1 // Copyright 2015 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6
7 #include "core/fxcodec/jbig2/JBig2_HtrdProc.h"
8
9 #include <algorithm>
10 #include <utility>
11
12 #include "core/fxcodec/jbig2/JBig2_BitStream.h"
13 #include "core/fxcodec/jbig2/JBig2_GrdProc.h"
14 #include "core/fxcodec/jbig2/JBig2_Image.h"
15
DecodeArith(CJBig2_ArithDecoder * pArithDecoder,JBig2ArithCtx * gbContext,PauseIndicatorIface * pPause)16 std::unique_ptr<CJBig2_Image> CJBig2_HTRDProc::DecodeArith(
17 CJBig2_ArithDecoder* pArithDecoder,
18 JBig2ArithCtx* gbContext,
19 PauseIndicatorIface* pPause) {
20 std::unique_ptr<CJBig2_Image> HSKIP;
21 if (HENABLESKIP == 1) {
22 HSKIP = std::make_unique<CJBig2_Image>(HGW, HGH);
23 for (uint32_t mg = 0; mg < HGH; ++mg) {
24 for (uint32_t ng = 0; ng < HGW; ++ng) {
25 int32_t x = (HGX + mg * HRY + ng * HRX) >> 8;
26 int32_t y = (HGY + mg * HRX - ng * HRY) >> 8;
27 if ((x + HPW <= 0) | (x >= static_cast<int32_t>(HBW)) | (y + HPH <= 0) |
28 (y >= static_cast<int32_t>(HPH))) {
29 HSKIP->SetPixel(ng, mg, 1);
30 } else {
31 HSKIP->SetPixel(ng, mg, 0);
32 }
33 }
34 }
35 }
36 uint32_t HBPP = 1;
37 while (static_cast<uint32_t>(1 << HBPP) < HNUMPATS)
38 ++HBPP;
39
40 CJBig2_GRDProc GRD;
41 GRD.MMR = HMMR;
42 GRD.GBW = HGW;
43 GRD.GBH = HGH;
44 GRD.GBTEMPLATE = HTEMPLATE;
45 GRD.TPGDON = 0;
46 GRD.USESKIP = HENABLESKIP;
47 GRD.SKIP = HSKIP.get();
48 if (HTEMPLATE <= 1)
49 GRD.GBAT[0] = 3;
50 else
51 GRD.GBAT[0] = 2;
52 GRD.GBAT[1] = -1;
53 if (GRD.GBTEMPLATE == 0) {
54 GRD.GBAT[2] = -3;
55 GRD.GBAT[3] = -1;
56 GRD.GBAT[4] = 2;
57 GRD.GBAT[5] = -2;
58 GRD.GBAT[6] = -2;
59 GRD.GBAT[7] = -2;
60 }
61
62 uint8_t GSBPP = static_cast<uint8_t>(HBPP);
63 std::vector<std::unique_ptr<CJBig2_Image>> GSPLANES(GSBPP);
64 for (int32_t i = GSBPP - 1; i >= 0; --i) {
65 std::unique_ptr<CJBig2_Image> pImage;
66 CJBig2_GRDProc::ProgressiveArithDecodeState state;
67 state.pImage = &pImage;
68 state.pArithDecoder = pArithDecoder;
69 state.gbContext = gbContext;
70 state.pPause = nullptr;
71 FXCODEC_STATUS status = GRD.StartDecodeArith(&state);
72 state.pPause = pPause;
73 while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE)
74 status = GRD.ContinueDecode(&state);
75 if (!pImage)
76 return nullptr;
77
78 GSPLANES[i] = std::move(pImage);
79 if (i < GSBPP - 1)
80 GSPLANES[i]->ComposeFrom(0, 0, GSPLANES[i + 1].get(), JBIG2_COMPOSE_XOR);
81 }
82 return DecodeImage(GSPLANES);
83 }
84
DecodeMMR(CJBig2_BitStream * pStream)85 std::unique_ptr<CJBig2_Image> CJBig2_HTRDProc::DecodeMMR(
86 CJBig2_BitStream* pStream) {
87 uint32_t HBPP = 1;
88 while (static_cast<uint32_t>(1 << HBPP) < HNUMPATS)
89 ++HBPP;
90
91 CJBig2_GRDProc GRD;
92 GRD.MMR = HMMR;
93 GRD.GBW = HGW;
94 GRD.GBH = HGH;
95
96 uint8_t GSBPP = static_cast<uint8_t>(HBPP);
97 std::vector<std::unique_ptr<CJBig2_Image>> GSPLANES(GSBPP);
98 GRD.StartDecodeMMR(&GSPLANES[GSBPP - 1], pStream);
99 if (!GSPLANES[GSBPP - 1])
100 return nullptr;
101
102 pStream->alignByte();
103 pStream->offset(3);
104 for (int32_t J = GSBPP - 2; J >= 0; --J) {
105 GRD.StartDecodeMMR(&GSPLANES[J], pStream);
106 if (!GSPLANES[J])
107 return nullptr;
108
109 pStream->alignByte();
110 pStream->offset(3);
111 GSPLANES[J]->ComposeFrom(0, 0, GSPLANES[J + 1].get(), JBIG2_COMPOSE_XOR);
112 }
113 return DecodeImage(GSPLANES);
114 }
115
DecodeImage(const std::vector<std::unique_ptr<CJBig2_Image>> & GSPLANES)116 std::unique_ptr<CJBig2_Image> CJBig2_HTRDProc::DecodeImage(
117 const std::vector<std::unique_ptr<CJBig2_Image>>& GSPLANES) {
118 auto HTREG = std::make_unique<CJBig2_Image>(HBW, HBH);
119 if (!HTREG->data())
120 return nullptr;
121
122 HTREG->Fill(HDEFPIXEL);
123 for (uint32_t y = 0; y < HGH; ++y) {
124 for (uint32_t x = 0; x < HGW; ++x) {
125 uint32_t gsval = 0;
126 for (uint8_t i = 0; i < GSPLANES.size(); ++i)
127 gsval |= GSPLANES[i]->GetPixel(x, y) << i;
128 uint32_t pat_index = std::min(gsval, HNUMPATS - 1);
129 int32_t out_x = (HGX + y * HRY + x * HRX) >> 8;
130 int32_t out_y = (HGY + y * HRX - x * HRY) >> 8;
131 (*HPATS)[pat_index]->ComposeTo(HTREG.get(), out_x, out_y, HCOMBOP);
132 }
133 }
134 return HTREG;
135 }
136