/*
 *
 * ***** BEGIN GPL 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.
 *
 * 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.
 *
 * 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 LICENSE BLOCK *****
 * $Id$
 */

/** \file blender/imbuf/intern/targa.c
 *  \ingroup imbuf
 */


#ifdef WIN32
#include <io.h>
#endif
#include "BLI_blenlib.h"
#include "MEM_guardedalloc.h"

#include "imbuf.h"

#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"

#include "IMB_allocimbuf.h"
#include "IMB_filetype.h"


/* this one is only def-ed once, strangely... related to GS? */
#define GSS(x) (((uchar *)(x))[1] << 8 | ((uchar *)(x))[0])

/***/

typedef struct TARGA 
{
	unsigned char numid;	
	unsigned char maptyp;
	unsigned char imgtyp;	
	short maporig;
	short mapsize;
	unsigned char mapbits;
	short xorig;
	short yorig;
	short xsize;
	short ysize;
	unsigned char pixsize;
	unsigned char imgdes;
} TARGA;

/***/

static int tga_out1(unsigned int data, FILE *file)
{
	uchar *p;

	p = (uchar *) & data;
	if (putc(p[0],file) == EOF) return(EOF);
	return (~EOF);
}

static int tga_out2(unsigned int data, FILE * file)
{
	uchar *p;

	p = (uchar *) & data;
	if (putc(p[0],file) == EOF) return(EOF);
	if (putc(p[1],file) == EOF) return(EOF);
	return (~EOF);
}


static int tga_out3(unsigned int data, FILE * file)
{
	uchar *p;

	p = (uchar *) & data;
	if (putc(p[2],file) == EOF) return(EOF);
	if (putc(p[1],file) == EOF) return(EOF);
	if (putc(p[0],file) == EOF) return(EOF);
	return (~EOF);
}


static int tga_out4(unsigned int data, FILE * file)
{
	uchar *p;

	p = (uchar *) & data;
	/* order = bgra */
	if (putc(p[2],file) == EOF) return(EOF);
	if (putc(p[1],file) == EOF) return(EOF);
	if (putc(p[0],file) == EOF) return(EOF);
	if (putc(p[3],file) == EOF) return(EOF);
	return (~EOF);
}

static short makebody_tga(ImBuf * ibuf, FILE * file, int (*out)(unsigned int, FILE*))
{
	register int last,this;
	register int copy, bytes;
	register unsigned int *rect, *rectstart, *temp;
	int y;
	
	for (y = 0; y < ibuf->y; y++) {
		bytes = ibuf->x - 1;
		rectstart = rect = ibuf->rect + (y * ibuf->x);
		last = *rect++;
		this = *rect++;
		copy = last^this;
		while (bytes > 0){
			if (copy){
				do{
					last = this;
					this = *rect++;
					if (last == this){
						if (this == rect[-3]){	/* three the same? */
							bytes --;		/* set bytes */
							break;
						}
					}
				}while (--bytes != 0);

				copy = rect-rectstart;
				copy --;
				if (bytes) copy -= 2;

				temp = rect;
				rect = rectstart;

				while (copy){
					last = copy;
					if (copy>=128) last = 128;
					copy -= last;
					if (fputc(last-1,file) == EOF) return(0);
					do{
						if (out(*rect++,file) == EOF) return(0);
					}while(--last != 0);
				}
				rectstart = rect;
				rect = temp;
				last = this;

				copy = FALSE;
			} else {
				while (*rect++ == this){		/* seek for first different byte */
					if (--bytes == 0) break;	/* oor end of line */
				}
				rect --;
				copy = rect-rectstart;
				rectstart = rect;
				bytes --;
				this = *rect++;

				while (copy){
					if (copy>128){
						if (fputc(255,file) == EOF) return(0);
						copy -= 128;
					} else {
						if (copy == 1){
							if (fputc(0,file) == EOF) return(0);
						} else if (fputc(127 + copy,file) == EOF) return(0);
						copy = 0;
					}
					if (out(last,file) == EOF) return(0);
				}
				copy=TRUE;
			}
		}
	}
	return (1);
}

static int dumptarga(struct ImBuf * ibuf, FILE * file)
{
	int size;
	uchar *rect;

	if (ibuf == NULL) return (0);
	if (ibuf->rect == NULL) return (0);

	size = ibuf->x * ibuf->y;
	rect = (uchar *) ibuf->rect;

	if (ibuf->depth <= 8) {
		while(size > 0){
			if (putc(*rect, file) == EOF) return (0);
			size--;
			rect += 4;
		}
	} else if (ibuf->depth <= 16) {
		while(size > 0){
			putc(rect[0], file);
			if (putc(rect[1], file) == EOF) return (0);
			size--;
			rect += 4;
		}
	} else if (ibuf->depth <= 24) {
		while(size > 0){
			putc(rect[2], file);
			putc(rect[1], file);
			if (putc(rect[0], file) == EOF) return (0);
			size--;
			rect += 4;
		}
	} else if (ibuf->depth <= 32) {
		while(size > 0){
			putc(rect[2], file);
			putc(rect[1], file);
			putc(rect[0], file);
			if (putc(rect[3], file) == EOF) return (0);
			size--;
			rect += 4;
		}
	} else return (0);
	
	return (1);
}


int imb_savetarga(struct ImBuf * ibuf, const char *name, int flags)
{
	char buf[20]= {0};
	FILE *fildes;
	short ok = 0;
	
	(void)flags; /* unused */

	buf[16] = (ibuf->depth + 0x7 ) & ~0x7;
	if (ibuf->depth > 8 ){
		buf[2] = 10;
	} else{
		buf[2] = 11;
	}

	if (ibuf->ftype == RAWTGA) buf[2] &= ~8;
	
	buf[8] = 0;
	buf[9] = 0;
	buf[10] = 0;
	buf[11] = 0;

	buf[12] = ibuf->x & 0xff;
	buf[13] = ibuf->x >> 8;
	buf[14] = ibuf->y & 0xff;
	buf[15] = ibuf->y >> 8;

	/* Don't forget to indicate that your 32 bit
	 * targa uses 8 bits for the alpha channel! */
	if (ibuf->depth==32) {
		buf[17] |= 0x08;
	}
	fildes = fopen(name,"wb");
		if (!fildes) return 0;

	if (fwrite(buf, 1, 18,fildes) != 18) {
		fclose(fildes);
		return (0);
	}

	if (ibuf->ftype == RAWTGA) {
		ok = dumptarga(ibuf, fildes);
	} else {		
		switch((ibuf->depth + 7) >> 3){
		case 1:
			ok = makebody_tga(ibuf, fildes, tga_out1);
			break;
		case 2:
			ok = makebody_tga(ibuf, fildes, tga_out2);
			break;
		case 3:
			ok = makebody_tga(ibuf, fildes, tga_out3);
			break;
		case 4:
			ok = makebody_tga(ibuf, fildes, tga_out4);
			break;
		}
	}
	
	fclose(fildes);
	return (ok);
}


static int checktarga(TARGA *tga, unsigned char *mem)
{
	tga->numid = mem[0];
	tga->maptyp = mem[1];
	tga->imgtyp = mem[2];

	tga->maporig = GSS(mem+3);
	tga->mapsize = GSS(mem+5);
	tga->mapbits = mem[7];
	tga->xorig = GSS(mem+8);
	tga->yorig = GSS(mem+10);
	tga->xsize = GSS(mem+12);
	tga->ysize = GSS(mem+14);
	tga->pixsize = mem[16];
	tga->imgdes = mem[17];

	if (tga->maptyp > 1) return(0);
	switch (tga->imgtyp){
	case 1:			/* raw cmap */
	case 2:			/* raw rgb */
	case 3:			/* raw b&w */
	case 9:			/* cmap */
	case 10:			/* rgb */
	case 11:			/* b&w */
		break;
	default:
		return(0);
	}
	if (tga->mapsize && tga->mapbits > 32) return(0);
	if (tga->xsize <= 0 || tga->xsize >= 8192) return(0);
	if (tga->ysize <= 0 || tga->ysize >= 8192) return(0);
	if (tga->pixsize > 32) return(0);
	if (tga->pixsize == 0) return(0);
	return(1);
}

int imb_is_a_targa(unsigned char *buf) {
	TARGA tga;
	
	return checktarga(&tga, buf);
}

static void complete_partial_load(struct ImBuf *ibuf, unsigned int *rect)
{
	int size = (ibuf->x * ibuf->y) - (rect - ibuf->rect);
	if(size) {
		printf("decodetarga: incomplete file, %.1f%% missing\n", 100*((float)size / (ibuf->x * ibuf->y)));

		/* not essential but makes displaying partially rendered TGA's less ugly  */
		memset(rect, 0, size);
	}
	else {
		/* shouldnt happen */
		printf("decodetarga: incomplete file, all pixels written\n");
	}
}

static void decodetarga(struct ImBuf *ibuf, unsigned char *mem, size_t mem_size, int psize)
{
	unsigned char *mem_end = mem+mem_size;
	int count, col, size;
	unsigned int *rect;
	uchar * cp = (uchar *) &col;
	
	if (ibuf == NULL) return;
	if (ibuf->rect == NULL) return;

	size = ibuf->x * ibuf->y;
	rect = ibuf->rect;
	
	/* set alpha */
	cp[0] = 0xff;
	cp[1] = cp[2] = 0;

	while(size > 0){
		count = *mem++;

		if(mem>mem_end)
			goto partial_load;

		if (count >= 128) {
			/*if (count == 128) printf("TARGA: 128 in file !\n");*/
			count -= 127;

			if (psize & 2){
				if (psize & 1){
					/* order = bgra */
					cp[0] = mem[3];
					cp[1] = mem[0];
					cp[2] = mem[1];
					cp[3] = mem[2];
					/*col = (mem[3] << 24) + (mem[0] << 16) + (mem[1] << 8) + mem[2];*/
					mem += 4;
				} else{
					cp[1] = mem[0];
					cp[2] = mem[1];
					cp[3] = mem[2];
					/*col = 0xff000000 + (mem[0] << 16) + (mem[1] << 8) + mem[2];*/
					mem += 3;
				}
			} else{
				if (psize & 1){
					cp[0] = mem[0];
					cp[1] = mem[1];
					mem += 2;
				} else{
					col = *mem++;
				}
			}

			size -= count;
			if (size >= 0) {
				while (count > 0) {
					*rect++ = col;
					count--;
				}
			}
		} else{
			count ++;
			size -= count;
			if (size >= 0) {
				while (count > 0){
					if (psize & 2){
						if (psize & 1){
							/* order = bgra */
							cp[0] = mem[3];
							cp[1] = mem[0];
							cp[2] = mem[1];
							cp[3] = mem[2];
							/*col = (mem[3] << 24) + (mem[0] << 16) + (mem[1] << 8) + mem[2];*/
							mem += 4;
						} else{
							cp[1] = mem[0];
							cp[2] = mem[1];
							cp[3] = mem[2];
							/*col = 0xff000000 + (mem[0] << 16) + (mem[1] << 8) + mem[2];*/
							mem += 3;
						}
					} else{
						if (psize & 1){
							cp[0] = mem[0];
							cp[1] = mem[1];
							mem += 2;
						} else{
							col = *mem++;
						}
					}
					*rect++ = col;
					count --;

					if(mem>mem_end)
						goto partial_load;
				}

				if(mem>mem_end)
					goto partial_load;
			}
		}
	}
	if (size) {
		printf("decodetarga: count would overwrite %d pixels\n", -size);
	}
	return;

partial_load:
	complete_partial_load(ibuf, rect);
}

static void ldtarga(struct ImBuf * ibuf,unsigned char * mem, size_t mem_size, int psize)
{
	unsigned char *mem_end = mem+mem_size;
	int col,size;
	unsigned int *rect;
	uchar * cp = (uchar *) &col;

	if (ibuf == NULL) return;
	if (ibuf->rect == NULL) return;

	size = ibuf->x * ibuf->y;
	rect = ibuf->rect;

	/* set alpha */
	cp[0] = 0xff;
	cp[1] = cp[2] = 0;

	while(size > 0){
		if(mem>mem_end)
			goto partial_load;

		if (psize & 2){
			if (psize & 1){
				/* order = bgra */
				cp[0] = mem[3];
				cp[1] = mem[0];
				cp[2] = mem[1];
				cp[3] = mem[2];
				/*col = (mem[3] << 24) + (mem[0] << 16) + (mem[1] << 8) + mem[2];*/
				mem += 4;
			} else{
				/* set alpha for 24 bits colors */
				cp[1] = mem[0];
				cp[2] = mem[1];
				cp[3] = mem[2];
				/*col = 0xff000000 + (mem[0] << 16) + (mem[1] << 8) + mem[2];*/
				mem += 3;
			}
		} else{
			if (psize & 1){
				cp[0] = mem[0];
				cp[1] = mem[1];
				mem += 2;
			} else{
				col = *mem++;
			}
		}
		*rect++ = col;
		size--;
	}
	return;

partial_load:
	complete_partial_load(ibuf, rect);
}


struct ImBuf *imb_loadtarga(unsigned char *mem, size_t mem_size, int flags)
{
	TARGA tga;
	struct ImBuf * ibuf;
	int col, count, size;
	unsigned int *rect, *cmap= NULL /*, mincol= 0*/, maxcol= 0;
	uchar * cp = (uchar *) &col;
	
	if (checktarga(&tga,mem) == 0) return(NULL);

	if (flags & IB_test) ibuf = IMB_allocImBuf(tga.xsize,tga.ysize,tga.pixsize, 0);
	else ibuf = IMB_allocImBuf(tga.xsize,tga.ysize,(tga.pixsize + 0x7) & ~0x7, IB_rect);

	if (ibuf == NULL) return(NULL);
	ibuf->ftype = TGA;
	ibuf->profile = IB_PROFILE_SRGB;
	mem = mem + 18 + tga.numid;
	
	cp[0] = 0xff;
	cp[1] = cp[2] = 0;
	
	if (tga.mapsize){
		/* load color map */
		/*mincol = tga.maporig;*/ /*UNUSED*/
		maxcol = tga.mapsize;
		cmap = MEM_callocN(sizeof(unsigned int)*maxcol, "targa cmap");

		for (count = 0 ; count < maxcol ; count ++) {
			switch (tga.mapbits >> 3) {
				case 4:
					cp[0] = mem[3];
					cp[1] = mem[0];
					cp[2] = mem[1];
					cp[3] = mem[2];
					mem += 4;
					break;
				case 3:
					cp[1] = mem[0];
					cp[2] = mem[1];
					cp[3] = mem[2];
					mem += 3;
					break;
				case 2:
					cp[1] = mem[1];
					cp[0] = mem[0];
					mem += 2;
					break;
				case 1:
					col = *mem++;
					break;
			}
			cmap[count] = col;
		}
		
		size = 0;
		for (col = maxcol - 1; col > 0; col >>= 1) size++;
		ibuf->depth = size;

		if (tga.mapbits != 32) {	/* set alpha bits  */
			cmap[0] &= BIG_LONG(0x00ffffffl);
		}
	}
	
	if (flags & IB_test) return (ibuf);

	if (tga.imgtyp != 1 && tga.imgtyp != 9) { /* happens sometimes (beuh) */
		if(cmap) {
			MEM_freeN(cmap); 
			cmap= NULL;
		}
	}

	switch(tga.imgtyp){
	case 1:
	case 2:
	case 3:
		if (tga.pixsize <= 8) ldtarga(ibuf,mem,mem_size,0);
		else if (tga.pixsize <= 16) ldtarga(ibuf,mem,mem_size,1);
		else if (tga.pixsize <= 24) ldtarga(ibuf,mem,mem_size,2);
		else if (tga.pixsize <= 32) ldtarga(ibuf,mem,mem_size,3);
		break;
	case 9:
	case 10:
	case 11:
		if (tga.pixsize <= 8) decodetarga(ibuf,mem,mem_size,0);
		else if (tga.pixsize <= 16) decodetarga(ibuf,mem,mem_size,1);
		else if (tga.pixsize <= 24) decodetarga(ibuf,mem,mem_size,2);
		else if (tga.pixsize <= 32) decodetarga(ibuf,mem,mem_size,3);
		break;
	}
	
	if(cmap) {
		/* apply color map */
		rect = ibuf->rect;
		for(size = ibuf->x * ibuf->y; size>0; --size, ++rect) {
			col = *rect;
			if (col >= 0 && col < maxcol) *rect = cmap[col];
		}

		MEM_freeN(cmap);
	}
	
	if (tga.pixsize == 16) {
		rect = ibuf->rect;
		for (size = ibuf->x * ibuf->y; size > 0; --size, ++rect){
			col = *rect;
			cp = (uchar*)rect; 
			mem = (uchar*)&col;

			cp[3] = ((mem[1] << 1) & 0xf8);
			cp[2] = ((mem[0] & 0xe0) >> 2) + ((mem[1] & 0x03) << 6);
			cp[1] = ((mem[0] << 3) & 0xf8);
			cp[1] += cp[1] >> 5;
			cp[2] += cp[2] >> 5;
			cp[3] += cp[3] >> 5;
			cp[0] = 0xff;
		}
		ibuf->depth = 24;
	}
	
	if (tga.imgtyp == 3 || tga.imgtyp == 11){
		uchar *crect;
		unsigned int *lrect, col;
		
		crect = (uchar *) ibuf->rect;
		lrect = (unsigned int *) ibuf->rect;
		
		for (size = ibuf->x * ibuf->y; size > 0; size --){
			col = *lrect++;
			
			crect[0] = 255;
			crect[1] = crect[2] = crect[3] = col;
			crect += 4;
		}
	}
	
	if (tga.imgdes & 0x20) IMB_flipy(ibuf);

	if (ibuf && ibuf->rect)
		IMB_convert_rgba_to_abgr(ibuf);
	
	return(ibuf);
}