ColorChromiumMac.mm   [plain text]

/*
 * Copyright (C) 2003, 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
 * Copyright (C) 2009 Google 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "config.h"
#include "Color.h"

#import <AppKit/NSColor.h>
#import <wtf/Assertions.h>
#import <wtf/StdLibExtras.h>
#import <wtf/RetainPtr.h>

namespace WebCore {

Color focusRingColor()
{
    // To avoid the Mac Chromium build having to rebasline 500+ layout tests and
    // continue to do this w/ new tests that get landed in WebKit, we want to
    // run the layout tests w/ the same color that stock WebKit uses.
    //
    // FIXME: For now we've hard coded the color that WebKit uses for layout
    // tests.  We need to revisit this and do either of the following:
    //  A. Fully honor the color from the UI, which means collecting the color
    //     (and change notifications) in the browser process, and messaging the
    //     color to the render process.
    //  B. Adding a "layout tests" flag, to control the orage vs. blue colors
    //     depending if we're running layout tests.
    // To see the WebKit implementation of using the UI color and/or a flag for
    // layout tests see WebKit/WebCore/platform/graphics/mac/ColorMac.mm.
    // (Reality is we just need an api to override the focus color and both
    // of the above are covered for what this file needs to provide, the
    // two options would be details that happen in other places.)

    // From WebKit:
    // static RGBA32 oldAquaFocusRingColorRGBA = 0xFF7DADD9;
    static Color oldAquaFocusRingColor(0x7D, 0xAD, 0xD9, 0xFF);
    return oldAquaFocusRingColor;
}

// createCGColor() and the functions it calls are verbatum copies of
// graphics/mac/ColorMac.mm.  These are copied here so that we don't need to
// include ColorMac.mm in the Chromium build.
// FIXME: Check feasibility of using pure CG calls and unifying this copy with
// ColorMac.mm's under graphics/cg.

NSColor* nsColor(const Color& color)
{
    unsigned c = color.rgb();
    switch (c) {
        case 0: {
            // Need this to avoid returning nil because cachedRGBAValues will default to 0.
            DEFINE_STATIC_LOCAL(RetainPtr<NSColor>, clearColor, ([NSColor colorWithDeviceRed:0.0f green:0.0f blue:0.0f alpha:0.0f]));
            return clearColor.get();
        }
        case Color::black: {
            DEFINE_STATIC_LOCAL(RetainPtr<NSColor>, blackColor, ([NSColor colorWithDeviceRed:0.0f green:0.0f blue:0.0f alpha:1.0f]));
            return blackColor.get();
        }
        case Color::white: {
            DEFINE_STATIC_LOCAL(RetainPtr<NSColor>, whiteColor, ([NSColor colorWithDeviceRed:1.0f green:1.0f blue:1.0f alpha:1.0f]));
            return whiteColor.get();
        }
        default: {
            const int cacheSize = 32;
            static unsigned cachedRGBAValues[cacheSize];
            static RetainPtr<NSColor>* cachedColors = new RetainPtr<NSColor>[cacheSize];

            for (int i = 0; i != cacheSize; ++i)
                if (cachedRGBAValues[i] == c)
                    return cachedColors[i].get();

            NSColor* result = [NSColor colorWithDeviceRed:color.red() / 255.0f
                                                    green:color.green() / 255.0f
                                                     blue:color.blue() / 255.0f
                                                    alpha:color.alpha() /255.0f];

            static int cursor;
            cachedRGBAValues[cursor] = c;
            cachedColors[cursor] = result;
            if (++cursor == cacheSize)
                cursor = 0;
            return result;
        }
    }
}

static CGColorRef CGColorFromNSColor(NSColor* color)
{
    // This needs to always use device colorspace so it can de-calibrate the color for
    // CGColor to possibly recalibrate it.
    NSColor* deviceColor = [color colorUsingColorSpaceName:NSDeviceRGBColorSpace];
    CGFloat red = [deviceColor redComponent];
    CGFloat green = [deviceColor greenComponent];
    CGFloat blue = [deviceColor blueComponent];
    CGFloat alpha = [deviceColor alphaComponent];
    const CGFloat components[4] = { red, green, blue, alpha };
    static CGColorSpaceRef deviceRGBColorSpace = CGColorSpaceCreateDeviceRGB();
    CGColorRef cgColor = CGColorCreate(deviceRGBColorSpace, components);
    return cgColor;
}

CGColorRef createCGColor(const Color& c)
{
    // We could directly create a CGColor here, but that would
    // skip any RGB caching the nsColor method does. A direct
    // creation could be investigated for a possible performance win.
    return CGColorFromNSColor(nsColor(c));
}

} // namespace WebCore