Move SkUtils.h to src/core.

Review URL: https://codereview.chromium.org/1722703003

1 files changed, 93 insertions, 0 deletions

diff --git a/src/core/SkUtils.h b/src/core/SkUtils.h
new file mode 100644
index 0000000000..332ea8da7e
--- /dev/null
+++ b/src/core/SkUtils.h
@@ -0,0 +1,93 @@
+/*
+ * 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 SkUtils_DEFINED
+#define SkUtils_DEFINED
+
+#include "SkTypes.h"
+
+/** Similar to memset(), but it assigns a 16bit value into the buffer.
+    @param buffer   The memory to have value copied into it
+    @param value    The 16bit value to be copied into buffer
+    @param count    The number of times value should be copied into the buffer.
+*/
+static inline void sk_memset16(uint16_t buffer[], uint16_t value, int count) {
+    for (int i = 0; i < count; i++) {
+        buffer[i] = value;
+    }
+}
+
+/** Similar to memset(), but it assigns a 32bit value into the buffer.
+    @param buffer   The memory to have value copied into it
+    @param value    The 32bit value to be copied into buffer
+    @param count    The number of times value should be copied into the buffer.
+*/
+static inline void sk_memset32(uint32_t buffer[], uint32_t value, int count) {
+    for (int i = 0; i < count; i++) {
+        buffer[i] = value;
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#define kMaxBytesInUTF8Sequence     4
+
+#ifdef SK_DEBUG
+    int SkUTF8_LeadByteToCount(unsigned c);
+#else
+    #define SkUTF8_LeadByteToCount(c)   ((((0xE5 << 24) >> ((unsigned)c >> 4 << 1)) & 3) + 1)
+#endif
+
+inline int SkUTF8_CountUTF8Bytes(const char utf8[]) {
+    SkASSERT(utf8);
+    return SkUTF8_LeadByteToCount(*(const uint8_t*)utf8);
+}
+
+int         SkUTF8_CountUnichars(const char utf8[]);
+int         SkUTF8_CountUnichars(const char utf8[], size_t byteLength);
+SkUnichar   SkUTF8_ToUnichar(const char utf8[]);
+SkUnichar   SkUTF8_NextUnichar(const char**);
+SkUnichar   SkUTF8_PrevUnichar(const char**);
+
+/** Return the number of bytes need to convert a unichar
+    into a utf8 sequence. Will be 1..kMaxBytesInUTF8Sequence,
+    or 0 if uni is illegal.
+*/
+size_t      SkUTF8_FromUnichar(SkUnichar uni, char utf8[] = NULL);
+
+///////////////////////////////////////////////////////////////////////////////
+
+#define SkUTF16_IsHighSurrogate(c)  (((c) & 0xFC00) == 0xD800)
+#define SkUTF16_IsLowSurrogate(c)   (((c) & 0xFC00) == 0xDC00)
+
+int SkUTF16_CountUnichars(const uint16_t utf16[]);
+int SkUTF16_CountUnichars(const uint16_t utf16[], int numberOf16BitValues);
+// returns the current unichar and then moves past it (*p++)
+SkUnichar SkUTF16_NextUnichar(const uint16_t**);
+// this guy backs up to the previus unichar value, and returns it (*--p)
+SkUnichar SkUTF16_PrevUnichar(const uint16_t**);
+size_t SkUTF16_FromUnichar(SkUnichar uni, uint16_t utf16[] = NULL);
+
+size_t SkUTF16_ToUTF8(const uint16_t utf16[], int numberOf16BitValues,
+                      char utf8[] = NULL);
+
+inline bool SkUnichar_IsVariationSelector(SkUnichar uni) {
+/*  The 'true' ranges are:
+ *      0x180B  <= uni <=  0x180D
+ *      0xFE00  <= uni <=  0xFE0F
+ *      0xE0100 <= uni <= 0xE01EF
+ */
+    if (uni < 0x180B || uni > 0xE01EF) {
+        return false;
+    }
+    if ((uni > 0x180D && uni < 0xFE00) || (uni > 0xFE0F && uni < 0xE0100)) {
+        return false;
+    }
+    return true;
+}
+
+#endif