Update all callsites to use info for pixelrefs

#define SK_SUPPORT_LEGACY_PIXELREF_CONSTRUCTOR in chrome to keep old API signature (for now)

BUG=
R=scroggo@google.com

Review URL: https://codereview.chromium.org/100723005

git-svn-id: http://skia.googlecode.com/svn/trunk@12677 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/lazy/SkCachingPixelRef.cpp b/src/lazy/SkCachingPixelRef.cpp
index b7eaf57..668f57e 100644
--- a/src/lazy/SkCachingPixelRef.cpp
+++ b/src/lazy/SkCachingPixelRef.cpp
@@ -21,20 +21,18 @@
         return false;
     }
     SkAutoTUnref<SkCachingPixelRef> ref(SkNEW_ARGS(SkCachingPixelRef,
-                                                   (generator,
-                                                    info,
-                                                    dst->rowBytes())));
+                                           (info, generator, dst->rowBytes())));
     dst->setPixelRef(ref);
     return true;
 }
 
-SkCachingPixelRef::SkCachingPixelRef(SkImageGenerator* generator,
-                                     const SkImageInfo& info,
+SkCachingPixelRef::SkCachingPixelRef(const SkImageInfo& info,
+                                     SkImageGenerator* generator,
                                      size_t rowBytes)
-    : fImageGenerator(generator)
+    : INHERITED(info)
+    , fImageGenerator(generator)
     , fErrorInDecoding(false)
     , fScaledCacheId(NULL)
-    , fInfo(info)
     , fRowBytes(rowBytes) {
     SkASSERT(fImageGenerator != NULL);
 }
@@ -44,31 +42,32 @@
     // Assert always unlock before unref.
 }
 
-void* SkCachingPixelRef::onLockPixels(SkColorTable** colorTable) {
-    (void)colorTable;
+void* SkCachingPixelRef::onLockPixels(SkColorTable**) {
+    const SkImageInfo& info = this->info();
+
     if (fErrorInDecoding) {
         return NULL;  // don't try again.
     }
     SkBitmap bitmap;
     SkASSERT(NULL == fScaledCacheId);
     fScaledCacheId = SkScaledImageCache::FindAndLock(this->getGenerationID(),
-                                                     fInfo.fWidth,
-                                                     fInfo.fHeight,
+                                                     info.fWidth,
+                                                     info.fHeight,
                                                      &bitmap);
     if (NULL == fScaledCacheId) {
         // Cache has been purged, must re-decode.
-        if ((!bitmap.setConfig(fInfo, fRowBytes)) || !bitmap.allocPixels()) {
+        if ((!bitmap.setConfig(info, fRowBytes)) || !bitmap.allocPixels()) {
             fErrorInDecoding = true;
             return NULL;
         }
         SkAutoLockPixels autoLockPixels(bitmap);
-        if (!fImageGenerator->getPixels(fInfo, bitmap.getPixels(), fRowBytes)) {
+        if (!fImageGenerator->getPixels(info, bitmap.getPixels(), fRowBytes)) {
             fErrorInDecoding = true;
             return NULL;
         }
         fScaledCacheId = SkScaledImageCache::AddAndLock(this->getGenerationID(),
-                                                        fInfo.fWidth,
-                                                        fInfo.fHeight,
+                                                        info.fWidth,
+                                                        info.fHeight,
                                                         bitmap);
         SkASSERT(fScaledCacheId != NULL);
     }
diff --git a/src/lazy/SkCachingPixelRef.h b/src/lazy/SkCachingPixelRef.h
index 4a0387d..b1f2fcd 100644
--- a/src/lazy/SkCachingPixelRef.h
+++ b/src/lazy/SkCachingPixelRef.h
@@ -58,12 +58,10 @@
     SkImageGenerator* const fImageGenerator;
     bool                    fErrorInDecoding;
     void*                   fScaledCacheId;
-    const SkImageInfo       fInfo;
     const size_t            fRowBytes;
 
-    SkCachingPixelRef(SkImageGenerator* imageGenerator,
-                      const SkImageInfo& info,
-                      size_t rowBytes);
+    SkCachingPixelRef(const SkImageInfo&, SkImageGenerator*, size_t rowBytes);
+
     typedef SkPixelRef INHERITED;
 };
 
diff --git a/src/lazy/SkDiscardablePixelRef.cpp b/src/lazy/SkDiscardablePixelRef.cpp
index f551436..160ca5b 100644
--- a/src/lazy/SkDiscardablePixelRef.cpp
+++ b/src/lazy/SkDiscardablePixelRef.cpp
@@ -9,19 +9,17 @@
 #include "SkDiscardableMemory.h"
 #include "SkImageGenerator.h"
 
-SkDiscardablePixelRef::SkDiscardablePixelRef(SkImageGenerator* generator,
-                                             const SkImageInfo& info,
-                                             size_t size,
+SkDiscardablePixelRef::SkDiscardablePixelRef(const SkImageInfo& info,
+                                             SkImageGenerator* generator,
                                              size_t rowBytes,
                                              SkDiscardableMemory::Factory* fact)
-    : fGenerator(generator)
+    : INHERITED(info)
+    , fGenerator(generator)
     , fDMFactory(fact)
-    , fInfo(info)
-    , fSize(size)
     , fRowBytes(rowBytes)
-    , fDiscardableMemory(NULL) {
+    , fDiscardableMemory(NULL)
+{
     SkASSERT(fGenerator != NULL);
-    SkASSERT(fSize > 0);
     SkASSERT(fRowBytes > 0);
     // The SkImageGenerator contract requires fGenerator to always
     // decode the same image on each call to getPixels().
@@ -46,16 +44,19 @@
         SkDELETE(fDiscardableMemory);
         fDiscardableMemory = NULL;
     }
+
+    const size_t size = this->info().getSafeSize(fRowBytes);
+
     if (fDMFactory != NULL) {
-        fDiscardableMemory = fDMFactory->create(fSize);
+        fDiscardableMemory = fDMFactory->create(size);
     } else {
-        fDiscardableMemory = SkDiscardableMemory::Create(fSize);
+        fDiscardableMemory = SkDiscardableMemory::Create(size);
     }
     if (NULL == fDiscardableMemory) {
         return NULL;  // Memory allocation failed.
     }
     void* pixels = fDiscardableMemory->data();
-    if (!fGenerator->getPixels(fInfo, pixels, fRowBytes)) {
+    if (!fGenerator->getPixels(this->info(), pixels, fRowBytes)) {
         fDiscardableMemory->unlock();
         SkDELETE(fDiscardableMemory);
         fDiscardableMemory = NULL;
@@ -84,10 +85,7 @@
         return dst->allocPixels(NULL, NULL);
     }
     SkAutoTUnref<SkDiscardablePixelRef> ref(SkNEW_ARGS(SkDiscardablePixelRef,
-                                                   (generator, info,
-                                                    dst->getSize(),
-                                                    dst->rowBytes(),
-                                                    factory)));
+                               (info, generator, dst->rowBytes(), factory)));
     dst->setPixelRef(ref);
     return true;
 }
diff --git a/src/lazy/SkDiscardablePixelRef.h b/src/lazy/SkDiscardablePixelRef.h
index 44c6df9..4b66938 100644
--- a/src/lazy/SkDiscardablePixelRef.h
+++ b/src/lazy/SkDiscardablePixelRef.h
@@ -30,8 +30,6 @@
 private:
     SkImageGenerator* const fGenerator;
     SkDiscardableMemory::Factory* const fDMFactory;
-    const SkImageInfo fInfo;
-    const size_t fSize;  // size of memory to be allocated
     const size_t fRowBytes;
     // These const members should not change over the life of the
     // PixelRef, since the SkBitmap doesn't expect them to change.
@@ -39,9 +37,7 @@
     SkDiscardableMemory* fDiscardableMemory;
 
     /* Takes ownership of SkImageGenerator. */
-    SkDiscardablePixelRef(SkImageGenerator* generator,
-                          const SkImageInfo& info,
-                          size_t size,
+    SkDiscardablePixelRef(const SkImageInfo&, SkImageGenerator*,
                           size_t rowBytes,
                           SkDiscardableMemory::Factory* factory);
     friend bool SkInstallDiscardablePixelRef(SkImageGenerator*,