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Re: [platform-swt-dev] 'Unsupported color depth' error on Linux
|
Thanks Udaya and Chris for providing
alternatives. Actually, before sending out email I had tried SWT.IMAGE_JPEG
and that worked. However, I am still interested in why the SWT.IMAGE_GIF
case is failing.
Getting to Randy's question, here is
some more detail as to what I am doing:
// We use Eclipse's ImageDescriptor/ImageRegistry
mechanism to initially create all the
// images and then we get
the particular image we want
Image image = ....
ImageData = image.getImageData();
// at this point color depth
is 32
// We then create 8 bit
version of this image
// Step1:create 8 bit palette
PaletteData paletteData
= ...
// Step2:Create new image
data with color depth 8 and using palette above but
// dimensions of original
image
ImageData newImageData
= new ImageData (imageData.width, imageData.height, 8, paletteData);
// Step3:create image
Image newImage = new Image
(display, newImageData);
// Step4:Paint original
image into new image using GCs
GC gc = new GC (newImage);
gc.drawImage (image, 0,
0);
gc.dispose();
// Step5: Retrieve the image
data for the new image
newImageData = newImage.getImageData
();
// at this point the depth
is 24 and consequently the save call throws SWT.Error
Rajeev
| Randy Hudson/Raleigh/IBM@IBMUS
Sent by: platform-swt-dev-admin@xxxxxxxxxxx
07/29/2004 04:00 PM
Please respond to platform-swt-dev
|
To:
platform-swt-dev@xxxxxxxxxxx
cc:
Subject:
Re: [platform-swt-dev] 'Unsupported
color depth' error on Linux |
Rajeev,
You left out an important piece of information. How are you constructing
the Image? If it is simply a new Image(display, width, height), the
color depth is the same as the Display's color depth. So this will
vary even just on windows. We should continue this discussion on
the newsgroup if necessary.
-Randy
| "Udaya Tejwani"
<udayatejwani@xxxxxxxxxxx>
Sent by: platform-swt-dev-admin@xxxxxxxxxxx
07/29/2004 06:26 PM
Please respond to platform-swt-dev
|
To: platform-swt-dev@xxxxxxxxxxx
cc:
Subject: Re: [platform-swt-dev]
'Unsupported color depth' error on Linux |
What Chris simply means is replace the following code
>imageLoader.save(..., SWT.IMAGE_GIF);
with
>imageLoader.save(..., SWT.IMAGE_BMP);
Hope this helps.
Udaya Tejwani
>From: Rajeev Sikka <sikkar@xxxxxxxxxx>
>Reply-To: platform-swt-dev@xxxxxxxxxxx
>
>Hi Chris,
>
>I could not follow your answer. Could you elaborate.
>
>Thanks,
>Rajeev
>
>
>
>
>Christophe Cornu <Christophe_Cornu@xxxxxxxxxx>
>Sent by: platform-swt-dev-admin@xxxxxxxxxxx
>07/29/2004 12:28 PM
>Please respond to platform-swt-dev
>
> To: platform-swt-dev@xxxxxxxxxxx
> cc:
> Subject: Re:
[platform-swt-dev] 'Unsupported color depth'
>error on Linux
>
>
>
>Hi Rajeev,
>
>Unlike GIF, the BMP encoder should support all the bit depths.
>
>Chris
>
>
>
>
>Rajeev Sikka <sikkar@xxxxxxxxxx>
>Sent by: platform-swt-dev-admin@xxxxxxxxxxx
>07/29/2004 01:42 PM
>
>Please respond to
>platform-swt-dev
>
>
>To
>platform-swt-dev@xxxxxxxxxxx
>cc
>
>Subject
>[platform-swt-dev] 'Unsupported color depth' error on Linux
>
>
>Hi,
>
>I have the following code sequence:
>
>...
>Image image = ...
>...
>ImageData imageData = image.getImageData();
>...
>ImageLoader imageLoader = new ImageLoader();
>imageLoader.save(..., SWT.IMAGE_GIF);
>...
>
>This runs fine on windows but gives 'Unsupported color depth' error
on
>Linux. The reason is that the code for Image::getImageData() is different
>for Windows and Linux. On Linux the returned ImageData object has color
>depth 24 (on windows its 8). Here is the code snippet from Image.java
on
>Linux:
>
>ImageData data = "" ImageData(width, height, 24, palette);
>
>Subsequently, the function ImageLoader::save which indirectly calls
>unloadIntoByteStream(ImageData ) in file GIFFileFormat.java throws
a
>SWT.error, since valid color depths are only 1, 4, and 8.
>
>Is there any workaround/alternative way to get around this?
>
>Thanks,
>Rajeev
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