layout_pango.c File Reference

GTK implementation of layout handling using pango. More...

#include <assert.h>
#include <stdio.h>
#include <gtk/gtk.h>
#include "utils/log.h"
#include "utils/nsoption.h"
#include "netsurf/inttypes.h"
#include "netsurf/layout.h"
#include "netsurf/plot_style.h"
#include "gtk/layout_pango.h"
#include "gtk/plotters.h"

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Functions
static void	nsfont_pango_check (void)
static nserror	nsfont_width (const plot_font_style_t *fstyle, const char *string, size_t length, int *width)
	Measure the width of a string. More...
static nserror	nsfont_position_in_string (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	nsfont_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...
nserror	nsfont_paint (int x, int y, const char *string, size_t length, const plot_font_style_t *fstyle)
	Render a string. More...
PangoFontDescription *	nsfont_style_to_description (const plot_font_style_t *fstyle)

Variables
static PangoContext *	nsfont_pango_context = NULL
static PangoLayout *	nsfont_pango_layout = NULL
static struct gui_layout_table	layout_table
struct gui_layout_table *	nsgtk_layout_table = &layout_table

Detailed Description

GTK implementation of layout handling using pango.

Pango is used handle and render fonts.

Definition in file layout_pango.c.

Function Documentation

nsfont_paint()

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

Render a string.

Parameters

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

Returns

true on success, false on error and error reported

Definition at line 235 of file layout_pango.c.

References current_cr, plot_font_style::foreground, line(), NSERROR_OK, nsfont_pango_check(), nsfont_pango_layout, nsfont_style_to_description(), and nsgtk_set_colour().

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nsfont_pango_check()

static void nsfont_pango_check ( void  )

inlinestatic

Definition at line 43 of file layout_pango.c.

References nsfont_pango_context, nsfont_pango_layout, and NSLOG.

Referenced by nsfont_paint(), nsfont_position_in_string(), and nsfont_width().

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nsfont_position_in_string()

static nserror nsfont_position_in_string ( 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

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

Returns

NSERROR_OK and char_offset and actual_x updated or appropriate error code on faliure

Definition at line 110 of file layout_pango.c.

References NSERROR_OK, nsfont_pango_check(), nsfont_pango_layout, nsfont_style_to_description(), NSLOG, and PRIsizet.

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nsfont_split()

static nserror nsfont_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

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

Returns

NSERROR_OK or appropriate error code on faliure

On exit, char_offset indicates first character after split point.

Note

char_offset of 0 must 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 171 of file layout_pango.c.

References line(), NSERROR_OK, nsfont_style_to_description(), nsfont_width(), NSLOG, and PRIsizet.

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nsfont_style_to_description()

PangoFontDescription * nsfont_style_to_description

(

const plot_font_style_t *

fstyle

)

Definition at line 263 of file layout_pango.c.

References plot_font_style::family, plot_font_style::flags, FONTF_ITALIC, FONTF_OBLIQUE, FONTF_SMALLCAPS, 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 gtk_print_font_paint(), nsfont_paint(), nsfont_position_in_string(), nsfont_split(), and nsfont_width().

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nsfont_width()

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

static

Measure the width of a string.

Parameters

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

Returns

NSERROR_OK and width updated or appropriate error code on faliure

Definition at line 66 of file layout_pango.c.

References NSERROR_OK, nsfont_pango_check(), nsfont_pango_layout, nsfont_style_to_description(), NSLOG, PRIsizet, and width.

Referenced by nsfont_split().

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Variable Documentation

layout_table

struct gui_layout_table layout_table

static

Initial value:

= {
        .width = nsfont_width,
        .position = nsfont_position_in_string,
        .split = nsfont_split,
}

Definition at line 311 of file layout_pango.c.

nsfont_pango_context

PangoContext* nsfont_pango_context = NULL

static

Definition at line 40 of file layout_pango.c.

Referenced by nsfont_pango_check().

nsfont_pango_layout

PangoLayout* nsfont_pango_layout = NULL

static

Definition at line 41 of file layout_pango.c.

Referenced by nsfont_paint(), nsfont_pango_check(), nsfont_position_in_string(), and nsfont_width().

nsgtk_layout_table

struct gui_layout_table* nsgtk_layout_table = &layout_table

Definition at line 317 of file layout_pango.c.

Referenced by gtk_print_signal_begin_print(), main(), and print_button_clicked_cb().