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
|
// Copyright 2015 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxcodec/jbig2/JBig2_HtrdProc.h"
#include <algorithm>
#include <utility>
#include "core/fxcodec/jbig2/JBig2_BitStream.h"
#include "core/fxcodec/jbig2/JBig2_GrdProc.h"
#include "core/fxcodec/jbig2/JBig2_Image.h"
#include "third_party/base/ptr_util.h"
std::unique_ptr<CJBig2_Image> CJBig2_HTRDProc::DecodeArith(
CJBig2_ArithDecoder* pArithDecoder,
JBig2ArithCtx* gbContext,
PauseIndicatorIface* pPause) {
std::unique_ptr<CJBig2_Image> HSKIP;
if (HENABLESKIP == 1) {
HSKIP = pdfium::MakeUnique<CJBig2_Image>(HGW, HGH);
for (uint32_t mg = 0; mg < HGH; ++mg) {
for (uint32_t ng = 0; ng < HGW; ++ng) {
int32_t x = (HGX + mg * HRY + ng * HRX) >> 8;
int32_t y = (HGY + mg * HRX - ng * HRY) >> 8;
if ((x + HPW <= 0) | (x >= static_cast<int32_t>(HBW)) | (y + HPH <= 0) |
(y >= static_cast<int32_t>(HPH))) {
HSKIP->setPixel(ng, mg, 1);
} else {
HSKIP->setPixel(ng, mg, 0);
}
}
}
}
uint32_t HBPP = 1;
while (static_cast<uint32_t>(1 << HBPP) < HNUMPATS)
++HBPP;
CJBig2_GRDProc GRD;
GRD.MMR = HMMR;
GRD.GBW = HGW;
GRD.GBH = HGH;
GRD.GBTEMPLATE = HTEMPLATE;
GRD.TPGDON = 0;
GRD.USESKIP = HENABLESKIP;
GRD.SKIP = HSKIP.get();
if (HTEMPLATE <= 1)
GRD.GBAT[0] = 3;
else
GRD.GBAT[0] = 2;
GRD.GBAT[1] = -1;
if (GRD.GBTEMPLATE == 0) {
GRD.GBAT[2] = -3;
GRD.GBAT[3] = -1;
GRD.GBAT[4] = 2;
GRD.GBAT[5] = -2;
GRD.GBAT[6] = -2;
GRD.GBAT[7] = -2;
}
uint8_t GSBPP = static_cast<uint8_t>(HBPP);
std::vector<std::unique_ptr<CJBig2_Image>> GSPLANES(GSBPP);
for (int32_t i = GSBPP - 1; i >= 0; --i) {
std::unique_ptr<CJBig2_Image> pImage;
CJBig2_GRDProc::ProgressiveArithDecodeState state;
state.pImage = &pImage;
state.pArithDecoder = pArithDecoder;
state.gbContext = gbContext;
state.pPause = nullptr;
FXCODEC_STATUS status = GRD.StartDecodeArith(&state);
state.pPause = pPause;
while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE)
status = GRD.ContinueDecode(&state);
if (!pImage)
return nullptr;
GSPLANES[i] = std::move(pImage);
if (i < GSBPP - 1)
GSPLANES[i]->ComposeFrom(0, 0, GSPLANES[i + 1].get(), JBIG2_COMPOSE_XOR);
}
return DecodeImage(GSPLANES);
}
std::unique_ptr<CJBig2_Image> CJBig2_HTRDProc::DecodeMMR(
CJBig2_BitStream* pStream) {
uint32_t HBPP = 1;
while (static_cast<uint32_t>(1 << HBPP) < HNUMPATS)
++HBPP;
CJBig2_GRDProc GRD;
GRD.MMR = HMMR;
GRD.GBW = HGW;
GRD.GBH = HGH;
uint8_t GSBPP = static_cast<uint8_t>(HBPP);
std::vector<std::unique_ptr<CJBig2_Image>> GSPLANES(GSBPP);
GRD.StartDecodeMMR(&GSPLANES[GSBPP - 1], pStream);
if (!GSPLANES[GSBPP - 1])
return nullptr;
pStream->alignByte();
pStream->offset(3);
for (int32_t J = GSBPP - 2; J >= 0; --J) {
GRD.StartDecodeMMR(&GSPLANES[J], pStream);
if (!GSPLANES[J])
return nullptr;
pStream->alignByte();
pStream->offset(3);
GSPLANES[J]->ComposeFrom(0, 0, GSPLANES[J + 1].get(), JBIG2_COMPOSE_XOR);
}
return DecodeImage(GSPLANES);
}
std::unique_ptr<CJBig2_Image> CJBig2_HTRDProc::DecodeImage(
const std::vector<std::unique_ptr<CJBig2_Image>>& GSPLANES) {
auto HTREG = pdfium::MakeUnique<CJBig2_Image>(HBW, HBH);
if (!HTREG->data())
return nullptr;
HTREG->fill(HDEFPIXEL);
for (uint32_t y = 0; y < HGH; ++y) {
for (uint32_t x = 0; x < HGW; ++x) {
uint32_t gsval = 0;
for (uint8_t i = 0; i < GSPLANES.size(); ++i)
gsval |= GSPLANES[i]->getPixel(x, y) << i;
uint32_t pat_index = std::min(gsval, HNUMPATS - 1);
int32_t out_x = (HGX + y * HRY + x * HRX) >> 8;
int32_t out_y = (HGY + y * HRX - x * HRY) >> 8;
(*HPATS)[pat_index]->ComposeTo(HTREG.get(), out_x, out_y, HCOMBOP);
}
}
return HTREG;
}
|
