/* * Copyright (C) 1999 Lars Knoll (knoll@kde.org) * (C) 1999 Antti Koivisto (koivisto@kde.org) * (C) 2000 Dirk Mueller (mueller@kde.org) * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public License * along with this library; see the file COPYING.LIB. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA 02110-1301, USA. */ #import "config.h" #import "Font.h" #import "GlyphBuffer.h" #import "GraphicsContext.h" #import "Logging.h" #import "SimpleFontData.h" #import "WebCoreSystemInterface.h" #import "BitmapImage.h" #import "SharedBuffer.h" #import "WAKView.h" #import "WKGraphics.h" #import <CoreFoundation/CFPriv.h> #import <CoreText/CoreText.h> #import <GraphicsServices/GraphicsServices.h> #import <wtf/StdLibExtras.h> #import <wtf/Threading.h> #define SYNTHETIC_OBLIQUE_ANGLE 14 #ifdef __LP64__ #define URefCon void* #else #define URefCon UInt32 #endif using namespace std; namespace WebCore { bool Font::canReturnFallbackFontsForComplexText() { return true; } bool Font::canExpandAroundIdeographsInComplexText() { return true; } // CTFontGetVerticalTranslationsForGlyphs is different on Snow Leopard. It returns values for a font-size of 1 // without unitsPerEm applied. We have to apply a transform that scales up to the point size and that also // divides by unitsPerEm. static bool hasBrokenCTFontGetVerticalTranslationsForGlyphs() { // Chromium runs the same binary on both Leopard and Snow Leopard, so the check has to happen at runtime. return false; } static void showGlyphsWithAdvances(const FloatPoint& point, const SimpleFontData* font, CGContextRef context, const CGGlyph* glyphs, const CGSize* advances, size_t count) { CGContextSetTextPosition(context, point.x(), point.y()); const FontPlatformData& platformData = font->platformData(); if (!platformData.isColorBitmapFont()) { CGAffineTransform savedMatrix; bool isVertical = font->platformData().orientation() == Vertical; if (isVertical) { CGAffineTransform rotateLeftTransform = CGAffineTransformMake(0, -1, 1, 0, 0, 0); savedMatrix = CGContextGetTextMatrix(context); CGAffineTransform runMatrix = CGAffineTransformConcat(savedMatrix, rotateLeftTransform); CGContextSetTextMatrix(context, runMatrix); CGAffineTransform translationsTransform; if (hasBrokenCTFontGetVerticalTranslationsForGlyphs()) { translationsTransform = CGAffineTransformMake(platformData.m_size, 0, 0, platformData.m_size, 0, 0); translationsTransform = CGAffineTransformConcat(translationsTransform, rotateLeftTransform); CGFloat unitsPerEm = CGFontGetUnitsPerEm(platformData.cgFont()); translationsTransform = CGAffineTransformConcat(translationsTransform, CGAffineTransformMakeScale(1 / unitsPerEm, 1 / unitsPerEm)); } else { translationsTransform = rotateLeftTransform; } Vector<CGSize, 256> translations(count); CTFontGetVerticalTranslationsForGlyphs(platformData.ctFont(), glyphs, translations.data(), count); CGAffineTransform transform = CGAffineTransformInvert(CGContextGetTextMatrix(context)); CGPoint position = FloatPoint(point.x(), point.y() + font->fontMetrics().floatAscent(IdeographicBaseline) - font->fontMetrics().floatAscent()); Vector<CGPoint, 256> positions(count); for (size_t i = 0; i < count; ++i) { CGSize translation = CGSizeApplyAffineTransform(translations[i], translationsTransform); positions[i] = CGPointApplyAffineTransform(CGPointMake(position.x - translation.width, position.y + translation.height), transform); position.x += advances[i].width; position.y += advances[i].height; } CGContextShowGlyphsAtPositions(context, glyphs, positions.data(), count); CGContextSetTextMatrix(context, savedMatrix); } else CGContextShowGlyphsWithAdvances(context, glyphs, advances, count); } else { if (!count) return; Vector<CGPoint, 256> positions(count); CGAffineTransform matrix = CGAffineTransformInvert(CGContextGetTextMatrix(context)); positions[0] = CGPointZero; for (size_t i = 1; i < count; ++i) { CGSize advance = CGSizeApplyAffineTransform(advances[i - 1], matrix); positions[i].x = positions[i - 1].x + advance.width; positions[i].y = positions[i - 1].y + advance.height; } CTFontDrawGlyphs(platformData.ctFont(), glyphs, positions.data(), count, context); } } void Font::drawGlyphs(GraphicsContext* context, const SimpleFontData* font, const GlyphBuffer& glyphBuffer, int from, int numGlyphs, const FloatPoint& anchorPoint, bool /*setColor*/) const { CGContextRef cgContext = context->platformContext(); bool shouldSmoothFonts = true; bool changeFontSmoothing = false; switch(fontDescription().fontSmoothing()) { case Antialiased: { context->setShouldAntialias(true); shouldSmoothFonts = false; changeFontSmoothing = true; break; } case SubpixelAntialiased: { context->setShouldAntialias(true); shouldSmoothFonts = true; changeFontSmoothing = true; break; } case NoSmoothing: { context->setShouldAntialias(false); shouldSmoothFonts = false; changeFontSmoothing = true; break; } case AutoSmoothing: { // For the AutoSmooth case, don't do anything! Keep the default settings. break; } default: ASSERT_NOT_REACHED(); } if (!shouldUseSmoothing()) { shouldSmoothFonts = false; changeFontSmoothing = true; } const FontPlatformData& platformData = font->platformData(); CGContextSetFont(cgContext, platformData.cgFont()); FloatPoint point = anchorPoint; float fontSize = platformData.size(); if (platformData.m_isEmoji) { if (!context->emojiDrawingEnabled()) return; // Mimic the positioining of non-bitmap glyphs, which are not subpixel-positioned. point.setY(ceilf(point.y())); // Emoji glyphs snap to the CSS pixel grid. point.setX(floorf(point.x())); // Emoji glyphs are offset one CSS pixel to the right. point.move(1, 0); // Emoji glyphs are offset vertically based on font size. float y = point.y(); if (fontSize <= 15) { // Undo Core Text's y adjustment. static float yAdjustmentFactor = iosExecutableWasLinkedOnOrAfterVersion(wkIOSSystemVersion_6_0) ? .19 : .1; point.setY(floorf(y) - yAdjustmentFactor * (fontSize + 2) + 2); } else { if (fontSize < 26) y -= .35f * fontSize - 10; // Undo Core Text's y adjustment. static float yAdjustment = iosExecutableWasLinkedOnOrAfterVersion(wkIOSSystemVersion_6_0) ? 3.8 : 2; point.setY(floorf(y) - yAdjustment); } } CGAffineTransform matrix = platformData.isColorBitmapFont() ? CGAffineTransformIdentity : CGAffineTransformMakeScale(fontSize, fontSize); matrix.b = -matrix.b; matrix.d = -matrix.d; if (platformData.m_syntheticOblique) matrix = CGAffineTransformConcat(matrix, CGAffineTransformMake(1, 0, -tanf(SYNTHETIC_OBLIQUE_ANGLE * acosf(0) / 90), 1, 0, 0)); CGContextSetTextMatrix(cgContext, matrix); CGContextSetFontSize(cgContext, 1.0f); FloatSize shadowOffset; float shadowBlur; Color shadowColor; ColorSpace shadowColorSpace; ColorSpace fillColorSpace = context->fillColorSpace(); context->getShadow(shadowOffset, shadowBlur, shadowColor, shadowColorSpace); AffineTransform contextCTM = context->getCTM(); float syntheticBoldOffset = font->syntheticBoldOffset(); if (syntheticBoldOffset && !contextCTM.isIdentityOrTranslationOrFlipped()) { FloatSize horizontalUnitSizeInDevicePixels = contextCTM.mapSize(FloatSize(1, 0)); float horizontalUnitLengthInDevicePixels = sqrtf(horizontalUnitSizeInDevicePixels.width() * horizontalUnitSizeInDevicePixels.width() + horizontalUnitSizeInDevicePixels.height() * horizontalUnitSizeInDevicePixels.height()); if (horizontalUnitLengthInDevicePixels) syntheticBoldOffset /= horizontalUnitLengthInDevicePixels; }; bool hasSimpleShadow = context->textDrawingMode() == TextModeFill && shadowColor.isValid() && !shadowBlur && !platformData.isColorBitmapFont() && (!context->shadowsIgnoreTransforms() || contextCTM.isIdentityOrTranslationOrFlipped()) && !context->isInTransparencyLayer(); if (hasSimpleShadow) { // Paint simple shadows ourselves instead of relying on CG shadows, to avoid losing subpixel antialiasing. context->clearShadow(); Color fillColor = context->fillColor(); Color shadowFillColor(shadowColor.red(), shadowColor.green(), shadowColor.blue(), shadowColor.alpha() * fillColor.alpha() / 255); context->setFillColor(shadowFillColor, shadowColorSpace); float shadowTextX = point.x() + shadowOffset.width(); // If shadows are ignoring transforms, then we haven't applied the Y coordinate flip yet, so down is negative. float shadowTextY = point.y() + shadowOffset.height() * (context->shadowsIgnoreTransforms() ? -1 : 1); showGlyphsWithAdvances(FloatPoint(shadowTextX, shadowTextY), font, cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); if (syntheticBoldOffset && !platformData.m_isEmoji) showGlyphsWithAdvances(FloatPoint(shadowTextX + syntheticBoldOffset, shadowTextY), font, cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); context->setFillColor(fillColor, fillColorSpace); } showGlyphsWithAdvances(point, font, cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); if (syntheticBoldOffset && !platformData.m_isEmoji) showGlyphsWithAdvances(FloatPoint(point.x() + syntheticBoldOffset, point.y()), font, cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); if (hasSimpleShadow) context->setShadow(shadowOffset, shadowBlur, shadowColor, shadowColorSpace); } }