Index: src/utils/SkBitmapRegionDecoder.cpp |
diff --git a/src/utils/SkBitmapRegionDecoder.cpp b/src/utils/SkBitmapRegionDecoder.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..3f814b3a5d7486151916a086e74cff91989c85a3 |
--- /dev/null |
+++ b/src/utils/SkBitmapRegionDecoder.cpp |
@@ -0,0 +1,51 @@ |
+/* |
+ * 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"); |
+ delete decoder; |
+ return nullptr; |
+ } |
+ return new SkBitmapRegionSampler(decoder, width, height); |
+ } |
+ case kCanvas_Strategy: { |
+ SkScanlineDecoder* decoder = SkScanlineDecoder::NewFromStream(stream); |
+ if (nullptr == decoder) { |
+ SkDebugf("Error: Failed to create decoder.\n"); |
+ return nullptr; |
+ } |
+ switch (decoder->getScanlineOrder()) { |
+ case SkScanlineDecoder::kTopDown_SkScanlineOrder: |
+ case SkScanlineDecoder::kNone_SkScanlineOrder: |
+ break; |
+ default: |
+ SkDebugf("Error: Scanline ordering not supported.\n"); |
+ return nullptr; |
+ } |
+ return new SkBitmapRegionCanvas(decoder); |
+ } |
+ default: |
+ SkASSERT(false); |
+ return nullptr; |
+ } |
+} |