Add onNewLockPixels, that returns rowbytes and relies on info in pixelref

src/lazy/SkDiscardablePixelRef.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDiscardablePixelRef.h"
 #include "SkDiscardableMemory.h"
 #include "SkImageGenerator.h"
@@ skipping 18 matching lines @@
 
 SkDiscardablePixelRef::~SkDiscardablePixelRef() {
     if (this->isLocked()) {
         fDiscardableMemory->unlock();
     }
     SkDELETE(fDiscardableMemory);
     SkSafeUnref(fDMFactory);
     SkDELETE(fGenerator);
 }
 
-void* SkDiscardablePixelRef::onLockPixels(SkColorTable**) {
+bool SkDiscardablePixelRef::onNewLockPixels(LockRec* rec) {
     if (fDiscardableMemory != NULL) {
         if (fDiscardableMemory->lock()) {
-            return fDiscardableMemory->data();
+            rec->fPixels = fDiscardableMemory->data();
+            rec->fColorTable = NULL;
+            rec->fRowBytes = fRowBytes;
+            return true;
         }
         SkDELETE(fDiscardableMemory);
         fDiscardableMemory = NULL;
     }
-
+    
     const size_t size = this->info().getSafeSize(fRowBytes);
 
     if (fDMFactory != NULL) {
         fDiscardableMemory = fDMFactory->create(size);
     } else {
         fDiscardableMemory = SkDiscardableMemory::Create(size);
     }
     if (NULL == fDiscardableMemory) {
-        return NULL;  // Memory allocation failed.
+        return false;  // Memory allocation failed.
     }
+
     void* pixels = fDiscardableMemory->data();
     if (!fGenerator->getPixels(this->info(), pixels, fRowBytes)) {
         fDiscardableMemory->unlock();
         SkDELETE(fDiscardableMemory);
         fDiscardableMemory = NULL;
-        return NULL;
+        return false;
     }
-    return pixels;
+
+    rec->fPixels = pixels;
+    rec->fColorTable = NULL;
+    rec->fRowBytes = fRowBytes;
+    return true;
 }
+
 void SkDiscardablePixelRef::onUnlockPixels() {
     fDiscardableMemory->unlock();
 }
 
 bool SkInstallDiscardablePixelRef(SkImageGenerator* generator,
                                   SkBitmap* dst,
                                   SkDiscardableMemory::Factory* factory) {
     SkImageInfo info;
     SkAutoTDelete<SkImageGenerator> autoGenerator(generator);
     if ((NULL == autoGenerator.get())
         || (!autoGenerator->getInfo(&info))
         || (!dst->setConfig(info, 0))) {
         return false;
     }
     SkASSERT(dst->config() != SkBitmap::kNo_Config);
     if (dst->empty()) {  // Use a normal pixelref.
         return dst->allocPixels(NULL, NULL);
     }
     SkAutoTUnref<SkDiscardablePixelRef> ref(
         SkNEW_ARGS(SkDiscardablePixelRef,
                    (info, autoGenerator.detach(), dst->rowBytes(), factory)));
     dst->setPixelRef(ref);
     return true;
 }