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pdfium / pdfium / refs/heads/chromium/2692 / . / core / fxcodec / jbig2 / JBig2_GrrdProc.cpp
blob: 17d17d558e0ab89065ed500391fe2448702fb1b4 [file] [log] [blame]
// 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_GrrdProc.h"
#include <memory>
#include "core/fxcodec/jbig2/JBig2_ArithDecoder.h"
#include "core/fxcodec/jbig2/JBig2_BitStream.h"
#include "core/fxcodec/jbig2/JBig2_Image.h"
CJBig2_Image* CJBig2_GRRDProc::decode(CJBig2_ArithDecoder* pArithDecoder,
JBig2ArithCtx* grContext) {
if (GRW == 0 || GRH == 0)
return new CJBig2_Image(GRW, GRH);
if (GRTEMPLATE == 0) {
if ((GRAT[0] == -1) && (GRAT[1] == -1) && (GRAT[2] == -1) &&
(GRAT[3] == -1) && (GRREFERENCEDX == 0) &&
(GRW == (uint32_t)GRREFERENCE->m_nWidth)) {
return decode_Template0_opt(pArithDecoder, grContext);
}
return decode_Template0_unopt(pArithDecoder, grContext);
}
if ((GRREFERENCEDX == 0) && (GRW == (uint32_t)GRREFERENCE->m_nWidth))
return decode_Template1_opt(pArithDecoder, grContext);
return decode_Template1_unopt(pArithDecoder, grContext);
}
CJBig2_Image* CJBig2_GRRDProc::decode_Template0_unopt(
CJBig2_ArithDecoder* pArithDecoder,
JBig2ArithCtx* grContext) {
FX_BOOL LTP, SLTP, bVal;
uint32_t CONTEXT;
uint32_t line1, line2, line3, line4, line5;
LTP = 0;
std::unique_ptr<CJBig2_Image> GRREG(new CJBig2_Image(GRW, GRH));
GRREG->fill(0);
for (uint32_t h = 0; h < GRH; h++) {
if (TPGRON) {
SLTP = pArithDecoder->DECODE(&grContext[0x0010]);
LTP = LTP ^ SLTP;
}
if (LTP == 0) {
line1 = GRREG->getPixel(1, h - 1);
line1 |= GRREG->getPixel(0, h - 1) << 1;
line2 = 0;
line3 = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY - 1);
line3 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1)
<< 1;
line4 = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
<< 2;
line5 = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
<< 1;
line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY + 1)
<< 2;
for (uint32_t w = 0; w < GRW; w++) {
CONTEXT = line5;
CONTEXT |= line4 << 3;
CONTEXT |= line3 << 6;
CONTEXT |= GRREFERENCE->getPixel(w - GRREFERENCEDX + GRAT[2],
h - GRREFERENCEDY + GRAT[3])
<< 8;
CONTEXT |= line2 << 9;
CONTEXT |= line1 << 10;
CONTEXT |= GRREG->getPixel(w + GRAT[0], h + GRAT[1]) << 12;
bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
GRREG->setPixel(w, h, bVal);
line1 = ((line1 << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x03;
line2 = ((line2 << 1) | bVal) & 0x01;
line3 = ((line3 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
h - GRREFERENCEDY - 1)) &
0x03;
line4 =
((line4 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
0x07;
line5 = ((line5 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
h - GRREFERENCEDY + 1)) &
0x07;
}
} else {
line1 = GRREG->getPixel(1, h - 1);
line1 |= GRREG->getPixel(0, h - 1) << 1;
line2 = 0;
line3 = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY - 1);
line3 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1)
<< 1;
line4 = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
<< 2;
line5 = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
<< 1;
line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY + 1)
<< 2;
for (uint32_t w = 0; w < GRW; w++) {
bVal = GRREFERENCE->getPixel(w, h);
if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w - 1, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w + 1, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w - 1, h)) &&
(bVal == GRREFERENCE->getPixel(w + 1, h)) &&
(bVal == GRREFERENCE->getPixel(w - 1, h + 1)) &&
(bVal == GRREFERENCE->getPixel(w, h + 1)) &&
(bVal == GRREFERENCE->getPixel(w + 1, h + 1)))) {
CONTEXT = line5;
CONTEXT |= line4 << 3;
CONTEXT |= line3 << 6;
CONTEXT |= GRREFERENCE->getPixel(w - GRREFERENCEDX + GRAT[2],
h - GRREFERENCEDY + GRAT[3])
<< 8;
CONTEXT |= line2 << 9;
CONTEXT |= line1 << 10;
CONTEXT |= GRREG->getPixel(w + GRAT[0], h + GRAT[1]) << 12;
bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
}
GRREG->setPixel(w, h, bVal);
line1 = ((line1 << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x03;
line2 = ((line2 << 1) | bVal) & 0x01;
line3 = ((line3 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
h - GRREFERENCEDY - 1)) &
0x03;
line4 =
((line4 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
0x07;
line5 = ((line5 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
h - GRREFERENCEDY + 1)) &
0x07;
}
}
}
return GRREG.release();
}
CJBig2_Image* CJBig2_GRRDProc::decode_Template0_opt(
CJBig2_ArithDecoder* pArithDecoder,
JBig2ArithCtx* grContext) {
if (!GRREFERENCE->m_pData)
return nullptr;
FX_BOOL LTP, SLTP, bVal;
uint32_t CONTEXT;
uint32_t line1, line1_r, line2_r, line3_r;
uint8_t *pLine, *pLineR, cVal;
intptr_t nStride, nStrideR, nOffset;
int32_t k, nBits;
int32_t GRWR, GRHR;
int32_t GRW, GRH;
GRW = (int32_t)CJBig2_GRRDProc::GRW;
GRH = (int32_t)CJBig2_GRRDProc::GRH;
LTP = 0;
std::unique_ptr<CJBig2_Image> GRREG(new CJBig2_Image(GRW, GRH));
if (!GRREG->m_pData)
return nullptr;
pLine = GRREG->m_pData;
pLineR = GRREFERENCE->m_pData;
nStride = GRREG->m_nStride;
nStrideR = GRREFERENCE->m_nStride;
GRWR = (int32_t)GRREFERENCE->m_nWidth;
GRHR = (int32_t)GRREFERENCE->m_nHeight;
if (GRREFERENCEDY < -GRHR + 1 || GRREFERENCEDY > GRHR - 1) {
GRREFERENCEDY = 0;
}
nOffset = -GRREFERENCEDY * nStrideR;
for (int32_t h = 0; h < GRH; h++) {
if (TPGRON) {
SLTP = pArithDecoder->DECODE(&grContext[0x0010]);
LTP = LTP ^ SLTP;
}
line1 = (h > 0) ? pLine[-nStride] << 4 : 0;
int32_t reference_h = h - GRREFERENCEDY;
FX_BOOL line1_r_ok = (reference_h > 0 && reference_h < GRHR + 1);
FX_BOOL line2_r_ok = (reference_h > -1 && reference_h < GRHR);
FX_BOOL line3_r_ok = (reference_h > -2 && reference_h < GRHR - 1);
line1_r = line1_r_ok ? pLineR[nOffset - nStrideR] : 0;
line2_r = line2_r_ok ? pLineR[nOffset] : 0;
line3_r = line3_r_ok ? pLineR[nOffset + nStrideR] : 0;
if (LTP == 0) {
CONTEXT = (line1 & 0x1c00) | (line1_r & 0x01c0) |
((line2_r >> 3) & 0x0038) | ((line3_r >> 6) & 0x0007);
for (int32_t w = 0; w < GRW; w += 8) {
nBits = GRW - w > 8 ? 8 : GRW - w;
if (h > 0)
line1 = (line1 << 8) |
(w + 8 < GRW ? pLine[-nStride + (w >> 3) + 1] << 4 : 0);
if (h > GRHR + GRREFERENCEDY + 1) {
line1_r = 0;
line2_r = 0;
line3_r = 0;
} else {
if (line1_r_ok)
line1_r =
(line1_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
if (line2_r_ok)
line2_r = (line2_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
if (line3_r_ok) {
line3_r =
(line3_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
} else {
line3_r = 0;
}
}
cVal = 0;
for (k = 0; k < nBits; k++) {
bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
cVal |= bVal << (7 - k);
CONTEXT = ((CONTEXT & 0x0cdb) << 1) | (bVal << 9) |
((line1 >> (7 - k)) & 0x0400) |
((line1_r >> (7 - k)) & 0x0040) |
((line2_r >> (10 - k)) & 0x0008) |
((line3_r >> (13 - k)) & 0x0001);
}
pLine[w >> 3] = cVal;
}
} else {
CONTEXT = (line1 & 0x1c00) | (line1_r & 0x01c0) |
((line2_r >> 3) & 0x0038) | ((line3_r >> 6) & 0x0007);
for (int32_t w = 0; w < GRW; w += 8) {
nBits = GRW - w > 8 ? 8 : GRW - w;
if (h > 0)
line1 = (line1 << 8) |
(w + 8 < GRW ? pLine[-nStride + (w >> 3) + 1] << 4 : 0);
if (line1_r_ok)
line1_r =
(line1_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
if (line2_r_ok)
line2_r = (line2_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
if (line3_r_ok) {
line3_r =
(line3_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
} else {
line3_r = 0;
}
cVal = 0;
for (k = 0; k < nBits; k++) {
bVal = GRREFERENCE->getPixel(w + k, h);
if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w + k - 1, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w + k, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w + k + 1, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w + k - 1, h)) &&
(bVal == GRREFERENCE->getPixel(w + k + 1, h)) &&
(bVal == GRREFERENCE->getPixel(w + k - 1, h + 1)) &&
(bVal == GRREFERENCE->getPixel(w + k, h + 1)) &&
(bVal == GRREFERENCE->getPixel(w + k + 1, h + 1)))) {
bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
}
cVal |= bVal << (7 - k);
CONTEXT = ((CONTEXT & 0x0cdb) << 1) | (bVal << 9) |
((line1 >> (7 - k)) & 0x0400) |
((line1_r >> (7 - k)) & 0x0040) |
((line2_r >> (10 - k)) & 0x0008) |
((line3_r >> (13 - k)) & 0x0001);
}
pLine[w >> 3] = cVal;
}
}
pLine += nStride;
if (h < GRHR + GRREFERENCEDY) {
pLineR += nStrideR;
}
}
return GRREG.release();
}
CJBig2_Image* CJBig2_GRRDProc::decode_Template1_unopt(
CJBig2_ArithDecoder* pArithDecoder,
JBig2ArithCtx* grContext) {
FX_BOOL LTP, SLTP, bVal;
uint32_t CONTEXT;
uint32_t line1, line2, line3, line4, line5;
LTP = 0;
std::unique_ptr<CJBig2_Image> GRREG(new CJBig2_Image(GRW, GRH));
GRREG->fill(0);
for (uint32_t h = 0; h < GRH; h++) {
if (TPGRON) {
SLTP = pArithDecoder->DECODE(&grContext[0x0008]);
LTP = LTP ^ SLTP;
}
if (LTP == 0) {
line1 = GRREG->getPixel(1, h - 1);
line1 |= GRREG->getPixel(0, h - 1) << 1;
line1 |= GRREG->getPixel(-1, h - 1) << 2;
line2 = 0;
line3 = GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1);
line4 = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
<< 2;
line5 = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
<< 1;
for (uint32_t w = 0; w < GRW; w++) {
CONTEXT = line5;
CONTEXT |= line4 << 2;
CONTEXT |= line3 << 5;
CONTEXT |= line2 << 6;
CONTEXT |= line1 << 7;
bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
GRREG->setPixel(w, h, bVal);
line1 = ((line1 << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x07;
line2 = ((line2 << 1) | bVal) & 0x01;
line3 = ((line3 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 1,
h - GRREFERENCEDY - 1)) &
0x01;
line4 =
((line4 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
0x07;
line5 = ((line5 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
h - GRREFERENCEDY + 1)) &
0x03;
}
} else {
line1 = GRREG->getPixel(1, h - 1);
line1 |= GRREG->getPixel(0, h - 1) << 1;
line1 |= GRREG->getPixel(-1, h - 1) << 2;
line2 = 0;
line3 = GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1);
line4 = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
<< 2;
line5 = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
<< 1;
for (uint32_t w = 0; w < GRW; w++) {
bVal = GRREFERENCE->getPixel(w, h);
if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w - 1, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w + 1, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w - 1, h)) &&
(bVal == GRREFERENCE->getPixel(w + 1, h)) &&
(bVal == GRREFERENCE->getPixel(w - 1, h + 1)) &&
(bVal == GRREFERENCE->getPixel(w, h + 1)) &&
(bVal == GRREFERENCE->getPixel(w + 1, h + 1)))) {
CONTEXT = line5;
CONTEXT |= line4 << 2;
CONTEXT |= line3 << 5;
CONTEXT |= line2 << 6;
CONTEXT |= line1 << 7;
bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
}
GRREG->setPixel(w, h, bVal);
line1 = ((line1 << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x07;
line2 = ((line2 << 1) | bVal) & 0x01;
line3 = ((line3 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 1,
h - GRREFERENCEDY - 1)) &
0x01;
line4 =
((line4 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
0x07;
line5 = ((line5 << 1) |
GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
h - GRREFERENCEDY + 1)) &
0x03;
}
}
}
return GRREG.release();
}
CJBig2_Image* CJBig2_GRRDProc::decode_Template1_opt(
CJBig2_ArithDecoder* pArithDecoder,
JBig2ArithCtx* grContext) {
if (!GRREFERENCE->m_pData)
return nullptr;
FX_BOOL LTP, SLTP, bVal;
uint32_t CONTEXT;
uint32_t line1, line1_r, line2_r, line3_r;
uint8_t *pLine, *pLineR, cVal;
intptr_t nStride, nStrideR, nOffset;
int32_t k, nBits;
int32_t GRWR, GRHR;
int32_t GRW, GRH;
GRW = (int32_t)CJBig2_GRRDProc::GRW;
GRH = (int32_t)CJBig2_GRRDProc::GRH;
LTP = 0;
std::unique_ptr<CJBig2_Image> GRREG(new CJBig2_Image(GRW, GRH));
if (!GRREG->m_pData)
return nullptr;
pLine = GRREG->m_pData;
pLineR = GRREFERENCE->m_pData;
nStride = GRREG->m_nStride;
nStrideR = GRREFERENCE->m_nStride;
GRWR = (int32_t)GRREFERENCE->m_nWidth;
GRHR = (int32_t)GRREFERENCE->m_nHeight;
if (GRREFERENCEDY < -GRHR + 1 || GRREFERENCEDY > GRHR - 1) {
GRREFERENCEDY = 0;
}
nOffset = -GRREFERENCEDY * nStrideR;
for (int32_t h = 0; h < GRH; h++) {
if (TPGRON) {
SLTP = pArithDecoder->DECODE(&grContext[0x0008]);
LTP = LTP ^ SLTP;
}
line1 = (h > 0) ? pLine[-nStride] << 1 : 0;
int32_t reference_h = h - GRREFERENCEDY;
FX_BOOL line1_r_ok = (reference_h > 0 && reference_h < GRHR + 1);
FX_BOOL line2_r_ok = (reference_h > -1 && reference_h < GRHR);
FX_BOOL line3_r_ok = (reference_h > -2 && reference_h < GRHR - 1);
line1_r = line1_r_ok ? pLineR[nOffset - nStrideR] : 0;
line2_r = line2_r_ok ? pLineR[nOffset] : 0;
line3_r = line3_r_ok ? pLineR[nOffset + nStrideR] : 0;
if (LTP == 0) {
CONTEXT = (line1 & 0x0380) | ((line1_r >> 2) & 0x0020) |
((line2_r >> 4) & 0x001c) | ((line3_r >> 6) & 0x0003);
for (int32_t w = 0; w < GRW; w += 8) {
nBits = GRW - w > 8 ? 8 : GRW - w;
if (h > 0)
line1 = (line1 << 8) |
(w + 8 < GRW ? pLine[-nStride + (w >> 3) + 1] << 1 : 0);
if (line1_r_ok)
line1_r =
(line1_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
if (line2_r_ok)
line2_r = (line2_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
if (line3_r_ok) {
line3_r =
(line3_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
} else {
line3_r = 0;
}
cVal = 0;
for (k = 0; k < nBits; k++) {
bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
cVal |= bVal << (7 - k);
CONTEXT = ((CONTEXT & 0x018d) << 1) | (bVal << 6) |
((line1 >> (7 - k)) & 0x0080) |
((line1_r >> (9 - k)) & 0x0020) |
((line2_r >> (11 - k)) & 0x0004) |
((line3_r >> (13 - k)) & 0x0001);
}
pLine[w >> 3] = cVal;
}
} else {
CONTEXT = (line1 & 0x0380) | ((line1_r >> 2) & 0x0020) |
((line2_r >> 4) & 0x001c) | ((line3_r >> 6) & 0x0003);
for (int32_t w = 0; w < GRW; w += 8) {
nBits = GRW - w > 8 ? 8 : GRW - w;
if (h > 0)
line1 = (line1 << 8) |
(w + 8 < GRW ? pLine[-nStride + (w >> 3) + 1] << 1 : 0);
if (line1_r_ok)
line1_r =
(line1_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
if (line2_r_ok)
line2_r = (line2_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
if (line3_r_ok) {
line3_r =
(line3_r << 8) |
(w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
} else {
line3_r = 0;
}
cVal = 0;
for (k = 0; k < nBits; k++) {
bVal = GRREFERENCE->getPixel(w + k, h);
if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w + k - 1, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w + k, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w + k + 1, h - 1)) &&
(bVal == GRREFERENCE->getPixel(w + k - 1, h)) &&
(bVal == GRREFERENCE->getPixel(w + k + 1, h)) &&
(bVal == GRREFERENCE->getPixel(w + k - 1, h + 1)) &&
(bVal == GRREFERENCE->getPixel(w + k, h + 1)) &&
(bVal == GRREFERENCE->getPixel(w + k + 1, h + 1)))) {
bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
}
cVal |= bVal << (7 - k);
CONTEXT = ((CONTEXT & 0x018d) << 1) | (bVal << 6) |
((line1 >> (7 - k)) & 0x0080) |
((line1_r >> (9 - k)) & 0x0020) |
((line2_r >> (11 - k)) & 0x0004) |
((line3_r >> (13 - k)) & 0x0001);
}
pLine[w >> 3] = cVal;
}
}
pLine += nStride;
if (h < GRHR + GRREFERENCEDY) {
pLineR += nStrideR;
}
}
return GRREG.release();
}