static FX_BOOL _JpegLoadInfo(FX_LPCBYTE src_buf, FX_DWORD src_size, int& width, int& height,
int& num_components, int& bits_per_components, FX_BOOL& color_transform,
FX_LPBYTE* 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;
}
FX_BOOL CCodec_JpegDecoder::Create(const uint8_t* src_buf,
FX_DWORD src_size,
int width,
int height,
int nComps,
FX_BOOL ColorTransform,
IFX_JpegProvider* pJP) {
if (pJP) {
m_pExtProvider = pJP;
m_pExtContext = m_pExtProvider->CreateDecoder(
src_buf, src_size, width, height, nComps, ColorTransform);
return m_pExtContext != NULL;
}
_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;
}
