Proposed SkCanvas API for preLoading textures to VRAM v2.0

tools/PictureRenderer.cpp

Index: tools/PictureRenderer.cpp
===================================================================
--- tools/PictureRenderer.cpp	(revision 13812)
+++ tools/PictureRenderer.cpp	(working copy)
@@ -570,20 +570,19 @@
 }
 
 /**
- * Draw the specified playback to the canvas translated to rectangle provided, so that this mini
+ * Draw the specified picture to the canvas translated to rectangle provided, so that this mini
  * canvas represents the rectangle's portion of the overall picture.
  * Saves and restores so that the initial clip and matrix return to their state before this function
  * is called.
  */
-template<class T>
-static void DrawTileToCanvas(SkCanvas* canvas, const SkRect& tileRect, T* playback) {
+static void draw_tile_to_canvas(SkCanvas* canvas, const SkRect& tileRect, SkPicture* picture) {
     int saveCount = canvas->save();
     // Translate so that we draw the correct portion of the picture.
     // Perform a postTranslate so that the scaleFactor does not interfere with the positioning.
     SkMatrix mat(canvas->getTotalMatrix());
     mat.postTranslate(-tileRect.fLeft, -tileRect.fTop);
     canvas->setMatrix(mat);
-    playback->draw(canvas);
+    canvas->drawPicture(*picture);
     canvas->restoreToCount(saveCount);
     canvas->flush();
 }
@@ -621,7 +620,7 @@
 
 void TiledPictureRenderer::drawCurrentTile() {
     SkASSERT(fCurrentTileOffset >= 0 && fCurrentTileOffset < fTileRects.count());
-    DrawTileToCanvas(fCanvas, fTileRects[fCurrentTileOffset], fPicture);
+    draw_tile_to_canvas(fCanvas, fTileRects[fCurrentTileOffset], fPicture);
 }
 
 bool TiledPictureRenderer::render(const SkString* path, SkBitmap** out) {
@@ -638,7 +637,7 @@
     }
     bool success = true;
     for (int i = 0; i < fTileRects.count(); ++i) {
-        DrawTileToCanvas(fCanvas, fTileRects[i], fPicture);
+        draw_tile_to_canvas(fCanvas, fTileRects[i], fPicture);
         if (NULL != path) {
             success &= writeAppendNumber(fCanvas, path, i, fJsonSummaryPtr);
         }
@@ -722,7 +721,7 @@
         }
 
         for (int i = fStart; i < fEnd; i++) {
-            DrawTileToCanvas(fCanvas, fRects[i], fClone);
+            draw_tile_to_canvas(fCanvas, fRects[i], fClone);
             if ((fPath != NULL) && !writeAppendNumber(fCanvas, fPath, i, fJsonSummaryPtr)
                 && fSuccess != NULL) {
                 *fSuccess = false;