// ========================================================== // JPEG Loader and writer // Based on code developed by The Independent JPEG Group // // Design and implementation by // - Floris van den Berg (flvdberg@wxs.nl) // - Jan L. Nauta (jln@magentammt.com) // - Markus Loibl (markus.loibl@epost.de) // - Karl-Heinz Bussian (khbussian@moss.de) // - Hervé Drolon (drolon@infonie.fr) // - Jascha Wetzel (jascha@mainia.de) // - Mihail Naydenov (mnaydenov@users.sourceforge.net) // // This file is part of FreeImage 3 // // COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY // OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES // THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE // OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED // CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT // THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY // SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL // PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER // THIS DISCLAIMER. // // Use at your own risk! // ========================================================== #ifdef _MSC_VER #pragma warning (disable : 4786) // identifier was truncated to 'number' characters #endif extern "C" { #define XMD_H #undef FAR #include #include "../LibJPEG/jinclude.h" #include "../LibJPEG/jpeglib.h" #include "../LibJPEG/jerror.h" } #include "FreeImage.h" #include "Utilities.h" #include "../Metadata/FreeImageTag.h" // ========================================================== // Plugin Interface // ========================================================== static int s_format_id; // ---------------------------------------------------------- // Constant declarations // ---------------------------------------------------------- #define INPUT_BUF_SIZE 4096 // choose an efficiently fread'able size #define OUTPUT_BUF_SIZE 4096 // choose an efficiently fwrite'able size #define EXIF_MARKER (JPEG_APP0+1) // EXIF marker / Adobe XMP marker #define ICC_MARKER (JPEG_APP0+2) // ICC profile marker #define IPTC_MARKER (JPEG_APP0+13) // IPTC marker / BIM marker #define ICC_HEADER_SIZE 14 // size of non-profile data in APP2 #define MAX_BYTES_IN_MARKER 65533L // maximum data length of a JPEG marker #define MAX_DATA_BYTES_IN_MARKER 65519L // maximum data length of a JPEG APP2 marker #define MAX_JFXX_THUMB_SIZE (MAX_BYTES_IN_MARKER - 5 - 1) #define JFXX_TYPE_JPEG 0x10 // JFIF extension marker: JPEG-compressed thumbnail image #define JFXX_TYPE_8bit 0x11 // JFIF extension marker: palette thumbnail image #define JFXX_TYPE_24bit 0x13 // JFIF extension marker: RGB thumbnail image // ---------------------------------------------------------- // Typedef declarations // ---------------------------------------------------------- typedef struct tagErrorManager { /// "public" fields struct jpeg_error_mgr pub; /// for return to caller jmp_buf setjmp_buffer; } ErrorManager; typedef struct tagSourceManager { /// public fields struct jpeg_source_mgr pub; /// source stream fi_handle infile; FreeImageIO *m_io; /// start of buffer JOCTET * buffer; /// have we gotten any data yet ? boolean start_of_file; } SourceManager; typedef struct tagDestinationManager { /// public fields struct jpeg_destination_mgr pub; /// destination stream fi_handle outfile; FreeImageIO *m_io; /// start of buffer JOCTET * buffer; } DestinationManager; typedef SourceManager* freeimage_src_ptr; typedef DestinationManager* freeimage_dst_ptr; typedef ErrorManager* freeimage_error_ptr; // ---------------------------------------------------------- // Error handling // ---------------------------------------------------------- /** Fatal errors (print message and exit) */ static inline void JPEG_EXIT(j_common_ptr cinfo, int code) { freeimage_error_ptr error_ptr = (freeimage_error_ptr)cinfo->err; error_ptr->pub.msg_code = code; error_ptr->pub.error_exit(cinfo); } /** Nonfatal errors (we can keep going, but the data is probably corrupt) */ static inline void JPEG_WARNING(j_common_ptr cinfo, int code) { freeimage_error_ptr error_ptr = (freeimage_error_ptr)cinfo->err; error_ptr->pub.msg_code = code; error_ptr->pub.emit_message(cinfo, -1); } /** Receives control for a fatal error. Information sufficient to generate the error message has been stored in cinfo->err; call output_message to display it. Control must NOT return to the caller; generally this routine will exit() or longjmp() somewhere. */ METHODDEF(void) jpeg_error_exit (j_common_ptr cinfo) { freeimage_error_ptr error_ptr = (freeimage_error_ptr)cinfo->err; // always display the message error_ptr->pub.output_message(cinfo); // allow JPEG with unknown markers if(error_ptr->pub.msg_code != JERR_UNKNOWN_MARKER) { // let the memory manager delete any temp files before we die jpeg_destroy(cinfo); // return control to the setjmp point longjmp(error_ptr->setjmp_buffer, 1); } } /** Actual output of any JPEG message. Note that this method does not know how to generate a message, only where to send it. */ METHODDEF(void) jpeg_output_message (j_common_ptr cinfo) { char buffer[JMSG_LENGTH_MAX]; freeimage_error_ptr error_ptr = (freeimage_error_ptr)cinfo->err; // create the message error_ptr->pub.format_message(cinfo, buffer); // send it to user's message proc FreeImage_OutputMessageProc(s_format_id, buffer); } // ---------------------------------------------------------- // Destination manager // ---------------------------------------------------------- /** Initialize destination. This is called by jpeg_start_compress() before any data is actually written. It must initialize next_output_byte and free_in_buffer. free_in_buffer must be initialized to a positive value. */ METHODDEF(void) init_destination (j_compress_ptr cinfo) { freeimage_dst_ptr dest = (freeimage_dst_ptr) cinfo->dest; dest->buffer = (JOCTET *) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, OUTPUT_BUF_SIZE * sizeof(JOCTET)); dest->pub.next_output_byte = dest->buffer; dest->pub.free_in_buffer = OUTPUT_BUF_SIZE; } /** This is called whenever the buffer has filled (free_in_buffer reaches zero). In typical applications, it should write out the *entire* buffer (use the saved start address and buffer length; ignore the current state of next_output_byte and free_in_buffer). Then reset the pointer & count to the start of the buffer, and return TRUE indicating that the buffer has been dumped. free_in_buffer must be set to a positive value when TRUE is returned. A FALSE return should only be used when I/O suspension is desired. */ METHODDEF(boolean) empty_output_buffer (j_compress_ptr cinfo) { freeimage_dst_ptr dest = (freeimage_dst_ptr) cinfo->dest; if (dest->m_io->write_proc(dest->buffer, 1, OUTPUT_BUF_SIZE, dest->outfile) != OUTPUT_BUF_SIZE) { // let the memory manager delete any temp files before we die jpeg_destroy((j_common_ptr)cinfo); JPEG_EXIT((j_common_ptr)cinfo, JERR_FILE_WRITE); } dest->pub.next_output_byte = dest->buffer; dest->pub.free_in_buffer = OUTPUT_BUF_SIZE; return TRUE; } /** Terminate destination --- called by jpeg_finish_compress() after all data has been written. In most applications, this must flush any data remaining in the buffer. Use either next_output_byte or free_in_buffer to determine how much data is in the buffer. */ METHODDEF(void) term_destination (j_compress_ptr cinfo) { freeimage_dst_ptr dest = (freeimage_dst_ptr) cinfo->dest; size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer; // write any data remaining in the buffer if (datacount > 0) { if (dest->m_io->write_proc(dest->buffer, 1, (unsigned int)datacount, dest->outfile) != datacount) { // let the memory manager delete any temp files before we die jpeg_destroy((j_common_ptr)cinfo); JPEG_EXIT((j_common_ptr)cinfo, JERR_FILE_WRITE); } } } // ---------------------------------------------------------- // Source manager // ---------------------------------------------------------- /** Initialize source. This is called by jpeg_read_header() before any data is actually read. Unlike init_destination(), it may leave bytes_in_buffer set to 0 (in which case a fill_input_buffer() call will occur immediately). */ METHODDEF(void) init_source (j_decompress_ptr cinfo) { freeimage_src_ptr src = (freeimage_src_ptr) cinfo->src; /* We reset the empty-input-file flag for each image, * but we don't clear the input buffer. * This is correct behavior for reading a series of images from one source. */ src->start_of_file = TRUE; } /** This is called whenever bytes_in_buffer has reached zero and more data is wanted. In typical applications, it should read fresh data into the buffer (ignoring the current state of next_input_byte and bytes_in_buffer), reset the pointer & count to the start of the buffer, and return TRUE indicating that the buffer has been reloaded. It is not necessary to fill the buffer entirely, only to obtain at least one more byte. bytes_in_buffer MUST be set to a positive value if TRUE is returned. A FALSE return should only be used when I/O suspension is desired. */ METHODDEF(boolean) fill_input_buffer (j_decompress_ptr cinfo) { freeimage_src_ptr src = (freeimage_src_ptr) cinfo->src; size_t nbytes = src->m_io->read_proc(src->buffer, 1, INPUT_BUF_SIZE, src->infile); if (nbytes <= 0) { if (src->start_of_file) { // treat empty input file as fatal error // let the memory manager delete any temp files before we die jpeg_destroy((j_common_ptr)cinfo); JPEG_EXIT((j_common_ptr)cinfo, JERR_INPUT_EMPTY); } JPEG_WARNING((j_common_ptr)cinfo, JWRN_JPEG_EOF); /* Insert a fake EOI marker */ src->buffer[0] = (JOCTET) 0xFF; src->buffer[1] = (JOCTET) JPEG_EOI; nbytes = 2; } src->pub.next_input_byte = src->buffer; src->pub.bytes_in_buffer = nbytes; src->start_of_file = FALSE; return TRUE; } /** Skip num_bytes worth of data. The buffer pointer and count should be advanced over num_bytes input bytes, refilling the buffer as needed. This is used to skip over a potentially large amount of uninteresting data (such as an APPn marker). In some applications it may be possible to optimize away the reading of the skipped data, but it's not clear that being smart is worth much trouble; large skips are uncommon. bytes_in_buffer may be zero on return. A zero or negative skip count should be treated as a no-op. */ METHODDEF(void) skip_input_data (j_decompress_ptr cinfo, long num_bytes) { freeimage_src_ptr src = (freeimage_src_ptr) cinfo->src; /* Just a dumb implementation for now. Could use fseek() except * it doesn't work on pipes. Not clear that being smart is worth * any trouble anyway --- large skips are infrequent. */ if (num_bytes > 0) { while (num_bytes > (long) src->pub.bytes_in_buffer) { num_bytes -= (long) src->pub.bytes_in_buffer; (void) fill_input_buffer(cinfo); /* note we assume that fill_input_buffer will never return FALSE, * so suspension need not be handled. */ } src->pub.next_input_byte += (size_t) num_bytes; src->pub.bytes_in_buffer -= (size_t) num_bytes; } } /** Terminate source --- called by jpeg_finish_decompress after all data has been read. Often a no-op. NB: *not* called by jpeg_abort or jpeg_destroy; surrounding application must deal with any cleanup that should happen even for error exit. */ METHODDEF(void) term_source (j_decompress_ptr cinfo) { // no work necessary here } // ---------------------------------------------------------- // Source manager & Destination manager setup // ---------------------------------------------------------- /** Prepare for input from a stdio stream. The caller must have already opened the stream, and is responsible for closing it after finishing decompression. */ GLOBAL(void) jpeg_freeimage_src (j_decompress_ptr cinfo, fi_handle infile, FreeImageIO *io) { freeimage_src_ptr src; // allocate memory for the buffer. is released automatically in the end if (cinfo->src == NULL) { cinfo->src = (struct jpeg_source_mgr *) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof(SourceManager)); src = (freeimage_src_ptr) cinfo->src; src->buffer = (JOCTET *) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, INPUT_BUF_SIZE * sizeof(JOCTET)); } // initialize the jpeg pointer struct with pointers to functions src = (freeimage_src_ptr) cinfo->src; src->pub.init_source = init_source; src->pub.fill_input_buffer = fill_input_buffer; src->pub.skip_input_data = skip_input_data; src->pub.resync_to_restart = jpeg_resync_to_restart; // use default method src->pub.term_source = term_source; src->infile = infile; src->m_io = io; src->pub.bytes_in_buffer = 0; // forces fill_input_buffer on first read src->pub.next_input_byte = NULL; // until buffer loaded } /** Prepare for output to a stdio stream. The caller must have already opened the stream, and is responsible for closing it after finishing compression. */ GLOBAL(void) jpeg_freeimage_dst (j_compress_ptr cinfo, fi_handle outfile, FreeImageIO *io) { freeimage_dst_ptr dest; if (cinfo->dest == NULL) { cinfo->dest = (struct jpeg_destination_mgr *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof(DestinationManager)); } dest = (freeimage_dst_ptr) cinfo->dest; dest->pub.init_destination = init_destination; dest->pub.empty_output_buffer = empty_output_buffer; dest->pub.term_destination = term_destination; dest->outfile = outfile; dest->m_io = io; } // ---------------------------------------------------------- // Special markers read functions // ---------------------------------------------------------- /** Read JPEG_COM marker (comment) */ static BOOL jpeg_read_comment(FIBITMAP *dib, const BYTE *dataptr, unsigned int datalen) { size_t length = datalen; BYTE *profile = (BYTE*)dataptr; // read the comment char *value = (char*)malloc((length + 1) * sizeof(char)); if(value == NULL) return FALSE; memcpy(value, profile, length); value[length] = '\0'; // create a tag FITAG *tag = FreeImage_CreateTag(); if(tag) { unsigned int count = (unsigned int)length + 1; // includes the null value FreeImage_SetTagID(tag, JPEG_COM); FreeImage_SetTagKey(tag, "Comment"); FreeImage_SetTagLength(tag, count); FreeImage_SetTagCount(tag, count); FreeImage_SetTagType(tag, FIDT_ASCII); FreeImage_SetTagValue(tag, value); // store the tag FreeImage_SetMetadata(FIMD_COMMENTS, dib, FreeImage_GetTagKey(tag), tag); // destroy the tag FreeImage_DeleteTag(tag); } free(value); return TRUE; } /** Read JPEG_APP2 marker (ICC profile) */ /** Handy subroutine to test whether a saved marker is an ICC profile marker. */ static BOOL marker_is_icc(jpeg_saved_marker_ptr marker) { // marker identifying string "ICC_PROFILE" (null-terminated) const BYTE icc_signature[12] = { 0x49, 0x43, 0x43, 0x5F, 0x50, 0x52, 0x4F, 0x46, 0x49, 0x4C, 0x45, 0x00 }; if(marker->marker == ICC_MARKER) { // verify the identifying string if(marker->data_length >= ICC_HEADER_SIZE) { if(memcmp(icc_signature, marker->data, sizeof(icc_signature)) == 0) { return TRUE; } } } return FALSE; } /** See if there was an ICC profile in the JPEG file being read; if so, reassemble and return the profile data. TRUE is returned if an ICC profile was found, FALSE if not. If TRUE is returned, *icc_data_ptr is set to point to the returned data, and *icc_data_len is set to its length. IMPORTANT: the data at **icc_data_ptr has been allocated with malloc() and must be freed by the caller with free() when the caller no longer needs it. (Alternatively, we could write this routine to use the IJG library's memory allocator, so that the data would be freed implicitly at jpeg_finish_decompress() time. But it seems likely that many apps will prefer to have the data stick around after decompression finishes.) NOTE: if the file contains invalid ICC APP2 markers, we just silently return FALSE. You might want to issue an error message instead. */ static BOOL jpeg_read_icc_profile(j_decompress_ptr cinfo, JOCTET **icc_data_ptr, unsigned *icc_data_len) { jpeg_saved_marker_ptr marker; int num_markers = 0; int seq_no; JOCTET *icc_data; unsigned total_length; const int MAX_SEQ_NO = 255; // sufficient since marker numbers are bytes BYTE marker_present[MAX_SEQ_NO+1]; // 1 if marker found unsigned data_length[MAX_SEQ_NO+1]; // size of profile data in marker unsigned data_offset[MAX_SEQ_NO+1]; // offset for data in marker *icc_data_ptr = NULL; // avoid confusion if FALSE return *icc_data_len = 0; /** this first pass over the saved markers discovers whether there are any ICC markers and verifies the consistency of the marker numbering. */ memset(marker_present, 0, (MAX_SEQ_NO + 1)); for(marker = cinfo->marker_list; marker != NULL; marker = marker->next) { if (marker_is_icc(marker)) { if (num_markers == 0) { // number of markers num_markers = GETJOCTET(marker->data[13]); } else if (num_markers != GETJOCTET(marker->data[13])) { return FALSE; // inconsistent num_markers fields } // sequence number seq_no = GETJOCTET(marker->data[12]); if (seq_no <= 0 || seq_no > num_markers) { return FALSE; // bogus sequence number } if (marker_present[seq_no]) { return FALSE; // duplicate sequence numbers } marker_present[seq_no] = 1; data_length[seq_no] = marker->data_length - ICC_HEADER_SIZE; } } if (num_markers == 0) return FALSE; /** check for missing markers, count total space needed, compute offset of each marker's part of the data. */ total_length = 0; for(seq_no = 1; seq_no <= num_markers; seq_no++) { if (marker_present[seq_no] == 0) { return FALSE; // missing sequence number } data_offset[seq_no] = total_length; total_length += data_length[seq_no]; } if (total_length <= 0) return FALSE; // found only empty markers ? // allocate space for assembled data icc_data = (JOCTET *) malloc(total_length * sizeof(JOCTET)); if (icc_data == NULL) return FALSE; // out of memory // and fill it in for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) { if (marker_is_icc(marker)) { JOCTET FAR *src_ptr; JOCTET *dst_ptr; unsigned length; seq_no = GETJOCTET(marker->data[12]); dst_ptr = icc_data + data_offset[seq_no]; src_ptr = marker->data + ICC_HEADER_SIZE; length = data_length[seq_no]; while (length--) { *dst_ptr++ = *src_ptr++; } } } *icc_data_ptr = icc_data; *icc_data_len = total_length; return TRUE; } /** Read JPEG_APPD marker (IPTC or Adobe Photoshop profile) */ static BOOL jpeg_read_iptc_profile(FIBITMAP *dib, const BYTE *dataptr, unsigned int datalen) { return read_iptc_profile(dib, dataptr, datalen); } /** Read JPEG_APP1 marker (XMP profile) @param dib Input FIBITMAP @param dataptr Pointer to the APP1 marker @param datalen APP1 marker length @return Returns TRUE if successful, FALSE otherwise */ static BOOL jpeg_read_xmp_profile(FIBITMAP *dib, const BYTE *dataptr, unsigned int datalen) { // marker identifying string for XMP (null terminated) const char *xmp_signature = "http://ns.adobe.com/xap/1.0/"; // XMP signature is 29 bytes long const size_t xmp_signature_size = strlen(xmp_signature) + 1; size_t length = datalen; BYTE *profile = (BYTE*)dataptr; if(length <= xmp_signature_size) { // avoid reading corrupted or empty data return FALSE; } // verify the identifying string if(memcmp(xmp_signature, profile, strlen(xmp_signature)) == 0) { // XMP profile profile += xmp_signature_size; length -= xmp_signature_size; // create a tag FITAG *tag = FreeImage_CreateTag(); if(tag) { FreeImage_SetTagID(tag, JPEG_APP0+1); // 0xFFE1 FreeImage_SetTagKey(tag, g_TagLib_XMPFieldName); FreeImage_SetTagLength(tag, (DWORD)length); FreeImage_SetTagCount(tag, (DWORD)length); FreeImage_SetTagType(tag, FIDT_ASCII); FreeImage_SetTagValue(tag, profile); // store the tag FreeImage_SetMetadata(FIMD_XMP, dib, FreeImage_GetTagKey(tag), tag); // destroy the tag FreeImage_DeleteTag(tag); } return TRUE; } return FALSE; } /** Read JFIF "JFXX" extension APP0 marker @param dib Input FIBITMAP @param dataptr Pointer to the APP0 marker @param datalen APP0 marker length @return Returns TRUE if successful, FALSE otherwise */ static BOOL jpeg_read_jfxx(FIBITMAP *dib, const BYTE *dataptr, unsigned int datalen) { if(datalen < 6) { return FALSE; } const int id_length = 5; const BYTE *data = dataptr + id_length; unsigned remaining = datalen - id_length; const BYTE type = *data; ++data, --remaining; switch(type) { case JFXX_TYPE_JPEG: { // load the thumbnail FIMEMORY* hmem = FreeImage_OpenMemory(const_cast(data), remaining); FIBITMAP* thumbnail = FreeImage_LoadFromMemory(FIF_JPEG, hmem); FreeImage_CloseMemory(hmem); // store the thumbnail FreeImage_SetThumbnail(dib, thumbnail); // then delete it FreeImage_Unload(thumbnail); break; } case JFXX_TYPE_8bit: // colormapped uncompressed thumbnail (no supported) break; case JFXX_TYPE_24bit: // truecolor uncompressed thumbnail (no supported) break; default: break; } return TRUE; } /** Read JPEG special markers */ static BOOL read_markers(j_decompress_ptr cinfo, FIBITMAP *dib) { jpeg_saved_marker_ptr marker; for(marker = cinfo->marker_list; marker != NULL; marker = marker->next) { switch(marker->marker) { case JPEG_APP0: // JFIF is handled by libjpeg already, handle JFXX if(memcmp(marker->data, "JFIF" , 5) == 0) { continue; } if(memcmp(marker->data, "JFXX" , 5) == 0) { if(!cinfo->saw_JFIF_marker || cinfo->JFIF_minor_version < 2) { FreeImage_OutputMessageProc(s_format_id, "Warning: non-standard JFXX segment"); } jpeg_read_jfxx(dib, marker->data, marker->data_length); } // other values such as 'Picasa' : ignore safely unknown APP0 marker break; case JPEG_COM: // JPEG comment jpeg_read_comment(dib, marker->data, marker->data_length); break; case EXIF_MARKER: // Exif or Adobe XMP profile jpeg_read_exif_profile(dib, marker->data, marker->data_length); jpeg_read_xmp_profile(dib, marker->data, marker->data_length); jpeg_read_exif_profile_raw(dib, marker->data, marker->data_length); break; case IPTC_MARKER: // IPTC/NAA or Adobe Photoshop profile jpeg_read_iptc_profile(dib, marker->data, marker->data_length); break; } } // ICC profile BYTE *icc_profile = NULL; unsigned icc_length = 0; if( jpeg_read_icc_profile(cinfo, &icc_profile, &icc_length) ) { // copy ICC profile data FreeImage_CreateICCProfile(dib, icc_profile, icc_length); // clean up free(icc_profile); } return TRUE; } // ---------------------------------------------------------- // Special markers write functions // ---------------------------------------------------------- /** Write JPEG_COM marker (comment) */ static BOOL jpeg_write_comment(j_compress_ptr cinfo, FIBITMAP *dib) { FITAG *tag = NULL; // write user comment as a JPEG_COM marker FreeImage_GetMetadata(FIMD_COMMENTS, dib, "Comment", &tag); if(tag) { const char *tag_value = (char*)FreeImage_GetTagValue(tag); if(NULL != tag_value) { for(long i = 0; i < (long)strlen(tag_value); i+= MAX_BYTES_IN_MARKER) { jpeg_write_marker(cinfo, JPEG_COM, (BYTE*)tag_value + i, MIN((long)strlen(tag_value + i), MAX_BYTES_IN_MARKER)); } return TRUE; } } return FALSE; } /** Write JPEG_APP2 marker (ICC profile) */ static BOOL jpeg_write_icc_profile(j_compress_ptr cinfo, FIBITMAP *dib) { // marker identifying string "ICC_PROFILE" (null-terminated) BYTE icc_signature[12] = { 0x49, 0x43, 0x43, 0x5F, 0x50, 0x52, 0x4F, 0x46, 0x49, 0x4C, 0x45, 0x00 }; FIICCPROFILE *iccProfile = FreeImage_GetICCProfile(dib); if (iccProfile->size && iccProfile->data) { // ICC_HEADER_SIZE: ICC signature is 'ICC_PROFILE' + 2 bytes BYTE *profile = (BYTE*)malloc((iccProfile->size + ICC_HEADER_SIZE) * sizeof(BYTE)); if(profile == NULL) return FALSE; memcpy(profile, icc_signature, 12); for(long i = 0; i < (long)iccProfile->size; i += MAX_DATA_BYTES_IN_MARKER) { unsigned length = MIN((long)(iccProfile->size - i), MAX_DATA_BYTES_IN_MARKER); // sequence number profile[12] = (BYTE) ((i / MAX_DATA_BYTES_IN_MARKER) + 1); // number of markers profile[13] = (BYTE) (iccProfile->size / MAX_DATA_BYTES_IN_MARKER + 1); memcpy(profile + ICC_HEADER_SIZE, (BYTE*)iccProfile->data + i, length); jpeg_write_marker(cinfo, ICC_MARKER, profile, (length + ICC_HEADER_SIZE)); } free(profile); return TRUE; } return FALSE; } /** Write JPEG_APPD marker (IPTC or Adobe Photoshop profile) @return Returns TRUE if successful, FALSE otherwise */ static BOOL jpeg_write_iptc_profile(j_compress_ptr cinfo, FIBITMAP *dib) { //const char *ps_header = "Photoshop 3.0\x08BIM\x04\x04\x0\x0\x0\x0"; const unsigned tag_length = 26; if(FreeImage_GetMetadataCount(FIMD_IPTC, dib)) { BYTE *profile = NULL; unsigned profile_size = 0; // create a binary profile if(write_iptc_profile(dib, &profile, &profile_size)) { // write the profile for(long i = 0; i < (long)profile_size; i += 65517L) { unsigned length = MIN((long)profile_size - i, 65517L); unsigned roundup = length & 0x01; // needed for Photoshop BYTE *iptc_profile = (BYTE*)malloc(length + roundup + tag_length); if(iptc_profile == NULL) break; // Photoshop identification string memcpy(&iptc_profile[0], "Photoshop 3.0\x0", 14); // 8BIM segment type memcpy(&iptc_profile[14], "8BIM\x04\x04\x0\x0\x0\x0", 10); // segment size iptc_profile[24] = (BYTE)(length >> 8); iptc_profile[25] = (BYTE)(length & 0xFF); // segment data memcpy(&iptc_profile[tag_length], &profile[i], length); if(roundup) iptc_profile[length + tag_length] = 0; jpeg_write_marker(cinfo, IPTC_MARKER, iptc_profile, length + roundup + tag_length); free(iptc_profile); } // release profile free(profile); return TRUE; } } return FALSE; } /** Write JPEG_APP1 marker (XMP profile) @return Returns TRUE if successful, FALSE otherwise */ static BOOL jpeg_write_xmp_profile(j_compress_ptr cinfo, FIBITMAP *dib) { // marker identifying string for XMP (null terminated) const char *xmp_signature = "http://ns.adobe.com/xap/1.0/"; FITAG *tag_xmp = NULL; FreeImage_GetMetadata(FIMD_XMP, dib, g_TagLib_XMPFieldName, &tag_xmp); if(tag_xmp) { const BYTE *tag_value = (BYTE*)FreeImage_GetTagValue(tag_xmp); if(NULL != tag_value) { // XMP signature is 29 bytes long unsigned int xmp_header_size = (unsigned int)strlen(xmp_signature) + 1; DWORD tag_length = FreeImage_GetTagLength(tag_xmp); BYTE *profile = (BYTE*)malloc((tag_length + xmp_header_size) * sizeof(BYTE)); if(profile == NULL) return FALSE; memcpy(profile, xmp_signature, xmp_header_size); for(DWORD i = 0; i < tag_length; i += 65504L) { unsigned length = MIN((long)(tag_length - i), 65504L); memcpy(profile + xmp_header_size, tag_value + i, length); jpeg_write_marker(cinfo, EXIF_MARKER, profile, (length + xmp_header_size)); } free(profile); return TRUE; } } return FALSE; } /** Write JPEG_APP1 marker (Exif profile) @return Returns TRUE if successful, FALSE otherwise */ static BOOL jpeg_write_exif_profile_raw(j_compress_ptr cinfo, FIBITMAP *dib) { // marker identifying string for Exif = "Exif\0\0" BYTE exif_signature[6] = { 0x45, 0x78, 0x69, 0x66, 0x00, 0x00 }; FITAG *tag_exif = NULL; FreeImage_GetMetadata(FIMD_EXIF_RAW, dib, g_TagLib_ExifRawFieldName, &tag_exif); if(tag_exif) { const BYTE *tag_value = (BYTE*)FreeImage_GetTagValue(tag_exif); // verify the identifying string if(memcmp(exif_signature, tag_value, sizeof(exif_signature)) != 0) { // not an Exif profile return FALSE; } if(NULL != tag_value) { DWORD tag_length = FreeImage_GetTagLength(tag_exif); BYTE *profile = (BYTE*)malloc(tag_length * sizeof(BYTE)); if(profile == NULL) return FALSE; for(DWORD i = 0; i < tag_length; i += 65504L) { unsigned length = MIN((long)(tag_length - i), 65504L); memcpy(profile, tag_value + i, length); jpeg_write_marker(cinfo, EXIF_MARKER, profile, length); } free(profile); return TRUE; } } return FALSE; } /** Write thumbnail (JFXX segment, JPEG compressed) */ static BOOL jpeg_write_jfxx(j_compress_ptr cinfo, FIBITMAP *dib) { // get the thumbnail to be stored FIBITMAP* thumbnail = FreeImage_GetThumbnail(dib); if(!thumbnail) { return TRUE; } // check for a compatible output format if((FreeImage_GetImageType(thumbnail) != FIT_BITMAP) || (FreeImage_GetBPP(thumbnail) != 8) && (FreeImage_GetBPP(thumbnail) != 24)) { FreeImage_OutputMessageProc(s_format_id, FI_MSG_WARNING_INVALID_THUMBNAIL); return FALSE; } // stores the thumbnail as a baseline JPEG into a memory block // return the memory block only if its size is within JFXX marker size limit! FIMEMORY *stream = FreeImage_OpenMemory(); if(FreeImage_SaveToMemory(FIF_JPEG, thumbnail, stream, JPEG_BASELINE)) { // check that the memory block size is within JFXX marker size limit FreeImage_SeekMemory(stream, 0, SEEK_END); const long eof = FreeImage_TellMemory(stream); if(eof > MAX_JFXX_THUMB_SIZE) { FreeImage_OutputMessageProc(s_format_id, "Warning: attached thumbnail is %d bytes larger than maximum supported size - Thumbnail saving aborted", eof - MAX_JFXX_THUMB_SIZE); FreeImage_CloseMemory(stream); return FALSE; } } else { FreeImage_CloseMemory(stream); return FALSE; } BYTE* thData = NULL; DWORD thSize = 0; FreeImage_AcquireMemory(stream, &thData, &thSize); BYTE id_length = 5; //< "JFXX" BYTE type = JFXX_TYPE_JPEG; DWORD totalsize = id_length + sizeof(type) + thSize; jpeg_write_m_header(cinfo, JPEG_APP0, totalsize); jpeg_write_m_byte(cinfo, 'J'); jpeg_write_m_byte(cinfo, 'F'); jpeg_write_m_byte(cinfo, 'X'); jpeg_write_m_byte(cinfo, 'X'); jpeg_write_m_byte(cinfo, '\0'); jpeg_write_m_byte(cinfo, type); // write thumbnail to destination. // We "cram it straight into the data destination module", because write_m_byte is slow freeimage_dst_ptr dest = (freeimage_dst_ptr) cinfo->dest; BYTE* & out = dest->pub.next_output_byte; size_t & bufRemain = dest->pub.free_in_buffer; const BYTE *thData_end = thData + thSize; while(thData < thData_end) { *(out)++ = *(thData)++; if (--bufRemain == 0) { // buffer full - flush if (!dest->pub.empty_output_buffer(cinfo)) { break; } } } FreeImage_CloseMemory(stream); return TRUE; } /** Write JPEG special markers */ static BOOL write_markers(j_compress_ptr cinfo, FIBITMAP *dib) { // write thumbnail as a JFXX marker jpeg_write_jfxx(cinfo, dib); // write user comment as a JPEG_COM marker jpeg_write_comment(cinfo, dib); // write ICC profile jpeg_write_icc_profile(cinfo, dib); // write IPTC profile jpeg_write_iptc_profile(cinfo, dib); // write Adobe XMP profile jpeg_write_xmp_profile(cinfo, dib); // write Exif raw data jpeg_write_exif_profile_raw(cinfo, dib); return TRUE; } // ------------------------------------------------------------ // Keep original size info when using scale option on loading // ------------------------------------------------------------ static void store_size_info(FIBITMAP *dib, JDIMENSION width, JDIMENSION height) { char buffer[256]; // create a tag FITAG *tag = FreeImage_CreateTag(); if(tag) { size_t length = 0; // set the original width sprintf(buffer, "%d", (int)width); length = strlen(buffer) + 1; // include the NULL/0 value FreeImage_SetTagKey(tag, "OriginalJPEGWidth"); FreeImage_SetTagLength(tag, (DWORD)length); FreeImage_SetTagCount(tag, (DWORD)length); FreeImage_SetTagType(tag, FIDT_ASCII); FreeImage_SetTagValue(tag, buffer); FreeImage_SetMetadata(FIMD_COMMENTS, dib, FreeImage_GetTagKey(tag), tag); // set the original height sprintf(buffer, "%d", (int)height); length = strlen(buffer) + 1; // include the NULL/0 value FreeImage_SetTagKey(tag, "OriginalJPEGHeight"); FreeImage_SetTagLength(tag, (DWORD)length); FreeImage_SetTagCount(tag, (DWORD)length); FreeImage_SetTagType(tag, FIDT_ASCII); FreeImage_SetTagValue(tag, buffer); FreeImage_SetMetadata(FIMD_COMMENTS, dib, FreeImage_GetTagKey(tag), tag); // destroy the tag FreeImage_DeleteTag(tag); } } // ========================================================== // Plugin Implementation // ========================================================== static const char * DLL_CALLCONV Format() { return "JPEG"; } static const char * DLL_CALLCONV Description() { return "JPEG - JFIF Compliant"; } static const char * DLL_CALLCONV Extension() { return "jpg,jif,jpeg,jpe"; } static const char * DLL_CALLCONV RegExpr() { return "^\377\330\377"; } static const char * DLL_CALLCONV MimeType() { return "image/jpeg"; } static BOOL DLL_CALLCONV Validate(FreeImageIO *io, fi_handle handle) { BYTE jpeg_signature[] = { 0xFF, 0xD8 }; BYTE signature[2] = { 0, 0 }; io->read_proc(signature, 1, sizeof(jpeg_signature), handle); return (memcmp(jpeg_signature, signature, sizeof(jpeg_signature)) == 0); } static BOOL DLL_CALLCONV SupportsExportDepth(int depth) { return ( (depth == 8) || (depth == 24) ); } static BOOL DLL_CALLCONV SupportsExportType(FREE_IMAGE_TYPE type) { return (type == FIT_BITMAP) ? TRUE : FALSE; } static BOOL DLL_CALLCONV SupportsICCProfiles() { return TRUE; } static BOOL DLL_CALLCONV SupportsNoPixels() { return TRUE; } // ---------------------------------------------------------- static FIBITMAP * DLL_CALLCONV Load(FreeImageIO *io, fi_handle handle, int page, int flags, void *data) { if (handle) { FIBITMAP *dib = NULL; BOOL header_only = (flags & FIF_LOAD_NOPIXELS) == FIF_LOAD_NOPIXELS; // set up the jpeglib structures struct jpeg_decompress_struct cinfo; ErrorManager fi_error_mgr; try { // step 1: allocate and initialize JPEG decompression object // we set up the normal JPEG error routines, then override error_exit & output_message cinfo.err = jpeg_std_error(&fi_error_mgr.pub); fi_error_mgr.pub.error_exit = jpeg_error_exit; fi_error_mgr.pub.output_message = jpeg_output_message; // establish the setjmp return context for jpeg_error_exit to use if (setjmp(fi_error_mgr.setjmp_buffer)) { // If we get here, the JPEG code has signaled an error. // We need to clean up the JPEG object, close the input file, and return. jpeg_destroy_decompress(&cinfo); throw (const char*)NULL; } jpeg_create_decompress(&cinfo); // step 2a: specify data source (eg, a handle) jpeg_freeimage_src(&cinfo, handle, io); // step 2b: save special markers for later reading jpeg_save_markers(&cinfo, JPEG_COM, 0xFFFF); for(int m = 0; m < 16; m++) { jpeg_save_markers(&cinfo, JPEG_APP0 + m, 0xFFFF); } // step 3: read handle parameters with jpeg_read_header() jpeg_read_header(&cinfo, TRUE); // step 4: set parameters for decompression unsigned int scale_denom = 1; // fraction by which to scale image int requested_size = flags >> 16; // requested user size in pixels if(requested_size > 0) { // the JPEG codec can perform x2, x4 or x8 scaling on loading // try to find the more appropriate scaling according to user's need double scale = MAX((double)cinfo.image_width, (double)cinfo.image_height) / (double)requested_size; if(scale >= 8) { scale_denom = 8; } else if(scale >= 4) { scale_denom = 4; } else if(scale >= 2) { scale_denom = 2; } } cinfo.scale_num = 1; cinfo.scale_denom = scale_denom; if ((flags & JPEG_ACCURATE) != JPEG_ACCURATE) { cinfo.dct_method = JDCT_IFAST; cinfo.do_fancy_upsampling = FALSE; } if ((flags & JPEG_GREYSCALE) == JPEG_GREYSCALE) { // force loading as a 8-bit greyscale image cinfo.out_color_space = JCS_GRAYSCALE; } // step 5a: start decompressor and calculate output width and height jpeg_start_decompress(&cinfo); // step 5b: allocate dib and init header if((cinfo.output_components == 4) && (cinfo.out_color_space == JCS_CMYK)) { // CMYK image if((flags & JPEG_CMYK) == JPEG_CMYK) { // load as CMYK dib = FreeImage_AllocateHeader(header_only, cinfo.output_width, cinfo.output_height, 32, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK); if(!dib) throw FI_MSG_ERROR_DIB_MEMORY; FreeImage_GetICCProfile(dib)->flags |= FIICC_COLOR_IS_CMYK; } else { // load as CMYK and convert to RGB dib = FreeImage_AllocateHeader(header_only, cinfo.output_width, cinfo.output_height, 24, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK); if(!dib) throw FI_MSG_ERROR_DIB_MEMORY; } } else { // RGB or greyscale image dib = FreeImage_AllocateHeader(header_only, cinfo.output_width, cinfo.output_height, 8 * cinfo.output_components, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK); if(!dib) throw FI_MSG_ERROR_DIB_MEMORY; if (cinfo.output_components == 1) { // build a greyscale palette RGBQUAD *colors = FreeImage_GetPalette(dib); for (int i = 0; i < 256; i++) { colors[i].rgbRed = (BYTE)i; colors[i].rgbGreen = (BYTE)i; colors[i].rgbBlue = (BYTE)i; } } } if(scale_denom != 1) { // store original size info if a scaling was requested store_size_info(dib, cinfo.image_width, cinfo.image_height); } // step 5c: handle metrices if (cinfo.density_unit == 1) { // dots/inch FreeImage_SetDotsPerMeterX(dib, (unsigned) (((float)cinfo.X_density) / 0.0254000 + 0.5)); FreeImage_SetDotsPerMeterY(dib, (unsigned) (((float)cinfo.Y_density) / 0.0254000 + 0.5)); } else if (cinfo.density_unit == 2) { // dots/cm FreeImage_SetDotsPerMeterX(dib, (unsigned) (cinfo.X_density * 100)); FreeImage_SetDotsPerMeterY(dib, (unsigned) (cinfo.Y_density * 100)); } // step 6: read special markers read_markers(&cinfo, dib); // --- header only mode => clean-up and return if (header_only) { // release JPEG decompression object jpeg_destroy_decompress(&cinfo); // return header data return dib; } // step 7a: while (scan lines remain to be read) jpeg_read_scanlines(...); if((cinfo.out_color_space == JCS_CMYK) && ((flags & JPEG_CMYK) != JPEG_CMYK)) { // convert from CMYK to RGB JSAMPARRAY buffer; // output row buffer unsigned row_stride; // physical row width in output buffer // JSAMPLEs per row in output buffer row_stride = cinfo.output_width * cinfo.output_components; // make a one-row-high sample array that will go away when done with image buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1); while (cinfo.output_scanline < cinfo.output_height) { JSAMPROW src = buffer[0]; JSAMPROW dst = FreeImage_GetScanLine(dib, cinfo.output_height - cinfo.output_scanline - 1); jpeg_read_scanlines(&cinfo, buffer, 1); for(unsigned x = 0; x < cinfo.output_width; x++) { WORD K = (WORD)src[3]; dst[FI_RGBA_RED] = (BYTE)((K * src[0]) / 255); // C -> R dst[FI_RGBA_GREEN] = (BYTE)((K * src[1]) / 255); // M -> G dst[FI_RGBA_BLUE] = (BYTE)((K * src[2]) / 255); // Y -> B src += 4; dst += 3; } } } else if((cinfo.out_color_space == JCS_CMYK) && ((flags & JPEG_CMYK) == JPEG_CMYK)) { // convert from LibJPEG CMYK to standard CMYK JSAMPARRAY buffer; // output row buffer unsigned row_stride; // physical row width in output buffer // JSAMPLEs per row in output buffer row_stride = cinfo.output_width * cinfo.output_components; // make a one-row-high sample array that will go away when done with image buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1); while (cinfo.output_scanline < cinfo.output_height) { JSAMPROW src = buffer[0]; JSAMPROW dst = FreeImage_GetScanLine(dib, cinfo.output_height - cinfo.output_scanline - 1); jpeg_read_scanlines(&cinfo, buffer, 1); for(unsigned x = 0; x < cinfo.output_width; x++) { // CMYK pixels are inverted dst[0] = ~src[0]; // C dst[1] = ~src[1]; // M dst[2] = ~src[2]; // Y dst[3] = ~src[3]; // K src += 4; dst += 4; } } } else { // normal case (RGB or greyscale image) while (cinfo.output_scanline < cinfo.output_height) { JSAMPROW dst = FreeImage_GetScanLine(dib, cinfo.output_height - cinfo.output_scanline - 1); jpeg_read_scanlines(&cinfo, &dst, 1); } // step 7b: swap red and blue components (see LibJPEG/jmorecfg.h: #define RGB_RED, ...) // The default behavior of the JPEG library is kept "as is" because LibTIFF uses // LibJPEG "as is". #if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR SwapRedBlue32(dib); #endif } // step 8: finish decompression jpeg_finish_decompress(&cinfo); // step 9: release JPEG decompression object jpeg_destroy_decompress(&cinfo); // check for automatic Exif rotation if(!header_only && ((flags & JPEG_EXIFROTATE) == JPEG_EXIFROTATE)) { RotateExif(&dib); } // everything went well. return the loaded dib return dib; } catch (const char *text) { jpeg_destroy_decompress(&cinfo); if(NULL != dib) { FreeImage_Unload(dib); } if(NULL != text) { FreeImage_OutputMessageProc(s_format_id, text); } } } return NULL; } // ---------------------------------------------------------- static BOOL DLL_CALLCONV Save(FreeImageIO *io, FIBITMAP *dib, fi_handle handle, int page, int flags, void *data) { if ((dib) && (handle)) { try { // Check dib format const char *sError = "only 24-bit highcolor or 8-bit greyscale/palette bitmaps can be saved as JPEG"; FREE_IMAGE_COLOR_TYPE color_type = FreeImage_GetColorType(dib); WORD bpp = (WORD)FreeImage_GetBPP(dib); if ((bpp != 24) && (bpp != 8)) { throw sError; } if(bpp == 8) { // allow grey, reverse grey and palette if ((color_type != FIC_MINISBLACK) && (color_type != FIC_MINISWHITE) && (color_type != FIC_PALETTE)) { throw sError; } } struct jpeg_compress_struct cinfo; ErrorManager fi_error_mgr; // Step 1: allocate and initialize JPEG compression object // we set up the normal JPEG error routines, then override error_exit & output_message cinfo.err = jpeg_std_error(&fi_error_mgr.pub); fi_error_mgr.pub.error_exit = jpeg_error_exit; fi_error_mgr.pub.output_message = jpeg_output_message; // establish the setjmp return context for jpeg_error_exit to use if (setjmp(fi_error_mgr.setjmp_buffer)) { // If we get here, the JPEG code has signaled an error. // We need to clean up the JPEG object, close the input file, and return. jpeg_destroy_compress(&cinfo); throw (const char*)NULL; } // Now we can initialize the JPEG compression object jpeg_create_compress(&cinfo); // Step 2: specify data destination (eg, a file) jpeg_freeimage_dst(&cinfo, handle, io); // Step 3: set parameters for compression cinfo.image_width = FreeImage_GetWidth(dib); cinfo.image_height = FreeImage_GetHeight(dib); switch(color_type) { case FIC_MINISBLACK : case FIC_MINISWHITE : cinfo.in_color_space = JCS_GRAYSCALE; cinfo.input_components = 1; break; default : cinfo.in_color_space = JCS_RGB; cinfo.input_components = 3; break; } jpeg_set_defaults(&cinfo); // progressive-JPEG support if((flags & JPEG_PROGRESSIVE) == JPEG_PROGRESSIVE) { jpeg_simple_progression(&cinfo); } // compute optimal Huffman coding tables for the image if((flags & JPEG_OPTIMIZE) == JPEG_OPTIMIZE) { cinfo.optimize_coding = TRUE; } // Set JFIF density parameters from the DIB data cinfo.X_density = (UINT16) (0.5 + 0.0254 * FreeImage_GetDotsPerMeterX(dib)); cinfo.Y_density = (UINT16) (0.5 + 0.0254 * FreeImage_GetDotsPerMeterY(dib)); cinfo.density_unit = 1; // dots / inch // thumbnail support (JFIF 1.02 extension markers) if(FreeImage_GetThumbnail(dib) != NULL) { cinfo.write_JFIF_header = 1; //<### force it, though when color is CMYK it will be incorrect cinfo.JFIF_minor_version = 2; } // baseline JPEG support if ((flags & JPEG_BASELINE) == JPEG_BASELINE) { cinfo.write_JFIF_header = 0; // No marker for non-JFIF colorspaces cinfo.write_Adobe_marker = 0; // write no Adobe marker by default } // set subsampling options if required if(cinfo.in_color_space == JCS_RGB) { if((flags & JPEG_SUBSAMPLING_411) == JPEG_SUBSAMPLING_411) { // 4:1:1 (4x1 1x1 1x1) - CrH 25% - CbH 25% - CrV 100% - CbV 100% // the horizontal color resolution is quartered cinfo.comp_info[0].h_samp_factor = 4; // Y cinfo.comp_info[0].v_samp_factor = 1; cinfo.comp_info[1].h_samp_factor = 1; // Cb cinfo.comp_info[1].v_samp_factor = 1; cinfo.comp_info[2].h_samp_factor = 1; // Cr cinfo.comp_info[2].v_samp_factor = 1; } else if((flags & JPEG_SUBSAMPLING_420) == JPEG_SUBSAMPLING_420) { // 4:2:0 (2x2 1x1 1x1) - CrH 50% - CbH 50% - CrV 50% - CbV 50% // the chrominance resolution in both the horizontal and vertical directions is cut in half cinfo.comp_info[0].h_samp_factor = 2; // Y cinfo.comp_info[0].v_samp_factor = 2; cinfo.comp_info[1].h_samp_factor = 1; // Cb cinfo.comp_info[1].v_samp_factor = 1; cinfo.comp_info[2].h_samp_factor = 1; // Cr cinfo.comp_info[2].v_samp_factor = 1; } else if((flags & JPEG_SUBSAMPLING_422) == JPEG_SUBSAMPLING_422){ //2x1 (low) // 4:2:2 (2x1 1x1 1x1) - CrH 50% - CbH 50% - CrV 100% - CbV 100% // half of the horizontal resolution in the chrominance is dropped (Cb & Cr), // while the full resolution is retained in the vertical direction, with respect to the luminance cinfo.comp_info[0].h_samp_factor = 2; // Y cinfo.comp_info[0].v_samp_factor = 1; cinfo.comp_info[1].h_samp_factor = 1; // Cb cinfo.comp_info[1].v_samp_factor = 1; cinfo.comp_info[2].h_samp_factor = 1; // Cr cinfo.comp_info[2].v_samp_factor = 1; } else if((flags & JPEG_SUBSAMPLING_444) == JPEG_SUBSAMPLING_444){ //1x1 (no subsampling) // 4:4:4 (1x1 1x1 1x1) - CrH 100% - CbH 100% - CrV 100% - CbV 100% // the resolution of chrominance information (Cb & Cr) is preserved // at the same rate as the luminance (Y) information cinfo.comp_info[0].h_samp_factor = 1; // Y cinfo.comp_info[0].v_samp_factor = 1; cinfo.comp_info[1].h_samp_factor = 1; // Cb cinfo.comp_info[1].v_samp_factor = 1; cinfo.comp_info[2].h_samp_factor = 1; // Cr cinfo.comp_info[2].v_samp_factor = 1; } } // Step 4: set quality // the first 7 bits are reserved for low level quality settings // the other bits are high level (i.e. enum-ish) int quality; if ((flags & JPEG_QUALITYBAD) == JPEG_QUALITYBAD) { quality = 10; } else if ((flags & JPEG_QUALITYAVERAGE) == JPEG_QUALITYAVERAGE) { quality = 25; } else if ((flags & JPEG_QUALITYNORMAL) == JPEG_QUALITYNORMAL) { quality = 50; } else if ((flags & JPEG_QUALITYGOOD) == JPEG_QUALITYGOOD) { quality = 75; } else if ((flags & JPEG_QUALITYSUPERB) == JPEG_QUALITYSUPERB) { quality = 100; } else { if ((flags & 0x7F) == 0) { quality = 75; } else { quality = flags & 0x7F; } } jpeg_set_quality(&cinfo, quality, TRUE); /* limit to baseline-JPEG values */ // Step 5: Start compressor jpeg_start_compress(&cinfo, TRUE); // Step 6: Write special markers if ((flags & JPEG_BASELINE) != JPEG_BASELINE) { write_markers(&cinfo, dib); } // Step 7: while (scan lines remain to be written) if(color_type == FIC_RGB) { // 24-bit RGB image : need to swap red and blue channels unsigned pitch = FreeImage_GetPitch(dib); BYTE *target = (BYTE*)malloc(pitch * sizeof(BYTE)); if (target == NULL) { throw FI_MSG_ERROR_MEMORY; } while (cinfo.next_scanline < cinfo.image_height) { // get a copy of the scanline memcpy(target, FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - cinfo.next_scanline - 1), pitch); #if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR // swap R and B channels BYTE *target_p = target; for(unsigned x = 0; x < cinfo.image_width; x++) { INPLACESWAP(target_p[0], target_p[2]); target_p += 3; } #endif // write the scanline jpeg_write_scanlines(&cinfo, &target, 1); } free(target); } else if(color_type == FIC_MINISBLACK) { // 8-bit standard greyscale images while (cinfo.next_scanline < cinfo.image_height) { JSAMPROW b = FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - cinfo.next_scanline - 1); jpeg_write_scanlines(&cinfo, &b, 1); } } else if(color_type == FIC_PALETTE) { // 8-bit palettized images are converted to 24-bit images RGBQUAD *palette = FreeImage_GetPalette(dib); BYTE *target = (BYTE*)malloc(cinfo.image_width * 3); if (target == NULL) { throw FI_MSG_ERROR_MEMORY; } while (cinfo.next_scanline < cinfo.image_height) { BYTE *source = FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - cinfo.next_scanline - 1); FreeImage_ConvertLine8To24(target, source, cinfo.image_width, palette); #if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR // swap R and B channels BYTE *target_p = target; for(unsigned x = 0; x < cinfo.image_width; x++) { INPLACESWAP(target_p[0], target_p[2]); target_p += 3; } #endif jpeg_write_scanlines(&cinfo, &target, 1); } free(target); } else if(color_type == FIC_MINISWHITE) { // reverse 8-bit greyscale image, so reverse grey value on the fly unsigned i; BYTE reverse[256]; BYTE *target = (BYTE *)malloc(cinfo.image_width); if (target == NULL) { throw FI_MSG_ERROR_MEMORY; } for(i = 0; i < 256; i++) { reverse[i] = (BYTE)(255 - i); } while(cinfo.next_scanline < cinfo.image_height) { BYTE *source = FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - cinfo.next_scanline - 1); for(i = 0; i < cinfo.image_width; i++) { target[i] = reverse[ source[i] ]; } jpeg_write_scanlines(&cinfo, &target, 1); } free(target); } // Step 8: Finish compression jpeg_finish_compress(&cinfo); // Step 9: release JPEG compression object jpeg_destroy_compress(&cinfo); return TRUE; } catch (const char *text) { if(text) { FreeImage_OutputMessageProc(s_format_id, text); } return FALSE; } } return FALSE; } // ========================================================== // Init // ========================================================== void DLL_CALLCONV InitJPEG(Plugin *plugin, int format_id) { s_format_id = format_id; plugin->format_proc = Format; plugin->description_proc = Description; plugin->extension_proc = Extension; plugin->regexpr_proc = RegExpr; plugin->open_proc = NULL; plugin->close_proc = NULL; plugin->pagecount_proc = NULL; plugin->pagecapability_proc = NULL; plugin->load_proc = Load; plugin->save_proc = Save; plugin->validate_proc = Validate; plugin->mime_proc = MimeType; plugin->supports_export_bpp_proc = SupportsExportDepth; plugin->supports_export_type_proc = SupportsExportType; plugin->supports_icc_profiles_proc = SupportsICCProfiles; plugin->supports_no_pixels_proc = SupportsNoPixels; }