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Set a layer's destination viewport
#include <gf/gf.h>
void gf_layer_set_dst_viewport( gf_layer_t layer,
int x1,
int y1,
int x2,
int y2 );
- layer
- A pointer to a gf_layer_t handle of the layer you want to set the destination viewport for.
- x1, y1, x2, y2
- The coordinates of the bounding rectangle for the destination viewport. The x1,y1 coordinates define the upper-left corner of the rectangle, and the x2, y2 coordinates define the lower-right corner.
The rectangle's coordinates must be within the bounds of the target display.
gf
This function sets a layer's desination viewport.
There may be hardware limitations on viewports. Check these bits in gf_layer_info_t.caps filled in by gf_layer_query():
- GF_LAYER_CAP_PAN_SOURCE — the source viewport position can be adjusted.
- GF_LAYER_CAP_SIZE_DEST — the size of the destination viewport can be different from the size of the source viewport.
- GF_LAYER_CAP_PAN_DEST — the position of the destination viewport can be adjusted.
|
Changes to the layer's parameters are enqueued. You need to call gf_layer_update() to make them take effect. |
QNX Graphics Framework
Safety: | |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
gf_layer_set_src_viewport(),
gf_layer_query()
“Viewports” in the Working with Layers, Surfaces and Contexts chapter
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