/**
 *
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 * jpeg.c
 *
 * $Id: jpeg.c,v 1.4 2003/04/27 09:59:36 ton Exp $
 */


/* This little block needed for linking to Blender... */
#include <stdio.h>
#include "BLI_blenlib.h"

#include "imbuf.h"
#include "imbuf_patch.h"
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "IMB_jpeg.h"
#include "jpeglib.h" 

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

/* the types are from the jpeg lib */
static void jpeg_error (j_common_ptr cinfo);
static void init_source(j_decompress_ptr cinfo);
static boolean fill_input_buffer(j_decompress_ptr cinfo);
static void skip_input_data(j_decompress_ptr cinfo, long num_bytes);
static void term_source(j_decompress_ptr cinfo);
static void memory_source(j_decompress_ptr cinfo, unsigned char *buffer, int size);
static boolean handle_app1 (j_decompress_ptr cinfo);
static ImBuf * ibJpegImageFromCinfo(struct jpeg_decompress_struct * cinfo, int flags);


/* strncasecmp hack */
#ifdef WIN32
#define strncasecmp(a, b, n) strncmp(a, b, n)
#endif

/*
 * In principle there are 4 jpeg formats.
 * 
 * 1. jpeg - standard printing, u & v at quarter of resulution
 * 2. jvid - standaard video, u & v half resolution, frame not interlaced

type 3 is unsupported as of jul 05 2000 Frank.

 * 3. jstr - as 2, but written in 2 seperate fields

 * 4. jmax - no scaling in the components
 */

static int jpeg_failed = FALSE;
static int jpeg_default_quality;
static int ibuf_ftype;

static void jpeg_error (j_common_ptr cinfo)
{
	/* Always display the message */
	(*cinfo->err->output_message) (cinfo);

	/* Let the memory manager delete any temp files before we die */
	jpeg_destroy(cinfo);

	jpeg_failed = TRUE;
}

//----------------------------------------------------------
//            INPUT HANDLER FROM MEMORY
//----------------------------------------------------------

typedef struct {
	unsigned char        *buffer;
	int                  filled;
} buffer_struct;

typedef struct {
	struct jpeg_source_mgr pub;   /* public fields */

	unsigned char	*buffer;
	int				size;
	JOCTET			terminal[2];
} my_source_mgr;

typedef my_source_mgr * my_src_ptr;

static void init_source(j_decompress_ptr cinfo)
{
}


static boolean fill_input_buffer(j_decompress_ptr cinfo)
{
	my_src_ptr src = (my_src_ptr) cinfo->src;

	/* Since we have given all we have got already
	* we simply fake an end of file
	*/

	src->pub.next_input_byte = src->terminal;
	src->pub.bytes_in_buffer = 2;
	src->terminal[0] = (JOCTET) 0xFF;
	src->terminal[1] = (JOCTET) JPEG_EOI;

	return TRUE;
}


static void skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
	my_src_ptr src = (my_src_ptr) cinfo->src;

	src->pub.next_input_byte = src->pub.next_input_byte + num_bytes;
}


static void term_source(j_decompress_ptr cinfo)
{
}

static void memory_source(j_decompress_ptr cinfo, unsigned char *buffer, int size)
{
	my_src_ptr src;

	if (cinfo->src == NULL)
	{    /* first time for this JPEG object? */
		cinfo->src = (struct jpeg_source_mgr *)(*cinfo->mem->alloc_small)
                                    	((j_common_ptr) cinfo, JPOOL_PERMANENT,
                                    	 sizeof(my_source_mgr));
	}

	src = (my_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; 
	src->pub.term_source           = term_source;

	src->pub.bytes_in_buffer       = size;
	src->pub.next_input_byte       = buffer;

	src->buffer = buffer;
	src->size = size;
}


#define MAKESTMT(stuff)            do { stuff } while (0)

#define INPUT_VARS(cinfo)  \
	struct jpeg_source_mgr * datasrc = (cinfo)->src;  \
	const JOCTET * next_input_byte = datasrc->next_input_byte;  \
	size_t bytes_in_buffer = datasrc->bytes_in_buffer

/* Unload the local copies --- do this only at a restart boundary */
#define INPUT_SYNC(cinfo)  \
	( datasrc->next_input_byte = next_input_byte,  \
	  datasrc->bytes_in_buffer = bytes_in_buffer )

/* Reload the local copies --- seldom used except in MAKE_BYTE_AVAIL */
#define INPUT_RELOAD(cinfo)  \
	( next_input_byte = datasrc->next_input_byte,  \
	  bytes_in_buffer = datasrc->bytes_in_buffer )

/* Internal macro for INPUT_BYTE and INPUT_2BYTES: make a byte available.
 * Note we do *not* do INPUT_SYNC before calling fill_input_buffer,
 * but we must reload the local copies after a successful fill.
 */
#define MAKE_BYTE_AVAIL(cinfo,action)  \
	if (bytes_in_buffer == 0) {  \
	  if (! (*datasrc->fill_input_buffer) (cinfo))  \
	    { action; }  \
	  INPUT_RELOAD(cinfo);  \
	}  \
	bytes_in_buffer--

/* Read a byte into variable V.
 * If must suspend, take the specified action (typically "return FALSE").
 */
#define INPUT_BYTE(cinfo,V,action)  \
	MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \
		  V = GETJOCTET(*next_input_byte++); )

/* As above, but read two bytes interpreted as an unsigned 16-bit integer.
 * V should be declared unsigned int or perhaps INT32.
 */
#define INPUT_2BYTES(cinfo,V,action)  \
	MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \
		  V = ((unsigned int) GETJOCTET(*next_input_byte++)) << 8; \
		  MAKE_BYTE_AVAIL(cinfo,action); \
		  V += GETJOCTET(*next_input_byte++); )


static boolean
handle_app1 (j_decompress_ptr cinfo)
{
	INT32 length, i;
	char neogeo[128];
	
	INPUT_VARS(cinfo);

	INPUT_2BYTES(cinfo, length, return FALSE);
	length -= 2;
	
	if (length < 16) {
		for (i = 0; i < length; i++) INPUT_BYTE(cinfo, neogeo[i], return FALSE);
		length = 0;
		if (strncmp(neogeo, "NeoGeo", 6) == 0) memcpy(&ibuf_ftype, neogeo + 6, 4);
		ibuf_ftype = BIG_LONG(ibuf_ftype);
	}
	INPUT_SYNC(cinfo);		/* do before skip_input_data */
	if (length > 0) (*cinfo->src->skip_input_data) (cinfo, length);
	return TRUE;
}


static ImBuf * ibJpegImageFromCinfo(struct jpeg_decompress_struct * cinfo, int flags)
{
	JSAMPARRAY row_pointer;
	JSAMPLE * buffer = 0;
	int row_stride;
	int x, y, depth, r, g, b, k;
	struct ImBuf * ibuf = 0;
	uchar * rect;

	/* install own app1 handler */
	ibuf_ftype = 0;
	jpeg_set_marker_processor(cinfo, 0xe1, handle_app1);
	cinfo->dct_method = JDCT_FLOAT;

	if (jpeg_read_header(cinfo, FALSE) == JPEG_HEADER_OK) {
		x = cinfo->image_width;
		y = cinfo->image_height;
		depth = cinfo->num_components;
		
		if (cinfo->jpeg_color_space == JCS_YCCK) cinfo->out_color_space = JCS_CMYK;

		jpeg_start_decompress(cinfo);

		if (ibuf_ftype == 0) {
			ibuf_ftype = JPG_STD;
			if (cinfo->max_v_samp_factor == 1) {
				if (cinfo->max_h_samp_factor == 1) ibuf_ftype = JPG_MAX;
				else ibuf_ftype = JPG_VID;
			}
		}

		if (flags & IB_test) {
			jpeg_abort_decompress(cinfo);
			ibuf = IMB_allocImBuf(x, y, 8 * depth, 0, 0);
		} else {
			ibuf = IMB_allocImBuf(x, y, 8 * depth, IB_rect, 0);

			row_stride = cinfo->output_width * depth;

			row_pointer = (*cinfo->mem->alloc_sarray) ((j_common_ptr) cinfo, JPOOL_IMAGE, row_stride, 1);
			
			for (y = ibuf->y - 1; y >= 0; y--) {
				jpeg_read_scanlines(cinfo, row_pointer, 1);
				if (flags & IB_ttob) {
					rect = (uchar *) (ibuf->rect + (ibuf->y - 1 - y) * ibuf->x);
				} else {
					rect = (uchar *) (ibuf->rect + y * ibuf->x);
				}
				buffer = row_pointer[0];
				
				switch(depth) {
					case 1:
						for (x = ibuf->x; x > 0; x--) {
							rect[3] = 255;
							rect[0] = rect[1] = rect[2] = *buffer++;
							rect += 4;
						}
						break;
					case 3:
						for (x = ibuf->x; x > 0; x--) {
							rect[3] = 255;
							rect[0] = *buffer++;
							rect[1] = *buffer++;
							rect[2] = *buffer++;
							rect += 4;
						}
						break;
					case 4:
						for (x = ibuf->x; x > 0; x--) {
							r = *buffer++;
							g = *buffer++;
							b = *buffer++;
							k = *buffer++;
							
							k = 255 - k;
							r -= k;
							if (r & 0xffffff00) {
								if (r < 0) r = 0;
								else r = 255;
							}
							g -= k;
							if (g & 0xffffff00) {
								if (g < 0) g = 0;
								else g = 255;
							}
							b -= k;
							if (b & 0xffffff00) {
								if (b < 0) b = 0;
								else b = 255;
							}							
							
							rect[3] = 255 - k;
							rect[2] = b;
							rect[1] = g;
							rect[0] = r;
							rect += 4;
						}
				}
			}
			jpeg_finish_decompress(cinfo);
		}
		
		jpeg_destroy((j_common_ptr) cinfo);
		ibuf->ftype = ibuf_ftype;
   	}
	
	return(ibuf);
}	

ImBuf * imb_ibJpegImageFromFilename (char * filename, int flags)
{
	struct jpeg_decompress_struct _cinfo, *cinfo = &_cinfo;
	struct jpeg_error_mgr jerr;
	FILE * infile;
	ImBuf * ibuf;
	
	if ((infile = fopen(filename, "rb")) == NULL) {
		/*fprintf(stderr, "can't open %s\n", filename);*/
		return 0;
	}

	cinfo->err = jpeg_std_error(&jerr);
	jerr.error_exit = jpeg_error;

	jpeg_create_decompress(cinfo);
	jpeg_stdio_src(cinfo, infile);

	ibuf = ibJpegImageFromCinfo(cinfo, flags);
	
	fclose(infile);
	return(ibuf);
}

ImBuf * imb_ibJpegImageFromMemory (unsigned char * buffer, int size, int flags)
{
	struct jpeg_decompress_struct _cinfo, *cinfo = &_cinfo;
	struct jpeg_error_mgr jerr;
	ImBuf * ibuf;
	
	cinfo->err = jpeg_std_error(&jerr);
	jerr.error_exit = jpeg_error;

	jpeg_create_decompress(cinfo);
	memory_source(cinfo, buffer, size);

	ibuf = ibJpegImageFromCinfo(cinfo, flags);
	
	return(ibuf);
}


static void write_jpeg(struct jpeg_compress_struct * cinfo, struct ImBuf * ibuf)
{
	JSAMPLE * buffer = 0;
	JSAMPROW row_pointer[1];
	uchar * rect;
	int x, y;
	char neogeo[128];


	jpeg_start_compress(cinfo, TRUE);

	strcpy(neogeo, "NeoGeo");
	ibuf_ftype = BIG_LONG(ibuf->ftype);
	
	memcpy(neogeo + 6, &ibuf_ftype, 4);
	jpeg_write_marker(cinfo, 0xe1, (JOCTET*) neogeo, 10);

	row_pointer[0] =
		mallocstruct(JSAMPLE,
					 cinfo->input_components *
					 cinfo->image_width);

	for(y = ibuf->y - 1; y >= 0; y--){
		rect = (uchar *) (ibuf->rect + y * ibuf->x);
		buffer = row_pointer[0];

		switch(cinfo->in_color_space){
		case JCS_RGB:
			for (x = 0; x < ibuf->x; x++) {
				*buffer++ = rect[0];
				*buffer++ = rect[1];
				*buffer++ = rect[2];
				rect += 4;
			}
			break;
		case JCS_GRAYSCALE:
			for (x = 0; x < ibuf->x; x++) {
				*buffer++ = rect[0];
				rect += 4;
			}
			break;
		case JCS_UNKNOWN:
			memcpy(buffer, rect, 4 * ibuf->x);
			break;
			/* default was missing... intentional ? */
		default:
			; /* do nothing */
		}

		jpeg_write_scanlines(cinfo, row_pointer, 1);

		if (jpeg_failed) break;
	}

	if (jpeg_failed == FALSE) jpeg_finish_compress(cinfo);
	free(row_pointer[0]);
}


static int init_jpeg(FILE * outfile, struct jpeg_compress_struct * cinfo, struct ImBuf *ibuf)
{
	int quality;

	quality = ibuf->ftype & 0xff;
	if (quality <= 0) quality = jpeg_default_quality;
	if (quality > 100) quality = 100;

	jpeg_create_compress(cinfo);
	jpeg_stdio_dest(cinfo, outfile);

	cinfo->image_width = ibuf->x;
	cinfo->image_height = ibuf->y;

	cinfo->in_color_space = JCS_RGB;
	if (ibuf->depth == 8 && ibuf->cmap == 0) cinfo->in_color_space = JCS_GRAYSCALE;
	if (ibuf->depth == 32) cinfo->in_color_space = JCS_UNKNOWN;
	
	switch(cinfo->in_color_space){
	case JCS_RGB:
		cinfo->input_components = 3;
		break;
	case JCS_GRAYSCALE:
		cinfo->input_components = 1;
		break;
	case JCS_UNKNOWN:
		cinfo->input_components = 4;
		break;
		/* default was missing... intentional ? */
	default:
		; /* do nothing */
	}
	jpeg_set_defaults(cinfo);
	
	/* own settings */

	cinfo->dct_method = JDCT_FLOAT;
	jpeg_set_quality(cinfo, quality, TRUE);

	return(0);
}


static int save_stdjpeg(char * name, struct ImBuf * ibuf)
{
	FILE * outfile;
	struct jpeg_compress_struct _cinfo, *cinfo = &_cinfo;
	struct jpeg_error_mgr jerr;

	if ((outfile = fopen(name, "wb")) == NULL) return(-1);
	jpeg_default_quality = 75;

	cinfo->err = jpeg_std_error(&jerr);
	jerr.error_exit = jpeg_error;

	init_jpeg(outfile, cinfo, ibuf);

	write_jpeg(cinfo, ibuf);

	fclose(outfile);
	jpeg_destroy_compress(cinfo);

	if (jpeg_failed) remove(name);
	return(jpeg_failed);
}


static int save_vidjpeg(char * name, struct ImBuf * ibuf)
{
	FILE * outfile;
	struct jpeg_compress_struct _cinfo, *cinfo = &_cinfo;
	struct jpeg_error_mgr jerr;

	if ((outfile = fopen(name, "wb")) == NULL) return(-1);
	jpeg_default_quality = 90;

	cinfo->err = jpeg_std_error(&jerr);
	jerr.error_exit = jpeg_error;

	init_jpeg(outfile, cinfo, ibuf);

	/* adjust scaling factors */
	if (cinfo->in_color_space == JCS_RGB) {
		cinfo->comp_info[0].h_samp_factor = 2;
		cinfo->comp_info[0].v_samp_factor = 1;
	}

	write_jpeg(cinfo, ibuf);

	fclose(outfile);
	jpeg_destroy_compress(cinfo);

	if (jpeg_failed) remove(name);
	return(jpeg_failed);
}

static int save_jstjpeg(char * name, struct ImBuf * ibuf)
{
	char fieldname[1024];
	struct ImBuf * tbuf;
	int oldy;
/*  	extern rectcpy(); */

	tbuf = IMB_allocImBuf(ibuf->x, ibuf->y / 2, 24, IB_rect, 0);
	tbuf->ftype = ibuf->ftype;
	tbuf->flags = ibuf->flags;
	
	oldy = ibuf->y;
	ibuf->x *= 2;
	ibuf->y /= 2;

	/* extra argument assumed to be 0 (nzc) */
/*  	rectop(tbuf, ibuf, 0, 0, 0, 0, 32767, 32767, rectcpy); */
	IMB_rectop(tbuf, ibuf, 0, 0, 0, 0, 32767, 32767, IMB_rectcpy, 0);
	sprintf(fieldname, "%s.jf0", name);

	if (save_vidjpeg(fieldname, tbuf) == 0) {
	/* extra argument assumed to be 0 (nzc) */
/*  		rectop(tbuf, ibuf, 0, 0, tbuf->x, 0, 32767, 32767, rectcpy); */
		IMB_rectop(tbuf, ibuf, 0, 0, tbuf->x, 0, 32767, 32767, IMB_rectcpy, 0);
		sprintf(fieldname, "%s.jf1", name);
		save_vidjpeg(fieldname, tbuf);
	}

	ibuf->y = oldy;
	ibuf->x /= 2;
	IMB_freeImBuf(tbuf);

	/* no return value was given, assuming 0 */
	return 0;
}


static int save_maxjpeg(char * name, struct ImBuf * ibuf)
{
	FILE * outfile;
	struct jpeg_compress_struct _cinfo, *cinfo = &_cinfo;
	struct jpeg_error_mgr jerr;

	if ((outfile = fopen(name, "wb")) == NULL) return(-1);
	jpeg_default_quality = 100;

	cinfo->err = jpeg_std_error(&jerr);
	jerr.error_exit = jpeg_error;

	init_jpeg(outfile, cinfo, ibuf);

	/* adjust scaling factors */
	if (cinfo->in_color_space == JCS_RGB) {
		cinfo->comp_info[0].h_samp_factor = 1;
		cinfo->comp_info[0].v_samp_factor = 1;
	}

	write_jpeg(cinfo, ibuf);

	fclose(outfile);
	jpeg_destroy_compress(cinfo);

	if (jpeg_failed) remove(name);
	return(jpeg_failed);
}


int imb_save_jpeg(char * name, struct ImBuf * ibuf, int flags)
{
	int ret;
	
	ibuf->flags = flags;
	if (IS_stdjpg(ibuf)) ret = save_stdjpeg(name, ibuf);
	else if (IS_jstjpg(ibuf)) ret = save_jstjpeg(name, ibuf);
	else if (IS_maxjpg(ibuf)) ret = save_maxjpeg(name, ibuf);
	else ret = save_vidjpeg(name, ibuf);
	return(ret);
}

