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/*
 * beryl-plugins::jpeg.c - adds JPEG image support to beryl.
 * Copyright: (C) 2006 Nicholas Thomas
 *		       Danny Baumann (JPEG writing, option stuff)
 *
 * 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.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

#define _GNU_SOURCE
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>

#include <compiz-core.h>

#include <X11/Xarch.h>
#include <jpeglib.h>
#include "imgjpeg_options.h"

static int displayPrivateIndex;

struct jpegErrorMgr
{
    struct  jpeg_error_mgr pub;	/* "public" fields */
    jmp_buf setjmp_buffer;	/* for return to caller */
};

typedef struct _JPEGDisplay
{
    FileToImageProc fileToImage;
    ImageToFileProc imageToFile;
} JPEGDisplay;

#define GET_JPEG_DISPLAY(d)				    \
    ((JPEGDisplay *) (d)->base.privates[displayPrivateIndex].ptr)

#define JPEG_DISPLAY(d)			 \
    JPEGDisplay *jd = GET_JPEG_DISPLAY (d)

static Bool
rgbToBGRA (const JSAMPLE *source,
	   void          **data,
	   int           height,
	   int           width,
	   int           alpha)
{
    int  h, w;
    char *dest;

    dest = malloc (height * width * 4);
    if (!dest)
	return FALSE;

    *data = dest;

    for (h = 0; h < height; h++)
	for (w = 0; w < width; w++)
	{
	    int pos = h * width + w;
#if __BYTE_ORDER == __BIG_ENDIAN
	    dest[(pos * 4) + 3] = source[(pos * 3) + 2];    /* blue */
	    dest[(pos * 4) + 2] = source[(pos * 3) + 1];    /* green */
	    dest[(pos * 4) + 1] = source[(pos * 3) + 0];    /* red */
	    dest[(pos * 4) + 0] = alpha;
#else
	    dest[(pos * 4) + 0] = source[(pos * 3) + 2];    /* blue */
	    dest[(pos * 4) + 1] = source[(pos * 3) + 1];    /* green */
	    dest[(pos * 4) + 2] = source[(pos * 3) + 0];    /* red */
	    dest[(pos * 4) + 3] = alpha;
#endif
	}

    return TRUE;
}

static Bool
rgbaToRGB (char    *source,
	   JSAMPLE **dest,
	   int     height,
	   int     width,
	   int     stride)
{
    int     h, w;
    int     ps = stride / width;	/* pixel size */
    JSAMPLE *d;

    d = malloc (height * width * 3 * sizeof (JSAMPLE));
    if (!d)
	return FALSE;

    *dest = d;

    for (h = 0; h < height; h++)
	for (w = 0; w < width; w++)
	{
	    int pos = h * width + w;
#if __BYTE_ORDER == __BIG_ENDIAN
	    d[(pos * 3) + 0] = source[(pos * ps) + 3];	/* red */
    	    d[(pos * 3) + 1] = source[(pos * ps) + 2];	/* green */
    	    d[(pos * 3) + 2] = source[(pos * ps) + 1];	/* blue */
#else
	    d[(pos * 3) + 0] = source[(pos * ps) + 0];	/* red */
    	    d[(pos * 3) + 1] = source[(pos * ps) + 1];	/* green */
    	    d[(pos * 3) + 2] = source[(pos * ps) + 2];	/* blue */
#endif
	}

    return TRUE;
}

static void
jpegErrorExit (j_common_ptr cinfo)
{
    char                buffer[JMSG_LENGTH_MAX];
    struct jpegErrorMgr *err = (struct jpegErrorMgr *) cinfo->err;

    /* Format the message */
    (*cinfo->err->format_message) (cinfo, buffer);

    printf("%s\n", buffer);

    /* Return control to the setjmp point */
    longjmp (err->setjmp_buffer, 1);
}

static Bool
readJPEGFileToImage (FILE *file,
		     int  *width,
		     int  *height,
		     void **data)
{
    struct jpeg_decompress_struct cinfo;
    struct jpegErrorMgr           jerr;
    JSAMPLE                       *buf;
    JSAMPROW                      *rows;
    int                           i;
    Bool                          result;

    if (!file)
	return FALSE;

    cinfo.err = jpeg_std_error (&jerr.pub);
    jerr.pub.error_exit = jpegErrorExit;

    if (setjmp (jerr.setjmp_buffer))
    {
	/* this is called on decompression errors */
	jpeg_destroy_decompress (&cinfo);
	return FALSE;
    }

    jpeg_create_decompress (&cinfo);

    jpeg_stdio_src (&cinfo, file);
    
    jpeg_read_header (&cinfo, TRUE);

    cinfo.out_color_space = JCS_RGB;

    jpeg_start_decompress (&cinfo);

    *height = cinfo.output_height;
    *width = cinfo.output_width;

    buf = calloc (cinfo.output_height * cinfo.output_width *
 		  cinfo.output_components, sizeof (JSAMPLE));
    if (!buf)
    {
	jpeg_finish_decompress (&cinfo);
	jpeg_destroy_decompress (&cinfo);
	return FALSE;
    }

    rows = malloc (cinfo.output_height * sizeof (JSAMPROW));
    if (!rows)
    {
	free (buf);
	jpeg_finish_decompress (&cinfo);
	jpeg_destroy_decompress (&cinfo);
	return FALSE;
    }

    for (i = 0; i < cinfo.output_height; i++)
	rows[i] = &buf[i * cinfo.output_width * cinfo.output_components];

    while (cinfo.output_scanline < cinfo.output_height)
	jpeg_read_scanlines (&cinfo, &rows[cinfo.output_scanline],
			     cinfo.output_height - cinfo.output_scanline);

    jpeg_finish_decompress (&cinfo);
    jpeg_destroy_decompress (&cinfo);

    /* convert the rgb data into BGRA format */
    result = rgbToBGRA (buf, data, *height, *width, 255);

    free (rows);
    free(buf);
    return result;
}

static Bool
writeJPEG (CompDisplay *d,
	   void        *buffer,
	   FILE        *file,
	   int         width,
	   int         height,
	   int         stride)
{
    struct jpeg_compress_struct cinfo;
    struct jpeg_error_mgr       jerr;
    JSAMPROW                    row_pointer[1];
    JSAMPLE                     *data;

    /* convert the rgb data into BGRA format */
    if (!rgbaToRGB (buffer, &data, height, width, stride))
	return FALSE;

    cinfo.err = jpeg_std_error (&jerr);
    jpeg_create_compress (&cinfo);

    jpeg_stdio_dest (&cinfo, file);

    cinfo.image_width      = width;
    cinfo.image_height     = height;
    cinfo.input_components = 3;
    cinfo.in_color_space   = JCS_RGB;

    jpeg_set_defaults (&cinfo);
    jpeg_set_quality (&cinfo, imgjpegGetQuality (d), TRUE);
    jpeg_start_compress (&cinfo, TRUE);

    while (cinfo.next_scanline < cinfo.image_height)
    {
	row_pointer[0] =
	    &data[(cinfo.image_height - cinfo.next_scanline - 1) * width * 3];
	jpeg_write_scanlines (&cinfo, row_pointer, 1);
    }

    jpeg_finish_compress (&cinfo);
    jpeg_destroy_compress (&cinfo);

    free (data);

    return TRUE;
}

/* Turns the path & name into a real, absolute path
   No extensions jiggery-pokery here, as JPEGs can be
   .jpg or .jpeg - or, indeed, whatever.
   Deals with the path, regardless of what it's passed. */
static char*
createFilename (const char *path,
		const char *name)
{
    char *filename = NULL;

    if (path && !name)
	asprintf (&filename, "%s", path);
    else if (!path && name)
	asprintf (&filename, "%s", name);
    else
	asprintf (&filename, "%s/%s", path, name);

    return filename;
}

static Bool
JPEGImageToFile (CompDisplay *d,
		 const char  *path,
		 const char  *name,
		 const char  *format,
		 int         width,
		 int         height,
		 int         stride,
		 void        *data)
{
    Bool status = FALSE;
    char *fileName;
    FILE *file;

    /* Not a JPEG */
    if (strcasecmp (format, "jpeg") != 0 && strcasecmp (format, "jpg") != 0)
    {
	JPEG_DISPLAY (d);
	UNWRAP (jd, d, imageToFile);
	status = (*d->imageToFile) (d, path, name, format,
				    width, height, stride, data);
	WRAP (jd, d, imageToFile, JPEGImageToFile);
	return status;
    }

    /* Is a JPEG */
    fileName = createFilename (path, name);
    if (!fileName)
	return FALSE;

    file = fopen (fileName, "wb");
    if (file)
    {
	status = writeJPEG (d, data, file, width, height, stride);
	fclose (file);
    }

    free (fileName);
    return status;
}

static Bool
JPEGFileToImage (CompDisplay *d,
		 const char  *path,
		 const char  *name,
		 int         *width,
		 int         *height,
		 int         *stride,
		 void        **data)
{
    Bool status = FALSE;
    char *fileName, *extension;

    JPEG_DISPLAY (d);

    fileName = createFilename (path, name);
    if (!fileName)
	return FALSE;

    /* Do some testing here to see if it's got a .jpg or .jpeg extension */
    extension = strrchr (fileName, '.');
    if (extension)
    {
	if (strcasecmp (extension, ".jpeg") == 0 ||
	    strcasecmp (extension, ".jpg") == 0)
	{
	    FILE *file;

	    file = fopen (fileName, "rb");
	    if (file)
	    {
		status = readJPEGFileToImage (file, width, height, data);
		fclose (file);

		if (status)		/* Success! */
		{
		    free (fileName);
    		    *stride = *width * 4;
		    return TRUE;
		}
	    }
	}
    }
    free (fileName);

    /* Isn't a JPEG - pass to the next in the chain. */
    UNWRAP (jd, d, fileToImage);
    status = (*d->fileToImage) (d, path, name, width, height, stride, data);
    WRAP (jd, d, fileToImage, JPEGFileToImage);

    return status;
}

static Bool
JPEGInitDisplay (CompPlugin  *p,
		 CompDisplay *d)
{
    JPEGDisplay *jd;

    if (!checkPluginABI ("core", CORE_ABIVERSION))
	return FALSE;

    jd = malloc (sizeof (JPEGDisplay));
    if (!jd)
	return FALSE;

    WRAP (jd, d, fileToImage, JPEGFileToImage);
    WRAP (jd, d, imageToFile, JPEGImageToFile);

    d->base.privates[displayPrivateIndex].ptr = jd;

    return TRUE;
}

static void
JPEGFiniDisplay (CompPlugin  *p,
		 CompDisplay *d)
{
    JPEG_DISPLAY (d);

    UNWRAP (jd, d, fileToImage);
    UNWRAP (jd, d, imageToFile);

    free (jd);
}

static CompBool
JPEGInitObject (CompPlugin *p,
		CompObject *o)
{
    static InitPluginObjectProc dispTab[] = {
	(InitPluginObjectProc) 0, /* InitCore */
	(InitPluginObjectProc) JPEGInitDisplay,
    };

    RETURN_DISPATCH (o, dispTab, ARRAY_SIZE (dispTab), TRUE, (p, o));
}

static void
JPEGFiniObject (CompPlugin *p,
		CompObject *o)
{
    static FiniPluginObjectProc dispTab[] = {
	(FiniPluginObjectProc) 0, /* FiniCore */
	(FiniPluginObjectProc) JPEGFiniDisplay,
    };

    DISPATCH (o, dispTab, ARRAY_SIZE (dispTab), (p, o));
}

static Bool
JPEGInit (CompPlugin *p)
{
    displayPrivateIndex = allocateDisplayPrivateIndex ();
    if (displayPrivateIndex < 0)
	return FALSE;

    return TRUE;
}

static void
JPEGFini (CompPlugin *p)
{
    freeDisplayPrivateIndex (displayPrivateIndex);
}

CompPluginVTable JPEGVTable = {
    "imgjpeg",
    0,
    JPEGInit,
    JPEGFini,
    JPEGInitObject,
    JPEGFiniObject,
    0,
    0
};

CompPluginVTable*
getCompPluginInfo (void)
{
    return &JPEGVTable;
}