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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/font.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/win_util.h" | |
| 15 #include "gfx/canvas_skia.h" | |
| 16 | |
| 17 namespace gfx { | |
| 18 | |
| 19 // static | |
| 20 Font::HFontRef* Font::base_font_ref_; | |
| 21 | |
| 22 // static | |
| 23 Font::AdjustFontCallback Font::adjust_font_callback = NULL; | |
| 24 Font::GetMinimumFontSizeCallback Font::get_minimum_font_size_callback = NULL; | |
| 25 | |
| 26 // If the tmWeight field of a TEXTMETRIC structure has a value >= this, the | |
| 27 // font is bold. | |
| 28 static const int kTextMetricWeightBold = 700; | |
| 29 | |
| 30 // Returns either minimum font allowed for a current locale or | |
| 31 // lf_height + size_delta value. | |
| 32 static int AdjustFontSize(int lf_height, int size_delta) { | |
| 33 if (lf_height < 0) { | |
| 34 lf_height -= size_delta; | |
| 35 } else { | |
| 36 lf_height += size_delta; | |
| 37 } | |
| 38 int min_font_size = 0; | |
| 39 if (Font::get_minimum_font_size_callback) | |
| 40 min_font_size = Font::get_minimum_font_size_callback(); | |
| 41 // Make sure lf_height is not smaller than allowed min font size for current | |
| 42 // locale. | |
| 43 if (abs(lf_height) < min_font_size) { | |
| 44 return lf_height < 0 ? -min_font_size : min_font_size; | |
| 45 } else { | |
| 46 return lf_height; | |
| 47 } | |
| 48 } | |
| 49 | |
| 50 // | |
| 51 // Font | |
| 52 // | |
| 53 | |
| 54 Font::Font() | |
| 55 : font_ref_(GetBaseFontRef()) { | |
| 56 } | |
| 57 | |
| 58 int Font::height() const { | |
| 59 return font_ref_->height(); | |
| 60 } | |
| 61 | |
| 62 int Font::baseline() const { | |
| 63 return font_ref_->baseline(); | |
| 64 } | |
| 65 | |
| 66 int Font::ave_char_width() const { | |
| 67 return font_ref_->ave_char_width(); | |
| 68 } | |
| 69 | |
| 70 int Font::GetExpectedTextWidth(int length) const { | |
| 71 return length * std::min(font_ref_->dlu_base_x(), ave_char_width()); | |
| 72 } | |
| 73 | |
| 74 int Font::style() const { | |
| 75 return font_ref_->style(); | |
| 76 } | |
| 77 | |
| 78 NativeFont Font::nativeFont() const { | |
| 79 return hfont(); | |
| 80 } | |
| 81 | |
| 82 // static | |
| 83 Font Font::CreateFont(HFONT font) { | |
| 84 DCHECK(font); | |
| 85 LOGFONT font_info; | |
| 86 GetObject(font, sizeof(LOGFONT), &font_info); | |
| 87 return Font(CreateHFontRef(CreateFontIndirect(&font_info))); | |
| 88 } | |
| 89 | |
| 90 Font Font::CreateFont(const std::wstring& font_name, int font_size) { | |
| 91 HDC hdc = GetDC(NULL); | |
| 92 long lf_height = -MulDiv(font_size, GetDeviceCaps(hdc, LOGPIXELSY), 72); | |
| 93 ReleaseDC(NULL, hdc); | |
| 94 HFONT hf = ::CreateFont(lf_height, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
| 95 font_name.c_str()); | |
| 96 return Font::CreateFont(hf); | |
| 97 } | |
| 98 | |
| 99 // static | |
| 100 Font::HFontRef* Font::GetBaseFontRef() { | |
| 101 if (base_font_ref_ == NULL) { | |
| 102 NONCLIENTMETRICS metrics; | |
| 103 win_util::GetNonClientMetrics(&metrics); | |
| 104 | |
| 105 if (adjust_font_callback) | |
| 106 adjust_font_callback(&metrics.lfMessageFont); | |
| 107 metrics.lfMessageFont.lfHeight = | |
| 108 AdjustFontSize(metrics.lfMessageFont.lfHeight, 0); | |
| 109 HFONT font = CreateFontIndirect(&metrics.lfMessageFont); | |
| 110 DLOG_ASSERT(font); | |
| 111 base_font_ref_ = Font::CreateHFontRef(font); | |
| 112 // base_font_ref_ is global, up the ref count so it's never deleted. | |
| 113 base_font_ref_->AddRef(); | |
| 114 } | |
| 115 return base_font_ref_; | |
| 116 } | |
| 117 | |
| 118 const std::wstring& Font::FontName() const { | |
| 119 return font_ref_->font_name(); | |
| 120 } | |
| 121 | |
| 122 int Font::FontSize() { | |
| 123 LOGFONT font_info; | |
| 124 GetObject(hfont(), sizeof(LOGFONT), &font_info); | |
| 125 long lf_height = font_info.lfHeight; | |
| 126 HDC hdc = GetDC(NULL); | |
| 127 int device_caps = GetDeviceCaps(hdc, LOGPIXELSY); | |
| 128 int font_size = 0; | |
| 129 if (device_caps != 0) { | |
| 130 float font_size_float = -static_cast<float>(lf_height)*72/device_caps; | |
| 131 font_size = static_cast<int>(::ceil(font_size_float - 0.5)); | |
| 132 } | |
| 133 ReleaseDC(NULL, hdc); | |
| 134 return font_size; | |
| 135 } | |
| 136 | |
| 137 Font::HFontRef::HFontRef(HFONT hfont, | |
| 138 int height, | |
| 139 int baseline, | |
| 140 int ave_char_width, | |
| 141 int style, | |
| 142 int dlu_base_x) | |
| 143 : hfont_(hfont), | |
| 144 height_(height), | |
| 145 baseline_(baseline), | |
| 146 ave_char_width_(ave_char_width), | |
| 147 style_(style), | |
| 148 dlu_base_x_(dlu_base_x) { | |
| 149 DLOG_ASSERT(hfont); | |
| 150 | |
| 151 LOGFONT font_info; | |
| 152 GetObject(hfont_, sizeof(LOGFONT), &font_info); | |
| 153 font_name_ = std::wstring(font_info.lfFaceName); | |
| 154 } | |
| 155 | |
| 156 Font::HFontRef::~HFontRef() { | |
| 157 DeleteObject(hfont_); | |
| 158 } | |
| 159 | |
| 160 Font Font::DeriveFont(int size_delta, int style) const { | |
| 161 LOGFONT font_info; | |
| 162 GetObject(hfont(), sizeof(LOGFONT), &font_info); | |
| 163 font_info.lfHeight = AdjustFontSize(font_info.lfHeight, size_delta); | |
| 164 font_info.lfUnderline = ((style & UNDERLINED) == UNDERLINED); | |
| 165 font_info.lfItalic = ((style & ITALIC) == ITALIC); | |
| 166 font_info.lfWeight = (style & BOLD) ? FW_BOLD : FW_NORMAL; | |
| 167 | |
| 168 HFONT hfont = CreateFontIndirect(&font_info); | |
| 169 return Font(CreateHFontRef(hfont)); | |
| 170 } | |
| 171 | |
| 172 int Font::GetStringWidth(const std::wstring& text) const { | |
| 173 int width = 0, height = 0; | |
| 174 CanvasSkia::SizeStringInt(text, *this, &width, &height, | |
| 175 gfx::Canvas::NO_ELLIPSIS); | |
| 176 return width; | |
| 177 } | |
| 178 | |
| 179 Font::HFontRef* Font::CreateHFontRef(HFONT font) { | |
| 180 TEXTMETRIC font_metrics; | |
| 181 HDC screen_dc = GetDC(NULL); | |
| 182 HFONT previous_font = static_cast<HFONT>(SelectObject(screen_dc, font)); | |
| 183 int last_map_mode = SetMapMode(screen_dc, MM_TEXT); | |
| 184 GetTextMetrics(screen_dc, &font_metrics); | |
| 185 // Yes, this is how Microsoft recommends calculating the dialog unit | |
| 186 // conversions. | |
| 187 SIZE ave_text_size; | |
| 188 GetTextExtentPoint32(screen_dc, | |
| 189 L"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", | |
| 190 52, &ave_text_size); | |
| 191 const int dlu_base_x = (ave_text_size.cx / 26 + 1) / 2; | |
| 192 // To avoid the DC referencing font_handle_, select the previous font. | |
| 193 SelectObject(screen_dc, previous_font); | |
| 194 SetMapMode(screen_dc, last_map_mode); | |
| 195 ReleaseDC(NULL, screen_dc); | |
| 196 | |
| 197 const int height = std::max(1, static_cast<int>(font_metrics.tmHeight)); | |
| 198 const int baseline = std::max(1, static_cast<int>(font_metrics.tmAscent)); | |
| 199 const int ave_char_width = | |
| 200 std::max(1, static_cast<int>(font_metrics.tmAveCharWidth)); | |
| 201 int style = 0; | |
| 202 if (font_metrics.tmItalic) { | |
| 203 style |= Font::ITALIC; | |
| 204 } | |
| 205 if (font_metrics.tmUnderlined) { | |
| 206 style |= Font::UNDERLINED; | |
| 207 } | |
| 208 if (font_metrics.tmWeight >= kTextMetricWeightBold) { | |
| 209 style |= Font::BOLD; | |
| 210 } | |
| 211 | |
| 212 return new HFontRef(font, height, baseline, ave_char_width, style, | |
| 213 dlu_base_x); | |
| 214 } | |
| 215 | |
| 216 } // namespace gfx | |
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Chromium Code Reviews
Issue 3083022:
Rework gfx::Font by moving platform-specific code into inner classes.... (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src/