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// Copyright 2014 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_Image.h"
#include <limits.h>
#include <string.h>
#include <algorithm>
#include <memory>
#include "core/fxcrt/fx_coordinates.h"
#include "core/fxcrt/fx_memory.h"
#include "core/fxcrt/fx_safe_types.h"
#include "third_party/base/check.h"
#define JBIG2_GETDWORD(buf) \
((static_cast<uint32_t>((buf)[0]) << 24) | \
(static_cast<uint32_t>((buf)[1]) << 16) | \
(static_cast<uint32_t>((buf)[2]) << 8) | \
(static_cast<uint32_t>((buf)[3]) << 0))
#define JBIG2_PUTDWORD(buf, val) \
((buf)[0] = static_cast<uint8_t>((val) >> 24), \
(buf)[1] = static_cast<uint8_t>((val) >> 16), \
(buf)[2] = static_cast<uint8_t>((val) >> 8), \
(buf)[3] = static_cast<uint8_t>((val) >> 0))
namespace {
const int kMaxImagePixels = INT_MAX - 31;
const int kMaxImageBytes = kMaxImagePixels / 8;
int BitIndexToByte(int index) {
return index / 8;
}
int BitIndexToAlignedByte(int index) {
return index / 32 * 4;
}
} // namespace
CJBig2_Image::CJBig2_Image(int32_t w, int32_t h) {
if (w <= 0 || h <= 0 || w > kMaxImagePixels)
return;
int32_t stride_pixels = FxAlignToBoundary<32>(w);
if (h > kMaxImagePixels / stride_pixels)
return;
m_nWidth = w;
m_nHeight = h;
m_nStride = stride_pixels / 8;
m_pData.Reset(std::unique_ptr<uint8_t, FxFreeDeleter>(
FX_Alloc2D(uint8_t, m_nStride, m_nHeight)));
}
CJBig2_Image::CJBig2_Image(int32_t w,
int32_t h,
int32_t stride,
uint8_t* pBuf) {
if (w < 0 || h < 0)
return;
// Stride must be word-aligned.
if (stride < 0 || stride > kMaxImageBytes || stride % 4 != 0)
return;
int32_t stride_pixels = 8 * stride;
if (stride_pixels < w || h > kMaxImagePixels / stride_pixels)
return;
m_nWidth = w;
m_nHeight = h;
m_nStride = stride;
m_pData.Reset(pBuf);
}
CJBig2_Image::CJBig2_Image(const CJBig2_Image& other)
: m_nWidth(other.m_nWidth),
m_nHeight(other.m_nHeight),
m_nStride(other.m_nStride) {
if (other.m_pData) {
m_pData.Reset(std::unique_ptr<uint8_t, FxFreeDeleter>(
FX_Alloc2D(uint8_t, m_nStride, m_nHeight)));
memcpy(data(), other.data(), m_nStride * m_nHeight);
}
}
CJBig2_Image::~CJBig2_Image() = default;
// static
bool CJBig2_Image::IsValidImageSize(int32_t w, int32_t h) {
return w > 0 && w <= kJBig2MaxImageSize && h > 0 && h <= kJBig2MaxImageSize;
}
int CJBig2_Image::GetPixel(int32_t x, int32_t y) const {
if (!m_pData)
return 0;
if (x < 0 || x >= m_nWidth)
return 0;
const uint8_t* pLine = GetLine(y);
if (!pLine)
return 0;
int32_t m = BitIndexToByte(x);
int32_t n = x & 7;
return ((pLine[m] >> (7 - n)) & 1);
}
void CJBig2_Image::SetPixel(int32_t x, int32_t y, int v) {
if (!m_pData)
return;
if (x < 0 || x >= m_nWidth)
return;
uint8_t* pLine = GetLine(y);
if (!pLine)
return;
int32_t m = BitIndexToByte(x);
int32_t n = 1 << (7 - (x & 7));
if (v)
pLine[m] |= n;
else
pLine[m] &= ~n;
}
void CJBig2_Image::CopyLine(int32_t hTo, int32_t hFrom) {
if (!m_pData)
return;
uint8_t* pDst = GetLine(hTo);
if (!pDst)
return;
const uint8_t* pSrc = GetLine(hFrom);
if (!pSrc) {
memset(pDst, 0, m_nStride);
return;
}
memcpy(pDst, pSrc, m_nStride);
}
void CJBig2_Image::Fill(bool v) {
if (!m_pData)
return;
memset(data(), v ? 0xff : 0, m_nStride * m_nHeight);
}
bool CJBig2_Image::ComposeTo(CJBig2_Image* pDst,
int32_t x,
int32_t y,
JBig2ComposeOp op) {
return m_pData &&
ComposeToInternal(pDst, x, y, op, FX_RECT(0, 0, m_nWidth, m_nHeight));
}
bool CJBig2_Image::ComposeToWithRect(CJBig2_Image* pDst,
int32_t x,
int32_t y,
const FX_RECT& rtSrc,
JBig2ComposeOp op) {
return m_pData && ComposeToInternal(pDst, x, y, op, rtSrc);
}
bool CJBig2_Image::ComposeFrom(int32_t x,
int32_t y,
CJBig2_Image* pSrc,
JBig2ComposeOp op) {
return m_pData && pSrc->ComposeTo(this, x, y, op);
}
bool CJBig2_Image::ComposeFromWithRect(int32_t x,
int32_t y,
CJBig2_Image* pSrc,
const FX_RECT& rtSrc,
JBig2ComposeOp op) {
return m_pData && pSrc->ComposeToWithRect(this, x, y, rtSrc, op);
}
std::unique_ptr<CJBig2_Image> CJBig2_Image::SubImage(int32_t x,
int32_t y,
int32_t w,
int32_t h) {
auto pImage = std::make_unique<CJBig2_Image>(w, h);
if (!pImage->data() || !m_pData)
return pImage;
if (x < 0 || x >= m_nWidth || y < 0 || y >= m_nHeight)
return pImage;
// Fast case when byte-aligned, normal slow case otherwise.
if ((x & 7) == 0)
SubImageFast(x, y, w, h, pImage.get());
else
SubImageSlow(x, y, w, h, pImage.get());
return pImage;
}
void CJBig2_Image::SubImageFast(int32_t x,
int32_t y,
int32_t w,
int32_t h,
CJBig2_Image* pImage) {
int32_t m = BitIndexToByte(x);
int32_t bytes_to_copy = std::min(pImage->m_nStride, m_nStride - m);
int32_t lines_to_copy = std::min(pImage->m_nHeight, m_nHeight - y);
for (int32_t j = 0; j < lines_to_copy; j++)
memcpy(pImage->GetLineUnsafe(j), GetLineUnsafe(y + j) + m, bytes_to_copy);
}
void CJBig2_Image::SubImageSlow(int32_t x,
int32_t y,
int32_t w,
int32_t h,
CJBig2_Image* pImage) {
int32_t m = BitIndexToAlignedByte(x);
int32_t n = x & 31;
int32_t bytes_to_copy = std::min(pImage->m_nStride, m_nStride - m);
int32_t lines_to_copy = std::min(pImage->m_nHeight, m_nHeight - y);
for (int32_t j = 0; j < lines_to_copy; j++) {
const uint8_t* pLineSrc = GetLineUnsafe(y + j);
uint8_t* pLineDst = pImage->GetLineUnsafe(j);
const uint8_t* pSrc = pLineSrc + m;
const uint8_t* pSrcEnd = pLineSrc + m_nStride;
uint8_t* pDstEnd = pLineDst + bytes_to_copy;
for (uint8_t* pDst = pLineDst; pDst < pDstEnd; pSrc += 4, pDst += 4) {
uint32_t wTmp = JBIG2_GETDWORD(pSrc) << n;
if (pSrc + 4 < pSrcEnd)
wTmp |= (JBIG2_GETDWORD(pSrc + 4) >> (32 - n));
JBIG2_PUTDWORD(pDst, wTmp);
}
}
}
void CJBig2_Image::Expand(int32_t h, bool v) {
if (!m_pData || h <= m_nHeight || h > kMaxImageBytes / m_nStride)
return;
if (m_pData.IsOwned()) {
m_pData.Reset(std::unique_ptr<uint8_t, FxFreeDeleter>(FX_Realloc(
uint8_t, m_pData.ReleaseAndClear().release(), h * m_nStride)));
} else {
uint8_t* pExternalBuffer = data();
m_pData.Reset(std::unique_ptr<uint8_t, FxFreeDeleter>(
FX_Alloc(uint8_t, h * m_nStride)));
memcpy(data(), pExternalBuffer, m_nHeight * m_nStride);
}
memset(data() + m_nHeight * m_nStride, v ? 0xff : 0,
(h - m_nHeight) * m_nStride);
m_nHeight = h;
}
bool CJBig2_Image::ComposeToInternal(CJBig2_Image* pDst,
int32_t x,
int32_t y,
JBig2ComposeOp op,
const FX_RECT& rtSrc) {
DCHECK(m_pData);
// TODO(weili): Check whether the range check is correct. Should x>=1048576?
if (x < -1048576 || x > 1048576 || y < -1048576 || y > 1048576)
return false;
int32_t sw = rtSrc.Width();
int32_t sh = rtSrc.Height();
int32_t xs0 = x < 0 ? -x : 0;
int32_t xs1;
FX_SAFE_INT32 iChecked = pDst->m_nWidth;
iChecked -= x;
if (iChecked.IsValid() && sw > iChecked.ValueOrDie())
xs1 = iChecked.ValueOrDie();
else
xs1 = sw;
int32_t ys0 = y < 0 ? -y : 0;
int32_t ys1;
iChecked = pDst->m_nHeight;
iChecked -= y;
if (iChecked.IsValid() && sh > iChecked.ValueOrDie())
ys1 = iChecked.ValueOrDie();
else
ys1 = sh;
if (ys0 >= ys1 || xs0 >= xs1)
return false;
int32_t xd0 = std::max(x, 0);
int32_t yd0 = std::max(y, 0);
int32_t w = xs1 - xs0;
int32_t h = ys1 - ys0;
int32_t xd1 = xd0 + w;
int32_t yd1 = yd0 + h;
uint32_t d1 = xd0 & 31;
uint32_t d2 = xd1 & 31;
uint32_t s1 = xs0 & 31;
uint32_t maskL = 0xffffffff >> d1;
uint32_t maskR = 0xffffffff << ((32 - (xd1 & 31)) % 32);
uint32_t maskM = maskL & maskR;
const uint8_t* lineSrc =
GetLineUnsafe(rtSrc.top + ys0) + BitIndexToAlignedByte(xs0 + rtSrc.left);
const uint8_t* lineSrcEnd = data() + m_nHeight * m_nStride;
int32_t lineLeft = m_nStride - BitIndexToAlignedByte(xs0);
uint8_t* lineDst = pDst->GetLineUnsafe(yd0) + BitIndexToAlignedByte(xd0);
if ((xd0 & ~31) == ((xd1 - 1) & ~31)) {
if ((xs0 & ~31) == ((xs1 - 1) & ~31)) {
if (s1 > d1) {
uint32_t shift = s1 - d1;
for (int32_t yy = yd0; yy < yd1; yy++) {
if (lineSrc >= lineSrcEnd)
return false;
uint32_t tmp1 = JBIG2_GETDWORD(lineSrc) << shift;
uint32_t tmp2 = JBIG2_GETDWORD(lineDst);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = (tmp2 & ~maskM) | ((tmp1 | tmp2) & maskM);
break;
case JBIG2_COMPOSE_AND:
tmp = (tmp2 & ~maskM) | ((tmp1 & tmp2) & maskM);
break;
case JBIG2_COMPOSE_XOR:
tmp = (tmp2 & ~maskM) | ((tmp1 ^ tmp2) & maskM);
break;
case JBIG2_COMPOSE_XNOR:
tmp = (tmp2 & ~maskM) | ((~(tmp1 ^ tmp2)) & maskM);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = (tmp2 & ~maskM) | (tmp1 & maskM);
break;
}
JBIG2_PUTDWORD(lineDst, tmp);
lineSrc += m_nStride;
lineDst += pDst->m_nStride;
}
} else {
uint32_t shift = d1 - s1;
for (int32_t yy = yd0; yy < yd1; yy++) {
if (lineSrc >= lineSrcEnd)
return false;
uint32_t tmp1 = JBIG2_GETDWORD(lineSrc) >> shift;
uint32_t tmp2 = JBIG2_GETDWORD(lineDst);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = (tmp2 & ~maskM) | ((tmp1 | tmp2) & maskM);
break;
case JBIG2_COMPOSE_AND:
tmp = (tmp2 & ~maskM) | ((tmp1 & tmp2) & maskM);
break;
case JBIG2_COMPOSE_XOR:
tmp = (tmp2 & ~maskM) | ((tmp1 ^ tmp2) & maskM);
break;
case JBIG2_COMPOSE_XNOR:
tmp = (tmp2 & ~maskM) | ((~(tmp1 ^ tmp2)) & maskM);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = (tmp2 & ~maskM) | (tmp1 & maskM);
break;
}
JBIG2_PUTDWORD(lineDst, tmp);
lineSrc += m_nStride;
lineDst += pDst->m_nStride;
}
}
} else {
uint32_t shift1 = s1 - d1;
uint32_t shift2 = 32 - shift1;
for (int32_t yy = yd0; yy < yd1; yy++) {
if (lineSrc >= lineSrcEnd)
return false;
uint32_t tmp1 = (JBIG2_GETDWORD(lineSrc) << shift1) |
(JBIG2_GETDWORD(lineSrc + 4) >> shift2);
uint32_t tmp2 = JBIG2_GETDWORD(lineDst);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = (tmp2 & ~maskM) | ((tmp1 | tmp2) & maskM);
break;
case JBIG2_COMPOSE_AND:
tmp = (tmp2 & ~maskM) | ((tmp1 & tmp2) & maskM);
break;
case JBIG2_COMPOSE_XOR:
tmp = (tmp2 & ~maskM) | ((tmp1 ^ tmp2) & maskM);
break;
case JBIG2_COMPOSE_XNOR:
tmp = (tmp2 & ~maskM) | ((~(tmp1 ^ tmp2)) & maskM);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = (tmp2 & ~maskM) | (tmp1 & maskM);
break;
}
JBIG2_PUTDWORD(lineDst, tmp);
lineSrc += m_nStride;
lineDst += pDst->m_nStride;
}
}
} else {
if (s1 > d1) {
uint32_t shift1 = s1 - d1;
uint32_t shift2 = 32 - shift1;
int32_t middleDwords = (xd1 >> 5) - ((xd0 + 31) >> 5);
for (int32_t yy = yd0; yy < yd1; yy++) {
if (lineSrc >= lineSrcEnd)
return false;
const uint8_t* sp = lineSrc;
uint8_t* dp = lineDst;
if (d1 != 0) {
uint32_t tmp1 = (JBIG2_GETDWORD(sp) << shift1) |
(JBIG2_GETDWORD(sp + 4) >> shift2);
uint32_t tmp2 = JBIG2_GETDWORD(dp);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = (tmp2 & ~maskL) | ((tmp1 | tmp2) & maskL);
break;
case JBIG2_COMPOSE_AND:
tmp = (tmp2 & ~maskL) | ((tmp1 & tmp2) & maskL);
break;
case JBIG2_COMPOSE_XOR:
tmp = (tmp2 & ~maskL) | ((tmp1 ^ tmp2) & maskL);
break;
case JBIG2_COMPOSE_XNOR:
tmp = (tmp2 & ~maskL) | ((~(tmp1 ^ tmp2)) & maskL);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = (tmp2 & ~maskL) | (tmp1 & maskL);
break;
}
JBIG2_PUTDWORD(dp, tmp);
sp += 4;
dp += 4;
}
for (int32_t xx = 0; xx < middleDwords; xx++) {
uint32_t tmp1 = (JBIG2_GETDWORD(sp) << shift1) |
(JBIG2_GETDWORD(sp + 4) >> shift2);
uint32_t tmp2 = JBIG2_GETDWORD(dp);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = tmp1 | tmp2;
break;
case JBIG2_COMPOSE_AND:
tmp = tmp1 & tmp2;
break;
case JBIG2_COMPOSE_XOR:
tmp = tmp1 ^ tmp2;
break;
case JBIG2_COMPOSE_XNOR:
tmp = ~(tmp1 ^ tmp2);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = tmp1;
break;
}
JBIG2_PUTDWORD(dp, tmp);
sp += 4;
dp += 4;
}
if (d2 != 0) {
uint32_t tmp1 =
(JBIG2_GETDWORD(sp) << shift1) |
(((sp + 4) < lineSrc + lineLeft ? JBIG2_GETDWORD(sp + 4) : 0) >>
shift2);
uint32_t tmp2 = JBIG2_GETDWORD(dp);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = (tmp2 & ~maskR) | ((tmp1 | tmp2) & maskR);
break;
case JBIG2_COMPOSE_AND:
tmp = (tmp2 & ~maskR) | ((tmp1 & tmp2) & maskR);
break;
case JBIG2_COMPOSE_XOR:
tmp = (tmp2 & ~maskR) | ((tmp1 ^ tmp2) & maskR);
break;
case JBIG2_COMPOSE_XNOR:
tmp = (tmp2 & ~maskR) | ((~(tmp1 ^ tmp2)) & maskR);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = (tmp2 & ~maskR) | (tmp1 & maskR);
break;
}
JBIG2_PUTDWORD(dp, tmp);
}
lineSrc += m_nStride;
lineDst += pDst->m_nStride;
}
} else if (s1 == d1) {
int32_t middleDwords = (xd1 >> 5) - ((xd0 + 31) >> 5);
for (int32_t yy = yd0; yy < yd1; yy++) {
if (lineSrc >= lineSrcEnd)
return false;
const uint8_t* sp = lineSrc;
uint8_t* dp = lineDst;
if (d1 != 0) {
uint32_t tmp1 = JBIG2_GETDWORD(sp);
uint32_t tmp2 = JBIG2_GETDWORD(dp);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = (tmp2 & ~maskL) | ((tmp1 | tmp2) & maskL);
break;
case JBIG2_COMPOSE_AND:
tmp = (tmp2 & ~maskL) | ((tmp1 & tmp2) & maskL);
break;
case JBIG2_COMPOSE_XOR:
tmp = (tmp2 & ~maskL) | ((tmp1 ^ tmp2) & maskL);
break;
case JBIG2_COMPOSE_XNOR:
tmp = (tmp2 & ~maskL) | ((~(tmp1 ^ tmp2)) & maskL);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = (tmp2 & ~maskL) | (tmp1 & maskL);
break;
}
JBIG2_PUTDWORD(dp, tmp);
sp += 4;
dp += 4;
}
for (int32_t xx = 0; xx < middleDwords; xx++) {
uint32_t tmp1 = JBIG2_GETDWORD(sp);
uint32_t tmp2 = JBIG2_GETDWORD(dp);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = tmp1 | tmp2;
break;
case JBIG2_COMPOSE_AND:
tmp = tmp1 & tmp2;
break;
case JBIG2_COMPOSE_XOR:
tmp = tmp1 ^ tmp2;
break;
case JBIG2_COMPOSE_XNOR:
tmp = ~(tmp1 ^ tmp2);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = tmp1;
break;
}
JBIG2_PUTDWORD(dp, tmp);
sp += 4;
dp += 4;
}
if (d2 != 0) {
uint32_t tmp1 = JBIG2_GETDWORD(sp);
uint32_t tmp2 = JBIG2_GETDWORD(dp);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = (tmp2 & ~maskR) | ((tmp1 | tmp2) & maskR);
break;
case JBIG2_COMPOSE_AND:
tmp = (tmp2 & ~maskR) | ((tmp1 & tmp2) & maskR);
break;
case JBIG2_COMPOSE_XOR:
tmp = (tmp2 & ~maskR) | ((tmp1 ^ tmp2) & maskR);
break;
case JBIG2_COMPOSE_XNOR:
tmp = (tmp2 & ~maskR) | ((~(tmp1 ^ tmp2)) & maskR);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = (tmp2 & ~maskR) | (tmp1 & maskR);
break;
}
JBIG2_PUTDWORD(dp, tmp);
}
lineSrc += m_nStride;
lineDst += pDst->m_nStride;
}
} else {
uint32_t shift1 = d1 - s1;
uint32_t shift2 = 32 - shift1;
int32_t middleDwords = (xd1 >> 5) - ((xd0 + 31) >> 5);
for (int32_t yy = yd0; yy < yd1; yy++) {
if (lineSrc >= lineSrcEnd)
return false;
const uint8_t* sp = lineSrc;
uint8_t* dp = lineDst;
if (d1 != 0) {
uint32_t tmp1 = JBIG2_GETDWORD(sp) >> shift1;
uint32_t tmp2 = JBIG2_GETDWORD(dp);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = (tmp2 & ~maskL) | ((tmp1 | tmp2) & maskL);
break;
case JBIG2_COMPOSE_AND:
tmp = (tmp2 & ~maskL) | ((tmp1 & tmp2) & maskL);
break;
case JBIG2_COMPOSE_XOR:
tmp = (tmp2 & ~maskL) | ((tmp1 ^ tmp2) & maskL);
break;
case JBIG2_COMPOSE_XNOR:
tmp = (tmp2 & ~maskL) | ((~(tmp1 ^ tmp2)) & maskL);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = (tmp2 & ~maskL) | (tmp1 & maskL);
break;
}
JBIG2_PUTDWORD(dp, tmp);
dp += 4;
}
for (int32_t xx = 0; xx < middleDwords; xx++) {
uint32_t tmp1 = (JBIG2_GETDWORD(sp) << shift2) |
((JBIG2_GETDWORD(sp + 4)) >> shift1);
uint32_t tmp2 = JBIG2_GETDWORD(dp);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = tmp1 | tmp2;
break;
case JBIG2_COMPOSE_AND:
tmp = tmp1 & tmp2;
break;
case JBIG2_COMPOSE_XOR:
tmp = tmp1 ^ tmp2;
break;
case JBIG2_COMPOSE_XNOR:
tmp = ~(tmp1 ^ tmp2);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = tmp1;
break;
}
JBIG2_PUTDWORD(dp, tmp);
sp += 4;
dp += 4;
}
if (d2 != 0) {
uint32_t tmp1 =
(JBIG2_GETDWORD(sp) << shift2) |
(((sp + 4) < lineSrc + lineLeft ? JBIG2_GETDWORD(sp + 4) : 0) >>
shift1);
uint32_t tmp2 = JBIG2_GETDWORD(dp);
uint32_t tmp = 0;
switch (op) {
case JBIG2_COMPOSE_OR:
tmp = (tmp2 & ~maskR) | ((tmp1 | tmp2) & maskR);
break;
case JBIG2_COMPOSE_AND:
tmp = (tmp2 & ~maskR) | ((tmp1 & tmp2) & maskR);
break;
case JBIG2_COMPOSE_XOR:
tmp = (tmp2 & ~maskR) | ((tmp1 ^ tmp2) & maskR);
break;
case JBIG2_COMPOSE_XNOR:
tmp = (tmp2 & ~maskR) | ((~(tmp1 ^ tmp2)) & maskR);
break;
case JBIG2_COMPOSE_REPLACE:
tmp = (tmp2 & ~maskR) | (tmp1 & maskR);
break;
}
JBIG2_PUTDWORD(dp, tmp);
}
lineSrc += m_nStride;
lineDst += pDst->m_nStride;
}
}
}
return true;
}