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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qcolormap.h"
#include "qcolor.h"
#include "qpaintdevice.h"
#include "qscreen.h"
#include "qguiapplication.h"
QT_BEGIN_NAMESPACE
class QColormapPrivate
{
public:
inline QColormapPrivate()
: ref(1), mode(QColormap::Direct), depth(0), numcolors(0)
{ }
QAtomicInt ref;
QColormap::Mode mode;
int depth;
int numcolors;
};
static QColormapPrivate *screenMap = nullptr;
void QColormap::initialize()
{
screenMap = new QColormapPrivate;
if (Q_UNLIKELY(!QGuiApplication::primaryScreen())) {
qWarning("no screens available, assuming 24-bit color");
screenMap->depth = 24;
screenMap->mode = QColormap::Direct;
return;
}
screenMap->depth = QGuiApplication::primaryScreen()->depth();
if (screenMap->depth < 8) {
screenMap->mode = QColormap::Indexed;
screenMap->numcolors = 256;
} else {
screenMap->mode = QColormap::Direct;
screenMap->numcolors = -1;
}
}
void QColormap::cleanup()
{
delete screenMap;
screenMap = nullptr;
}
QColormap QColormap::instance(int /*screen*/)
{
return QColormap();
}
QColormap::QColormap()
: d(screenMap)
{ d->ref.ref(); }
QColormap::QColormap(const QColormap &colormap)
:d (colormap.d)
{ d->ref.ref(); }
QColormap::~QColormap()
{
if (!d->ref.deref())
delete d;
}
QColormap::Mode QColormap::mode() const
{ return d->mode; }
int QColormap::depth() const
{ return d->depth; }
int QColormap::size() const
{
return d->numcolors;
}
#ifndef QT_QWS_DEPTH16_RGB
#define QT_QWS_DEPTH16_RGB 565
#endif
static const int qt_rbits = (QT_QWS_DEPTH16_RGB/100);
static const int qt_gbits = (QT_QWS_DEPTH16_RGB/10%10);
static const int qt_bbits = (QT_QWS_DEPTH16_RGB%10);
static const int qt_red_shift = qt_bbits+qt_gbits-(8-qt_rbits);
static const int qt_green_shift = qt_bbits-(8-qt_gbits);
static const int qt_neg_blue_shift = 8-qt_bbits;
static const int qt_blue_mask = (1<<qt_bbits)-1;
static const int qt_green_mask = (1<<(qt_gbits+qt_bbits))-(1<<qt_bbits);
static const int qt_red_mask = (1<<(qt_rbits+qt_gbits+qt_bbits))-(1<<(qt_gbits+qt_bbits));
static const int qt_red_rounding_shift = qt_red_shift + qt_rbits;
static const int qt_green_rounding_shift = qt_green_shift + qt_gbits;
static const int qt_blue_rounding_shift = qt_bbits - qt_neg_blue_shift;
inline ushort qt_convRgbTo16(QRgb c)
{
const int tr = qRed(c) << qt_red_shift;
const int tg = qGreen(c) << qt_green_shift;
const int tb = qBlue(c) >> qt_neg_blue_shift;
return (tb & qt_blue_mask) | (tg & qt_green_mask) | (tr & qt_red_mask);
}
inline QRgb qt_conv16ToRgb(ushort c)
{
const int r=(c & qt_red_mask);
const int g=(c & qt_green_mask);
const int b=(c & qt_blue_mask);
const int tr = r >> qt_red_shift | r >> qt_red_rounding_shift;
const int tg = g >> qt_green_shift | g >> qt_green_rounding_shift;
const int tb = b << qt_neg_blue_shift | b >> qt_blue_rounding_shift;
return qRgb(tr,tg,tb);
}
uint QColormap::pixel(const QColor &color) const
{
QRgb rgb = color.rgba();
if (d->mode == QColormap::Direct) {
switch(d->depth) {
case 16:
return qt_convRgbTo16(rgb);
case 24:
case 32:
{
const int r = qRed(rgb);
const int g = qGreen(rgb);
const int b = qBlue(rgb);
const int red_shift = 16;
const int green_shift = 8;
const int red_mask = 0xff0000;
const int green_mask = 0x00ff00;
const int blue_mask = 0x0000ff;
const int tg = g << green_shift;
const int tr = r << red_shift;
return 0xff000000 | (b & blue_mask) | (tg & green_mask) | (tr & red_mask);
}
}
}
//XXX
//return qt_screen->alloc(qRed(rgb), qGreen(rgb), qBlue(rgb));
return 0;
}
const QColor QColormap::colorAt(uint pixel) const
{
if (d->mode == Direct) {
if (d->depth == 16) {
pixel = qt_conv16ToRgb(pixel);
}
const int red_shift = 16;
const int green_shift = 8;
const int red_mask = 0xff0000;
const int green_mask = 0x00ff00;
const int blue_mask = 0x0000ff;
return QColor((pixel & red_mask) >> red_shift,
(pixel & green_mask) >> green_shift,
(pixel & blue_mask));
}
#if 0 // XXX
Q_ASSERT_X(int(pixel) < qt_screen->numCols(), "QColormap::colorAt", "pixel out of bounds of palette");
return QColor(qt_screen->clut()[pixel]);
#endif
return QColor();
}
const QList<QColor> QColormap::colormap() const
{
return QList<QColor>();
}
QColormap &QColormap::operator=(const QColormap &colormap)
{ qAtomicAssign(d, colormap.d); return *this; }
QT_END_NAMESPACE
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