GraphicsContextMac.mm   [plain text]

/*
 * Copyright (C) 2003, 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#import "config.h"
#import "GraphicsContext.h"

#import "WKGraphics.h"

#import "WebCoreSystemInterface.h"

// FIXME: More of this should use CoreGraphics instead of AppKit.
// FIXME: More of this should move into GraphicsContextCG.cpp.

namespace WebCore {

// NSColor, NSBezierPath, and NSGraphicsContext
// calls in this file are all exception-safe, so we don't block
// exceptions for those.

class GraphicsContextPlatformPrivate {
public:
    GraphicsContextPlatformPrivate(CGContextRef);
    ~GraphicsContextPlatformPrivate();

    CGContextRef m_cgContext;
    IntRect m_focusRingClip; // Work around CG bug in focus ring clipping.
};

GraphicsContextPlatformPrivate::GraphicsContextPlatformPrivate(CGContextRef cgContext)
{
    m_cgContext = cgContext;
    CGContextRetain(m_cgContext);
}

GraphicsContextPlatformPrivate::~GraphicsContextPlatformPrivate()
{
    CGContextRelease(m_cgContext);
}

GraphicsContext::GraphicsContext(CGContextRef cgContext)
    : m_common(createGraphicsContextPrivate())
    , m_data(new GraphicsContextPlatformPrivate(cgContext))
{
    setPaintingDisabled(!cgContext);

    CGContextSetShouldAntialias(m_data->m_cgContext, true);
    
    CGContextSetShouldAntialiasFonts(m_data->m_cgContext, true);
}

GraphicsContext::~GraphicsContext()
{
    destroyGraphicsContextPrivate(m_common);
    delete m_data;
}

void GraphicsContext::setFocusRingClip(const IntRect& r)
{
    // This method only exists to work around bugs in Mac focus ring clipping.
    m_data->m_focusRingClip = r;
}

void GraphicsContext::clearFocusRingClip()
{
    // This method only exists to work around bugs in Mac focus ring clipping.
    m_data->m_focusRingClip = IntRect();
}

void GraphicsContext::drawFocusRing(const Color& color)
{
}

CGContextRef GraphicsContext::platformContext() const
{
    ASSERT(!paintingDisabled());
    ASSERT(m_data->m_cgContext);
    return m_data->m_cgContext;
}

void GraphicsContext::setCompositeOperation(CompositeOperator op)
{
}

void GraphicsContext::drawLineForMisspelling(const IntPoint& point, int width)
{
    if (paintingDisabled())
        return;
        
    // Constants for pattern color
    static CGPatternRef spellingPattern = NULL;
    static bool usingDot = false;
    int patternHeight = cMisspellingLineThickness;
    int patternWidth = cMisspellingLinePatternWidth;
 
    if (!spellingPattern) {
        CGImageRef image = WKGraphicsCreateImageFromBundleWithName("SpellingDot");
        assert(image); // if image is not available, we want to know
        spellingPattern = WKCreatePatternFromCGImage(image);
        CGImageRelease(image);
        usingDot = true;
    }

    // Make sure to draw only complete dots.
    // NOTE: Code here used to shift the underline to the left and increase the width
    // to make sure everything gets underlined, but that results in drawing out of
    // bounds (e.g. when at the edge of a view) and could make it appear that the
    // space between adjacent misspelled words was underlined.
    if (usingDot) {
        // allow slightly more considering that the pattern ends with a transparent pixel
        int widthMod = width % patternWidth;
        if (patternWidth - widthMod > cMisspellingLinePatternGapWidth)
            width -= widthMod;
    }

    // Draw underline
    CGContextRef context = WKGetCurrentGraphicsContext();
    CGContextSaveGState(context);

    WKSetPattern(context, spellingPattern, YES, YES);

    wkSetPatternPhaseInUserSpace(context, point);

    WKRectFillUsingOperation(context, CGRectMake(point.x(), point.y(), width, patternHeight), kCGCompositeDover);

    CGContextRestoreGState(context);
}

    void GraphicsContext::setPenFromCGColor (CGColorRef color) {
        float r, g, b, a;
        GSColorGetRGBAComponents(color, &r, &g, &b, &a);
        setPen(makeRGBA((int)(r * 255), (int)(g * 255), (int)(b * 255), (int)(a * 255)));
    }

}