Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(1945)

Unified Diff: src/lazy/SkPurgeableMemoryBlock.h

Issue 12645006: Create a platform-dependent object for accessing purgeable memory. (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: Build mac version on iOS as well. Created 7 years, 9 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View side-by-side diff with in-line comments
Download patch
« no previous file with comments | « gyp/ports.gyp ('k') | src/lazy/SkPurgeableMemoryBlock_common.cpp » ('j') | no next file with comments »
Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
Index: src/lazy/SkPurgeableMemoryBlock.h
diff --git a/src/lazy/SkPurgeableMemoryBlock.h b/src/lazy/SkPurgeableMemoryBlock.h
new file mode 100644
index 0000000000000000000000000000000000000000..1750ad9d6cd59029aca960dcb92282c9f7ae8393
--- /dev/null
+++ b/src/lazy/SkPurgeableMemoryBlock.h
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPurgeableMemoryBlock_DEFINED
+#define SkPurgeableMemoryBlock_DEFINED
+
+#include "SkTypes.h"
+
+class SkPurgeableMemoryBlock : public SkNoncopyable {
+
+public:
+ /**
+ * Whether or not this platform has an implementation for purgeable memory.
+ */
+ static bool IsSupported();
+
+ /**
+ * Create a new purgeable memory block of 'size' bytes. Returns NULL if not supported on this
+ * platform or on failure.
+ * @param size Number of bytes requested.
+ * @return A new block, or NULL on failure.
+ */
+ static SkPurgeableMemoryBlock* Create(size_t size);
+
+#ifdef SK_DEBUG
+ /**
+ * Whether the platform supports one shot purge of all unpinned blocks. If so,
+ * PurgeAllUnpinnedBlocks will be used to test a purge. Otherwise, purge will be called on
+ * individual blocks.
+ */
+ static bool PlatformSupportsPurgingAllUnpinnedBlocks();
+
+ /**
+ * Purge all unpinned blocks at once, if the platform supports it.
+ */
+ static bool PurgeAllUnpinnedBlocks();
+
+ // If PlatformSupportsPurgingAllUnpinnedBlocks returns true, this will not be called, so it can
+ // simply return false.
+ bool purge();
+
+ bool isPinned() const { return fPinned; }
+#endif
+
+ ~SkPurgeableMemoryBlock();
+
+ /**
+ * Output parameter for pin(), stating whether the data has been retained.
+ */
+ enum PinResult {
+ /**
+ * The data has been purged, or this is the first call to pin.
+ */
+ kUninitialized_PinResult,
+
+ /**
+ * The data has been retained. The memory contains the same data it held when unpin() was
+ * called.
+ */
+ kRetained_PinResult,
+ };
+
+ /**
+ * Pin the memory for use. Must not be called while already pinned.
+ * @param PinResult Whether the data was retained. Ignored on failure.
+ * @return Pointer to the pinned data on success. NULL on failure.
+ */
+ void* pin(PinResult*);
+
+ /**
+ * Unpin the data so it can be purged if necessary.
+ */
+ void unpin();
+
+private:
+ void* fAddr;
+ size_t fSize;
+ bool fPinned;
+#ifdef SK_BUILD_FOR_ANDROID
+ int fFD;
+#endif
+
+ // Unimplemented default constructor is private, to prevent manual creation.
+ SkPurgeableMemoryBlock();
+
+ // The correct way to create a new one is from the static Create.
+ SkPurgeableMemoryBlock(size_t);
+};
+
+#endif // SkPurgeableMemoryBlock_DEFINED
« no previous file with comments | « gyp/ports.gyp ('k') | src/lazy/SkPurgeableMemoryBlock_common.cpp » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698