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1/*
2 * Copyright (C) 2003, 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#import "config.h"
27#import "ColorMac.h"
28
29#import <wtf/RetainPtr.h>
30#import <wtf/StdLibExtras.h>
31
32namespace WebCore {
33
34// NSColor calls don't throw, so no need to block Cocoa exceptions in this file
35
36static bool useOldAquaFocusRingColor;
37
38RGBA32 oldAquaFocusRingColor()
39{
40    return 0xFF7DADD9;
41}
42
43void setUsesTestModeFocusRingColor(bool newValue)
44{
45    useOldAquaFocusRingColor = newValue;
46}
47
48bool usesTestModeFocusRingColor()
49{
50    return useOldAquaFocusRingColor;
51}
52
53static RGBA32 makeRGBAFromNSColor(NSColor *c)
54{
55    CGFloat redComponent;
56    CGFloat greenComponent;
57    CGFloat blueComponent;
58    CGFloat alpha;
59    [c getRed:&redComponent green:&greenComponent blue:&blueComponent alpha:&alpha];
60
61    return makeRGBA(255 * redComponent, 255 * greenComponent, 255 * blueComponent, 255 * alpha);
62}
63
64Color colorFromNSColor(NSColor *c)
65{
66    return Color(makeRGBAFromNSColor(c));
67}
68
69NSColor *nsColor(const Color& color)
70{
71    RGBA32 c = color.rgb();
72    switch (c) {
73        case 0: {
74            // Need this to avoid returning nil because cachedRGBAValues will default to 0.
75            DEFINE_STATIC_LOCAL(RetainPtr<NSColor>, clearColor, ([NSColor colorWithDeviceRed:0 green:0 blue:0 alpha:0]));
76            return clearColor.get();
77        }
78        case Color::black: {
79            DEFINE_STATIC_LOCAL(RetainPtr<NSColor>, blackColor, ([NSColor colorWithDeviceRed:0 green:0 blue:0 alpha:1]));
80            return blackColor.get();
81        }
82        case Color::white: {
83            DEFINE_STATIC_LOCAL(RetainPtr<NSColor>, whiteColor, ([NSColor colorWithDeviceRed:1 green:1 blue:1 alpha:1]));
84            return whiteColor.get();
85        }
86        default: {
87            const int cacheSize = 32;
88            static unsigned cachedRGBAValues[cacheSize];
89            static RetainPtr<NSColor>* cachedColors = new RetainPtr<NSColor>[cacheSize];
90
91            for (int i = 0; i != cacheSize; ++i)
92                if (cachedRGBAValues[i] == c)
93                    return cachedColors[i].get();
94
95            NSColor *result = [NSColor colorWithDeviceRed:static_cast<CGFloat>(color.red()) / 255
96                                                    green:static_cast<CGFloat>(color.green()) / 255
97                                                     blue:static_cast<CGFloat>(color.blue()) / 255
98                                                    alpha:static_cast<CGFloat>(color.alpha()) /255];
99
100            static int cursor;
101            cachedRGBAValues[cursor] = c;
102            cachedColors[cursor] = result;
103            if (++cursor == cacheSize)
104                cursor = 0;
105            return result;
106        }
107    }
108}
109
110static CGColorRef CGColorFromNSColor(NSColor *color)
111{
112    // This needs to always use device colorspace so it can de-calibrate the color for
113    // CGColor to possibly recalibrate it.
114    CGFloat components[4];
115    NSColor *deviceColor = [color colorUsingColorSpaceName:NSDeviceRGBColorSpace];
116    [deviceColor getRed:&components[0] green:&components[1] blue:&components[2] alpha:&components[3]];
117    static CGColorSpaceRef deviceRGBColorSpace = CGColorSpaceCreateDeviceRGB();
118    CGColorRef cgColor = CGColorCreate(deviceRGBColorSpace, components);
119    return cgColor;
120}
121
122CGColorRef createCGColor(const Color& c)
123{
124    // We could directly create a CGColor here, but that would
125    // skip any RGB caching the nsColor method does. A direct
126    // creation could be investigated for a possible performance win.
127    return CGColorFromNSColor(nsColor(c));
128}
129
130} // namespace WebCore
131