mirror of
https://github.com/netsurf-browser/netsurf
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17be8cf216
The netsurf core is driven from numerous operation tables most of which are now set through a common netsurf_register() interface. The font and plotting interfaces are currently separate and unlike all the other operation tables are modified for differing contexts. This change moves the font operations alongside all the other operations table and remove unnecessary interaction with the renderers font internals. Further this also removes the need for css internals to be visible in frontends.
98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/*
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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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