unit.h File Reference

#include <libcss/types.h>

Go to the source code of this file.

Classes
struct	css_unit_ctx

Typedefs
typedef css_fixed(*	css_unit_len_measure) (void *pw, const css_computed_style *style, const css_unit unit)
typedef struct css_unit_ctx	css_unit_ctx

Functions
css_fixed	css_unit_font_size_len2pt (const css_computed_style *style, const css_unit_ctx *ctx, const css_fixed length, const css_unit unit)
css_fixed	css_unit_len2css_px (const css_computed_style *style, const css_unit_ctx *ctx, const css_fixed length, const css_unit unit)
css_fixed	css_unit_len2device_px (const css_computed_style *style, const css_unit_ctx *ctx, const css_fixed length, const css_unit unit)

Typedef Documentation

css_unit_ctx

typedef struct css_unit_ctx css_unit_ctx

LibCSS unit conversion context.

The client callback is optional. It is used for measuring "ch" (glyph '0' advance) and "ex" (height of the letter 'x') units. If a NULL pointer is given, LibCSS will use a fixed scaling of the "em" unit.

css_unit_len_measure

typedef css_fixed(* css_unit_len_measure) (void *pw, const css_computed_style *style, const css_unit unit)

Client callback for font measuring.

Parameters

[in]	pw	Client data.
[in]	style	Style to measure font for, or NULL.
[in]	unit	Either CSS_UNIT_EX, or CSS_UNIT_CH.

Returns

length in CSS pixels.

Function Documentation

css_unit_font_size_len2pt()

css_fixed css_unit_font_size_len2pt	(	const css_computed_style *	style,
		const css_unit_ctx *	ctx,
		const css_fixed	length,
		const css_unit	unit
	)

Convert a length to points (pt).

Parameters

[in]	style	Style to perform conversion for or NULL.
[in]	ctx	Length unit conversion context.
[in]	length	Length to convert.
[in]	unit	Current unit of length.

Returns

A length in points.

css_unit_len2css_px()

css_fixed css_unit_len2css_px	(	const css_computed_style *	style,
		const css_unit_ctx *	ctx,
		const css_fixed	length,
		const css_unit	unit
	)

Convert a length to CSS pixels.

Parameters

[in]	style	Style to perform conversion for or NULL.
[in]	ctx	Length unit conversion context.
[in]	length	Length to convert.
[in]	unit	Current unit of length.

Returns

A length in CSS pixels.

css_unit_len2device_px()

css_fixed css_unit_len2device_px	(	const css_computed_style *	style,
		const css_unit_ctx *	ctx,
		const css_fixed	length,
		const css_unit	unit
	)

Convert a length to device pixels.

Parameters

[in]	style	Style to perform conversion for or NULL.
[in]	ctx	Length unit conversion context.
[in]	length	Length to convert.
[in]	unit	Current unit of length.

Returns

A length in device pixels.