patches/frameworks/base/0020-Allow-custom-alpha-for-notification-shade-bg-color.patch

   1 From 00722b38ae2b5f0d92d671143298c22d2d30a09b Mon Sep 17 00:00:00 2001
   2 From: Simao Gomes Viana <xdevs23@outlook.com>
   3 Date: Fri, 25 Nov 2016 20:50:29 +0100
   4 Subject: [PATCH 20/51] Allow custom alpha for notification shade bg color
   5
   6 Change-Id: If621df83d994feae0448a734408ba85ac8329325
   7 ---
   8  .../stack/NotificationStackScrollLayout.java       | 40 +++++++++++++++-------
   9  1 file changed, 27 insertions(+), 13 deletions(-)
  10
  11 diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java b/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
  12 index 9c969900015..84a9715cd45 100644
  13 --- a/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
  14 +++ b/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
  15 @@ -431,19 +431,33 @@ public class NotificationStackScrollLayout extends ViewGroup
  16      }
  17
  18      private void updateBackgroundDimming() {
  19 -        float alpha = BACKGROUND_ALPHA_DIMMED + (1 - BACKGROUND_ALPHA_DIMMED) * (1.0f - mDimAmount);
  20 -        alpha *= mBackgroundFadeAmount;
  21 -        // We need to manually blend in the background color
  22 -        int scrimColor = mScrimController.getScrimBehindColor();
  23 -        // SRC_OVER blending Sa + (1 - Sa)*Da, Rc = Sc + (1 - Sa)*Dc
  24 -        float alphaInv = 1 - alpha;
  25 -        int color = Color.argb((int) (alpha * 255 + alphaInv * Color.alpha(scrimColor)),
  26 -                (int) (mBackgroundFadeAmount * Color.red(mBgColor)
  27 -                        + alphaInv * Color.red(scrimColor)),
  28 -                (int) (mBackgroundFadeAmount * Color.green(mBgColor)
  29 -                        + alphaInv * Color.green(scrimColor)),
  30 -                (int) (mBackgroundFadeAmount * Color.blue(mBgColor)
  31 -                        + alphaInv * Color.blue(scrimColor)));
  32 +        int color;
  33 +        if(Color.alpha(mBgColor) == 255) {
  34 +            float alpha = BACKGROUND_ALPHA_DIMMED +
  35 +                    (1 - BACKGROUND_ALPHA_DIMMED) * (1.0f - mDimAmount);
  36 +            alpha *= mBackgroundFadeAmount;
  37 +            // We need to manually blend in the background color
  38 +            int scrimColor = mScrimController.getScrimBehindColor();
  39 +            // SRC_OVER blending Sa + (1 - Sa)*Da, Rc = Sc + (1 - Sa)*Dc
  40 +            float alphaInv = 1 - alpha;
  41 +            color = Color.argb(
  42 +                    (int) (alpha * 255 + alphaInv * Color.alpha(scrimColor)),
  43 +                    (int) (mBackgroundFadeAmount * Color.red(mBgColor)
  44 +                            + alphaInv * Color.red(scrimColor)),
  45 +                    (int) (mBackgroundFadeAmount * Color.green(mBgColor)
  46 +                            + alphaInv * Color.green(scrimColor)),
  47 +                    (int) (mBackgroundFadeAmount * Color.blue(mBgColor)
  48 +                            + alphaInv * Color.blue(scrimColor)));
  49 +        } else {
  50 +            int a = Color.alpha(mBgColor) +
  51 +                Color.alpha(mScrimController.getScrimBehindColor());
  52 +            if(a > 255) a = 255;
  53 +            else if(a < 0) /* shouldn't happen */ a = 0;
  54 +            color = Color.argb(
  55 +                a,
  56 +                Color.red(mBgColor), Color.green(mBgColor), Color.blue(mBgColor)
  57 +            );
  58 +        }
  59          mBackgroundPaint.setColor(color);
  60          invalidate();
  61      }
  62 --
  63 2.11.1
  64