1 files changed, 224 insertions, 0 deletions
diff --git a/gfx/font_win.cc b/gfx/font_win.cc
new file mode 100644
index 0000000..b55057c
--- /dev/null
+++ b/gfx/font_win.cc
@@ -0,0 +1,224 @@
+// 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 "gfx/font.h"
+
+#include <windows.h>
+#include <math.h>
+
+#include <algorithm>
+
+#include "base/logging.h"
+#include "base/string_util.h"
+#include "base/win_util.h"
+
+namespace gfx {
+
+// static
+Font::HFontRef* Font::base_font_ref_;
+
+// static
+Font::AdjustFontCallback Font::adjust_font_callback = NULL;
+Font::GetMinimumFontSizeCallback Font::get_minimum_font_size_callback = NULL;
+
+// If the tmWeight field of a TEXTMETRIC structure has a value >= this, the
+// font is bold.
+static const int kTextMetricWeightBold = 700;
+
+// Returns either minimum font allowed for a current locale or
+// lf_height + size_delta value.
+static int AdjustFontSize(int lf_height, int size_delta) {
+  if (lf_height < 0) {
+    lf_height -= size_delta;
+  } else {
+    lf_height += size_delta;
+  }
+  int min_font_size = 0;
+  if (Font::get_minimum_font_size_callback)
+    min_font_size = Font::get_minimum_font_size_callback();
+  // Make sure lf_height is not smaller than allowed min font size for current
+  // locale.
+  if (abs(lf_height) < min_font_size) {
+    return lf_height < 0 ? -min_font_size : min_font_size;
+  } else {
+    return lf_height;
+  }
+}
+
+//
+// Font
+//
+
+Font::Font()
+    : font_ref_(GetBaseFontRef()) {
+}
+
+int Font::height() const {
+  return font_ref_->height();
+}
+
+int Font::baseline() const {
+  return font_ref_->baseline();
+}
+
+int Font::ave_char_width() const {
+  return font_ref_->ave_char_width();
+}
+
+int Font::GetExpectedTextWidth(int length) const {
+  return length * std::min(font_ref_->dlu_base_x(), ave_char_width());
+}
+
+int Font::style() const {
+  return font_ref_->style();
+}
+
+NativeFont Font::nativeFont() const {
+  return hfont();
+}
+
+// static
+Font Font::CreateFont(HFONT font) {
+  DCHECK(font);
+  LOGFONT font_info;
+  GetObject(font, sizeof(LOGFONT), &font_info);
+  return Font(CreateHFontRef(CreateFontIndirect(&font_info)));
+}
+
+Font Font::CreateFont(const std::wstring& font_name, int font_size) {
+  HDC hdc = GetDC(NULL);
+  long lf_height = -MulDiv(font_size, GetDeviceCaps(hdc, LOGPIXELSY), 72);
+  ReleaseDC(NULL, hdc);
+  HFONT hf = ::CreateFont(lf_height, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    font_name.c_str());
+  return Font::CreateFont(hf);
+}
+
+// static
+Font::HFontRef* Font::GetBaseFontRef() {
+  if (base_font_ref_ == NULL) {
+    NONCLIENTMETRICS metrics;
+    win_util::GetNonClientMetrics(&metrics);
+
+    if (adjust_font_callback)
+      adjust_font_callback(&metrics.lfMessageFont);
+    metrics.lfMessageFont.lfHeight =
+        AdjustFontSize(metrics.lfMessageFont.lfHeight, 0);
+    HFONT font = CreateFontIndirect(&metrics.lfMessageFont);
+    DLOG_ASSERT(font);
+    base_font_ref_ = Font::CreateHFontRef(font);
+    // base_font_ref_ is global, up the ref count so it's never deleted.
+    base_font_ref_->AddRef();
+  }
+  return base_font_ref_;
+}
+
+const std::wstring& Font::FontName() const {
+  return font_ref_->font_name();
+}
+
+int Font::FontSize() {
+  LOGFONT font_info;
+  GetObject(hfont(), sizeof(LOGFONT), &font_info);
+  long lf_height = font_info.lfHeight;
+  HDC hdc = GetDC(NULL);
+  int device_caps = GetDeviceCaps(hdc, LOGPIXELSY);
+  int font_size = 0;
+  if (device_caps != 0) {
+    float font_size_float = -static_cast<float>(lf_height)*72/device_caps;
+    font_size = static_cast<int>(::ceil(font_size_float - 0.5));
+  }
+  ReleaseDC(NULL, hdc);
+  return font_size;
+}
+
+Font::HFontRef::HFontRef(HFONT hfont,
+         int height,
+         int baseline,
+         int ave_char_width,
+         int style,
+         int dlu_base_x)
+    : hfont_(hfont),
+      height_(height),
+      baseline_(baseline),
+      ave_char_width_(ave_char_width),
+      style_(style),
+      dlu_base_x_(dlu_base_x) {
+  DLOG_ASSERT(hfont);
+
+  LOGFONT font_info;
+  GetObject(hfont_, sizeof(LOGFONT), &font_info);
+  font_name_ = std::wstring(font_info.lfFaceName);
+}
+
+Font::HFontRef::~HFontRef() {
+  DeleteObject(hfont_);
+}
+
+Font Font::DeriveFont(int size_delta, int style) const {
+  LOGFONT font_info;
+  GetObject(hfont(), sizeof(LOGFONT), &font_info);
+  font_info.lfHeight = AdjustFontSize(font_info.lfHeight, size_delta);
+  font_info.lfUnderline = ((style & UNDERLINED) == UNDERLINED);
+  font_info.lfItalic = ((style & ITALIC) == ITALIC);
+  font_info.lfWeight = (style & BOLD) ? FW_BOLD : FW_NORMAL;
+
+  HFONT hfont = CreateFontIndirect(&font_info);
+  return Font(CreateHFontRef(hfont));
+}
+
+int Font::GetStringWidth(const std::wstring& text) const {
+  int width = 0;
+  HDC dc = GetDC(NULL);
+  HFONT previous_font = static_cast<HFONT>(SelectObject(dc, hfont()));
+  SIZE size;
+  if (GetTextExtentPoint32(dc, text.c_str(), static_cast<int>(text.size()),
+                           &size)) {
+    width = size.cx;
+  } else {
+    width = 0;
+  }
+  SelectObject(dc, previous_font);
+  ReleaseDC(NULL, dc);
+  return width;
+}
+
+Font::HFontRef* Font::CreateHFontRef(HFONT font) {
+  TEXTMETRIC font_metrics;
+  HDC screen_dc = GetDC(NULL);
+  HFONT previous_font = static_cast<HFONT>(SelectObject(screen_dc, font));
+  int last_map_mode = SetMapMode(screen_dc, MM_TEXT);
+  GetTextMetrics(screen_dc, &font_metrics);
+  // Yes, this is how Microsoft recommends calculating the dialog unit
+  // conversions.
+  SIZE ave_text_size;
+  GetTextExtentPoint32(screen_dc,
+                       L"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz",
+                       52, &ave_text_size);
+  const int dlu_base_x = (ave_text_size.cx / 26 + 1) / 2;
+  // To avoid the DC referencing font_handle_, select the previous font.
+  SelectObject(screen_dc, previous_font);
+  SetMapMode(screen_dc, last_map_mode);
+  ReleaseDC(NULL, screen_dc);
+
+  const int height = std::max(1, static_cast<int>(font_metrics.tmHeight));
+  const int baseline = std::max(1, static_cast<int>(font_metrics.tmAscent));
+  const int ave_char_width =
+      std::max(1, static_cast<int>(font_metrics.tmAveCharWidth));
+  int style = 0;
+  if (font_metrics.tmItalic) {
+    style |= Font::ITALIC;
+  }
+  if (font_metrics.tmUnderlined) {
+    style |= Font::UNDERLINED;
+  }
+  if (font_metrics.tmWeight >= kTextMetricWeightBold) {
+    style |= Font::BOLD;
+  }
+
+  return new HFontRef(font, height, baseline, ave_char_width, style,
+                      dlu_base_x);
+}
+
+}  // namespace gfx