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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 <memory>
#include "core/fxcodec/jbig2/JBig2_GsidProc.h"
#include "core/fxcrt/fx_basic.h"
#include "third_party/base/ptr_util.h"
CJBig2_Image* CJBig2_HTRDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
JBig2ArithCtx* gbContext,
IFX_Pause* pPause) {
uint32_t ng, mg;
int32_t x, y;
uint32_t HBPP;
uint32_t* GI;
std::unique_ptr<CJBig2_Image> HSKIP;
auto HTREG = pdfium::MakeUnique<CJBig2_Image>(HBW, HBH);
HTREG->fill(HDEFPIXEL);
if (HENABLESKIP == 1) {
HSKIP = pdfium::MakeUnique<CJBig2_Image>(HGW, HGH);
for (mg = 0; mg < HGH; mg++) {
for (ng = 0; ng < HGW; ng++) {
x = (HGX + mg * HRY + ng * HRX) >> 8;
y = (HGY + mg * HRX - ng * HRY) >> 8;
if ((x + HPW <= 0) | (x >= (int32_t)HBW) | (y + HPH <= 0) |
(y >= (int32_t)HPH)) {
HSKIP->setPixel(ng, mg, 1);
} else {
HSKIP->setPixel(ng, mg, 0);
}
}
}
}
HBPP = 1;
while ((uint32_t)(1 << HBPP) < HNUMPATS) {
HBPP++;
}
auto pGID = pdfium::MakeUnique<CJBig2_GSIDProc>();
pGID->GSMMR = HMMR;
pGID->GSW = HGW;
pGID->GSH = HGH;
pGID->GSBPP = (uint8_t)HBPP;
pGID->GSUSESKIP = HENABLESKIP;
pGID->GSKIP = HSKIP.get();
pGID->GSTEMPLATE = HTEMPLATE;
GI = pGID->decode_Arith(pArithDecoder, gbContext, pPause);
if (!GI)
return nullptr;
for (mg = 0; mg < HGH; mg++) {
for (ng = 0; ng < HGW; ng++) {
x = (HGX + mg * HRY + ng * HRX) >> 8;
y = (HGY + mg * HRX - ng * HRY) >> 8;
uint32_t pat_index = GI[mg * HGW + ng];
if (pat_index >= HNUMPATS) {
pat_index = HNUMPATS - 1;
}
HTREG->composeFrom(x, y, HPATS[pat_index], HCOMBOP);
}
}
FX_Free(GI);
return HTREG.release();
}
CJBig2_Image* CJBig2_HTRDProc::decode_MMR(CJBig2_BitStream* pStream) {
uint32_t ng, mg;
int32_t x, y;
uint32_t* GI;
auto HTREG = pdfium::MakeUnique<CJBig2_Image>(HBW, HBH);
HTREG->fill(HDEFPIXEL);
uint32_t HBPP = 1;
while ((uint32_t)(1 << HBPP) < HNUMPATS) {
HBPP++;
}
auto pGID = pdfium::MakeUnique<CJBig2_GSIDProc>();
pGID->GSMMR = HMMR;
pGID->GSW = HGW;
pGID->GSH = HGH;
pGID->GSBPP = (uint8_t)HBPP;
pGID->GSUSESKIP = 0;
GI = pGID->decode_MMR(pStream);
if (!GI)
return nullptr;
for (mg = 0; mg < HGH; mg++) {
for (ng = 0; ng < HGW; ng++) {
x = (HGX + mg * HRY + ng * HRX) >> 8;
y = (HGY + mg * HRX - ng * HRY) >> 8;
uint32_t pat_index = GI[mg * HGW + ng];
if (pat_index >= HNUMPATS) {
pat_index = HNUMPATS - 1;
}
HTREG->composeFrom(x, y, HPATS[pat_index], HCOMBOP);
}
}
FX_Free(GI);
return HTREG.release();
}
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