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Commit 2efab6cd authored by Leon Scroggins's avatar Leon Scroggins Committed by Leon Scroggins III
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Reland "Update documentation for DISPLAY_DECORATION" 

The first time this topic landed, it resulted in b/212402133. We avoid
running into this bug with Ib11d46439db57b90486bad07dd90f2cf0822182a.

Remove references to 8 bit alpha.

Original commit message:

After some discussion, we've decided to always set the ScreenDecorations
to DISPLAY_DECORATION. HWC can decide, based on the format, whether to
truly treat it as DISPLAY_DECORATION, or to change to DEVICE
composition.

Update the documentation to reflect this change.

See also I1da3199bacf5877e88876249c60c0a33fcd44c1e.

Bug: 193170859
Test: NA

Change-Id: Iaf5385c38f6827e07b91a9a0a8769fb7a125e847
parent ee4d7008

graphics/composer/aidl/android/hardware/graphics/composer3/Composition.aidl

+7 −6
Original line number Original line Diff line number Diff line
@@ -74,16 +74,17 @@ enum Composition { 
     */

     */

    SIDEBAND = 5,

    SIDEBAND = 5,

    /**

    /**

     * A display decoration layer contains a buffer which is an 8 bit

     * A display decoration layer contains a buffer which is used to provide

     * alpha mask. Pixels in the mask with an alpha of 0 (transparent) will

     * show the content underneath, and pixels with an alpha of 255 will be

     * be rendered in black. An alpha in between will show the content

     * blended with black. This is useful, for example, to provide

     * anti-aliasing on the cutout region/rounded corners on the top and

     * anti-aliasing on the cutout region/rounded corners on the top and

     * bottom of a display.

     * bottom of a display.

     *

     *

     * Pixels in the buffer with an alpha of 0 (transparent) will show the

     * content underneath, and pixels with a max alpha value will be rendered in

     * black. An alpha in between will show the underlying content blended with

     * black.

     *

     * Upon validateDisplay, the device may request a change from this type

     * Upon validateDisplay, the device may request a change from this type

     * to CLIENT.

     * to either DEVICE or CLIENT.

     */

     */

    DISPLAY_DECORATION = 6,

    DISPLAY_DECORATION = 6,

}
 
}