// Copyright 2015 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fxcodec/jbig2/JBig2_GrrdProc.h"
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#include <memory>
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#include "core/fxcodec/jbig2/JBig2_ArithDecoder.h"
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#include "core/fxcodec/jbig2/JBig2_BitStream.h"
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#include "core/fxcodec/jbig2/JBig2_Image.h"
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CJBig2_Image* CJBig2_GRRDProc::decode(CJBig2_ArithDecoder* pArithDecoder,
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JBig2ArithCtx* grContext) {
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if (GRW == 0 || GRH == 0)
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return new CJBig2_Image(GRW, GRH);
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if (GRTEMPLATE == 0) {
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if ((GRAT[0] == -1) && (GRAT[1] == -1) && (GRAT[2] == -1) &&
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(GRAT[3] == -1) && (GRREFERENCEDX == 0) &&
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(GRW == (uint32_t)GRREFERENCE->m_nWidth)) {
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return decode_Template0_opt(pArithDecoder, grContext);
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}
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return decode_Template0_unopt(pArithDecoder, grContext);
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}
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if ((GRREFERENCEDX == 0) && (GRW == (uint32_t)GRREFERENCE->m_nWidth))
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return decode_Template1_opt(pArithDecoder, grContext);
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return decode_Template1_unopt(pArithDecoder, grContext);
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}
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CJBig2_Image* CJBig2_GRRDProc::decode_Template0_unopt(
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CJBig2_ArithDecoder* pArithDecoder,
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JBig2ArithCtx* grContext) {
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FX_BOOL LTP = FALSE;
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std::unique_ptr<CJBig2_Image> GRREG(new CJBig2_Image(GRW, GRH));
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GRREG->fill(0);
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for (uint32_t h = 0; h < GRH; h++) {
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if (TPGRON)
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LTP = LTP ^ pArithDecoder->DECODE(&grContext[0x0010]);
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if (!LTP) {
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uint32_t line1 = GRREG->getPixel(1, h - 1);
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line1 |= GRREG->getPixel(0, h - 1) << 1;
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uint32_t line2 = 0;
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uint32_t line3 =
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GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY - 1);
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line3 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1)
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<< 1;
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uint32_t line4 =
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GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
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line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
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line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
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<< 2;
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uint32_t line5 =
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GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
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line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
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<< 1;
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line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY + 1)
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<< 2;
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for (uint32_t w = 0; w < GRW; w++) {
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uint32_t CONTEXT = line5;
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CONTEXT |= line4 << 3;
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CONTEXT |= line3 << 6;
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CONTEXT |= GRREFERENCE->getPixel(w - GRREFERENCEDX + GRAT[2],
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h - GRREFERENCEDY + GRAT[3])
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<< 8;
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CONTEXT |= line2 << 9;
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CONTEXT |= line1 << 10;
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CONTEXT |= GRREG->getPixel(w + GRAT[0], h + GRAT[1]) << 12;
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FX_BOOL bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
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GRREG->setPixel(w, h, bVal);
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line1 = ((line1 << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x03;
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line2 = ((line2 << 1) | bVal) & 0x01;
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line3 = ((line3 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
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h - GRREFERENCEDY - 1)) &
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0x03;
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line4 =
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((line4 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
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0x07;
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line5 = ((line5 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
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h - GRREFERENCEDY + 1)) &
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0x07;
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}
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} else {
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uint32_t line1 = GRREG->getPixel(1, h - 1);
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line1 |= GRREG->getPixel(0, h - 1) << 1;
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uint32_t line2 = 0;
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uint32_t line3 =
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GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY - 1);
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line3 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1)
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<< 1;
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uint32_t line4 =
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GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
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line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
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line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
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<< 2;
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uint32_t line5 =
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GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
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line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
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<< 1;
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line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY + 1)
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<< 2;
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for (uint32_t w = 0; w < GRW; w++) {
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FX_BOOL bVal = GRREFERENCE->getPixel(w, h);
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if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w - 1, h - 1)) &&
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(bVal == GRREFERENCE->getPixel(w, h - 1)) &&
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(bVal == GRREFERENCE->getPixel(w + 1, h - 1)) &&
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(bVal == GRREFERENCE->getPixel(w - 1, h)) &&
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(bVal == GRREFERENCE->getPixel(w + 1, h)) &&
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(bVal == GRREFERENCE->getPixel(w - 1, h + 1)) &&
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(bVal == GRREFERENCE->getPixel(w, h + 1)) &&
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(bVal == GRREFERENCE->getPixel(w + 1, h + 1)))) {
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uint32_t CONTEXT = line5;
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CONTEXT |= line4 << 3;
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CONTEXT |= line3 << 6;
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CONTEXT |= GRREFERENCE->getPixel(w - GRREFERENCEDX + GRAT[2],
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h - GRREFERENCEDY + GRAT[3])
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<< 8;
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CONTEXT |= line2 << 9;
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CONTEXT |= line1 << 10;
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CONTEXT |= GRREG->getPixel(w + GRAT[0], h + GRAT[1]) << 12;
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bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
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}
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GRREG->setPixel(w, h, bVal);
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line1 = ((line1 << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x03;
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line2 = ((line2 << 1) | bVal) & 0x01;
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line3 = ((line3 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
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h - GRREFERENCEDY - 1)) &
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0x03;
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line4 =
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((line4 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
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0x07;
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line5 = ((line5 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
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h - GRREFERENCEDY + 1)) &
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0x07;
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}
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}
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}
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return GRREG.release();
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}
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CJBig2_Image* CJBig2_GRRDProc::decode_Template0_opt(
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CJBig2_ArithDecoder* pArithDecoder,
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JBig2ArithCtx* grContext) {
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if (!GRREFERENCE->m_pData)
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return nullptr;
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int32_t iGRW = static_cast<int32_t>(GRW);
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int32_t iGRH = static_cast<int32_t>(GRH);
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std::unique_ptr<CJBig2_Image> GRREG(new CJBig2_Image(iGRW, iGRH));
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if (!GRREG->m_pData)
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return nullptr;
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FX_BOOL LTP = FALSE;
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uint8_t* pLine = GRREG->m_pData;
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uint8_t* pLineR = GRREFERENCE->m_pData;
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intptr_t nStride = GRREG->m_nStride;
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intptr_t nStrideR = GRREFERENCE->m_nStride;
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int32_t GRWR = GRREFERENCE->m_nWidth;
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int32_t GRHR = GRREFERENCE->m_nHeight;
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if (GRREFERENCEDY < -GRHR + 1 || GRREFERENCEDY > GRHR - 1)
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GRREFERENCEDY = 0;
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intptr_t nOffset = -GRREFERENCEDY * nStrideR;
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for (int32_t h = 0; h < iGRH; h++) {
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if (TPGRON)
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LTP = LTP ^ pArithDecoder->DECODE(&grContext[0x0010]);
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uint32_t line1 = (h > 0) ? pLine[-nStride] << 4 : 0;
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int32_t reference_h = h - GRREFERENCEDY;
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FX_BOOL line1_r_ok = (reference_h > 0 && reference_h < GRHR + 1);
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FX_BOOL line2_r_ok = (reference_h > -1 && reference_h < GRHR);
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FX_BOOL line3_r_ok = (reference_h > -2 && reference_h < GRHR - 1);
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uint32_t line1_r = line1_r_ok ? pLineR[nOffset - nStrideR] : 0;
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uint32_t line2_r = line2_r_ok ? pLineR[nOffset] : 0;
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uint32_t line3_r = line3_r_ok ? pLineR[nOffset + nStrideR] : 0;
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if (!LTP) {
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uint32_t CONTEXT = (line1 & 0x1c00) | (line1_r & 0x01c0) |
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((line2_r >> 3) & 0x0038) | ((line3_r >> 6) & 0x0007);
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for (int32_t w = 0; w < iGRW; w += 8) {
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int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
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if (h > 0) {
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line1 = (line1 << 8) |
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(w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 4 : 0);
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}
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if (h > GRHR + GRREFERENCEDY + 1) {
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line1_r = 0;
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line2_r = 0;
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line3_r = 0;
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} else {
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if (line1_r_ok) {
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line1_r =
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(line1_r << 8) |
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(w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
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}
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if (line2_r_ok) {
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line2_r = (line2_r << 8) |
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(w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
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}
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if (line3_r_ok) {
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line3_r =
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(line3_r << 8) |
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(w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
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} else {
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line3_r = 0;
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}
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}
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uint8_t cVal = 0;
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for (int32_t k = 0; k < nBits; k++) {
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FX_BOOL bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
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cVal |= bVal << (7 - k);
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CONTEXT = ((CONTEXT & 0x0cdb) << 1) | (bVal << 9) |
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((line1 >> (7 - k)) & 0x0400) |
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((line1_r >> (7 - k)) & 0x0040) |
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((line2_r >> (10 - k)) & 0x0008) |
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((line3_r >> (13 - k)) & 0x0001);
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}
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pLine[w >> 3] = cVal;
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}
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} else {
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uint32_t CONTEXT = (line1 & 0x1c00) | (line1_r & 0x01c0) |
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((line2_r >> 3) & 0x0038) | ((line3_r >> 6) & 0x0007);
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for (int32_t w = 0; w < iGRW; w += 8) {
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int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
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if (h > 0) {
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line1 = (line1 << 8) |
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(w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 4 : 0);
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}
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if (line1_r_ok) {
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line1_r =
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(line1_r << 8) |
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(w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
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}
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if (line2_r_ok) {
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line2_r = (line2_r << 8) |
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(w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
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}
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if (line3_r_ok) {
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line3_r =
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(line3_r << 8) |
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(w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
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} else {
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line3_r = 0;
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}
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uint8_t cVal = 0;
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for (int32_t k = 0; k < nBits; k++) {
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FX_BOOL bVal = GRREFERENCE->getPixel(w + k, h);
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if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w + k - 1, h - 1)) &&
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(bVal == GRREFERENCE->getPixel(w + k, h - 1)) &&
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(bVal == GRREFERENCE->getPixel(w + k + 1, h - 1)) &&
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(bVal == GRREFERENCE->getPixel(w + k - 1, h)) &&
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(bVal == GRREFERENCE->getPixel(w + k + 1, h)) &&
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(bVal == GRREFERENCE->getPixel(w + k - 1, h + 1)) &&
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(bVal == GRREFERENCE->getPixel(w + k, h + 1)) &&
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(bVal == GRREFERENCE->getPixel(w + k + 1, h + 1)))) {
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bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
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}
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cVal |= bVal << (7 - k);
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CONTEXT = ((CONTEXT & 0x0cdb) << 1) | (bVal << 9) |
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((line1 >> (7 - k)) & 0x0400) |
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((line1_r >> (7 - k)) & 0x0040) |
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((line2_r >> (10 - k)) & 0x0008) |
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((line3_r >> (13 - k)) & 0x0001);
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}
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pLine[w >> 3] = cVal;
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}
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}
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pLine += nStride;
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if (h < GRHR + GRREFERENCEDY) {
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pLineR += nStrideR;
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}
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}
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return GRREG.release();
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}
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CJBig2_Image* CJBig2_GRRDProc::decode_Template1_unopt(
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CJBig2_ArithDecoder* pArithDecoder,
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JBig2ArithCtx* grContext) {
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FX_BOOL LTP = FALSE;
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std::unique_ptr<CJBig2_Image> GRREG(new CJBig2_Image(GRW, GRH));
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GRREG->fill(0);
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for (uint32_t h = 0; h < GRH; h++) {
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if (TPGRON)
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LTP = LTP ^ pArithDecoder->DECODE(&grContext[0x0008]);
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if (!LTP) {
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uint32_t line1 = GRREG->getPixel(1, h - 1);
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line1 |= GRREG->getPixel(0, h - 1) << 1;
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line1 |= GRREG->getPixel(-1, h - 1) << 2;
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uint32_t line2 = 0;
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uint32_t line3 =
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GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1);
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uint32_t line4 =
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GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
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line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
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line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
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<< 2;
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uint32_t line5 =
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GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
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line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
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<< 1;
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for (uint32_t w = 0; w < GRW; w++) {
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uint32_t CONTEXT = line5;
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CONTEXT |= line4 << 2;
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CONTEXT |= line3 << 5;
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CONTEXT |= line2 << 6;
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CONTEXT |= line1 << 7;
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FX_BOOL bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
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GRREG->setPixel(w, h, bVal);
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line1 = ((line1 << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x07;
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line2 = ((line2 << 1) | bVal) & 0x01;
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line3 = ((line3 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 1,
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h - GRREFERENCEDY - 1)) &
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0x01;
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line4 =
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((line4 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
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0x07;
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line5 = ((line5 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
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h - GRREFERENCEDY + 1)) &
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0x03;
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}
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} else {
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uint32_t line1 = GRREG->getPixel(1, h - 1);
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line1 |= GRREG->getPixel(0, h - 1) << 1;
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line1 |= GRREG->getPixel(-1, h - 1) << 2;
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uint32_t line2 = 0;
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uint32_t line3 =
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GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1);
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uint32_t line4 =
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GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
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line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
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line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
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<< 2;
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uint32_t line5 =
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GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
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line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
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<< 1;
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for (uint32_t w = 0; w < GRW; w++) {
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FX_BOOL bVal = GRREFERENCE->getPixel(w, h);
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if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w - 1, h - 1)) &&
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(bVal == GRREFERENCE->getPixel(w, h - 1)) &&
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(bVal == GRREFERENCE->getPixel(w + 1, h - 1)) &&
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(bVal == GRREFERENCE->getPixel(w - 1, h)) &&
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(bVal == GRREFERENCE->getPixel(w + 1, h)) &&
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(bVal == GRREFERENCE->getPixel(w - 1, h + 1)) &&
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(bVal == GRREFERENCE->getPixel(w, h + 1)) &&
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(bVal == GRREFERENCE->getPixel(w + 1, h + 1)))) {
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uint32_t CONTEXT = line5;
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CONTEXT |= line4 << 2;
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CONTEXT |= line3 << 5;
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CONTEXT |= line2 << 6;
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CONTEXT |= line1 << 7;
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bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
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}
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GRREG->setPixel(w, h, bVal);
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line1 = ((line1 << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x07;
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line2 = ((line2 << 1) | bVal) & 0x01;
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line3 = ((line3 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 1,
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h - GRREFERENCEDY - 1)) &
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0x01;
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line4 =
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((line4 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
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0x07;
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line5 = ((line5 << 1) |
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GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
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h - GRREFERENCEDY + 1)) &
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0x03;
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}
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}
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}
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return GRREG.release();
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}
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CJBig2_Image* CJBig2_GRRDProc::decode_Template1_opt(
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CJBig2_ArithDecoder* pArithDecoder,
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JBig2ArithCtx* grContext) {
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if (!GRREFERENCE->m_pData)
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return nullptr;
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int32_t iGRW = static_cast<int32_t>(GRW);
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int32_t iGRH = static_cast<int32_t>(GRH);
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std::unique_ptr<CJBig2_Image> GRREG(new CJBig2_Image(iGRW, iGRH));
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if (!GRREG->m_pData)
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return nullptr;
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FX_BOOL LTP = FALSE;
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uint8_t* pLine = GRREG->m_pData;
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uint8_t* pLineR = GRREFERENCE->m_pData;
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intptr_t nStride = GRREG->m_nStride;
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intptr_t nStrideR = GRREFERENCE->m_nStride;
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int32_t GRWR = GRREFERENCE->m_nWidth;
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int32_t GRHR = GRREFERENCE->m_nHeight;
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if (GRREFERENCEDY < -GRHR + 1 || GRREFERENCEDY > GRHR - 1) {
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GRREFERENCEDY = 0;
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}
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intptr_t nOffset = -GRREFERENCEDY * nStrideR;
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for (int32_t h = 0; h < iGRH; h++) {
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if (TPGRON)
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LTP = LTP ^ pArithDecoder->DECODE(&grContext[0x0008]);
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uint32_t line1 = (h > 0) ? pLine[-nStride] << 1 : 0;
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int32_t reference_h = h - GRREFERENCEDY;
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FX_BOOL line1_r_ok = (reference_h > 0 && reference_h < GRHR + 1);
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FX_BOOL line2_r_ok = (reference_h > -1 && reference_h < GRHR);
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FX_BOOL line3_r_ok = (reference_h > -2 && reference_h < GRHR - 1);
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uint32_t line1_r = line1_r_ok ? pLineR[nOffset - nStrideR] : 0;
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uint32_t line2_r = line2_r_ok ? pLineR[nOffset] : 0;
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uint32_t line3_r = line3_r_ok ? pLineR[nOffset + nStrideR] : 0;
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if (!LTP) {
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uint32_t CONTEXT = (line1 & 0x0380) | ((line1_r >> 2) & 0x0020) |
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((line2_r >> 4) & 0x001c) | ((line3_r >> 6) & 0x0003);
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for (int32_t w = 0; w < iGRW; w += 8) {
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int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
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if (h > 0)
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line1 = (line1 << 8) |
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(w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 1 : 0);
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if (line1_r_ok)
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line1_r =
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(line1_r << 8) |
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(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;
|
}
|
uint8_t cVal = 0;
|
for (int32_t k = 0; k < nBits; k++) {
|
FX_BOOL 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 {
|
uint32_t CONTEXT = (line1 & 0x0380) | ((line1_r >> 2) & 0x0020) |
|
((line2_r >> 4) & 0x001c) | ((line3_r >> 6) & 0x0003);
|
for (int32_t w = 0; w < iGRW; w += 8) {
|
int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
|
if (h > 0)
|
line1 = (line1 << 8) |
|
(w + 8 < iGRW ? 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;
|
}
|
uint8_t cVal = 0;
|
for (int32_t k = 0; k < nBits; k++) {
|
FX_BOOL 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();
|
}
|
