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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "gfx/platform_font_win.h" | |
| 6 | |
| 7 #include <windows.h> | |
| 8 #include <math.h> | |
| 9 | |
| 10 #include <algorithm> | |
| 11 | |
| 12 #include "base/logging.h" | |
| 13 #include "base/string_util.h" | |
| 14 #include "base/utf_string_conversions.h" | |
| 15 #include "base/win/win_util.h" | |
| 16 #include "gfx/canvas_skia.h" | |
| 17 #include "gfx/font.h" | |
| 18 | |
| 19 namespace { | |
| 20 | |
| 21 // If the tmWeight field of a TEXTMETRIC structure has a value >= this, the | |
| 22 // font is bold. | |
| 23 const int kTextMetricWeightBold = 700; | |
| 24 | |
| 25 // Returns either minimum font allowed for a current locale or | |
| 26 // lf_height + size_delta value. | |
| 27 int AdjustFontSize(int lf_height, int size_delta) { | |
| 28 if (lf_height < 0) { | |
| 29 lf_height -= size_delta; | |
| 30 } else { | |
| 31 lf_height += size_delta; | |
| 32 } | |
| 33 int min_font_size = 0; | |
| 34 if (gfx::PlatformFontWin::get_minimum_font_size_callback) | |
| 35 min_font_size = gfx::PlatformFontWin::get_minimum_font_size_callback(); | |
| 36 // Make sure lf_height is not smaller than allowed min font size for current | |
| 37 // locale. | |
| 38 if (abs(lf_height) < min_font_size) { | |
| 39 return lf_height < 0 ? -min_font_size : min_font_size; | |
| 40 } else { | |
| 41 return lf_height; | |
| 42 } | |
| 43 } | |
| 44 | |
| 45 } // namespace | |
| 46 | |
| 47 namespace gfx { | |
| 48 | |
| 49 // static | |
| 50 PlatformFontWin::HFontRef* PlatformFontWin::base_font_ref_; | |
| 51 | |
| 52 // static | |
| 53 PlatformFontWin::AdjustFontCallback | |
| 54 PlatformFontWin::adjust_font_callback = NULL; | |
| 55 PlatformFontWin::GetMinimumFontSizeCallback | |
| 56 PlatformFontWin::get_minimum_font_size_callback = NULL; | |
| 57 | |
| 58 //////////////////////////////////////////////////////////////////////////////// | |
| 59 // PlatformFontWin, public | |
| 60 | |
| 61 PlatformFontWin::PlatformFontWin() : font_ref_(GetBaseFontRef()) { | |
| 62 } | |
| 63 | |
| 64 PlatformFontWin::PlatformFontWin(const Font& other) { | |
| 65 InitWithCopyOfHFONT(other.GetNativeFont()); | |
| 66 } | |
| 67 | |
| 68 PlatformFontWin::PlatformFontWin(NativeFont native_font) { | |
| 69 InitWithCopyOfHFONT(native_font); | |
| 70 } | |
| 71 | |
| 72 PlatformFontWin::PlatformFontWin(const string16& font_name, | |
| 73 int font_size) { | |
| 74 InitWithFontNameAndSize(font_name, font_size); | |
| 75 } | |
| 76 | |
| 77 //////////////////////////////////////////////////////////////////////////////// | |
| 78 // PlatformFontWin, PlatformFont implementation: | |
| 79 | |
| 80 Font PlatformFontWin::DeriveFont(int size_delta, int style) const { | |
| 81 LOGFONT font_info; | |
| 82 GetObject(GetNativeFont(), sizeof(LOGFONT), &font_info); | |
| 83 font_info.lfHeight = AdjustFontSize(font_info.lfHeight, size_delta); | |
| 84 font_info.lfUnderline = | |
| 85 ((style & gfx::Font::UNDERLINED) == gfx::Font::UNDERLINED); | |
| 86 font_info.lfItalic = ((style & gfx::Font::ITALIC) == gfx::Font::ITALIC); | |
| 87 font_info.lfWeight = (style & gfx::Font::BOLD) ? FW_BOLD : FW_NORMAL; | |
| 88 | |
| 89 HFONT hfont = CreateFontIndirect(&font_info); | |
| 90 return Font(new PlatformFontWin(CreateHFontRef(hfont))); | |
| 91 } | |
| 92 | |
| 93 int PlatformFontWin::GetHeight() const { | |
| 94 return font_ref_->height(); | |
| 95 } | |
| 96 | |
| 97 int PlatformFontWin::GetBaseline() const { | |
| 98 return font_ref_->baseline(); | |
| 99 } | |
| 100 | |
| 101 int PlatformFontWin::GetAverageCharacterWidth() const { | |
| 102 return font_ref_->ave_char_width(); | |
| 103 } | |
| 104 | |
| 105 int PlatformFontWin::GetStringWidth(const string16& text) const { | |
| 106 int width = 0, height = 0; | |
| 107 CanvasSkia::SizeStringInt(text, Font(const_cast<PlatformFontWin*>(this)), | |
| 108 &width, &height, gfx::Canvas::NO_ELLIPSIS); | |
| 109 return width; | |
| 110 } | |
| 111 | |
| 112 int PlatformFontWin::GetExpectedTextWidth(int length) const { | |
| 113 return length * std::min(font_ref_->dlu_base_x(), GetAverageCharacterWidth()); | |
| 114 } | |
| 115 | |
| 116 int PlatformFontWin::GetStyle() const { | |
| 117 return font_ref_->style(); | |
| 118 } | |
| 119 | |
| 120 string16 PlatformFontWin::GetFontName() const { | |
| 121 return font_ref_->font_name(); | |
| 122 } | |
| 123 | |
| 124 int PlatformFontWin::GetFontSize() const { | |
| 125 LOGFONT font_info; | |
| 126 GetObject(font_ref_->hfont(), sizeof(LOGFONT), &font_info); | |
| 127 long lf_height = font_info.lfHeight; | |
| 128 HDC hdc = GetDC(NULL); | |
| 129 int device_caps = GetDeviceCaps(hdc, LOGPIXELSY); | |
| 130 int font_size = 0; | |
| 131 if (device_caps != 0) { | |
| 132 float font_size_float = -static_cast<float>(lf_height)*72/device_caps; | |
| 133 font_size = static_cast<int>(::ceil(font_size_float - 0.5)); | |
| 134 } | |
| 135 ReleaseDC(NULL, hdc); | |
| 136 return font_size; | |
| 137 } | |
| 138 | |
| 139 NativeFont PlatformFontWin::GetNativeFont() const { | |
| 140 return font_ref_->hfont(); | |
| 141 } | |
| 142 | |
| 143 //////////////////////////////////////////////////////////////////////////////// | |
| 144 // Font, private: | |
| 145 | |
| 146 void PlatformFontWin::InitWithCopyOfHFONT(HFONT hfont) { | |
| 147 DCHECK(hfont); | |
| 148 LOGFONT font_info; | |
| 149 GetObject(hfont, sizeof(LOGFONT), &font_info); | |
| 150 font_ref_ = CreateHFontRef(CreateFontIndirect(&font_info)); | |
| 151 } | |
| 152 | |
| 153 void PlatformFontWin::InitWithFontNameAndSize(const string16& font_name, | |
| 154 int font_size) { | |
| 155 HDC hdc = GetDC(NULL); | |
| 156 long lf_height = -MulDiv(font_size, GetDeviceCaps(hdc, LOGPIXELSY), 72); | |
| 157 ReleaseDC(NULL, hdc); | |
| 158 HFONT hf = ::CreateFont(lf_height, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
| 159 font_name.c_str()); | |
| 160 font_ref_ = CreateHFontRef(hf); | |
| 161 } | |
| 162 | |
| 163 // static | |
| 164 PlatformFontWin::HFontRef* PlatformFontWin::GetBaseFontRef() { | |
| 165 if (base_font_ref_ == NULL) { | |
| 166 NONCLIENTMETRICS metrics; | |
| 167 base::win::GetNonClientMetrics(&metrics); | |
| 168 | |
| 169 if (adjust_font_callback) | |
| 170 adjust_font_callback(&metrics.lfMessageFont); | |
| 171 metrics.lfMessageFont.lfHeight = | |
| 172 AdjustFontSize(metrics.lfMessageFont.lfHeight, 0); | |
| 173 HFONT font = CreateFontIndirect(&metrics.lfMessageFont); | |
| 174 DLOG_ASSERT(font); | |
| 175 base_font_ref_ = PlatformFontWin::CreateHFontRef(font); | |
| 176 // base_font_ref_ is global, up the ref count so it's never deleted. | |
| 177 base_font_ref_->AddRef(); | |
| 178 } | |
| 179 return base_font_ref_; | |
| 180 } | |
| 181 | |
| 182 PlatformFontWin::HFontRef* PlatformFontWin::CreateHFontRef(HFONT font) { | |
| 183 TEXTMETRIC font_metrics; | |
| 184 HDC screen_dc = GetDC(NULL); | |
| 185 HFONT previous_font = static_cast<HFONT>(SelectObject(screen_dc, font)); | |
| 186 int last_map_mode = SetMapMode(screen_dc, MM_TEXT); | |
| 187 GetTextMetrics(screen_dc, &font_metrics); | |
| 188 // Yes, this is how Microsoft recommends calculating the dialog unit | |
| 189 // conversions. | |
| 190 SIZE ave_text_size; | |
| 191 GetTextExtentPoint32(screen_dc, | |
| 192 L"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", | |
| 193 52, &ave_text_size); | |
| 194 const int dlu_base_x = (ave_text_size.cx / 26 + 1) / 2; | |
| 195 // To avoid the DC referencing font_handle_, select the previous font. | |
| 196 SelectObject(screen_dc, previous_font); | |
| 197 SetMapMode(screen_dc, last_map_mode); | |
| 198 ReleaseDC(NULL, screen_dc); | |
| 199 | |
| 200 const int height = std::max(1, static_cast<int>(font_metrics.tmHeight)); | |
| 201 const int baseline = std::max(1, static_cast<int>(font_metrics.tmAscent)); | |
| 202 const int ave_char_width = | |
| 203 std::max(1, static_cast<int>(font_metrics.tmAveCharWidth)); | |
| 204 int style = 0; | |
| 205 if (font_metrics.tmItalic) | |
| 206 style |= Font::ITALIC; | |
| 207 if (font_metrics.tmUnderlined) | |
| 208 style |= Font::UNDERLINED; | |
| 209 if (font_metrics.tmWeight >= kTextMetricWeightBold) | |
| 210 style |= Font::BOLD; | |
| 211 | |
| 212 return new HFontRef(font, height, baseline, ave_char_width, style, | |
| 213 dlu_base_x); | |
| 214 } | |
| 215 | |
| 216 PlatformFontWin::PlatformFontWin(HFontRef* hfont_ref) : font_ref_(hfont_ref) { | |
| 217 } | |
| 218 | |
| 219 //////////////////////////////////////////////////////////////////////////////// | |
| 220 // PlatformFontWin::HFontRef: | |
| 221 | |
| 222 PlatformFontWin::HFontRef::HFontRef(HFONT hfont, | |
| 223 int height, | |
| 224 int baseline, | |
| 225 int ave_char_width, | |
| 226 int style, | |
| 227 int dlu_base_x) | |
| 228 : hfont_(hfont), | |
| 229 height_(height), | |
| 230 baseline_(baseline), | |
| 231 ave_char_width_(ave_char_width), | |
| 232 style_(style), | |
| 233 dlu_base_x_(dlu_base_x) { | |
| 234 DLOG_ASSERT(hfont); | |
| 235 | |
| 236 LOGFONT font_info; | |
| 237 GetObject(hfont_, sizeof(LOGFONT), &font_info); | |
| 238 font_name_ = string16(font_info.lfFaceName); | |
| 239 } | |
| 240 | |
| 241 PlatformFontWin::HFontRef::~HFontRef() { | |
| 242 DeleteObject(hfont_); | |
| 243 } | |
| 244 | |
| 245 //////////////////////////////////////////////////////////////////////////////// | |
| 246 // PlatformFont, public: | |
| 247 | |
| 248 // static | |
| 249 PlatformFont* PlatformFont::CreateDefault() { | |
| 250 return new PlatformFontWin; | |
| 251 } | |
| 252 | |
| 253 // static | |
| 254 PlatformFont* PlatformFont::CreateFromFont(const Font& other) { | |
| 255 return new PlatformFontWin(other); | |
| 256 } | |
| 257 | |
| 258 // static | |
| 259 PlatformFont* PlatformFont::CreateFromNativeFont(NativeFont native_font) { | |
| 260 return new PlatformFontWin(native_font); | |
| 261 } | |
| 262 | |
| 263 // static | |
| 264 PlatformFont* PlatformFont::CreateFromNameAndSize(const string16& font_name, | |
| 265 int font_size) { | |
| 266 return new PlatformFontWin(font_name, font_size); | |
| 267 } | |
| 268 | |
| 269 } // namespace gfx | |
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Chromium Code Reviews
Issue 6246027:
Move src/gfx/ to src/ui/gfx... (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src/