SkVarAlloc

src/core/SkVarAlloc.h

+#ifndef SkVarAlloc_DEFINED
+#define SkVarAlloc_DEFINED
+
+#include "SkTypes.h"
+
+class SkVarAlloc : SkNoncopyable {
+public:
+    // SkVarAlloc will never allocate less than smallest bytes at a time.
+    // When it allocates a new block, it will be at least growth times bigger than the last.
+    SkVarAlloc(size_t smallest, float growth);
+    ~SkVarAlloc();
+
+    // Returns contiguous bytes aligned at least for pointers.  You may pass SK_MALLOC_THROW, etc.
+    char* alloc(size_t bytes, unsigned sk_malloc_flags) {
+        bytes = SkAlignPtr(bytes);
+
+        if (fByte + bytes > fLimit) {
+            this->makeSpace(bytes, sk_malloc_flags);
+        }
+        SkASSERT(fByte + bytes <= fLimit);
+
+        char* ptr = fByte;
+        fByte += bytes;
+        return ptr;
+    }
+
+private:
+    void makeSpace(size_t bytes, unsigned flags);
+
+    char* fByte;
+    const char* fLimit;
+
+    unsigned fSmallest;
+    const float fGrowth;
+
+    struct Block;
+    Block* fBlock;
+};
+
+#endif//SkVarAlloc_DEFINED