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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 "app/gfx/font.h"
#include <fontconfig/fontconfig.h>
#include <gtk/gtk.h>
#include "app/gfx/canvas.h"
#include "base/string_util.h"
namespace gfx {
namespace {
// Returns a PangoContext that is used to get metrics. The returned context
// should never be freed.
PangoContext* get_context() {
static PangoContext* context = NULL;
if (!context) {
context = gdk_pango_context_get_for_screen(gdk_screen_get_default());
pango_context_set_language(context, gtk_get_default_language());
}
return context;
}
}
Font* Font::default_font_ = NULL;
// static
Font Font::CreateFont(PangoFontDescription* desc) {
return Font(desc);
}
Font Font::DeriveFont(int size_delta, int style) const {
// If the delta is negative, if must not push the size below 1
if (size_delta < 0)
DCHECK_LT(-size_delta, font_ref_->size());
PangoFontDescription* pfd = pango_font_description_copy(nativeFont());
pango_font_description_set_size(
pfd, (font_ref_->size() + size_delta) * PANGO_SCALE);
pango_font_description_set_style(
pfd, style & ITALIC ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL);
pango_font_description_set_weight(
pfd, style & BOLD ? PANGO_WEIGHT_BOLD : PANGO_WEIGHT_NORMAL);
Font font(pfd);
pango_font_description_free(pfd);
return font;
}
int Font::height() const {
return font_ref_->GetHeight();
}
int Font::baseline() const {
return font_ref_->GetAscent();
}
int Font::ave_char_width() const {
return font_ref_->GetAveCharWidth();
}
int Font::GetStringWidth(const std::wstring& text) const {
int width = 0, height = 0;
Canvas::SizeStringInt(text, *this, &width, &height, 0);
return width;
}
int Font::GetExpectedTextWidth(int length) const {
return length * font_ref_->GetAveCharWidth();
}
int Font::style() const {
return font_ref_->style();
}
std::wstring Font::FontName() {
return font_ref_->family();
}
int Font::FontSize() {
return font_ref_->size();
}
PangoFontDescription* Font::nativeFont() const {
return font_ref_->pfd();
}
// Get the default gtk system font (name and size).
Font::Font() {
if (default_font_ == NULL) {
GtkSettings* settings = gtk_settings_get_default();
gchar* font_name = NULL;
g_object_get(G_OBJECT(settings),
"gtk-font-name", &font_name,
NULL);
// Temporary CHECK for helping track down
// http://code.google.com/p/chromium/issues/detail?id=12530
CHECK(font_name) << " Unable to get gtk-font-name for default font.";
PangoFontDescription* desc =
pango_font_description_from_string(font_name);
default_font_ = new Font(desc);
pango_font_description_free(desc);
g_free(font_name);
}
*this = *default_font_;
}
// static
Font Font::CreateFont(const std::wstring& font_family, int font_size) {
DCHECK_GT(font_size, 0);
PangoFontDescription* pfd = pango_font_description_new();
pango_font_description_set_family(pfd, WideToUTF8(font_family).c_str());
pango_font_description_set_size(pfd, font_size * PANGO_SCALE);
pango_font_description_set_style(pfd, PANGO_STYLE_NORMAL);
pango_font_description_set_weight(pfd, PANGO_WEIGHT_NORMAL);
Font font(pfd);
pango_font_description_free(pfd);
return font;
}
Font::Font(PangoFontDescription* desc) {
PangoContext* context = get_context();
pango_context_set_font_description(context, desc);
int size = pango_font_description_get_size(desc) / PANGO_SCALE;
int style = 0;
if (pango_font_description_get_weight(desc) >= PANGO_WEIGHT_BOLD)
style |= BOLD;
if (pango_font_description_get_style(desc) == PANGO_STYLE_ITALIC)
style |= ITALIC;
std::wstring name(UTF8ToWide(pango_font_description_get_family(desc)));
font_ref_ = PangoFontRef::Create(desc, name, size, style);
}
// PangoFontRef ---------------------------------------------------------------
// Maximum number of PangoFontRefs cached.
static const size_t kMaxCacheSize = 20;
// static
Font::PangoFontRef* Font::PangoFontRef::Create(PangoFontDescription* pfd,
const std::wstring& family,
int size,
int style) {
Cache* cache = GetCache();
for (Cache::iterator i = cache->begin(); i != cache->end(); ++i) {
PangoFontRef* ref = *i;
if (ref->size() == size && ref->style() == style &&
ref->family() == family)
return ref;
}
PangoFontRef* ref = new PangoFontRef(pfd, family, size, style);
AddToCache(ref);
return ref;
}
Font::PangoFontRef::~PangoFontRef() {
pango_font_description_free(pfd_);
}
int Font::PangoFontRef::GetHeight() const {
CalculateMetricsIfNecessary();
return height_;
}
int Font::PangoFontRef::GetAscent() const {
CalculateMetricsIfNecessary();
return ascent_;
}
int Font::PangoFontRef::GetAveCharWidth() const {
CalculateMetricsIfNecessary();
return ave_char_width_;
}
Font::PangoFontRef::PangoFontRef(PangoFontDescription* pfd,
const std::wstring& family,
int size,
int style)
: pfd_(pango_font_description_copy(pfd)),
family_(family),
size_(size),
style_(style),
height_(0),
ascent_(0),
ave_char_width_(0),
calculated_metrics_(false) {
}
void Font::PangoFontRef::CalculateMetricsIfNecessary() const {
if (calculated_metrics_)
return;
calculated_metrics_ = true;
PangoContext* context = get_context();
pango_context_set_font_description(context, pfd_);
PangoFontMetrics* metrics = pango_context_get_metrics(context, pfd_, NULL);
ascent_ = pango_font_metrics_get_ascent(metrics) / PANGO_SCALE;
height_ = ascent_ + pango_font_metrics_get_descent(metrics) / PANGO_SCALE;
ave_char_width_ = pango_font_metrics_get_approximate_char_width(metrics) /
PANGO_SCALE;
pango_font_metrics_unref(metrics);
}
// static
Font::PangoFontRef::Cache* Font::PangoFontRef::GetCache() {
static Cache* cache = NULL;
if (!cache)
cache = new Cache();
return cache;
}
// static
void Font::PangoFontRef::AddToCache(PangoFontRef* ref) {
ref->AddRef();
Cache* cache = GetCache();
cache->push_back(ref);
while (cache->size() >= kMaxCacheSize) {
PangoFontRef* ref = cache->front();
cache->pop_front();
ref->Release();
}
}
} // namespace gfx
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