fix(high contrast text): fix highlight/selection is obscured by high contrast text background rectangle

Since high contrast text draws a solid rectangle background behind the
text, it covers up the highlights and selections. In this case we draw
over the top of the text with a blend mode that ensures the text stays
high-contrast.

Fix: 323964406
Bug: 186567103
Flag: ACONFIG com.android.graphics.hwui.flags.high_contrast_text_small_text_rect TEAMFOOD
Test: atest core/tests/coretests/src/android/text/LayoutTest.java
Test: manual
1. adb shell setenforce 0 && adb shell setprop persist.device_config.aconfig_flags.accessibility.com.android.graphics.hwui.flags.high_contrast_text_small_text_rect true && adb shell stop && adb shell start
2. Settings -> Accessibility -> Display Size and Text
3. Turn on High Contrast Text
4. Select some text. The selection should be visible

Change-Id: I3ea2835f2a8bdfaf646f140f3290837535080a5c

6 files changed, 394 insertions, 11 deletions

diff --git a/core/java/android/text/Layout.java b/core/java/android/text/Layout.java
index 8e52af3fb57b..8dee4b19c6d3 100644
--- a/core/java/android/text/Layout.java
+++ b/core/java/android/text/Layout.java
@@ -16,6 +16,7 @@
 
 package android.text;
 
+import static com.android.graphics.hwui.flags.Flags.highContrastTextLuminance;
 import static com.android.text.flags.Flags.FLAG_FIX_LINE_HEIGHT_FOR_LOCALE;
 import static com.android.text.flags.Flags.FLAG_USE_BOUNDS_FOR_WIDTH;
 import static com.android.text.flags.Flags.FLAG_LETTER_SPACING_JUSTIFICATION;
@@ -28,7 +29,9 @@ import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.SuppressLint;
 import android.compat.annotation.UnsupportedAppUsage;
+import android.graphics.BlendMode;
 import android.graphics.Canvas;
+import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.Rect;
@@ -46,7 +49,9 @@ import android.text.style.ReplacementSpan;
 import android.text.style.TabStopSpan;
 import android.widget.TextView;
 
+import com.android.graphics.hwui.flags.Flags;
 import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.graphics.ColorUtils;
 import com.android.internal.util.ArrayUtils;
 import com.android.internal.util.GrowingArrayUtils;
 
@@ -480,9 +485,23 @@ public abstract class Layout {
         int lastLine = TextUtils.unpackRangeEndFromLong(lineRange);
         if (lastLine < 0) return;
 
-        drawWithoutText(canvas, highlightPaths, highlightPaints, selectionPath, selectionPaint,
-                cursorOffsetVertical, firstLine, lastLine);
+        if (shouldDrawHighlightsOnTop(canvas)) {
+            drawBackground(canvas, firstLine, lastLine);
+        } else {
+            drawWithoutText(canvas, highlightPaths, highlightPaints, selectionPath, selectionPaint,
+                    cursorOffsetVertical, firstLine, lastLine);
+        }
+
         drawText(canvas, firstLine, lastLine);
+
+        // Since high contrast text draws a solid rectangle background behind the text, it covers up
+        // the highlights and selections. In this case we draw over the top of the text with a
+        // blend mode that ensures the text stays high-contrast.
+        if (shouldDrawHighlightsOnTop(canvas)) {
+            drawHighlights(canvas, highlightPaths, highlightPaints, selectionPath, selectionPaint,
+                    cursorOffsetVertical, firstLine, lastLine);
+        }
+
         if (leftShift != 0) {
             // Manually translate back to the original position because of b/324498002, using
             // save/restore disappears the toggle switch drawables.
@@ -490,6 +509,19 @@ public abstract class Layout {
         }
     }
 
+    private static boolean shouldDrawHighlightsOnTop(Canvas canvas) {
+        return Flags.highContrastTextSmallTextRect() && canvas.isHighContrastTextEnabled();
+    }
+
+    private static Paint setToHighlightPaint(Paint p, BlendMode blendMode, Paint outPaint) {
+        if (p == null) return null;
+        outPaint.set(p);
+        outPaint.setBlendMode(blendMode);
+        // Yellow for maximum contrast
+        outPaint.setColor(Color.YELLOW);
+        return outPaint;
+    }
+
     /**
      * Draw text part of this layout.
      *
@@ -542,11 +574,28 @@ public abstract class Layout {
             int firstLine,
             int lastLine) {
         drawBackground(canvas, firstLine, lastLine);
+        drawHighlights(canvas, highlightPaths, highlightPaints, selectionPath, selectionPaint,
+                cursorOffsetVertical, firstLine, lastLine);
+    }
+
+    /**
+     * @hide public for Editor.java
+     */
+    public void drawHighlights(
+            @NonNull Canvas canvas,
+            @Nullable List<Path> highlightPaths,
+            @Nullable List<Paint> highlightPaints,
+            @Nullable Path selectionPath,
+            @Nullable Paint selectionPaint,
+            int cursorOffsetVertical,
+            int firstLine,
+            int lastLine) {
         if (highlightPaths == null && highlightPaints == null) {
             return;
         }
         if (cursorOffsetVertical != 0) canvas.translate(0, cursorOffsetVertical);
         try {
+            BlendMode blendMode = determineHighContrastHighlightBlendMode(canvas);
             if (highlightPaths != null) {
                 if (highlightPaints == null) {
                     throw new IllegalArgumentException(
@@ -559,7 +608,12 @@ public abstract class Layout {
                 }
                 for (int i = 0; i < highlightPaths.size(); ++i) {
                     final Path highlight = highlightPaths.get(i);
-                    final Paint highlightPaint = highlightPaints.get(i);
+                    Paint highlightPaint = highlightPaints.get(i);
+                    if (shouldDrawHighlightsOnTop(canvas)) {
+                        highlightPaint = setToHighlightPaint(highlightPaint, blendMode,
+                                mWorkPlainPaint);
+                    }
+
                     if (highlight != null) {
                         canvas.drawPath(highlight, highlightPaint);
                     }
@@ -567,6 +621,10 @@ public abstract class Layout {
             }
 
             if (selectionPath != null) {
+                if (shouldDrawHighlightsOnTop(canvas)) {
+                    selectionPaint = setToHighlightPaint(selectionPaint, blendMode,
+                            mWorkPlainPaint);
+                }
                 canvas.drawPath(selectionPath, selectionPaint);
             }
         } finally {
@@ -574,6 +632,31 @@ public abstract class Layout {
         }
     }
 
+    @Nullable
+    private BlendMode determineHighContrastHighlightBlendMode(Canvas canvas) {
+        if (!shouldDrawHighlightsOnTop(canvas)) {
+            return null;
+        }
+
+        return isHighContrastTextDark() ? BlendMode.MULTIPLY : BlendMode.DIFFERENCE;
+    }
+
+    private boolean isHighContrastTextDark() {
+        // High-contrast text mode
+        // Determine if the text is black-on-white or white-on-black, so we know what blendmode will
+        // give the highest contrast and most realistic text color.
+        // This equation should match the one in libs/hwui/hwui/DrawTextFunctor.h
+        if (highContrastTextLuminance()) {
+            var lab = new double[3];
+            ColorUtils.colorToLAB(mPaint.getColor(), lab);
+            return lab[0] < 0.5;
+        } else {
+            var color = mPaint.getColor();
+            int channelSum = Color.red(color) + Color.green(color) + Color.blue(color);
+            return channelSum < (128 * 3);
+        }
+    }
+
     private boolean isJustificationRequired(int lineNum) {
         if (mJustificationMode == JUSTIFICATION_MODE_NONE) return false;
         final int lineEnd = getLineEnd(lineNum);
@@ -3396,7 +3479,8 @@ public abstract class Layout {
     private CharSequence mText;
     @UnsupportedAppUsage
     private TextPaint mPaint;
-    private TextPaint mWorkPaint = new TextPaint();
+    private final TextPaint mWorkPaint = new TextPaint();
+    private final Paint mWorkPlainPaint = new Paint();
     private int mWidth;
     private Alignment mAlignment = Alignment.ALIGN_NORMAL;
     private float mSpacingMult;
diff --git a/core/java/android/widget/Editor.java b/core/java/android/widget/Editor.java
index 57d268ced6f4..139ebc38706e 100644
--- a/core/java/android/widget/Editor.java
+++ b/core/java/android/widget/Editor.java
@@ -19,6 +19,8 @@ package android.widget;
 import static android.view.ContentInfo.SOURCE_DRAG_AND_DROP;
 import static android.widget.TextView.ACCESSIBILITY_ACTION_SMART_START_ID;
 
+import static com.android.graphics.hwui.flags.Flags.highContrastTextSmallTextRect;
+
 import android.R;
 import android.animation.ValueAnimator;
 import android.annotation.IntDef;
@@ -2151,8 +2153,15 @@ public class Editor {
         int lastLine = TextUtils.unpackRangeEndFromLong(lineRange);
         if (lastLine < 0) return;
 
-        layout.drawWithoutText(canvas, highlightPaths, highlightPaints, selectionHighlight,
-                selectionHighlightPaint, cursorOffsetVertical, firstLine, lastLine);
+        boolean shouldDrawHighlightsOnTop = highContrastTextSmallTextRect()
+                && canvas.isHighContrastTextEnabled();
+
+        if (!shouldDrawHighlightsOnTop) {
+            layout.drawWithoutText(canvas, highlightPaths, highlightPaints, selectionHighlight,
+                    selectionHighlightPaint, cursorOffsetVertical, firstLine, lastLine);
+        } else {
+            layout.drawBackground(canvas, firstLine, lastLine);
+        }
 
         if (layout instanceof DynamicLayout) {
             if (mTextRenderNodes == null) {
@@ -2226,6 +2235,11 @@ public class Editor {
             // Boring layout is used for empty and hint text
             layout.drawText(canvas, firstLine, lastLine);
         }
+
+        if (shouldDrawHighlightsOnTop) {
+            layout.drawHighlights(canvas, highlightPaths, highlightPaints, selectionHighlight,
+                    selectionHighlightPaint, cursorOffsetVertical, firstLine, lastLine);
+        }
     }
 
     private int drawHardwareAcceleratedInner(Canvas canvas, Layout layout, Path highlight,
diff --git a/core/tests/coretests/src/android/text/LayoutTest.java b/core/tests/coretests/src/android/text/LayoutTest.java
index 5649e7118fd5..f60eff69690a 100644
--- a/core/tests/coretests/src/android/text/LayoutTest.java
+++ b/core/tests/coretests/src/android/text/LayoutTest.java
@@ -16,6 +16,11 @@
 
 package android.text;
 
+import static com.android.graphics.hwui.flags.Flags.FLAG_HIGH_CONTRAST_TEXT_SMALL_TEXT_RECT;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth.assertWithMessage;
+
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -26,11 +31,16 @@ import static org.junit.Assert.fail;
 
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
+import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.platform.test.annotations.Presubmit;
+import android.platform.test.annotations.RequiresFlagsDisabled;
+import android.platform.test.annotations.RequiresFlagsEnabled;
+import android.platform.test.flag.junit.CheckFlagsRule;
+import android.platform.test.flag.junit.DeviceFlagsValueProvider;
 import android.text.Layout.Alignment;
 import android.text.style.StrikethroughSpan;
 
@@ -38,6 +48,7 @@ import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -49,6 +60,9 @@ import java.util.Locale;
 @SmallTest
 @RunWith(AndroidJUnit4.class)
 public class LayoutTest {
+    @Rule
+    public final CheckFlagsRule mCheckFlagsRule = DeviceFlagsValueProvider.createCheckFlagsRule();
+
     private static final int LINE_COUNT = 5;
     private static final int LINE_HEIGHT = 12;
     private static final int LINE_DESCENT = 4;
@@ -638,22 +652,268 @@ public class LayoutTest {
         }
     }
 
-    private final class MockCanvas extends Canvas {
+    @Test
+    @RequiresFlagsEnabled(FLAG_HIGH_CONTRAST_TEXT_SMALL_TEXT_RECT)
+    public void highContrastTextEnabled_testDrawSelectionAndHighlight_drawsHighContrastSelectionAndHighlight() {
+        Layout layout = new MockLayout(LAYOUT_TEXT, mTextPaint, mWidth,
+                mAlign, mSpacingMult, mSpacingAdd);
+
+        List<Path> highlightPaths = new ArrayList<>();
+        List<Paint> highlightPaints = new ArrayList<>();
+
+        Path selectionPath = new Path();
+        RectF selectionRect = new RectF(0f, 0f, mWidth / 2f, LINE_HEIGHT);
+        selectionPath.addRect(selectionRect, Path.Direction.CW);
+        highlightPaths.add(selectionPath);
+
+        Paint selectionPaint = new Paint();
+        selectionPaint.setColor(Color.CYAN);
+        highlightPaints.add(selectionPaint);
+
+        final int width = 256;
+        final int height = 256;
+        MockCanvas c = new MockCanvas(width, height);
+        c.setHighContrastTextEnabled(true);
+        layout.draw(c, highlightPaths, highlightPaints, selectionPath, selectionPaint,
+                /* cursorOffsetVertical= */ 0);
+        List<MockCanvas.DrawCommand> drawCommands = c.getDrawCommands();
+        var textsDrawn = LINE_COUNT;
+        var highlightsDrawn = 2;
+        assertThat(drawCommands.size()).isEqualTo(textsDrawn + highlightsDrawn);
+
+        var highlightsFound = 0;
+        var curLineIndex = 0;
+        for (int i = 0; i < drawCommands.size(); i++) {
+            MockCanvas.DrawCommand drawCommand = drawCommands.get(i);
+
+            if (drawCommand.path != null) {
+                assertThat(drawCommand.path).isEqualTo(selectionPath);
+                assertThat(drawCommand.paint.getColor()).isEqualTo(Color.YELLOW);
+                assertThat(drawCommand.paint.getBlendMode()).isNotNull();
+                highlightsFound++;
+            } else if (drawCommand.text != null) {
+                int start = layout.getLineStart(curLineIndex);
+                int end = layout.getLineEnd(curLineIndex);
+                assertEquals(LAYOUT_TEXT.toString().substring(start, end), drawCommand.text);
+                curLineIndex++;
+
+                assertWithMessage("highlight is drawn on top of text")
+                        .that(highlightsFound).isEqualTo(0);
+            }
+        }
+
+        assertThat(highlightsFound).isEqualTo(2);
+    }
+
+    @Test
+    @RequiresFlagsEnabled(FLAG_HIGH_CONTRAST_TEXT_SMALL_TEXT_RECT)
+    public void highContrastTextEnabled_testDrawHighlight_drawsHighContrastHighlight() {
+        Layout layout = new MockLayout(LAYOUT_TEXT, mTextPaint, mWidth,
+                mAlign, mSpacingMult, mSpacingAdd);
+
+        List<Path> highlightPaths = new ArrayList<>();
+        List<Paint> highlightPaints = new ArrayList<>();
+
+        Path selectionPath = new Path();
+        RectF selectionRect = new RectF(0f, 0f, mWidth / 2f, LINE_HEIGHT);
+        selectionPath.addRect(selectionRect, Path.Direction.CW);
+        highlightPaths.add(selectionPath);
+
+        Paint selectionPaint = new Paint();
+        selectionPaint.setColor(Color.CYAN);
+        highlightPaints.add(selectionPaint);
+
+        final int width = 256;
+        final int height = 256;
+        MockCanvas c = new MockCanvas(width, height);
+        c.setHighContrastTextEnabled(true);
+        layout.draw(c, highlightPaths, highlightPaints, /* selectionPath= */ null,
+                /* selectionPaint= */ null, /* cursorOffsetVertical= */ 0);
+        List<MockCanvas.DrawCommand> drawCommands = c.getDrawCommands();
+        var textsDrawn = LINE_COUNT;
+        var highlightsDrawn = 1;
+        assertThat(drawCommands.size()).isEqualTo(textsDrawn + highlightsDrawn);
+
+        var highlightsFound = 0;
+        var curLineIndex = 0;
+        for (int i = 0; i < drawCommands.size(); i++) {
+            MockCanvas.DrawCommand drawCommand = drawCommands.get(i);
+
+            if (drawCommand.path != null) {
+                assertThat(drawCommand.path).isEqualTo(selectionPath);
+                assertThat(drawCommand.paint.getColor()).isEqualTo(Color.YELLOW);
+                assertThat(drawCommand.paint.getBlendMode()).isNotNull();
+                highlightsFound++;
+            } else if (drawCommand.text != null) {
+                int start = layout.getLineStart(curLineIndex);
+                int end = layout.getLineEnd(curLineIndex);
+                assertEquals(LAYOUT_TEXT.toString().substring(start, end), drawCommand.text);
+                curLineIndex++;
+
+                assertWithMessage("highlight is drawn on top of text")
+                        .that(highlightsFound).isEqualTo(0);
+            }
+        }
+
+        assertThat(highlightsFound).isEqualTo(1);
+    }
+
+    @Test
+    @RequiresFlagsEnabled(FLAG_HIGH_CONTRAST_TEXT_SMALL_TEXT_RECT)
+    public void highContrastTextDisabledByDefault_testDrawHighlight_drawsNormalHighlightBehind() {
+        Layout layout = new MockLayout(LAYOUT_TEXT, mTextPaint, mWidth,
+                mAlign, mSpacingMult, mSpacingAdd);
+
+        List<Path> highlightPaths = new ArrayList<>();
+        List<Paint> highlightPaints = new ArrayList<>();
+
+        Path selectionPath = new Path();
+        RectF selectionRect = new RectF(0f, 0f, mWidth / 2f, LINE_HEIGHT);
+        selectionPath.addRect(selectionRect, Path.Direction.CW);
+        highlightPaths.add(selectionPath);
+
+        Paint selectionPaint = new Paint();
+        selectionPaint.setColor(Color.CYAN);
+        highlightPaints.add(selectionPaint);
+
+        final int width = 256;
+        final int height = 256;
+        MockCanvas c = new MockCanvas(width, height);
+        layout.draw(c, highlightPaths, highlightPaints, /* selectionPath= */ null,
+                /* selectionPaint= */ null, /* cursorOffsetVertical= */ 0);
+        List<MockCanvas.DrawCommand> drawCommands = c.getDrawCommands();
+        var textsDrawn = LINE_COUNT;
+        var highlightsDrawn = 1;
+        assertThat(drawCommands.size()).isEqualTo(textsDrawn + highlightsDrawn);
+
+        var highlightsFound = 0;
+        var curLineIndex = 0;
+        for (int i = 0; i < drawCommands.size(); i++) {
+            MockCanvas.DrawCommand drawCommand = drawCommands.get(i);
+
+            if (drawCommand.path != null) {
+                assertThat(drawCommand.path).isEqualTo(selectionPath);
+                assertThat(drawCommand.paint.getColor()).isEqualTo(Color.CYAN);
+                assertThat(drawCommand.paint.getBlendMode()).isNull();
+                highlightsFound++;
+            } else if (drawCommand.text != null) {
+                int start = layout.getLineStart(curLineIndex);
+                int end = layout.getLineEnd(curLineIndex);
+                assertEquals(LAYOUT_TEXT.toString().substring(start, end), drawCommand.text);
+                curLineIndex++;
+
+                assertWithMessage("highlight is drawn behind text")
+                        .that(highlightsFound).isGreaterThan(0);
+            }
+        }
+
+        assertThat(highlightsFound).isEqualTo(1);
+    }
+
+    @Test
+    @RequiresFlagsDisabled(FLAG_HIGH_CONTRAST_TEXT_SMALL_TEXT_RECT)
+    public void highContrastTextEnabledButFlagOff_testDrawHighlight_drawsNormalHighlightBehind() {
+        Layout layout = new MockLayout(LAYOUT_TEXT, mTextPaint, mWidth,
+                mAlign, mSpacingMult, mSpacingAdd);
+
+        List<Path> highlightPaths = new ArrayList<>();
+        List<Paint> highlightPaints = new ArrayList<>();
+
+        Path selectionPath = new Path();
+        RectF selectionRect = new RectF(0f, 0f, mWidth / 2f, LINE_HEIGHT);
+        selectionPath.addRect(selectionRect, Path.Direction.CW);
+        highlightPaths.add(selectionPath);
+
+        Paint selectionPaint = new Paint();
+        selectionPaint.setColor(Color.CYAN);
+        highlightPaints.add(selectionPaint);
+
+        final int width = 256;
+        final int height = 256;
+        MockCanvas c = new MockCanvas(width, height);
+        c.setHighContrastTextEnabled(true);
+        layout.draw(c, highlightPaths, highlightPaints, /* selectionPath= */ null,
+                /* selectionPaint= */ null, /* cursorOffsetVertical= */ 0);
+        List<MockCanvas.DrawCommand> drawCommands = c.getDrawCommands();
+        var textsDrawn = LINE_COUNT;
+        var highlightsDrawn = 1;
+        assertThat(drawCommands.size()).isEqualTo(textsDrawn + highlightsDrawn);
 
-        class DrawCommand {
+        var highlightsFound = 0;
+        var curLineIndex = 0;
+        for (int i = 0; i < drawCommands.size(); i++) {
+            MockCanvas.DrawCommand drawCommand = drawCommands.get(i);
+
+            if (drawCommand.path != null) {
+                assertThat(drawCommand.path).isEqualTo(selectionPath);
+                assertThat(drawCommand.paint.getColor()).isEqualTo(Color.CYAN);
+                assertThat(drawCommand.paint.getBlendMode()).isNull();
+                highlightsFound++;
+            } else if (drawCommand.text != null) {
+                int start = layout.getLineStart(curLineIndex);
+                int end = layout.getLineEnd(curLineIndex);
+                assertEquals(LAYOUT_TEXT.toString().substring(start, end), drawCommand.text);
+                curLineIndex++;
+
+                assertWithMessage("highlight is drawn behind text")
+                        .that(highlightsFound).isGreaterThan(0);
+            }
+        }
+
+        assertThat(highlightsFound).isEqualTo(1);
+    }
+
+    @Test
+    public void mockCanvasHighContrastOverridesCorrectly() {
+        var canvas = new MockCanvas(100, 100);
+
+        assertThat(canvas.isHighContrastTextEnabled()).isFalse();
+        canvas.setHighContrastTextEnabled(true);
+        assertThat(canvas.isHighContrastTextEnabled()).isTrue();
+        canvas.setHighContrastTextEnabled(false);
+        assertThat(canvas.isHighContrastTextEnabled()).isFalse();
+    }
+
+    private static final class MockCanvas extends Canvas {
+
+        static class DrawCommand {
             public final String text;
             public final float x;
             public final float y;
+            public final Path path;
+            public final Paint paint;
 
-            DrawCommand(String text, float x, float y) {
+            DrawCommand(String text, float x, float y, Paint paint) {
                 this.text = text;
                 this.x = x;
                 this.y = y;
+                this.paint = paint;
+                path = null;
+            }
+
+            DrawCommand(Path path, Paint paint) {
+                this.path = path;
+                this.paint = paint;
+                y = 0;
+                x = 0;
+                text = null;
             }
         }
 
         List<DrawCommand> mDrawCommands;
 
+        private Boolean mIsHighContrastTextOverride = null;
+
+        public void setHighContrastTextEnabled(boolean enabled) {
+            mIsHighContrastTextOverride = enabled;
+        }
+
+        @Override
+        public boolean isHighContrastTextEnabled() {
+            return mIsHighContrastTextOverride == null ? super.isHighContrastTextEnabled()
+                    : mIsHighContrastTextOverride;
+        }
+
         MockCanvas(int width, int height) {
             super();
             mDrawCommands = new ArrayList<>();
@@ -666,7 +926,7 @@ public class LayoutTest {
 
         @Override
         public void drawText(String text, int start, int end, float x, float y, Paint p) {
-            mDrawCommands.add(new DrawCommand(text.substring(start, end), x, y));
+            mDrawCommands.add(new DrawCommand(text.substring(start, end), x, y, p));
         }
 
         @Override
@@ -676,7 +936,7 @@ public class LayoutTest {
 
         @Override
         public void drawText(char[] text, int index, int count, float x, float y, Paint p) {
-            mDrawCommands.add(new DrawCommand(new String(text, index, count), x, y));
+            mDrawCommands.add(new DrawCommand(new String(text, index, count), x, y, p));
         }
 
         @Override
@@ -691,6 +951,11 @@ public class LayoutTest {
             drawText(text, index, count, x, y, paint);
         }
 
+        @Override
+        public void drawPath(Path path, Paint p) {
+            mDrawCommands.add(new DrawCommand(path, p));
+        }
+
         List<DrawCommand> getDrawCommands() {
             return mDrawCommands;
         }
diff --git a/graphics/java/android/graphics/Canvas.java b/graphics/java/android/graphics/Canvas.java
index f3bb21719890..b6ce9b64323b 100644
--- a/graphics/java/android/graphics/Canvas.java
+++ b/graphics/java/android/graphics/Canvas.java
@@ -153,6 +153,18 @@ public class Canvas extends BaseCanvas {
     }
 
     /**
+     * Indicates whether this Canvas is drawing high contrast text.
+     *
+     * @see android.view.accessibility.AccessibilityManager#isHighTextContrastEnabled()
+     * @return True if high contrast text is enabled, false otherwise.
+     *
+     * @hide
+     */
+    public boolean isHighContrastTextEnabled() {
+        return nIsHighContrastText(mNativeCanvasWrapper);
+    }
+
+    /**
      * Specify a bitmap for the canvas to draw into. All canvas state such as
      * layers, filters, and the save/restore stack are reset. Additionally,
      * the canvas' target density is updated to match that of the bitmap.
@@ -1452,6 +1464,8 @@ public class Canvas extends BaseCanvas {
     @CriticalNative
     private static native boolean nIsOpaque(long canvasHandle);
     @CriticalNative
+    private static native boolean nIsHighContrastText(long canvasHandle);
+    @CriticalNative
     private static native int nGetWidth(long canvasHandle);
     @CriticalNative
     private static native int nGetHeight(long canvasHandle);
diff --git a/libs/hwui/hwui/DrawTextFunctor.h b/libs/hwui/hwui/DrawTextFunctor.h
index 02bf0d8d5e95..1fcb6920db14 100644
--- a/libs/hwui/hwui/DrawTextFunctor.h
+++ b/libs/hwui/hwui/DrawTextFunctor.h
@@ -92,6 +92,7 @@ public:
             // high contrast draw path
             int color = paint.getColor();
             bool darken;
+            // This equation should match the one in core/java/android/text/Layout.java
             if (flags::high_contrast_text_luminance()) {
                 uirenderer::Lab lab = uirenderer::sRGBToLab(color);
                 darken = lab.L <= 50;
diff --git a/libs/hwui/jni/android_graphics_Canvas.cpp b/libs/hwui/jni/android_graphics_Canvas.cpp
index 1fc34d633370..9b63a46822ac 100644
--- a/libs/hwui/jni/android_graphics_Canvas.cpp
+++ b/libs/hwui/jni/android_graphics_Canvas.cpp
@@ -88,6 +88,10 @@ static void setBitmap(JNIEnv* env, jobject, jlong canvasHandle, jlong bitmapHand
     get_canvas(canvasHandle)->setBitmap(bitmap);
 }
 
+static jboolean isHighContrastText(CRITICAL_JNI_PARAMS_COMMA jlong canvasHandle) {
+    return get_canvas(canvasHandle)->isHighContrastText() ? JNI_TRUE : JNI_FALSE;
+}
+
 static jboolean isOpaque(CRITICAL_JNI_PARAMS_COMMA jlong canvasHandle) {
     return get_canvas(canvasHandle)->isOpaque() ? JNI_TRUE : JNI_FALSE;
 }
@@ -792,6 +796,7 @@ static const JNINativeMethod gMethods[] = {
 
         // ------------ @CriticalNative ----------------
         {"nIsOpaque", "(J)Z", (void*)CanvasJNI::isOpaque},
+        {"nIsHighContrastText", "(J)Z", (void*)CanvasJNI::isHighContrastText},
         {"nGetWidth", "(J)I", (void*)CanvasJNI::getWidth},
         {"nGetHeight", "(J)I", (void*)CanvasJNI::getHeight},
         {"nSave", "(JI)I", (void*)CanvasJNI::save},