| // 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 "../../../include/fxcodec/fx_codec.h" |
| #include "../../../include/fxcrt/fx_safe_types.h" |
| #include "../../../include/fxge/fx_dib.h" |
| #include "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 == NULL || 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; |
| } |
| 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 != NULL) { |
| *icc_buf_ptr = NULL; |
| } |
| if (icc_length != NULL) { |
| *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 = (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 = (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() { |
| int nlines = jpeg_read_scanlines(&cinfo, &m_pScanlineBuf, 1); |
| if (nlines < 1) { |
| return NULL; |
| } |
| 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 == NULL || 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() != NULL) { |
| ASSERT(pSource->GetBPP() >= 8 && pSource->GetPalette() == NULL); |
| 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; |
| } |
| int CCodec_JpegModule::ReadHeader(void* pContext, |
| int* width, |
| int* height, |
| int* nComps) { |
| 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; |
| 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 != NULL) { |
| *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; |
| } |
