gfx_layout_icu.cpp File Reference

Handling of laying out with ICU / Harfbuzz. More...

#include "stdafx.h"
#include "gfx_layout_icu.h"
#include "debug.h"
#include "strings_func.h"
#include "language.h"
#include "table/control_codes.h"
#include "zoom_func.h"
#include "3rdparty/icu/scriptrun.h"
#include <unicode/ubidi.h>
#include <unicode/brkiter.h>
#include <hb.h>
#include <hb-ft.h>
#include "safeguards.h"

Go to the source code of this file.

Data Structures
class	ICURun
	Helper class to store the information of all the runs of a paragraph in. More...
class	ICUParagraphLayout
	Wrapper for doing layouts with ICU. More...
class	ICUParagraphLayout::ICUVisualRun
	Visual run contains data about the bit of text with the same font. More...
class	ICUParagraphLayout::ICULine
	A single line worth of VisualRuns. More...

Functions
std::vector< ICURun >	ItemizeBidi (UChar *buff, size_t length)
	Itemize the string into runs per embedding level.
std::vector< ICURun >	ItemizeScript (UChar *buff, size_t length, std::vector< ICURun > &runs_current)
	Itemize the string into runs per script, based on the previous created runs.
std::vector< ICURun >	ItemizeStyle (std::vector< ICURun > &runs_current, FontMap &font_mapping)
	Itemize the string into runs per style, based on the previous created runs.

Variables
constexpr float	FONT_SCALE = 64.0
	HarfBuzz FreeType integration sets the font scaling, which is always in 1/64th of a pixel.

Detailed Description

Handling of laying out with ICU / Harfbuzz.

Definition in file gfx_layout_icu.cpp.

Function Documentation

ItemizeBidi()

std::vector< ICURun > ItemizeBidi	(	UChar *	buff,
		size_t	length
	)

Itemize the string into runs per embedding level.

Later on, based on the levels, we can deduce the order of a subset of runs.

Parameters

buff	The string to itemize.
length	The length of the string.

Returns

The runs.

Definition at line 250 of file gfx_layout_icu.cpp.

References _current_text_dir, Debug, and TD_RTL.

ItemizeScript()

std::vector< ICURun > ItemizeScript	(	UChar *	buff,
		size_t	length,
		std::vector< ICURun > &	runs_current
	)

Itemize the string into runs per script, based on the previous created runs.

Basically, this always returns the same or more runs than given.

Parameters

buff	The string to itemize.
length	The length of the string.
runs_current	The current runs.

Returns

The runs.

Definition at line 302 of file gfx_layout_icu.cpp.

ItemizeStyle()

std::vector< ICURun > ItemizeStyle	(	std::vector< ICURun > &	runs_current,
		FontMap &	font_mapping
	)

Itemize the string into runs per style, based on the previous created runs.

Basically, this always returns the same or more runs than given.

Parameters

runs_current	The current runs.
font_mapping	The font mapping.

Returns

The runs.

Definition at line 335 of file gfx_layout_icu.cpp.

Variable Documentation

FONT_SCALE

constexpr float FONT_SCALE = 64.0

constexpr

HarfBuzz FreeType integration sets the font scaling, which is always in 1/64th of a pixel.

Definition at line 30 of file gfx_layout_icu.cpp.

Referenced by ICURun::Shape().