blob: 20fb898a616ea0d03ec831aa6977afc876f42763 (
plain)
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
|
/* -*- 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef SD_SLIDESORTER_BITMAP_COMPRESSOR_HXX
#define SD_SLIDESORTER_BITMAP_COMPRESSOR_HXX
#include <sal/types.h>
#include <tools/gen.hxx>
#include <boost/shared_ptr.hpp>
class Bitmap;
namespace sd { namespace slidesorter { namespace cache {
class BitmapReplacement;
/** This interface class provides the minimal method set for classes that
implement the compression and decompression of preview bitmaps.
*/
class BitmapCompressor
{
public:
/** Compress the given bitmap into a replacement format that is specific
to the compressor class.
*/
virtual ::boost::shared_ptr<BitmapReplacement> Compress (const Bitmap& rBitmap) const = 0;
/** Decompress the given replacement data into a preview bitmap.
Depending on the compression technique the returned bitmap may
differ from the original bitmap given to the Compress() method. It
may even of the wrong size or empty or the NULL pointer. It is the
task of the caller to create a new preview bitmap if the returned
one is not as desired.
*/
virtual Bitmap Decompress (const BitmapReplacement& rBitmapData)const=0;
/** Return whether the compression and decompression is lossless. This
value is used by the caller of Decompress() to decide whether to use
the returned bitmap as is or if a new preview has to be created.
*/
virtual bool IsLossless (void) const = 0;
protected:
~BitmapCompressor() {}
};
/** Interface for preview bitmap replacements. Each bitmap
compressor/decompressor has to provide an implementation that is
suitable to store the compressed bitmaps.
*/
class BitmapReplacement
{
public:
virtual sal_Int32 GetMemorySize (void) const { return 0; }
protected:
~BitmapReplacement() {}
};
/** This is one trivial bitmap compressor. It stores bitmaps unmodified
instead of compressing them.
This compressor is lossless.
*/
class NoBitmapCompression
: public BitmapCompressor
{
class DummyReplacement;
public:
virtual ~NoBitmapCompression() {}
virtual ::boost::shared_ptr<BitmapReplacement> Compress (const Bitmap& rpBitmap) const;
virtual Bitmap Decompress (const BitmapReplacement& rBitmapData) const;
virtual bool IsLossless (void) const;
};
/** This is another trivial bitmap compressor. Instead of compressing a
bitmap, it throws the bitmap away. Its Decompress() method returns a
NULL pointer. The caller has to create a new preview bitmap instead.
This compressor clearly is not lossless.
*/
class CompressionByDeletion
: public BitmapCompressor
{
public:
virtual ~CompressionByDeletion() {}
virtual ::boost::shared_ptr<BitmapReplacement> Compress (const Bitmap& rBitmap) const;
virtual Bitmap Decompress (const BitmapReplacement& rBitmapData) const;
virtual bool IsLossless (void) const;
};
/** Compress a preview bitmap by reducing its resolution. While the aspect
ratio is maintained the horizontal resolution is scaled down to 100
pixels.
This compressor is not lossless.
*/
class ResolutionReduction
: public BitmapCompressor
{
class ResolutionReducedReplacement;
static const sal_Int32 mnWidth = 100;
public:
virtual ~ResolutionReduction() {}
virtual ::boost::shared_ptr<BitmapReplacement> Compress (const Bitmap& rpBitmap) const;
/** Scale the replacement bitmap up to the original size.
*/
virtual Bitmap Decompress (const BitmapReplacement& rBitmapData) const;
virtual bool IsLossless (void) const;
};
/** Compress preview bitmaps using the PNG format.
This compressor is lossless.
*/
class PngCompression
: public BitmapCompressor
{
class PngReplacement;
public:
virtual ~PngCompression() {}
virtual ::boost::shared_ptr<BitmapReplacement> Compress (const Bitmap& rBitmap) const;
virtual Bitmap Decompress (const BitmapReplacement& rBitmapData) const;
virtual bool IsLossless (void) const;
};
} } } // end of namespace ::sd::slidesorter::cache
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
