1 /* 2 * Copyright (C) 2008 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "config.h" 30 #include "SimpleFontData.h" 31 32 #include <windows.h> 33 34 #include "Font.h" 35 #include "FontCache.h" 36 #include "FontDescription.h" 37 #include <cairo.h> 38 #include <cairo-win32.h> 39 #include <mlang.h> 40 #include <wtf/MathExtras.h> 41 42 namespace WebCore { 43 44 void SimpleFontData::platformInit() 45 { 46 m_scriptCache = 0; 47 m_scriptFontProperties = 0; 48 m_isSystemFont = false; 49 50 m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f; 51 52 if (m_platformData.useGDI()) 53 return initGDIFont(); 54 55 HDC hdc = GetDC(0); 56 SaveDC(hdc); 57 58 cairo_scaled_font_t* scaledFont = m_platformData.scaledFont(); 59 const double metricsMultiplier = cairo_win32_scaled_font_get_metrics_factor(scaledFont) * m_platformData.size(); 60 61 cairo_win32_scaled_font_select_font(scaledFont, hdc); 62 63 TEXTMETRIC textMetrics; 64 GetTextMetrics(hdc, &textMetrics); 65 float ascent = textMetrics.tmAscent * metricsMultiplier; 66 float descent = textMetrics.tmDescent * metricsMultiplier; 67 float xHeight = ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts. 68 float lineGap = textMetrics.tmExternalLeading * metricsMultiplier; 69 m_fontMetrics.setAscent(ascent); 70 m_fontMetrics.setDescent(descent); 71 m_fontMetrics.setLineGap(lineGap); 72 m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(lineGap)); 73 m_avgCharWidth = textMetrics.tmAveCharWidth * metricsMultiplier; 74 m_maxCharWidth = textMetrics.tmMaxCharWidth * metricsMultiplier; 75 76 OUTLINETEXTMETRIC metrics; 77 if (GetOutlineTextMetrics(hdc, sizeof(metrics), &metrics) > 0) { 78 // This is a TrueType font. We might be able to get an accurate xHeight 79 GLYPHMETRICS gm; 80 MAT2 mat = { 1, 0, 0, 1 }; 81 DWORD len = GetGlyphOutline(hdc, 'x', GGO_METRICS, &gm, 0, 0, &mat); 82 if (len != GDI_ERROR && gm.gmptGlyphOrigin.y > 0) 83 xHeight = gm.gmptGlyphOrigin.y * metricsMultiplier; 84 } 85 86 m_fontMetrics.setXHeight(xHeight); 87 cairo_win32_scaled_font_done_font(scaledFont); 88 89 m_isSystemFont = false; 90 m_scriptCache = 0; 91 m_scriptFontProperties = 0; 92 93 RestoreDC(hdc, -1); 94 ReleaseDC(0, hdc); 95 } 96 97 void SimpleFontData::platformCharWidthInit() 98 { 99 // charwidths are set in platformInit. 100 } 101 102 FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const 103 { 104 if (m_platformData.useGDI()) 105 return boundsForGDIGlyph(glyph); 106 //FIXME: Implement this 107 return FloatRect(); 108 } 109 110 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const 111 { 112 if (m_platformData.useGDI()) 113 return widthForGDIGlyph(glyph); 114 115 HDC hdc = GetDC(0); 116 SaveDC(hdc); 117 118 cairo_scaled_font_t* scaledFont = m_platformData.scaledFont(); 119 cairo_win32_scaled_font_select_font(scaledFont, hdc); 120 121 int width; 122 GetCharWidthI(hdc, glyph, 1, 0, &width); 123 124 cairo_win32_scaled_font_done_font(scaledFont); 125 126 RestoreDC(hdc, -1); 127 ReleaseDC(0, hdc); 128 129 const double metricsMultiplier = cairo_win32_scaled_font_get_metrics_factor(scaledFont) * m_platformData.size(); 130 return width * metricsMultiplier; 131 } 132 133 } 134
