Alien-FreeImage
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src/Source/FreeImage/PluginJPEG.cpp view on Meta::CPAN
// ==========================================================
// 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 <setjmp.h>
#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;
src/Source/FreeImage/PluginJPEG.cpp view on Meta::CPAN
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;
src/Source/FreeImage/PluginJPEG.cpp view on Meta::CPAN
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) {
src/Source/FreeImage/PluginJPEG.cpp view on Meta::CPAN
#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
}
( run in 1.055 second using v1.01-cache-2.11-cpan-5735350b133 )