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Set layer blending
#include <gf/gf.h>
void gf_layer_set_blending( gf_layer_t layer,
const gf_alpha_t * alpha );
- layer
- A pointer to a gf_layer_t handle of the layer you want to set alpha blending for.
- alpha
- A gf_alpha_t structure describing the new blending.
gf
This function gives you control over layer blending (that is, opacity), allowing you to make a layer fully opaque, transparent, or semitransparent.
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Changes to the layer's parameters are enqueued. You need to call gf_layer_update() to make them take effect. |
The blending parameters normally control how the contents of the layer are blended with intersecting layers that are behind the specified layer.
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- For the blending operation, the attached layer can be thought of as the “source” while the layer(s) behind can be thought of as the “destination.”
- There are hardware limitations to alpha blending operations. Please see the “Hardware Capabilities” Appendix for more details.
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QNX Graphics Framework
Safety: | |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
gf_alpha_t,
gf_layer_query(),
gf_layer_update()
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