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git-svn-id: svn://svn.chromium.org/chrome/trunk/src@6870 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 147 insertions, 0 deletions

diff --git a/chrome/common/gfx/chrome_font_skia.cc b/chrome/common/gfx/chrome_font_skia.cc
new file mode 100644
index 0000000..17e5fdf
--- /dev/null
+++ b/chrome/common/gfx/chrome_font_skia.cc
@@ -0,0 +1,147 @@
+// 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 "base/logging.h"
+#include "base/sys_string_conversions.h"
+
+#include "skia/include/SkTypeface.h"
+#include "skia/include/SkPaint.h"
+
+ChromeFont::ChromeFont(const ChromeFont& other)
+  : typeface_helper_(other.typeface_),
+    typeface_(other.typeface_),
+    font_name_(other.font_name_),
+    font_size_(other.font_size_),
+    style_(other.style_),
+    height_(other.height_),
+    ascent_(other.ascent_),
+    avg_width_(other.avg_width_) {
+}
+
+ChromeFont::ChromeFont(SkTypeface* tf, const std::wstring& font_name,
+                       int font_size, int style)
+    : typeface_helper_(tf),
+      typeface_(tf),
+      font_name_(font_name),
+      font_size_(font_size),
+      style_(style) {
+  calculateMetrics();
+}
+
+void ChromeFont::calculateMetrics() {
+  SkPaint paint;
+  SkPaint::FontMetrics metrics;
+
+  setupPaint(&paint);
+  paint.getFontMetrics(&metrics);
+
+  if (metrics.fVDMXMetricsValid) {
+    ascent_ = metrics.fVDMXAscent;
+    height_ = ascent_ + metrics.fVDMXDescent;
+  } else {
+    ascent_ = SkScalarRound(-metrics.fAscent);
+    height_ = SkScalarRound(metrics.fHeight);
+  }
+
+  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)));
+  }
+}
+
+int ChromeFont::height() const {
+  return height_;
+}
+
+int ChromeFont::baseline() const {
+  return ascent_;
+}
+
+int ChromeFont::ave_char_width() const {
+  return avg_width_;
+}
+
+ChromeFont ChromeFont::CreateFont(const std::wstring& font_name, int font_size) {
+  DCHECK_GT(font_size, 0);
+
+  SkTypeface* tf = SkTypeface::Create(base::SysWideToUTF8(font_name).c_str(),
+                                      SkTypeface::kNormal);
+  SkAutoUnref tf_helper(tf);
+
+  return ChromeFont(tf, font_name, font_size, NORMAL);
+}
+
+ChromeFont ChromeFont::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 ChromeFont(typeface_, font_name_, 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::Create(base::SysWideToUTF8(font_name_).c_str(),
+                                      static_cast<SkTypeface::Style>(skstyle));
+  SkAutoUnref tf_helper(tf);
+
+  return ChromeFont(tf, font_name_, font_size_ + size_delta, skstyle);
+}
+
+void ChromeFont::setupPaint(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 ChromeFont::GetStringWidth(const std::wstring& text) const {
+  const std::string utf8(base::SysWideToUTF8(text));
+
+  SkPaint paint;
+  setupPaint(&paint);
+  paint.setTextEncoding(SkPaint::kUTF8_TextEncoding);
+  SkScalar width = paint.measureText(utf8.data(), utf8.size());
+
+  return static_cast<int>(ceilf(SkScalarToFloat(width)));
+}
+
+int ChromeFont::GetExpectedTextWidth(int length) const {
+  return length * avg_width_;
+}
+
+
+int ChromeFont::style() const {
+  return style_;
+}
+
+std::wstring ChromeFont::FontName() {
+  return font_name_;
+}
+
+int ChromeFont::FontSize() {
+  return font_size_;
+}
+
+gfx::NativeFont ChromeFont::nativeFont() const {
+  return typeface_;
+}