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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_GsidProc.h"
#include <memory>
#include <utility>
#include <vector>
#include "core/fxcodec/jbig2/JBig2_BitStream.h"
#include "core/fxcodec/jbig2/JBig2_GrdProc.h"
#include "core/fxcodec/jbig2/JBig2_Image.h"
#include "core/fxcrt/fx_basic.h"
#include "third_party/base/ptr_util.h"
uint32_t* CJBig2_GSIDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
JBig2ArithCtx* gbContext,
IFX_Pause* pPause) {
auto pGRD = pdfium::MakeUnique<CJBig2_GRDProc>();
pGRD->MMR = GSMMR;
pGRD->GBW = GSW;
pGRD->GBH = GSH;
pGRD->GBTEMPLATE = GSTEMPLATE;
pGRD->TPGDON = 0;
pGRD->USESKIP = GSUSESKIP;
pGRD->SKIP = GSKIP;
if (GSTEMPLATE <= 1) {
pGRD->GBAT[0] = 3;
} else {
pGRD->GBAT[0] = 2;
}
pGRD->GBAT[1] = -1;
if (pGRD->GBTEMPLATE == 0) {
pGRD->GBAT[2] = -3;
pGRD->GBAT[3] = -1;
pGRD->GBAT[4] = 2;
pGRD->GBAT[5] = -2;
pGRD->GBAT[6] = -2;
pGRD->GBAT[7] = -2;
}
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 =
pGRD->Start_decode_Arith(&pImage, pArithDecoder, gbContext, nullptr);
while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE)
status = pGRD->Continue_decode(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);
}
std::unique_ptr<uint32_t, FxFreeDeleter> GSVALS(
FX_Alloc2D(uint32_t, GSW, GSH));
JBIG2_memset(GSVALS.get(), 0, sizeof(uint32_t) * GSW * GSH);
for (uint32_t y = 0; y < GSH; ++y) {
for (uint32_t x = 0; x < GSW; ++x) {
for (int32_t i = 0; i < GSBPP; ++i)
GSVALS.get()[y * GSW + x] |= GSPLANES[i]->getPixel(x, y) << i;
}
}
return GSVALS.release();
}
uint32_t* CJBig2_GSIDProc::decode_MMR(CJBig2_BitStream* pStream) {
auto pGRD = pdfium::MakeUnique<CJBig2_GRDProc>();
pGRD->MMR = GSMMR;
pGRD->GBW = GSW;
pGRD->GBH = GSH;
std::vector<std::unique_ptr<CJBig2_Image>> GSPLANES(GSBPP);
pGRD->Start_decode_MMR(&GSPLANES[GSBPP - 1], pStream);
if (!GSPLANES[GSBPP - 1])
return nullptr;
pStream->alignByte();
pStream->offset(3);
int32_t J = GSBPP - 2;
while (J >= 0) {
pGRD->Start_decode_MMR(&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);
J = J - 1;
}
std::unique_ptr<uint32_t> GSVALS(FX_Alloc2D(uint32_t, GSW, GSH));
JBIG2_memset(GSVALS.get(), 0, sizeof(uint32_t) * GSW * GSH);
for (uint32_t y = 0; y < GSH; ++y) {
for (uint32_t x = 0; x < GSW; ++x) {
for (J = 0; J < GSBPP; ++J) {
GSVALS.get()[y * GSW + x] |= GSPLANES[J]->getPixel(x, y) << J;
}
}
}
return GSVALS.release();
}
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