I've attached example code that shows the problem.
Put this into Starter.c in a new CW stationary program and
call DrawBullet() in the Event handler. Fails on 3.5 en-ez and en-nonenz
ROMs
Works on en-color ROM. Seems like I must have missed some doc about
proper handling of bitmap/color depth issues.
-- Chuck
---------------------------------------------------------------
static
BitmapType* createBitmap(UInt16 height, UInt16 width,
UInt8 depth, UInt8 rowBytes,
void* data)
{
BitmapType* bitmap = NULL;
// First, determine the size of the data.
UInt32 image_byte_count = height * rowBytes;
UInt32 bitmap_datalen = bitmap_datalen = sizeof(BitmapType) +
image_byte_count;
void* image_data = NULL;
// Second, allocate space
bitmap = (BitmapType*) MemPtrNew(bitmap_datalen);
MemSet(bitmap, bitmap_datalen, 0);
// Third, fill in the header
bitmap->width = width;
bitmap->height = height;
bitmap->rowBytes = rowBytes;
file://bitmap->flags = 0; // leave empty
bitmap->pixelSize = depth;
bitmap->version = 2;
bitmap->nextDepthOffset = 0; // only one bitmap, not a family
bitmap->transparentIndex = 0;
bitmap->compressionType = BitmapCompressionTypeNone;
bitmap->reserved = 0; // leave empty
// Finally, copy the image data
image_data = BmpGetBits(bitmap);
MemMove(image_data, data, image_byte_count);
return bitmap;
}
static const UInt8 Bullet[] = {
0xff, 0xff, 0xe7, 0xc3, 0xc3, 0xe7, 0xff, 0xff };
void DrawBullet(UInt16 x, UInt16 y)
{
BitmapType *pBitmap;
pBitmap = createBitmap(8,8,1,1, (void*)Bullet);
WinSetDrawWindow(WinGetDisplayWindow());
WinPushDrawState();
WinSetForeColor(UIColorGetTableEntryIndex(UIFieldBackground));
WinSetBackColor(UIColorGetTableEntryIndex(UIObjectForeground));
WinDrawBitmap(pBitmap, x, y);
WinPopDrawState();
}
----------------------------------------------------------------------------
------
"Chuck Ingold" <[EMAIL PROTECTED]> wrote in message
news:63451@palm-dev-forum...
>
> Hi all,
>
> I have a problem similar to the Capturing Signatures thread, namely trying
> to allocate and initialize a BitmapType for display by WinDrawBitmap().
> I have a network app which has received the bitmap data. The conversion
> function seems to be fine running on the 3.5 en-color ROM, but when I run
it
> on the 3.5 en-ez ROM, I get an error accessing a multibyte value at an odd
> address. The troublesome address is N+1 where N is the address of the
image
> data.
>
> What I want to know is what is different between the ROMs, and how am I
> supposed to handle it?
> My attempts to search for this information produce either Constructor docs
> or the pre-3.5 code for the Singature sample. Is the unsupported part of
> Signature getting the bits from the screen or using the bits in a bitmap
by
> copying them to the location after the [BitmapType + optional ColorTable]?
>
> Thanks,
>
> Chuck
>
>
>
>
--
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