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/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SFNTLY_CPP_SRC_SFNTLY_MATH_FONT_MATH_H_
#define SFNTLY_CPP_SRC_SFNTLY_MATH_FONT_MATH_H_
#include "sfntly/port/type.h"
namespace sfntly {
class FontMath {
public:
static int32_t Log2(int32_t a) {
int r = 0; // r will be lg(a)
while (a != 0) {
a >>= 1;
r++;
}
return r - 1;
}
// Calculates the amount of padding needed. The values provided need to be in
// the same units. So, if the size is given as the number of bytes then the
// alignment size must also be specified as byte size to align to.
// @param size the size of the data that may need padding
// @param alignmentSize the number of units to align to
// @return the number of units needing to be added for alignment
static int32_t PaddingRequired(int32_t size, int32_t alignment_size) {
int32_t padding = alignment_size - (size % alignment_size);
return padding == alignment_size ? 0 : padding;
}
};
} // namespace sfntly
#endif // SFNTLY_CPP_SRC_SFNTLY_MATH_FONT_MATH_H_
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