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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QRGB_H
#define QRGB_H
#include <QtCore/qglobal.h>
#include <QtCore/qprocessordetection.h>
#if defined(__SSE4_1__)
#include <smmintrin.h>
#elif defined(__SSE2__)
#include <emmintrin.h>
#endif
QT_BEGIN_NAMESPACE
typedef unsigned int QRgb; // RGB triplet
// non-namespaced Qt global variable
const Q_DECL_UNUSED QRgb RGB_MASK = 0x00ffffff; // masks RGB values
inline Q_DECL_CONSTEXPR int qRed(QRgb rgb) // get red part of RGB
{ return ((rgb >> 16) & 0xff); }
inline Q_DECL_CONSTEXPR int qGreen(QRgb rgb) // get green part of RGB
{ return ((rgb >> 8) & 0xff); }
inline Q_DECL_CONSTEXPR int qBlue(QRgb rgb) // get blue part of RGB
{ return (rgb & 0xff); }
inline Q_DECL_CONSTEXPR int qAlpha(QRgb rgb) // get alpha part of RGBA
{ return rgb >> 24; }
inline Q_DECL_CONSTEXPR QRgb qRgb(int r, int g, int b)// set RGB value
{ return (0xffu << 24) | ((r & 0xff) << 16) | ((g & 0xff) << 8) | (b & 0xff); }
inline Q_DECL_CONSTEXPR QRgb qRgba(int r, int g, int b, int a)// set RGBA value
{ return ((a & 0xff) << 24) | ((r & 0xff) << 16) | ((g & 0xff) << 8) | (b & 0xff); }
inline Q_DECL_CONSTEXPR int qGray(int r, int g, int b)// convert R,G,B to gray 0..255
{ return (r*11+g*16+b*5)/32; }
inline Q_DECL_CONSTEXPR int qGray(QRgb rgb) // convert RGB to gray 0..255
{ return qGray(qRed(rgb), qGreen(rgb), qBlue(rgb)); }
inline Q_DECL_CONSTEXPR bool qIsGray(QRgb rgb)
{ return qRed(rgb) == qGreen(rgb) && qRed(rgb) == qBlue(rgb); }
inline Q_DECL_RELAXED_CONSTEXPR QRgb qPremultiply(QRgb x)
{
const uint a = qAlpha(x);
uint t = (x & 0xff00ff) * a;
t = (t + ((t >> 8) & 0xff00ff) + 0x800080) >> 8;
t &= 0xff00ff;
x = ((x >> 8) & 0xff) * a;
x = (x + ((x >> 8) & 0xff) + 0x80);
x &= 0xff00;
return x | t | (a << 24);
}
Q_GUI_EXPORT extern const uint qt_inv_premul_factor[];
#if defined(__SSE2__)
inline QRgb qUnpremultiply(QRgb p)
{
const uint alpha = qAlpha(p);
if (alpha == 255 || alpha == 0)
return p;
const uint invAlpha = qt_inv_premul_factor[alpha];
const __m128i via = _mm_set1_epi32(invAlpha);
const __m128i vr = _mm_set1_epi32(0x8000);
#ifdef __SSE4_1__
__m128i vl = _mm_cvtepu8_epi32(_mm_cvtsi32_si128(p));
vl = _mm_mullo_epi32(vl, via);
#else
__m128i vl = _mm_unpacklo_epi8(_mm_cvtsi32_si128(p), _mm_setzero_si128());
vl = _mm_unpacklo_epi16(vl, vl);
__m128i vll = _mm_mullo_epi16(vl, via);
__m128i vlh = _mm_mulhi_epu16(vl, via);
vl = _mm_add_epi32(vll, _mm_slli_epi32(vlh, 16));
#endif
vl = _mm_add_epi32(vl, vr);
vl = _mm_srli_epi32(vl, 16);
vl = _mm_packs_epi32(vl, _mm_setzero_si128());
vl = _mm_insert_epi16(vl, alpha, 3);
vl = _mm_packus_epi16(vl, _mm_setzero_si128());
return _mm_cvtsi128_si32(vl);
}
#else
inline QRgb qUnpremultiply(QRgb p)
{
const uint alpha = qAlpha(p);
// Alpha 255 and 0 are the two most common values, which makes them beneficial to short-cut.
if (alpha == 255 || alpha == 0)
return p;
// (p*(0x00ff00ff/alpha)) >> 16 == (p*255)/alpha for all p and alpha <= 256.
const uint invAlpha = qt_inv_premul_factor[alpha];
// We add 0x8000 to get even rounding. The rounding also ensures that qPremultiply(qUnpremultiply(p)) == p for all p.
return qRgba((qRed(p)*invAlpha + 0x8000)>>16, (qGreen(p)*invAlpha + 0x8000)>>16, (qBlue(p)*invAlpha + 0x8000)>>16, alpha);
}
#endif
QT_END_NAMESPACE
#endif // QRGB_H
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