Hi All,
I personally do not like to scale down images that the user wants to
embed in the document. I have not
checked it yet but I believe if Microsoft does it they only do it as a
cache for non embedded images.
I'm pretty sure that we will get flames from users if they print their
documents and the images have
data loss.
On the other hand, I think that Sven Jacoby already implemented
something that loads pictures in a
smaller size. That was needed to optimize rendering of the preview
images for slides. Maybe this can
also be used for speeding up the presentation? I cc'ed him so he
hopefully will comment on this.
Regards,
Christian
Thorsten Behrens wrote:
On Tue, Nov 25, 2008 at 02:01:02PM +0800, sunyinan wrote:
As for a fast scaler, I think there must be two for-loops to
extract the pixels from lines and columns. So from this, it is hard to be faster.
Hi sunyinan,
well, the referenced bmpfast.cxx does speed things up, e.g. by
taking one scanline at a time. But you won't get orders of magnitude
with this, that's true.
So I think scaling image when decoding is an acceptable way even
it slows down the inserting speed. What do you think about it?
I don't like that, at least not if it's done unconditionally. Better
make that an option, and better still, do both - keep the original
file, and have a low-res "preview" bitmap along with it, maybe even
stored on disk.
Another question is that GDI+ is used to "slide show" the presentatio
while GDI to the presentation. As we all know, GDI+ is slower than GDI
( if DrawImage method is repleased by bitblt, the speed is more fast than
now). So, why don't we also use GDI for "Slide show"?
Because GDI doesn't do antialiasing. But feel free to replace the
DrawImage call with a GDI method, the difference in quality is
usually not too big for pictures.
Well we already have an issue with some votes that Impress does not
scale images as
nice as PowerPoint does, so I would not count on this.
Regards,
Christian
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