/* AbiSource Program Utilities
 * Copyright (C) 1998 AbiSource, Inc.
 * 
 * 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., 59 Temple Place - Suite 330, Boston, MA  
 * 02111-1307, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ut_types.h"
#include "ut_debugmsg.h"
#include "ut_assert.h"
#include "ut_misc.h"
#include "ut_hash.h"
#include "ut_string.h"

#include <Bitmap.h>

/*****************************************************************/

UT_Bool UT_Xpm2Bitmap(const char ** pIconData,
				   UT_uint32 sizeofData,
				   BBitmap ** pBitmap) {
	BBitmap *pBBitmap;

	// convert an XPM into a BBitmap
	// return true if successful.

	UT_ASSERT(pIconData && *pIconData);
	UT_ASSERT(sizeofData > 0);
	UT_ASSERT(pBitmap);

	// first row contains: width height, number of colors, chars per pixel
	UT_uint32 width, height, nrColors, charsPerPixel;
	UT_uint32 n = sscanf(pIconData[0],"%ld %ld %ld %ld",
					 &width,&height,&nrColors,&charsPerPixel);
	UT_ASSERT(n == 4);
	UT_ASSERT(width > 0);
	UT_ASSERT(height > 0);
	UT_ASSERT((nrColors > 0) && (nrColors < 256));
	UT_ASSERT(charsPerPixel > 0);

	//Create a new BBitmap with that width/height ...
	pBBitmap = new BBitmap(BRect(0, 0, width-1, height-1), B_RGB32);
	if (!pBBitmap) 
		return(UT_FALSE);

	rgb_color *pRGB = (rgb_color*)malloc((nrColors + 1) * sizeof(rgb_color));
	UT_ASSERT(pRGB);

	UT_HashTable hash(61);
	UT_RGBColor color(0,0,0);
	
	// walk thru the palette
	const char ** pIconDataPalette = &pIconData[1];
	for (UT_uint32 k=0; (k < nrColors); k++)
	{
		char bufSymbol[10];
		char bufKey[10];
		char bufColorValue[100];

		// we expect something of the form: ".. c #000000"
		// but we allow a space as a character in the symbol, so we
		// get the first field the hard way.
		memset(bufSymbol,0,sizeof(bufSymbol));
		for (UT_uint32 kPx=0; (kPx < charsPerPixel); kPx++)
			bufSymbol[kPx] = pIconDataPalette[k][kPx];
		UT_ASSERT(strlen(bufSymbol) == charsPerPixel);
		
		UT_uint32 nf = sscanf(&pIconDataPalette[k][charsPerPixel+1],
						" %s %s",&bufKey,&bufColorValue);
		UT_ASSERT(nf == 2);
		UT_ASSERT(bufKey[0] = 'c');

		// make the ".." a hash key and store our color index as the data.
		// we add k+1 because the hash code does not like null pointers...
		UT_sint32 resultHash = hash.addEntry(bufSymbol,0,(void *)(k+1));
		UT_ASSERT(resultHash != -1);
		
		// store the actual color value in the 
		// rgb quad array with our color index.
		if (UT_stricmp(bufColorValue,"None")==0) {
			pRGB[k].red = 219; 
			pRGB[k].green = 222;
			pRGB[k].blue = 219;
			pRGB[k].alpha = 255;//{255,255,255,255};//B_TRANSPARENT_32_BIT;
		}
		else
		{
			// TODO fix this to also handle 
			// #ffffeeeedddd type color references
			UT_ASSERT((bufColorValue[0] == '#') && strlen(bufColorValue)==7);
			UT_parseColor(bufColorValue, color);
			pRGB[k].red	= color.m_red;
			pRGB[k].green	= color.m_grn;
			pRGB[k].blue	= color.m_blu;
			pRGB[k].alpha	= 255;
		}
	}

	// walk thru the image data
	int rgb_index;
	uchar *bits = (uchar *)pBBitmap->Bits(); 

	const char ** pIconDataImage = &pIconDataPalette[nrColors];
	for (UT_uint32 kRow=0; (kRow < height); kRow++) {
		const char * p = pIconDataImage[kRow];
		
		for (UT_uint32 kCol=0; (kCol < width); kCol++) {
			char bufPixel[10];
			memset(bufPixel,0,sizeof(bufPixel));
			for (UT_uint32 kPx=0; (kPx < charsPerPixel); kPx++)
				bufPixel[kPx] = *p++;

			//printf("Looking for character %s \n", bufPixel);
			UT_HashEntry * pEntry = hash.findEntry(bufPixel);
			
			rgb_index = ((UT_Byte)(pEntry->pData)) -1;
			//printf("Returned hash index %d \n", rgb_index); 

			*(bits + kRow*pBBitmap->BytesPerRow() + kCol*4) 
							= pRGB[rgb_index].blue;
			*(bits + kRow*pBBitmap->BytesPerRow() + kCol*4 + 1) 
							= pRGB[rgb_index].green;
			*(bits + kRow*pBBitmap->BytesPerRow() + kCol*4 + 2) 
							= pRGB[rgb_index].red;
			*(bits + kRow*pBBitmap->BytesPerRow() + kCol*4 + 3) 
							= pRGB[rgb_index].alpha;
 
		}
	}

	free(pRGB);
	*pBitmap = pBBitmap;
	return(UT_TRUE);
}