/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- * 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 <algorithm> // min & max #include <cstdlib> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> 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; } }