/*
* 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 <AppKit/AppKit.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);
#if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
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(toCTFontRef(font.font()), glyphs, positions.data(), count, context);
}
#endif
}
void Font::drawGlyphs(GraphicsContext* context, const SimpleFontData* font, const GlyphBuffer& glyphBuffer, int from, int numGlyphs, const FloatPoint& point) 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();
}
bool originalShouldUseFontSmoothing = wkCGContextGetShouldSmoothFonts(cgContext);
if (originalShouldUseFontSmoothing != newShouldUseFontSmoothing)
CGContextSetShouldSmoothFonts(cgContext, newShouldUseFontSmoothing);
const FontPlatformData& platformData = font->platformData();
NSFont* drawFont;
if (!isPrinterFont()) {
drawFont = [platformData.font() screenFont];
if (drawFont != platformData.font())
// 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).
LOG_ERROR("Attempting to set non-screen font (%@) when drawing to screen. Using screen font anyway, may result in incorrect metrics.",
[[[platformData.font() fontDescriptor] fontAttributes] objectForKey:NSFontNameAttribute]);
} else {
drawFont = [platformData.font() printerFont];
if (drawFont != platformData.font())
NSLog(@"Attempting to set non-printer font (%@) when printing. Using printer font anyway, may result in incorrect metrics.",
[[[platformData.font() fontDescriptor] fontAttributes] objectForKey:NSFontNameAttribute]);
}
CGContextSetFont(cgContext, platformData.cgFont());
CGAffineTransform matrix = CGAffineTransformIdentity;
if (drawFont && !platformData.isColorBitmapFont())
memcpy(&matrix, [drawFont matrix], sizeof(matrix));
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);
if (drawFont) {
wkSetCGFontRenderingMode(cgContext, drawFont);
CGContextSetFontSize(cgContext, 1.0f);
} else
CGContextSetFontSize(cgContext, platformData.m_size);
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()) {
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()) {
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);
if (originalShouldUseFontSmoothing != newShouldUseFontSmoothing)
CGContextSetShouldSmoothFonts(cgContext, originalShouldUseFontSmoothing);
}
}