That was my question a couple of days ago. Nobody answered. Not only bitmaps are corrupted - text, lines, rectangles, everything. The funny part is that some things does not get corrupted, some does... I dunno why. I'm allocating large screens and they MUST be 1-bit. This is some OS5 bug, on older devices even on Tungsten/W with high-res and 16bit this does not show. The bug is in OS5.0, 5.1.2, 5.2 and 5.3. Dunno how to report this to Palm but it's important to be fixed... if anybody pay attention to this problem
"Tom Cain" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > > Oops, sorry about that. My newsreader got away from me before I was > finished. :) Here is the code: > > -- PILRC SAMPLE -- > > BITMAPFAMILYEX ID BMF_TestBitmap > BEGIN > BITMAP "bmp1_Test.bmp" BPP 1 DENSITY 1 > BITMAP "bmp1dd_Test.bmp" BPP 1 DENSITY 2 > END > > -- CODE SAMPLE -- > > MemHandle resH; > BitmapType *resP; > BitmapType *bmpP; > BitmapTypeV3 *bmpV3; > Err error; > WinHandle winH; > RectangleType rect; > > // Create a 1-bit high-density bitmap and offscreen window. > bmpP = BmpCreate(40, 40, 1, NULL, &error); > bmpV3 = BmpCreateBitmapV3(bmpP, kDensityDouble, BmpGetBits(bmpP), NULL); > winH = WinCreateBitmapWindow((BitmapType*)bmpV3, &error); > > // Draw a resource bitmap onto the new offscreen window. > WinSetDrawWindow(winH); > resH = DmGetResource(bitmapRsc, BMF_TestBitmap); > resP = MemHandleLock(resH); > WinDrawBitmap(resP, 0, 0); > MemPtrUnlock(resP); > DmReleaseResource(resH); > > // Draw a diagonal line across the offscreen window. > WinDrawLine(0, 0, 20, 20); > > // Copy the offscreen window to the screen. > RctSetRectangle(&rect, 0, 0, 20, 20); > WinCopyRectangle(winH, WinGetDisplayWindow(), &rect, 0, 0, winPaint); > > // Delete the offscreen window and bitmaps. > WinDeleteWindow(winH, false); > BmpDelete(bmpP); > BmpDelete((BitmapType*)bmpV3); > > -- END CODE SAMPLE -- > > > What I get with this sample is a corrupted image from the WinDrawBitmap > code. I put the code to draw the diagonal line on the offscreen window to > check if there was a problem with the WinCopyRectangle from the offscreen > window to the screen, but the diagonal line displays perfectly over the > corrupted bitmap image as expected. > > My understanding is that you should be able to create an offscreen window in > this manner and draw to it from a resource bitmap. In fact, this code works > without trouble if the bitmap used to create the window is created as 8-bit > or 16-bit. It works as is if you put the Palm Simulator in 1-bit display > mode, and it works if you create the V3 bitmap as kDensityLow. Also, with > 8-bit and 16-bit resource bitmaps on 16-bit high-density offscreen windows, > this method works fine. But creating a 1-bit high-density offscreen window > and then drawing a 1-bit resource bitmap to it doesn't seem to work for me. > > I'm sure I'm staring right at the answer, but after hours of looking through > the docs and my code, I just can't see it. :) Does anyone have any ideas > about what I'm doing wrong here? > > -Tom Cain > > > > -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
