QImage internal error

[GiuseppeBonfa]

Hi,

I'm coding a processviewer in windows, and due the necessity to convert HICON to Pixmap I've used a function of Qt sources, convertHIconToPixmap the problem is that application crashes, by debugging I've discovered that a QImage img presents a problem,

img <internal error> from Debugger Prompt

here the function

QPixmap ProcessView::ConvertHTP(const HICON icon) const
{
    bool foundAlpha = false;
    HDC screenDevice = qt_win_display_dc();
    HDC hdc = CreateCompatibleDC(screenDevice);
 
 
    ICONINFO iconinfo;
    GetIconInfo(icon, &iconinfo); //x and y Hotspot describes the icon center
 
    BITMAPINFOHEADER bitmapInfo;
    bitmapInfo.biSize        = sizeof(BITMAPINFOHEADER);
    bitmapInfo.biWidth       = iconinfo.xHotspot * 2;
    bitmapInfo.biHeight      = iconinfo.yHotspot * 2;
    bitmapInfo.biPlanes      = 1;
    bitmapInfo.biBitCount    = 32;
    bitmapInfo.biCompression = BI_RGB;
    bitmapInfo.biSizeImage   = 0;
    bitmapInfo.biXPelsPerMeter = 0;
    bitmapInfo.biYPelsPerMeter = 0;
    bitmapInfo.biClrUsed       = 0;
    bitmapInfo.biClrImportant  = 0;
    DWORD* bits;
 
    HBITMAP winBitmap = CreateDIBSection(hdc, (BITMAPINFO*)&bitmapInfo, DIB_RGB_COLORS, (VOID**)&bits, NULL, 0);
    HGDIOBJ oldhdc = (HBITMAP)SelectObject(hdc, winBitmap);
    DrawIconEx( hdc, 0, 0, icon, iconinfo.xHotspot * 2, iconinfo.yHotspot * 2, 0, 0, DI_NORMAL);
 
    QPixmap::HBitmapFormat alphaType = QPixmap::PremultipliedAlpha;
    QPixmap iconpixmap = QPixmap::fromWinHBITMAP(winBitmap, alphaType);
    [B]QImage img = iconpixmap.toImage();[/B]  // PROBLEM HERE
 
    for (int y = 0 ; y < iconpixmap.height() && !foundAlpha ; y++) {
        QRgb *scanLine= reinterpret_cast<QRgb *>(img.scanLine(y));
        for (int x = 0; x < img.width() ; x++) {
            if (qAlpha(scanLine[x]) != 0) {
                foundAlpha = true;
                break;
            }
        }
    }
 
    if (!foundAlpha) {
        //If no alpha was found, we use the mask to set alpha values
        DrawIconEx( hdc, 0, 0, icon, iconinfo.xHotspot * 2, iconinfo.yHotspot * 2, 0, 0, DI_MASK);
        QPixmap maskPixmap = QPixmap::fromWinHBITMAP(winBitmap, alphaType);
        QImage mask = maskPixmap.toImage();
 
        for (int y = 0 ; y< iconpixmap.height() ; y++){
            QRgb *scanlineImage = reinterpret_cast<QRgb *>(img.scanLine(y));
            QRgb *scanlineMask = reinterpret_cast<QRgb *>(mask.scanLine(y));
            for (int x = 0; x < img.width() ; x++){
                if (qRed(scanlineMask[x]) != 0)
                    scanlineImage[x] = 0; //mask out this pixel
                else
                    scanlineImage[x] |= 0xff000000; // set the alpha channel to 255
            }
        }
    }
 
    //dispose resources created by iconinfo call
    DeleteObject(iconinfo.hbmMask);
    DeleteObject(iconinfo.hbmColor);
 
    SelectObject(hdc, oldhdc); //restore state
    DeleteObject(winBitmap);
    DeleteDC(hdc);
    return QPixmap::fromImage(img);
}

QPixmap ProcessView::ConvertHTP(const HICON icon) const
{
    bool foundAlpha = false;
    HDC screenDevice = qt_win_display_dc();
    HDC hdc = CreateCompatibleDC(screenDevice);


    ICONINFO iconinfo;
    GetIconInfo(icon, &iconinfo); //x and y Hotspot describes the icon center

    BITMAPINFOHEADER bitmapInfo;
    bitmapInfo.biSize        = sizeof(BITMAPINFOHEADER);
    bitmapInfo.biWidth       = iconinfo.xHotspot * 2;
    bitmapInfo.biHeight      = iconinfo.yHotspot * 2;
    bitmapInfo.biPlanes      = 1;
    bitmapInfo.biBitCount    = 32;
    bitmapInfo.biCompression = BI_RGB;
    bitmapInfo.biSizeImage   = 0;
    bitmapInfo.biXPelsPerMeter = 0;
    bitmapInfo.biYPelsPerMeter = 0;
    bitmapInfo.biClrUsed       = 0;
    bitmapInfo.biClrImportant  = 0;
    DWORD* bits;

    HBITMAP winBitmap = CreateDIBSection(hdc, (BITMAPINFO*)&bitmapInfo, DIB_RGB_COLORS, (VOID**)&bits, NULL, 0);
    HGDIOBJ oldhdc = (HBITMAP)SelectObject(hdc, winBitmap);
    DrawIconEx( hdc, 0, 0, icon, iconinfo.xHotspot * 2, iconinfo.yHotspot * 2, 0, 0, DI_NORMAL);

    QPixmap::HBitmapFormat alphaType = QPixmap::PremultipliedAlpha;
    QPixmap iconpixmap = QPixmap::fromWinHBITMAP(winBitmap, alphaType);
    [B]QImage img = iconpixmap.toImage();[/B]  // PROBLEM HERE

    for (int y = 0 ; y < iconpixmap.height() && !foundAlpha ; y++) {
        QRgb *scanLine= reinterpret_cast<QRgb *>(img.scanLine(y));
        for (int x = 0; x < img.width() ; x++) {
            if (qAlpha(scanLine[x]) != 0) {
                foundAlpha = true;
                break;
            }
        }
    }

    if (!foundAlpha) {
        //If no alpha was found, we use the mask to set alpha values
        DrawIconEx( hdc, 0, 0, icon, iconinfo.xHotspot * 2, iconinfo.yHotspot * 2, 0, 0, DI_MASK);
        QPixmap maskPixmap = QPixmap::fromWinHBITMAP(winBitmap, alphaType);
        QImage mask = maskPixmap.toImage();

        for (int y = 0 ; y< iconpixmap.height() ; y++){
            QRgb *scanlineImage = reinterpret_cast<QRgb *>(img.scanLine(y));
            QRgb *scanlineMask = reinterpret_cast<QRgb *>(mask.scanLine(y));
            for (int x = 0; x < img.width() ; x++){
                if (qRed(scanlineMask[x]) != 0)
                    scanlineImage[x] = 0; //mask out this pixel
                else
                    scanlineImage[x] |= 0xff000000; // set the alpha channel to 255
            }
        }
    }

    //dispose resources created by iconinfo call
    DeleteObject(iconinfo.hbmMask);
    DeleteObject(iconinfo.hbmColor);

    SelectObject(hdc, oldhdc); //restore state
    DeleteObject(winBitmap);
    DeleteDC(hdc);
    return QPixmap::fromImage(img);
}

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how can be solved QImage img <internal error> ? thanks

Regards,
Giuseppe Bonfa'

[GiuseppeBonfa]

seems that every declaration of a QImage leads to this error, no solutions at the moment