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64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <algorithm> // min & max
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#include <cstdlib>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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void BufferUnrotate(uint8_t* aBuffer, int aByteWidth, int aHeight,
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int aByteStride, int aXBoundary, int aYBoundary)
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{
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if (aXBoundary != 0) {
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uint8_t* line = new uint8_t[aByteWidth];
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uint32_t smallStart = 0;
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uint32_t smallLen = aXBoundary;
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uint32_t smallDest = aByteWidth - aXBoundary;
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uint32_t largeStart = aXBoundary;
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uint32_t largeLen = aByteWidth - aXBoundary;
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uint32_t largeDest = 0;
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if (aXBoundary > aByteWidth / 2) {
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smallStart = aXBoundary;
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smallLen = aByteWidth - aXBoundary;
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smallDest = 0;
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largeStart = 0;
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largeLen = aXBoundary;
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largeDest = smallLen;
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}
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for (int y = 0; y < aHeight; y++) {
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int yOffset = y * aByteStride;
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memcpy(line, &aBuffer[yOffset + smallStart], smallLen);
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memmove(&aBuffer[yOffset + largeDest], &aBuffer[yOffset + largeStart], largeLen);
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memcpy(&aBuffer[yOffset + smallDest], line, smallLen);
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}
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delete[] line;
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}
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if (aYBoundary != 0) {
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uint32_t smallestHeight = std::min(aHeight - aYBoundary, aYBoundary);
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uint32_t largestHeight = std::max(aHeight - aYBoundary, aYBoundary);
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uint32_t smallOffset = 0;
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uint32_t largeOffset = aYBoundary * aByteStride;
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uint32_t largeDestOffset = 0;
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uint32_t smallDestOffset = largestHeight * aByteStride;
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if (aYBoundary > aHeight / 2) {
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smallOffset = aYBoundary * aByteStride;
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largeOffset = 0;
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largeDestOffset = smallestHeight * aByteStride;
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smallDestOffset = 0;
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}
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uint8_t* smallestSide = new uint8_t[aByteStride * smallestHeight];
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memcpy(smallestSide, &aBuffer[smallOffset], aByteStride * smallestHeight);
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memmove(&aBuffer[largeDestOffset], &aBuffer[largeOffset], aByteStride * largestHeight);
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memcpy(&aBuffer[smallDestOffset], smallestSide, aByteStride * smallestHeight);
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delete[] smallestSide;
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}
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}
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