* QPixmap: Add toWinHICON() & fromWinHICON() method

Duplicate QPixmap <-> HICON conversion code removed from
qwidget_win.cpp & qsystemtrayicon_win.cpp.

Task-number: 218533

Merge-request: 1570
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@nokia.com>

3 files changed, 78 insertions, 4 deletions

diff --git a/src/gui/image/qpixmap.cpp b/src/gui/image/qpixmap.cpp
index 4f145af..558ae54 100644
--- a/src/gui/image/qpixmap.cpp
+++ b/src/gui/image/qpixmap.cpp
@@ -1678,12 +1678,15 @@ QPixmap QPixmap::transformed(const QMatrix &matrix, Qt::TransformationMode mode)
     operation, you can use QBitmap::fromImage() instead.
 
     In addition, on Windows, the QPixmap class supports conversion to
-    and from HBitmap: the toWinHBITMAP() function creates a HBITMAP
+    and from HBITMAP: the toWinHBITMAP() function creates a HBITMAP
     equivalent to the QPixmap, based on the given HBitmapFormat, and
     returns the HBITMAP handle. The fromWinHBITMAP() function returns
     a QPixmap that is equivalent to the given bitmap which has the
-    specified format.
-    
+    specified format. The QPixmap class also supports conversion to
+    and from HICON: the toWinHICON() function creates a HICON equivalent
+    to the QPixmap, and returns the HICON handle. The fromWinHICON()
+    function returns a QPixmap that is equivalent to the given icon.
+
     In addition, on Symbian, the QPixmap class supports conversion to
     and from CFbsBitmap: the toSymbianCFbsBitmap() function creates
     CFbsBitmap equivalent to the QPixmap, based on given mode and returns 
@@ -2040,7 +2043,7 @@ QPixmapData* QPixmap::pixmapData() const
 
     \warning This function is only available on Windows.
 
-    \sa fromWinHBITMAP()
+    \sa fromWinHBITMAP(), {QPixmap#Pixmap Conversion}{Pixmap Conversion}
 */
 
 /*! \fn QPixmap QPixmap::fromWinHBITMAP(HBITMAP bitmap, HBitmapFormat format)
@@ -2054,6 +2057,31 @@ QPixmapData* QPixmap::pixmapData() const
 
 */
 
+/*! \fn HICON QPixmap::toWinHICON() const
+    \since 4.6
+
+    \bold{Win32 only:} Creates a \c HICON equivalent to the QPixmap.
+    Returns the \c HICON handle.
+
+    It is the caller's responsibility to free the \c HICON data after use.
+
+    \warning This function is only available on Windows.
+
+    \sa fromWinHICON(), {QPixmap#Pixmap Conversion}{Pixmap Conversion}
+*/
+
+/*! \fn QPixmap QPixmap::fromWinHICON(HICON icon)
+    \since 4.6
+
+    \bold{Win32 only:} Returns a QPixmap that is equivalent to the given
+    \a icon.
+
+    \warning This function is only available on Windows.
+
+    \sa toWinHICON(), {QPixmap#Pixmap Conversion}{Pixmap Conversion}
+
+*/
+
 /*! \fn const QX11Info &QPixmap::x11Info() const
     \bold{X11 only:} Returns information about the configuration of
     the X display used to display the widget.
diff --git a/src/gui/image/qpixmap.h b/src/gui/image/qpixmap.h
index 54e89ff..2ed65ea 100644
--- a/src/gui/image/qpixmap.h
+++ b/src/gui/image/qpixmap.h
@@ -149,7 +149,10 @@ public:
     };
 
     HBITMAP toWinHBITMAP(HBitmapFormat format = NoAlpha) const;
+    HICON toWinHICON() const;
+
     static QPixmap fromWinHBITMAP(HBITMAP hbitmap, HBitmapFormat format = NoAlpha);
+    static QPixmap fromWinHICON(HICON hicon);
 #endif
 
 #if defined(Q_WS_MAC)
diff --git a/src/gui/image/qpixmap_win.cpp b/src/gui/image/qpixmap_win.cpp
index 9042840..7f0c8e3 100644
--- a/src/gui/image/qpixmap_win.cpp
+++ b/src/gui/image/qpixmap_win.cpp
@@ -236,6 +236,49 @@ QPixmap QPixmap::fromWinHBITMAP(HBITMAP bitmap, HBitmapFormat format)
     return fromImage(result);
 }
 
+HBITMAP qt_createIconMask(const QBitmap &bitmap)
+{
+    QImage bm = bitmap.toImage().convertToFormat(QImage::Format_Mono);
+    int w = bm.width();
+    int h = bm.height();
+    int bpl = ((w+15)/16)*2;                        // bpl, 16 bit alignment
+    uchar *bits = new uchar[bpl*h];
+    bm.invertPixels();
+    for (int y=0; y<h; y++)
+        memcpy(bits+y*bpl, bm.scanLine(y), bpl);
+    HBITMAP hbm = CreateBitmap(w, h, 1, 1, bits);
+    delete [] bits;
+    return hbm;
+}
+
+HICON QPixmap::toWinHICON() const
+{
+    QBitmap maskBitmap = mask();
+    if (maskBitmap.isNull()) {
+        maskBitmap= QBitmap(size());
+        maskBitmap.fill(Qt::color1);
+    }
+
+    ICONINFO ii;
+    ii.fIcon    = true;
+    ii.hbmMask  = qt_createIconMask(maskBitmap);
+    ii.hbmColor = toWinHBITMAP(QPixmap::Alpha);
+    ii.xHotspot = 0;
+    ii.yHotspot = 0;
+
+    HICON hIcon = CreateIconIndirect(&ii);
+
+    DeleteObject(ii.hbmColor);
+    DeleteObject(ii.hbmMask);
+
+    return hIcon;
+}
+
+QPixmap QPixmap::fromWinHICON(HICON icon)
+{
+	return convertHIconToPixmap(icon);
+}
+
 #ifdef Q_WS_WIN
 #ifndef Q_WS_WINCE