| // 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 <dwrite.h> |
| #include <math.h> |
| #include <wchar.h> |
| #include <windows.h> |
| |
| #include <algorithm> |
| |
| #include "base/debug/alias.h" |
| #include "base/logging.h" |
| #include "base/macros.h" |
| #include "base/strings/string16.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_comptr.h" |
| #include "base/win/scoped_gdi_object.h" |
| #include "base/win/scoped_hdc.h" |
| #include "base/win/scoped_select_object.h" |
| #include "base/win/win_util.h" |
| #include "third_party/skia/include/core/SkTypeface.h" |
| #include "ui/gfx/canvas.h" |
| #include "ui/gfx/font.h" |
| #include "ui/gfx/font_render_params.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; |
| } |
| |
| // Returns the family name for the |IDWriteFont| interface passed in. |
| // The family name is returned in the |family_name_ret| parameter. |
| // Returns S_OK on success. |
| // TODO(ananta) |
| // Remove the CHECKs in this function once this stabilizes on the field. |
| HRESULT GetFamilyNameFromDirectWriteFont(IDWriteFont* dwrite_font, |
| base::string16* family_name_ret) { |
| base::win::ScopedComPtr<IDWriteFontFamily> font_family; |
| HRESULT hr = dwrite_font->GetFontFamily(font_family.Receive()); |
| if (FAILED(hr)) |
| CHECK(false); |
| |
| base::win::ScopedComPtr<IDWriteLocalizedStrings> family_name; |
| hr = font_family->GetFamilyNames(family_name.Receive()); |
| if (FAILED(hr)) |
| CHECK(false); |
| |
| // TODO(ananta) |
| // Add support for retrieving the family for the current locale. |
| wchar_t family_name_for_locale[MAX_PATH] = {0}; |
| hr = family_name->GetString(0, |
| family_name_for_locale, |
| arraysize(family_name_for_locale)); |
| if (FAILED(hr)) |
| CHECK(false); |
| |
| *family_name_ret = family_name_for_locale; |
| return hr; |
| } |
| |
| // Uses the GDI interop functionality exposed by DirectWrite to find a |
| // matching DirectWrite font for the LOGFONT passed in. If we fail to |
| // find a direct match then we try the DirectWrite font substitution |
| // route to find a match. |
| // The contents of the LOGFONT pointer |font_info| may be modified on |
| // return. |
| HRESULT FindDirectWriteFontForLOGFONT(IDWriteFactory* factory, |
| LOGFONT* font_info, |
| IDWriteFont** dwrite_font) { |
| base::win::ScopedComPtr<IDWriteGdiInterop> gdi_interop; |
| HRESULT hr = factory->GetGdiInterop(gdi_interop.Receive()); |
| if (FAILED(hr)) { |
| CHECK(false); |
| return hr; |
| } |
| |
| hr = gdi_interop->CreateFontFromLOGFONT(font_info, dwrite_font); |
| if (SUCCEEDED(hr)) |
| return hr; |
| |
| base::win::ScopedComPtr<IDWriteFontCollection> font_collection; |
| hr = factory->GetSystemFontCollection(font_collection.Receive()); |
| if (FAILED(hr)) { |
| CHECK(false); |
| return hr; |
| } |
| |
| // We try to find a matching font by triggering DirectWrite to substitute the |
| // font passed in with a matching font (FontSubstitutes registry key) |
| // If this succeeds we return the matched font. |
| base::win::ScopedGDIObject<HFONT> font(::CreateFontIndirect(font_info)); |
| base::win::ScopedGetDC screen_dc(NULL); |
| base::win::ScopedSelectObject scoped_font(screen_dc, font); |
| |
| base::win::ScopedComPtr<IDWriteFontFace> font_face; |
| hr = gdi_interop->CreateFontFaceFromHdc(screen_dc, font_face.Receive()); |
| if (FAILED(hr)) |
| return hr; |
| |
| LOGFONT converted_font = {0}; |
| hr = gdi_interop->ConvertFontFaceToLOGFONT(font_face.get(), &converted_font); |
| if (SUCCEEDED(hr)) { |
| hr = font_collection->GetFontFromFontFace(font_face.get(), dwrite_font); |
| if (SUCCEEDED(hr)) { |
| wcscpy_s(font_info->lfFaceName, arraysize(font_info->lfFaceName), |
| converted_font.lfFaceName); |
| } |
| } |
| return hr; |
| } |
| |
| // Returns a matching IDWriteFont for the |font_info| passed in. If we fail |
| // to find a matching font, then we return the IDWriteFont corresponding to |
| // the default font on the system. |
| // Returns S_OK on success. |
| // The contents of the LOGFONT pointer |font_info| may be modified on |
| // return. |
| HRESULT GetMatchingDirectWriteFont(LOGFONT* font_info, |
| int font_style, |
| IDWriteFactory* factory, |
| IDWriteFont** dwrite_font) { |
| // First try the GDI compat route to get a matching DirectWrite font. |
| // If that succeeds then we are good. If that fails then try and find a |
| // match from the DirectWrite font collection. |
| HRESULT hr = FindDirectWriteFontForLOGFONT(factory, font_info, dwrite_font); |
| if (SUCCEEDED(hr)) |
| return hr; |
| |
| // Get a matching font from the system font collection exposed by |
| // DirectWrite. |
| base::win::ScopedComPtr<IDWriteFontCollection> font_collection; |
| hr = factory->GetSystemFontCollection(font_collection.Receive()); |
| if (FAILED(hr)) { |
| CHECK(false); |
| return hr; |
| } |
| |
| // Steps as below:- |
| // This mirrors skia. |
| // 1. Attempt to find a DirectWrite font family based on the face name in the |
| // font. That may not work at all times, as the face name could be random |
| // GDI has its own font system where in it creates a font matching the |
| // characteristics in the LOGFONT structure passed into |
| // CreateFontIndirect. DirectWrite does not do that. If this succeeds then |
| // return the matching IDWriteFont from the family. |
| // 2. If step 1 fails then repeat with the default system font. This has the |
| // same limitations with the face name as mentioned above. |
| // 3. If step 2 fails then return the first family from the collection and |
| // use that. |
| base::win::ScopedComPtr<IDWriteFontFamily> font_family; |
| BOOL exists = FALSE; |
| uint32 index = 0; |
| hr = font_collection->FindFamilyName(font_info->lfFaceName, &index, &exists); |
| // If we fail to find a match then try fallback to the default font on the |
| // system. This is what skia does as well. |
| if (FAILED(hr) || (index == UINT_MAX) || !exists) { |
| NONCLIENTMETRICS metrics = {0}; |
| metrics.cbSize = sizeof(metrics); |
| if (!SystemParametersInfoW(SPI_GETNONCLIENTMETRICS, |
| sizeof(metrics), |
| &metrics, |
| 0)) { |
| CHECK(false); |
| return E_FAIL; |
| } |
| |
| if (wcsncmp(font_info->lfFaceName, metrics.lfMessageFont.lfFaceName, |
| arraysize(font_info->lfFaceName))) { |
| // First try the GDI compat route to get a matching DirectWrite font. If |
| // that succeeds we are good. If not find a matching font from the font |
| // collection. |
| wcscpy_s(font_info->lfFaceName, arraysize(font_info->lfFaceName), |
| metrics.lfMessageFont.lfFaceName); |
| hr = FindDirectWriteFontForLOGFONT(factory, font_info, dwrite_font); |
| if (SUCCEEDED(hr)) |
| return hr; |
| |
| // Best effort to find a matching font from the system font collection. |
| hr = font_collection->FindFamilyName(metrics.lfMessageFont.lfFaceName, |
| &index, |
| &exists); |
| } |
| } |
| |
| if (index != UINT_MAX && exists) { |
| hr = font_collection->GetFontFamily(index, font_family.Receive()); |
| } else { |
| // If we fail to find a matching font, then fallback to the first font in |
| // the list. This is what skia does as well. |
| hr = font_collection->GetFontFamily(0, font_family.Receive()); |
| } |
| |
| if (FAILED(hr)) { |
| CHECK(false); |
| return hr; |
| } |
| |
| DWRITE_FONT_WEIGHT weight = (font_style & SkTypeface::kBold) |
| ? DWRITE_FONT_WEIGHT_BOLD |
| : DWRITE_FONT_WEIGHT_NORMAL; |
| DWRITE_FONT_STRETCH stretch = DWRITE_FONT_STRETCH_NORMAL; |
| DWRITE_FONT_STYLE italic = (font_style & SkTypeface::kItalic) |
| ? DWRITE_FONT_STYLE_ITALIC |
| : DWRITE_FONT_STYLE_NORMAL; |
| |
| // The IDWriteFontFamily::GetFirstMatchingFont call fails on certain machines |
| // for fonts like MS UI Gothic, Segoe UI, etc. It is not clear why these |
| // fonts could be accessible to GDI and not to DirectWrite. |
| // The code below adds some debug fields to help track down these failures. |
| // 1. We get the matching font list for the font attributes passed in. |
| // 2. We get the font count in the family with a debug alias variable. |
| // 3. If GetFirstMatchingFont fails then we CHECK as before. |
| // Next step would be to remove the CHECKs in this function and fallback to |
| // GDI. |
| // http://crbug.com/434425 |
| // TODO(ananta) |
| // Remove the GetMatchingFonts and related code here once we get to a stable |
| // state in canary. |
| base::win::ScopedComPtr<IDWriteFontList> matching_font_list; |
| hr = font_family->GetMatchingFonts(weight, stretch, italic, |
| matching_font_list.Receive()); |
| uint32 matching_font_count = 0; |
| if (SUCCEEDED(hr)) |
| matching_font_count = matching_font_list->GetFontCount(); |
| |
| hr = font_family->GetFirstMatchingFont(weight, stretch, italic, |
| dwrite_font); |
| if (FAILED(hr)) { |
| base::debug::Alias(&matching_font_count); |
| CHECK(false); |
| } |
| |
| base::string16 font_name; |
| GetFamilyNameFromDirectWriteFont(*dwrite_font, &font_name); |
| wcscpy_s(font_info->lfFaceName, arraysize(font_info->lfFaceName), |
| font_name.c_str()); |
| return hr; |
| } |
| |
| } // namespace |
| |
| namespace gfx { |
| |
| // static |
| PlatformFontWin::HFontRef* PlatformFontWin::base_font_ref_; |
| |
| // static |
| PlatformFontWin::AdjustFontCallback |
| PlatformFontWin::adjust_font_callback = nullptr; |
| PlatformFontWin::GetMinimumFontSizeCallback |
| PlatformFontWin::get_minimum_font_size_callback = NULL; |
| |
| IDWriteFactory* PlatformFontWin::direct_write_factory_ = nullptr; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // 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); |
| |
| // Create a font with a height near that of the target height. |
| LOGFONT font_info; |
| GetObject(GetNativeFont(), sizeof(LOGFONT), &font_info); |
| font_info.lfHeight = height; |
| SetLogFontStyle(style, &font_info); |
| |
| HFONT hfont = CreateFontIndirect(&font_info); |
| Font font(new PlatformFontWin(CreateHFontRef(hfont))); |
| |
| // Respect the minimum font size constraint. |
| const int min_font_size = GetMinimumFontSize(); |
| |
| // Used to avoid shrinking the font and expanding it. |
| bool ran_shrink_loop = false; |
| |
| // Iterate to find the largest font with a height <= |height|. |
| while ((font.GetHeight() > height) && |
| (font.GetFontSize() >= min_font_size)) { |
| ran_shrink_loop = true; |
| Font derived_font = font.Derive(-1, style); |
| // Break the loop if the derived font is too small or hasn't shrunk at all. |
| if ((derived_font.GetFontSize() < min_font_size) || |
| ((derived_font.GetFontSize() == font.GetFontSize()) && |
| (derived_font.GetHeight() == font.GetHeight()))) |
| break; |
| font = derived_font; |
| } |
| |
| while ((!ran_shrink_loop && font.GetHeight() <= height) || |
| (font.GetFontSize() < min_font_size)) { |
| Font derived_font = font.Derive(1, style); |
| // Break the loop if the derived font is too large or hasn't grown at all. |
| if (((derived_font.GetHeight() > height) && |
| (font.GetFontSize() >= min_font_size)) || |
| ((derived_font.GetFontSize() == font.GetFontSize()) && |
| (derived_font.GetHeight() == font.GetHeight()))) |
| break; |
| font = derived_font; |
| } |
| return font; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // 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::GetExpectedTextWidth(int length) const { |
| return length * std::min(font_ref_->GetDluBaseX(), |
| font_ref_->ave_char_width()); |
| } |
| |
| 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.Get(), font_ref_->hfont()); |
| wchar_t localized_font_name[LF_FACESIZE]; |
| int length = GetTextFace(memory_dc.Get(), 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(); |
| } |
| |
| const FontRenderParams& PlatformFontWin::GetFontRenderParams() { |
| CR_DEFINE_STATIC_LOCAL(const gfx::FontRenderParams, params, |
| (gfx::GetFontRenderParams(gfx::FontRenderParamsQuery(), NULL))); |
| return params; |
| } |
| |
| NativeFont PlatformFontWin::GetNativeFont() const { |
| return font_ref_->hfont(); |
| } |
| |
| // static |
| void PlatformFontWin::SetDirectWriteFactory(IDWriteFactory* factory) { |
| // We grab a reference on the DirectWrite factory. This reference is |
| // leaked, which is ok because skia leaks it as well. |
| factory->AddRef(); |
| direct_write_factory_ = factory; |
| } |
| |
| // static |
| void PlatformFontWin::GetTextMetricsForFont(HDC hdc, |
| HFONT font, |
| TEXTMETRIC* text_metrics) { |
| base::win::ScopedSelectObject scoped_font(hdc, font); |
| GetTextMetrics(hdc, text_metrics); |
| } |
| |
| // static |
| int PlatformFontWin::GetFontSize(const LOGFONT& font_info) { |
| if (font_info.lfHeight < 0) |
| return -font_info.lfHeight; |
| |
| base::win::ScopedGetDC screen_dc(NULL); |
| base::win::ScopedGDIObject<HFONT> font(CreateFontIndirect(&font_info)); |
| |
| TEXTMETRIC font_metrics = {0}; |
| PlatformFontWin::GetTextMetricsForFont(screen_dc, font, &font_metrics); |
| return font_metrics.tmAscent; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // 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, FW_DONTCARE, FALSE, FALSE, FALSE, |
| DEFAULT_CHARSET, |
| OUT_DEFAULT_PRECIS, |
| CLIP_DEFAULT_PRECIS, |
| DEFAULT_QUALITY, |
| DEFAULT_PITCH | FF_DONTCARE, |
| base::UTF8ToUTF16(font_name).c_str()); |
| font_ref_ = CreateHFontRef(hf); |
| } |
| |
| // static |
| PlatformFontWin::HFontRef* PlatformFontWin::GetBaseFontRef() { |
| if (base_font_ref_ == NULL) { |
| NONCLIENTMETRICS_XP 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); |
| gfx::ScopedSetMapMode mode(screen_dc, MM_TEXT); |
| GetTextMetricsForFont(screen_dc, font, &font_metrics); |
| } |
| |
| if (direct_write_factory_) |
| return CreateHFontRefFromSkia(font, font_metrics); |
| |
| return CreateHFontRefFromGDI(font, font_metrics); |
| } |
| |
| PlatformFontWin::HFontRef* PlatformFontWin::CreateHFontRefFromGDI( |
| HFONT font, |
| const TEXTMETRIC& 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); |
| } |
| |
| // static |
| PlatformFontWin::HFontRef* PlatformFontWin::CreateHFontRefFromSkia( |
| HFONT gdi_font, |
| const TEXTMETRIC& font_metrics) { |
| LOGFONT font_info = {0}; |
| GetObject(gdi_font, sizeof(LOGFONT), &font_info); |
| |
| // If the font height is passed in as 0, assume the height to be -1 to ensure |
| // that we return the metrics for a 1 point font. |
| // If the font height is positive it represents the rasterized font's cell |
| // height. Calculate the actual height accordingly. |
| if (font_info.lfHeight > 0) { |
| font_info.lfHeight = |
| font_metrics.tmInternalLeading - font_metrics.tmHeight; |
| } else if (font_info.lfHeight == 0) { |
| font_info.lfHeight = -1; |
| } |
| |
| int skia_style = SkTypeface::kNormal; |
| if (font_info.lfWeight >= FW_SEMIBOLD && |
| font_info.lfWeight <= FW_ULTRABOLD) { |
| skia_style |= SkTypeface::kBold; |
| } |
| if (font_info.lfItalic) |
| skia_style |= SkTypeface::kItalic; |
| |
| // Skia does not return all values we need for font metrics. For e.g. |
| // the cap height which indicates the height of capital letters is not |
| // returned even though it is returned by DirectWrite. |
| // TODO(ananta) |
| // Fix SkScalerContext_win_dw.cpp to return all metrics we need from |
| // DirectWrite and remove the code here which retrieves metrics from |
| // DirectWrite to calculate the cap height. |
| base::win::ScopedComPtr<IDWriteFont> dwrite_font; |
| HRESULT hr = GetMatchingDirectWriteFont(&font_info, |
| skia_style, |
| direct_write_factory_, |
| dwrite_font.Receive()); |
| if (FAILED(hr)) { |
| CHECK(false); |
| return nullptr; |
| } |
| |
| DWRITE_FONT_METRICS dwrite_font_metrics = {0}; |
| dwrite_font->GetMetrics(&dwrite_font_metrics); |
| |
| skia::RefPtr<SkTypeface> skia_face = skia::AdoptRef( |
| SkTypeface::CreateFromName( |
| base::SysWideToUTF8(font_info.lfFaceName).c_str(), |
| static_cast<SkTypeface::Style>(skia_style))); |
| |
| gfx::FontRenderParams font_params = |
| gfx::GetFontRenderParams(gfx::FontRenderParamsQuery(), nullptr); |
| SkFontHost::SetSubpixelOrder( |
| gfx::FontRenderParams::SubpixelRenderingToSkiaLCDOrder( |
| font_params.subpixel_rendering)); |
| SkFontHost::SetSubpixelOrientation( |
| gfx::FontRenderParams::SubpixelRenderingToSkiaLCDOrientation( |
| font_params.subpixel_rendering)); |
| |
| SkPaint paint; |
| paint.setAntiAlias(font_params.antialiasing); |
| paint.setTypeface(skia_face.get()); |
| paint.setTextSize(-font_info.lfHeight); |
| SkPaint::FontMetrics skia_metrics; |
| paint.getFontMetrics(&skia_metrics); |
| |
| // The calculations below are similar to those in the CreateHFontRef |
| // function. The height, baseline and cap height are rounded up to ensure |
| // that they match up closely with GDI. |
| const int height = std::ceil(skia_metrics.fDescent - skia_metrics.fAscent); |
| const int baseline = std::max<int>(1, std::ceil(-skia_metrics.fAscent)); |
| const int cap_height = std::ceil(paint.getTextSize() * |
| static_cast<double>(dwrite_font_metrics.capHeight) / |
| dwrite_font_metrics.designUnitsPerEm); |
| |
| // The metrics retrieved from skia don't have the average character width. In |
| // any case if we get the average character width from skia then use that or |
| // the average character width in the TEXTMETRIC structure. |
| // TODO(ananta): Investigate whether it is possible to retrieve this value |
| // from DirectWrite. |
| const int ave_char_width = |
| skia_metrics.fAvgCharWidth == 0 ? font_metrics.tmAveCharWidth |
| : skia_metrics.fAvgCharWidth; |
| |
| int style = 0; |
| if (skia_style & SkTypeface::kItalic) |
| style |= Font::ITALIC; |
| if (font_info.lfUnderline) |
| style |= Font::UNDERLINE; |
| if (font_info.lfWeight >= kTextMetricWeightBold) |
| style |= Font::BOLD; |
| |
| // DirectWrite may have substituted the GDI font name with a fallback |
| // font. Ensure that it is updated here. |
| DeleteObject(gdi_font); |
| gdi_font = ::CreateFontIndirect(&font_info); |
| return new HFontRef(gdi_font, -font_info.lfHeight, height, baseline, |
| cap_height, ave_char_width, style); |
| } |
| |
| PlatformFontWin::PlatformFontWin(HFontRef* hfont_ref) : font_ref_(hfont_ref) { |
| } |
| |
| PlatformFontWin::~PlatformFontWin() { |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // 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_ = base::UTF16ToUTF8(base::string16(font_info.lfFaceName)); |
| |
| // Retrieve the font size from the GetTextMetrics API instead of referencing |
| // it from the LOGFONT structure. This is because the height as reported by |
| // the LOGFONT structure is not always correct. For small fonts with size 1 |
| // the LOGFONT structure reports the height as -1, while the actual font size |
| // is different. (2 on my XP machine). |
| base::win::ScopedGetDC screen_dc(NULL); |
| TEXTMETRIC font_metrics = {0}; |
| PlatformFontWin::GetTextMetricsForFont(screen_dc, hfont_, &font_metrics); |
| requested_font_size_ = font_metrics.tmHeight - font_metrics.tmInternalLeading; |
| } |
| |
| int PlatformFontWin::HFontRef::GetDluBaseX() { |
| if (dlu_base_x_ != -1) |
| return dlu_base_x_; |
| |
| dlu_base_x_ = GetAverageCharWidthInDialogUnits(hfont_); |
| return dlu_base_x_; |
| } |
| |
| // static |
| int PlatformFontWin::HFontRef::GetAverageCharWidthInDialogUnits( |
| HFONT gdi_font) { |
| base::win::ScopedGetDC screen_dc(NULL); |
| base::win::ScopedSelectObject font(screen_dc, gdi_font); |
| 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); |
| int 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 |