SkLiteDL: drawAsLayer()

src/core/SkLiteDL.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
+#include "SkColorFilter.h"
 #include "SkData.h"
 #include "SkDrawFilter.h"
 #include "SkImageFilter.h"
 #include "SkLiteDL.h"
 #include "SkMath.h"
 #include "SkPicture.h"
 #include "SkRSXform.h"
 #include "SkTextBlob.h"
+#include "SkXfermode.h"
 
 #ifndef SKLITEDL_PAGE
     #define SKLITEDL_PAGE 4096
 #endif
 
 // A stand-in for an optional SkRect which was not set, e.g. bounds for a saveLayer().
 static const SkRect kUnset = { SK_ScalarInfinity, 0,0,0};
 static const SkRect* maybe_unset(const SkRect& r) {
     return r.left() == SK_ScalarInfinity ? nullptr : &r;
 }
@@ skipping 782 matching lines @@
 }
 
 void SkLiteDL::reset(SkRect bounds) {
     SkASSERT(this->unique());
     this->map(dtor_fns);
 
     // Leave fBytes and fReserved alone.
     fUsed   = 0;
     fBounds = bounds;
 }
+
+void SkLiteDL::drawAsLayer(SkCanvas* c, const SkMatrix* matrix
+                                      , SkColorFilter* cf
+                                      , SkXfermode* xfer
+                                      , U8CPU alpha) {
+    auto fallback_plan = [&] {

[reed1, 2016/09/07 15:29:55]

cool way to construct this.

+        SkPaint p;
+        p.setColorFilter(sk_ref_sp(cf));
+        p.setXfermode(sk_ref_sp(xfer));
+        p.setAlpha(alpha);
+        SkRect bounds = this->getBounds();
+        c->saveLayer(&bounds, &p);
+            this->draw(c, matrix);
+        c->restore();
+    };
+
+    // TODO: single-draw specializations
+
+    return fallback_plan();
+}