SkLiteDL: drawAsLayer()

This more or less the API you were thinking?

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2315283002

Review-Url: https://codereview.chromium.org/2315283002

2 files changed, 20 insertions, 0 deletions

diff --git a/src/core/SkLiteDL.cpp b/src/core/SkLiteDL.cpp
index 8c8abb1cc3..227c2f30b6 100644
--- a/src/core/SkLiteDL.cpp
+++ b/src/core/SkLiteDL.cpp
@@ -816,3 +816,16 @@ void SkLiteDL::reset(SkRect bounds) {
     fUsed   = 0;
     fBounds = bounds;
 }
+
+void SkLiteDL::drawAsLayer(SkCanvas* canvas, const SkMatrix* matrix, const SkPaint* paint) {
+    auto fallback_plan = [&] {
+        SkRect bounds = this->getBounds();
+        canvas->saveLayer(&bounds, paint);
+            this->draw(canvas, matrix);
+        canvas->restore();
+    };
+
+    // TODO: single-draw specializations
+
+    return fallback_plan();
+}
diff --git a/src/core/SkLiteDL.h b/src/core/SkLiteDL.h
index 9dd1568ddf..8edd700e85 100644
--- a/src/core/SkLiteDL.h
+++ b/src/core/SkLiteDL.h
@@ -27,6 +27,13 @@ public:
     void setDrawFilter(SkDrawFilter*);
 #endif
 
+    // Draws as if...
+    //   SkRect bounds = this->getBounds();
+    //   canvas->saveLayer(&bounds, paint);
+    //       this->draw(canvas, matrix);
+    //   canvas->restore();
+    void drawAsLayer(SkCanvas*, const SkMatrix*, const SkPaint*);
+
     void save();
     void saveLayer(const SkRect*, const SkPaint*, const SkImageFilter*, SkCanvas::SaveLayerFlags);
     void restore();