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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/*************************************************************************
This project implements a complete(!) JPEG (Recommendation ITU-T
T.81 | ISO/IEC 10918-1) codec, plus a library that can be used to
encode and decode JPEG streams.
It also implements ISO/IEC 18477 aka JPEG XT which is an extension
towards intermediate, high-dynamic-range lossy and lossless coding
of JPEG. In specific, it supports ISO/IEC 18477-3/-6/-7/-8 encoding.
Note that only Profiles C and D of ISO/IEC 18477-7 are supported
here. Check the JPEG XT reference software for a full implementation
of ISO/IEC 18477-7.
Copyright (C) 2012-2018 Thomas Richter, University of Stuttgart and
Accusoft. (C) 2019-2020 Thomas Richter, Fraunhofer IIS.
This program is available under two licenses, GPLv3 and the ITU
Software licence Annex A Option 2, RAND conditions.
For the full text of the GPU license option, see README.license.gpl.
For the full text of the ITU license option, see README.license.itu.
You may freely select between these two options.
For the GPL option, please note the following:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*************************************************************************/
/*
**
** This class pulls single lines from the frame and reconstructs
** them from the codestream. Only the lossless scheme uses this buffer
** organization.
**
** $Id: linebitmaprequester.hpp,v 1.24 2017/11/28 13:08:08 thor Exp $
**
*/
#ifndef CONTROL_LINEARBITMAPREQUESTER_HPP
#define CONTROL_LINEARBITMAPREQUESTER_HPP
/// Includes
#include "control/bitmapctrl.hpp"
#include "control/linebuffer.hpp"
///
/// Forwards
class DCT;
class UpsamplerBase;
class DownsamplerBase;
class ColorTrafo;
struct Line;
///
/// class LineBitmapRequester
// This class pulls single lines from the frame and reconstructs
// them from the codestream. Only the lossless scheme uses this buffer
// organization.
class LineBitmapRequester : public LineBuffer, public BitmapCtrl {
//
class Environ *m_pEnviron;
class Frame *m_pFrame;
//
//
// Dimensions of the frame.
ULONG m_ulPixelWidth;
ULONG m_ulPixelHeight;
//
// Number of components in the frame.
UBYTE m_ucCount;
//
// Number of lines already in the input buffer on encoding.
ULONG *m_pulReadyLines;
//
// Downsampling operator.
class DownsamplerBase **m_ppDownsampler;
//
// And the inverse, if required.
class UpsamplerBase **m_ppUpsampler;
//
// Temporary bitmaps
struct ImageBitMap **m_ppTempIBM;
//
// Current position in reconstruction or encoding,
// going through the color transformation.
// On decoding, the line in here has the Y-coordinate
// in m_ulReadyLines.
struct Line ***m_pppImage;
//
// Temporary for decoding how many MCUs are ready on the next
// iteration.can be pulled next.
ULONG m_ulMaxMCU;
//
// True if subsampling is required.
bool m_bSubsampling;
//
// Build common structures for encoding and decoding
void BuildCommon(void);
//
// Advance the image line pointer by the next eight lines
// which is here a "pseudo"-MCU block.
void Next8Lines(UBYTE c);
//
// Get the next block of eight lines of the image
struct Line *Start8Lines(UBYTE c);
//
public:
//
LineBitmapRequester(class Frame *frame);
//
virtual ~LineBitmapRequester(void);
//
// First time usage: Collect all the information for encoding.
// May throw on out of memory situations
virtual void PrepareForEncoding(void);
//
// First time usage: Collect all the information for decoding.
// May throw on out of memory situations.
virtual void PrepareForDecoding(void);
//
// Return the color transformer responsible for this scan.
class ColorTrafo *ColorTrafoOf(bool encoding,bool disabletorgb);
//
// First step of a region encoder: Find the region that can be pulled in the next step,
// from a rectangle request. This potentially shrinks the rectangle, which should be
// initialized to the full image.
virtual void CropEncodingRegion(RectAngle<LONG> ®ion,const struct RectangleRequest *rr);
//
// Request user data for encoding for the given region, potentially clip the region to the
// data available from the user.
virtual void RequestUserDataForEncoding(class BitMapHook *bmh,RectAngle<LONG> ®ion,bool alpha);
//
// Pull data buffers from the user data bitmap hook
virtual void RequestUserDataForDecoding(class BitMapHook *bmh,RectAngle<LONG> ®ion,
const struct RectangleRequest *rr,bool alpha);
//
// Encode a region, push it into the internal buffers and
// prepare everything for coding.
virtual void EncodeRegion(const RectAngle<LONG> ®ion);
//
// Reconstruct a block, or part of a block
virtual void ReconstructRegion(const RectAngle<LONG> ®ion,const struct RectangleRequest *rr);
//
// Return true if the next MCU line is buffered and can be pushed
// to the encoder.
virtual bool isNextMCULineReady(void) const;
//
// Reset all components on the image side of the control to the
// start of the image. Required when re-requesting the image
// for encoding or decoding.
virtual void ResetToStartOfImage(void);
//
// Return an indicator whether all of the image has been loaded into
// the image buffer.
virtual bool isImageComplete(void) const;
//
// Return true in case this buffer is organized in lines rather
// than blocks.
virtual bool isLineBased(void) const
{
return true;
}
//
// Return the number of lines available for reconstruction from this scan.
virtual ULONG BufferedLines(const struct RectangleRequest *rr) const
{
return LineBuffer::BufferedLines(rr);
}
//
// Post the height of the frame in lines. This happens
// when the DNL marker is processed.
virtual void PostImageHeight(ULONG lines)
{
LineBuffer::PostImageHeight(lines);
BitmapCtrl::PostImageHeight(lines);
m_ulPixelHeight = lines;
}
};
///
///
#endif
|
