[Libxine-java-devel] RFC: OSD API

[Matthias R. <mri...@in...>]

Hi

After a quick hack last week, I've taken a new approach to color  
handling. The "problem" with xine's OSD support is that a color  
palette with 256 entries has to be used, with #0 being transparent.  
For drawing lines and boxes and rendering text this is amble colors.  
For images, e.g., to show album cover or movie posters, it is a bit  
limited. I have followed the idea of Java's BufferedImage, which uses  
a color palette with 6 x 6 x 6 entries to encode RGB colors (total  
216) and using the remainder for gray levels. In the current SVN  
version, the 6x6x6 RGB cube is used from color index 30 until 245, and  
246 to 255 contain 10 more gray levels. By this, there is a color  
palette of 16 gray levels. The BuffereImage class is able to render  
arbitrary images using the color palette. As the color palette is  
fixed, it is also possible to show multiple images at the same time.

Now, I can imagine that the album cover might be faded in. For this,  
the alpha value of the image color range (30-255) can  be set with  
setImageAlpha(..).
With this scheme, the first 30 colors can be used for fonts and UI  
drawing under the full control of your application, while at the same  
time, thumbnails of images can be blended in. Note, all images have  
the same alpha value, it is not possible to only fade a single one.

comments?

Matthias

p.s. carlo bramix found a major bug in xine-lib for windows. I guess  
some other quirks have to be dealt with, but, by this, a windows  
version of libxine-java gets possible.