Proposed SkCanvas API for preLoading textures to VRAM

src/core/SkPicturePlayback.cpp

Index: src/core/SkPicturePlayback.cpp
===================================================================
--- src/core/SkPicturePlayback.cpp	(revision 13719)
+++ src/core/SkPicturePlayback.cpp	(working copy)
@@ -725,7 +725,7 @@
 // The activeOps parameter is actually "const SkTDArray<SkPictureStateTree::Draw*>&".
 // It represents the operations about to be drawn, as generated by some spatial
 // subdivision helper class. It should already be in 'fOffset' sorted order.
-void SkPicturePlayback::preLoadBitmaps(const SkTDArray<void*>& activeOps) {
+void SkPicturePlayback::preLoadBitmaps(SkCanvas& canvas, const SkTDArray<void*>& activeOps) {
     if (0 == activeOps.count() || NULL == fBitmapUseOffsets) {
         return;
     }
@@ -762,7 +762,8 @@
     }
 
     for (int i = 0; i < active.count(); ++i) {
-        SkDebugf("preload texture %d\n", active[i]);
+        SkASSERT(SkBitmapHeap::INVALID_SLOT != active[i]);
+        canvas.internalPrivate_PreLoad((*fBitmaps)[active[i]], SkIRect::MakeWH(0, 0));
     }
 }
 
@@ -815,7 +816,7 @@
         reader.setOffset(skipTo);
     }
 
-    this->preLoadBitmaps(activeOps);
+    this->preLoadBitmaps(canvas, activeOps);
 
     // Record this, so we can concat w/ it if we encounter a setMatrix()
     SkMatrix initialMatrix = canvas.getTotalMatrix();