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Unified Diff: src/utils/SkBitmapRegionDecoder.cpp

Issue 1288963002: Provides multiple implementations of Android's SkBitmapRegionDecoder (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Response to comments Created 5 years, 3 months ago
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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;
+ }
+}

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