netsurf/windows/font.c

225 lines
6.0 KiB
C

/*
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
* Copyright 2008 Vincent Sanders <vince@simtec.co.uk>
* Copyright 2009 Mark Benjamin <netsurf-browser.org.MarkBenjamin@dfgh.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 <windows.h>
#include "css/css.h"
#include "render/font.h"
#include "desktop/options.h"
#include "utils/utf8.h"
#include "windows/font.h"
#include "windows/gui.h"
#include "windows/plot.h"
utf8_convert_ret utf8_to_font_encoding(const struct font_desc* font,
const char *string,
size_t len,
char **result)
{
return utf8_to_enc(string, font->encoding, len, result);
}
utf8_convert_ret utf8_to_local_encoding(const char *string,
size_t len,
char **result)
{
return utf8_to_enc(string, "UCS-2", len, result);
}
utf8_convert_ret utf8_from_local_encoding(const char *string, size_t len,
char **result)
{
assert(string && result);
if (len == 0)
len = strlen(string);
*result = strndup(string, len);
if (!(*result))
return UTF8_CONVERT_NOMEM;
return UTF8_CONVERT_OK;
}
HFONT get_font(const plot_font_style_t *style)
{
char *face = NULL;
DWORD family;
switch(style->family) {
case PLOT_FONT_FAMILY_SERIF:
face = strdup(nsoption_charp(font_serif));
family = FF_ROMAN | DEFAULT_PITCH;
break;
case PLOT_FONT_FAMILY_MONOSPACE:
face = strdup(nsoption_charp(font_mono));
family = FF_MODERN | DEFAULT_PITCH;
break;
case PLOT_FONT_FAMILY_CURSIVE:
face = strdup(nsoption_charp(font_cursive));
family = FF_SCRIPT | DEFAULT_PITCH;
break;
case PLOT_FONT_FAMILY_FANTASY:
face = strdup(nsoption_charp(font_fantasy));
family = FF_DECORATIVE | DEFAULT_PITCH;
break;
case PLOT_FONT_FAMILY_SANS_SERIF:
default:
face = strdup(nsoption_charp(font_sans));
family = FF_SWISS | DEFAULT_PITCH;
break;
}
int nHeight = -10;
HDC hdc = GetDC(font_hwnd);
nHeight = -MulDiv(style->size, GetDeviceCaps(hdc, LOGPIXELSY), 72 * FONT_SIZE_SCALE);
ReleaseDC(font_hwnd, hdc);
HFONT font = CreateFont(
nHeight, /* height */
0, /* width */
0, /* escapement*/
0, /* orientation */
style->weight,
(style->flags & FONTF_ITALIC) ? TRUE : FALSE,
FALSE, /* underline */
FALSE, /* strike */
DEFAULT_CHARSET, /* for locale */
OUT_DEFAULT_PRECIS, /* general 'best match' */
CLIP_DEFAULT_PRECIS,
DEFAULT_QUALITY,
family,
face /* name of font face */
);
if (face != NULL)
free(face);
if (font == NULL) {
if (style->family == PLOT_FONT_FAMILY_MONOSPACE)
font = (HFONT) GetStockObject(ANSI_FIXED_FONT);
else
font = (HFONT) GetStockObject(ANSI_VAR_FONT);
}
if (font == NULL)
font = (HFONT) GetStockObject(SYSTEM_FONT);
return font;
}
static bool nsfont_width(const plot_font_style_t *style,
const char *string, size_t length,
int *width)
{
HDC hdc = GetDC(NULL);
HFONT font = get_font(style);
HFONT fontbak = SelectObject(hdc, font);
SIZE s;
if (length < 8192) { /* win 95/98/ME */
/* may well need to convert utf-8 to lpctstr */
GetTextExtentPoint32(hdc, string,
utf8_bounded_length(string, length), &s);
*width = s.cx;
font = SelectObject(hdc, fontbak);
DeleteObject(font);
ReleaseDC(NULL, hdc);
return true;
}
font = SelectObject(hdc, fontbak);
DeleteObject(font);
ReleaseDC(NULL, hdc);
return false;
}
/**
* Find the position in a string where an x coordinate falls.
*
* \param style css_style for this text, with style->font_size.size ==
* CSS_FONT_SIZE_LENGTH
* \param string UTF-8 string to measure
* \param length length of string
* \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
*/
static bool nsfont_position_in_string(const plot_font_style_t *style,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
HDC hdc = GetDC(NULL);
HFONT font = get_font(style);
HFONT fontbak = SelectObject(hdc, font);
SIZE s;
int offset;
GetTextExtentExPoint(hdc, string, length, x, &offset, NULL, &s);
*char_offset = (size_t)offset;
nsfont_width(style, string, *char_offset, actual_x);
font = SelectObject(hdc, fontbak);
DeleteObject(font);
ReleaseDC(NULL, hdc);
return true;
}
/**
* Find where to split a string to make it fit a width.
*
* \param style css_style for this text, with style->font_size.size ==
* CSS_FONT_SIZE_LENGTH
* \param string UTF-8 string to measure
* \param length length of string
* \param x width available
* \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
*
* On exit, [char_offset == 0 ||
* string[char_offset] == ' ' ||
* char_offset == length]
*/
static bool nsfont_split(const plot_font_style_t *style,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
nsfont_position_in_string(style, string, length, x, char_offset,
actual_x);
if (*char_offset == length) {
printf("%s %d\n",string, (int)(*char_offset));
return true;
}
while ((string[*char_offset] != ' ') && (*char_offset > 0))
(*char_offset)--;
nsfont_position_in_string(style, string, *char_offset, x, char_offset,
actual_x);
return true;
}
const struct font_functions nsfont = {
nsfont_width,
nsfont_position_in_string,
nsfont_split
};