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Re: [platform-swt-dev] GTK graphics status
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My code is not platform specific. I argue that most aren't interested in
stepping through platform specific code.
I am writing to the SWT API. If something doesn't work right, I test it on
another SWT platform. If it still doesn't work right, it's my problem.
Otherwise, it's SWT's problem.
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| | Steve_Northover@xxxxxxx|
| | Sent by: |
| | platform-swt-dev-admin@|
| | eclipse.org |
| | |
| | |
| | 03/20/2002 01:28 PM |
| | Please respond to |
| | platform-swt-dev |
| | |
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| To: platform-swt-dev@xxxxxxxxxxx |
| cc: |
| Subject: Re: [platform-swt-dev] GTK graphics status |
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Maybe we should replace the code you write with C natives so that people
don't have to step through it. <g>
Steve
"Randy Hudson"
<hudsonr@xxxxxxxxxx> To:
Sent by: platform-swt-dev@xxxxxxxxxxx
platform-swt-dev-admin@eclipse. cc:
org Subject: Re:
[platform-swt-dev] GTK graphics status
03/19/02 02:09 PM
Please respond to
platform-swt-dev
Scaling an Image should be fast. Developers shouldn't be subject to a
10-100x performance hit because they are using Java.
If you are looping over every pixel, would you consider doing this in
natives? I know the SWT philisophy, but I don't think the average
developer will benefit from stepping through such code in a Java debugger.
|---------+---------------------------------->
| | Havoc Pennington |
| | <hp@xxxxxxxxxx> |
| | Sent by: |
| | platform-swt-dev-admin@|
| | eclipse.org |
| | |
| | |
| | 03/19/2002 01:03 PM |
| | Please respond to |
| | platform-swt-dev |
| | |
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| To: platform-swt-dev@xxxxxxxxxxx
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| cc:
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| Subject: Re: [platform-swt-dev] GTK graphics status
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Silenio_Quarti@xxxxxxx writes:
> When a image has transparency (e.g. icons, gifs with transparent pixel),
> SWT creates
> a GdkPixmap for the color part of the image and a GdkBitmap for the mask.
>
I guess the hard bit is "Image implements Drawable" - otherwise you
could just implement Image as a pixbuf instead of a pixmap.
> We are using GdkPixBuf to scale the GdkPixmap. If we use a different
> algorithm to scale the GdkBitmap, we might have problems, since different
> algorithms might replicate different pixels.
Good point.
> So if we use our own algorithm the scale a GdkBitmap, I believe we will
> have to
> use it the scale its associated GdkPixmap too.
As you probably know that's a world of pain, since you have around 20
common GdkImage pixel formats to deal with, each in two possible byte
orders...
> Right now, we are getting a GdkPixBuf with alha channel from the
> GdkPixmap,
> getting the mask data using GdkImage, combining them by replacing the
> alpha
> channel with appropriate values (e.g. 1 -> 255, 0 -> 0), scaling the
> GdkPixBuf and
> then redering to the destination drawable by calling
> gdk_pixbuf_render_to_drawable_alpha.
>
> This is somewhat inneficient though.
Yeah it's pretty ugly, but I can't think of anything much better. It
will be slow but not _that_ bad, as long as you don't do it on every
expose event or something.
There's a gdk_pixbuf_render_pixmap_and_mask() convenience function
too, FWIW, which you can use to generate a new pixmap/mask after
scaling the pixbuf.
Havoc
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