98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
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/*
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* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
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* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
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* Copyright 2004 John Tytgat <joty@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* Font handling interface.
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*
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* These functions provide font related services. They all work on
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* UTF-8 strings with lengths given.
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*
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* Note that an interface to painting is not defined here. Painting is
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* redirected through platform-dependent plotters anyway, so there is
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* no gain in abstracting it here.
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*/
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#ifndef _NETSURF_DESKTOP_FONT_H_
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#define _NETSURF_DESKTOP_FONT_H_
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#include <stdbool.h>
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#include <stddef.h>
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#include "desktop/plot_style.h"
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struct font_functions
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{
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/**
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* Measure the width of a string.
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*
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* \param fstyle plot style for this text
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* \param string UTF-8 string to measure
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* \param length length of string, in bytes
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* \param width updated to width of string[0..length)
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* \return true on success, false on error and error reported
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*/
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bool (*font_width)(const plot_font_style_t *fstyle,
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const char *string, size_t length,
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int *width);
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/**
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* Find the position in a string where an x coordinate falls.
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*
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* \param fstyle style for this text
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* \param string UTF-8 string to measure
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* \param length length of string, in bytes
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* \param x x coordinate to search for
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* \param char_offset updated to offset in string of actual_x, [0..length]
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* \param actual_x updated to x coordinate of character closest to x
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* \return true on success, false on error and error reported
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*/
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bool (*font_position_in_string)(const plot_font_style_t *fstyle,
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const char *string, size_t length,
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int x, size_t *char_offset, int *actual_x);
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/**
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* Find where to split a string to make it fit a width.
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*
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* \param fstyle style for this text
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* \param string UTF-8 string to measure
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* \param length length of string, in bytes
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* \param x width available
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* \param char_offset updated to offset in string of actual_x, [1..length]
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* \param actual_x updated to x coordinate of character closest to x
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* \return true on success, false on error and error reported
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*
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* On exit, char_offset indicates first character after split point.
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*
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* Note: char_offset of 0 should never be returned.
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*
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* Returns:
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* char_offset giving split point closest to x, where actual_x <= x
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* else
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* char_offset giving split point closest to x, where actual_x > x
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*
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* Returning char_offset == length means no split possible
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*/
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bool (*font_split)(const plot_font_style_t *fstyle,
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const char *string, size_t length,
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int x, size_t *char_offset, int *actual_x);
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};
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extern const struct font_functions nsfont;
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#endif
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