1/* 2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org) 3 * (C) 1999 Antti Koivisto (koivisto@kde.org) 4 * (C) 2000 Dirk Mueller (mueller@kde.org) 5 * Copyright (C) 2003, 2006 Apple Computer, Inc. 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Library General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Library General Public License for more details. 16 * 17 * You should have received a copy of the GNU Library General Public License 18 * along with this library; see the file COPYING.LIB. If not, write to 19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 20 * Boston, MA 02110-1301, USA. 21 */ 22 23#import "config.h" 24#import "Font.h" 25 26#import "GlyphBuffer.h" 27#import "GraphicsContext.h" 28#import "Logging.h" 29#import "SimpleFontData.h" 30#import "WebCoreSystemInterface.h" 31#import <AppKit/AppKit.h> 32 33#define SYNTHETIC_OBLIQUE_ANGLE 14 34 35#ifdef __LP64__ 36#define URefCon void* 37#else 38#define URefCon UInt32 39#endif 40 41using namespace std; 42 43namespace WebCore { 44 45bool Font::canReturnFallbackFontsForComplexText() 46{ 47 return true; 48} 49 50void Font::drawGlyphs(GraphicsContext* context, const SimpleFontData* font, const GlyphBuffer& glyphBuffer, int from, int numGlyphs, const FloatPoint& point) const 51{ 52 CGContextRef cgContext = context->platformContext(); 53 bool newShouldUseFontSmoothing = shouldUseSmoothing(); 54 55 switch(fontDescription().fontSmoothing()) { 56 case Antialiased: { 57 context->setShouldAntialias(true); 58 newShouldUseFontSmoothing = false; 59 break; 60 } 61 case SubpixelAntialiased: { 62 context->setShouldAntialias(true); 63 newShouldUseFontSmoothing = true; 64 break; 65 } 66 case NoSmoothing: { 67 context->setShouldAntialias(false); 68 newShouldUseFontSmoothing = false; 69 break; 70 } 71 case AutoSmoothing: { 72 // For the AutoSmooth case, don't do anything! Keep the default settings. 73 break; 74 } 75 default: 76 ASSERT_NOT_REACHED(); 77 } 78 79 bool originalShouldUseFontSmoothing = wkCGContextGetShouldSmoothFonts(cgContext); 80 if (originalShouldUseFontSmoothing != newShouldUseFontSmoothing) 81 CGContextSetShouldSmoothFonts(cgContext, newShouldUseFontSmoothing); 82 83 const FontPlatformData& platformData = font->platformData(); 84 NSFont* drawFont; 85 if (!isPrinterFont()) { 86 drawFont = [platformData.font() screenFont]; 87 if (drawFont != platformData.font()) 88 // We are getting this in too many places (3406411); use ERROR so it only prints on debug versions for now. (We should debug this also, eventually). 89 LOG_ERROR("Attempting to set non-screen font (%@) when drawing to screen. Using screen font anyway, may result in incorrect metrics.", 90 [[[platformData.font() fontDescriptor] fontAttributes] objectForKey:NSFontNameAttribute]); 91 } else { 92 drawFont = [platformData.font() printerFont]; 93 if (drawFont != platformData.font()) 94 NSLog(@"Attempting to set non-printer font (%@) when printing. Using printer font anyway, may result in incorrect metrics.", 95 [[[platformData.font() fontDescriptor] fontAttributes] objectForKey:NSFontNameAttribute]); 96 } 97 98 CGContextSetFont(cgContext, platformData.cgFont()); 99 100 CGAffineTransform matrix = CGAffineTransformIdentity; 101 if (drawFont) 102 memcpy(&matrix, [drawFont matrix], sizeof(matrix)); 103 matrix.b = -matrix.b; 104 matrix.d = -matrix.d; 105 if (platformData.m_syntheticOblique) 106 matrix = CGAffineTransformConcat(matrix, CGAffineTransformMake(1, 0, -tanf(SYNTHETIC_OBLIQUE_ANGLE * acosf(0) / 90), 1, 0, 0)); 107 CGContextSetTextMatrix(cgContext, matrix); 108 109 if (drawFont) { 110 wkSetCGFontRenderingMode(cgContext, drawFont); 111 CGContextSetFontSize(cgContext, 1.0f); 112 } else 113 CGContextSetFontSize(cgContext, platformData.m_size); 114 115 IntSize shadowSize; 116 int shadowBlur; 117 Color shadowColor; 118 ColorSpace fillColorSpace = context->fillColorSpace(); 119 context->getShadow(shadowSize, shadowBlur, shadowColor); 120 121 bool hasSimpleShadow = context->textDrawingMode() == cTextFill && shadowColor.isValid() && !shadowBlur; 122 if (hasSimpleShadow) { 123 // Paint simple shadows ourselves instead of relying on CG shadows, to avoid losing subpixel antialiasing. 124 context->clearShadow(); 125 Color fillColor = context->fillColor(); 126 Color shadowFillColor(shadowColor.red(), shadowColor.green(), shadowColor.blue(), shadowColor.alpha() * fillColor.alpha() / 255); 127 context->setFillColor(shadowFillColor, fillColorSpace); 128 CGContextSetTextPosition(cgContext, point.x() + shadowSize.width(), point.y() + shadowSize.height()); 129 CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); 130 if (font->syntheticBoldOffset()) { 131 CGContextSetTextPosition(cgContext, point.x() + shadowSize.width() + font->syntheticBoldOffset(), point.y() + shadowSize.height()); 132 CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); 133 } 134 context->setFillColor(fillColor, fillColorSpace); 135 } 136 137 CGContextSetTextPosition(cgContext, point.x(), point.y()); 138 CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); 139 if (font->syntheticBoldOffset()) { 140 CGContextSetTextPosition(cgContext, point.x() + font->syntheticBoldOffset(), point.y()); 141 CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); 142 } 143 144 if (hasSimpleShadow) 145 context->setShadow(shadowSize, shadowBlur, shadowColor, fillColorSpace); 146 147 if (originalShouldUseFontSmoothing != newShouldUseFontSmoothing) 148 CGContextSetShouldSmoothFonts(cgContext, originalShouldUseFontSmoothing); 149} 150 151} 152