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 #include "third_party/base/ptr_util.h"
16
DecodeArith(CJBig2_ArithDecoder * pArithDecoder,JBig2ArithCtx * gbContext,PauseIndicatorIface * pPause)17 std::unique_ptr<CJBig2_Image> CJBig2_HTRDProc::DecodeArith(
18 CJBig2_ArithDecoder* pArithDecoder,
19 JBig2ArithCtx* gbContext,
20 PauseIndicatorIface* pPause) {
21 std::unique_ptr<CJBig2_Image> HSKIP;
22 if (HENABLESKIP == 1) {
23 HSKIP = pdfium::MakeUnique<CJBig2_Image>(HGW, HGH);
24 for (uint32_t mg = 0; mg < HGH; ++mg) {
25 for (uint32_t ng = 0; ng < HGW; ++ng) {
26 int32_t x = (HGX + mg * HRY + ng * HRX) >> 8;
27 int32_t y = (HGY + mg * HRX - ng * HRY) >> 8;
28 if ((x + HPW <= 0) | (x >= static_cast<int32_t>(HBW)) | (y + HPH <= 0) |
29 (y >= static_cast<int32_t>(HPH))) {
30 HSKIP->SetPixel(ng, mg, 1);
31 } else {
32 HSKIP->SetPixel(ng, mg, 0);
33 }
34 }
35 }
36 }
37 uint32_t HBPP = 1;
38 while (static_cast<uint32_t>(1 << HBPP) < HNUMPATS)
39 ++HBPP;
40
41 CJBig2_GRDProc GRD;
42 GRD.MMR = HMMR;
43 GRD.GBW = HGW;
44 GRD.GBH = HGH;
45 GRD.GBTEMPLATE = HTEMPLATE;
46 GRD.TPGDON = 0;
47 GRD.USESKIP = HENABLESKIP;
48 GRD.SKIP = HSKIP.get();
49 if (HTEMPLATE <= 1)
50 GRD.GBAT[0] = 3;
51 else
52 GRD.GBAT[0] = 2;
53 GRD.GBAT[1] = -1;
54 if (GRD.GBTEMPLATE == 0) {
55 GRD.GBAT[2] = -3;
56 GRD.GBAT[3] = -1;
57 GRD.GBAT[4] = 2;
58 GRD.GBAT[5] = -2;
59 GRD.GBAT[6] = -2;
60 GRD.GBAT[7] = -2;
61 }
62
63 uint8_t GSBPP = static_cast<uint8_t>(HBPP);
64 std::vector<std::unique_ptr<CJBig2_Image>> GSPLANES(GSBPP);
65 for (int32_t i = GSBPP - 1; i >= 0; --i) {
66 std::unique_ptr<CJBig2_Image> pImage;
67 CJBig2_GRDProc::ProgressiveArithDecodeState state;
68 state.pImage = &pImage;
69 state.pArithDecoder = pArithDecoder;
70 state.gbContext = gbContext;
71 state.pPause = nullptr;
72 FXCODEC_STATUS status = GRD.StartDecodeArith(&state);
73 state.pPause = pPause;
74 while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE)
75 status = GRD.ContinueDecode(&state);
76 if (!pImage)
77 return nullptr;
78
79 GSPLANES[i] = std::move(pImage);
80 if (i < GSBPP - 1)
81 GSPLANES[i]->ComposeFrom(0, 0, GSPLANES[i + 1].get(), JBIG2_COMPOSE_XOR);
82 }
83 return DecodeImage(GSPLANES);
84 }
85
DecodeMMR(CJBig2_BitStream * pStream)86 std::unique_ptr<CJBig2_Image> CJBig2_HTRDProc::DecodeMMR(
87 CJBig2_BitStream* pStream) {
88 uint32_t HBPP = 1;
89 while (static_cast<uint32_t>(1 << HBPP) < HNUMPATS)
90 ++HBPP;
91
92 CJBig2_GRDProc GRD;
93 GRD.MMR = HMMR;
94 GRD.GBW = HGW;
95 GRD.GBH = HGH;
96
97 uint8_t GSBPP = static_cast<uint8_t>(HBPP);
98 std::vector<std::unique_ptr<CJBig2_Image>> GSPLANES(GSBPP);
99 GRD.StartDecodeMMR(&GSPLANES[GSBPP - 1], pStream);
100 if (!GSPLANES[GSBPP - 1])
101 return nullptr;
102
103 pStream->alignByte();
104 pStream->offset(3);
105 for (int32_t J = GSBPP - 2; J >= 0; --J) {
106 GRD.StartDecodeMMR(&GSPLANES[J], pStream);
107 if (!GSPLANES[J])
108 return nullptr;
109
110 pStream->alignByte();
111 pStream->offset(3);
112 GSPLANES[J]->ComposeFrom(0, 0, GSPLANES[J + 1].get(), JBIG2_COMPOSE_XOR);
113 }
114 return DecodeImage(GSPLANES);
115 }
116
DecodeImage(const std::vector<std::unique_ptr<CJBig2_Image>> & GSPLANES)117 std::unique_ptr<CJBig2_Image> CJBig2_HTRDProc::DecodeImage(
118 const std::vector<std::unique_ptr<CJBig2_Image>>& GSPLANES) {
119 auto HTREG = pdfium::MakeUnique<CJBig2_Image>(HBW, HBH);
120 if (!HTREG->data())
121 return nullptr;
122
123 HTREG->Fill(HDEFPIXEL);
124 for (uint32_t y = 0; y < HGH; ++y) {
125 for (uint32_t x = 0; x < HGW; ++x) {
126 uint32_t gsval = 0;
127 for (uint8_t i = 0; i < GSPLANES.size(); ++i)
128 gsval |= GSPLANES[i]->GetPixel(x, y) << i;
129 uint32_t pat_index = std::min(gsval, HNUMPATS - 1);
130 int32_t out_x = (HGX + y * HRY + x * HRX) >> 8;
131 int32_t out_y = (HGY + y * HRX - x * HRY) >> 8;
132 (*HPATS)[pat_index]->ComposeTo(HTREG.get(), out_x, out_y, HCOMBOP);
133 }
134 }
135 return HTREG;
136 }
137