouter performs all the layout work. More...

#include <gfx_layout.h>

Inheritance diagram for Layouter:

Data Structures
struct	LineCacheEqualTo
struct	LineCacheHash
struct	LineCacheItem
	Item in the linecache. More...
struct	LineCacheKey
	Key into the linecache. More...
struct	LineCacheQuery

Public Member Functions
	Layouter (std::string_view str, int maxw=INT32_MAX, FontSize fontsize=FS_NORMAL)
	Create a new layouter.
Dimension	GetBounds ()
	Get the boundaries of this paragraph.
ParagraphLayouter::Position	GetCharPosition (std::string_view::const_iterator ch) const
	Get the position of a character in the layout.
ptrdiff_t	GetCharAtPosition (int x, size_t line_index) const
	Get the character that is at a pixel position in the first line of the layouted text.

Static Public Member Functions
static void	Initialize ()
	Perform initialization of layout engine.
static void	ResetFontCache (FontSize fs)
	Reset cached font information.
static void	ResetLineCache ()
	Clear line cache.

Private Types
using	LineCache = LRUCache< LineCacheKey, LineCacheItem, LineCacheHash, LineCacheEqualTo >

Static Private Member Functions
static LineCacheItem &	GetCachedParagraphLayout (std::string_view str, const FontState &state)
	Get reference to cache item.

Private Attributes
std::string_view	string
	Pointer to the original string.

Static Private Attributes
static std::unique_ptr< LineCache >	linecache
	Cache of ParagraphLayout lines.

Friends
struct	std::hash< Layouter::LineCacheQuery >

Detailed Description

The layouter performs all the layout work.

It also accounts for the memory allocations and frees.

Definition at line 161 of file gfx_layout.h.

Member Typedef Documentation

LineCache

using Layouter::LineCache = LRUCache<LineCacheKey, LineCacheItem, LineCacheHash, LineCacheEqualTo>

private

Definition at line 204 of file gfx_layout.h.

Constructor & Destructor Documentation

Layouter()

Layouter::Layouter	(	std::string_view	str,
		int	maxw = INT32_MAX,
		FontSize	fontsize = FS_NORMAL
	)

Create a new layouter.

Parameters

str	The string to create the layout for.
maxw	The maximum width.
fontsize	The size of font to use.

Definition at line 196 of file gfx_layout.cpp.

References Layouter::LineCacheItem::cached_layout, Layouter::LineCacheItem::cached_width, GetCachedParagraphLayout(), Layouter::LineCacheItem::layout, and Layouter::LineCacheItem::state_after.

Member Function Documentation

GetBounds()

Dimension Layouter::GetBounds

(

)

Get the boundaries of this paragraph.

Returns

The boundaries.

Definition at line 275 of file gfx_layout.cpp.

Referenced by DrawStringMultiLine(), GetStringBoundingBox(), and GetStringHeight().

GetCachedParagraphLayout()

Layouter::LineCacheItem & Layouter::GetCachedParagraphLayout ( std::string_view  str, const FontState &  state  )

staticprivate

Get reference to cache item.

If the item does not exist yet, it is default constructed.

Parameters

str	Source string of the line (including colour and font size codes).
state	State of the font at the beginning of the line.

Returns

Reference to cache item.

Definition at line 441 of file gfx_layout.cpp.

References linecache, Layouter::LineCacheKey::state_before, and Layouter::LineCacheKey::str.

Referenced by Layouter().

GetCharAtPosition()

ptrdiff_t Layouter::GetCharAtPosition	(	int	x,
		size_t	line_index
	)		const

Get the character that is at a pixel position in the first line of the layouted text.

Parameters

x	Position in the string.
line_index	Which line of the layout to search

Returns

String offset of the position (bytes) or -1 if no character is at the position.

Definition at line 370 of file gfx_layout.cpp.

References IsConsumedFormattingCode(), and IsInsideMM().

Referenced by GetCharAtPosition().

GetCharPosition()

ParagraphLayouter::Position Layouter::GetCharPosition

(

std::string_view::const_iterator

ch

)

const

Get the position of a character in the layout.

Parameters

ch	Character to get the position of. Must be an iterator of the string passed to the constructor.

Returns

Upper left corner of the character relative to the start of the string.

Note

Will only work right for single-line strings.

Definition at line 304 of file gfx_layout.cpp.

References _current_text_dir, Utf8View::GetIterAtByte(), IsConsumedFormattingCode(), and TD_LTR.

Referenced by GetCharPosInString().

Initialize()

void Layouter::Initialize ( )

static

Perform initialization of layout engine.

Definition at line 411 of file gfx_layout.cpp.

References ICUParagraphLayoutFactory::InitializeLayouter().

Referenced by ReadLanguagePack().

ResetFontCache()

void Layouter::ResetFontCache ( FontSize  fs )

static

Reset cached font information.

Definition at line 421 of file gfx_layout.cpp.

References MacOSResetScriptCache(), and ResetLineCache().

Referenced by SpriteFontCache::ClearFontCache(), TrueTypeFontCache::ClearFontCache(), and FontCache::LoadFontCaches().

ResetLineCache()

void Layouter::ResetLineCache ( )

static

Clear line cache.

Definition at line 464 of file gfx_layout.cpp.

References linecache.

Referenced by ResetFontCache().

Friends And Related Symbol Documentation

std::hash< Layouter::LineCacheQuery >

friend struct std::hash< Layouter::LineCacheQuery >

friend

Definition at line 162 of file gfx_layout.h.

Field Documentation

linecache

std::unique_ptr< Layouter::LineCache > Layouter::linecache

staticprivate

Cache of ParagraphLayout lines.

Definition at line 205 of file gfx_layout.h.

Referenced by GetCachedParagraphLayout(), and ResetLineCache().

string

std::string_view Layouter::string

private

Pointer to the original string.

Definition at line 162 of file gfx_layout.h.

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

• src/gfx_layout.h
• src/gfx_layout.cpp