Hi all,
I have been working on the issue in handling the transparency
of the bmp images in device for a long time. Someone please guide us in
resolving this issue. I have created an offscreen window to cut a small
portion of the bmp and display in the active window at the specified
location. The bmp looses its transperancy when using CreateBitmapWindow.
But in my application i need to use Off screen window to cut out a small
portion and need to display it at a specified location.
When i tried with CreateBitmapWndow , i passed awindow handle to this
CreateBitmapWindow and passed it to another window handle and used
WinCopyRectangle to draw the image. By doing so i get the necessary
transperancy.
Why this is not happening in offscreen window..
void test()
{
UInt16 error;
Coord bitmapWidth, bitmapHeight;
UInt16 bitmapRowBytes;
UInt32 transparentValueP2 ;
//Get a pointer to the bitmap
MemHandle bitmapHnd = DmGetResource(bitmapRsc,1006);
ErrFatalDisplayIf(!bitmapHnd, "Could Not Get Bitmap Resource");
BitmapType* bitmapP = (BitmapType*) MemHandleLock(bitmapHnd);
//BmpGlueGetDimensions (bitmapP, &bitmapWidth,
&bitmapHeight,&bitmapRowBytes);
WinHandle tempW;
tempW = WinCreateOffscreenWindow(31,8, screenFormat, &error);
//tempW = WinCreateBitmapWindow(bitmapP, &error);
WinHandle screenH = WinSetDrawWindow(tempW);
//WinDrawBitmap(bitmapP, 0, -24);
WinDrawBitmap(bitmapP, 0, -24);
WinSetDrawWindow(screenH);
MemHandleUnlock(bitmapHnd);
DmReleaseResource(bitmapHnd);
//BmpGlueSetTransparentValue( NULL,transparentValueP2);
//BmpSetTransparentValue (bitmapP,&transparentColor2);
RectangleType bounds;
//if you do not already have it, get the handle to the screen
//WinHandle screenH = WinGetDrawWindow();
WinGetBounds(tempW, &bounds);
//given that drawToX, and drawToY are the top left coords of
//where you want to draw to...
//Also, you can substitute other copy modes for winPaint
WinCopyRectangle(tempW, screenH, &bounds,65, 144, winOverlay);
WinDeleteWindow(tempW, false);
SysTaskDelay(10);
}
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