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#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;
}

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 0;
}


QT_END_NAMESPACE