BitBlt - I'll get this bastard solved one day...

[rjlohan]

I am having a **** of a time trying to use BitBlt.

I understadn all the concepts of masking etc. but I am repeatedly having a problem where I put a new 'tile' over the old picture, the colours of the picture layers combine, where all I want is one to write over the other.

I have a front picture box (white bg), a buffer picbox (black bg)
The tiles I have tried drawing with black bg and white, and with a mask with black and white in alternating areas.

First I paint the mask onto the back picbox, using vbSrcPaint
Then I paint the sprite tile onto the back picbox with vbSrcAnd
And finally, I vbSrcCopy the whole thing to the front picBox.

No matter what combo I try, I can't seem to get this right...

[Sastraxi]

Black Foreground White Background masks use SrcAnd, black background sprites use SrcPaint.

[rjlohan]

I've discovered the source of my problem finally. It had nothing to do with the b/w order. I have it reversed - white background on sprites, black on masks, and that works now.

The problem I had was arising from the fact that I split my sprite and mask into 2 separate .bmps. When I combined them again, it seemed to work.

Why would that be happening? I thought BitBlt just did a pixel/bit transfer from one place to another, either as a direct copy or as a transformation, depending on the RasterOp.




It works though, and that's what counts.

[Sastraxi]

Too true =)

[rjlohan]

SOLVED!!!

Just call me a ****in idiot.

I had my BitBlt calls set slightly wrong. The mask wasn't getting painted, as I still had the SourceX set to Tile.Width or some such stupidity.

God damn.

I hate silly **** like that, but it feels good to finally have this ***** working...

[Arbiter]

I normally find then when I can't get something to work - it isn't cos I don't understand the problem or the solution, just that I've made an INCREDIBLY stupid error - like blitting to the wrong place, or with the wrong image, or some such rubbish.

Glad you solved it!