font.c File Reference

RISC OS implementation of Font handling. More...

#include "utils/config.h"
#include <assert.h>
#include <string.h>
#include <oslib/wimp.h>
#include <oslib/wimpreadsysinfo.h>
#include "utils/nsoption.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/utils.h"
#include "netsurf/layout.h"
#include "netsurf/plot_style.h"
#include "riscos/gui.h"
#include "riscos/font.h"

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Functions
static void	nsfont_check_fonts (void)
	Check that at least Homerton.Medium is available. More...
static void	nsfont_check_option (char **option, const char *family, const char *fallback)
	Check that a font option is valid, and fix it if not. More...
void	nsfont_init (void)
	Initialize font handling. More...
const char *	nsfont_fallback_font (void)
	Retrieve the fallback font name. More...
static int	nsfont_list_cmp (const void *keyval, const void *datum)
	bsearch comparison routine More...
bool	nsfont_exists (const char *font_family)
	Check if a font family is available. More...
static nserror	ro_font_width (const plot_font_style_t *fstyle, const char *string, size_t length, int *width)
	Measure the width of a string. More...
static nserror	ro_font_position (const plot_font_style_t *fstyle, const char *string, size_t length, int x, size_t *char_offset, int *actual_x)
	Find the position in a string where an x coordinate falls. More...
static nserror	ro_font_split (const plot_font_style_t *fstyle, const char *string, size_t length, int x, size_t *char_offset, int *actual_x)
	Find where to split a string to make it fit a width. More...
bool	nsfont_paint (const plot_font_style_t *fstyle, const char *string, size_t length, int x, int y)
	Paint a string. More...
void	nsfont_read_style (const plot_font_style_t *fstyle, const char **font_family, unsigned int *font_size, rufl_style *font_style)
	Convert a font style to a font family, size and rufl_style. More...
static void	ro_gui_wimp_desktop_font (char *family, size_t family_size, int *psize, rufl_style *pstyle)
	Looks up the current desktop font and converts that to a family name, font size and style flags suitable for passing directly to rufl. More...
void	ro_gui_wimp_get_desktop_font (void)
	Retrieve the current desktop font family, size and style from the WindowManager in a form suitable for passing to rufl. More...

Variables
char	ro_gui_desktop_font_family [80]
	desktop font, size and style being used More...
int	ro_gui_desktop_font_size = 12
rufl_style	ro_gui_desktop_font_style = rufl_WEIGHT_400
bool	no_font_blending = false
static struct gui_layout_table	layout_table
struct gui_layout_table *	riscos_layout_table = &layout_table

Detailed Description

RISC OS implementation of Font handling.

The RUfl is used to handle and render fonts.

Definition in file font.c.

Function Documentation

nsfont_check_fonts()

static void nsfont_check_fonts ( void  )

static

Check that at least Homerton.Medium is available.

Definition at line 54 of file font.c.

References die(), messages_get(), and NSLOG.

Referenced by nsfont_init().

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nsfont_check_option()

static void nsfont_check_option ( char **  option, const char *  family, const char *  fallback  )

static

Check that a font option is valid, and fix it if not.

Parameters

option	pointer to option, as used by options.[ch]
family	font family to use if option is not set, or the set family is not available
fallback	font family to use if family is not available either

Definition at line 95 of file font.c.

References nsfont_exists().

Referenced by nsfont_init().

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nsfont_exists()

bool nsfont_exists

(

const char *

font_family

)

Check if a font family is available.

Parameters

font_family

name of font family

Returns

true if the family is available

Definition at line 199 of file font.c.

References nsfont_list_cmp().

Referenced by nsfont_check_option(), nsfont_fallback_font(), and ro_gui_options_fonts_default().

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nsfont_fallback_font()

const char * nsfont_fallback_font

(

void

)

Retrieve the fallback font name.

Returns

Fallback font name

Definition at line 165 of file font.c.

References nsfont_exists(), and NSLOG.

Referenced by nsfont_init(), and ro_gui_options_fonts_default().

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nsfont_init()

void nsfont_init

(

void

)

Initialize font handling.

Exits through die() on error.

Definition at line 116 of file font.c.

References die(), nsfont_check_fonts(), nsfont_check_option(), nsfont_fallback_font(), NSLOG, nsoption_charp, nsoption_int, nsoption_set_int, PLOT_FONT_FAMILY_CURSIVE, PLOT_FONT_FAMILY_FANTASY, PLOT_FONT_FAMILY_MONOSPACE, PLOT_FONT_FAMILY_SANS_SERIF, and PLOT_FONT_FAMILY_SERIF.

Referenced by gui_init().

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nsfont_list_cmp()

static int nsfont_list_cmp ( const void *  keyval, const void *  datum  )

static

bsearch comparison routine

Definition at line 185 of file font.c.

Referenced by nsfont_exists().

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nsfont_paint()

bool nsfont_paint	(	const plot_font_style_t *	fstyle,
		const char *	string,
		size_t	length,
		int	x,
		int	y
	)

Paint a string.

Render a string.

Parameters

fstyle	plot style for this text
string	UTF-8 string to measure
length	length of string
x	x coordinate
y	y coordinate

Returns

true on success, false on error and error reported

Definition at line 415 of file font.c.

References no_font_blending, nsfont_read_style(), NSLOG, and print_active.

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nsfont_read_style()

void nsfont_read_style	(	const plot_font_style_t *	fstyle,
		const char **	font_family,
		unsigned int *	font_size,
		rufl_style *	font_style
	)

Convert a font style to a font family, size and rufl_style.

Parameters

fstyle	plot style for this text
font_family	updated to font family
font_size	updated to font size
font_style	updated to font style

Definition at line 456 of file font.c.

References plot_font_style::family, plot_font_style::flags, FONTF_ITALIC, FONTF_OBLIQUE, nsoption_charp, PLOT_FONT_FAMILY_CURSIVE, PLOT_FONT_FAMILY_FANTASY, PLOT_FONT_FAMILY_MONOSPACE, PLOT_FONT_FAMILY_SANS_SERIF, PLOT_FONT_FAMILY_SERIF, PLOT_STYLE_SCALE, plot_font_style::size, and plot_font_style::weight.

Referenced by nsfont_paint(), print_fonts_plot_text(), ro_font_position(), ro_font_split(), and ro_font_width().

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ro_font_position()

static nserror ro_font_position ( const plot_font_style_t *  fstyle, const char *  string, size_t  length, int  x, size_t *  char_offset, int *  actual_x  )

static

Find the position in a string where an x coordinate falls.

Parameters

fstyle	style for this text
string	UTF-8 string to measure
length	length of string
x	x coordinate to search for
char_offset	updated to offset in string of actual_x, [0..length]
actual_x	updated to x coordinate of character closest to x

Returns

true on success, false on error and error reported

Definition at line 267 of file font.c.

References NSERROR_INVALID, NSERROR_OK, nsfont_read_style(), and NSLOG.

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ro_font_split()

static nserror ro_font_split ( const plot_font_style_t *  fstyle, const char *  string, size_t  length, int  x, size_t *  char_offset, int *  actual_x  )

static

Find where to split a string to make it fit a width.

Parameters

fstyle	style for this text
string	UTF-8 string to measure
length	length of string, in bytes
x	width available
char_offset	updated to offset in string of actual_x, [1..length]
actual_x	updated to x coordinate of character closest to x

Returns

true on success, false on error and error reported

On exit, char_offset indicates first character after split point.

Note: char_offset of 0 should never be returned.

Returns: char_offset giving split point closest to x, where actual_x <= x else char_offset giving split point closest to x, where actual_x > x

Returning char_offset == length means no split possible

Definition at line 329 of file font.c.

References NSERROR_INVALID, NSERROR_OK, nsfont_read_style(), and NSLOG.

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ro_font_width()

static nserror ro_font_width ( const plot_font_style_t *  fstyle, const char *  string, size_t  length, int *  width  )

static

Measure the width of a string.

Parameters

fstyle	plot style for this text
string	UTF-8 string to measure
length	length of string
width	updated to width of string[0..length)

Returns

true on success, false on error and error reported

Definition at line 219 of file font.c.

References NSERROR_INVALID, NSERROR_OK, nsfont_read_style(), NSLOG, and width.

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ro_gui_wimp_desktop_font()

static void ro_gui_wimp_desktop_font ( char *  family, size_t  family_size, int *  psize, rufl_style *  pstyle  )

static

Looks up the current desktop font and converts that to a family name, font size and style flags suitable for passing directly to rufl.

Parameters

family	buffer to receive font family
family_size	buffer size
psize	receives the font size in 1/16 points
pstyle	receives the style settings to be passed to rufl

Definition at line 517 of file font.c.

References max, NSLOG, ro_warn_user(), and strcasestr().

Referenced by ro_gui_wimp_get_desktop_font().

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ro_gui_wimp_get_desktop_font()

void ro_gui_wimp_get_desktop_font

(

void

)

Retrieve the current desktop font family, size and style from the WindowManager in a form suitable for passing to rufl.

Definition at line 607 of file font.c.

References ro_gui_desktop_font_family, ro_gui_desktop_font_size, ro_gui_desktop_font_style, and ro_gui_wimp_desktop_font().

Referenced by gui_init(), and ro_gui_user_message().

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Variable Documentation

layout_table

struct gui_layout_table layout_table

static

Initial value:

= {
        .width = ro_font_width,
        .position = ro_font_position,
        .split = ro_font_split,
}

Definition at line 616 of file font.c.

no_font_blending

bool no_font_blending = false

Definition at line 48 of file font.c.

Referenced by cookie_draw(), global_history_draw(), hotlist_draw(), nsfont_paint(), ro_local_history_draw(), and ro_pageinfo_draw().

riscos_layout_table

struct gui_layout_table* riscos_layout_table = &layout_table

Definition at line 622 of file font.c.

Referenced by main().

ro_gui_desktop_font_family

char ro_gui_desktop_font_family[80]

desktop font, size and style being used

Definition at line 45 of file font.c.

Referenced by ro_gui_status_bar_redraw(), and ro_gui_wimp_get_desktop_font().

ro_gui_desktop_font_size

int ro_gui_desktop_font_size = 12

Definition at line 46 of file font.c.

Referenced by ro_gui_status_bar_redraw(), and ro_gui_wimp_get_desktop_font().

ro_gui_desktop_font_style

rufl_style ro_gui_desktop_font_style = rufl_WEIGHT_400

Definition at line 47 of file font.c.

Referenced by ro_gui_status_bar_redraw(), and ro_gui_wimp_get_desktop_font().