[osg-users] Viewer raw pixel data

OpenSceneGraph Users osg-users at lists.openscenegraph.org
Mon Nov 9 06:59:26 PST 2020

We are in need of wrapping the OSG library inside a vector graphic 
The vector graphic environment doesn't offer any OpenGL functionality in 
and of itself, however there is a function in its SDK to create and display 
a bitmap image given an array of bytes.

/** Create an image surface from given pixel data.
Data should point to start of top line of bitmap, stride tells how to get 
to next line. 
For upside down windows bitmaps, data = (pBits-(height-1)*stride) and 
stride is a negative number.
@ingroup jsurface
@param data The data.  For example, an RGBA image loaded in memory.
@param format The format of the data.
@param width The width of the new surface.
@param height The height of the new surface.
@param stride The number of bytes between the start of rows in the data 
@param freefun If not NULL, freefun will be called when the surface is 
@param freearg This will be passed to freefun if/when freefun is called.
@return A pointer to the new surface. 
t_jsurface* jgraphics_image_surface_create_for_data(unsigned char *data, 
t_jgraphics_format format, int width, int height, int stride, method 
freefun, void *freearg);

The question is whether it is possible to extract the graphical output of 
the OSG Viewer as raw RGBA bytes. Then we could use the above function to 
basically create a pixel dump of the OSG viewer output and have the 2D 
vector graphic environment display it.

Thanks for any help

- Luigi

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