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(const SkImageInfo& info,

[scroggo, 2013/12/06 14:50:33]

Deleted by Hal?

+                                             SkData* data,
+                                             SkBitmapFactory::DecodeProc 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::onDecodePixels(void* pixels, size_t rowBytes) {
+    SkASSERT(pixels);
+    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, (info, data, proc)));
+    return ref->configure(destination) && destination->setPixelRef(ref);
+}