Layouter Class Reference

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

#include <gfx_layout.h>

Inheritance diagram for Layouter:

Data Structures
struct	LineCacheCompare
	Comparator for std::map. More...
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, TextColour colour=TC_FROMSTRING, FontSize fontsize=FS_NORMAL)
	Create a new layouter. More...
Dimension	GetBounds ()
	Get the boundaries of this paragraph. More...
Point	GetCharPosition (std::string_view::const_iterator ch) const
	Get the position of a character in the layout. More...
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. More...

Static Public Member Functions
static Font *	GetFont (FontSize size, TextColour colour)
	Get a static font instance.
static void	Initialize ()
	Perform initialization of layout engine.
static void	ResetFontCache (FontSize size)
	Reset cached font information. More...
static void	ResetLineCache ()
	Clear line cache.
static void	ReduceLineCache ()
	Reduce the size of linecache if necessary to prevent infinite growth.

Private Types
typedef std::map< LineCacheKey, LineCacheItem, LineCacheCompare >	LineCache
using	FontColourMap = std::map< TextColour, std::unique_ptr< Font > >

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

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

Static Private Attributes
static LineCache *	linecache
	Cache of ParagraphLayout lines.
static FontColourMap	fonts [FS_END]
	Cache of Font instances.

Detailed Description

The layouter performs all the layout work.

It also accounts for the memory allocations and frees.

Definition at line 125 of file gfx_layout.h.

Constructor & Destructor Documentation

Layouter()

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

Create a new layouter.

Parameters

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

Definition at line 130 of file gfx_layout.cpp.

References 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 199 of file gfx_layout.cpp.

Referenced by DrawStringMultiLine().

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 373 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 288 of file gfx_layout.cpp.

Referenced by TextfileWindow::CheckHyperlinkClick().

GetCharPosition()

Point 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 228 of file gfx_layout.cpp.

ResetFontCache()

void Layouter::ResetFontCache ( FontSize  size )

static

Reset cached font information.

Parameters

size	Font size to reset.

Definition at line 351 of file gfx_layout.cpp.

References fonts, and ResetLineCache().

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

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

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