The screen can only be in one bit depth at a time, so you would never set
multiple depths at once. It is either in 4, 2 or 1 (or 8 on the IIIc) bit
per pixel mode, not all three.
It's hard to say exactly why your screen went blank. You were trying to draw
a large bitmap (4-bit mode = 120x160/2 = 9,600 bytes) into a small screen
buffer (1-bit mode = 120x160/8 = 2,400 bytes) so maybe some of your dynamic
heap got overwritten.
Trevor
----------
From: Shay [SMTP:[EMAIL PROTECTED]]
Sent: Thursday, September 14, 2000 2:21 PM
To: Palm Developer Forum
Subject: Re: 4 bit error on palm v
ok, now it's clear...
and if i want to SET 1+2+4 bits depths, can i just put 0x04 or do i
need to
specify in some way the all three of them ?
still - any clue WHY my screen went blank (all the form object
disappear)
when i did "WinDrawBitmap" and just the bitmap was shown ?
shay
"Trevor Meyer" <[EMAIL PROTECTED]> wrote in message
news:24132@palm-dev-forum...
>
> The value that is returned is a bitmap indicating all the
supported
depths.
> The value you pass in to set a given mode is the number of
bits/pixel. So
> 0x08 indicates that 4-bit mode is supported, while 0x04 is used to
SET
> 4-bit/pixel mode.
>
> I agree that this is not especially intuitive.
>
> Trevor Meyer
> TRG Products
> [EMAIL PROTECTED]
>
> ----------
> From: Shay [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, September 14, 2000 1:28 PM
> To: Palm Developer Forum
> Subject: Re: 4 bit error on palm v
>
> according to the reference PDF of the palm -
> ScrDisplayMode - This function indicates support for 4-bit drawing
> by
> returning a
> value of 0x08, Support for bit depths of 2 and 1 is indicated by a
> return
> value of
> 0x03.
>
> so for some reason, when i type 4 (or 0x04) it's ok, but when i
type
> 0x08
> it's not.
> and i need support for 1,2 and 4 bits.
> and when i draw my bitmap, the rest of the screen goes blank.
> any idea ?
>
> i'm creating the bitmap myself.
>
> shay
>
>
> /forums/
>
>
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