Set a layer's chroma operation
#include <gf/gf.h> void gf_layer_set_chroma( gf_layer_t layer, const gf_chroma_t * chroma );
This function sets a layer's chroma operation. Chroma allows you extended control over how the layer is overlaid into the overall display.
|Changes to the layer's parameters are enqueued. You need to call gf_layer_update() to make them take effect.|
The chroma parameters normally control how the contents of the layer are compared with intersecting layers that are behind the specified layer.
|For the chroma operation, the attached layer can be thought of as the “source” while the layer(s) behind it can be thought of as the “destination”.|
QNX Graphics Framework
gf_chroma_t, gf_layer_set_blending(), gf_layer_query(), gf_layer_update()