gf_layer_set_blending()

Set layer blending

Synopsis:

#include <gf/gf.h>

void gf_layer_set_blending( gf_layer_t layer,
                            const gf_alpha_t * alpha );

Arguments:

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.

Library:

gf

Description:

This function gives you control over layer blending (that is, opacity), allowing you to make a layer fully opaque, transparent, or semitransparent.

Note:

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.

Note:

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.

Classification:

QNX Graphics Framework

Safety:
Interrupt handler	No
Signal handler	No
Thread	Yes

See also:

gf_alpha_t, gf_layer_query(), gf_layer_update()