/* * 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 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 <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; } static void showGlyphsWithAdvances(const FontPlatformData& font, CGContextRef context, const CGGlyph* glyphs, const CGSize* advances, size_t count) { if (!font.isColorBitmapFont()) 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(font.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 newShouldUseFontSmoothing = shouldUseSmoothing(); switch(fontDescription().fontSmoothing()) { case Antialiased: { context->setShouldAntialias(true); newShouldUseFontSmoothing = false; break; } case SubpixelAntialiased: { context->setShouldAntialias(true); newShouldUseFontSmoothing = true; break; } case NoSmoothing: { context->setShouldAntialias(false); newShouldUseFontSmoothing = false; break; } case AutoSmoothing: { // For the AutoSmooth case, don't do anything! Keep the default settings. break; } default: ASSERT_NOT_REACHED(); } 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 vertically based on font size. float y = point.y(); if (fontSize >= 16) { if (fontSize < 26) y -= .35f * fontSize - 10; // Undo Core Text's y adjustment. point.setY(floorf(y) + .35f * min<float>(fontSize, 20) - 10); } } 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); IntSize shadowSize; int shadowBlur; Color shadowColor; ColorSpace fillColorSpace = context->fillColorSpace(); context->getShadow(shadowSize, shadowBlur, shadowColor); bool hasSimpleShadow = context->textDrawingMode() == cTextFill && shadowColor.isValid() && !shadowBlur && !platformData.isColorBitmapFont(); 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, fillColorSpace); CGContextSetTextPosition(cgContext, point.x() + shadowSize.width(), point.y() + shadowSize.height()); showGlyphsWithAdvances(platformData, cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); if (font->syntheticBoldOffset() && !platformData.m_isEmoji) { CGContextSetTextPosition(cgContext, point.x() + shadowSize.width() + font->syntheticBoldOffset(), point.y() + shadowSize.height()); showGlyphsWithAdvances(platformData, cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); } context->setFillColor(fillColor, fillColorSpace); } CGContextSetTextPosition(cgContext, point.x(), point.y()); showGlyphsWithAdvances(platformData, cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); if (font->syntheticBoldOffset() && !platformData.m_isEmoji) { CGContextSetTextPosition(cgContext, point.x() + font->syntheticBoldOffset(), point.y()); showGlyphsWithAdvances(platformData, cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs); } if (hasSimpleShadow) context->setShadow(shadowSize, shadowBlur, shadowColor, fillColorSpace); } }