Re: fltk backend fix & mouse wheel scroll factor

[Shai Ayal]

On Tue, Sep 29, 2009 at 11:12 AM, Michael Goffioul
<address@hidden> wrote:
> I see 2 problems with using bitmaps:
> - they are not 3D
But images are not 3D either right?

> - you have a 1-to-1 pixel mapping between the bitmap and the screen,
>  which is not what Matlab is doing; for instance a colorbar is just a
>  c x 1 image object rendered in a m x n box (m>c, n>>1); you can do
>  that seamlessly with textures
I thought so too, but I found out this morning about glPixelZoom which
will scale the bitmap:
http://www.opengl.org/documentation/specs/man_pages/hardcopy/GL/html/gl/pixelzoom.html

> Moreover, texture rendering is much faster than using bitmaps
I suppose this will depend on the hardware. I would think that at
least for software only implementations like mesa, bitmap would be
faster since less processing is needed before drawing (e.g. no
transformation matrix)

Shai