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Diffstat (limited to 'src/gui/painting/qcolorprofile_p.h')
| -rw-r--r-- | src/gui/painting/qcolorprofile_p.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/src/gui/painting/qcolorprofile_p.h b/src/gui/painting/qcolorprofile_p.h new file mode 100644 index 0000000000..ca1786ee6d --- /dev/null +++ b/src/gui/painting/qcolorprofile_p.h @@ -0,0 +1,157 @@ +/**************************************************************************** +** +** Copyright (C) 2016 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. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QCOLORPROFILE_P_H +#define QCOLORPROFILE_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#include <QtGui/private/qtguiglobal_p.h> +#include <QtGui/qrgb.h> +#include <QtGui/qrgba64.h> + +QT_BEGIN_NAMESPACE + +class Q_GUI_EXPORT QColorProfile +{ +public: + static QColorProfile *fromGamma(qreal gamma); + static QColorProfile *fromSRgb(); + + // The following methods all convert opaque or unpremultiplied colors: + + QRgba64 toLinear64(QRgb rgb32) const + { + ushort r = m_toLinear[qRed(rgb32) << 4]; + ushort g = m_toLinear[qGreen(rgb32) << 4]; + ushort b = m_toLinear[qBlue(rgb32) << 4]; + r = r + (r >> 8); + g = g + (g >> 8); + b = b + (b >> 8); + return QRgba64::fromRgba64(r, g, b, qAlpha(rgb32) * 257); + } + + QRgb toLinear(QRgb rgb32) const + { + uchar r = (m_toLinear[qRed(rgb32) << 4] + 0x80) >> 8; + uchar g = (m_toLinear[qGreen(rgb32) << 4] + 0x80) >> 8; + uchar b = (m_toLinear[qBlue(rgb32) << 4] + 0x80) >> 8; + return qRgba(r, g, b, qAlpha(rgb32)); + } + + QRgba64 toLinear(QRgba64 rgb64) const + { + ushort r = rgb64.red(); + ushort g = rgb64.green(); + ushort b = rgb64.blue(); + r = r - (r >> 8); + g = g - (g >> 8); + b = b - (b >> 8); + r = m_toLinear[r >> 4]; + g = m_toLinear[g >> 4]; + b = m_toLinear[b >> 4]; + r = r + (r >> 8); + g = g + (g >> 8); + b = b + (b >> 8); + return QRgba64::fromRgba64(r, g, b, rgb64.alpha()); + } + + QRgb fromLinear64(QRgba64 rgb64) const + { + ushort r = rgb64.red(); + ushort g = rgb64.green(); + ushort b = rgb64.blue(); + r = r - (r >> 8); + g = g - (g >> 8); + b = b - (b >> 8); + r = (m_fromLinear[r >> 4] + 0x80) >> 8; + g = (m_fromLinear[g >> 4] + 0x80) >> 8; + b = (m_fromLinear[b >> 4] + 0x80) >> 8; + return qRgba(r, g, b, rgb64.alpha8()); + } + + QRgb fromLinear(QRgb rgb32) const + { + uchar r = (m_fromLinear[qRed(rgb32) << 4] + 0x80) >> 8; + uchar g = (m_fromLinear[qGreen(rgb32) << 4] + 0x80) >> 8; + uchar b = (m_fromLinear[qBlue(rgb32) << 4] + 0x80) >> 8; + return qRgba(r, g, b, qAlpha(rgb32)); + } + + QRgba64 fromLinear(QRgba64 rgb64) const + { + ushort r = rgb64.red(); + ushort g = rgb64.green(); + ushort b = rgb64.blue(); + r = r - (r >> 8); + g = g - (g >> 8); + b = b - (b >> 8); + r = m_fromLinear[r >> 4]; + g = m_fromLinear[g >> 4]; + b = m_fromLinear[b >> 4]; + r = r + (r >> 8); + g = g + (g >> 8); + b = b + (b >> 8); + return QRgba64::fromRgba64(r, g, b, rgb64.alpha()); + } + +private: + QColorProfile() { } + + // We translate to 0-65280 (255*256) instead to 0-65535 to make simple + // shifting an accurate conversion. + // We translate from 0-4080 (255*16) for the same speed up, and to keep + // the tables small enough to fit in most inner caches. + ushort m_toLinear[(255 * 16) + 1]; // [0-4080] -> [0-65280] + ushort m_fromLinear[(255 * 16) + 1]; // [0-4080] -> [0-65280] + +}; + +QT_END_NAMESPACE + +#endif // QCOLORPROFILE_P_H |