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 /*
  *  Copyright (c) 2006 Cyrille Berger <cberger@cberger.net>
  *  Copyright (c) 2007 Emanuele Tamponi <emanuele@valinor.it>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
 */
 
 #ifndef KOCOLORSPACEABSTRACT_H
 #define KOCOLORSPACEABSTRACT_H
 
 #include <QBitArray>
 #include <klocalizedstring.h>
 
 #include <KoColorSpace.h>
 #include <KoColorProfile.h>
 #include <KoColorSpaceMaths.h>
 #include <KoColorSpaceRegistry.h>
 #include "KoFallBackColorTransformation.h"
 #include "KoLabDarkenColorTransformation.h"
 #include "KoMixColorsOpImpl.h"
 
 #include "KoConvolutionOpImpl.h"
 #include "KoInvertColorTransformation.h"
 
 
 /**
  * This in an implementation of KoColorSpace which can be used as a base for colorspaces with as many
  * different channels of the same type.
  *
  * The template parameters must be a class which inherits KoColorSpaceTrait (or a class with the same signature).
  *
  * SOMETYPE is the type of the channel for instance (quint8, quint32...),
  * SOMENBOFCHANNELS is the number of channels including the alpha channel
  * SOMEALPHAPOS is the position of the alpha channel in the pixel (can be equal to -1 if no alpha channel).
  */
 template<class _CSTrait>
 class KoColorSpaceAbstract : public KoColorSpace
 {
 public:
     KoColorSpaceAbstract(const QString &id, const QString &name) :
         KoColorSpace(id, name, new KoMixColorsOpImpl< _CSTrait>(), new KoConvolutionOpImpl< _CSTrait>()) {
     }
 
     quint32 colorChannelCount() const override {
         if (_CSTrait::alpha_pos == -1)
             return _CSTrait::channels_nb;
         else
             return _CSTrait::channels_nb - 1;
     }
 
     quint32 channelCount() const override {
         return _CSTrait::channels_nb;
     }
 
     quint32 pixelSize() const override {
         return _CSTrait::pixelSize;
     }
 
     QString channelValueText(const quint8 *pixel, quint32 channelIndex) const override {
         return _CSTrait::channelValueText(pixel, channelIndex);
     }
 
     QString normalisedChannelValueText(const quint8 *pixel, quint32 channelIndex) const override {
         return _CSTrait::normalisedChannelValueText(pixel, channelIndex);
     }
 
     void normalisedChannelsValue(const quint8 *pixel, QVector<qreal> &channels) const override {
         return _CSTrait::normalisedChannelsValue(pixel, channels);
     }
 
     void fromNormalisedChannelsValue(quint8 *pixel, const QVector<qreal> &values) const override {
         return _CSTrait::fromNormalisedChannelsValue(pixel, values);
     }
 
     quint8 scaleToU8(const quint8 * srcPixel, qint32 channelIndex) const override {
         typename _CSTrait::channels_type c = _CSTrait::nativeArray(srcPixel)[channelIndex];
         return KoColorSpaceMaths<typename _CSTrait::channels_type, quint8>::scaleToA(c);
     }
 
     void singleChannelPixel(quint8 *dstPixel, const quint8 *srcPixel, quint32 channelIndex) const override {
         _CSTrait::singleChannelPixel(dstPixel, srcPixel, channelIndex);
     }
 
     quint8 opacityU8(const quint8 * U8_pixel) const override {
         return _CSTrait::opacityU8(U8_pixel);
     }
 
     qreal opacityF(const quint8 * U8_pixel) const override {
         return _CSTrait::opacityF(U8_pixel);
     }
 
     void setOpacity(quint8 * pixels, quint8 alpha, qint32 nPixels) const override {
         _CSTrait::setOpacity(pixels, alpha, nPixels);
     }
 
     void setOpacity(quint8 * pixels, qreal alpha, qint32 nPixels) const override {
         _CSTrait::setOpacity(pixels, alpha, nPixels);
     }
 
     void multiplyAlpha(quint8 * pixels, quint8 alpha, qint32 nPixels) const override {
         _CSTrait::multiplyAlpha(pixels, alpha, nPixels);
     }
 
     void applyAlphaU8Mask(quint8 * pixels, const quint8 * alpha, qint32 nPixels) const override {
         _CSTrait::applyAlphaU8Mask(pixels, alpha, nPixels);
     }
 
     void applyInverseAlphaU8Mask(quint8 * pixels, const quint8 * alpha, qint32 nPixels) const override {
         _CSTrait::applyInverseAlphaU8Mask(pixels, alpha, nPixels);
     }
 
     void applyAlphaNormedFloatMask(quint8 * pixels, const float * alpha, qint32 nPixels) const override {
         _CSTrait::applyAlphaNormedFloatMask(pixels, alpha, nPixels);
     }
 
     void applyInverseNormedFloatMask(quint8 * pixels, const float * alpha, qint32 nPixels) const override {
         _CSTrait::applyInverseAlphaNormedFloatMask(pixels, alpha, nPixels);
     }
 
     quint8 intensity8(const quint8 * src) const override {
         QColor c;
         const_cast<KoColorSpaceAbstract<_CSTrait> *>(this)->toQColor(src, &c);
         return static_cast<quint8>((c.red() * 0.30 + c.green() * 0.59 + c.blue() * 0.11) + 0.5);
     }
 
     KoColorTransformation* createInvertTransformation() const override {
         return new KoInvertColorTransformation(this);
     }
 
     KoColorTransformation *createDarkenAdjustment(qint32 shade, bool compensate, qreal compensation) const override {
         return new KoFallBackColorTransformation(this, KoColorSpaceRegistry::instance()->lab16(""), new KoLabDarkenColorTransformation<quint16>(shade, compensate, compensation, KoColorSpaceRegistry::instance()->lab16("")));
     }
 
     bool convertPixelsTo(const quint8 *src,
                                  quint8 *dst, const KoColorSpace *dstColorSpace,
                                  quint32 numPixels,
                                  KoColorConversionTransformation::Intent renderingIntent,
                                  KoColorConversionTransformation::ConversionFlags conversionFlags) const override
     {
         
         // check whether we have the same profile and color model, but only a different bit
         // depth; in that case we don't convert as such, but scale
         bool scaleOnly = false;
 
         // Note: getting the id() is really, really expensive, so only do that if
         // we are sure there is a difference between the colorspaces
         if (!(*this == *dstColorSpace)) {
             scaleOnly = dstColorSpace->colorModelId().id() == colorModelId().id() &&
                          dstColorSpace->colorDepthId().id() != colorDepthId().id() &&
                          dstColorSpace->profile()->name()   == profile()->name();
         }
         
         if (scaleOnly && dynamic_cast<const KoColorSpaceAbstract*>(dstColorSpace)) {
             typedef typename _CSTrait::channels_type channels_type;
             
             switch(dstColorSpace->channels().at(0)->channelValueType())
             {
             case KoChannelInfo::UINT8:
                 scalePixels<_CSTrait::pixelSize, 1, channels_type, quint8>(src, dst, numPixels);
                 return true;
 //             case KoChannelInfo::INT8:
 //                 scalePixels<_CSTrait::pixelSize, 1, channels_type, qint8>(src, dst, numPixels);
 //                 return true;
             case KoChannelInfo::UINT16:
                 scalePixels<_CSTrait::pixelSize, 2, channels_type, quint16>(src, dst, numPixels);
                 return true;
             case KoChannelInfo::INT16:
                 scalePixels<_CSTrait::pixelSize, 2, channels_type, qint16>(src, dst, numPixels);
                 return true;
             case KoChannelInfo::UINT32:
                 scalePixels<_CSTrait::pixelSize, 4, channels_type, quint32>(src, dst, numPixels);
                 return true;
             default:
                 break;
             }
         }
         
         return KoColorSpace::convertPixelsTo(src, dst, dstColorSpace, numPixels, renderingIntent, conversionFlags);
     }
     
 private:
     template<int srcPixelSize, int dstChannelSize, class TSrcChannel, class TDstChannel>
     void scalePixels(const quint8* src, quint8* dst, quint32 numPixels) const {
         qint32 dstPixelSize = dstChannelSize * _CSTrait::channels_nb;
         
         for(quint32 i=0; i<numPixels; ++i) {
             const TSrcChannel* srcPixel = reinterpret_cast<const TSrcChannel*>(src + i * srcPixelSize);
             TDstChannel*       dstPixel = reinterpret_cast<TDstChannel*>(dst + i * dstPixelSize);
             
             for(quint32 c=0; c<_CSTrait::channels_nb; ++c)
                 dstPixel[c] = Arithmetic::scale<TDstChannel>(srcPixel[c]);
         }
     }
 };
 
 #endif // KOCOLORSPACEABSTRACT_H