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| ** This file is part of the QtGui module of the Qt Toolkit. |
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| |
| #include "qcolortrclut_p.h" |
| #include "qcolortransferfunction_p.h" |
| #include "qcolortransfertable_p.h" |
| #include <qmath.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| QColorTrcLut *QColorTrcLut::fromGamma(qreal gamma) |
| { |
| QColorTrcLut *cp = new QColorTrcLut; |
| |
| for (int i = 0; i <= (255 * 16); ++i) { |
| cp->m_toLinear[i] = ushort(qRound(qPow(i / qreal(255 * 16), gamma) * (255 * 256))); |
| cp->m_fromLinear[i] = ushort(qRound(qPow(i / qreal(255 * 16), qreal(1) / gamma) * (255 * 256))); |
| } |
| |
| return cp; |
| } |
| |
| QColorTrcLut *QColorTrcLut::fromTransferFunction(const QColorTransferFunction &fun) |
| { |
| QColorTrcLut *cp = new QColorTrcLut; |
| QColorTransferFunction inv = fun.inverted(); |
| |
| for (int i = 0; i <= (255 * 16); ++i) { |
| cp->m_toLinear[i] = ushort(qRound(fun.apply(i / qreal(255 * 16)) * (255 * 256))); |
| cp->m_fromLinear[i] = ushort(qRound(inv.apply(i / qreal(255 * 16)) * (255 * 256))); |
| } |
| |
| return cp; |
| } |
| |
| QColorTrcLut *QColorTrcLut::fromTransferTable(const QColorTransferTable &table) |
| { |
| QColorTrcLut *cp = new QColorTrcLut; |
| |
| float minInverse = 0.0f; |
| for (int i = 0; i <= (255 * 16); ++i) { |
| cp->m_toLinear[i] = ushort(qBound(0, qRound(table.apply(i / qreal(255 * 16)) * (255 * 256)), 65280)); |
| minInverse = table.applyInverse(i / qreal(255 * 16), minInverse); |
| cp->m_fromLinear[i] = ushort(qBound(0, qRound(minInverse * (255 * 256)), 65280)); |
| } |
| |
| return cp; |
| } |
| |
| QT_END_NAMESPACE |