How to draw a bitmap on another bitmap?

Hein Gustavsen

Delphi Developer

Fri, 12 Feb 1999 03:00:00 GMT

How to draw a bitmap on another bitmap?

Hello!

I have a background bitmap (BkBitmap), and I want to put a transparent
bitmap (FgBitmap) with some lines on top of the other bitmap. FgBitmap
will change often, and I don't want any of them to flicker when
redrawing.

Does anyone have a good advice for me? Please send email.

Hein Gustavsen
he...@studpors.hit.no

Mark Pritchar

Delphi Developer

Sat, 13 Feb 1999 03:00:00 GMT

Re:How to draw a bitmap on another bitmap?

Quote

Hein Gustavsen wrote:

> Hello!

> I have a background bitmap (BkBitmap), and I want to put a transparent
> bitmap (FgBitmap) with some lines on top of the other bitmap. FgBitmap
> will change often, and I don't want any of them to flicker when
> redrawing.

> Does anyone have a good advice for me? Please send email.

Create another bitmap, off the screen. Do all your drawing operations
onto it, and then blit the whole lot onto BkBitmap in one hit.

--
Mark.

Dominic Gruetzmache

Delphi Developer

Mon, 15 Feb 1999 03:00:00 GMT

Re:How to draw a bitmap on another bitmap?

Mark is right. This would probably be the best technique to use in this
case. You can e-mail me if you would like more info or a code sample.

Dominic

Quote

Mark Pritchard wrote:

> Hein Gustavsen wrote:

> > Hello!

> > I have a background bitmap (BkBitmap), and I want to put a transparent
> > bitmap (FgBitmap) with some lines on top of the other bitmap. FgBitmap
> > will change often, and I don't want any of them to flicker when
> > redrawing.

> > Does anyone have a good advice for me? Please send email.

> Create another bitmap, off the screen. Do all your drawing operations
> onto it, and then blit the whole lot onto BkBitmap in one hit.

> --
> Mark.

Dominic Gruetzmache

Delphi Developer

Mon, 15 Feb 1999 03:00:00 GMT

Re:How to draw a bitmap on another bitmap?

Mark is right. This would probably be the best techniqu to use in
this case. You can e-mail me if you would like more info or a
code sample.

Dominic

Quote

Mark Pritchard wrote:

> Hein Gustavsen wrote:

> > Hello!

> > I have a background bitmap (BkBitmap), and I want to put a transparent
> > bitmap (FgBitmap) with some lines on top of the other bitmap. FgBitmap
> > will change often, and I don't want any of them to flicker when
> > redrawing.

> > Does anyone have a good advice for me? Please send email.

> Create another bitmap, off the screen. Do all your drawing operations
> onto it, and then blit the whole lot onto BkBitmap in one hit.

> --
> Mark.

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