/*

 * 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 "../cg/GraphicsContextPlatformPrivate.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.

void GraphicsContext::drawFocusRing(const Color& color)

{

    if (paintingDisabled())

        return;

    int radius = (focusRingWidth() - 1) / 2;

    int offset = radius + focusRingOffset();

    CGColorRef colorRef = color.isValid() ? cgColor(color) : 0;

    CGMutablePathRef focusRingPath = CGPathCreateMutable();

    const Vector<IntRect>& rects = focusRingRects();

    unsigned rectCount = rects.size();

    for (unsigned i = 0; i < rectCount; i++)

        CGPathAddRect(focusRingPath, 0, CGRectInset(rects[i], -offset, -offset));

    CGContextRef context = platformContext();

    // FIXME: This works only inside a NSView's drawRect method. The view must be

    // focused and this context must be the current NSGraphicsContext.

    ASSERT(context == [[NSGraphicsContext currentContext] graphicsPort]);

    NSView* view = [NSView focusView];

    ASSERT(view);

    const NSRect* drawRects;

#ifdef __LP64__

    long count;

#else

    int count;

#endif

    [view getRectsBeingDrawn:&drawRects count:&count];

    // We have to pass in our own clip rectangles here because a bug in CG

    // seems to inflate the clip (thus allowing the focus ring to paint

    // slightly outside the clip).

    NSRect transformedClipRect = [view convertRect:m_data->m_focusRingClip toView:nil];

    for (int i = 0; i < count; ++i) {

        NSRect transformedRect = [view convertRect:drawRects[i] toView:nil];

        NSRect rectToUse = NSIntersectionRect(transformedRect, transformedClipRect);

        if (!NSIsEmptyRect(rectToUse)) {

            CGContextBeginPath(context);

            CGContextAddPath(context, focusRingPath);

            wkDrawFocusRing(context, *(CGRect *)&rectToUse, colorRef, radius);

        }

    }

    CGColorRelease(colorRef);

    CGPathRelease(focusRingPath);

}

void GraphicsContext::setCompositeOperation(CompositeOperator op)

{

    if (paintingDisabled())

        return;

    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

    [[NSGraphicsContext graphicsContextWithGraphicsPort:platformContext() flipped:YES]

        setCompositingOperation:(NSCompositingOperation)op];

    [pool drain];

}

void GraphicsContext::drawLineForMisspellingOrBadGrammar(const IntPoint& point, int width, bool grammar)

{

    if (paintingDisabled())

        return;

    // Constants for spelling pattern color

    static RetainPtr<NSColor> spellingPatternColor = nil;

    static bool usingDotForSpelling = false;

    // Constants for grammar pattern color

    static RetainPtr<NSColor> grammarPatternColor = nil;

    static bool usingDotForGrammar = false;

    // These are the same for misspelling or bad grammar

    int patternHeight = cMisspellingLineThickness;

    int patternWidth = cMisspellingLinePatternWidth;

    // Initialize pattern color if needed

    if (!grammar && !spellingPatternColor) {

        NSImage *image = [NSImage imageNamed:@"SpellingDot"];

        ASSERT(image); // if image is not available, we want to know

        NSColor *color = (image ? [NSColor colorWithPatternImage:image] : nil);

        if (color)

            usingDotForSpelling = true;

        else

            color = [NSColor redColor];

        spellingPatternColor = color;

    }

    if (grammar && !grammarPatternColor) {

        NSImage *image = [NSImage imageNamed:@"GrammarDot"];

        ASSERT(image); // if image is not available, we want to know

        NSColor *color = (image ? [NSColor colorWithPatternImage:image] : nil);

        if (color)

            usingDotForGrammar = true;

        else

            color = [NSColor greenColor];

        grammarPatternColor = color;

    }

    bool usingDot;

    NSColor *patternColor;

    if (grammar) {

        usingDot = usingDotForGrammar;

        patternColor = grammarPatternColor.get();

    } else {

        usingDot = usingDotForSpelling;

        patternColor = spellingPatternColor.get();

    }

    // 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;

    }

    // FIXME: This code should not use NSGraphicsContext currentContext

    // In order to remove this requirement we will need to use CGPattern instead of NSColor

    // Draw underline

    NSGraphicsContext *currentContext = [NSGraphicsContext currentContext];

    CGContextRef context = (CGContextRef)[currentContext graphicsPort];

    CGContextSaveGState(context);

    [patternColor set];

    wkSetPatternPhaseInUserSpace(context, point);

    NSRectFillUsingOperation(NSMakeRect(point.x(), point.y(), width, patternHeight), NSCompositeSourceOver);

    CGContextRestoreGState(context);

}

}