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| 1 /* | |
| 2 * Copyright (C) 2006, 2007 Apple Inc. All Rights Reserved. | |
| 3 * Copyright (c) 2008, 2009, Google Inc. All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are | |
| 7 * met: | |
| 8 * | |
| 9 * * Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * * Redistributions in binary form must reproduce the above | |
| 12 * copyright notice, this list of conditions and the following disclaimer | |
| 13 * in the documentation and/or other materials provided with the | |
| 14 * distribution. | |
| 15 * * Neither the name of Google Inc. nor the names of its | |
| 16 * contributors may be used to endorse or promote products derived from | |
| 17 * this software without specific prior written permission. | |
| 18 * | |
| 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 30 */ | |
| 31 | |
| 32 #include "config.h" | |
| 33 #include "platform/fonts/SimpleFontData.h" | |
| 34 | |
| 35 #include <mlang.h> | |
| 36 #include <objidl.h> | |
| 37 #include <unicode/uchar.h> | |
| 38 #include <unicode/unorm.h> | |
| 39 #include "platform/fonts/FontCache.h" | |
| 40 #include "platform/fonts/FontDescription.h" | |
| 41 #include "platform/fonts/win/FontPlatformDataWin.h" | |
| 42 #include "platform/geometry/FloatRect.h" | |
| 43 #include "platform/win/HWndDC.h" | |
| 44 #include "wtf/MathExtras.h" | |
| 45 | |
| 46 namespace WebCore { | |
| 47 | |
| 48 void SimpleFontData::platformInit() | |
| 49 { | |
| 50 if (!m_platformData.size()) { | |
| 51 m_fontMetrics.reset(); | |
| 52 m_avgCharWidth = 0; | |
| 53 m_maxCharWidth = 0; | |
| 54 return; | |
| 55 } | |
| 56 | |
| 57 HWndDC dc(0); | |
| 58 HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont()); | |
| 59 | |
| 60 TEXTMETRIC textMetric = {0}; | |
| 61 if (!GetTextMetrics(dc, &textMetric)) { | |
| 62 if (FontPlatformData::ensureFontLoaded(m_platformData.hfont())) { | |
| 63 // Retry GetTextMetrics. | |
| 64 // FIXME: Handle gracefully the error if this call also fails. | |
| 65 // See http://crbug.com/6401. | |
| 66 if (!GetTextMetrics(dc, &textMetric)) | |
| 67 WTF_LOG_ERROR("Unable to get the text metrics after second attem
pt"); | |
| 68 } | |
| 69 } | |
| 70 | |
| 71 m_avgCharWidth = textMetric.tmAveCharWidth; | |
| 72 m_maxCharWidth = textMetric.tmMaxCharWidth; | |
| 73 | |
| 74 // FIXME: Access ascent/descent/lineGap with floating point precision. | |
| 75 float ascent = textMetric.tmAscent; | |
| 76 float descent = textMetric.tmDescent; | |
| 77 float lineGap = textMetric.tmExternalLeading; | |
| 78 float xHeight = ascent * 0.56f; // Best guess for xHeight for non-Truetype f
onts. | |
| 79 | |
| 80 OUTLINETEXTMETRIC outlineTextMetric; | |
| 81 if (GetOutlineTextMetrics(dc, sizeof(outlineTextMetric), &outlineTextMetric)
> 0) { | |
| 82 m_fontMetrics.setUnitsPerEm(outlineTextMetric.otmEMSquare); | |
| 83 | |
| 84 // This is a TrueType font. We might be able to get an accurate xHeight
. | |
| 85 GLYPHMETRICS glyphMetrics = {0}; | |
| 86 MAT2 identityMatrix = {{0, 1}, {0, 0}, {0, 0}, {0, 1}}; | |
| 87 DWORD len = GetGlyphOutlineW(dc, 'x', GGO_METRICS, &glyphMetrics, 0, 0,
&identityMatrix); | |
| 88 if (len != GDI_ERROR && glyphMetrics.gmBlackBoxY > 0) | |
| 89 xHeight = static_cast<float>(glyphMetrics.gmBlackBoxY); | |
| 90 } | |
| 91 | |
| 92 m_fontMetrics.setAscent(ascent); | |
| 93 m_fontMetrics.setDescent(descent); | |
| 94 m_fontMetrics.setLineGap(lineGap); | |
| 95 m_fontMetrics.setXHeight(xHeight); | |
| 96 m_fontMetrics.setLineSpacing(ascent + descent + lineGap); | |
| 97 | |
| 98 SelectObject(dc, oldFont); | |
| 99 } | |
| 100 | |
| 101 void SimpleFontData::platformCharWidthInit() | |
| 102 { | |
| 103 // charwidths are set in platformInit. | |
| 104 } | |
| 105 | |
| 106 void SimpleFontData::platformDestroy() | |
| 107 { | |
| 108 } | |
| 109 | |
| 110 PassRefPtr<SimpleFontData> SimpleFontData::platformCreateScaledFontData(const Fo
ntDescription& fontDescription, float scaleFactor) const | |
| 111 { | |
| 112 LOGFONT winFont; | |
| 113 GetObject(m_platformData.hfont(), sizeof(LOGFONT), &winFont); | |
| 114 float scaledSize = scaleFactor * fontDescription.computedSize(); | |
| 115 winFont.lfHeight = -lroundf(scaledSize); | |
| 116 HFONT hfont = CreateFontIndirect(&winFont); | |
| 117 return SimpleFontData::create(FontPlatformData(hfont, scaledSize, m_platform
Data.orientation()), isCustomFont() ? CustomFontData::create(false) : 0); | |
| 118 } | |
| 119 | |
| 120 void SimpleFontData::determinePitch() | |
| 121 { | |
| 122 m_treatAsFixedPitch = platformData().isFixedPitch(); | |
| 123 } | |
| 124 | |
| 125 FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const | |
| 126 { | |
| 127 HWndDC hdc(0); | |
| 128 SetGraphicsMode(hdc, GM_ADVANCED); | |
| 129 HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont()); | |
| 130 | |
| 131 GLYPHMETRICS gdiMetrics; | |
| 132 static const MAT2 identity = { 0, 1, 0, 0, 0, 0, 0, 1 }; | |
| 133 if (GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiMetrics,
0, 0, &identity) == -1) { | |
| 134 if (FontPlatformData::ensureFontLoaded(m_platformData.hfont())) { | |
| 135 // Retry GetTextMetrics. | |
| 136 // FIXME: Handle gracefully the error if this call also fails. | |
| 137 // See http://crbug.com/6401. | |
| 138 if (GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiM
etrics, 0, 0, &identity) == -1) | |
| 139 WTF_LOG_ERROR("Unable to get the glyph metrics after second atte
mpt"); | |
| 140 } | |
| 141 } | |
| 142 | |
| 143 SelectObject(hdc, oldFont); | |
| 144 | |
| 145 return FloatRect(gdiMetrics.gmptGlyphOrigin.x, -gdiMetrics.gmptGlyphOrigin.y
, | |
| 146 gdiMetrics.gmBlackBoxX, gdiMetrics.gmBlackBoxY); | |
| 147 } | |
| 148 | |
| 149 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const | |
| 150 { | |
| 151 if (!m_platformData.size()) | |
| 152 return 0; | |
| 153 | |
| 154 HWndDC dc(0); | |
| 155 HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont()); | |
| 156 | |
| 157 int width = 0; | |
| 158 if (!GetCharWidthI(dc, glyph, 1, 0, &width)) { | |
| 159 // Ask the browser to preload the font and retry. | |
| 160 if (FontPlatformData::ensureFontLoaded(m_platformData.hfont())) { | |
| 161 // FIXME: Handle gracefully the error if this call also fails. | |
| 162 // See http://crbug.com/6401. | |
| 163 if (!GetCharWidthI(dc, glyph, 1, 0, &width)) | |
| 164 WTF_LOG_ERROR("Unable to get the char width after second attempt
"); | |
| 165 } | |
| 166 } | |
| 167 | |
| 168 SelectObject(dc, oldFont); | |
| 169 | |
| 170 return static_cast<float>(width); | |
| 171 } | |
| 172 | |
| 173 } // namespace WebCore | |
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Chromium Code Reviews
Issue 179723005:
Remove GDI font rendering code for windows (Closed)
Base URL: svn://svn.chromium.org/blink/trunk