/****************************************************************************

**

** 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.

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "qplatformpixmap.h"

#include <qpa/qplatformintegration.h>

#include <QtCore/qbuffer.h>

#include <QtGui/qbitmap.h>

#include <QtGui/qimagereader.h>

#include <private/qguiapplication_p.h>

#include <private/qimagepixmapcleanuphooks_p.h>

QT_BEGIN_NAMESPACE

/*!

    \class QPlatformPixmap

    \since 5.0

    \internal

    \preliminary

    \ingroup qpa

    \brief The QPlatformPixmap class provides an abstraction for native pixmaps.

 */

QPlatformPixmap *QPlatformPixmap::create(int w, int h, PixelType type)

{

    if (Q_UNLIKELY(!QGuiApplicationPrivate::platformIntegration()))

        qFatal("QPlatformPixmap: QGuiApplication required");

    QPlatformPixmap *data = QGuiApplicationPrivate::platformIntegration()->createPlatformPixmap(static_cast<QPlatformPixmap::PixelType>(type));

    data->resize(w, h);

    return data;

}

QPlatformPixmap::QPlatformPixmap(PixelType pixelType, int objectId)

    : w(0),

      h(0),

      d(0),

      is_null(true),

      ref(0),

      detach_no(0),

      type(pixelType),

      id(objectId),

      ser_no(0),

      is_cached(false)

{

}

QPlatformPixmap::~QPlatformPixmap()

{

    // Sometimes the pixmap cleanup hooks will be called from derrived classes, which will

    // then set is_cached to false. For example, on X11 Qt GUI needs to delete the GLXPixmap

    // or EGL Pixmap Surface for a given pixmap _before_ the native X11 pixmap is deleted,

    // otherwise some drivers will leak the GL surface. In this case, QX11PlatformPixmap will

    // call the cleanup hooks itself before deleting the native pixmap and set is_cached to

    // false.

    if (is_cached) {

        QImagePixmapCleanupHooks::executePlatformPixmapDestructionHooks(this);

        is_cached = false;

    }

}

QPlatformPixmap *QPlatformPixmap::createCompatiblePlatformPixmap() const

{

    QPlatformPixmap *d = QGuiApplicationPrivate::platformIntegration()->createPlatformPixmap(pixelType());

    return d;

}

static QImage makeBitmapCompliantIfNeeded(QPlatformPixmap *d, const QImage &image, Qt::ImageConversionFlags flags)

{

    if (d->pixelType() == QPlatformPixmap::BitmapType) {

        QImage img = image.convertToFormat(QImage::Format_MonoLSB, flags);

        // make sure image.color(0) == Qt::color0 (white)

        // and image.color(1) == Qt::color1 (black)

        const QRgb c0 = QColor(Qt::black).rgb();

        const QRgb c1 = QColor(Qt::white).rgb();

        if (img.color(0) == c0 && img.color(1) == c1) {

            img.invertPixels();

            img.setColor(0, c1);

            img.setColor(1, c0);

        }

        return img;

    }

    return image;

}

void QPlatformPixmap::fromImageReader(QImageReader *imageReader,

                                  Qt::ImageConversionFlags flags)

{

    const QImage image = imageReader->read();

    fromImage(image, flags);

}

bool QPlatformPixmap::fromFile(const QString &fileName, const char *format,

                           Qt::ImageConversionFlags flags)

{

    QImage image = QImageReader(fileName, format).read();

    if (image.isNull())

        return false;

    fromImage(makeBitmapCompliantIfNeeded(this, image, flags), flags);

    return !isNull();

}

bool QPlatformPixmap::fromData(const uchar *buf, uint len, const char *format, Qt::ImageConversionFlags flags)

{

    QByteArray a = QByteArray::fromRawData(reinterpret_cast<const char *>(buf), len);

    QBuffer b(&a);

    b.open(QIODevice::ReadOnly);

    QImage image = QImageReader(&b, format).read();

    if (image.isNull())

        return false;

    fromImage(makeBitmapCompliantIfNeeded(this, image, flags), flags);

    return !isNull();

}

void QPlatformPixmap::copy(const QPlatformPixmap *data, const QRect &rect)

{

    fromImage(data->toImage(rect), Qt::NoOpaqueDetection);

}

bool QPlatformPixmap::scroll(int dx, int dy, const QRect &rect)

{

    Q_UNUSED(dx);

    Q_UNUSED(dy);

    Q_UNUSED(rect);

    return false;

}

QBitmap QPlatformPixmap::mask() const

{

    if (!hasAlphaChannel())

        return QBitmap();

    const QImage img = toImage();

    bool shouldConvert = (img.format() != QImage::Format_ARGB32 && img.format() != QImage::Format_ARGB32_Premultiplied);

    const QImage image = (shouldConvert ? img.convertToFormat(QImage::Format_ARGB32_Premultiplied) : img);

    const int w = image.width();

    const int h = image.height();

    QImage mask(w, h, QImage::Format_MonoLSB);

    if (mask.isNull()) // allocation failed

        return QBitmap();

    mask.setDevicePixelRatio(devicePixelRatio());

    mask.setColorCount(2);

    mask.setColor(0, QColor(Qt::color0).rgba());

    mask.setColor(1, QColor(Qt::color1).rgba());

    const int bpl = mask.bytesPerLine();

    for (int y = 0; y < h; ++y) {

        const QRgb *src = reinterpret_cast<const QRgb*>(image.scanLine(y));

        uchar *dest = mask.scanLine(y);

        memset(dest, 0, bpl);

        for (int x = 0; x < w; ++x) {

            if (qAlpha(*src) > 0)

                dest[x >> 3] |= (1 << (x & 7));

            ++src;

        }

    }

    return QBitmap::fromImage(mask);

}

void QPlatformPixmap::setMask(const QBitmap &mask)

{

    QImage image = toImage();

    if (mask.size().isEmpty()) {

        if (image.depth() != 1) { // hw: ????

            image = image.convertToFormat(QImage::Format_RGB32);

        }

    } else {

        const int w = image.width();

        const int h = image.height();

        switch (image.depth()) {

        case 1: {

            const QImage imageMask = mask.toImage().convertToFormat(image.format());

            for (int y = 0; y < h; ++y) {

                const uchar *mscan = imageMask.scanLine(y);

                uchar *tscan = image.scanLine(y);

                int bytesPerLine = image.bytesPerLine();

                for (int i = 0; i < bytesPerLine; ++i)

                    tscan[i] &= mscan[i];

            }

            break;

        }

        default: {

            const QImage imageMask = mask.toImage().convertToFormat(QImage::Format_MonoLSB);

            image = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);

            for (int y = 0; y < h; ++y) {

                const uchar *mscan = imageMask.scanLine(y);

                QRgb *tscan = (QRgb *)image.scanLine(y);

                for (int x = 0; x < w; ++x) {

                    if (!(mscan[x>>3] & (1 << (x&7))))

                        tscan[x] = 0;

                }

            }

            break;

        }

        }

    }

    fromImage(image, Qt::AutoColor);

}

QPixmap QPlatformPixmap::transformed(const QTransform &matrix,

                                     Qt::TransformationMode mode) const

{

    return QPixmap::fromImage(toImage().transformed(matrix, mode));

}

void QPlatformPixmap::setSerialNumber(int serNo)

{

    ser_no = serNo;

}

void QPlatformPixmap::setDetachNumber(int detNo)

{

    detach_no = detNo;

}

QImage QPlatformPixmap::toImage(const QRect &rect) const

{

    if (rect.contains(QRect(0, 0, w, h)))

        return toImage();

    else

        return toImage().copy(rect);

}

QImage* QPlatformPixmap::buffer()

{

    return nullptr;

}

QT_END_NAMESPACE