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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "BufferUnrotate.h"
#include <algorithm> // min & max
#include <stdint.h>
#include <string.h>
namespace mozilla {
namespace gfx {
void BufferUnrotate(uint8_t* aBuffer, int aByteWidth, int aHeight,
int aByteStride, int aXBoundary, int aYBoundary) {
if (aXBoundary != 0) {
uint8_t* line = new uint8_t[aByteWidth];
uint32_t smallStart = 0;
uint32_t smallLen = aXBoundary;
uint32_t smallDest = aByteWidth - aXBoundary;
uint32_t largeStart = aXBoundary;
uint32_t largeLen = aByteWidth - aXBoundary;
uint32_t largeDest = 0;
if (aXBoundary > aByteWidth / 2) {
smallStart = aXBoundary;
smallLen = aByteWidth - aXBoundary;
smallDest = 0;
largeStart = 0;
largeLen = aXBoundary;
largeDest = smallLen;
}
for (int y = 0; y < aHeight; y++) {
int yOffset = y * aByteStride;
memcpy(line, &aBuffer[yOffset + smallStart], smallLen);
memmove(&aBuffer[yOffset + largeDest], &aBuffer[yOffset + largeStart],
largeLen);
memcpy(&aBuffer[yOffset + smallDest], line, smallLen);
}
delete[] line;
}
if (aYBoundary != 0) {
uint32_t smallestHeight = std::min(aHeight - aYBoundary, aYBoundary);
uint32_t largestHeight = std::max(aHeight - aYBoundary, aYBoundary);
uint32_t smallOffset = 0;
uint32_t largeOffset = aYBoundary * aByteStride;
uint32_t largeDestOffset = 0;
uint32_t smallDestOffset = largestHeight * aByteStride;
if (aYBoundary > aHeight / 2) {
smallOffset = aYBoundary * aByteStride;
largeOffset = 0;
largeDestOffset = smallestHeight * aByteStride;
smallDestOffset = 0;
}
uint8_t* smallestSide = new uint8_t[aByteStride * smallestHeight];
memcpy(smallestSide, &aBuffer[smallOffset], aByteStride * smallestHeight);
memmove(&aBuffer[largeDestOffset], &aBuffer[largeOffset],
aByteStride * largestHeight);
memcpy(&aBuffer[smallDestOffset], smallestSide,
aByteStride * smallestHeight);
delete[] smallestSide;
}
}
} // namespace gfx
} // namespace mozilla
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