102 lines
3.5 KiB
C
102 lines
3.5 KiB
C
/*
|
|
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
|
|
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
|
|
* Copyright 2004 John Tytgat <joty@netsurf-browser.org>
|
|
*
|
|
* This file is part of NetSurf, http://www.netsurf-browser.org/
|
|
*
|
|
* NetSurf is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* NetSurf is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/** \file
|
|
* Font handling (interface).
|
|
*
|
|
* These functions provide font related services. They all work on UTF-8 strings
|
|
* with lengths given.
|
|
*
|
|
* Note that an interface to painting is not defined here. Painting is
|
|
* redirected through platform-dependent plotters anyway, so there is no gain in
|
|
* abstracting it here.
|
|
*/
|
|
|
|
#ifndef _NETSURF_RENDER_FONT_H_
|
|
#define _NETSURF_RENDER_FONT_H_
|
|
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
|
|
#include "css/css.h"
|
|
#include "desktop/plot_style.h"
|
|
|
|
struct font_functions
|
|
{
|
|
/**
|
|
* Measure the width of a string.
|
|
*
|
|
* \param fstyle plot style for this text
|
|
* \param string UTF-8 string to measure
|
|
* \param length length of string, in bytes
|
|
* \param width updated to width of string[0..length)
|
|
* \return true on success, false on error and error reported
|
|
*/
|
|
bool (*font_width)(const plot_font_style_t *fstyle,
|
|
const char *string, size_t length,
|
|
int *width);
|
|
/**
|
|
* Find the position in a string where an x coordinate falls.
|
|
*
|
|
* \param fstyle style for this text
|
|
* \param string UTF-8 string to measure
|
|
* \param length length of string, in bytes
|
|
* \param x x coordinate to search for
|
|
* \param char_offset updated to offset in string of actual_x, [0..length]
|
|
* \param actual_x updated to x coordinate of character closest to x
|
|
* \return true on success, false on error and error reported
|
|
*/
|
|
bool (*font_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 where to split a string to make it fit a width.
|
|
*
|
|
* \param fstyle style for this text
|
|
* \param string UTF-8 string to measure
|
|
* \param length length of string, in bytes
|
|
* \param x width available
|
|
* \param char_offset updated to offset in string of actual_x, [1..length]
|
|
* \param actual_x updated to x coordinate of character closest to x
|
|
* \return 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
|
|
*/
|
|
bool (*font_split)(const plot_font_style_t *fstyle,
|
|
const char *string, size_t length,
|
|
int x, size_t *char_offset, int *actual_x);
|
|
};
|
|
|
|
extern const struct font_functions nsfont;
|
|
|
|
void font_plot_style_from_css(const css_computed_style *css,
|
|
plot_font_style_t *fstyle);
|
|
|
|
#endif
|