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

src/lazy/SkCachingPixelRef.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 "SkCachingPixelRef.h"
 #include "SkScaledImageCache.h"
 
-
 bool SkCachingPixelRef::Install(SkImageGenerator* generator,
                                 SkBitmap* dst) {
     SkImageInfo info;
     SkASSERT(dst != NULL);
     if ((NULL == generator)
         || !(generator->getInfo(&info))
         || !dst->setConfig(info, 0)) {
         SkDELETE(generator);
         return false;
     }
@@ skipping 12 matching lines @@
     , fScaledCacheId(NULL)
     , fRowBytes(rowBytes) {
     SkASSERT(fImageGenerator != NULL);
 }
 SkCachingPixelRef::~SkCachingPixelRef() {
     SkDELETE(fImageGenerator);
     SkASSERT(NULL == fScaledCacheId);
     // Assert always unlock before unref.
 }
 
-void* SkCachingPixelRef::onLockPixels(SkColorTable**) {
+bool SkCachingPixelRef::onNewLockPixels(LockRec* rec) {
+    if (fErrorInDecoding) {
+        return false;  // don't try again.
+    }
+    
     const SkImageInfo& info = this->info();
-
-    if (fErrorInDecoding) {
-        return NULL;  // don't try again.
-    }
     SkBitmap bitmap;
     SkASSERT(NULL == fScaledCacheId);
     fScaledCacheId = SkScaledImageCache::FindAndLock(this->getGenerationID(),
                                                      info.fWidth,
                                                      info.fHeight,
                                                      &bitmap);
     if (NULL == fScaledCacheId) {
         // Cache has been purged, must re-decode.
         if ((!bitmap.setConfig(info, fRowBytes)) || !bitmap.allocPixels()) {
             fErrorInDecoding = true;
-            return NULL;
+            return false;
         }
         SkAutoLockPixels autoLockPixels(bitmap);
         if (!fImageGenerator->getPixels(info, bitmap.getPixels(), fRowBytes)) {
             fErrorInDecoding = true;
-            return NULL;
+            return false;
         }
         fScaledCacheId = SkScaledImageCache::AddAndLock(this->getGenerationID(),
                                                         info.fWidth,
                                                         info.fHeight,
                                                         bitmap);
         SkASSERT(fScaledCacheId != NULL);
     }
 
     // Now bitmap should contain a concrete PixelRef of the decoded
     // image.
     SkAutoLockPixels autoLockPixels(bitmap);
     void* pixels = bitmap.getPixels();
     SkASSERT(pixels != NULL);
+    
     // At this point, the autoLockPixels will unlockPixels()
     // to remove bitmap's lock on the pixels.  We will then
     // destroy bitmap.  The *only* guarantee that this pointer
     // remains valid is the guarantee made by
     // SkScaledImageCache that it will not destroy the *other*
     // bitmap (SkScaledImageCache::Rec.fBitmap) that holds a
     // reference to the concrete PixelRef while this record is
     // locked.
-    return pixels;
+    rec->fPixels = pixels;
+    rec->fColorTable = NULL;
+    rec->fRowBytes = bitmap.rowBytes();
+    return true;
 }
 
 void SkCachingPixelRef::onUnlockPixels() {
     SkASSERT(fScaledCacheId != NULL);
     SkScaledImageCache::Unlock( static_cast<SkScaledImageCache::ID*>(fScaledCacheId));
     fScaledCacheId = NULL;
 }