_LVOOpenScreen() Bitmap

redblade · 02 October 2006, 02:16

Hi

I open a screen with a depth of 1, and I want to load a 320x256x1bitplane bitmap to it.

Does the bitmap in the Screen Structure point to the Bitmap or does it point to a bitmap structure?

thanks.

ganralf · 02 October 2006, 19:03

Screen->BitMap is an embedded BitMap structure and not a pointer. For that reason this BitMap structure is not allowed to grow and one should access Screen->RastPort->BitMap (which is a pointer to the screen's BitMap structure).

Anyway for your purpose you should allocate a BitMap before opening the screen and supply that structure to OpenScreen():

myBitMap=AllocBitMap(320,256,1,BMF_DISPLAYABLE,NULL);
Load you graphic to myBitMap->Planes[0];
myScreen=OpenScreenTags(NULL, ... , SABitMap, myBitMap , ... );

This will save memory and avoid flicker.

redblade · 02 October 2006, 23:25

thanks

02 October 2006, 02:16	#1
redblade Zone Friend Join Date: Mar 2004 Location: Middle Earth Age: 40 Posts: 2,127	_LVOOpenScreen() Bitmap Hi I open a screen with a depth of 1, and I want to load a 320x256x1bitplane bitmap to it. Does the bitmap in the Screen Structure point to the Bitmap or does it point to a bitmap structure? thanks.

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02 October 2006, 19:03	#2
ganralf Registered User Join Date: May 2006 Location: Germany Posts: 97	Screen->BitMap is an embedded BitMap structure and not a pointer. For that reason this BitMap structure is not allowed to grow and one should access Screen->RastPort->BitMap (which is a pointer to the screen's BitMap structure). Anyway for your purpose you should allocate a BitMap before opening the screen and supply that structure to OpenScreen(): myBitMap=AllocBitMap(320,256,1,BMF_DISPLAYABLE,NULL); Load you graphic to myBitMap->Planes[0]; myScreen=OpenScreenTags(NULL, ... , SABitMap, myBitMap , ... ); This will save memory and avoid flicker.

02 October 2006, 23:25	#3
redblade Zone Friend Join Date: Mar 2004 Location: Middle Earth Age: 40 Posts: 2,127	thanks

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