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video/affinetransformationmeta: define the coordinate space used

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Based on the expected output from the already existing usage by androidmedia
and the opengl plugins.

https://bugzilla.gnome.org/show_bug.cgi?id=764667
This commit is contained in:
Matthew Waters 2016-05-14 15:43:24 +03:00
parent fb2c75de68
commit 1e3f5e0ecf
1 changed files with 7 additions and 0 deletions
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7
gst-libs/gst/video/gstvideoaffinetransformationmeta.h
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@ -45,6 +45,13 @@ typedef gboolean (*GstVideoAffineTransformationGetMatrix) (GstVideoAffineTransfo
* matrix. The transformation matrix can be composed with
* gst_video_affine_transformation_meta_apply_matrix().
*
* The vertices operated on are all in the range 0 to 1, not in
* Normalized Device Coordinates (-1 to +1). Transforming points in this space
* are assumed to have an origin at (0.5, 0.5, 0.5) in a left-handed coordinate
* system with the x-axis moving horizontally (positive values to the right),
* the y-axis moving vertically (positive values up the screen) and the z-axis
* perpendicular to the screen (positive values into the screen).
*
* Since: 1.8
*/