Introduce Symbian CFbsBitmap <-> QPixmap conversion functions.

Introduce functions for converting to and from a CFbsBitmap on Symbian.
Currently these functions unfortunately have to copy the data to the
internal QImage stored in the raster pixmap data backend :( Hopefully
we can improve this with a native Symbian pixmap backend in the future.

The autotest generates both small and large CFbsBitmaps of different
formats and then verifies that the color makes it into the QPixmap.
Currently the indexed image formats don't seem to work, but this is
most likely because we don't set a palette for them. The semi-trans
bitmaps seem to work fine (verified visually), but the current QCOMPARE
doesn't consider the fact that the color was alpha blended.

Reviewed-by: Sami Merilä

2 files changed, 143 insertions, 6 deletions

diff --git a/src/gui/image/qpixmap.h b/src/gui/image/qpixmap.h
index 1863273..9ef5347 100644
--- a/src/gui/image/qpixmap.h
+++ b/src/gui/image/qpixmap.h
@@ -62,6 +62,10 @@ class QX11Info;
 
 class QPixmapData;
 
+#if defined(Q_OS_SYMBIAN)
+class CFbsBitmap;
+#endif
+
 class Q_GUI_EXPORT QPixmap : public QPaintDevice
 {
 public:
@@ -152,6 +156,11 @@ public:
     static QPixmap fromMacCGImageRef(CGImageRef image);
 #endif
 
+#if defined(Q_OS_SYMBIAN)
+    CFbsBitmap *toSymbianCFbsBitmap() const;
+    static QPixmap fromSymbianCFbsBitmap(CFbsBitmap *bitmap);
+#endif
+
     inline QPixmap copy(int x, int y, int width, int height) const;
     QPixmap copy(const QRect &rect = QRect()) const;
 
diff --git a/src/gui/image/qpixmap_s60.cpp b/src/gui/image/qpixmap_s60.cpp
index 52e2fe7..879c980 100644
--- a/src/gui/image/qpixmap_s60.cpp
+++ b/src/gui/image/qpixmap_s60.cpp
@@ -91,14 +91,142 @@ QPixmap QPixmap::grabWindow(WId winId, int x, int y, int w, int h )
         return QPixmap();
     }
 
-    QImage::Format format = qt_TDisplayMode2Format( displayMode );
-    int bytesPerLine = CFbsBitmap::ScanLineLength(temporary->SizeInPixels().iWidth,displayMode);
-    temporary->LockHeap();
-    QImage image = QImage((uchar*)temporary->DataAddress(), srcRect.Width(), srcRect.Height(), bytesPerLine, format);
-    QPixmap pixmap = QPixmap::fromImage(image.copy());
-    temporary->UnlockHeap();
+    QPixmap pixmap = QPixmap::fromSymbianCFbsBitmap(temporary);
     CBase::Delete(temporary);
     return pixmap;
+}
+
+/*!
+\since 4.6
+
+Returns a \c CFbsBitmap that is equivalent to the QPixmap by copying the data.
+
+It is the caller's responsibility to delete the \c CFbsBitmap after use.
+
+\warning This function is only available on Symbian OS.
+
+\sa fromSymbianCFbsBitmap()
+*/
+
+CFbsBitmap *QPixmap::toSymbianCFbsBitmap() const
+{
+    if (isNull())
+        return 0;
+
+    TDisplayMode mode;
+    const QImage img = toImage();
+    QImage::Format destFormat = img.format();
+    switch (img.format()) {
+    case QImage::Format_Mono:
+        destFormat = QImage::Format_MonoLSB;
+        // Fall through intended
+    case QImage::Format_MonoLSB:
+        mode = EGray2;
+        break;
+    case QImage::Format_Indexed8:
+        if (img.isGrayscale())
+            mode = EGray256;
+        else
+            mode = EColor256;
+        break;
+    case QImage::Format_RGB32:
+        mode = EColor16MU;
+        break;
+    case QImage::Format_ARGB6666_Premultiplied:
+    case QImage::Format_ARGB8565_Premultiplied:
+    case QImage::Format_ARGB8555_Premultiplied:
+        destFormat = QImage::Format_ARGB32_Premultiplied;
+        // Fall through intended
+    case QImage::Format_ARGB32_Premultiplied:
+#if !defined(__SERIES60_31__) && !defined(__S60_32__)
+        // ### TODO: Add runtime detection as well?
+        mode = EColor16MAP:
+            break;
+#endif
+        destFormat = QImage::Format_ARGB32;
+        // Fall through intended
+    case QImage::Format_ARGB32:
+        mode = EColor16MA;
+        break;
+    case QImage::Format_RGB555:
+        destFormat = QImage::Format_RGB16;
+        // Fall through intended
+    case QImage::Format_RGB16:
+        mode = EColor64K;
+        break;
+    case QImage::Format_RGB666:
+        destFormat = QImage::Format_RGB888;
+        // Fall through intended
+    case QImage::Format_RGB888:
+        mode = EColor16M;
+        break;
+    case QImage::Format_RGB444:
+        mode = EColor4K;
+        break;
+    case QImage::Format_Invalid:
+        return 0;
+    default:
+        qWarning("Image format not supported: %d", img.format());
+        return 0;
+    }
+
+    CFbsBitmap* bitmap = new (ELeave) CFbsBitmap();
+    TSize size(width(), height());
+    if (bitmap->Create(size, mode) != KErrNone) {
+        CBase::Delete(bitmap);
+        return 0;
+    }
+
+    const QImage converted = img.convertToFormat(destFormat);
 
+    bitmap->LockHeap();
+    const uchar *sptr = converted.bits();
+    uchar *dptr = (uchar*)bitmap->DataAddress();
+    Mem::Copy(dptr, sptr, converted.numBytes());
+    bitmap->UnlockHeap();
+    return bitmap;
 }
+
+/*!
+\since 4.6
+
+Returns a QPixmap that is equivalent to the \c CFbsBitmap by copying the data.
+If the CFbsBitmap is not valid or is compressed in memory, this function will
+return a null QPixmap.
+
+\warning This function is only available on Symbian OS.
+
+\sa toSymbianCFbsBitmap(), {QPixmap#Pixmap Conversion}{Pixmap Conversion}
+*/
+
+QPixmap QPixmap::fromSymbianCFbsBitmap(CFbsBitmap *bitmap)
+{
+    int width = bitmap->SizeInPixels().iWidth;
+    int height = bitmap->SizeInPixels().iHeight;
+
+    if (!bitmap || width <= 0 || height <= 0 || bitmap->IsCompressedInRAM())
+        return QPixmap();
+
+    TDisplayMode displayMode = bitmap->DisplayMode();
+    QImage::Format format = qt_TDisplayMode2Format(displayMode);
+    int bytesPerLine = CFbsBitmap::ScanLineLength(width, displayMode);
+    bitmap->LockHeap();
+    QImage image = QImage((const uchar*)bitmap->DataAddress(), width, height, bytesPerLine, format);
+    if (displayMode == EGray2) {
+        image.setNumColors(2);
+        image.setColor(0, QColor(Qt::color0).rgba());
+        image.setColor(1, QColor(Qt::color1).rgba());
+    } else if (displayMode == EGray256) {
+        for (int i=0; i < 256; ++i)
+            image.setColor(i, qRgb(i, i, i));
+    }else if (displayMode == EColor256) {
+        const TColor256Util *palette = TColor256Util::Default();
+        for (int i=0; i < 256; ++i)
+            image.setColor(i, (QRgb)(palette->Color256(i).Value()));
+    }
+    QPixmap pixmap = QPixmap::fromImage(image.copy());
+    bitmap->UnlockHeap();
+    return pixmap;
+}
+
 QT_END_NAMESPACE