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clutter/stage-view: Add getter for getting the offscreen blit transform

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This will be used to invert the transform in the nested mode, making it
possible to test offscreen texture based transform using the nested
backend.

https://bugzilla.gnome.org/show_bug.cgi?id=779745
This commit is contained in:
Jonas Ådahl 2017-03-07 18:02:52 +08:00
parent 615587cd06
commit c5dc0f4a2e
2 changed files with 14 additions and 2 deletions
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12
clutter/clutter/clutter-stage-view.c
View File

@ -179,16 +179,24 @@ clutter_stage_view_set_dirty_projection (ClutterStageView *view,
priv->dirty_projection = dirty;
}
void
clutter_stage_view_get_offscreen_transformation_matrix (ClutterStageView *view,
CoglMatrix *matrix)
{
ClutterStageViewClass *view_class = CLUTTER_STAGE_VIEW_GET_CLASS (view);
view_class->get_offscreen_transformation_matrix (view, matrix);
}
void
clutter_stage_view_transform_to_onscreen (ClutterStageView *view,
gfloat *x,
gfloat *y)
{
ClutterStageViewClass *view_class = CLUTTER_STAGE_VIEW_GET_CLASS (view);
gfloat z = 0, w = 1;
CoglMatrix matrix;
view_class->get_offscreen_transformation_matrix (view, &matrix);
clutter_stage_view_get_offscreen_transformation_matrix (view, &matrix);
cogl_matrix_get_inverse (&matrix, &matrix);
cogl_matrix_transform_point (&matrix, x, y, &z, &w);
}

4
clutter/clutter/clutter-stage-view.h
View File

@ -70,4 +70,8 @@ gboolean clutter_stage_view_is_dirty_projection (ClutterStageView *view);
void clutter_stage_view_set_dirty_projection (ClutterStageView *view,
gboolean dirty);
CLUTTER_AVAILABLE_IN_MUTTER
void clutter_stage_view_get_offscreen_transformation_matrix (ClutterStageView *view,
CoglMatrix *matrix);
#endif /* __CLUTTER_STAGE_VIEW_H__ */