Problems with IGraphics->Flood()

I've got a problem with a function from graphics.library called Flood() which fills the given area with specified color or pattern.

I allocate all the neccessary data for RastPort - the AreaInfo and TmpRas:

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The procedure gives incorrect results ie. the flooding is not performed or performed inappropriately. Anybody knows how to handle this function correctly? Thanks in advance.

@RNS-AMiGA-Club

What does the destination bitmap/rastport contain?

Did you read the desctiption of Flood? It works differently than usual fill functions in paint programs for example.


Edit: your TmpRas ist not initialized correctly. The size should be RASSIZE(256,256), not 256*256. We are talking about a single bitplane, not a chunky bitmap.

Hey, after some tests it turned out that the Flood() procedure in its current form works only on planar bitmaps.

@thomas

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It contains bitmap allocated via AllocBitMap(), the RastPort is initialized by InitRastPort() and then the bitmap is attached to it.

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Yes, I did. When the 2nd argument equals to 1 it should act exactly like it is in paint programs.

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Thanks, yes, the RASSIZE(256, 256) gives the correct size of one bitplane. I was a bit confused whether this data should be in chunky or planar.

So it turned out that the Flood() in its current form works properly only on up-to 8 bit planar bitmaps. Chunky bitmaps aren't supported. I tested it with good results on AmigaOS3.5 and AmigaOS4.1.

Worth noticing is the fact that other areafill functions like AreaEllipse work correctly on any bitmap.

To allocate planar bitmap you need to provide NULL argument in the FriendBitMap field. So with bitmaps allocated with:

IGraphics->AllocBitMap( WIDTH, HEIGHT, DEPTH, BMF_CLEAR, NULL)

where 1 <= DEPTH <= 8 the Flood() procedure will work correctly, but with bitmaps allocated via:

IGraphics->AllocBitMap( WIDTH, HEIGHT, DEPTH, BMF_CLEAR, friendbm);

the Flood() procedure won't work correctly.

I need to use the Flood() on 24-bit chunky bitmaps so I probably will need to create my own 24-bit Flood() function. It should not be that hard to accomplish I hope.

That non-working Flood() have been problem to me as well. Then I decided to just forget it.

@RNS-AMiGA-Club

I successfully tried Flood() on OS 3.9 directly into the window and the bitmap is 32 bit, so it does work correctly. I will try it with an off-screen bitmap later.

@TSK

I need a substitute to Flood() function for my 32-bit icon editor. I'll probably use the Picasso96API.library bitmap rendering functions which works on >8 bit deep bitmaps.

@thomas

So it may be an OS4.x problem.

@RNS-AMiGA-Club

PerfectPaint demonstrates this. No flood-tool for deep graphics. (I got to remember that, start work in 8-bit.)