SkPDF: in-place font subsetting

src/utils/SkBitSet.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkBitSet_DEFINED
 #define SkBitSet_DEFINED
 
 #include "SkTypes.h"
 #include "SkTDArray.h"
 
 class SkBitSet {
 public:
     /** NumberOfBits must be greater than zero.
      */
     explicit SkBitSet(int numberOfBits);
-    explicit SkBitSet(const SkBitSet& source);
-    explicit SkBitSet(SkBitSet&&);
+    SkBitSet(const SkBitSet&) = delete;
+    SkBitSet(SkBitSet&&);
+    SkBitSet& operator=(const SkBitSet&) = delete;
+    SkBitSet& operator=(SkBitSet&& rhs);
 
-    SkBitSet& operator=(const SkBitSet& rhs);
     bool operator==(const SkBitSet& rhs);
     bool operator!=(const SkBitSet& rhs);
 
     /** Clear all data.
      */
     void clearAll();
 
     /** Set the value of the index-th bit.
      */
     void setBit(int index, bool value) {
         uint32_t mask = 1 << (index & 31);
         uint32_t* chunk = this->internalGet(index);
         if (value) {
             *chunk |= mask;
         } else {
             *chunk &= ~mask;
         }
     }
+    void set(int index) { this->setBit(index, true); }
+
+    template<typename T>
+    void setAll(T* array, int len) {
+        static_assert(std::is_integral<T>::value, "T is integral");
+        for (int i = 0; i < len; ++i) {
+            this->set(static_cast<int>(array[i]));
+        }
+    }
 
     /** Test if bit index is set.
      */
     bool isBitSet(int index) const {
         uint32_t mask = 1 << (index & 31);
         return SkToBool(*this->internalGet(index) & mask);
     }
+    bool has(int index) const { return this->isBitSet(index); }
 
     /** Or bits from source.  false is returned if this doesn't have the same
      *  bit count as source.
      */
     bool orBits(const SkBitSet& source);
 
     /** Export indices of set bits to T array.
      */
     template<typename T>
     void exportTo(SkTDArray<T>* array) const {
+        static_assert(std::is_integral<T>::value, "T is integral");
         SkASSERT(array);
         uint32_t* data = reinterpret_cast<uint32_t*>(fBitData.get());
         for (unsigned int i = 0; i < fDwordCount; ++i) {
             uint32_t value = data[i];
             if (value) {  // There are set bits
                 unsigned int index = i * 32;
                 for (unsigned int j = 0; j < 32; ++j) {
                     if (0x1 & (value >> j)) {
                         array->push(index + j);
                     }
@@ skipping 11 matching lines @@
     uint32_t* internalGet(int index) const {
         SkASSERT((size_t)index < fBitCount);
         size_t internalIndex = index / 32;
         SkASSERT(internalIndex < fDwordCount);
         return reinterpret_cast<uint32_t*>(fBitData.get()) + internalIndex;
     }
 };
 
 
 #endif