Rescaling bitmaps

[Arcom]

Here's my question. How do you rescale bitmaps?

...and I don't mean using the PaintPicture or StretchBlt API.

e.g. I created a bitmap (used for memory DC) whose size is 320 x 240 pixels. Now how can I rescale (resize, expand...call it whatever you like) it to, for eg., 640 x 480 pixels?
The only solution I've come around so far is to create a new bitmap and delete the old one... but I know there has to be another way.

[Sastraxi]

If you want not to lose quality then you can go to
http://vbden.tripod.com/download.htm

Where I have made my own enhancer for gfx...
And I have a DLL version on the go (uses DDraw) that you can use at runtime...

just email me
vb.den@gmx.co.uk

[Arcom]

Actually, the bitmap is empty (created with the CreateCompatibleBitmap API).

Hm, just realized I've used the wrong word for the title :)

I need to change the bitmap's width/height. You know, exactly the same as when you change the height/width properties of a PictureBox and the "drawing area" expands...

[Sastraxi]

Then why don't you do that?

[Arcom]

The reason is simple. I can't :(

I tried using the SetBitmapDimensionEx API but the system doesn't use these dimensions when blitting onto a DC. And as for the PixtureBox, I'm trying to use as less controls as possible...

[kedaman]

Youre so right, you can't, simply because a a bitmap is a bit-map, a singledimensioned array of bits. What you have to do is create a new bitmap and blit over.

[Arcom]

I thought so...bummer...

[Sastraxi]

Whacha doin'?

[Arcom]

I'm creating a program for designing labels, covers, etc.

[Sastraxi]

In my DLL I'll have some easy-DX stuff, allowing you do change pixels on a DDraw(DX7) surface using a LONG array of x,y, instead of what DD gives you....