XPS ttc handling.

include/core/SkTemplates.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkTemplates_DEFINED
@@ skipping 28 matching lines @@
 ///@{
 /** SkTConstType<T, CONST>::type will be 'const T' if CONST is true, 'T' otherwise. */
 template <typename T, bool CONST> struct SkTConstType {
     typedef T type;
 };
 template <typename T> struct SkTConstType<T, true> {
     typedef const T type;
 };
 ///@}
 
+/**
+ *  Returns a pointer to a D which comes immediately after S[count].
+ */
+template <typename D, typename S> static D* SkTAfter(S* ptr, size_t count = 1) {
+    return reinterpret_cast<D*>(ptr + count);
+}
+
+/**
+ *  Returns a pointer to a D which comes byteOffset bytes after S.
+ */
+template <typename D, typename S> static D* SkTAddOffset(S* ptr, size_t byteOffset) {
+    // The intermediate char* has the same const-ness as D as this produces better error messages.
+    // This relies on the fact that reinterpret_cast can add constness, but cannot remove it.
+    return reinterpret_cast<D*>(
+        reinterpret_cast<typename SkTConstType<char, SkTIsConst<D>::value>::type*>(ptr) + byteOffset
+    );
+}
+
 /** \class SkAutoTCallVProc
 
     Call a function when this goes out of scope. The template uses two
     parameters, the object, and a function that is to be called in the destructor.
     If detach() is called, the object reference is set to null. If the object
     reference is null when the destructor is called, we do not call the
     function.
 */
 template <typename T, void (*P)(T*)> class SkAutoTCallVProc : SkNoncopyable {
 public:
@@ skipping 186 matching lines @@
         return fArray[index];
     }
 
 private:
     size_t  fCount;
     T*      fArray;
     // since we come right after fArray, fStorage should be properly aligned
     char    fStorage[N * sizeof(T)];
 };
 
-/** Allocate a temp array on the stack/heap.
-    Does NOT call any constructors/destructors on T (i.e. T must be POD)
-*/
+/** Manages an array of T elements, freeing the array in the destructor.
+ *  Does NOT call any constructors/destructors on T (T must be POD).
+ */
 template <typename T> class SkAutoTMalloc : SkNoncopyable {
 public:
-    SkAutoTMalloc(size_t count) {
+    /** Takes ownership of the ptr. The ptr must be a value which can be passed to sk_free. */
+    explicit SkAutoTMalloc(T* ptr = NULL) {
+        fPtr = ptr;
+    }
+
+    /** Allocates space for 'count' Ts. */
+    explicit SkAutoTMalloc(size_t count) {
         fPtr = (T*)sk_malloc_flags(count * sizeof(T), SK_MALLOC_THROW | SK_MALLOC_TEMP);
     }
 
     ~SkAutoTMalloc() {
         sk_free(fPtr);
     }
 
-    // doesn't preserve contents
-    void reset (size_t count) {
+    /** Resize the memory area pointed to by the current ptr preserving contents. */
+    void realloc(size_t count) {
+        fPtr = reinterpret_cast<T*>(sk_realloc_throw(fPtr, count * sizeof(T)));
+    }
+
+    /** Resize the memory area pointed to by the current ptr without preserving contents. */
+    void reset(size_t count) {
         sk_free(fPtr);
         fPtr = fPtr = (T*)sk_malloc_flags(count * sizeof(T), SK_MALLOC_THROW | SK_MALLOC_TEMP);
     }
 
     T* get() const { return fPtr; }
 
     operator T*() {
         return fPtr;
     }
 
     operator const T*() const {
         return fPtr;
     }
 
     T& operator[](int index) {
         return fPtr[index];
     }
 
     const T& operator[](int index) const {
         return fPtr[index];
     }
 
+    /**
+     *  Transfer ownership of the ptr to the caller, setting the internal
+     *  pointer to NULL. Note that this differs from get(), which also returns
+     *  the pointer, but it does not transfer ownership.
+     */
+    T* detach() {
+        T* ptr = fPtr;
+        fPtr = NULL;
+        return ptr;
+    }
+
 private:
-    T*  fPtr;
+    T* fPtr;
 };
 
 template <size_t N, typename T> class SK_API SkAutoSTMalloc : SkNoncopyable {
 public:
     SkAutoSTMalloc() {
         fPtr = NULL;
     }
 
     SkAutoSTMalloc(size_t count) {
         if (count > N) {
@@ skipping 77 matching lines @@
     /**
      * Returns void* because this object does not initialize the
      * memory. Use placement new for types that require a cons.
      */
     void* get() { return fStorage.get(); }
 private:
     SkAlignedSStorage<sizeof(T)*N> fStorage;
 };
 
 #endif