Hello Antonio,
This is a good idea, but there is a problem. Using testTextPixmap I
obtained an ImagePtr of the text I wanna draw:
ImagePtr imagePtr = face->makeImage(layoutResult, offset);
then I set the foreground:
ImageForegroundPtr imp = ImageForeground::create( );
beginEditCP(imp);
//NOTE: the position values are between 0 and 1
//and are relative to the viewport!
ImagePtr imagePtr = oText->getImage();
imp->addImage( imagePtr, Pnt2f(0.1,0) );
endEditCP(imp);
viewport->getMFForegrounds()->push_back(imp);
But, when I start my program no text is drawn and this error occurs:
WARNING: Window:frameExit: Caught stry OpenGL error not valid
enumerator (0x500).
Someone can help me? Loading a png as ImagePtr the program works
fine, but not with the ImagePtr obtained by TextPixmapFace.
The problem is that the image created by the text function uses the
pixel format GL_INTENSITY. This works when the image is used as a
texture (inside a TextureChunk). But the ImageForeground uses a
glDrawPixels() call to copy the image to the screen, and glDrawPixels
() does not handle GL_INTENSITY.
As a workaround, you can change the pixelformat by calling
setPixelFormat() on the image, eg. to GL_LUMINANCE or GL_ALPHA. I do
not know how the result looks like - I never used glDrawPixels().
Another solution is to convert the image to GL_LUMINANCE_ALPHA by
calling the reformat() method.
Bye,
Patrick
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