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377 lines
13 KiB
C
377 lines
13 KiB
C
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/*
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#
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# File : jpeg_buffer.h
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# ( C++ header file - CImg plug-in )
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#
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# Description : This CImg plug-in provide functions to load and save jpeg images
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# directly from/to memory buffers of JOCTET buffers, using the
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# JPEG library (required to compile !)
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# This file is a part of the CImg Library project.
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# ( http://cimg.eu )
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#
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# Copyright : Paolo Prete
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# ( p4olo_prete@yahoo.it )
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#
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# License : CeCILL v2.0
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# ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )
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#
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# This software is governed by the CeCILL license under French law and
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# abiding by the rules of distribution of free software. You can use,
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# modify and/ or redistribute the software under the terms of the CeCILL
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# license as circulated by CEA, CNRS and INRIA at the following URL
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# "http://www.cecill.info".
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#
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# As a counterpart to the access to the source code and rights to copy,
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# modify and redistribute granted by the license, users are provided only
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# with a limited warranty and the software's author, the holder of the
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# economic rights, and the successive licensors have only limited
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# liability.
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#
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# In this respect, the user's attention is drawn to the risks associated
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# with loading, using, modifying and/or developing or reproducing the
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# software by the user in light of its specific status of free software,
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# that may mean that it is complicated to manipulate, and that also
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# therefore means that it is reserved for developers and experienced
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# professionals having in-depth computer knowledge. Users are therefore
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# encouraged to load and test the software's suitability as regards their
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# requirements in conditions enabling the security of their systems and/or
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# data to be ensured and, more generally, to use and operate it in the
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# same conditions as regards security.
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#
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# The fact that you are presently reading this means that you have had
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# knowledge of the CeCILL license and that you accept its terms.
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#
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*/
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/*-----------------------------------------------------------------------------------
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IMPORTANT NOTE :
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You *need* to include the following lines in your own code to use this plugin :
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#include <cstdio>
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#include <jpeglib.h>
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#include <jerror.h>
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(see example file provided in examples/use_jpeg_buffer.cpp).
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------------------------------------------------------------------------------------*/
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#ifndef cimg_plugin_jpeg_buffer
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#define cimg_plugin_jpeg_buffer
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///////////////////////////////////////////////////////////////////////////////////////
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//
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// extension of libjpeg (helper functions for loading images from JOCTET arrays)
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// hacked from
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// http://www.koders.com/cpp/fidB5A4549ABB5CB01824058F57A43D095D3F95AB40.aspx
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//
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///////////////////////////////////////////////////////////////////////////////////////
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#define INPUT_BUF_SIZE 4096
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struct my_source_mem {
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struct jpeg_source_mgr pub; // Public fields
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int indexinmem;
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JOCTET *inmem; // Source stream
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JOCTET *buffer; // Start of buffer
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int lenght; // Size of buffer in memory
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boolean start_of_file; // Have we gotten any data yet?
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};
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struct my_source_mgr {
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struct jpeg_source_mgr pub; // public fields
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FILE *infile; // source stream
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JOCTET *buffer; // start of buffer
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boolean start_of_file; // have we gotten any data yet?
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};
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typedef my_source_mem *my_src_mptr;
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typedef my_source_mgr *my_src_ptr;
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static boolean fill_minput_buffer(j_decompress_ptr cinfo) {
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my_src_mptr src = (my_src_mptr) cinfo->src;
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size_t nbytes;
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if (src->indexinmem + INPUT_BUF_SIZE>src->lenght) nbytes=src->lenght - src->indexinmem;
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else nbytes = INPUT_BUF_SIZE;
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std::memcpy(src->buffer,src->inmem,nbytes);
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src->inmem += nbytes;
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src->indexinmem += (int)nbytes;
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src->pub.next_input_byte = src->buffer;
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src->pub.bytes_in_buffer = INPUT_BUF_SIZE;
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src->start_of_file = FALSE;
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return TRUE;
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}
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static void skip_minput_data(j_decompress_ptr cinfo, long num_bytes) {
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my_src_ptr src = (my_src_ptr)cinfo->src;
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if (num_bytes > 0) {
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while (num_bytes > (long) src->pub.bytes_in_buffer) {
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num_bytes -= (long) src->pub.bytes_in_buffer;
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fill_minput_buffer(cinfo);
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// note we assume that fill_input_buffer will never return FALSE,
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// so suspension need not be handled.
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//
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}
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src->pub.next_input_byte += (size_t) num_bytes;
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src->pub.bytes_in_buffer -= (size_t) num_bytes;
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}
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}
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static void init_msource(j_decompress_ptr cinfo) {
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my_src_mptr src = (my_src_mptr)cinfo->src;
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src->start_of_file = TRUE;
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}
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static void term_source(j_decompress_ptr) {
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// no work necessary here
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}
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static void jpeg_mem_src(j_decompress_ptr cinfo, JOCTET * memptr,int lenght) {
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my_src_mptr src;
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// The source object and input buffer are made permanent so that a series
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//of JPEG images can be read from the same file by calling jpeg_stdio_src
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// only before the first one. (If we discarded the buffer at the end of
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// one image, we'd likely lose the start of the next one.)
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// This makes it unsafe to use this manager and a different source
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// manager serially with the same JPEG object. Caveat programmer.
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//
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// first time for this JPEG object?
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if (cinfo->src == NULL) {
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cinfo->src = (struct jpeg_source_mgr*)(*cinfo->mem->alloc_small)((j_common_ptr) cinfo,
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JPOOL_PERMANENT,sizeof(my_source_mem));
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src = (my_src_mptr) cinfo->src;
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src->buffer = (JOCTET *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo,
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JPOOL_PERMANENT,INPUT_BUF_SIZE * sizeof(JOCTET));
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}
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src = (my_src_mptr) cinfo->src;
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src->pub.init_source = init_msource;
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src->pub.fill_input_buffer = fill_minput_buffer;
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src->pub.skip_input_data = skip_minput_data;
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//src->pub.resync_to_restart = jpeg_resync_to_restart; // use default method
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src->pub.term_source = term_source;
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src->inmem = memptr;
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src->indexinmem = 0;
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src->lenght = lenght;
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src->pub.bytes_in_buffer = 0; // forces fill_input_buffer on first read
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src->pub.next_input_byte = NULL; // until buffer loaded
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}
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// The following declarations and 5 functions are jpeg related
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// functions used by put_jpeg_grey_memory and put_jpeg_yuv420p_memory
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//
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struct mem_destination_mgr {
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struct jpeg_destination_mgr pub;
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JOCTET *buf;
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size_t bufsize;
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size_t jpegsize;
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};
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typedef mem_destination_mgr *mem_dest_ptr;
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static void init_destination(j_compress_ptr cinfo) {
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mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
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dest->pub.next_output_byte = dest->buf;
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dest->pub.free_in_buffer = dest->bufsize;
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dest->jpegsize = 0;
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}
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static boolean empty_output_buffer(j_compress_ptr cinfo) {
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mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
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dest->pub.next_output_byte = dest->buf;
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dest->pub.free_in_buffer = dest->bufsize;
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return FALSE;
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ERREXIT(cinfo, JERR_BUFFER_SIZE);
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}
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static void term_destination(j_compress_ptr cinfo) {
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mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
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dest->jpegsize = dest->bufsize - dest->pub.free_in_buffer;
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}
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static void jpeg_mem_dest(j_compress_ptr cinfo, JOCTET* buf, size_t bufsize) {
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mem_dest_ptr dest;
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if (cinfo->dest == NULL) {
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cinfo->dest = (struct jpeg_destination_mgr *)
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(*cinfo->mem->alloc_small)((j_common_ptr)cinfo,JPOOL_PERMANENT,sizeof(mem_destination_mgr));
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}
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dest = (mem_dest_ptr) cinfo->dest;
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dest->pub.init_destination = init_destination;
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dest->pub.empty_output_buffer = empty_output_buffer;
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dest->pub.term_destination = term_destination;
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dest->buf = buf;
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dest->bufsize = bufsize;
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dest->jpegsize = 0;
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}
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static unsigned jpeg_mem_size(j_compress_ptr cinfo) {
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mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
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return dest->jpegsize;
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}
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/////////////////////////////////////////////////////////////////
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//
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// Define main CImg plugin functions.
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// (you should use these functions only in your own code)
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//
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/////////////////////////////////////////////////////////////////
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//! Load image from a jpeg-coded memory buffer.
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/**
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\param buffer Memory buffer containing the jpeg-coded image data.
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\param buffer_size Size of the memory buffer, in bytes.
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**/
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static CImg get_load_jpeg_buffer(const JOCTET *const buffer, const unsigned buffer_size) {
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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cinfo.err = jpeg_std_error(&jerr);
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jpeg_create_decompress(&cinfo);
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jpeg_mem_src(&cinfo,const_cast<JOCTET*>(buffer),buffer_size);
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jpeg_read_header(&cinfo,TRUE);
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jpeg_start_decompress(&cinfo);
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const unsigned int row_stride = cinfo.output_width * cinfo.output_components;
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JOCTET *buf = new JOCTET[cinfo.output_width*cinfo.output_height*cinfo.output_components];
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const JOCTET *buf2 = buf;
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JSAMPROW row_pointer[1];
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while (cinfo.output_scanline < cinfo.output_height) {
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row_pointer[0] = buf + cinfo.output_scanline*row_stride;
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jpeg_read_scanlines(&cinfo,row_pointer,1);
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}
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jpeg_finish_decompress(&cinfo);
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jpeg_destroy_decompress(&cinfo);
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CImg<T> dest(cinfo.output_width,cinfo.output_height,1,cinfo.output_components);
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switch (dest.spectrum()) {
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case 1: {
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T *ptr_g = dest.data(0,0,0,0);
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cimg_foroff(dest,off) *(ptr_g++) = (T)*(buf2++);
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} break;
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case 3: {
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T
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*ptr_r = dest.data(0,0,0,0),
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*ptr_g = dest.data(0,0,0,1),
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*ptr_b = dest.data(0,0,0,2);
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cimg_forXY(dest,x,y) {
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*(ptr_r++) = (T)*(buf2++);
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*(ptr_g++) = (T)*(buf2++);
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*(ptr_b++) = (T)*(buf2++);
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}
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} break;
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case 4: {
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T
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*ptr_r = dest.data(0,0,0,0),
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*ptr_g = dest.data(0,0,0,1),
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*ptr_b = dest.data(0,0,0,2),
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*ptr_a = dest.data(0,0,0,3);
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cimg_forXY(dest,x,y) {
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*(ptr_r++) = (T)*(buf2++);
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*(ptr_g++) = (T)*(buf2++);
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*(ptr_b++) = (T)*(buf2++);
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*(ptr_a++) = (T)*(buf2++);
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}
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} break;
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}
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delete[] buf;
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return dest;
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}
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//! Load image from a jpeg-coded memory buffer (in-place version)
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/**
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\param buffer Memory buffer containing the jpeg-coded image data.
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\param buffer_size Size of the memory buffer, in bytes.
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**/
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CImg& load_jpeg_buffer(const JOCTET *const buffer, const unsigned buffer_size) {
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return get_load_jpeg_buffer(buffer,buffer_size).move_to(*this);
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}
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//! Save image in a memory buffer, directly as a jpeg-coded file
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/**
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\param buffer Memory buffer that will be written with the jpeg-coded image data.
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\param buffer_size Initial size of the memory buffer. When the function returns, the variable
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contains the effective length needed to fill the buffer.
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\param quality Quality of the jpeg compression.
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**/
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const CImg& save_jpeg_buffer(JOCTET *const buffer, unsigned int &buffer_size, const int quality=100) const {
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// Fill pixel buffer
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JOCTET *buf;
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unsigned int dimbuf=0;
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J_COLOR_SPACE colortype=JCS_RGB;
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switch (spectrum()) {
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case 1: {
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// Greyscale images
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JOCTET *buf2 = buf = new JOCTET[width()*height()*(dimbuf=1)];
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const T
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*ptr_g = data();
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colortype = JCS_GRAYSCALE;
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cimg_foroff(*this,off) *(buf2++) = (JOCTET)*(ptr_g++);
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} break;
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case 2:
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case 3: {
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// RGB images
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JOCTET *buf2 = buf = new JOCTET[width()*height()*(dimbuf=3)];
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const T
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*ptr_r = data(0,0,0,0),
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*ptr_g = data(0,0,0,1),
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*ptr_b = data(0,0,0,spectrum()>2?2:0);
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colortype = JCS_RGB;
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cimg_forXY(*this,x,y) {
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*(buf2++) = (JOCTET)*(ptr_r++);
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*(buf2++) = (JOCTET)*(ptr_g++);
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*(buf2++) = (JOCTET)*(ptr_b++);
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}
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} break;
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default: {
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// YCMYK images
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JOCTET *buf2 = buf = new JOCTET[width()*height()*(dimbuf=4)];
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const T
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*ptr_r = data(0,0,0,0),
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*ptr_g = data(0,0,0,1),
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*ptr_b = data(0,0,0,2),
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*ptr_a = data(0,0,0,3);
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colortype = JCS_CMYK;
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cimg_forXY(*this,x,y) {
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*(buf2++) = (JOCTET)*(ptr_r++);
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*(buf2++) = (JOCTET)*(ptr_g++);
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*(buf2++) = (JOCTET)*(ptr_b++);
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*(buf2++) = (JOCTET)*(ptr_a++);
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}
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} break;
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}
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// Call libjpeg functions
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struct jpeg_compress_struct cinfo;
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struct jpeg_error_mgr jerr;
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cinfo.err = jpeg_std_error(&jerr);
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jpeg_create_compress(&cinfo);
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jpeg_mem_dest(&cinfo, buffer, buffer_size);
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cinfo.image_width = width();
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cinfo.image_height = height();
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cinfo.input_components = dimbuf;
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cinfo.in_color_space = colortype;
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jpeg_set_defaults(&cinfo);
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jpeg_set_quality(&cinfo,quality<100?quality:100,TRUE);
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jpeg_start_compress(&cinfo,TRUE);
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const unsigned int row_stride = width()*dimbuf;
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JSAMPROW row_pointer[1];
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while (cinfo.next_scanline < cinfo.image_height) {
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row_pointer[0] = &buf[cinfo.next_scanline*row_stride];
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jpeg_write_scanlines(&cinfo,row_pointer,1);
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}
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jpeg_finish_compress(&cinfo);
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delete[] buf;
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buffer_size = jpeg_mem_size(&cinfo);
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jpeg_destroy_compress(&cinfo);
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return *this;
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}
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// End of the plug-in
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//-------------------
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#endif /* cimg_plugin_jpeg_buffer */
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