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      1 /*
      2  * Copyright (C) 2009 Dirk Schulze <krit (at) 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 
     33 namespace WebCore {
     34 
     35 void 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