gfx/layers/BufferUnrotate.cpp@97036ab72558
gfx/layers/BufferUnrotate.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 * This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 #include <algorithm> // min & max
7 #include <cstdlib>
8 #include <stdint.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
13 void BufferUnrotate(uint8_t* aBuffer, int aByteWidth, int aHeight,
14 int aByteStride, int aXBoundary, int aYBoundary)
15 {
16 if (aXBoundary != 0) {
17 uint8_t* line = new uint8_t[aByteWidth];
18 uint32_t smallStart = 0;
19 uint32_t smallLen = aXBoundary;
20 uint32_t smallDest = aByteWidth - aXBoundary;
21 uint32_t largeStart = aXBoundary;
22 uint32_t largeLen = aByteWidth - aXBoundary;
23 uint32_t largeDest = 0;
24 if (aXBoundary > aByteWidth / 2) {
25 smallStart = aXBoundary;
26 smallLen = aByteWidth - aXBoundary;
27 smallDest = 0;
28 largeStart = 0;
29 largeLen = aXBoundary;
30 largeDest = smallLen;
31 }
33 for (int y = 0; y < aHeight; y++) {
34 int yOffset = y * aByteStride;
35 memcpy(line, &aBuffer[yOffset + smallStart], smallLen);
36 memmove(&aBuffer[yOffset + largeDest], &aBuffer[yOffset + largeStart], largeLen);
37 memcpy(&aBuffer[yOffset + smallDest], line, smallLen);
38 }
40 delete[] line;
41 }
43 if (aYBoundary != 0) {
44 uint32_t smallestHeight = std::min(aHeight - aYBoundary, aYBoundary);
45 uint32_t largestHeight = std::max(aHeight - aYBoundary, aYBoundary);
46 uint32_t smallOffset = 0;
47 uint32_t largeOffset = aYBoundary * aByteStride;
48 uint32_t largeDestOffset = 0;
49 uint32_t smallDestOffset = largestHeight * aByteStride;
50 if (aYBoundary > aHeight / 2) {
51 smallOffset = aYBoundary * aByteStride;
52 largeOffset = 0;
53 largeDestOffset = smallestHeight * aByteStride;
54 smallDestOffset = 0;
55 }
57 uint8_t* smallestSide = new uint8_t[aByteStride * smallestHeight];
58 memcpy(smallestSide, &aBuffer[smallOffset], aByteStride * smallestHeight);
59 memmove(&aBuffer[largeDestOffset], &aBuffer[largeOffset], aByteStride * largestHeight);
60 memcpy(&aBuffer[smallDestOffset], smallestSide, aByteStride * smallestHeight);
61 delete[] smallestSide;
62 }
63 }
