Expand pixelref to return SkImageInfo and rowbytes

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"
 
 SkCachingPixelRef::SkCachingPixelRef()
     : fErrorInDecoding(false)
     , fScaledCacheId(NULL) {
     memset(&fInfo, 0xFF, sizeof(fInfo));
 }
 SkCachingPixelRef::~SkCachingPixelRef() {
     SkASSERT(NULL == fScaledCacheId);
     // Assert always unlock before unref.
 }
 
-bool SkCachingPixelRef::getInfo(SkImageInfo* info) {
+bool SkCachingPixelRef::onGetInfo(SkImageInfo* info) {
     SkASSERT(info != NULL);
     if (fErrorInDecoding) {
         return false;  // Don't try again.
     }
     if (fInfo.fWidth < 0) {
         SkImageInfo tmp;
         if (!this->onDecodeInfo(&tmp)) {
             fErrorInDecoding = true;
             return false;
         }
         SkASSERT(tmp.fWidth >= 0);
         fInfo = tmp;
     }
     *info = fInfo;
     return true;
 }
 
-bool SkCachingPixelRef::configure(SkBitmap* bitmap) {
-    SkASSERT(bitmap != NULL);
+bool SkCachingPixelRef::onNewLockPixels(LockRec* rec) {
     SkImageInfo info;
     if (!this->getInfo(&info)) {
         return false;
     }
-    return bitmap->setConfig(info, 0);
-}
-
-void* SkCachingPixelRef::onLockPixels(SkColorTable** colorTable) {
-    (void)colorTable;
-    SkImageInfo info;
-    if (!this->getInfo(&info)) {
-        return NULL;
-    }
     SkBitmap bitmap;
 
     fScaledCacheId = SkScaledImageCache::FindAndLock(this->getGenerationID(),
                                                      info.fWidth,
                                                      info.fHeight,
                                                      &bitmap);
     if (NULL == fScaledCacheId) {
         // Cache has been purged, must re-decode.
         if (!this->onDecodeInto(0, &bitmap)) {
-            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() {
     if (fScaledCacheId != NULL) {
         SkScaledImageCache::Unlock(
             static_cast<SkScaledImageCache::ID*>(fScaledCacheId));
         fScaledCacheId = NULL;
     }
 }
 
 bool SkCachingPixelRef::onDecodeInto(int pow2, SkBitmap* bitmap) {
     SkASSERT(bitmap != NULL);
     SkBitmap tmp;
     SkImageInfo info;
     // TODO(halcanary) - Enable SkCachingPixelRef to use a custom
     // allocator. `tmp.allocPixels(fAllocator, NULL)`
     if (!(this->configure(&tmp) && tmp.allocPixels())) {
         return false;
     }
     SkAssertResult(this->getInfo(&info));  // since configure() succeeded.
     if (!this->onDecodePixels(info, tmp.getPixels(), tmp.rowBytes())) {
         fErrorInDecoding = true;
         return false;
     }
     *bitmap = tmp;
     return true;
 }