netsurf/frontends/atari/font.c
2016-05-30 12:10:08 +01:00

157 lines
4.4 KiB
C

/*
* Copyright 2010 Ole Loots <ole@monochrom.net>
*
* 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/>.
*/
#include <inttypes.h>
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include "utils/utf8.h"
#include "utils/log.h"
#include "utils/nsoption.h"
#include "netsurf/layout.h"
#include "netsurf/mouse.h"
#include "desktop/plotters.h"
#include "atari/gui.h"
#include "atari/plot/fontplot.h"
#include "atari/plot/plot.h"
#include "atari/findfile.h"
#include "atari/font.h"
extern FONT_PLOTTER fplotter;
/**
* Find the position in a string where an x coordinate falls.
*
* \param[in] fstyle style for this text
* \param[in] string UTF-8 string to measure
* \param[in] length length of string, in bytes
* \param[in] x coordinate to search for
* \param[out] char_offset updated to offset in string of actual_x, [0..length]
* \param[out] actual_x updated to x coordinate of character closest to x
* \return NSERROR_OK and char_offset and actual_x updated or appropriate error code on faliure
*/
static nserror
atari_font_position(const plot_font_style_t *fstyle,
const char *string,
size_t length,
int x,
size_t *char_offset,
int *actual_x)
{
float scale = plot_get_scale();
if (scale != 1.0) {
plot_font_style_t newstyle = *fstyle;
newstyle.size = (int)((float)fstyle->size*scale);
fplotter->pixel_pos(fplotter, &newstyle, string, length, x,
char_offset, actual_x);
} else {
fplotter->pixel_pos(fplotter, fstyle, string, length, x,
char_offset, actual_x);
}
return NSERROR_OK;
}
/**
* Find where to split a string to make it fit a width.
*
* \param[in] fstyle style for this text
* \param[in] string UTF-8 string to measure
* \param[in] length length of string, in bytes
* \param[in] x width available
* \param[out] char_offset updated to offset in string of actual_x, [1..length]
* \param[out] actual_x updated to x coordinate of character closest to x
* \return 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
*/
static nserror
atari_font_split(const plot_font_style_t *fstyle,
const char *string,
size_t length,
int x,
size_t *char_offset,
int *actual_x)
{
float scale = plot_get_scale();
if (scale != 1.0) {
plot_font_style_t newstyle = *fstyle;
newstyle.size = (int)((float)fstyle->size*scale);
fplotter->str_split(fplotter, &newstyle, string, length, x,
char_offset, actual_x);
} else {
fplotter->str_split(fplotter, fstyle, string, length, x,
char_offset, actual_x);
}
return NSERROR_OK;
}
/**
* Measure the width of a string.
*
* \param[in] fstyle plot style for this text
* \param[in] string UTF-8 string to measure
* \param[in] length length of string, in bytes
* \param[out] width updated to width of string[0..length)
* \return NSERROR_OK and width updated or appropriate error code on faliure
*/
static nserror
atari_font_width(const plot_font_style_t *fstyle,
const char *str,
size_t length,
int * width)
{
float scale = plot_get_scale();
if (scale != 1.0) {
plot_font_style_t newstyle = *fstyle;
newstyle.size = (int)((float)fstyle->size*scale);
fplotter->str_width(fplotter, &newstyle, str, length, width);
} else {
fplotter->str_width(fplotter, fstyle, str, length, width);
}
return NSERROR_OK;
}
static struct gui_layout_table layout_table = {
.width = atari_font_width,
.position = atari_font_position,
.split = atari_font_split,
};
struct gui_layout_table *atari_layout_table = &layout_table;