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// 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;
FXCODEC_STATUS status =
GRD.StartDecodeArith(&pImage, pArithDecoder, gbContext, nullptr);
while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE)
status = GRD.ContinueDecode(pPause, pArithDecoder);
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);
HTREG->fill(HDEFPIXEL);
std::vector<uint32_t> GSVALS(HGW * HGH);
for (uint32_t y = 0; y < HGH; ++y) {
for (uint32_t x = 0; x < HGW; ++x) {
for (uint8_t J = 0; J < GSPLANES.size(); ++J)
GSVALS[y * HGW + x] |= GSPLANES[J]->getPixel(x, y) << J;
}
}
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;
uint32_t pat_index = std::min(GSVALS[mg * HGW + ng], HNUMPATS - 1);
HTREG->composeFrom(x, y, (*HPATS)[pat_index].get(), HCOMBOP);
}
}
return HTREG;
}
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