diff options
Diffstat (limited to 'core/src/fxcodec/codec/fx_codec_jpeg.cpp')
| -rw-r--r-- | core/src/fxcodec/codec/fx_codec_jpeg.cpp | 692 |
1 files changed, 0 insertions, 692 deletions
diff --git a/core/src/fxcodec/codec/fx_codec_jpeg.cpp b/core/src/fxcodec/codec/fx_codec_jpeg.cpp deleted file mode 100644 index 14cc194db4..0000000000 --- a/core/src/fxcodec/codec/fx_codec_jpeg.cpp +++ /dev/null @@ -1,692 +0,0 @@ -// 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 <setjmp.h> - -#include "core/include/fxcodec/fx_codec.h" -#include "core/include/fxcrt/fx_safe_types.h" -#include "core/include/fxge/fx_dib.h" -#include "core/src/fxcodec/codec/codec_int.h" - -extern "C" { -#undef FAR -#if defined(USE_SYSTEM_LIBJPEG) -#include <jpeglib.h> -#elif defined(USE_LIBJPEG_TURBO) -#include "third_party/libjpeg_turbo/jpeglib.h" -#else -#include "third_party/libjpeg/jpeglib.h" -#endif -} - -extern "C" { -static void _JpegScanSOI(const uint8_t*& src_buf, FX_DWORD& src_size) { - if (src_size == 0) { - return; - } - FX_DWORD offset = 0; - while (offset < src_size - 1) { - if (src_buf[offset] == 0xff && src_buf[offset + 1] == 0xd8) { - src_buf += offset; - src_size -= offset; - return; - } - offset++; - } -} -}; -extern "C" { -static void _src_do_nothing(struct jpeg_decompress_struct* cinfo) {} -}; -extern "C" { -static void _error_fatal(j_common_ptr cinfo) { - longjmp(*(jmp_buf*)cinfo->client_data, -1); -} -}; -extern "C" { -static void _src_skip_data(struct jpeg_decompress_struct* cinfo, long num) { - if (num > (long)cinfo->src->bytes_in_buffer) { - _error_fatal((j_common_ptr)cinfo); - } - cinfo->src->next_input_byte += num; - cinfo->src->bytes_in_buffer -= num; -} -}; -extern "C" { -static boolean _src_fill_buffer(j_decompress_ptr cinfo) { - return 0; -} -}; -extern "C" { -static boolean _src_resync(j_decompress_ptr cinfo, int desired) { - return 0; -} -}; -extern "C" { -static void _error_do_nothing(j_common_ptr cinfo) {} -}; -extern "C" { -static void _error_do_nothing1(j_common_ptr cinfo, int) {} -}; -extern "C" { -static void _error_do_nothing2(j_common_ptr cinfo, char*) {} -}; -#define JPEG_MARKER_EXIF (JPEG_APP0 + 1) -#define JPEG_MARKER_ICC (JPEG_APP0 + 2) -#define JPEG_MARKER_AUTHORTIME (JPEG_APP0 + 3) -#define JPEG_MARKER_MAXSIZE 0xFFFF -#define JPEG_OVERHEAD_LEN 14 -static FX_BOOL _JpegEmbedIccProfile(j_compress_ptr cinfo, - const uint8_t* icc_buf_ptr, - FX_DWORD icc_length) { - if (!icc_buf_ptr || icc_length == 0) { - return FALSE; - } - FX_DWORD icc_segment_size = (JPEG_MARKER_MAXSIZE - 2 - JPEG_OVERHEAD_LEN); - FX_DWORD icc_segment_num = (icc_length / icc_segment_size) + 1; - if (icc_segment_num > 255) { - return FALSE; - } - FX_DWORD icc_data_length = - JPEG_OVERHEAD_LEN + (icc_segment_num > 1 ? icc_segment_size : icc_length); - uint8_t* icc_data = FX_Alloc(uint8_t, icc_data_length); - FXSYS_memcpy(icc_data, "\x49\x43\x43\x5f\x50\x52\x4f\x46\x49\x4c\x45\x00", - 12); - icc_data[13] = (uint8_t)icc_segment_num; - for (uint8_t i = 0; i < (icc_segment_num - 1); i++) { - icc_data[12] = i + 1; - FXSYS_memcpy(icc_data + JPEG_OVERHEAD_LEN, - icc_buf_ptr + i * icc_segment_size, icc_segment_size); - jpeg_write_marker(cinfo, JPEG_MARKER_ICC, icc_data, icc_data_length); - } - icc_data[12] = (uint8_t)icc_segment_num; - FX_DWORD icc_size = (icc_segment_num - 1) * icc_segment_size; - FXSYS_memcpy(icc_data + JPEG_OVERHEAD_LEN, icc_buf_ptr + icc_size, - icc_length - icc_size); - jpeg_write_marker(cinfo, JPEG_MARKER_ICC, icc_data, - JPEG_OVERHEAD_LEN + icc_length - icc_size); - FX_Free(icc_data); - return TRUE; -} -extern "C" { -static void _dest_do_nothing(j_compress_ptr cinfo) {} -}; -extern "C" { -static boolean _dest_empty(j_compress_ptr cinfo) { - return FALSE; -} -}; -#define JPEG_BLOCK_SIZE 1048576 -static void _JpegEncode(const CFX_DIBSource* pSource, - uint8_t*& dest_buf, - FX_STRSIZE& dest_size, - int quality, - const uint8_t* icc_buf, - FX_DWORD icc_length) { - struct jpeg_error_mgr jerr; - jerr.error_exit = _error_do_nothing; - jerr.emit_message = _error_do_nothing1; - jerr.output_message = _error_do_nothing; - jerr.format_message = _error_do_nothing2; - jerr.reset_error_mgr = _error_do_nothing; - - struct jpeg_compress_struct cinfo; - memset(&cinfo, 0, sizeof(cinfo)); - cinfo.err = &jerr; - jpeg_create_compress(&cinfo); - int Bpp = pSource->GetBPP() / 8; - FX_DWORD nComponents = Bpp >= 3 ? (pSource->IsCmykImage() ? 4 : 3) : 1; - FX_DWORD pitch = pSource->GetPitch(); - FX_DWORD width = pdfium::base::checked_cast<FX_DWORD>(pSource->GetWidth()); - FX_DWORD height = pdfium::base::checked_cast<FX_DWORD>(pSource->GetHeight()); - FX_SAFE_DWORD safe_buf_len = width; - safe_buf_len *= height; - safe_buf_len *= nComponents; - safe_buf_len += 1024; - if (icc_length) { - safe_buf_len += 255 * 18; - safe_buf_len += icc_length; - } - FX_DWORD dest_buf_length = 0; - if (!safe_buf_len.IsValid()) { - dest_buf = nullptr; - } else { - dest_buf_length = safe_buf_len.ValueOrDie(); - dest_buf = FX_TryAlloc(uint8_t, dest_buf_length); - const int MIN_TRY_BUF_LEN = 1024; - while (!dest_buf && dest_buf_length > MIN_TRY_BUF_LEN) { - dest_buf_length >>= 1; - dest_buf = FX_TryAlloc(uint8_t, dest_buf_length); - } - } - if (!dest_buf) { - FX_OutOfMemoryTerminate(); - } - struct jpeg_destination_mgr dest; - dest.init_destination = _dest_do_nothing; - dest.term_destination = _dest_do_nothing; - dest.empty_output_buffer = _dest_empty; - dest.next_output_byte = dest_buf; - dest.free_in_buffer = dest_buf_length; - cinfo.dest = &dest; - cinfo.image_width = width; - cinfo.image_height = height; - cinfo.input_components = nComponents; - if (nComponents == 1) { - cinfo.in_color_space = JCS_GRAYSCALE; - } else if (nComponents == 3) { - cinfo.in_color_space = JCS_RGB; - } else { - cinfo.in_color_space = JCS_CMYK; - } - uint8_t* line_buf = NULL; - if (nComponents > 1) { - line_buf = FX_Alloc2D(uint8_t, width, nComponents); - } - jpeg_set_defaults(&cinfo); - if (quality != 75) { - jpeg_set_quality(&cinfo, quality, TRUE); - } - jpeg_start_compress(&cinfo, TRUE); - _JpegEmbedIccProfile(&cinfo, icc_buf, icc_length); - JSAMPROW row_pointer[1]; - JDIMENSION row; - while (cinfo.next_scanline < cinfo.image_height) { - const uint8_t* src_scan = pSource->GetScanline(cinfo.next_scanline); - if (nComponents > 1) { - uint8_t* dest_scan = line_buf; - if (nComponents == 3) { - for (FX_DWORD i = 0; i < width; i++) { - dest_scan[0] = src_scan[2]; - dest_scan[1] = src_scan[1]; - dest_scan[2] = src_scan[0]; - dest_scan += 3; - src_scan += Bpp; - } - } else { - for (FX_DWORD i = 0; i < pitch; i++) { - *dest_scan++ = ~*src_scan++; - } - } - row_pointer[0] = line_buf; - } else { - row_pointer[0] = (uint8_t*)src_scan; - } - row = cinfo.next_scanline; - jpeg_write_scanlines(&cinfo, row_pointer, 1); - if (cinfo.next_scanline == row) { - dest_buf = - FX_Realloc(uint8_t, dest_buf, dest_buf_length + JPEG_BLOCK_SIZE); - dest.next_output_byte = dest_buf + dest_buf_length - dest.free_in_buffer; - dest_buf_length += JPEG_BLOCK_SIZE; - dest.free_in_buffer += JPEG_BLOCK_SIZE; - } - } - jpeg_finish_compress(&cinfo); - jpeg_destroy_compress(&cinfo); - FX_Free(line_buf); - dest_size = dest_buf_length - (FX_STRSIZE)dest.free_in_buffer; -} - -#ifdef PDF_ENABLE_XFA -static void _JpegLoadAttribute(struct jpeg_decompress_struct* pInfo, - CFX_DIBAttribute* pAttribute) { - if (pInfo == NULL || pAttribute == NULL) { - return; - } - if (pAttribute) { - pAttribute->m_nXDPI = pInfo->X_density; - pAttribute->m_nYDPI = pInfo->Y_density; - pAttribute->m_wDPIUnit = pInfo->density_unit; - } -} -#endif // PDF_ENABLE_XFA - -static FX_BOOL _JpegLoadInfo(const uint8_t* src_buf, - FX_DWORD src_size, - int& width, - int& height, - int& num_components, - int& bits_per_components, - FX_BOOL& color_transform, - uint8_t** icc_buf_ptr, - FX_DWORD* icc_length) { - _JpegScanSOI(src_buf, src_size); - struct jpeg_decompress_struct cinfo; - struct jpeg_error_mgr jerr; - jerr.error_exit = _error_fatal; - jerr.emit_message = _error_do_nothing1; - jerr.output_message = _error_do_nothing; - jerr.format_message = _error_do_nothing2; - jerr.reset_error_mgr = _error_do_nothing; - jerr.trace_level = 0; - cinfo.err = &jerr; - jmp_buf mark; - cinfo.client_data = &mark; - if (setjmp(mark) == -1) { - return FALSE; - } - jpeg_create_decompress(&cinfo); - struct jpeg_source_mgr src; - src.init_source = _src_do_nothing; - src.term_source = _src_do_nothing; - src.skip_input_data = _src_skip_data; - src.fill_input_buffer = _src_fill_buffer; - src.resync_to_restart = _src_resync; - src.bytes_in_buffer = src_size; - src.next_input_byte = src_buf; - cinfo.src = &src; - if (setjmp(mark) == -1) { - jpeg_destroy_decompress(&cinfo); - return FALSE; - } - if (icc_buf_ptr && icc_length) { - jpeg_save_markers(&cinfo, JPEG_MARKER_ICC, JPEG_MARKER_MAXSIZE); - } - int ret = jpeg_read_header(&cinfo, TRUE); - if (ret != JPEG_HEADER_OK) { - jpeg_destroy_decompress(&cinfo); - return FALSE; - } - width = cinfo.image_width; - height = cinfo.image_height; - num_components = cinfo.num_components; - color_transform = - cinfo.jpeg_color_space == JCS_YCbCr || cinfo.jpeg_color_space == JCS_YCCK; - bits_per_components = cinfo.data_precision; - if (icc_buf_ptr) { - *icc_buf_ptr = NULL; - } - if (icc_length) { - *icc_length = 0; - } - jpeg_destroy_decompress(&cinfo); - return TRUE; -} - -class CCodec_JpegDecoder : public CCodec_ScanlineDecoder { - public: - CCodec_JpegDecoder(); - ~CCodec_JpegDecoder() override; - - FX_BOOL Create(const uint8_t* src_buf, - FX_DWORD src_size, - int width, - int height, - int nComps, - FX_BOOL ColorTransform); - void Destroy() { delete this; } - - // CCodec_ScanlineDecoder - void v_DownScale(int dest_width, int dest_height) override; - FX_BOOL v_Rewind() override; - uint8_t* v_GetNextLine() override; - FX_DWORD GetSrcOffset() override; - - FX_BOOL InitDecode(); - - jmp_buf m_JmpBuf; - struct jpeg_decompress_struct cinfo; - struct jpeg_error_mgr jerr; - struct jpeg_source_mgr src; - const uint8_t* m_SrcBuf; - FX_DWORD m_SrcSize; - uint8_t* m_pScanlineBuf; - - FX_BOOL m_bInited; - FX_BOOL m_bStarted; - FX_BOOL m_bJpegTransform; - - protected: - FX_DWORD m_nDefaultScaleDenom; -}; - -CCodec_JpegDecoder::CCodec_JpegDecoder() { - m_pScanlineBuf = NULL; - m_DownScale = 1; - m_bStarted = FALSE; - m_bInited = FALSE; - FXSYS_memset(&cinfo, 0, sizeof(cinfo)); - FXSYS_memset(&jerr, 0, sizeof(jerr)); - FXSYS_memset(&src, 0, sizeof(src)); - m_nDefaultScaleDenom = 1; -} -CCodec_JpegDecoder::~CCodec_JpegDecoder() { - FX_Free(m_pScanlineBuf); - if (m_bInited) { - jpeg_destroy_decompress(&cinfo); - } -} -FX_BOOL CCodec_JpegDecoder::InitDecode() { - cinfo.err = &jerr; - cinfo.client_data = &m_JmpBuf; - if (setjmp(m_JmpBuf) == -1) { - return FALSE; - } - jpeg_create_decompress(&cinfo); - m_bInited = TRUE; - cinfo.src = &src; - src.bytes_in_buffer = m_SrcSize; - src.next_input_byte = m_SrcBuf; - if (setjmp(m_JmpBuf) == -1) { - jpeg_destroy_decompress(&cinfo); - m_bInited = FALSE; - return FALSE; - } - cinfo.image_width = m_OrigWidth; - cinfo.image_height = m_OrigHeight; - int ret = jpeg_read_header(&cinfo, TRUE); - if (ret != JPEG_HEADER_OK) { - return FALSE; - } - if (cinfo.saw_Adobe_marker) { - m_bJpegTransform = TRUE; - } - if (cinfo.num_components == 3 && !m_bJpegTransform) { - cinfo.out_color_space = cinfo.jpeg_color_space; - } - m_OrigWidth = cinfo.image_width; - m_OrigHeight = cinfo.image_height; - m_OutputWidth = m_OrigWidth; - m_OutputHeight = m_OrigHeight; - m_nDefaultScaleDenom = cinfo.scale_denom; - return TRUE; -} -FX_BOOL CCodec_JpegDecoder::Create(const uint8_t* src_buf, - FX_DWORD src_size, - int width, - int height, - int nComps, - FX_BOOL ColorTransform) { - _JpegScanSOI(src_buf, src_size); - m_SrcBuf = src_buf; - m_SrcSize = src_size; - jerr.error_exit = _error_fatal; - jerr.emit_message = _error_do_nothing1; - jerr.output_message = _error_do_nothing; - jerr.format_message = _error_do_nothing2; - jerr.reset_error_mgr = _error_do_nothing; - src.init_source = _src_do_nothing; - src.term_source = _src_do_nothing; - src.skip_input_data = _src_skip_data; - src.fill_input_buffer = _src_fill_buffer; - src.resync_to_restart = _src_resync; - m_bJpegTransform = ColorTransform; - if (src_size > 1 && - FXSYS_memcmp(src_buf + src_size - 2, "\xFF\xD9", 2) != 0) { - ((uint8_t*)src_buf)[src_size - 2] = 0xFF; - ((uint8_t*)src_buf)[src_size - 1] = 0xD9; - } - m_OutputWidth = m_OrigWidth = width; - m_OutputHeight = m_OrigHeight = height; - if (!InitDecode()) { - return FALSE; - } - if (cinfo.num_components < nComps) { - return FALSE; - } - if ((int)cinfo.image_width < width) { - return FALSE; - } - m_Pitch = - (static_cast<FX_DWORD>(cinfo.image_width) * cinfo.num_components + 3) / - 4 * 4; - m_pScanlineBuf = FX_Alloc(uint8_t, m_Pitch); - m_nComps = cinfo.num_components; - m_bpc = 8; - m_bColorTransformed = FALSE; - m_bStarted = FALSE; - return TRUE; -} -extern "C" { -int32_t FX_GetDownsampleRatio(int32_t originWidth, - int32_t originHeight, - int32_t downsampleWidth, - int32_t downsampleHeight) { - int iratio_w = originWidth / downsampleWidth; - int iratio_h = originHeight / downsampleHeight; - int ratio = (iratio_w > iratio_h) ? iratio_h : iratio_w; - if (ratio >= 8) { - return 8; - } - if (ratio >= 4) { - return 4; - } - if (ratio >= 2) { - return 2; - } - return 1; -} -} -void CCodec_JpegDecoder::v_DownScale(int dest_width, int dest_height) { - int old_scale = m_DownScale; - m_DownScale = - FX_GetDownsampleRatio(m_OrigWidth, m_OrigHeight, dest_width, dest_height); - m_OutputWidth = (m_OrigWidth + m_DownScale - 1) / m_DownScale; - m_OutputHeight = (m_OrigHeight + m_DownScale - 1) / m_DownScale; - m_Pitch = (static_cast<FX_DWORD>(m_OutputWidth) * m_nComps + 3) / 4 * 4; - if (old_scale != m_DownScale) { - m_NextLine = -1; - } -} -FX_BOOL CCodec_JpegDecoder::v_Rewind() { - if (m_bStarted) { - jpeg_destroy_decompress(&cinfo); - if (!InitDecode()) { - return FALSE; - } - } - if (setjmp(m_JmpBuf) == -1) { - return FALSE; - } - cinfo.scale_denom = m_nDefaultScaleDenom * m_DownScale; - m_OutputWidth = (m_OrigWidth + m_DownScale - 1) / m_DownScale; - m_OutputHeight = (m_OrigHeight + m_DownScale - 1) / m_DownScale; - if (!jpeg_start_decompress(&cinfo)) { - jpeg_destroy_decompress(&cinfo); - return FALSE; - } - if ((int)cinfo.output_width > m_OrigWidth) { - FXSYS_assert(FALSE); - return FALSE; - } - m_bStarted = TRUE; - return TRUE; -} -uint8_t* CCodec_JpegDecoder::v_GetNextLine() { - if (setjmp(m_JmpBuf) == -1) - return nullptr; - - int nlines = jpeg_read_scanlines(&cinfo, &m_pScanlineBuf, 1); - if (nlines < 1) { - return nullptr; - } - return m_pScanlineBuf; -} -FX_DWORD CCodec_JpegDecoder::GetSrcOffset() { - return (FX_DWORD)(m_SrcSize - src.bytes_in_buffer); -} -ICodec_ScanlineDecoder* CCodec_JpegModule::CreateDecoder( - const uint8_t* src_buf, - FX_DWORD src_size, - int width, - int height, - int nComps, - FX_BOOL ColorTransform) { - if (!src_buf || src_size == 0) { - return NULL; - } - CCodec_JpegDecoder* pDecoder = new CCodec_JpegDecoder; - if (!pDecoder->Create(src_buf, src_size, width, height, nComps, - ColorTransform)) { - delete pDecoder; - return NULL; - } - return pDecoder; -} -FX_BOOL CCodec_JpegModule::LoadInfo(const uint8_t* src_buf, - FX_DWORD src_size, - int& width, - int& height, - int& num_components, - int& bits_per_components, - FX_BOOL& color_transform, - uint8_t** icc_buf_ptr, - FX_DWORD* icc_length) { - return _JpegLoadInfo(src_buf, src_size, width, height, num_components, - bits_per_components, color_transform, icc_buf_ptr, - icc_length); -} -FX_BOOL CCodec_JpegModule::Encode(const CFX_DIBSource* pSource, - uint8_t*& dest_buf, - FX_STRSIZE& dest_size, - int quality, - const uint8_t* icc_buf, - FX_DWORD icc_length) { - if (pSource->GetBPP() < 8 || pSource->GetPalette()) - return FALSE; - - _JpegEncode(pSource, dest_buf, dest_size, quality, icc_buf, icc_length); - return TRUE; -} -struct FXJPEG_Context { - jmp_buf m_JumpMark; - jpeg_decompress_struct m_Info; - jpeg_error_mgr m_ErrMgr; - jpeg_source_mgr m_SrcMgr; - unsigned int m_SkipSize; - void* (*m_AllocFunc)(unsigned int); - void (*m_FreeFunc)(void*); -}; -extern "C" { -static void _error_fatal1(j_common_ptr cinfo) { - longjmp(((FXJPEG_Context*)cinfo->client_data)->m_JumpMark, -1); -} -}; -extern "C" { -static void _src_skip_data1(struct jpeg_decompress_struct* cinfo, long num) { - if (cinfo->src->bytes_in_buffer < (size_t)num) { - ((FXJPEG_Context*)cinfo->client_data)->m_SkipSize = - (unsigned int)(num - cinfo->src->bytes_in_buffer); - cinfo->src->bytes_in_buffer = 0; - } else { - cinfo->src->next_input_byte += num; - cinfo->src->bytes_in_buffer -= num; - } -} -}; -static void* jpeg_alloc_func(unsigned int size) { - return FX_Alloc(char, size); -} -static void jpeg_free_func(void* p) { - FX_Free(p); -} -void* CCodec_JpegModule::Start() { - FXJPEG_Context* p = FX_Alloc(FXJPEG_Context, 1); - p->m_AllocFunc = jpeg_alloc_func; - p->m_FreeFunc = jpeg_free_func; - p->m_ErrMgr.error_exit = _error_fatal1; - p->m_ErrMgr.emit_message = _error_do_nothing1; - p->m_ErrMgr.output_message = _error_do_nothing; - p->m_ErrMgr.format_message = _error_do_nothing2; - p->m_ErrMgr.reset_error_mgr = _error_do_nothing; - p->m_SrcMgr.init_source = _src_do_nothing; - p->m_SrcMgr.term_source = _src_do_nothing; - p->m_SrcMgr.skip_input_data = _src_skip_data1; - p->m_SrcMgr.fill_input_buffer = _src_fill_buffer; - p->m_SrcMgr.resync_to_restart = _src_resync; - p->m_Info.client_data = p; - p->m_Info.err = &p->m_ErrMgr; - if (setjmp(p->m_JumpMark) == -1) { - return 0; - } - jpeg_create_decompress(&p->m_Info); - p->m_Info.src = &p->m_SrcMgr; - p->m_SkipSize = 0; - return p; -} -void CCodec_JpegModule::Finish(void* pContext) { - FXJPEG_Context* p = (FXJPEG_Context*)pContext; - jpeg_destroy_decompress(&p->m_Info); - p->m_FreeFunc(p); -} -void CCodec_JpegModule::Input(void* pContext, - const unsigned char* src_buf, - FX_DWORD src_size) { - FXJPEG_Context* p = (FXJPEG_Context*)pContext; - if (p->m_SkipSize) { - if (p->m_SkipSize > src_size) { - p->m_SrcMgr.bytes_in_buffer = 0; - p->m_SkipSize -= src_size; - return; - } - src_size -= p->m_SkipSize; - src_buf += p->m_SkipSize; - p->m_SkipSize = 0; - } - p->m_SrcMgr.next_input_byte = src_buf; - p->m_SrcMgr.bytes_in_buffer = src_size; -} - -#ifdef PDF_ENABLE_XFA -int CCodec_JpegModule::ReadHeader(void* pContext, - int* width, - int* height, - int* nComps, - CFX_DIBAttribute* pAttribute) { -#else // PDF_ENABLE_XFA -int CCodec_JpegModule::ReadHeader(void* pContext, - int* width, - int* height, - int* nComps) { -#endif // PDF_ENABLE_XFA - FXJPEG_Context* p = (FXJPEG_Context*)pContext; - if (setjmp(p->m_JumpMark) == -1) { - return 1; - } - int ret = jpeg_read_header(&p->m_Info, true); - if (ret == JPEG_SUSPENDED) { - return 2; - } - if (ret != JPEG_HEADER_OK) { - return 1; - } - *width = p->m_Info.image_width; - *height = p->m_Info.image_height; - *nComps = p->m_Info.num_components; -#ifdef PDF_ENABLE_XFA - _JpegLoadAttribute(&p->m_Info, pAttribute); -#endif - return 0; -} -int CCodec_JpegModule::StartScanline(void* pContext, int down_scale) { - FXJPEG_Context* p = (FXJPEG_Context*)pContext; - if (setjmp(p->m_JumpMark) == -1) { - return 0; - } - p->m_Info.scale_denom = down_scale; - return jpeg_start_decompress(&p->m_Info); -} -FX_BOOL CCodec_JpegModule::ReadScanline(void* pContext, - unsigned char* dest_buf) { - FXJPEG_Context* p = (FXJPEG_Context*)pContext; - if (setjmp(p->m_JumpMark) == -1) { - return FALSE; - } - int nlines = jpeg_read_scanlines(&p->m_Info, &dest_buf, 1); - return nlines == 1; -} -FX_DWORD CCodec_JpegModule::GetAvailInput(void* pContext, - uint8_t** avail_buf_ptr) { - if (avail_buf_ptr) { - *avail_buf_ptr = NULL; - if (((FXJPEG_Context*)pContext)->m_SrcMgr.bytes_in_buffer > 0) { - *avail_buf_ptr = - (uint8_t*)((FXJPEG_Context*)pContext)->m_SrcMgr.next_input_byte; - } - } - return (FX_DWORD)((FXJPEG_Context*)pContext)->m_SrcMgr.bytes_in_buffer; -} |