LibreOffice Module vcl (master) 1
BitmapSymmetryCheck.cxx
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1/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2/*
3 * This file is part of the LibreOffice project.
4 *
5 * This Source Code Form is subject to the terms of the Mozilla Public
6 * License, v. 2.0. If a copy of the MPL was not distributed with this
7 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 *
9 */
10
12
14
16{}
17
19{
20 Bitmap::ScopedReadAccess aReadAccess(rBitmap);
21 return checkImpl(aReadAccess.get());
22}
23
25{
26 tools::Long nHeight = pReadAccess->Height();
27 tools::Long nWidth = pReadAccess->Width();
28
29 tools::Long nHeightHalf = nHeight / 2;
30 tools::Long nWidthHalf = nWidth / 2;
31
32 bool bHeightEven = (nHeight % 2) == 0;
33 bool bWidthEven = (nWidth % 2) == 0;
34
35 for (tools::Long y = 0; y < nHeightHalf; ++y)
36 {
37 Scanline pScanlineRead = pReadAccess->GetScanline( y );
38 Scanline pScanlineRead2 = pReadAccess->GetScanline( nHeight - y - 1 );
39 for (tools::Long x = 0; x < nWidthHalf; ++x)
40 {
41 if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead2, x))
42 {
43 return false;
44 }
45 if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead, nWidth - x - 1))
46 {
47 return false;
48 }
49 if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead2, nWidth - x - 1))
50 {
51 return false;
52 }
53 }
54 }
55
56 if (bWidthEven)
57 {
58 for (tools::Long y = 0; y < nHeightHalf; ++y)
59 {
60 if (pReadAccess->GetPixel(y, nWidthHalf) != pReadAccess->GetPixel(nHeight - y - 1, nWidthHalf))
61 {
62 return false;
63 }
64 }
65 }
66
67 if (bHeightEven)
68 {
69 Scanline pScanlineRead = pReadAccess->GetScanline( nHeightHalf );
70 for (tools::Long x = 0; x < nWidthHalf; ++x)
71 {
72 if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead, nWidth - x - 1))
73 {
74 return false;
75 }
76 }
77 }
78
79 return true;
80}
81
82
83/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
sal_uInt8 * Scanline
Definition: Scanline.hxx:26
tools::Long Height() const
tools::Long Width() const
BitmapColor GetPixel(tools::Long nY, tools::Long nX) const
BitmapColor GetPixelFromData(const sal_uInt8 *pData, tools::Long nX) const
Scanline GetScanline(tools::Long nY) const
static bool checkImpl(BitmapReadAccess const *pReadAccess)
static bool check(Bitmap &rBitmap)
float y
float x
long Long