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361 lines
8.5 KiB
361 lines
8.5 KiB
/*
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* Copyright 2009 - 2014 Vincent Sanders <vince@netsurf-browser.org>
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* Copyright 2009 - 2013 Michael Drake <tlsa@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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/**
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* \file
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* Windows font handling and character encoding implementation.
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*/
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#include "utils/config.h"
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#include <assert.h>
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#include <windows.h>
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#include "netsurf/inttypes.h"
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#include "utils/log.h"
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#include "utils/nsoption.h"
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#include "utils/utf8.h"
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#include "netsurf/layout.h"
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#include "netsurf/utf8.h"
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#include "netsurf/plot_style.h"
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#include "windows/font.h"
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HWND font_hwnd;
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/* exported interface documented in windows/font.h */
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nserror
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utf8_to_font_encoding(const struct font_desc* font,
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const char *string,
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size_t len,
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char **result)
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{
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return utf8_to_enc(string, font->encoding, len, result);
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}
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/**
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* Convert a string to UCS2 from UTF8
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*
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* \param[in] string source string
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* \param[in] len source string length
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* \param[out] result The UCS2 string
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*/
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static nserror
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utf8_to_local_encoding(const char *string, size_t len, char **result)
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{
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return utf8_to_enc(string, "UCS-2", len, result);
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}
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/**
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* Convert a string to UTF8 from local encoding
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*
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* \param[in] string source string
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* \param[in] len source string length
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* \param[out] result The UTF8 string
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*/
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static nserror
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utf8_from_local_encoding(const char *string, size_t len, char **result)
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{
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assert(string && result);
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if (len == 0) {
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len = strlen(string);
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}
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*result = strndup(string, len);
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if (!(*result)) {
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return NSERROR_NOMEM;
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}
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return NSERROR_OK;
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}
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/* exported interface documented in windows/font.h */
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HFONT get_font(const plot_font_style_t *style)
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{
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char *face = NULL;
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DWORD family;
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int nHeight;
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HDC hdc;
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HFONT font;
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switch(style->family) {
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case PLOT_FONT_FAMILY_SERIF:
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face = strdup(nsoption_charp(font_serif));
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family = FF_ROMAN | DEFAULT_PITCH;
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break;
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case PLOT_FONT_FAMILY_MONOSPACE:
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face = strdup(nsoption_charp(font_mono));
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family = FF_MODERN | DEFAULT_PITCH;
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break;
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case PLOT_FONT_FAMILY_CURSIVE:
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face = strdup(nsoption_charp(font_cursive));
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family = FF_SCRIPT | DEFAULT_PITCH;
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break;
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case PLOT_FONT_FAMILY_FANTASY:
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face = strdup(nsoption_charp(font_fantasy));
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family = FF_DECORATIVE | DEFAULT_PITCH;
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break;
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case PLOT_FONT_FAMILY_SANS_SERIF:
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default:
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face = strdup(nsoption_charp(font_sans));
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family = FF_SWISS | DEFAULT_PITCH;
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break;
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}
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nHeight = -10;
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hdc = GetDC(font_hwnd);
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nHeight = -MulDiv(style->size, GetDeviceCaps(hdc, LOGPIXELSY), 72 * PLOT_STYLE_SCALE);
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ReleaseDC(font_hwnd, hdc);
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font = CreateFont(nHeight, /* height */
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0, /* width */
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0, /* escapement*/
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0, /* orientation */
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style->weight,
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(style->flags & FONTF_ITALIC) ? TRUE : FALSE,
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FALSE, /* underline */
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FALSE, /* strike */
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DEFAULT_CHARSET, /* for locale */
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OUT_DEFAULT_PRECIS, /* general 'best match' */
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CLIP_DEFAULT_PRECIS,
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DEFAULT_QUALITY,
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family,
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face); /* name of font face */
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if (face != NULL) {
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free(face);
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}
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if (font == NULL) {
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if (style->family == PLOT_FONT_FAMILY_MONOSPACE) {
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font = (HFONT) GetStockObject(ANSI_FIXED_FONT);
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} else {
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font = (HFONT) GetStockObject(ANSI_VAR_FONT);
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}
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}
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if (font == NULL) {
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font = (HFONT) GetStockObject(SYSTEM_FONT);
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}
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return font;
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}
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/* size of temporary wide character string for computing string width */
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#define WSTRLEN 4096
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/**
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* Measure the width of a string.
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*
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* \param[in] style plot style for this text
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* \param[in] utf8str string encoded in UTF-8 to measure
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* \param[in] utf8len length of string, in bytes
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* \param[out] width updated to width of string[0..length)
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* \return NSERROR_OK on success otherwise appropriate error code
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*/
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static nserror
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win32_font_width(const plot_font_style_t *style,
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const char *utf8str,
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size_t utf8len,
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int *width)
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{
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nserror ret = NSERROR_OK;
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HDC hdc;
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HFONT font;
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HFONT fontbak;
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SIZE sizl; /* size in logical units */
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BOOL wres;
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int wclen; /* wide char length */
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static WCHAR wstr[WSTRLEN]; /* temporary wide char string */
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if (utf8len == 0) {
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*width = 0;
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return ret;
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}
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hdc = GetDC(NULL);
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font = get_font(style);
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fontbak = SelectObject(hdc, font);
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wclen = MultiByteToWideChar(CP_UTF8, 0, utf8str, utf8len, wstr, WSTRLEN);
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if (wclen != 0) {
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wres = GetTextExtentPoint32W(hdc, wstr, wclen, &sizl);
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if (wres == FALSE) {
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ret = NSERROR_INVALID;
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} else {
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*width = sizl.cx;
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}
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} else {
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ret = NSERROR_NOSPACE;
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}
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font = SelectObject(hdc, fontbak);
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DeleteObject(font);
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ReleaseDC(NULL, hdc);
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return ret;
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}
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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 style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param utf8str string to measure encoded in UTF-8
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* \param utf8len length of string
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* \param 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 NSERROR_OK on success otherwise appropriate error code
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*/
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static nserror
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win32_font_position(const plot_font_style_t *style,
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const char *utf8str,
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size_t utf8len,
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int x,
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size_t *char_offset,
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int *actual_x)
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{
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HDC hdc;
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HFONT font;
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HFONT fontbak;
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SIZE s;
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int offset;
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nserror ret = NSERROR_OK;
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/* deal with zero length input or invalid search co-ordiate */
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if ((utf8len == 0) || (x < 1)) {
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*char_offset = 0;
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*actual_x = 0;
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return ret;
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}
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hdc = GetDC(NULL);
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font = get_font(style);
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fontbak = SelectObject(hdc, font);
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if ((GetTextExtentExPointA(hdc, utf8str, utf8len, x, &offset, NULL, &s) != 0) &&
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(GetTextExtentPoint32A(hdc, utf8str, offset, &s) != 0)) {
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*char_offset = (size_t)offset;
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*actual_x = s.cx;
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} else {
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ret = NSERROR_UNKNOWN;
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}
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font = SelectObject(hdc, fontbak);
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DeleteObject(font);
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ReleaseDC(NULL, hdc);
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return ret;
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}
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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 style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param x width available
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* \param[out] 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 NSERROR_OK on success otherwise appropriate error code
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*
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* On exit, [char_offset == 0 ||
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* string[char_offset] == ' ' ||
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* char_offset == length]
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*/
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static nserror
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win32_font_split(const plot_font_style_t *style,
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const char *string,
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size_t length,
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int x,
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size_t *offset,
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int *actual_x)
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{
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nserror res;
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int c_off;
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/* get the offset into teh string on the proposed position */
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res = win32_font_position(style, string, length, x, offset, actual_x);
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if (res != NSERROR_OK) {
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return res;
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}
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/* return the whole string fits in the proposed length */
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if (*offset == length) {
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return NSERROR_OK;
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}
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c_off = *offset;
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/* walk backwards through string looking for space to break on */
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while ((string[*offset] != ' ') &&
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(*offset > 0)) {
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(*offset)--;
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}
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/* walk forwards through string looking for space if back failed */
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if (*offset == 0) {
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*offset = c_off;
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while ((*offset < length) &&
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(string[*offset] != ' ')) {
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(*offset)++;
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}
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}
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/* find the actual string width of the break */
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res = win32_font_width(style, string, *offset, actual_x);
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NSLOG(netsurf, DEEPDEBUG,
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"ret %d Split %u chars at %ipx: Split at char %i (%ipx) - %.*s",
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res, length, x, *offset, *actual_x, *offset, string);
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return res;
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}
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/** win32 font operations table */
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static struct gui_layout_table layout_table = {
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.width = win32_font_width,
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.position = win32_font_position,
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.split = win32_font_split,
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};
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struct gui_layout_table *win32_layout_table = &layout_table;
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/** win32 utf8 encoding operations table */
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static struct gui_utf8_table utf8_table = {
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.utf8_to_local = utf8_to_local_encoding,
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.local_to_utf8 = utf8_from_local_encoding,
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};
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struct gui_utf8_table *win32_utf8_table = &utf8_table;
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