1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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 <sal/config.h>
#include <algorithm>
#include <vcl/bitmap.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/bitmapaccess.hxx>
#include <vcl/BitmapSobelGreyFilter.hxx>
#include <bitmapwriteaccess.hxx>
BitmapEx BitmapSobelGreyFilter::execute(BitmapEx const& rBitmapEx) const
{
Bitmap aBitmap(rBitmapEx.GetBitmap());
bool bRet = aBitmap.ImplMakeGreyscales(256);
if (bRet)
{
bRet = false;
Bitmap::ScopedReadAccess pReadAcc(aBitmap);
if (pReadAcc)
{
Bitmap aNewBmp(aBitmap.GetSizePixel(), 8, &pReadAcc->GetPalette());
BitmapScopedWriteAccess pWriteAcc(aNewBmp);
if (pWriteAcc)
{
BitmapColor aGrey(sal_uInt8(0));
const tools::Long nWidth = pWriteAcc->Width();
const tools::Long nHeight = pWriteAcc->Height();
const tools::Long nMask111 = -1, nMask121 = 0, nMask131 = 1;
const tools::Long nMask211 = -2, nMask221 = 0, nMask231 = 2;
const tools::Long nMask311 = -1, nMask321 = 0, nMask331 = 1;
const tools::Long nMask112 = 1, nMask122 = 2, nMask132 = 1;
const tools::Long nMask212 = 0, nMask222 = 0, nMask232 = 0;
const tools::Long nMask312 = -1, nMask322 = -2, nMask332 = -1;
tools::Long nGrey11, nGrey12, nGrey13;
tools::Long nGrey21, nGrey22, nGrey23;
tools::Long nGrey31, nGrey32, nGrey33;
std::unique_ptr<long[]> pHMap(new long[nWidth + 2]);
std::unique_ptr<long[]> pVMap(new long[nHeight + 2]);
tools::Long nX, nY, nSum1, nSum2;
// fill mapping tables
pHMap[0] = 0;
for (nX = 1; nX <= nWidth; nX++)
{
pHMap[nX] = nX - 1;
}
pHMap[nWidth + 1] = nWidth - 1;
pVMap[0] = 0;
for (nY = 1; nY <= nHeight; nY++)
{
pVMap[nY] = nY - 1;
}
pVMap[nHeight + 1] = nHeight - 1;
for (nY = 0; nY < nHeight; nY++)
{
nGrey11 = pReadAcc->GetPixel(pVMap[nY], pHMap[0]).GetIndex();
nGrey12 = pReadAcc->GetPixel(pVMap[nY], pHMap[1]).GetIndex();
nGrey13 = pReadAcc->GetPixel(pVMap[nY], pHMap[2]).GetIndex();
nGrey21 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[0]).GetIndex();
nGrey22 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[1]).GetIndex();
nGrey23 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[2]).GetIndex();
nGrey31 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[0]).GetIndex();
nGrey32 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[1]).GetIndex();
nGrey33 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[2]).GetIndex();
Scanline pScanline = pWriteAcc->GetScanline(nY);
for (nX = 0; nX < nWidth; nX++)
{
nSum1 = nSum2 = 0;
nSum1 += nMask111 * nGrey11;
nSum2 += nMask112 * nGrey11;
nSum1 += nMask121 * nGrey12;
nSum2 += nMask122 * nGrey12;
nSum1 += nMask131 * nGrey13;
nSum2 += nMask132 * nGrey13;
nSum1 += nMask211 * nGrey21;
nSum2 += nMask212 * nGrey21;
nSum1 += nMask221 * nGrey22;
nSum2 += nMask222 * nGrey22;
nSum1 += nMask231 * nGrey23;
nSum2 += nMask232 * nGrey23;
nSum1 += nMask311 * nGrey31;
nSum2 += nMask312 * nGrey31;
nSum1 += nMask321 * nGrey32;
nSum2 += nMask322 * nGrey32;
nSum1 += nMask331 * nGrey33;
nSum2 += nMask332 * nGrey33;
nSum1 = static_cast<tools::Long>(
sqrt(static_cast<double>(nSum1 * nSum1 + nSum2 * nSum2)));
aGrey.SetIndex(~static_cast<sal_uInt8>(std::clamp(nSum1, 0L, 255L)));
pWriteAcc->SetPixelOnData(pScanline, nX, aGrey);
if (nX < (nWidth - 1))
{
const tools::Long nNextX = pHMap[nX + 3];
nGrey11 = nGrey12;
nGrey12 = nGrey13;
nGrey13 = pReadAcc->GetPixel(pVMap[nY], nNextX).GetIndex();
nGrey21 = nGrey22;
nGrey22 = nGrey23;
nGrey23 = pReadAcc->GetPixel(pVMap[nY + 1], nNextX).GetIndex();
nGrey31 = nGrey32;
nGrey32 = nGrey33;
nGrey33 = pReadAcc->GetPixel(pVMap[nY + 2], nNextX).GetIndex();
}
}
}
pHMap.reset();
pVMap.reset();
pWriteAcc.reset();
bRet = true;
}
pReadAcc.reset();
if (bRet)
{
const MapMode aMap(aBitmap.GetPrefMapMode());
const Size aPrefSize(aBitmap.GetPrefSize());
aBitmap = aNewBmp;
aBitmap.SetPrefMapMode(aMap);
aBitmap.SetPrefSize(aPrefSize);
}
}
}
if (bRet)
return BitmapEx(aBitmap);
return BitmapEx();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
