diff options
Diffstat (limited to 'core/src/fxcodec/codec/fx_codec.cpp')
| -rw-r--r-- | core/src/fxcodec/codec/fx_codec.cpp | 894 |
1 files changed, 447 insertions, 447 deletions
diff --git a/core/src/fxcodec/codec/fx_codec.cpp b/core/src/fxcodec/codec/fx_codec.cpp index 2f586ca94b..c6b3ccee43 100644 --- a/core/src/fxcodec/codec/fx_codec.cpp +++ b/core/src/fxcodec/codec/fx_codec.cpp @@ -1,447 +1,447 @@ -// 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 "../../../include/fxcodec/fx_codec.h"
-#include "codec_int.h"
-CCodec_ModuleMgr::CCodec_ModuleMgr()
-{
- m_pBasicModule = FX_NEW CCodec_BasicModule;
- m_pFaxModule = FX_NEW CCodec_FaxModule;
- m_pJpegModule = FX_NEW CCodec_JpegModule;
- m_pJpxModule = FX_NEW CCodec_JpxModule;
- m_pJbig2Module = FX_NEW CCodec_Jbig2Module;
- m_pIccModule = FX_NEW CCodec_IccModule;
- m_pFlateModule = FX_NEW CCodec_FlateModule;
-}
-CCodec_ModuleMgr::~CCodec_ModuleMgr()
-{
- delete m_pBasicModule;
- delete m_pFaxModule;
- delete m_pJpegModule;
- delete m_pFlateModule;
- delete m_pJpxModule;
- delete m_pJbig2Module;
- delete m_pIccModule;
-}
-void CCodec_ModuleMgr::InitJbig2Decoder()
-{
-}
-void CCodec_ModuleMgr::InitJpxDecoder()
-{
-}
-void CCodec_ModuleMgr::InitIccDecoder()
-{
-}
-CCodec_ScanlineDecoder::CCodec_ScanlineDecoder()
-{
- m_NextLine = -1;
- m_pDataCache = NULL;
- m_pLastScanline = NULL;
-}
-CCodec_ScanlineDecoder::~CCodec_ScanlineDecoder()
-{
- if (m_pDataCache) {
- FX_Free(m_pDataCache);
- }
-}
-FX_LPBYTE CCodec_ScanlineDecoder::GetScanline(int line)
-{
- if (m_pDataCache && line < m_pDataCache->m_nCachedLines) {
- return &m_pDataCache->m_Data + line * m_Pitch;
- }
- if (m_NextLine == line + 1) {
- return m_pLastScanline;
- }
- if (m_NextLine < 0 || m_NextLine > line) {
- if (!v_Rewind()) {
- return NULL;
- }
- m_NextLine = 0;
- }
- while (m_NextLine < line) {
- ReadNextLine();
- m_NextLine ++;
- }
- m_pLastScanline = ReadNextLine();
- m_NextLine ++;
- return m_pLastScanline;
-}
-FX_BOOL CCodec_ScanlineDecoder::SkipToScanline(int line, IFX_Pause* pPause)
-{
- if (m_pDataCache && line < m_pDataCache->m_nCachedLines) {
- return FALSE;
- }
- if (m_NextLine == line || m_NextLine == line + 1) {
- return FALSE;
- }
- if (m_NextLine < 0 || m_NextLine > line) {
- v_Rewind();
- m_NextLine = 0;
- }
- m_pLastScanline = NULL;
- while (m_NextLine < line) {
- m_pLastScanline = ReadNextLine();
- m_NextLine ++;
- if (pPause && pPause->NeedToPauseNow()) {
- return TRUE;
- }
- }
- return FALSE;
-}
-FX_LPBYTE CCodec_ScanlineDecoder::ReadNextLine()
-{
- FX_LPBYTE pLine = v_GetNextLine();
- if (pLine == NULL) {
- return NULL;
- }
- if (m_pDataCache && m_NextLine == m_pDataCache->m_nCachedLines) {
- FXSYS_memcpy32(&m_pDataCache->m_Data + m_NextLine * m_Pitch, pLine, m_Pitch);
- m_pDataCache->m_nCachedLines ++;
- }
- return pLine;
-}
-void CCodec_ScanlineDecoder::DownScale(int dest_width, int dest_height)
-{
- if (dest_width < 0) {
- dest_width = -dest_width;
- }
- if (dest_height < 0) {
- dest_height = -dest_height;
- }
- v_DownScale(dest_width, dest_height);
- if (m_pDataCache) {
- if (m_pDataCache->m_Height == m_OutputHeight && m_pDataCache->m_Width == m_OutputWidth) {
- return;
- }
- FX_Free(m_pDataCache);
- m_pDataCache = NULL;
- }
- m_pDataCache = (CCodec_ImageDataCache*)FXMEM_DefaultAlloc(
- sizeof(CCodec_ImageDataCache) + m_Pitch * m_OutputHeight, FXMEM_NONLEAVE);
- if (m_pDataCache == NULL) {
- return;
- }
- m_pDataCache->m_Height = m_OutputHeight;
- m_pDataCache->m_Width = m_OutputWidth;
- m_pDataCache->m_nCachedLines = 0;
-}
-FX_BOOL CCodec_BasicModule::RunLengthEncode(const FX_BYTE* src_buf, FX_DWORD src_size, FX_LPBYTE& dest_buf,
- FX_DWORD& dest_size)
-{
- return FALSE;
-}
-extern "C" double FXstrtod(const char* nptr, char** endptr)
-{
- double ret = 0.0;
- const char* ptr = nptr;
- const char* exp_ptr = NULL;
- int e_number = 0,
- e_signal = 0,
- e_point = 0,
- is_negative = 0;
- int exp_ret = 0, exp_sig = 1,
- fra_ret = 0, fra_count = 0, fra_base = 1;
- if(nptr == NULL) {
- return 0.0;
- }
- for (;; ptr++) {
- if(!e_number && !e_point && (*ptr == '\t' || *ptr == ' ')) {
- continue;
- }
- if(*ptr >= '0' && *ptr <= '9') {
- if(!e_number) {
- e_number = 1;
- }
- if(!e_point) {
- ret *= 10;
- ret += (*ptr - '0');
- } else {
- fra_count++;
- fra_ret *= 10;
- fra_ret += (*ptr - '0');
- }
- continue;
- }
- if(!e_point && *ptr == '.') {
- e_point = 1;
- continue;
- }
- if(!e_number && !e_point && !e_signal) {
- switch(*ptr) {
- case '-':
- is_negative = 1;
- case '+':
- e_signal = 1;
- continue;
- }
- }
- if(e_number && (*ptr == 'e' || *ptr == 'E')) {
-#define EXPONENT_DETECT(ptr) \
- for(;;ptr++){ \
- if(*ptr < '0' || *ptr > '9'){ \
- if(endptr) *endptr = (char*)ptr; \
- break; \
- }else{ \
- exp_ret *= 10; \
- exp_ret += (*ptr - '0'); \
- continue; \
- } \
- }
- exp_ptr = ptr++;
- if(*ptr == '+' || *ptr == '-') {
- exp_sig = (*ptr++ == '+') ? 1 : -1;
- if(*ptr < '0' || *ptr > '9') {
- if(endptr) {
- *endptr = (char*)exp_ptr;
- }
- break;
- }
- EXPONENT_DETECT(ptr);
- } else if(*ptr >= '0' && *ptr <= '9') {
- EXPONENT_DETECT(ptr);
- } else {
- if(endptr) {
- *endptr = (char*)exp_ptr;
- }
- break;
- }
-#undef EXPONENT_DETECT
- break;
- }
- if(ptr != nptr && !e_number) {
- if(endptr) {
- *endptr = (char*)nptr;
- }
- break;
- }
- if(endptr) {
- *endptr = (char*)ptr;
- }
- break;
- }
- while(fra_count--) {
- fra_base *= 10;
- }
- ret += (double)fra_ret / (double)fra_base;
- if(exp_sig == 1) {
- while(exp_ret--) {
- ret *= 10.0;
- }
- } else {
- while(exp_ret--) {
- ret /= 10.0;
- }
- }
- return is_negative ? -ret : ret;
-}
-FX_BOOL CCodec_BasicModule::A85Encode(const FX_BYTE* src_buf, FX_DWORD src_size, FX_LPBYTE& dest_buf,
- FX_DWORD& dest_size)
-{
- return FALSE;
-}
-CCodec_ModuleMgr* CCodec_ModuleMgr::Create()
-{
- return FX_NEW CCodec_ModuleMgr;
-}
-void CCodec_ModuleMgr::Destroy()
-{
- delete this;
-}
-class CCodec_RLScanlineDecoder : public CCodec_ScanlineDecoder
-{
-public:
- CCodec_RLScanlineDecoder();
- virtual ~CCodec_RLScanlineDecoder();
- FX_BOOL Create(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height, int nComps, int bpc);
- virtual void v_DownScale(int dest_width, int dest_height) {}
- virtual FX_BOOL v_Rewind();
- virtual FX_LPBYTE v_GetNextLine();
- virtual FX_DWORD GetSrcOffset()
- {
- return m_SrcOffset;
- }
-protected:
- FX_BOOL CheckDestSize();
- void GetNextOperator();
- void UpdateOperator(FX_BYTE used_bytes);
-
- FX_LPBYTE m_pScanline;
- FX_LPCBYTE m_pSrcBuf;
- FX_DWORD m_SrcSize;
- FX_DWORD m_dwLineBytes;
- FX_DWORD m_SrcOffset;
- FX_BOOL m_bEOD;
- FX_BYTE m_Operator;
-};
-CCodec_RLScanlineDecoder::CCodec_RLScanlineDecoder()
- : m_pScanline(NULL)
- , m_pSrcBuf(NULL)
- , m_SrcSize(0)
- , m_dwLineBytes(0)
- , m_SrcOffset(0)
- , m_bEOD(FALSE)
- , m_Operator(0)
-{
-}
-CCodec_RLScanlineDecoder::~CCodec_RLScanlineDecoder()
-{
- if (m_pScanline) {
- FX_Free(m_pScanline);
- }
-}
-FX_BOOL CCodec_RLScanlineDecoder::CheckDestSize()
-{
- FX_DWORD i = 0;
- FX_DWORD old_size = 0;
- FX_DWORD dest_size = 0;
- while (i < m_SrcSize) {
- if (m_pSrcBuf[i] < 128) {
- old_size = dest_size;
- dest_size += m_pSrcBuf[i] + 1;
- if (dest_size < old_size) {
- return FALSE;
- }
- i += m_pSrcBuf[i] + 2;
- } else if (m_pSrcBuf[i] > 128) {
- old_size = dest_size;
- dest_size += 257 - m_pSrcBuf[i];
- if (dest_size < old_size) {
- return FALSE;
- }
- i += 2;
- } else {
- break;
- }
- }
- if (((FX_DWORD)m_OrigWidth * m_nComps * m_bpc * m_OrigHeight + 7) / 8 > dest_size) {
- return FALSE;
- }
- return TRUE;
-}
-FX_BOOL CCodec_RLScanlineDecoder::Create(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height, int nComps, int bpc)
-{
- m_pSrcBuf = src_buf;
- m_SrcSize = src_size;
- m_OutputWidth = m_OrigWidth = width;
- m_OutputHeight = m_OrigHeight = height;
- m_nComps = nComps;
- m_bpc = bpc;
- m_bColorTransformed = FALSE;
- m_DownScale = 1;
- m_Pitch = (width * nComps * bpc + 31) / 32 * 4;
- m_dwLineBytes = (width * nComps * bpc + 7) / 8;
- m_pScanline = FX_Alloc(FX_BYTE, m_Pitch);
- if (m_pScanline == NULL) {
- return FALSE;
- }
- FXSYS_memset32(m_pScanline, 0, m_Pitch);
- return CheckDestSize();
-}
-FX_BOOL CCodec_RLScanlineDecoder::v_Rewind()
-{
- FXSYS_memset32(m_pScanline, 0, m_Pitch);
- m_SrcOffset = 0;
- m_bEOD = FALSE;
- m_Operator = 0;
- return TRUE;
-}
-FX_LPBYTE CCodec_RLScanlineDecoder::v_GetNextLine()
-{
- if (m_SrcOffset == 0) {
- GetNextOperator();
- } else {
- if (m_bEOD) {
- return NULL;
- }
- }
- FXSYS_memset32(m_pScanline, 0, m_Pitch);
- FX_DWORD col_pos = 0;
- FX_BOOL eol = FALSE;
- while (m_SrcOffset < m_SrcSize && !eol) {
- if (m_Operator < 128) {
- FX_DWORD copy_len = m_Operator + 1;
- if (col_pos + copy_len >= m_dwLineBytes) {
- copy_len = m_dwLineBytes - col_pos;
- eol = TRUE;
- }
- if (copy_len >= m_SrcSize - m_SrcOffset) {
- copy_len = m_SrcSize - m_SrcOffset;
- m_bEOD = TRUE;
- }
- FXSYS_memcpy32(m_pScanline + col_pos, m_pSrcBuf + m_SrcOffset, copy_len);
- col_pos += copy_len;
- UpdateOperator((FX_BYTE)copy_len);
- } else if (m_Operator > 128) {
- int fill = 0;
- if (m_SrcOffset - 1 < m_SrcSize - 1) {
- fill = m_pSrcBuf[m_SrcOffset];
- }
- FX_DWORD duplicate_len = 257 - m_Operator;
- if (col_pos + duplicate_len >= m_dwLineBytes) {
- duplicate_len = m_dwLineBytes - col_pos;
- eol = TRUE;
- }
- FXSYS_memset8(m_pScanline + col_pos, fill, duplicate_len);
- col_pos += duplicate_len;
- UpdateOperator((FX_BYTE)duplicate_len);
- } else {
- m_bEOD = TRUE;
- break;
- }
- }
- return m_pScanline;
-}
-void CCodec_RLScanlineDecoder::GetNextOperator()
-{
- if (m_SrcOffset >= m_SrcSize) {
- m_Operator = 128;
- return;
- }
- m_Operator = m_pSrcBuf[m_SrcOffset];
- m_SrcOffset ++;
-}
-void CCodec_RLScanlineDecoder::UpdateOperator(FX_BYTE used_bytes)
-{
- if (used_bytes == 0) {
- return;
- }
- if (m_Operator < 128) {
- FXSYS_assert((FX_DWORD)m_Operator + 1 >= used_bytes);
- if (used_bytes == m_Operator + 1) {
- m_SrcOffset += used_bytes;
- GetNextOperator();
- return;
- }
- m_Operator -= used_bytes;
- m_SrcOffset += used_bytes;
- if (m_SrcOffset >= m_SrcSize) {
- m_Operator = 128;
- }
- return;
- }
- FX_BYTE count = 257 - m_Operator;
- FXSYS_assert((FX_DWORD)count >= used_bytes);
- if (used_bytes == count) {
- m_SrcOffset ++;
- GetNextOperator();
- return;
- }
- count -= used_bytes;
- m_Operator = 257 - count;
-}
-ICodec_ScanlineDecoder* CCodec_BasicModule::CreateRunLengthDecoder(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height,
- int nComps, int bpc)
-{
- CCodec_RLScanlineDecoder* pRLScanlineDecoder = FX_NEW CCodec_RLScanlineDecoder;
- if (pRLScanlineDecoder == NULL) {
- return NULL;
- }
- if (!pRLScanlineDecoder->Create(src_buf, src_size, width, height, nComps, bpc)) {
- delete pRLScanlineDecoder;
- return NULL;
- }
- return pRLScanlineDecoder;
-}
+// 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 "../../../include/fxcodec/fx_codec.h" +#include "codec_int.h" +CCodec_ModuleMgr::CCodec_ModuleMgr() +{ + m_pBasicModule = FX_NEW CCodec_BasicModule; + m_pFaxModule = FX_NEW CCodec_FaxModule; + m_pJpegModule = FX_NEW CCodec_JpegModule; + m_pJpxModule = FX_NEW CCodec_JpxModule; + m_pJbig2Module = FX_NEW CCodec_Jbig2Module; + m_pIccModule = FX_NEW CCodec_IccModule; + m_pFlateModule = FX_NEW CCodec_FlateModule; +} +CCodec_ModuleMgr::~CCodec_ModuleMgr() +{ + delete m_pBasicModule; + delete m_pFaxModule; + delete m_pJpegModule; + delete m_pFlateModule; + delete m_pJpxModule; + delete m_pJbig2Module; + delete m_pIccModule; +} +void CCodec_ModuleMgr::InitJbig2Decoder() +{ +} +void CCodec_ModuleMgr::InitJpxDecoder() +{ +} +void CCodec_ModuleMgr::InitIccDecoder() +{ +} +CCodec_ScanlineDecoder::CCodec_ScanlineDecoder() +{ + m_NextLine = -1; + m_pDataCache = NULL; + m_pLastScanline = NULL; +} +CCodec_ScanlineDecoder::~CCodec_ScanlineDecoder() +{ + if (m_pDataCache) { + FX_Free(m_pDataCache); + } +} +FX_LPBYTE CCodec_ScanlineDecoder::GetScanline(int line) +{ + if (m_pDataCache && line < m_pDataCache->m_nCachedLines) { + return &m_pDataCache->m_Data + line * m_Pitch; + } + if (m_NextLine == line + 1) { + return m_pLastScanline; + } + if (m_NextLine < 0 || m_NextLine > line) { + if (!v_Rewind()) { + return NULL; + } + m_NextLine = 0; + } + while (m_NextLine < line) { + ReadNextLine(); + m_NextLine ++; + } + m_pLastScanline = ReadNextLine(); + m_NextLine ++; + return m_pLastScanline; +} +FX_BOOL CCodec_ScanlineDecoder::SkipToScanline(int line, IFX_Pause* pPause) +{ + if (m_pDataCache && line < m_pDataCache->m_nCachedLines) { + return FALSE; + } + if (m_NextLine == line || m_NextLine == line + 1) { + return FALSE; + } + if (m_NextLine < 0 || m_NextLine > line) { + v_Rewind(); + m_NextLine = 0; + } + m_pLastScanline = NULL; + while (m_NextLine < line) { + m_pLastScanline = ReadNextLine(); + m_NextLine ++; + if (pPause && pPause->NeedToPauseNow()) { + return TRUE; + } + } + return FALSE; +} +FX_LPBYTE CCodec_ScanlineDecoder::ReadNextLine() +{ + FX_LPBYTE pLine = v_GetNextLine(); + if (pLine == NULL) { + return NULL; + } + if (m_pDataCache && m_NextLine == m_pDataCache->m_nCachedLines) { + FXSYS_memcpy32(&m_pDataCache->m_Data + m_NextLine * m_Pitch, pLine, m_Pitch); + m_pDataCache->m_nCachedLines ++; + } + return pLine; +} +void CCodec_ScanlineDecoder::DownScale(int dest_width, int dest_height) +{ + if (dest_width < 0) { + dest_width = -dest_width; + } + if (dest_height < 0) { + dest_height = -dest_height; + } + v_DownScale(dest_width, dest_height); + if (m_pDataCache) { + if (m_pDataCache->m_Height == m_OutputHeight && m_pDataCache->m_Width == m_OutputWidth) { + return; + } + FX_Free(m_pDataCache); + m_pDataCache = NULL; + } + m_pDataCache = (CCodec_ImageDataCache*)FXMEM_DefaultAlloc( + sizeof(CCodec_ImageDataCache) + m_Pitch * m_OutputHeight, FXMEM_NONLEAVE); + if (m_pDataCache == NULL) { + return; + } + m_pDataCache->m_Height = m_OutputHeight; + m_pDataCache->m_Width = m_OutputWidth; + m_pDataCache->m_nCachedLines = 0; +} +FX_BOOL CCodec_BasicModule::RunLengthEncode(const FX_BYTE* src_buf, FX_DWORD src_size, FX_LPBYTE& dest_buf, + FX_DWORD& dest_size) +{ + return FALSE; +} +extern "C" double FXstrtod(const char* nptr, char** endptr) +{ + double ret = 0.0; + const char* ptr = nptr; + const char* exp_ptr = NULL; + int e_number = 0, + e_signal = 0, + e_point = 0, + is_negative = 0; + int exp_ret = 0, exp_sig = 1, + fra_ret = 0, fra_count = 0, fra_base = 1; + if(nptr == NULL) { + return 0.0; + } + for (;; ptr++) { + if(!e_number && !e_point && (*ptr == '\t' || *ptr == ' ')) { + continue; + } + if(*ptr >= '0' && *ptr <= '9') { + if(!e_number) { + e_number = 1; + } + if(!e_point) { + ret *= 10; + ret += (*ptr - '0'); + } else { + fra_count++; + fra_ret *= 10; + fra_ret += (*ptr - '0'); + } + continue; + } + if(!e_point && *ptr == '.') { + e_point = 1; + continue; + } + if(!e_number && !e_point && !e_signal) { + switch(*ptr) { + case '-': + is_negative = 1; + case '+': + e_signal = 1; + continue; + } + } + if(e_number && (*ptr == 'e' || *ptr == 'E')) { +#define EXPONENT_DETECT(ptr) \ + for(;;ptr++){ \ + if(*ptr < '0' || *ptr > '9'){ \ + if(endptr) *endptr = (char*)ptr; \ + break; \ + }else{ \ + exp_ret *= 10; \ + exp_ret += (*ptr - '0'); \ + continue; \ + } \ + } + exp_ptr = ptr++; + if(*ptr == '+' || *ptr == '-') { + exp_sig = (*ptr++ == '+') ? 1 : -1; + if(*ptr < '0' || *ptr > '9') { + if(endptr) { + *endptr = (char*)exp_ptr; + } + break; + } + EXPONENT_DETECT(ptr); + } else if(*ptr >= '0' && *ptr <= '9') { + EXPONENT_DETECT(ptr); + } else { + if(endptr) { + *endptr = (char*)exp_ptr; + } + break; + } +#undef EXPONENT_DETECT + break; + } + if(ptr != nptr && !e_number) { + if(endptr) { + *endptr = (char*)nptr; + } + break; + } + if(endptr) { + *endptr = (char*)ptr; + } + break; + } + while(fra_count--) { + fra_base *= 10; + } + ret += (double)fra_ret / (double)fra_base; + if(exp_sig == 1) { + while(exp_ret--) { + ret *= 10.0; + } + } else { + while(exp_ret--) { + ret /= 10.0; + } + } + return is_negative ? -ret : ret; +} +FX_BOOL CCodec_BasicModule::A85Encode(const FX_BYTE* src_buf, FX_DWORD src_size, FX_LPBYTE& dest_buf, + FX_DWORD& dest_size) +{ + return FALSE; +} +CCodec_ModuleMgr* CCodec_ModuleMgr::Create() +{ + return FX_NEW CCodec_ModuleMgr; +} +void CCodec_ModuleMgr::Destroy() +{ + delete this; +} +class CCodec_RLScanlineDecoder : public CCodec_ScanlineDecoder +{ +public: + CCodec_RLScanlineDecoder(); + virtual ~CCodec_RLScanlineDecoder(); + FX_BOOL Create(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height, int nComps, int bpc); + virtual void v_DownScale(int dest_width, int dest_height) {} + virtual FX_BOOL v_Rewind(); + virtual FX_LPBYTE v_GetNextLine(); + virtual FX_DWORD GetSrcOffset() + { + return m_SrcOffset; + } +protected: + FX_BOOL CheckDestSize(); + void GetNextOperator(); + void UpdateOperator(FX_BYTE used_bytes); + + FX_LPBYTE m_pScanline; + FX_LPCBYTE m_pSrcBuf; + FX_DWORD m_SrcSize; + FX_DWORD m_dwLineBytes; + FX_DWORD m_SrcOffset; + FX_BOOL m_bEOD; + FX_BYTE m_Operator; +}; +CCodec_RLScanlineDecoder::CCodec_RLScanlineDecoder() + : m_pScanline(NULL) + , m_pSrcBuf(NULL) + , m_SrcSize(0) + , m_dwLineBytes(0) + , m_SrcOffset(0) + , m_bEOD(FALSE) + , m_Operator(0) +{ +} +CCodec_RLScanlineDecoder::~CCodec_RLScanlineDecoder() +{ + if (m_pScanline) { + FX_Free(m_pScanline); + } +} +FX_BOOL CCodec_RLScanlineDecoder::CheckDestSize() +{ + FX_DWORD i = 0; + FX_DWORD old_size = 0; + FX_DWORD dest_size = 0; + while (i < m_SrcSize) { + if (m_pSrcBuf[i] < 128) { + old_size = dest_size; + dest_size += m_pSrcBuf[i] + 1; + if (dest_size < old_size) { + return FALSE; + } + i += m_pSrcBuf[i] + 2; + } else if (m_pSrcBuf[i] > 128) { + old_size = dest_size; + dest_size += 257 - m_pSrcBuf[i]; + if (dest_size < old_size) { + return FALSE; + } + i += 2; + } else { + break; + } + } + if (((FX_DWORD)m_OrigWidth * m_nComps * m_bpc * m_OrigHeight + 7) / 8 > dest_size) { + return FALSE; + } + return TRUE; +} +FX_BOOL CCodec_RLScanlineDecoder::Create(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height, int nComps, int bpc) +{ + m_pSrcBuf = src_buf; + m_SrcSize = src_size; + m_OutputWidth = m_OrigWidth = width; + m_OutputHeight = m_OrigHeight = height; + m_nComps = nComps; + m_bpc = bpc; + m_bColorTransformed = FALSE; + m_DownScale = 1; + m_Pitch = (width * nComps * bpc + 31) / 32 * 4; + m_dwLineBytes = (width * nComps * bpc + 7) / 8; + m_pScanline = FX_Alloc(FX_BYTE, m_Pitch); + if (m_pScanline == NULL) { + return FALSE; + } + FXSYS_memset32(m_pScanline, 0, m_Pitch); + return CheckDestSize(); +} +FX_BOOL CCodec_RLScanlineDecoder::v_Rewind() +{ + FXSYS_memset32(m_pScanline, 0, m_Pitch); + m_SrcOffset = 0; + m_bEOD = FALSE; + m_Operator = 0; + return TRUE; +} +FX_LPBYTE CCodec_RLScanlineDecoder::v_GetNextLine() +{ + if (m_SrcOffset == 0) { + GetNextOperator(); + } else { + if (m_bEOD) { + return NULL; + } + } + FXSYS_memset32(m_pScanline, 0, m_Pitch); + FX_DWORD col_pos = 0; + FX_BOOL eol = FALSE; + while (m_SrcOffset < m_SrcSize && !eol) { + if (m_Operator < 128) { + FX_DWORD copy_len = m_Operator + 1; + if (col_pos + copy_len >= m_dwLineBytes) { + copy_len = m_dwLineBytes - col_pos; + eol = TRUE; + } + if (copy_len >= m_SrcSize - m_SrcOffset) { + copy_len = m_SrcSize - m_SrcOffset; + m_bEOD = TRUE; + } + FXSYS_memcpy32(m_pScanline + col_pos, m_pSrcBuf + m_SrcOffset, copy_len); + col_pos += copy_len; + UpdateOperator((FX_BYTE)copy_len); + } else if (m_Operator > 128) { + int fill = 0; + if (m_SrcOffset - 1 < m_SrcSize - 1) { + fill = m_pSrcBuf[m_SrcOffset]; + } + FX_DWORD duplicate_len = 257 - m_Operator; + if (col_pos + duplicate_len >= m_dwLineBytes) { + duplicate_len = m_dwLineBytes - col_pos; + eol = TRUE; + } + FXSYS_memset8(m_pScanline + col_pos, fill, duplicate_len); + col_pos += duplicate_len; + UpdateOperator((FX_BYTE)duplicate_len); + } else { + m_bEOD = TRUE; + break; + } + } + return m_pScanline; +} +void CCodec_RLScanlineDecoder::GetNextOperator() +{ + if (m_SrcOffset >= m_SrcSize) { + m_Operator = 128; + return; + } + m_Operator = m_pSrcBuf[m_SrcOffset]; + m_SrcOffset ++; +} +void CCodec_RLScanlineDecoder::UpdateOperator(FX_BYTE used_bytes) +{ + if (used_bytes == 0) { + return; + } + if (m_Operator < 128) { + FXSYS_assert((FX_DWORD)m_Operator + 1 >= used_bytes); + if (used_bytes == m_Operator + 1) { + m_SrcOffset += used_bytes; + GetNextOperator(); + return; + } + m_Operator -= used_bytes; + m_SrcOffset += used_bytes; + if (m_SrcOffset >= m_SrcSize) { + m_Operator = 128; + } + return; + } + FX_BYTE count = 257 - m_Operator; + FXSYS_assert((FX_DWORD)count >= used_bytes); + if (used_bytes == count) { + m_SrcOffset ++; + GetNextOperator(); + return; + } + count -= used_bytes; + m_Operator = 257 - count; +} +ICodec_ScanlineDecoder* CCodec_BasicModule::CreateRunLengthDecoder(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height, + int nComps, int bpc) +{ + CCodec_RLScanlineDecoder* pRLScanlineDecoder = FX_NEW CCodec_RLScanlineDecoder; + if (pRLScanlineDecoder == NULL) { + return NULL; + } + if (!pRLScanlineDecoder->Create(src_buf, src_size, width, height, nComps, bpc)) { + delete pRLScanlineDecoder; + return NULL; + } + return pRLScanlineDecoder; +} |