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Commit 6c06ebe4 authored by Alan Viverette's avatar Alan Viverette Committed by Dan Stoza
Browse files

Adjust display inversion matrix to account for luminance 

Bug: 20346301
Change-Id: I10633705f2bfddbdeec063f9489a4f8679b9e8ee
(cherry picked from commit 64375180)
parent 815d9bb1

services/accessibility/java/com/android/server/accessibility/DisplayAdjustmentUtils.java

+11 −5
Original line number Diff line number Diff line
@@ -41,11 +41,17 @@ class DisplayAdjustmentUtils { 
             0,      0,      0, 1

    };



    /** Matrix and offset used for value-only display inversion. */

    /**

     * Matrix and offset used for luminance inversion. Represents a transform

     * from RGB to YIQ color space, rotation around the Y axis by 180 degrees,

     * transform back to RGB color space, and subtraction from 1. The last row

     * represents a non-multiplied addition, see surfaceflinger's ProgramCache

     * for full implementation details.

     */

    private static final float[] INVERSION_MATRIX_VALUE_ONLY = new float[] {

           0, -.5f, -.5f, 0,

        -.5f,    0, -.5f, 0,

        -.5f, -.5f,    0, 0,

        0.402f, -0.598f, -0.599f, 0,

       -1.174f, -0.174f, -1.175f, 0,

       -0.228f, -0.228f,  0.772f, 0,

             1,       1,       1, 1

    };