MeshTools: return Containers::Array instead of pointer from compressIndices().

This is source-incompatible change, but this function probably wasn't
used much in user code, rather its Mesh/Buffer convenience overload.

Actually Containers::Array<char> has _implicit_ conversion operator to
char*, but this should not be an issue, as the conversion is not allowed
on rvalue references, thus the following code shouldn't compile at all.
Not available on GCC < 4.8.1, though.

        // ...
        char* data;
        std::tie(..., data) = MeshTools::compressIndices(...);

src/MeshTools/CompressIndices.cpp

@@ -38,17 +38,17 @@ template<> constexpr Mesh::IndexType indexType<UnsignedByte>() { return Mesh::In
 template<> constexpr Mesh::IndexType indexType<UnsignedShort>() { return Mesh::IndexType::UnsignedShort; }
 template<> constexpr Mesh::IndexType indexType<UnsignedInt>() { return Mesh::IndexType::UnsignedInt; }
 
-template<class T> inline std::tuple<std::size_t, Mesh::IndexType, char*> compress(const std::vector<UnsignedInt>& indices) {
-    char* buffer = new char[indices.size()*sizeof(T)];
+template<class T> inline std::tuple<std::size_t, Mesh::IndexType, Containers::Array<char>> compress(const std::vector<UnsignedInt>& indices) {
+    Containers::Array<char> buffer(indices.size()*sizeof(T));
     for(std::size_t i = 0; i != indices.size(); ++i) {
         T index = static_cast<T>(indices[i]);
-        std::memcpy(buffer+i*sizeof(T), &index, sizeof(T));
+        std::memcpy(buffer.begin()+i*sizeof(T), &index, sizeof(T));
     }
 
-    return std::make_tuple(indices.size(), indexType<T>(), buffer);
+    return std::make_tuple(indices.size(), indexType<T>(), std::move(buffer));
 }
 
-std::tuple<std::size_t, Mesh::IndexType, char*> compressIndicesInternal(const std::vector<UnsignedInt>& indices, UnsignedInt max) {
+std::tuple<std::size_t, Mesh::IndexType, Containers::Array<char>> compressIndicesInternal(const std::vector<UnsignedInt>& indices, UnsignedInt max) {
     switch(Math::log(256, max)) {
         case 0:
             return compress<UnsignedByte>(indices);
@@ -65,7 +65,7 @@ std::tuple<std::size_t, Mesh::IndexType, char*> compressIndicesInternal(const st
 
 }
 
-std::tuple<std::size_t, Mesh::IndexType, char*> compressIndices(const std::vector<UnsignedInt>& indices) {
+std::tuple<std::size_t, Mesh::IndexType, Containers::Array<char>> compressIndices(const std::vector<UnsignedInt>& indices) {
     return compressIndicesInternal(indices, *std::max_element(indices.begin(), indices.end()));
 }
 
@@ -76,14 +76,12 @@ void compressIndices(Mesh& mesh, Buffer& buffer, Buffer::Usage usage, const std:
 
     std::size_t indexCount;
     Mesh::IndexType indexType;
-    char* data;
+    Containers::Array<char> data;
     std::tie(indexCount, indexType, data) = compressIndicesInternal(indices, *minmax.second);
 
     mesh.setIndexCount(indices.size())
         .setIndexBuffer(buffer, 0, indexType, *minmax.first, *minmax.second);
-    buffer.setData({data, indexCount*Mesh::indexSize(indexType)}, usage);
-
-    delete[] data;
+    buffer.setData(data, usage);
 }
 
 }}

src/MeshTools/CompressIndices.h

@@ -40,28 +40,23 @@ namespace Magnum { namespace MeshTools {
 /**
 @brief Compress vertex indices
 @param indices  Index array
-@return Index count, type and compressed index array. Deleting the array is
-    user responsibility.
+@return Index count, type and compressed index array
 
 This function takes index array and outputs them compressed to smallest
 possible size. For example when your indices have maximum number 463, it's
 wasteful to store them in array of 32bit integers, array of 16bit integers is
-sufficient. Size of the buffer can be computed from index count and type, as
-shown below. Example usage:
+sufficient. Example usage:
 @code
 std::size_t indexCount;
 Mesh::IndexType indexType;
-char* data;
+Containers::Array<char> data;
 std::tie(indexCount, indexType, data) = MeshTools::compressIndices(indices);
-std::size_t dataSize = indexCount*Mesh::indexSize(indexType);
-// ...
-delete[] data;
 @endcode
 
 See also compressIndices(Mesh*, Buffer*, Buffer::Usage, const std::vector<UnsignedInt>&),
 which writes the compressed data directly into index buffer of given mesh.
 */
-std::tuple<std::size_t, Mesh::IndexType, char*> MAGNUM_MESHTOOLS_EXPORT compressIndices(const std::vector<UnsignedInt>& indices);
+std::tuple<std::size_t, Mesh::IndexType, Containers::Array<char>> MAGNUM_MESHTOOLS_EXPORT compressIndices(const std::vector<UnsignedInt>& indices);
 
 /**
 @brief Compress vertex indices and write them to index buffer

src/MeshTools/Test/CompressIndicesTest.cpp

@@ -47,48 +47,44 @@ CompressIndicesTest::CompressIndicesTest() {
 void CompressIndicesTest::compressChar() {
     std::size_t indexCount;
     Mesh::IndexType indexType;
-    char* data;
+    Containers::Array<char> data;
     std::tie(indexCount, indexType, data) = MeshTools::compressIndices(
         std::vector<UnsignedInt>{1, 2, 3, 0, 4});
 
     CORRADE_COMPARE(indexCount, 5);
     CORRADE_VERIFY(indexType == Mesh::IndexType::UnsignedByte);
-    CORRADE_COMPARE(std::vector<char>(data, data+indexCount*Mesh::indexSize(indexType)),
+    CORRADE_COMPARE(std::vector<char>(data.begin(), data.end()),
         (std::vector<char>{ 0x01, 0x02, 0x03, 0x00, 0x04 }));
-
-    delete[] data;
 }
 
 void CompressIndicesTest::compressShort() {
     std::size_t indexCount;
     Mesh::IndexType indexType;
-    char* data;
+    Containers::Array<char> data;
     std::tie(indexCount, indexType, data) = MeshTools::compressIndices(
         std::vector<UnsignedInt>{1, 256, 0, 5});
 
     CORRADE_COMPARE(indexCount, 4);
     CORRADE_VERIFY(indexType == Mesh::IndexType::UnsignedShort);
     if(!Utility::Endianness::isBigEndian()) {
-        CORRADE_COMPARE(std::vector<char>(data, data+indexCount*Mesh::indexSize(indexType)),
+        CORRADE_COMPARE(std::vector<char>(data.begin(), data.end()),
             (std::vector<char>{ 0x01, 0x00,
                            0x00, 0x01,
                            0x00, 0x00,
                            0x05, 0x00 }));
     } else {
-        CORRADE_COMPARE(std::vector<char>(data, data+indexCount*Mesh::indexSize(indexType)),
+        CORRADE_COMPARE(std::vector<char>(data.begin(), data.end()),
             (std::vector<char>{ 0x00, 0x01,
                            0x01, 0x00,
                            0x00, 0x00,
                            0x00, 0x05 }));
     }
-
-    delete[] data;
 }
 
 void CompressIndicesTest::compressInt() {
     std::size_t indexCount;
     Mesh::IndexType indexType;
-    char* data;
+    Containers::Array<char> data;
     std::tie(indexCount, indexType, data) = MeshTools::compressIndices(
         std::vector<UnsignedInt>{65536, 3, 2});
 
@@ -96,18 +92,16 @@ void CompressIndicesTest::compressInt() {
     CORRADE_VERIFY(indexType == Mesh::IndexType::UnsignedInt);
 
     if(!Utility::Endianness::isBigEndian()) {
-        CORRADE_COMPARE(std::vector<char>(data, data+indexCount*Mesh::indexSize(indexType)),
+        CORRADE_COMPARE(std::vector<char>(data.begin(), data.end()),
             (std::vector<char>{ 0x00, 0x00, 0x01, 0x00,
                            0x03, 0x00, 0x00, 0x00,
                            0x02, 0x00, 0x00, 0x00 }));
     } else {
-        CORRADE_COMPARE(std::vector<char>(data, data+indexCount*Mesh::indexSize(indexType)),
+        CORRADE_COMPARE(std::vector<char>(data.begin(), data.end()),
             (std::vector<char>{ 0x00, 0x01, 0x00, 0x00,
                            0x00, 0x00, 0x00, 0x03,
                            0x00, 0x00, 0x00, 0x02 }));
     }
-
-    delete[] data;
 }
 
 }}}