1/*
2 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
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 "ImageBuffer.h"
28
29#if !USE(CG)
30
31#include <math.h>
32
33namespace WebCore {
34
35void ImageBuffer::transformColorSpace(ColorSpace srcColorSpace, ColorSpace dstColorSpace)
36{
37    if (srcColorSpace == dstColorSpace)
38        return;
39
40    // only sRGB <-> linearRGB are supported at the moment
41    if ((srcColorSpace != ColorSpaceLinearRGB && srcColorSpace != ColorSpaceDeviceRGB)
42        || (dstColorSpace != ColorSpaceLinearRGB && dstColorSpace != ColorSpaceDeviceRGB))
43        return;
44
45    if (dstColorSpace == ColorSpaceLinearRGB) {
46        if (m_linearRgbLUT.isEmpty()) {
47            for (unsigned i = 0; i < 256; i++) {
48                float color = i  / 255.0f;
49                color = (color <= 0.04045f ? color / 12.92f : pow((color + 0.055f) / 1.055f, 2.4f));
50                color = std::max(0.0f, color);
51                color = std::min(1.0f, color);
52                m_linearRgbLUT.append(static_cast<int>(color * 255));
53            }
54        }
55        platformTransformColorSpace(m_linearRgbLUT);
56    } else if (dstColorSpace == ColorSpaceDeviceRGB) {
57        if (m_deviceRgbLUT.isEmpty()) {
58            for (unsigned i = 0; i < 256; i++) {
59                float color = i / 255.0f;
60                color = (powf(color, 1.0f / 2.4f) * 1.055f) - 0.055f;
61                color = std::max(0.0f, color);
62                color = std::min(1.0f, color);
63                m_deviceRgbLUT.append(static_cast<int>(color * 255));
64            }
65        }
66        platformTransformColorSpace(m_deviceRgbLUT);
67    }
68}
69
70}
71
72#endif // USE(CG)
73