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From jianlizhao <>
Subject how Get Bitmap file from SVG module?
Date Fri, 25 May 2012 01:27:38 GMT
Hi Armin:
Receipt of your reply, I modified my needs.

The original picture I do not need to display and modify,only to provide
data to the extension,used for data analysis and processing. This process
does not need to show only need end result, the end result is saved to a TXT

All requirements are summarized as follows:
1)On screen Display bmp or png file, the bmp or png converted from the
original pictures.

2) In the save file include two files, one is the original file. 
In order to achieve compatibility.

3)on screen when the user delete the BMP file,in the save file, the file
related to this BMP files do not save,that is also deleted.

4)In the extension, the original file for data analysis and processing, and
processing the results are saved to txt file.
It should be based on the screen select the BMP file,access to the
corresponding original file.

Do you have any good suggestions.

Best Regards!

发件人: Armin Le Grand [] 
发送时间: 2012年5月24日 22:57
主题: Re: how Get Bitmap file from SVG module?

	Hi jianlizhao,

On 24.05.2012 16:07, jianlizhao wrote:
> Hi Armin:
> I am very glad to receipt your letter,
> I see the following content in your blog:
> There were also ODF-compatible File Format adaptions needed, more concrete
> the in ODF already contained and described multi-image support. In ODF,
> original SVG is now embedded to the 'Pictures' folder inside the ODF file
> one would expect from such a feature and can be easily extracted (unzip
> ODF file and there you are). There is also a Png file written as
> image. The draw:frame is now multi-image capable (as the spec allows). In
> the case of a SVG it writes a good quality Png and the original SVG as
> draw:image elements. Since older (and other) office versions are only
> capable of loading a single (and thus the first) image, the Png is written
> first. This allows file exchange with other and older offices without
> breaking backward compatibility and/or ODF file exchange.
> I have two questions :
> 1) I would also like to use this method to insert the picture, so that in
> document will retain the original file, the original file  is there are
> other useful.

To achieve this you have to add the needed code to the core (similar as
jpeg and png are added). This includes import code to get the data into
a Bitmap/BitmapEx. This is uniquely held (using a unique ID calculated
based on the bitmap data, there is one calculation defined for each
format) at the GraphicManager and can be accessed using
AFAIK it is also possible to hold the original raw data at the entry in
the GraphicManager (to be able to write the original again in unchanged
form without needing to export it to it's format).
The feature you mentioned above is needed for file formats which differ
in content, in Your case this is not needed since a e.g. reduced data
BitmapEx can be recreated without data loss from your raw data. It makes
no sense to write both, so no need for this feature.

> 2) How do I access the original file.

The Graphic holding it (and the contact with the GraphicManager) may
have it as raw data, but also has a link to a temporary storage (using
the temp on your system) where it is swapped out.
To Access, use Graphic/GraphicObject. I repeat here: It is no easy task
to add a graphic format to the core. I'm also not the specialist for
that, maybe someone else knows in more details about exactly what steps
have to be done to implement it.


> Thanks...
> Best Regards!
> -----邮件原件-----
> 发件人: Armin Le Grand []
> 发送时间: 2012年5月24日 18:10
> 收件人:
> 主题: Re: how Get Bitmap file from SVG module?
> 	Hi jianlizhao,


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