Hi
I would like to know a bit more what's going on in the bitmap conversions.
Take following code excerpt:
bmpV2 = BmpCreate( width, height, 16, NULL, &error );
dataV2 = BmpGetBits( bmpV2 );
bmpV3 = (BitmapPtr) BmpCreateBitmapV3( bmpV2, kDensityDouble, dataV2,
NULL );
dataV3 = BmpGetBits( bmpV3 );
While debugging, I discovered that dataV2 == dataV3 (they both point to the
same location).
Can I assume that:
1. I don't need to free the bmpV2 bitmap (using BmpDelete), since doing so
would free the dataV2 and thus dataV3, too.
(When I deleted the bmpV2 bitmap (using BmpDelete), but I continued to
use the bmpV3 bitmap, the image data got sometimes corrupted.)
2. BmpDelete( bmpV3 ) deletes the image data correctly.
3. The bmpV2 header will be freed, either in BmpCreateBitmapV3, or
BmpDelete( bmpV3 ).
Would be great if somebody could answer that. The official documentation
does not reveal much...
Jan Slodicka
----- Original Message -----
From: "Aaron Ardiri" <[EMAIL PROTECTED]>
>
> this is what we do in lemmings for example:
>
> ---
> if (DeviceSupportsVersion(romVersion3_5))
> {
> globals.drawBitmap =
> BmpCreate(WIDTH, HEIGHT, globals.scrDepth, NULL, &err);
> if (err == errNone)
> {
> // high density device
> if (globals.palmHD.device)
> {
> globals.drawBitmapV3 =
> BmpCreateBitmapV3(globals.drawBitmap,
> globals.palmHD.density,
> BmpGetBits(globals.drawBitmap), NULL);
> err = (globals.drawBitmapV3 == NULL);
> if (err == errNone)
> globals.drawWindow =
> WinCreateBitmapWindow((BitmapType *)globals.drawBitmapV3,
&err);
> }
> else
> globals.drawWindow =
> WinCreateBitmapWindow(globals.drawBitmap, &err);
> }
> }
> else
> globals.drawWindow =
> WinCreateOffscreenWindow(WIDTH, HEIGHT, screenFormat, &err);
> err |= (Boolean)(globals.drawWindow == NULL);
>
> ---
>
> that will give you a window. which, you can then copy using
> WinCopyRectangle() i know this technique works on *ALL* devices,
> including 68k palm, sony hires, handera and the palm hires devices.
>
> ---
> Aaron Ardiri [EMAIL PROTECTED]
> CEO - CTO +46 70 656 1143
> Mobile Wizardry http://www.mobilewizardry.com/
>
>
> --
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