skia WIPjarred/canvas

1 files changed, 118 insertions, 0 deletions

diff --git a/src/deps/skia/include/core/SkDataTable.h b/src/deps/skia/include/core/SkDataTable.h
new file mode 100644
index 000000000..a6a510b7b
--- /dev/null
+++ b/src/deps/skia/include/core/SkDataTable.h
@@ -0,0 +1,118 @@
+/*
+ * 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 SkDataTable_DEFINED
+#define SkDataTable_DEFINED
+
+#include "include/core/SkData.h"
+#include "include/private/SkTDArray.h"
+
+/**
+ *  Like SkData, SkDataTable holds an immutable data buffer. The data buffer is
+ *  organized into a table of entries, each with a length, so the entries are
+ *  not required to all be the same size.
+ */
+class SK_API SkDataTable : public SkRefCnt {
+public:
+    /**
+     *  Returns true if the table is empty (i.e. has no entries).
+     */
+    bool isEmpty() const { return 0 == fCount; }
+
+    /**
+     *  Return the number of entries in the table. 0 for an empty table
+     */
+    int count() const { return fCount; }
+
+    /**
+     *  Return the size of the index'th entry in the table. The caller must
+     *  ensure that index is valid for this table.
+     */
+    size_t atSize(int index) const;
+
+    /**
+     *  Return a pointer to the data of the index'th entry in the table.
+     *  The caller must ensure that index is valid for this table.
+     *
+     *  @param size If non-null, this returns the byte size of this entry. This
+     *              will be the same value that atSize(index) would return.
+     */
+    const void* at(int index, size_t* size = nullptr) const;
+
+    template <typename T>
+    const T* atT(int index, size_t* size = nullptr) const {
+        return reinterpret_cast<const T*>(this->at(index, size));
+    }
+
+    /**
+     *  Returns the index'th entry as a c-string, and assumes that the trailing
+     *  null byte had been copied into the table as well.
+     */
+    const char* atStr(int index) const {
+        size_t size;
+        const char* str = this->atT<const char>(index, &size);
+        SkASSERT(strlen(str) + 1 == size);
+        return str;
+    }
+
+    typedef void (*FreeProc)(void* context);
+
+    static sk_sp<SkDataTable> MakeEmpty();
+
+    /**
+     *  Return a new DataTable that contains a copy of the data stored in each
+     *  "array".
+     *
+     *  @param ptrs array of points to each element to be copied into the table.
+     *  @param sizes array of byte-lengths for each entry in the corresponding
+     *               ptrs[] array.
+     *  @param count the number of array elements in ptrs[] and sizes[] to copy.
+     */
+    static sk_sp<SkDataTable> MakeCopyArrays(const void * const * ptrs,
+                                             const size_t sizes[], int count);
+
+    /**
+     *  Return a new table that contains a copy of the data in array.
+     *
+     *  @param array contiguous array of data for all elements to be copied.
+     *  @param elemSize byte-length for a given element.
+     *  @param count the number of entries to be copied out of array. The number
+     *               of bytes that will be copied is count * elemSize.
+     */
+    static sk_sp<SkDataTable> MakeCopyArray(const void* array, size_t elemSize, int count);
+
+    static sk_sp<SkDataTable> MakeArrayProc(const void* array, size_t elemSize, int count,
+                                            FreeProc proc, void* context);
+
+private:
+    struct Dir {
+        const void* fPtr;
+        uintptr_t   fSize;
+    };
+
+    int         fCount;
+    size_t      fElemSize;
+    union {
+        const Dir*  fDir;
+        const char* fElems;
+    } fU;
+
+    FreeProc    fFreeProc;
+    void*       fFreeProcContext;
+
+    SkDataTable();
+    SkDataTable(const void* array, size_t elemSize, int count,
+                FreeProc, void* context);
+    SkDataTable(const Dir*, int count, FreeProc, void* context);
+    ~SkDataTable() override;
+
+    friend class SkDataTableBuilder;    // access to Dir
+
+    using INHERITED = SkRefCnt;
+};
+
+#endif