Rework gfx::Font by moving platform-specific code into inner classes.

gfx::Font is a platform-neutral API shim that exists as a wrapper object to allow for the creation and lifetime of gfx::Font objects to remain consistent with past usage.

gfx::PlatformFont is an interface implemented by the platform-specific inner classes (gfx::PlatformFontWin,Mac,Gtk).

BUG=none
TEST=existing unittests

Review URL: http://codereview.chromium.org/3083022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@56040 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 142 insertions, 0 deletions

diff --git a/gfx/platform_font_mac.mm b/gfx/platform_font_mac.mm
new file mode 100644
index 0000000..89616c5
--- /dev/null
+++ b/gfx/platform_font_mac.mm
@@ -0,0 +1,142 @@
+// Copyright (c) 2010 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 "gfx/platform_font_mac.h"
+
+#include <Cocoa/Cocoa.h>
+
+#include "base/logging.h"
+#include "base/scoped_nsobject.h"
+#include "base/sys_string_conversions.h"
+#include "gfx/canvas_skia.h"
+#include "gfx/font.h"
+
+namespace gfx {
+
+////////////////////////////////////////////////////////////////////////////////
+// PlatformFontMac, public:
+
+PlatformFontMac::PlatformFontMac() {
+  font_size_ = [NSFont systemFontSize];
+  style_ = gfx::Font::NORMAL;
+  NSFont* system_font = [NSFont systemFontOfSize:font_size_];
+  font_name_ = base::SysNSStringToWide([system_font fontName]);
+  CalculateMetrics();
+}
+
+PlatformFontMac::PlatformFontMac(const Font& other) {
+}
+
+PlatformFontMac::PlatformFontMac(NativeFont native_font) {
+}
+
+PlatformFontMac::PlatformFontMac(const std::wstring& font_name,
+                                 int font_size) {
+  InitWithNameSizeAndStyle(font_name, font_size, gfx::Font::NORMAL);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// PlatformFontMac, PlatformFont implementation:
+
+Font PlatformFontMac::DeriveFont(int size_delta, int style) const {
+  return Font(new PlatformFontMac(font_name_, font_size_ + size_delta, style));
+}
+
+int PlatformFontMac::GetHeight() const {
+  return height_;
+}
+
+int PlatformFontMac::GetBaseline() const {
+  return ascent_;
+}
+
+int PlatformFontMac::GetAverageCharacterWidth() const {
+  return average_width_;
+}
+
+int PlatformFontMac::GetStringWidth(const std::wstring& text) const {
+  int width = 0, height = 0;
+  CanvasSkia::SizeStringInt(text, Font(const_cast<PlatformFontMac*>(this)),
+                            &width, &height, gfx::Canvas::NO_ELLIPSIS);
+  return width;
+}
+
+int PlatformFontMac::GetExpectedTextWidth(int length) const {
+  return length * average_width_;
+}
+
+int PlatformFontMac::GetStyle() const {
+  return style_;
+}
+
+const std::wstring& PlatformFontMac::GetFontName() const {
+  return font_name_;
+}
+
+int PlatformFontMac::GetFontSize() const {
+  return font_size_;
+}
+
+NativeFont PlatformFontMac::GetNativeFont() const {
+  // TODO(pinkerton): apply |style_| to font. http://crbug.com/34667
+  // We could cache this, but then we'd have to conditionally change the
+  // dtor just for MacOS. Not sure if we want to/need to do that.
+  return [NSFont fontWithName:base::SysWideToNSString(font_name_)
+                         size:font_size_];
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// PlatformFontMac, private:
+
+PlatformFontMac::PlatformFontMac(const std::wstring& font_name,
+                                 int font_size,
+                                 int style) {
+  InitWithNameSizeAndStyle(font_name, font_size, style);
+}
+
+void PlatformFontMac::InitWithNameSizeAndStyle(const std::wstring& font_name,
+                                               int font_size,
+                                               int style) {
+  font_name_ = font_name;
+  font_size_ = font_size;
+  style_ = style;
+  CalculateMetrics();
+}
+
+void PlatformFontMac::CalculateMetrics() {
+  NSFont* font = GetNativeFont();
+  scoped_nsobject<NSLayoutManager> layout_manager(
+      [[NSLayoutManager alloc] init]);
+  height_ = [layout_manager defaultLineHeightForFont:font];
+  ascent_ = [font ascender];
+  average_width_ =
+      [font boundingRectForGlyph:[font glyphWithName:@"x"]].size.width;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// PlatformFont, public:
+
+// static
+PlatformFont* PlatformFont::CreateDefault() {
+  return new PlatformFontMac;
+}
+
+// static
+PlatformFont* PlatformFont::CreateFromFont(const Font& other) {
+  return new PlatformFontMac(other);
+}
+
+// static
+PlatformFont* PlatformFont::CreateFromNativeFont(NativeFont native_font) {
+  return new PlatformFontMac(native_font);
+}
+
+// static
+PlatformFont* PlatformFont::CreateFromNameAndSize(const std::wstring& font_name,
+                                                  int font_size) {
+  return new PlatformFontMac(font_name, font_size);
+}
+
+}  // namespace gfx
+