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 <tchar.h> 41 #include <wtf/MathExtras.h> 42 43 namespace WebCore { 44 45 void SimpleFontData::platformInit() 46 { 47 m_scriptCache = 0; 48 m_scriptFontProperties = 0; 49 m_isSystemFont = false; 50 51 m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f; 52 53 if (m_platformData.useGDI()) 54 return initGDIFont(); 55 56 HDC hdc = GetDC(0); 57 SaveDC(hdc); 58 59 cairo_scaled_font_t* scaledFont = m_platformData.scaledFont(); 60 const double metricsMultiplier = cairo_win32_scaled_font_get_metrics_factor(scaledFont) * m_platformData.size(); 61 62 cairo_win32_scaled_font_select_font(scaledFont, hdc); 63 64 TEXTMETRIC textMetrics; 65 GetTextMetrics(hdc, &textMetrics); 66 m_ascent = lroundf(textMetrics.tmAscent * metricsMultiplier); 67 m_descent = lroundf(textMetrics.tmDescent * metricsMultiplier); 68 m_xHeight = m_ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts. 69 m_lineGap = lroundf(textMetrics.tmExternalLeading * metricsMultiplier); 70 m_lineSpacing = m_ascent + m_descent + m_lineGap; 71 m_avgCharWidth = lroundf(textMetrics.tmAveCharWidth * metricsMultiplier); 72 m_maxCharWidth = lroundf(textMetrics.tmMaxCharWidth * metricsMultiplier); 73 74 OUTLINETEXTMETRIC metrics; 75 if (GetOutlineTextMetrics(hdc, sizeof(metrics), &metrics) > 0) { 76 // This is a TrueType font. We might be able to get an accurate xHeight 77 GLYPHMETRICS gm; 78 MAT2 mat = { 1, 0, 0, 1 }; 79 DWORD len = GetGlyphOutline(hdc, 'x', GGO_METRICS, &gm, 0, 0, &mat); 80 if (len != GDI_ERROR && gm.gmptGlyphOrigin.y > 0) 81 m_xHeight = gm.gmptGlyphOrigin.y * metricsMultiplier; 82 } 83 84 cairo_win32_scaled_font_done_font(scaledFont); 85 86 m_isSystemFont = false; 87 m_scriptCache = 0; 88 m_scriptFontProperties = 0; 89 90 RestoreDC(hdc, -1); 91 ReleaseDC(0, hdc); 92 } 93 94 void SimpleFontData::platformCharWidthInit() 95 { 96 // charwidths are set in platformInit. 97 } 98 99 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const 100 { 101 if (m_platformData.useGDI()) 102 return widthForGDIGlyph(glyph); 103 104 HDC hdc = GetDC(0); 105 SaveDC(hdc); 106 107 cairo_scaled_font_t* scaledFont = m_platformData.scaledFont(); 108 cairo_win32_scaled_font_select_font(scaledFont, hdc); 109 110 int width; 111 GetCharWidthI(hdc, glyph, 1, 0, &width); 112 113 cairo_win32_scaled_font_done_font(scaledFont); 114 115 RestoreDC(hdc, -1); 116 ReleaseDC(0, hdc); 117 118 const double metricsMultiplier = cairo_win32_scaled_font_get_metrics_factor(scaledFont) * m_platformData.size(); 119 return width * metricsMultiplier; 120 } 121 122 } 123
