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 !PLATFORM(CG)
30
31 #include <math.h>
32
33 namespace WebCore {
34
transformColorSpace(ImageColorSpace srcColorSpace,ImageColorSpace dstColorSpace)35 void ImageBuffer::transformColorSpace(ImageColorSpace srcColorSpace, ImageColorSpace dstColorSpace)
36 {
37 if (srcColorSpace == dstColorSpace)
38 return;
39
40 // only sRGB <-> linearRGB are supported at the moment
41 if ((srcColorSpace != LinearRGB && srcColorSpace != DeviceRGB) ||
42 (dstColorSpace != LinearRGB && dstColorSpace != DeviceRGB))
43 return;
44
45 Vector<int> lookUpTable;
46 if (dstColorSpace == LinearRGB) {
47 if (m_linearRgbLUT.isEmpty()) {
48 for (unsigned i = 0; i < 256; i++) {
49 float color = i / 255.0f;
50 color = (color <= 0.04045f ? color / 12.92f : pow((color + 0.055f) / 1.055f, 2.4f));
51 color = std::max(0.0f, color);
52 color = std::min(1.0f, color);
53 m_linearRgbLUT.append(static_cast<int>(color * 255));
54 }
55 }
56 platformTransformColorSpace(m_linearRgbLUT);
57 } else if (dstColorSpace == DeviceRGB) {
58 if (m_deviceRgbLUT.isEmpty()) {
59 for (unsigned i = 0; i < 256; i++) {
60 float color = i / 255.0f;
61 color = pow(1.055f * color, 1.0f / 2.4f) - 0.055f;
62 color = std::max(0.0f, color);
63 color = std::min(1.0f, color);
64 m_deviceRgbLUT.append(static_cast<int>(color * 255));
65 }
66 }
67 platformTransformColorSpace(m_deviceRgbLUT);
68 }
69 }
70
71 }
72
73 #endif // PLATFORM(CG)
74