Provides multiple implementations of Android's SkBitmapRegionDecoder

src/utils/SkBitmapRegionDecoder.cpp

Index: src/utils/SkBitmapRegionDecoder.cpp
diff --git a/src/utils/SkBitmapRegionDecoder.cpp b/src/utils/SkBitmapRegionDecoder.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..2a93cd2508836885b3879bb278b9b70f4a7a0354
--- /dev/null
+++ b/src/utils/SkBitmapRegionDecoder.cpp
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkBitmapRegionCanvas.h"
+#include "SkBitmapRegionDecoder.h"
+#include "SkBitmapRegionSampler.h"
+#include "SkScanlineDecoder.h"
+#include "SkImageDecoder.h"
+
+SkBitmapRegionDecoder* SkBitmapRegionDecoder::CreateBitmapRegionDecoder(
+        SkStreamRewindable* stream, Strategy strategy) {
+    switch (strategy) {
+        case kOriginal_Strategy: {
+            SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
+            int width, height;
+            if (nullptr == decoder) {
+                SkDebugf("Error: Could not create image decoder.\n");
+                return nullptr;
+            }
+            if (!decoder->buildTileIndex(stream, &width, &height)) {
+                SkDebugf("Error: Could not build tile index.\n");
+                SkDELETE(decoder);

[scroggo, 2015/09/02 21:32:24]

nit: delete

[msarett, 2015/09/03 19:20:52]

Done.

+                return nullptr;
+            }
+            return SkNEW_ARGS(SkBitmapRegionSampler, (decoder, width, height));

[scroggo, 2015/09/02 21:32:24]

nit: new

[msarett, 2015/09/03 19:20:52]

Done.

+        }
+        case kCanvas_Strategy: {
+            SkScanlineDecoder* decoder = SkScanlineDecoder::NewFromStream(stream);
+            if (nullptr == decoder) {
+                SkDebugf("Error: Failed to create decoder.\n");
+                return nullptr;
+            }
+            return SkNEW_ARGS(SkBitmapRegionCanvas, (decoder));

[scroggo, 2015/09/02 21:32:24]

nit: new

[msarett, 2015/09/03 19:20:52]

Done.

+        }
+        default:
+            SkASSERT(false);
+            return nullptr;
+    }
+}