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/*
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
* 2008 Vincent Sanders <vince@simtec.co.uk>
*
* 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 "css/css.h"
#include "render/font.h"
#include "desktop/options.h"
#include "utils/utf8.h"
#include "utils/log.h"
#include "framebuffer/fb_gui.h"
#include "framebuffer/fb_font.h"
static FT_Library library;
static FT_Face face_sans_serif;
utf8_convert_ret utf8_to_local_encoding(const char *string,
size_t len,
char **result)
{
return utf8_to_enc(string, "UTF-8", len, result);
}
/* initialise font handling */
bool fb_font_init(void)
{
FT_Error error;
error = FT_Init_FreeType( &library );
if (error) {
LOG(("Freetype could not initialised (code %d)\n", error));
return false;
}
error = FT_New_Face(library,
"/usr/share/fonts/truetype/freefont/FreeSans.ttf",
0,
&face_sans_serif );
if (error) {
LOG(("Could not find default font (code %d)\n", error));
FT_Done_FreeType(library);
return false;
}
error = FT_Set_Pixel_Sizes(face_sans_serif, 0, 14 );
if (error) {
LOG(("Could not set pixel size (code %d)\n", error));
return false;
}
return true;
}
bool fb_font_finalise(void)
{
FT_Done_FreeType(library);
return true;
}
FT_Face
fb_get_face(const struct css_style *style)
{
FT_Face face;
face = face_sans_serif;
FT_Error error;
int size;
if (style->font_size.value.length.unit == CSS_UNIT_PX) {
size = style->font_size.value.length.value;
error = FT_Set_Pixel_Sizes(face_sans_serif, 0, size );
if (error) {
LOG(("Could not set pixel size (code %d)\n", error));
}
} else {
size = css_len2pt(&style->font_size.value.length, style);
error = FT_Set_Char_Size( face, 0, size*64, 72, 72 );
if (error) {
LOG(("Could not set pixel size (code %d)\n", error));
}
}
return face;
}
/**
* Measure the width of a string.
*
* \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 width updated to width of string[0..length)
* \return true on success, false on error and error reported
*/
static bool nsfont_width(const struct css_style *style,
const char *string, size_t length,
int *width)
{
uint32_t ucs4;
size_t nxtchr = 0;
FT_UInt glyph_index;
FT_Face face = fb_get_face(style);
FT_Error error;
*width = 0;
while (nxtchr < length) {
ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
nxtchr = utf8_next(string, length, nxtchr);
glyph_index = FT_Get_Char_Index(face, ucs4);
error = FT_Load_Glyph(face, glyph_index, FT_LOAD_DEFAULT);
if (error)
continue;
*width += face->glyph->advance.x >> 6;
}
return true;
}
/**
* 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 struct css_style *style,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
uint32_t ucs4;
size_t nxtchr = 0;
FT_UInt glyph_index;
FT_Face face = fb_get_face(style);
FT_Error error;
*actual_x = 0;
while (nxtchr < length) {
ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
glyph_index = FT_Get_Char_Index(face, ucs4);
error = FT_Load_Glyph(face, glyph_index, FT_LOAD_DEFAULT);
if (error)
continue;
*actual_x += face->glyph->advance.x >> 6;
if (*actual_x > x)
break;
nxtchr = utf8_next(string, length, nxtchr);
}
*char_offset = nxtchr;
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 struct css_style *style,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
uint32_t ucs4;
size_t nxtchr = 0;
FT_UInt glyph_index;
FT_Face face = fb_get_face(style);
FT_Error error;
int last_space_x = -1;
int last_space_idx = -1;
*actual_x = 0;
while (nxtchr < length) {
ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
if (ucs4 == 0x20) {
last_space_x = *actual_x;
last_space_idx = nxtchr;
}
glyph_index = FT_Get_Char_Index(face, ucs4);
error = FT_Load_Glyph(face, glyph_index, FT_LOAD_DEFAULT);
if (error)
continue;
*actual_x += face->glyph->advance.x >> 6;
if (*actual_x > x)
break;
nxtchr = utf8_next(string, length, nxtchr);
}
if (last_space_x == -1) {
*char_offset = nxtchr;
} else {
*actual_x = last_space_x;
*char_offset = last_space_idx;
}
return true;
}
const struct font_functions nsfont = {
nsfont_width,
nsfont_position_in_string,
nsfont_split
};
/*
* Local Variables:
* c-basic-offset:8
* End:
*/
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