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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 "app/gfx/canvas.h"
#include "base/logging.h"
#include "base/sys_string_conversions.h"
#include "third_party/skia/include/core/SkTypeface.h"
#include "third_party/skia/include/core/SkPaint.h"
namespace gfx {
Font::Font(const Font& other) {
CopyFont(other);
}
Font& Font::operator=(const Font& other) {
CopyFont(other);
return *this;
}
Font::Font(SkTypeface* tf, const std::wstring& font_family, int font_size,
int style)
: typeface_helper_(new SkAutoUnref(tf)),
typeface_(tf),
font_family_(font_family),
font_size_(font_size),
style_(style) {
tf->ref();
calculateMetrics();
}
void Font::calculateMetrics() {
SkPaint paint;
SkPaint::FontMetrics metrics;
PaintSetup(&paint);
paint.getFontMetrics(&metrics);
ascent_ = SkScalarRound(-metrics.fAscent);
height_ = SkScalarRound(-metrics.fAscent + metrics.fDescent +
metrics.fLeading);
if (metrics.fAvgCharWidth) {
avg_width_ = SkScalarRound(metrics.fAvgCharWidth);
} else {
static const char x_char = 'x';
paint.setTextEncoding(SkPaint::kUTF8_TextEncoding);
SkScalar width = paint.measureText(&x_char, 1);
avg_width_ = static_cast<int>(ceilf(SkScalarToFloat(width)));
}
}
void Font::CopyFont(const Font& other) {
typeface_helper_.reset(new SkAutoUnref(other.typeface_));
typeface_ = other.typeface_;
typeface_->ref();
font_family_ = other.font_family_;
font_size_ = other.font_size_;
style_ = other.style_;
height_ = other.height_;
ascent_ = other.ascent_;
avg_width_ = other.avg_width_;
}
int Font::height() const {
return height_;
}
int Font::baseline() const {
return ascent_;
}
int Font::ave_char_width() const {
return avg_width_;
}
Font Font::CreateFont(const std::wstring& font_family, int font_size) {
DCHECK_GT(font_size, 0);
SkTypeface* tf = SkTypeface::CreateFromName(
base::SysWideToUTF8(font_family).c_str(), SkTypeface::kNormal);
// Temporary CHECK for tracking down
// http://code.google.com/p/chromium/issues/detail?id=12530
CHECK(tf) << "Could not find font: " << base::SysWideToUTF8(font_family);
SkAutoUnref tf_helper(tf);
return Font(tf, font_family, font_size, NORMAL);
}
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_size_);
}
if (style == style_) {
// Fast path, we just use the same typeface at a different size
return Font(typeface_, font_family_, font_size_ + size_delta, style_);
}
// If the style has changed we may need to load a new face
int skstyle = SkTypeface::kNormal;
if (BOLD & style)
skstyle |= SkTypeface::kBold;
if (ITALIC & style)
skstyle |= SkTypeface::kItalic;
SkTypeface* tf = SkTypeface::CreateFromName(
base::SysWideToUTF8(font_family_).c_str(),
static_cast<SkTypeface::Style>(skstyle));
SkAutoUnref tf_helper(tf);
return Font(tf, font_family_, font_size_ + size_delta, skstyle);
}
void Font::PaintSetup(SkPaint* paint) const {
paint->setAntiAlias(false);
paint->setSubpixelText(false);
paint->setTextSize(SkFloatToScalar(font_size_));
paint->setTypeface(typeface_);
paint->setFakeBoldText((BOLD & style_) && !typeface_->isBold());
paint->setTextSkewX((ITALIC & style_) && !typeface_->isItalic() ?
-SK_Scalar1/4 : 0);
}
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 * avg_width_;
}
int Font::style() const {
return style_;
}
std::wstring Font::FontName() {
return font_family_;
}
int Font::FontSize() {
return font_size_;
}
NativeFont Font::nativeFont() const {
return typeface_;
}
} // namespace gfx
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