Fix bug on High Contrast Text : where DarkTheme is enabled &&

ForceDarkAllowed is true.

In this condition, text seems be bold so far.
From now, in this case, text would have black outline, white inline
color.

this is related to
https://partnerissuetracker.corp.google.com/u/1/issues/175363190.

Test: Repro steps in bug; make
Bug: 175363190

Change-Id: Icf0048ef8d55c2e29676944c24c2050f531616d5

libs/hwui/RecordingCanvas.cpp

@@ -384,10 +384,11 @@ struct DrawImageLattice final : Op {
 struct DrawTextBlob final : Op {
     static const auto kType = Type::DrawTextBlob;
     DrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y, const SkPaint& paint)
-            : blob(sk_ref_sp(blob)), x(x), y(y), paint(paint) {}
+        : blob(sk_ref_sp(blob)), x(x), y(y), paint(paint), drawTextBlobMode(gDrawTextBlobMode) {}
     sk_sp<const SkTextBlob> blob;
     SkScalar x, y;
     SkPaint paint;
+    DrawTextBlobMode drawTextBlobMode;
     void draw(SkCanvas* c, const SkMatrix&) const { c->drawTextBlob(blob.get(), x, y, paint); }
 };
 
@@ -832,6 +833,24 @@ constexpr color_transform_fn colorTransformForOp() {
     }
 }
 
+template<>
+constexpr color_transform_fn colorTransformForOp<DrawTextBlob>() {
+    return [](const void *opRaw, ColorTransform transform) {
+        const DrawTextBlob *op = reinterpret_cast<const DrawTextBlob*>(opRaw);
+        switch (op->drawTextBlobMode) {
+        case DrawTextBlobMode::HctOutline:
+            const_cast<SkPaint&>(op->paint).setColor(SK_ColorBLACK);
+            break;
+        case DrawTextBlobMode::HctInner:
+            const_cast<SkPaint&>(op->paint).setColor(SK_ColorWHITE);
+            break;
+        default:
+            transformPaint(transform, const_cast<SkPaint*>(&(op->paint)));
+            break;
+        }
+    };
+}
+
 #define X(T) colorTransformForOp<T>(),
 static const color_transform_fn color_transform_fns[] = {
 #include "DisplayListOps.in"

libs/hwui/hwui/Canvas.cpp

@@ -110,16 +110,19 @@ public:
             bool darken = channelSum < (128 * 3);
 
             // outline
+            gDrawTextBlobMode = DrawTextBlobMode::HctOutline;
             Paint outlinePaint(paint);
             simplifyPaint(darken ? SK_ColorWHITE : SK_ColorBLACK, &outlinePaint);
             outlinePaint.setStyle(SkPaint::kStrokeAndFill_Style);
             canvas->drawGlyphs(glyphFunc, glyphCount, outlinePaint, x, y, totalAdvance);
 
             // inner
+            gDrawTextBlobMode = DrawTextBlobMode::HctInner;
             Paint innerPaint(paint);
             simplifyPaint(darken ? SK_ColorBLACK : SK_ColorWHITE, &innerPaint);
             innerPaint.setStyle(SkPaint::kFill_Style);
             canvas->drawGlyphs(glyphFunc, glyphCount, innerPaint, x, y, totalAdvance);
+            gDrawTextBlobMode = DrawTextBlobMode::Normal;
         } else {
             // standard draw path
             canvas->drawGlyphs(glyphFunc, glyphCount, paint, x, y, totalAdvance);

libs/hwui/hwui/Canvas.h

@@ -61,6 +61,14 @@ class Bitmap;
 class Paint;
 struct Typeface;
 
+enum class DrawTextBlobMode {
+    Normal,
+    HctOutline,
+    HctInner,
+};
+
+inline DrawTextBlobMode gDrawTextBlobMode = DrawTextBlobMode::Normal;
+
 class ANDROID_API Canvas {
 public:
     virtual ~Canvas(){};