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Diffstat (limited to 'src/gui/painting/qcolorspace.cpp')
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diff --git a/src/gui/painting/qcolorspace.cpp b/src/gui/painting/qcolorspace.cpp new file mode 100644 index 0000000000..937bb505c9 --- /dev/null +++ b/src/gui/painting/qcolorspace.cpp @@ -0,0 +1,796 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qcolorspace.h" +#include "qcolorspace_p.h" + +#include "qcolortransform.h" +#include "qcolormatrix_p.h" +#include "qcolortransferfunction_p.h" +#include "qcolortransform_p.h" +#include "qicc_p.h" + +#include <qmath.h> +#include <qtransform.h> + +#include <qdebug.h> + +QT_BEGIN_NAMESPACE + +QBasicMutex QColorSpacePrivate::s_lutWriteLock; + +QColorSpacePrimaries::QColorSpacePrimaries(QColorSpace::Primaries primaries) +{ + switch (primaries) { + case QColorSpace::Primaries::SRgb: + redPoint = QPointF(0.640, 0.330); + greenPoint = QPointF(0.300, 0.600); + bluePoint = QPointF(0.150, 0.060); + whitePoint = QColorVector::D65Chromaticity(); + break; + case QColorSpace::Primaries::DciP3D65: + redPoint = QPointF(0.680, 0.320); + greenPoint = QPointF(0.265, 0.690); + bluePoint = QPointF(0.150, 0.060); + whitePoint = QColorVector::D65Chromaticity(); + break; + case QColorSpace::Primaries::AdobeRgb: + redPoint = QPointF(0.640, 0.330); + greenPoint = QPointF(0.210, 0.710); + bluePoint = QPointF(0.150, 0.060); + whitePoint = QColorVector::D65Chromaticity(); + break; + case QColorSpace::Primaries::ProPhotoRgb: + redPoint = QPointF(0.7347, 0.2653); + greenPoint = QPointF(0.1596, 0.8404); + bluePoint = QPointF(0.0366, 0.0001); + whitePoint = QColorVector::D50Chromaticity(); + break; + default: + Q_UNREACHABLE(); + } +} + +bool QColorSpacePrimaries::areValid() const +{ + if (!QColorVector::isValidChromaticity(redPoint)) + return false; + if (!QColorVector::isValidChromaticity(greenPoint)) + return false; + if (!QColorVector::isValidChromaticity(bluePoint)) + return false; + if (!QColorVector::isValidChromaticity(whitePoint)) + return false; + return true; +} + +QColorMatrix QColorSpacePrimaries::toXyzMatrix() const +{ + // This converts to XYZ in some undefined scale. + QColorMatrix toXyz = { QColorVector(redPoint), + QColorVector(greenPoint), + QColorVector(bluePoint) }; + + // Since the white point should be (1.0, 1.0, 1.0) in the + // input, we can figure out the scale by using the + // inverse conversion on the white point. + QColorVector wXyz(whitePoint); + QColorVector whiteScale = toXyz.inverted().map(wXyz); + + // Now we have scaled conversion to XYZ relative to the given whitepoint + toXyz = toXyz * QColorMatrix::fromScale(whiteScale); + + // But we want a conversion to XYZ relative to D50 + QColorVector wXyzD50 = QColorVector::D50(); + + if (wXyz != wXyzD50) { + // Do chromatic adaptation to map our white point to XYZ D50. + + // The Bradford method chromatic adaptation matrix: + QColorMatrix abrad = { { 0.8951f, -0.7502f, 0.0389f }, + { 0.2664f, 1.7135f, -0.0685f }, + { -0.1614f, 0.0367f, 1.0296f } }; + QColorMatrix abradinv = { { 0.9869929f, 0.4323053f, -0.0085287f }, + { -0.1470543f, 0.5183603f, 0.0400428f }, + { 0.1599627f, 0.0492912f, 0.9684867f } }; + + QColorVector srcCone = abrad.map(wXyz); + QColorVector dstCone = abrad.map(wXyzD50); + + QColorMatrix wToD50 = { { dstCone.x / srcCone.x, 0, 0 }, + { 0, dstCone.y / srcCone.y, 0 }, + { 0, 0, dstCone.z / srcCone.z } }; + + + QColorMatrix chromaticAdaptation = abradinv * (wToD50 * abrad); + toXyz = chromaticAdaptation * toXyz; + } + + return toXyz; +} + +QColorSpacePrivate::QColorSpacePrivate() +{ +} + +QColorSpacePrivate::QColorSpacePrivate(QColorSpace::NamedColorSpace namedColorSpace) + : namedColorSpace(namedColorSpace) +{ + switch (namedColorSpace) { + case QColorSpace::SRgb: + primaries = QColorSpace::Primaries::SRgb; + transferFunction = QColorSpace::TransferFunction::SRgb; + description = QStringLiteral("sRGB"); + break; + case QColorSpace::SRgbLinear: + primaries = QColorSpace::Primaries::SRgb; + transferFunction = QColorSpace::TransferFunction::Linear; + description = QStringLiteral("Linear sRGB"); + break; + case QColorSpace::AdobeRgb: + primaries = QColorSpace::Primaries::AdobeRgb; + transferFunction = QColorSpace::TransferFunction::Gamma; + gamma = 2.19921875f; // Not quite 2.2, see https://www.adobe.com/digitalimag/pdfs/AdobeRGB1998.pdf + description = QStringLiteral("Adobe RGB"); + break; + case QColorSpace::DisplayP3: + primaries = QColorSpace::Primaries::DciP3D65; + transferFunction = QColorSpace::TransferFunction::SRgb; + description = QStringLiteral("Display P3"); + break; + case QColorSpace::ProPhotoRgb: + primaries = QColorSpace::Primaries::ProPhotoRgb; + transferFunction = QColorSpace::TransferFunction::ProPhotoRgb; + description = QStringLiteral("ProPhoto RGB"); + break; + default: + Q_UNREACHABLE(); + } + initialize(); +} + +QColorSpacePrivate::QColorSpacePrivate(QColorSpace::Primaries primaries, QColorSpace::TransferFunction fun, float gamma) + : primaries(primaries) + , transferFunction(fun) + , gamma(gamma) +{ + identifyColorSpace(); + initialize(); +} + +QColorSpacePrivate::QColorSpacePrivate(const QColorSpacePrimaries &primaries, + QColorSpace::TransferFunction fun, + float gamma) + : primaries(QColorSpace::Primaries::Custom) + , transferFunction(fun) + , gamma(gamma) +{ + Q_ASSERT(primaries.areValid()); + toXyz = primaries.toXyzMatrix(); + whitePoint = QColorVector(primaries.whitePoint); + identifyColorSpace(); + setTransferFunction(); +} + +void QColorSpacePrivate::identifyColorSpace() +{ + switch (primaries) { + case QColorSpace::Primaries::SRgb: + if (transferFunction == QColorSpace::TransferFunction::SRgb) { + namedColorSpace = QColorSpace::SRgb; + if (description.isEmpty()) + description = QStringLiteral("sRGB"); + return; + } + if (transferFunction == QColorSpace::TransferFunction::Linear) { + namedColorSpace = QColorSpace::SRgbLinear; + if (description.isEmpty()) + description = QStringLiteral("Linear sRGB"); + return; + } + break; + case QColorSpace::Primaries::AdobeRgb: + if (transferFunction == QColorSpace::TransferFunction::Gamma) { + if (qAbs(gamma - 2.19921875f) < (1/1024.0f)) { + namedColorSpace = QColorSpace::AdobeRgb; + if (description.isEmpty()) + description = QStringLiteral("Adobe RGB"); + return; + } + } + break; + case QColorSpace::Primaries::DciP3D65: + if (transferFunction == QColorSpace::TransferFunction::SRgb) { + namedColorSpace = QColorSpace::DisplayP3; + if (description.isEmpty()) + description = QStringLiteral("Display P3"); + return; + } + break; + case QColorSpace::Primaries::ProPhotoRgb: + if (transferFunction == QColorSpace::TransferFunction::ProPhotoRgb) { + namedColorSpace = QColorSpace::ProPhotoRgb; + if (description.isEmpty()) + description = QStringLiteral("ProPhoto RGB"); + return; + } + if (transferFunction == QColorSpace::TransferFunction::Gamma) { + // ProPhoto RGB's curve is effectively gamma 1.8 for 8bit precision. + if (qAbs(gamma - 1.8f) < (1/1024.0f)) { + namedColorSpace = QColorSpace::ProPhotoRgb; + if (description.isEmpty()) + description = QStringLiteral("ProPhoto RGB"); + return; + } + } + break; + default: + break; + } + + namedColorSpace = Unknown; +} + +void QColorSpacePrivate::initialize() +{ + setToXyzMatrix(); + setTransferFunction(); +} + +void QColorSpacePrivate::setToXyzMatrix() +{ + if (primaries == QColorSpace::Primaries::Custom) { + toXyz = QColorMatrix(); + whitePoint = QColorVector::D50(); + return; + } + QColorSpacePrimaries colorSpacePrimaries(primaries); + toXyz = colorSpacePrimaries.toXyzMatrix(); + whitePoint = QColorVector(colorSpacePrimaries.whitePoint); +} + +void QColorSpacePrivate::setTransferFunction() +{ + switch (transferFunction) { + case QColorSpace::TransferFunction::Linear: + trc[0].m_type = QColorTrc::Type::Function; + trc[0].m_fun = QColorTransferFunction(); + if (qFuzzyIsNull(gamma)) + gamma = 1.0f; + break; + case QColorSpace::TransferFunction::Gamma: + trc[0].m_type = QColorTrc::Type::Function; + trc[0].m_fun = QColorTransferFunction::fromGamma(gamma); + break; + case QColorSpace::TransferFunction::SRgb: + trc[0].m_type = QColorTrc::Type::Function; + trc[0].m_fun = QColorTransferFunction::fromSRgb(); + if (qFuzzyIsNull(gamma)) + gamma = 2.31f; + break; + case QColorSpace::TransferFunction::ProPhotoRgb: + trc[0].m_type = QColorTrc::Type::Function; + trc[0].m_fun = QColorTransferFunction::fromProPhotoRgb(); + if (qFuzzyIsNull(gamma)) + gamma = 1.8f; + break; + case QColorSpace::TransferFunction::Custom: + break; + default: + Q_UNREACHABLE(); + break; + } + trc[1] = trc[0]; + trc[2] = trc[0]; +} + +QColorTransform QColorSpacePrivate::transformationToColorSpace(const QColorSpacePrivate *out) const +{ + Q_ASSERT(out); + QColorTransform combined; + auto ptr = new QColorTransformPrivate; + combined.d = ptr; + combined.d->ref.ref(); + ptr->colorSpaceIn = this; + ptr->colorSpaceOut = out; + ptr->colorMatrix = out->toXyz.inverted() * toXyz; + return combined; +} + +/*! + \class QColorSpace + \brief The QColorSpace class provides a color space abstraction. + \since 5.14 + + \ingroup painting + \ingroup appearance + \inmodule QtGui + + Color values can be interpreted in different ways, and based on the interpretation + can live in different spaces. We call this \e {color spaces}. + + QColorSpace provides access to creating several predefined color spaces and + can generate QColorTransforms for converting colors from one color space to + another. + + QColorSpace can also represent color spaces defined by ICC profiles or embedded + in images, that do not otherwise fit the predefined color spaces. + + A color space can generally speaking be conceived as a combination of set of primary + colors and a transfer function. The primaries defines the axes of the color space, and + the transfer function how values are mapped on the axes. + The primaries are defined by three primary colors that represent exactly how red, green, + and blue look in this particular color space, and a white color that represents where + and how bright pure white is. The range of colors expressable by the primary colors is + called the gamut, and a color space that can represent a wider range of colors is also + known as a wide-gamut color space. + + The transfer function or gamma curve determines how each component in the + color space is encoded. These are used because human perception does not operate + linearly, and the transfer functions try to ensure that colors will seem evenly + spaced to human eyes. +*/ + + +/*! + \enum QColorSpace::NamedColorSpace + + Predefined color spaces. + + \value SRgb The sRGB color space, which Qt operates in by default. It is a close approximation + of how most classic monitors operate, and a mode most software and hardware support. + \l{http://www.color.org/chardata/rgb/srgb.xalter}{ICC registration of sRGB}. + \value SRgbLinear The sRGB color space with linear gamma. Useful for gamma-corrected blending. + \value AdobeRgb The Adobe RGB color space is a classic wide-gamut color space, using a gamma of 2.2. + \l{http://www.color.org/chardata/rgb/adobergb.xalter}{ICC registration of Adobe RGB (1998)} + \value DisplayP3 A color-space using the primaries of DCI-P3, but with the whitepoint and transfer + function of sRGB. Common in modern wide-gamut screens. + \l{http://www.color.org/chardata/rgb/DCIP3.xalter}{ICC registration of DCI-P3} + \value ProPhotoRgb The Pro Photo RGB color space, also known as ROMM RGB is a very wide gamut color space. + \l{http://www.color.org/chardata/rgb/rommrgb.xalter}{ICC registration of ROMM RGB} +*/ + +/*! + \enum QColorSpace::Primaries + + Predefined sets of primary colors. + + \value Custom The primaries are undefined or does not match any predefined sets. + \value SRgb The sRGB primaries + \value AdobeRgb The Adobe RGB primaries + \value DciP3D65 The DCI-P3 primaries with the D65 whitepoint + \value ProPhotoRgb The ProPhoto RGB primaries with the D50 whitepoint +*/ + +/*! + \enum QColorSpace::TransferFunction + + Predefined transfer functions or gamma curves. + + \value Custom The custom or null transfer function + \value Linear The linear transfer functions + \value Gamma A transfer function that is a real gamma curve based on the value of gamma() + \value SRgb The sRGB transfer function, composed of linear and gamma parts + \value ProPhotoRgb The ProPhoto RGB transfer function, composed of linear and gamma parts +*/ + +/*! + Creates a new colorspace object that represents an undefined and invalid colorspace. + */ +QColorSpace::QColorSpace() +{ +} + +/*! + Creates a new colorspace object that represents a \a namedColorSpace. + */ +QColorSpace::QColorSpace(NamedColorSpace namedColorSpace) +{ + static QColorSpacePrivate *predefinedColorspacePrivates[QColorSpace::ProPhotoRgb + 1]; + if (!predefinedColorspacePrivates[namedColorSpace]) { + predefinedColorspacePrivates[namedColorSpace] = new QColorSpacePrivate(namedColorSpace); + predefinedColorspacePrivates[namedColorSpace]->ref.ref(); + } + d_ptr = predefinedColorspacePrivates[namedColorSpace]; + d_ptr->ref.ref(); + Q_ASSERT(isValid()); +} + +/*! + Creates a custom color space with the primaries \a primaries, using the transfer function \a fun and + optionally \a gamma. + */ +QColorSpace::QColorSpace(QColorSpace::Primaries primaries, QColorSpace::TransferFunction fun, float gamma) + : d_ptr(new QColorSpacePrivate(primaries, fun, gamma)) +{ + d_ptr->ref.ref(); +} + +/*! + Creates a custom color space with the primaries \a primaries, using a gamma transfer function of + \a gamma. + */ +QColorSpace::QColorSpace(QColorSpace::Primaries primaries, float gamma) + : d_ptr(new QColorSpacePrivate(primaries, TransferFunction::Gamma, gamma)) +{ + d_ptr->ref.ref(); +} + +/*! + Creates a custom colorspace with a primaries based on the chromaticities of the primary colors \a whitePoint, + \a redPoint, \a greenPoint and \a bluePoint, and using the transfer function \a fun and optionally \a gamma. + */ +QColorSpace::QColorSpace(const QPointF &whitePoint, const QPointF &redPoint, + const QPointF &greenPoint, const QPointF &bluePoint, + QColorSpace::TransferFunction fun, float gamma) +{ + QColorSpacePrimaries primaries(whitePoint, redPoint, greenPoint, bluePoint); + if (!primaries.areValid()) { + qWarning() << "QColorSpace attempted constructed from invalid primaries:" << whitePoint << redPoint << greenPoint << bluePoint; + d_ptr = nullptr; + return; + } + d_ptr = new QColorSpacePrivate(primaries, fun, gamma); + d_ptr->ref.ref(); +} + +QColorSpace::~QColorSpace() +{ + if (d_ptr && !d_ptr->ref.deref()) + delete d_ptr; +} + +QColorSpace::QColorSpace(const QColorSpace &colorSpace) + : d_ptr(colorSpace.d_ptr) +{ + if (d_ptr) + d_ptr->ref.ref(); +} + +QColorSpace &QColorSpace::operator=(const QColorSpace &colorSpace) +{ + QColorSpacePrivate *oldD = d_ptr; + d_ptr = colorSpace.d_ptr; + if (d_ptr) + d_ptr->ref.ref(); + if (oldD && !oldD->ref.deref()) + delete oldD; + return *this; +} + +/*! \fn void QColorSpace::swap(QColorSpace &other) + + Swaps color space \a other with this color space. This operation is very fast and + never fails. +*/ + +/*! + Returns the predefined primaries of the color space + or \c primaries::Custom if it doesn't match any of them. +*/ +QColorSpace::Primaries QColorSpace::primaries() const noexcept +{ + if (Q_UNLIKELY(!d_ptr)) + return QColorSpace::Primaries::Custom; + return d_ptr->primaries; +} + +/*! + Returns the predefined transfer function of the color space + or \c TransferFunction::Custom if it doesn't match any of them. + + \sa gamma(), setTransferFunction(), withTransferFunction() +*/ +QColorSpace::TransferFunction QColorSpace::transferFunction() const noexcept +{ + if (Q_UNLIKELY(!d_ptr)) + return QColorSpace::TransferFunction::Custom; + return d_ptr->transferFunction; +} + +/*! + Returns the gamma value of color spaces with \c TransferFunction::Gamma, + an approximate gamma value for other predefined color spaces, or + 0.0 if no approximate gamma is known. + + \sa transferFunction() +*/ +float QColorSpace::gamma() const noexcept +{ + if (Q_UNLIKELY(!d_ptr)) + return 0.0f; + return d_ptr->gamma; +} + +/*! + Sets the transfer function to \a transferFunction and \a gamma. + + \sa transferFunction(), gamma(), withTransferFunction() +*/ +void QColorSpace::setTransferFunction(QColorSpace::TransferFunction transferFunction, float gamma) +{ + if (!isValid() || transferFunction == QColorSpace::TransferFunction::Custom) + return; + if (d_ptr->transferFunction == transferFunction && d_ptr->gamma == gamma) + return; + QColorSpacePrivate::getWritable(*this); // detach + d_ptr->description.clear(); + d_ptr->transferFunction = transferFunction; + d_ptr->gamma = gamma; + d_ptr->identifyColorSpace(); + d_ptr->setTransferFunction(); +} + +/*! + Returns a copy of this color space, except using the transfer function + \a transferFunction and \a gamma. + + \sa transferFunction(), gamma(), setTransferFunction() +*/ +QColorSpace QColorSpace::withTransferFunction(QColorSpace::TransferFunction transferFunction, float gamma) const +{ + if (!isValid() || transferFunction == QColorSpace::TransferFunction::Custom) + return *this; + if (d_ptr->transferFunction == transferFunction && d_ptr->gamma == gamma) + return *this; + QColorSpace out(*this); + out.setTransferFunction(transferFunction, gamma); + return out; +} + +/*! + Sets the primaries to those of the \a primariesId set. + + \sa primaries() +*/ +void QColorSpace::setPrimaries(QColorSpace::Primaries primariesId) +{ + if (!isValid() || primariesId == QColorSpace::Primaries::Custom) + return; + if (d_ptr->primaries == primariesId) + return; + QColorSpacePrivate::getWritable(*this); // detach + d_ptr->description.clear(); + d_ptr->primaries = primariesId; + d_ptr->identifyColorSpace(); + d_ptr->setToXyzMatrix(); +} + +/*! + Set primaries to the chromaticities of \a whitePoint, \a redPoint, \a greenPoint + and \a bluePoint. + + \sa primaries() +*/ +void QColorSpace::setPrimaries(const QPointF &whitePoint, const QPointF &redPoint, + const QPointF &greenPoint, const QPointF &bluePoint) +{ + if (!isValid()) + return; + QColorSpacePrimaries primaries(whitePoint, redPoint, greenPoint, bluePoint); + if (!primaries.areValid()) + return; + QColorMatrix toXyz = primaries.toXyzMatrix(); + if (QColorVector(primaries.whitePoint) == d_ptr->whitePoint && toXyz == d_ptr->toXyz) + return; + QColorSpacePrivate::getWritable(*this); // detach + d_ptr->description.clear(); + d_ptr->primaries = QColorSpace::Primaries::Custom; + d_ptr->toXyz = toXyz; + d_ptr->whitePoint = QColorVector(primaries.whitePoint); + d_ptr->identifyColorSpace(); +} + +/*! + Returns an ICC profile representing the color space. + + If the color space was generated from an ICC profile, that profile + is returned, otherwise one is generated. + + \note Even invalid color spaces may return the ICC profile if they + were generated from one, to allow applications to implement wider + support themselves. + + \sa fromIccProfile() +*/ +QByteArray QColorSpace::iccProfile() const +{ + if (Q_UNLIKELY(!d_ptr)) + return QByteArray(); + if (!d_ptr->iccProfile.isEmpty()) + return d_ptr->iccProfile; + if (!isValid()) + return QByteArray(); + return QIcc::toIccProfile(*this); +} + +/*! + Creates a QColorSpace from ICC profile \a iccProfile. + + \note Not all ICC profiles are supported. QColorSpace only supports + RGB-XYZ ICC profiles that are three-component matrix-based. + + If the ICC profile is not supported an invalid QColorSpace is returned + where you can still read the original ICC profile using iccProfile(). + + \sa iccProfile() +*/ +QColorSpace QColorSpace::fromIccProfile(const QByteArray &iccProfile) +{ + QColorSpace colorSpace; + if (QIcc::fromIccProfile(iccProfile, &colorSpace)) + return colorSpace; + QColorSpacePrivate *d = QColorSpacePrivate::getWritable(colorSpace); + d->iccProfile = iccProfile; + return colorSpace; +} + +/*! + Returns \c true if the color space is valid. +*/ +bool QColorSpace::isValid() const noexcept +{ + return d_ptr + && d_ptr->toXyz.isValid() + && d_ptr->trc[0].isValid() && d_ptr->trc[1].isValid() && d_ptr->trc[2].isValid(); +} + +/*! + \relates QColorSpace + Returns \c true if colorspace \a colorSpace1 is equal to colorspace \a colorSpace2; + otherwise returns \c false +*/ +bool operator==(const QColorSpace &colorSpace1, const QColorSpace &colorSpace2) +{ + if (colorSpace1.d_ptr == colorSpace2.d_ptr) + return true; + if (!colorSpace1.d_ptr || !colorSpace2.d_ptr) + return false; + + if (colorSpace1.d_ptr->namedColorSpace && colorSpace2.d_ptr->namedColorSpace) + return colorSpace1.d_ptr->namedColorSpace == colorSpace2.d_ptr->namedColorSpace; + + const bool valid1 = colorSpace1.isValid(); + const bool valid2 = colorSpace2.isValid(); + if (!valid1 && !valid2) + return colorSpace1.d_ptr->iccProfile == colorSpace2.d_ptr->iccProfile; + else if (!valid1 || !valid2) + return false; + + // At this point one or both color spaces are unknown but valid, and must be compared in detail instead + + if (colorSpace1.primaries() != QColorSpace::Primaries::Custom && colorSpace2.primaries() != QColorSpace::Primaries::Custom) { + if (colorSpace1.primaries() != colorSpace2.primaries()) + return false; + } else { + if (colorSpace1.d_ptr->toXyz != colorSpace2.d_ptr->toXyz) + return false; + } + + if (colorSpace1.transferFunction() != QColorSpace::TransferFunction::Custom && + colorSpace2.transferFunction() != QColorSpace::TransferFunction::Custom) { + if (colorSpace1.transferFunction() != colorSpace2.transferFunction()) + return false; + if (colorSpace1.transferFunction() == QColorSpace::TransferFunction::Gamma) + return (qAbs(colorSpace1.gamma() - colorSpace2.gamma()) <= (1.0f / 512.0f)); + return true; + } + + if (colorSpace1.d_ptr->trc[0] != colorSpace2.d_ptr->trc[0] || + colorSpace1.d_ptr->trc[1] != colorSpace2.d_ptr->trc[1] || + colorSpace1.d_ptr->trc[2] != colorSpace2.d_ptr->trc[2]) + return false; + + return true; +} + +/*! + \fn bool operator!=(const QColorSpace &colorSpace1, const QColorSpace &colorSpace2) + \relates QColorSpace + + Returns \c true if colorspace \a colorSpace1 is not equal to colorspace \a colorSpace2; + otherwise returns \c false +*/ + +/*! + Generates and returns a color space transformation from this color space to + \a colorspace. +*/ +QColorTransform QColorSpace::transformationToColorSpace(const QColorSpace &colorspace) const +{ + if (!isValid() || !colorspace.isValid()) + return QColorTransform(); + + return d_ptr->transformationToColorSpace(colorspace.d_ptr); +} + +/***************************************************************************** + QColorSpace stream functions + *****************************************************************************/ +#if !defined(QT_NO_DATASTREAM) +/*! + \fn QDataStream &operator<<(QDataStream &stream, const QColorSpace &colorSpace) + \relates QColorSpace + + Writes the given \a colorSpace to the given \a stream as an ICC profile. + + \sa QColorSpace::iccProfile(), {Serializing Qt Data Types} +*/ + +QDataStream &operator<<(QDataStream &s, const QColorSpace &image) +{ + s << image.iccProfile(); + return s; +} + +/*! + \fn QDataStream &operator>>(QDataStream &stream, QColorSpace &colorSpace) + \relates QColorSpace + + Reads a color space from the given \a stream and stores it in the given + \a colorSpace. + + \sa QColorSpace::fromIccProfile(), {Serializing Qt Data Types} +*/ + +QDataStream &operator>>(QDataStream &s, QColorSpace &colorSpace) +{ + QByteArray iccProfile; + s >> iccProfile; + colorSpace = QColorSpace::fromIccProfile(iccProfile); + return s; +} +#endif // QT_NO_DATASTREAM + +#ifndef QT_NO_DEBUG_STREAM +QDebug operator<<(QDebug dbg, const QColorSpace &colorSpace) +{ + QDebugStateSaver saver(dbg); + dbg.nospace(); + dbg << "QColorSpace("; + if (colorSpace.d_ptr->namedColorSpace) + dbg << colorSpace.d_ptr->namedColorSpace << ", "; + dbg << colorSpace.primaries() << ", " << colorSpace.transferFunction(); + dbg << ", gamma=" << colorSpace.gamma(); + dbg << ')'; + return dbg; +} +#endif + +QT_END_NAMESPACE |