fix(force invert): fix white-on-white text when text is drawn against a fill rect in the same RenderNode

This fixes issues with custom Views that draw background and text in the
same View/RenderNode. Instead of trying to force the individual paints
to be dark, we simply invert the whole view.

Adds a new hasFill() member to DisplayList and Canvas so that we record
when the RenderNode has a call that fills the background.

Also adds a new Container usage hint type, for this exact situation.

Bug: 282821643
Bug: 293883260
Test: RenderNodeTests.cpp:
  mmm -j8 frameworks/base/libs/hwui && adb push $ANDROID_PRODUCT_OUT/data/nativetest/hwui_unit_tests/hwui_unit_tests     /data/nativetest/hwui_unit_tests/hwui_unit_tests && adb shell /data/nativetest/hwui_unit_tests/hwui_unit_tests

Change-Id: Ia0fe9c739bf07c1f3a8508d3f295a1dc54ee48f9

libs/hwui/RenderNode.cpp

diff --git a/libs/hwui/RenderNode.cpp b/libs/hwui/RenderNode.cpp
index 3e131bc..0b42c88 100644
--- a/libs/hwui/RenderNode.cpp
+++ b/libs/hwui/RenderNode.cpp
@@ -427,7 +427,13 @@
         children.push_back(node);
     });
     if (mDisplayList.hasText()) {
-        usage = UsageHint::Foreground;
+        if (mDisplayList.hasFill()) {
+            // Handle a special case for custom views that draw both text and background in the
+            // same RenderNode, which would otherwise be altered to white-on-white text.
+            usage = UsageHint::Container;
+        } else {
+            usage = UsageHint::Foreground;
+        }
     }
     if (usage == UsageHint::Unknown) {
         if (children.size() > 1) {
@@ -453,8 +459,13 @@
             drawn.join(bounds);
         }
     }
-    mDisplayList.applyColorTransform(
-            usage == UsageHint::Background ? ColorTransform::Dark : ColorTransform::Light);
+
+    if (usage == UsageHint::Container) {
+        mDisplayList.applyColorTransform(ColorTransform::Invert);
+    } else {
+        mDisplayList.applyColorTransform(usage == UsageHint::Background ? ColorTransform::Dark
+                                                                        : ColorTransform::Light);
+    }
 }
 
 void RenderNode::pushStagingDisplayListChanges(TreeObserver& observer, TreeInfo& info) {