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

#include <qdebug.h>

#include "qnativeimage_p.h"

#include "qcolormap.h"

#include "private/qpaintengine_raster_p.h"

#if defined(Q_WS_X11) && !defined(QT_NO_MITSHM)

#include <qx11info_x11.h>

#include <sys/ipc.h>

#include <sys/shm.h>

#include <qwidget.h>

#endif

#ifdef Q_WS_MAC

#include <private/qpaintengine_mac_p.h>

#endif

QT_BEGIN_NAMESPACE

#ifdef Q_WS_WIN

typedef struct {

    BITMAPINFOHEADER bmiHeader;

    DWORD redMask;

    DWORD greenMask;

    DWORD blueMask;

} BITMAPINFO_MASK;

QNativeImage::QNativeImage(int width, int height, QImage::Format format, bool isTextBuffer, QWidget *)

{

#ifndef Q_WS_WINCE

    Q_UNUSED(isTextBuffer);

#endif

    BITMAPINFO_MASK bmi;

    memset(&bmi, 0, sizeof(bmi));

    bmi.bmiHeader.biSize        = sizeof(BITMAPINFOHEADER);

    bmi.bmiHeader.biWidth       = width;

    bmi.bmiHeader.biHeight      = -height;

    bmi.bmiHeader.biPlanes      = 1;

    bmi.bmiHeader.biSizeImage   = 0;

    if (format == QImage::Format_RGB16) {

        bmi.bmiHeader.biBitCount = 16;

#ifdef Q_WS_WINCE

        if (isTextBuffer) {

            bmi.bmiHeader.biCompression = BI_RGB;

            bmi.redMask = 0;

            bmi.greenMask = 0;

            bmi.blueMask = 0;

        } else

#endif

        {

            bmi.bmiHeader.biCompression = BI_BITFIELDS;

            bmi.redMask = 0xF800;

            bmi.greenMask = 0x07E0;

            bmi.blueMask = 0x001F;

        }

    } else {

        bmi.bmiHeader.biBitCount    = 32;

        bmi.bmiHeader.biCompression = BI_RGB;

        bmi.redMask = 0;

        bmi.greenMask = 0;

        bmi.blueMask = 0;

    }

    HDC display_dc = GetDC(0);

    hdc = CreateCompatibleDC(display_dc);

    ReleaseDC(0, display_dc);

    Q_ASSERT(hdc);

    uchar *bits = 0;

    bitmap = CreateDIBSection(hdc, reinterpret_cast<BITMAPINFO *>(&bmi), DIB_RGB_COLORS, (void**) &bits, 0, 0);

    Q_ASSERT(bitmap);

    Q_ASSERT(bits);

    null_bitmap = (HBITMAP)SelectObject(hdc, bitmap);

    image = QImage(bits, width, height, format);

    Q_ASSERT(image.paintEngine()->type() == QPaintEngine::Raster);

    static_cast<QRasterPaintEngine *>(image.paintEngine())->setDC(hdc);

#ifndef Q_WS_WINCE

    GdiFlush();

#endif

}

QNativeImage::~QNativeImage()

{

    if (bitmap || hdc) {

        Q_ASSERT(hdc);

        Q_ASSERT(bitmap);

        if (null_bitmap)

            SelectObject(hdc, null_bitmap);

        DeleteDC(hdc);

        DeleteObject(bitmap);

    }

}

QImage::Format QNativeImage::systemFormat()

{

    if (QColormap::instance().depth() == 16)

        return QImage::Format_RGB16;

    return QImage::Format_RGB32;

}

#elif defined(Q_WS_X11) && !defined(QT_NO_MITSHM)

QNativeImage::QNativeImage(int width, int height, QImage::Format format,bool /* isTextBuffer */, QWidget *widget)

    : xshmimg(0), xshmpm(0)

{

    if (!X11->use_mitshm) {

        image = QImage(width, height, format);

        // follow good coding practice and set xshminfo attributes, though values not used in this case

        xshminfo.readOnly = true;

        xshminfo.shmaddr = 0;

        xshminfo.shmid = 0;

        xshminfo.shmseg = 0;

        return;

    }

    QX11Info info = widget->x11Info();

    int dd = info.depth();

    Visual *vis = (Visual*) info.visual();

    xshmimg = XShmCreateImage(X11->display, vis, dd, ZPixmap, 0, &xshminfo, width, height);

    if (!xshmimg) {

        qWarning("QNativeImage: Unable to create shared XImage.");

        return;

    }

    bool ok;

    xshminfo.shmid = shmget(IPC_PRIVATE, xshmimg->bytes_per_line * xshmimg->height,

                            IPC_CREAT | 0777);

    ok = xshminfo.shmid != -1;

    if (ok) {

        xshmimg->data = (char*)shmat(xshminfo.shmid, 0, 0);

        xshminfo.shmaddr = xshmimg->data;

        if (shmctl(xshminfo.shmid, IPC_RMID, 0) == -1)

            qWarning() << "Error while marking the shared memory segment to be destroyed";

        ok = (xshminfo.shmaddr != (char*)-1);

        if (ok)

            image = QImage((uchar *)xshmimg->data, width, height, format);

    }

    xshminfo.readOnly = false;

    if (ok)

        ok = XShmAttach(X11->display, &xshminfo);

    if (!ok) {

        qWarning() << "QNativeImage: Unable to attach to shared memory segment.";

        if (xshmimg->data) {

            free(xshmimg->data);

            xshmimg->data = 0;

        }

        XDestroyImage(xshmimg);

        xshmimg = 0;

        if (xshminfo.shmaddr)

            shmdt(xshminfo.shmaddr);

        if (xshminfo.shmid != -1)

            shmctl(xshminfo.shmid, IPC_RMID, 0);

        return;

    }

    if (X11->use_mitshm_pixmaps) {

        xshmpm = XShmCreatePixmap(X11->display, DefaultRootWindow(X11->display), xshmimg->data,

                                  &xshminfo, width, height, dd);

        if (!xshmpm) {

            qWarning() << "QNativeImage: Unable to create shared Pixmap.";

        }

    }

}

QNativeImage::~QNativeImage()

{

    if (!xshmimg)

        return;

    if (xshmpm) {

        XFreePixmap(X11->display, xshmpm);

        xshmpm = 0;

    }

    XShmDetach(X11->display, &xshminfo);

    xshmimg->data = 0;

    XDestroyImage(xshmimg);

    xshmimg = 0;

    shmdt(xshminfo.shmaddr);

    shmctl(xshminfo.shmid, IPC_RMID, 0);

}

QImage::Format QNativeImage::systemFormat()

{

    if (QX11Info::appDepth() == 16)

        return QImage::Format_RGB16;

    return QImage::Format_RGB32;

}

#elif defined(Q_WS_MAC)

QNativeImage::QNativeImage(int width, int height, QImage::Format format, bool /* isTextBuffer */, QWidget *widget)

    : image(width, height, format)

{

    uint cgflags = kCGImageAlphaNoneSkipFirst;

#ifdef kCGBitmapByteOrder32Host //only needed because CGImage.h added symbols in the minor version

    cgflags |= kCGBitmapByteOrder32Host;

#endif

    cg = CGBitmapContextCreate(image.bits(), width, height, 8, image.bytesPerLine(),

                               QCoreGraphicsPaintEngine::macDisplayColorSpace(widget), cgflags);

    CGContextTranslateCTM(cg, 0, height);

    CGContextScaleCTM(cg, 1, -1);

    Q_ASSERT(image.paintEngine()->type() == QPaintEngine::Raster);

    static_cast<QRasterPaintEngine *>(image.paintEngine())->setCGContext(cg);

}

QNativeImage::~QNativeImage()

{

    CGContextRelease(cg);

}

QImage::Format QNativeImage::systemFormat()

{

    return QImage::Format_RGB32;

}

#else // other platforms...

QNativeImage::QNativeImage(int width, int height, QImage::Format format,  bool /* isTextBuffer */, QWidget *)

    : image(width, height, format)

{

}

QNativeImage::~QNativeImage()

{

}

QImage::Format QNativeImage::systemFormat()

{

    return QImage::Format_RGB32;

}

#endif // platforms

QT_END_NAMESPACE