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  1. Qt
  2. QTBUG-11463

Windows: QClipboard failed to set QImage with transparency

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Details

    • Bug
    • Resolution: Won't Do
    • P2: Important
    • 5.4.0
    • 4.6.3, 5.3.0, 5.3.1
    • QPA: Windows
    • Windows 7 Enterprise, 32bit, English
    • 9150563940f61be9fb17510be49c0734244866a5 (dev, 4.7.2014)

    Description

      Steps:
      1. Create a QImage object with transparency.
      2. QClipboard::setImage to set clipboard, save teh QImage to a PNG file also.
      3. Paste the clibpard to word or other applications.
      Note: the transparent pixels were filed with black.
      This looks like a regression on 4.6.3. (I didn't find it on 4.6.2)

      Please use the code below to recreate this defect:

      #include <QtCore>
#include <QApplication>
#include <QClipboard>
#include <QPainter>
#include <QImage>

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QImage img( 100, 100, QImage::Format_ARGB32_Premultiplied );
    img.fill( QColor(Qt::transparent).rgba() );
    
    {
        QPainter painter( &img );
        painter.setBrush( Qt::blue );
        painter.drawPie( 20, 20, 50, 50, 45 * 16, 135 * 16 );
    }

    QApplication::clipboard()->setImage( img );
    img.save( "C:/test.png" );

    return 0;
}

      Attachments

        1. white_bg.png
          white_bg.png
          43 kB
        2. qtbug11463.zip
          3 kB

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-57410 Copying image to clipboard removes alpha channel

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-64322 [Windows] Cannot drag and drop PNG images to PowerPoint

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-45265 Windows: Copying QImage of QImage::Format_ARGB32 into QClipboard results in corrupted image

          • P4: Low - Would be nice to fix, but it's not very important.
          • Closed
          resulted in

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-47656 [Reg 5.3->5.4] QClipboard fails to create DIB from image with transparency

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          For Gerrit Dashboard: QTBUG-11463
          # Subject Branch Project Status CR V
          88803,6 Windows clipboard: Deny CF_DIB support for images with alpha. dev qt/qtbase Status: MERGED +2 0
          124045,2 QWindowsMimeImage: Revert image format handling back to Qt 4. 5.5 qt/qtbase Status: MERGED +2 0

          Activity

            People

              kleint Friedemann Kleint
              aladdina Mason Chang
              Votes:
              3 Vote for this issue
              Watchers:
              8 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

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