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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/common/gfx/chrome_font.h"
#include <fontconfig/fontconfig.h>
#include <gtk/gtk.h>
#include "base/string_util.h"
ChromeFont* ChromeFont::default_font_ = NULL;
// Find the best match font for |family_name| in the same way as Skia
// to make sure CreateFont() successfully creates default font.
// In Skia, it only checks the best match font. If it failed to find,
// SkTypeface will be NULL for that font family. It eventually causes segfault.
// For example, family_name = "Sans" and system may have various fonts.
// The first font family in FcPattern will be "DejaVu Sans" but a font family
// returned by FcFontMatch will be "VL PGothic".
// In this case, SkTypeface for "Sans" returns NULL even if system has font
// for "Sans" font family.
// See FontMatch() in skia/ports/SkFontHost_fontconfig.cpp for more detail.
static std::wstring FindBestMatchFontFamilyName(const char* family_name) {
FcPattern* pattern = FcPatternCreate();
FcValue fcvalue;
fcvalue.type = FcTypeString;
char* family_name_copy = strdup(family_name);
fcvalue.u.s = reinterpret_cast<FcChar8*>(family_name_copy);
FcPatternAdd(pattern, FC_FAMILY, fcvalue, 0);
FcConfigSubstitute(0, pattern, FcMatchPattern);
FcDefaultSubstitute(pattern);
FcResult result;
FcPattern* match = FcFontMatch(0, pattern, &result);
DCHECK(match) << "Could not find font: " << family_name;
FcChar8* match_family;
FcPatternGetString(match, FC_FAMILY, 0, &match_family);
std::wstring font_family = UTF8ToWide(
reinterpret_cast<char*>(match_family));
FcPatternDestroy(match);
FcPatternDestroy(pattern);
free(family_name_copy);
return font_family;
}
// Get the default gtk system font (name and size).
ChromeFont::ChromeFont() {
if (default_font_ == NULL) {
gtk_init(NULL, NULL);
GtkSettings* settings = gtk_settings_get_default();
GValue value = {0};
g_value_init(&value, G_TYPE_STRING);
g_object_get_property(G_OBJECT(settings), "gtk-font-name", &value);
// gtk-font-name may be wrapped in quotes.
gchar* font_name = g_strdup_value_contents(&value);
gchar* font_ptr = font_name;
if (font_ptr[0] == '\"')
font_ptr++;
if (font_ptr[strlen(font_ptr) - 1] == '\"')
font_ptr[strlen(font_ptr) - 1] = '\0';
PangoFontDescription* desc =
pango_font_description_from_string(font_ptr);
gint size = pango_font_description_get_size(desc);
const char* family_name = pango_font_description_get_family(desc);
// Find best match font for |family_name| to make sure we can get
// SkTypeface for default font.
// TODO(agl): remove this.
std::wstring font_family = FindBestMatchFontFamilyName(family_name);
default_font_ = new ChromeFont(CreateFont(font_family, size / PANGO_SCALE));
pango_font_description_free(desc);
g_free(font_name);
g_value_unset(&value);
DCHECK(default_font_);
}
CopyChromeFont(*default_font_);
}
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