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      1 /*
      2  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2010 Apple 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 #include "config.h"
     27 #include "Color.h"
     28 
     29 #if USE(CG)
     30 
     31 #include "GraphicsContextCG.h"
     32 #include <wtf/Assertions.h>
     33 #include <wtf/RetainPtr.h>
     34 #include <ApplicationServices/ApplicationServices.h>
     35 
     36 namespace WebCore {
     37 
     38 Color::Color(CGColorRef color)
     39 {
     40     if (!color) {
     41         m_color = 0;
     42         m_valid = false;
     43         return;
     44     }
     45 
     46     size_t numComponents = CGColorGetNumberOfComponents(color);
     47     const CGFloat* components = CGColorGetComponents(color);
     48 
     49     float r = 0;
     50     float g = 0;
     51     float b = 0;
     52     float a = 0;
     53 
     54     switch (numComponents) {
     55     case 2:
     56         r = g = b = components[0];
     57         a = components[1];
     58         break;
     59     case 4:
     60         r = components[0];
     61         g = components[1];
     62         b = components[2];
     63         a = components[3];
     64         break;
     65     default:
     66         ASSERT_NOT_REACHED();
     67     }
     68 
     69     m_color = makeRGBA(r * 255, g * 255, b * 255, a * 255);
     70     m_valid = true;
     71 }
     72 
     73 static inline CGColorSpaceRef cachedCGColorSpace(ColorSpace colorSpace)
     74 {
     75     switch (colorSpace) {
     76     case ColorSpaceDeviceRGB:
     77         return deviceRGBColorSpaceRef();
     78     case ColorSpaceSRGB:
     79         return sRGBColorSpaceRef();
     80     case ColorSpaceLinearRGB:
     81         return linearRGBColorSpaceRef();
     82     }
     83     ASSERT_NOT_REACHED();
     84     return deviceRGBColorSpaceRef();
     85 }
     86 
     87 static CGColorRef leakCGColor(const Color& color, ColorSpace colorSpace)
     88 {
     89     CGFloat components[4];
     90     color.getRGBA(components[0], components[1], components[2], components[3]);
     91     return CGColorCreate(cachedCGColorSpace(colorSpace), components);
     92 }
     93 
     94 template<ColorSpace colorSpace> static CGColorRef cachedCGColor(const Color& color)
     95 {
     96     switch (color.rgb()) {
     97     case Color::transparent: {
     98         static CGColorRef transparentCGColor = leakCGColor(color, colorSpace);
     99         return transparentCGColor;
    100     }
    101     case Color::black: {
    102         static CGColorRef blackCGColor = leakCGColor(color, colorSpace);
    103         return blackCGColor;
    104     }
    105     case Color::white: {
    106         static CGColorRef whiteCGColor = leakCGColor(color, colorSpace);
    107         return whiteCGColor;
    108     }
    109     }
    110 
    111     ASSERT(color.rgb());
    112 
    113     const size_t cacheSize = 32;
    114     static RGBA32 cachedRGBAValues[cacheSize];
    115     static RetainPtr<CGColorRef>* cachedCGColors = new RetainPtr<CGColorRef>[cacheSize];
    116 
    117     for (size_t i = 0; i < cacheSize; ++i) {
    118         if (cachedRGBAValues[i] == color.rgb())
    119             return cachedCGColors[i].get();
    120     }
    121 
    122     CGColorRef newCGColor = leakCGColor(color, colorSpace);
    123 
    124     static size_t cursor;
    125     cachedRGBAValues[cursor] = color.rgb();
    126     cachedCGColors[cursor].adoptCF(newCGColor);
    127     if (++cursor == cacheSize)
    128         cursor = 0;
    129 
    130     return newCGColor;
    131 }
    132 
    133 CGColorRef cachedCGColor(const Color& color, ColorSpace colorSpace)
    134 {
    135     switch (colorSpace) {
    136     case ColorSpaceDeviceRGB:
    137         return cachedCGColor<ColorSpaceDeviceRGB>(color);
    138     case ColorSpaceSRGB:
    139         return cachedCGColor<ColorSpaceSRGB>(color);
    140     case ColorSpaceLinearRGB:
    141         return cachedCGColor<ColorSpaceLinearRGB>(color);
    142     }
    143     ASSERT_NOT_REACHED();
    144     return cachedCGColor(color, ColorSpaceDeviceRGB);
    145 }
    146 
    147 }
    148 
    149 #endif // USE(CG)
    150