Expand pixelref to return SkImageInfo and rowbytes

src/lazy/SkLazyCachingPixelRef.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 "Sk64.h"
 #include "SkColorTable.h"
 #include "SkData.h"
 #include "SkImageDecoder.h"
 #include "SkImagePriv.h"
 #include "SkLazyCachingPixelRef.h"
 #include "SkPostConfig.h"
 
-SkLazyCachingPixelRef::SkLazyCachingPixelRef(SkData* data,
+SkLazyCachingPixelRef::SkLazyCachingPixelRef(const SkImageInfo& info,
+                                             SkData* data,
                                              SkBitmapFactory::DecodeProc proc)
-    : fDecodeProc(proc) {
+    : INHERITED(info)
+    , fDecodeProc(proc)
+{
     if (NULL == data) {
         fData = SkData::NewEmpty();
     } else {
         fData = data;
         fData->ref();
     }
     if (NULL == fDecodeProc) {  // use a reasonable default.
         fDecodeProc = SkImageDecoder::DecodeMemoryToTarget;
     }
     this->setImmutable();
 }
 
 SkLazyCachingPixelRef::~SkLazyCachingPixelRef() {
     SkASSERT(fData != NULL);
     fData->unref();
 }
 
-bool SkLazyCachingPixelRef::onDecodeInfo(SkImageInfo* info) {
-    SkASSERT(info);
-    return fDecodeProc(fData->data(), fData->size(), info, NULL);
-}
-
-bool SkLazyCachingPixelRef::onDecodePixels(const SkImageInfo& passedInfo,
-                                           void* pixels, size_t rowBytes) {
+bool SkLazyCachingPixelRef::onDecodePixels(void* pixels, size_t rowBytes) {
     SkASSERT(pixels);
-    SkImageInfo info;
-    if (!this->getInfo(&info)) {
-        return false;
-    }
-    if (passedInfo != info) {
-        return false;  // This implementation can not handle this case.
-    }
-    SkBitmapFactory::Target target = {pixels, rowBytes};
+    SkImageInfo info = this->info();
+    SkBitmapFactory::Target target = { pixels, rowBytes };
     return fDecodeProc(fData->data(), fData->size(), &info, &target);
 }
 
 bool SkLazyCachingPixelRef::Install(SkBitmapFactory::DecodeProc proc,
                                     SkData* data,
                                     SkBitmap* destination) {
+    SkImageInfo info;
+    if (!proc(data->data(), data->size(), &info, NULL)) {
+        return false;
+    }
+
     SkAutoTUnref<SkLazyCachingPixelRef> ref(
-        SkNEW_ARGS(SkLazyCachingPixelRef, (data, proc)));
+        SkNEW_ARGS(SkLazyCachingPixelRef, (info, data, proc)));
     return ref->configure(destination) && destination->setPixelRef(ref);
 }