| // Copyright (c) 2012 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 "ui/gfx/platform_font_win.h" |
| |
| #include <windows.h> |
| #include <math.h> |
| |
| #include <algorithm> |
| #include <string> |
| |
| #include "base/logging.h" |
| #include "base/strings/string_util.h" |
| #include "base/strings/sys_string_conversions.h" |
| #include "base/strings/utf_string_conversions.h" |
| #include "base/win/scoped_hdc.h" |
| #include "base/win/scoped_select_object.h" |
| #include "base/win/win_util.h" |
| #include "ui/gfx/canvas.h" |
| #include "ui/gfx/font.h" |
| #include "ui/gfx/win/scoped_set_map_mode.h" |
| |
| namespace { |
| |
| // If the tmWeight field of a TEXTMETRIC structure has a value >= this, the |
| // font is bold. |
| const int kTextMetricWeightBold = 700; |
| |
| // Returns the minimum font size, using the minimum size callback, if set. |
| int GetMinimumFontSize() { |
| int min_font_size = 0; |
| if (gfx::PlatformFontWin::get_minimum_font_size_callback) |
| min_font_size = gfx::PlatformFontWin::get_minimum_font_size_callback(); |
| return min_font_size; |
| } |
| |
| // Returns either minimum font allowed for a current locale or |
| // lf_height + size_delta value. |
| int AdjustFontSize(int lf_height, int size_delta) { |
| if (lf_height < 0) { |
| lf_height -= size_delta; |
| } else { |
| lf_height += size_delta; |
| } |
| const int min_font_size = GetMinimumFontSize(); |
| // 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; |
| } |
| } |
| |
| // Sets style properties on |font_info| based on |font_style|. |
| void SetLogFontStyle(int font_style, LOGFONT* font_info) { |
| font_info->lfUnderline = (font_style & gfx::Font::UNDERLINE) != 0; |
| font_info->lfItalic = (font_style & gfx::Font::ITALIC) != 0; |
| font_info->lfWeight = (font_style & gfx::Font::BOLD) ? FW_BOLD : FW_NORMAL; |
| } |
| |
| } // namespace |
| |
| namespace gfx { |
| |
| // static |
| PlatformFontWin::HFontRef* PlatformFontWin::base_font_ref_; |
| |
| // static |
| PlatformFontWin::AdjustFontCallback |
| PlatformFontWin::adjust_font_callback = NULL; |
| PlatformFontWin::GetMinimumFontSizeCallback |
| PlatformFontWin::get_minimum_font_size_callback = NULL; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // PlatformFontWin, public |
| |
| PlatformFontWin::PlatformFontWin() : font_ref_(GetBaseFontRef()) { |
| } |
| |
| PlatformFontWin::PlatformFontWin(NativeFont native_font) { |
| InitWithCopyOfHFONT(native_font); |
| } |
| |
| PlatformFontWin::PlatformFontWin(const std::string& font_name, |
| int font_size) { |
| InitWithFontNameAndSize(font_name, font_size); |
| } |
| |
| Font PlatformFontWin::DeriveFontWithHeight(int height, int style) { |
| DCHECK_GE(height, 0); |
| if (GetHeight() == height && GetStyle() == style) |
| return Font(this); |
| |
| // CreateFontIndirect() doesn't return the largest size for the given height |
| // when decreasing the height. Iterate to find it. |
| if (GetHeight() > height) { |
| const int min_font_size = GetMinimumFontSize(); |
| Font font = DeriveFont(-1, style); |
| int font_height = font.GetHeight(); |
| int font_size = font.GetFontSize(); |
| while (font_height > height && font_size != min_font_size) { |
| font = font.DeriveFont(-1, style); |
| if (font_height == font.GetHeight() && font_size == font.GetFontSize()) |
| break; |
| font_height = font.GetHeight(); |
| font_size = font.GetFontSize(); |
| } |
| return font; |
| } |
| |
| LOGFONT font_info; |
| GetObject(GetNativeFont(), sizeof(LOGFONT), &font_info); |
| font_info.lfHeight = height; |
| SetLogFontStyle(style, &font_info); |
| |
| HFONT hfont = CreateFontIndirect(&font_info); |
| return Font(new PlatformFontWin(CreateHFontRef(hfont))); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // PlatformFontWin, PlatformFont implementation: |
| |
| Font PlatformFontWin::DeriveFont(int size_delta, int style) const { |
| LOGFONT font_info; |
| GetObject(GetNativeFont(), sizeof(LOGFONT), &font_info); |
| const int requested_font_size = font_ref_->requested_font_size(); |
| font_info.lfHeight = AdjustFontSize(-requested_font_size, size_delta); |
| SetLogFontStyle(style, &font_info); |
| |
| HFONT hfont = CreateFontIndirect(&font_info); |
| return Font(new PlatformFontWin(CreateHFontRef(hfont))); |
| } |
| |
| int PlatformFontWin::GetHeight() const { |
| return font_ref_->height(); |
| } |
| |
| int PlatformFontWin::GetBaseline() const { |
| return font_ref_->baseline(); |
| } |
| |
| int PlatformFontWin::GetCapHeight() const { |
| return font_ref_->cap_height(); |
| } |
| |
| int PlatformFontWin::GetAverageCharacterWidth() const { |
| return font_ref_->ave_char_width(); |
| } |
| |
| int PlatformFontWin::GetStringWidth(const base::string16& text) const { |
| return Canvas::GetStringWidth(text, |
| Font(const_cast<PlatformFontWin*>(this))); |
| } |
| |
| int PlatformFontWin::GetExpectedTextWidth(int length) const { |
| return length * std::min(font_ref_->GetDluBaseX(), |
| GetAverageCharacterWidth()); |
| } |
| |
| int PlatformFontWin::GetStyle() const { |
| return font_ref_->style(); |
| } |
| |
| std::string PlatformFontWin::GetFontName() const { |
| return font_ref_->font_name(); |
| } |
| |
| std::string PlatformFontWin::GetActualFontNameForTesting() const { |
| // With the current implementation on Windows, HFontRef::font_name() returns |
| // the font name taken from the HFONT handle, but it's not the name that comes |
| // from the font's metadata. See http://crbug.com/327287 |
| return font_ref_->font_name(); |
| } |
| |
| std::string PlatformFontWin::GetLocalizedFontName() const { |
| base::win::ScopedCreateDC memory_dc(CreateCompatibleDC(NULL)); |
| if (!memory_dc.Get()) |
| return GetFontName(); |
| |
| // When a font has a localized name for a language matching the system |
| // locale, GetTextFace() returns the localized name. |
| base::win::ScopedSelectObject font(memory_dc, font_ref_->hfont()); |
| wchar_t localized_font_name[LF_FACESIZE]; |
| int length = GetTextFace(memory_dc, arraysize(localized_font_name), |
| &localized_font_name[0]); |
| if (length <= 0) |
| return GetFontName(); |
| return base::SysWideToUTF8(localized_font_name); |
| } |
| |
| int PlatformFontWin::GetFontSize() const { |
| return font_ref_->font_size(); |
| } |
| |
| NativeFont PlatformFontWin::GetNativeFont() const { |
| return font_ref_->hfont(); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Font, private: |
| |
| void PlatformFontWin::InitWithCopyOfHFONT(HFONT hfont) { |
| DCHECK(hfont); |
| LOGFONT font_info; |
| GetObject(hfont, sizeof(LOGFONT), &font_info); |
| font_ref_ = CreateHFontRef(CreateFontIndirect(&font_info)); |
| } |
| |
| void PlatformFontWin::InitWithFontNameAndSize(const std::string& font_name, |
| int font_size) { |
| HFONT hf = ::CreateFont(-font_size, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| UTF8ToUTF16(font_name).c_str()); |
| font_ref_ = CreateHFontRef(hf); |
| } |
| |
| // static |
| PlatformFontWin::HFontRef* PlatformFontWin::GetBaseFontRef() { |
| if (base_font_ref_ == NULL) { |
| NONCLIENTMETRICS metrics; |
| base::win::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_ = PlatformFontWin::CreateHFontRef(font); |
| // base_font_ref_ is global, up the ref count so it's never deleted. |
| base_font_ref_->AddRef(); |
| } |
| return base_font_ref_; |
| } |
| |
| PlatformFontWin::HFontRef* PlatformFontWin::CreateHFontRef(HFONT font) { |
| TEXTMETRIC font_metrics; |
| |
| { |
| base::win::ScopedGetDC screen_dc(NULL); |
| base::win::ScopedSelectObject scoped_font(screen_dc, font); |
| gfx::ScopedSetMapMode mode(screen_dc, MM_TEXT); |
| GetTextMetrics(screen_dc, &font_metrics); |
| } |
| |
| const int height = std::max<int>(1, font_metrics.tmHeight); |
| const int baseline = std::max<int>(1, font_metrics.tmAscent); |
| const int cap_height = |
| std::max<int>(1, font_metrics.tmAscent - font_metrics.tmInternalLeading); |
| const int ave_char_width = std::max<int>(1, font_metrics.tmAveCharWidth); |
| const int font_size = |
| std::max<int>(1, font_metrics.tmHeight - font_metrics.tmInternalLeading); |
| int style = 0; |
| if (font_metrics.tmItalic) |
| style |= Font::ITALIC; |
| if (font_metrics.tmUnderlined) |
| style |= Font::UNDERLINE; |
| if (font_metrics.tmWeight >= kTextMetricWeightBold) |
| style |= Font::BOLD; |
| |
| return new HFontRef(font, font_size, height, baseline, cap_height, |
| ave_char_width, style); |
| } |
| |
| PlatformFontWin::PlatformFontWin(HFontRef* hfont_ref) : font_ref_(hfont_ref) { |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // PlatformFontWin::HFontRef: |
| |
| PlatformFontWin::HFontRef::HFontRef(HFONT hfont, |
| int font_size, |
| int height, |
| int baseline, |
| int cap_height, |
| int ave_char_width, |
| int style) |
| : hfont_(hfont), |
| font_size_(font_size), |
| height_(height), |
| baseline_(baseline), |
| cap_height_(cap_height), |
| ave_char_width_(ave_char_width), |
| style_(style), |
| dlu_base_x_(-1), |
| requested_font_size_(font_size) { |
| DLOG_ASSERT(hfont); |
| |
| LOGFONT font_info; |
| GetObject(hfont_, sizeof(LOGFONT), &font_info); |
| font_name_ = UTF16ToUTF8(base::string16(font_info.lfFaceName)); |
| if (font_info.lfHeight < 0) |
| requested_font_size_ = -font_info.lfHeight; |
| } |
| |
| int PlatformFontWin::HFontRef::GetDluBaseX() { |
| if (dlu_base_x_ != -1) |
| return dlu_base_x_; |
| |
| base::win::ScopedGetDC screen_dc(NULL); |
| base::win::ScopedSelectObject font(screen_dc, hfont_); |
| gfx::ScopedSetMapMode mode(screen_dc, MM_TEXT); |
| |
| // Yes, this is how Microsoft recommends calculating the dialog unit |
| // conversions. See: http://support.microsoft.com/kb/125681 |
| SIZE ave_text_size; |
| GetTextExtentPoint32(screen_dc, |
| L"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", |
| 52, &ave_text_size); |
| dlu_base_x_ = (ave_text_size.cx / 26 + 1) / 2; |
| |
| DCHECK_NE(dlu_base_x_, -1); |
| return dlu_base_x_; |
| } |
| |
| PlatformFontWin::HFontRef::~HFontRef() { |
| DeleteObject(hfont_); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // PlatformFont, public: |
| |
| // static |
| PlatformFont* PlatformFont::CreateDefault() { |
| return new PlatformFontWin; |
| } |
| |
| // static |
| PlatformFont* PlatformFont::CreateFromNativeFont(NativeFont native_font) { |
| return new PlatformFontWin(native_font); |
| } |
| |
| // static |
| PlatformFont* PlatformFont::CreateFromNameAndSize(const std::string& font_name, |
| int font_size) { |
| return new PlatformFontWin(font_name, font_size); |
| } |
| |
| } // namespace gfx |