/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2004 The ScummVM project
 *
 * 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.
 *
 * $Header$
 *
 */

#include "stdafx.h"
#include "scumm/bomp.h"
#include "scumm/charset.h"
#include "scumm/intern.h"
#include "scumm/object.h"
#include "scumm/scumm.h"


namespace Scumm {

/*
 * Mouse cursor cycle colors (for the default crosshair).
 */
static const byte default_v1_cursor_colors[4] = {
	1, 1, 12, 11
};

static const byte default_cursor_colors[4] = {
	15, 15, 7, 8
};



static uint16 default_cursor_images[5][16] = {
	/* cross-hair */
	{ 0x0080, 0x0080, 0x0080, 0x0080, 0x0080, 0x0080, 0x0000, 0x7e3f,
	  0x0000, 0x0080, 0x0080, 0x0080, 0x0080, 0x0080, 0x0080, 0x0000 },
	/* hourglass */
	{ 0x0000, 0x7ffe, 0x6006, 0x300c, 0x1818, 0x0c30, 0x0660, 0x03c0,
	  0x0660, 0x0c30, 0x1998, 0x33cc, 0x67e6, 0x7ffe, 0x0000, 0x0000 },
	/* arrow */
	{ 0x0000, 0x4000, 0x6000, 0x7000, 0x7800, 0x7c00, 0x7e00, 0x7f00,
	  0x7f80, 0x78c0, 0x7c00, 0x4600, 0x0600, 0x0300, 0x0300, 0x0180 },
	/* hand */
	{ 0x1e00, 0x1200, 0x1200, 0x1200, 0x1200, 0x13ff, 0x1249, 0x1249,
	  0xf249, 0x9001, 0x9001, 0x9001, 0x8001, 0x8001, 0x8001, 0xffff },
	/* cross-hair zak256 - chrilith palmos */
/*
	{ 0x0080, 0x0080, 0x02a0, 0x01c0, 0x0080, 0x1004, 0x0808, 0x7c1f,
	  0x0808, 0x1004, 0x0080, 0x01c0, 0x02a0, 0x0080, 0x0080, 0x0000 },
*/
	{ 0x0080, 0x02a0, 0x01c0, 0x0080, 0x0000, 0x2002, 0x1004, 0x780f,
	  0x1004, 0x2002, 0x0000, 0x0080, 0x01c0, 0x02a0, 0x0080, 0x0000 },
};

static const byte default_cursor_hotspots[10] = {
	8, 7,   8, 7,   1, 1,   5, 0,
	8, 7, //zak256
};

void ScummEngine::setupCursor() {
	_cursor.animate = 1;
}

void ScummEngine::animateCursor() {
	if (_cursor.animate) {
		if (!(_cursor.animateIndex & 0x1)) {
			setBuiltinCursor((_cursor.animateIndex >> 1) & 3);
		}
		_cursor.animateIndex++;
	}
}

void ScummEngine::setCursorHotspot(int x, int y) {
	_cursor.hotspotX = x;
	_cursor.hotspotY = y;
}

void ScummEngine::setCursorTransparency(int a) {
	int i, size;

	size = _cursor.width * _cursor.height;

	for (i = 0; i < size; i++)
		if (_grabbedCursor[i] == (byte)a)
			_grabbedCursor[i] = 0xFF;

	updateCursor();
}

void ScummEngine::updateCursor() {
	_system->setMouseCursor(_grabbedCursor, _cursor.width, _cursor.height,
							_cursor.hotspotX, _cursor.hotspotY);
}

void ScummEngine::grabCursor(int x, int y, int w, int h) {
	VirtScreen *vs = findVirtScreen(y);

	if (vs == NULL) {
		warning("grabCursor: invalid Y %d", y);
		return;
	}

	setCursorFromBuffer((byte *)vs->pixels + (y - vs->topline) * vs->pitch + x, w, h, vs->pitch);
}

void ScummEngine::setCursorFromBuffer(byte *ptr, int width, int height, int pitch) {
	uint size;
	byte *dst;

	size = width * height;
	if (size > sizeof(_grabbedCursor))
		error("grabCursor: grabbed cursor too big");

	_cursor.width = width;
	_cursor.height = height;
	_cursor.animate = 0;

	dst = _grabbedCursor;
	for (; height; height--) {
		memcpy(dst, ptr, width);
		dst += width;
		ptr += pitch;
	}

	updateCursor();
}

void ScummEngine_v6::setCursorFromImg(uint img, uint room, uint imgindex) {
	int w, h;
	const byte *dataptr, *bomp;
	uint32 size;
	FindObjectInRoom foir;

	if (room == (uint) - 1)
		room = getObjectRoom(img);

	findObjectInRoom(&foir, foCodeHeader | foImageHeader | foCheckAlreadyLoaded, img, room);

	if (_version == 8) {
		setCursorHotspot(READ_LE_UINT32(&foir.imhd->v8.hotspot[0].x),
		                  READ_LE_UINT32(&foir.imhd->v8.hotspot[0].y));
		w = READ_LE_UINT32(&foir.imhd->v8.width) / 8;
		h = READ_LE_UINT32(&foir.imhd->v8.height) / 8;
	} else if (_version == 7) {
		setCursorHotspot(READ_LE_UINT16(&foir.imhd->v7.hotspot[0].x),
		                  READ_LE_UINT16(&foir.imhd->v7.hotspot[0].y));
		w = READ_LE_UINT16(&foir.imhd->v7.width) / 8;
		h = READ_LE_UINT16(&foir.imhd->v7.height) / 8;
	} else {
		if (!(_features & GF_HUMONGOUS))
			setCursorHotspot(READ_LE_UINT16(&foir.imhd->old.hotspot[0].x),
		        	          READ_LE_UINT16(&foir.imhd->old.hotspot[0].y));
		w = READ_LE_UINT16(&foir.cdhd->v6.w) / 8;
		h = READ_LE_UINT16(&foir.cdhd->v6.h) / 8;
	}

	dataptr = getObjectImage(foir.obim, imgindex);
	assert(dataptr);
	if (_version == 8) {
		bomp = dataptr;
	} else {
		size = READ_BE_UINT32(dataptr + 4);
		if (size > sizeof(_grabbedCursor))
			error("setCursorFromImg: Cursor image too large");
		
		bomp = findResource(MKID('BOMP'), dataptr);
	}

	if (bomp != NULL)
		useBompCursor(bomp, w, h);
	else
		useIm01Cursor(dataptr, w, h);
}

void ScummEngine_v6::useIm01Cursor(const byte *im, int w, int h) {
	VirtScreen *vs = &virtscr[0];
	byte *buf, *dst;
	const byte *src;
	int i;

	w *= 8;
	h *= 8;

	// Backup the screen content
	dst = buf = (byte *)malloc(w * h);
	src = vs->getPixels(0, 0);

	for (i = 0; i < h; i++) {
		memcpy(dst, src, w);
		dst += w;
		src += vs->pitch;
	}

	// Do some drawing
	drawBox(0, 0, w - 1, h - 1, 0xFF);

	vs->hasTwoBuffers = false;
	gdi.disableZBuffer();
	gdi.drawBitmap(im, vs, _screenStartStrip, 0, w, h, 0, w / 8, 0);
	vs->hasTwoBuffers = true;
	gdi.enableZBuffer();

	// Grab the data we just drew and setup the cursor with it
	setCursorFromBuffer(vs->getPixels(0, 0), w, h, vs->pitch);

	// Restore the screen content
	src = buf;
	dst = vs->getPixels(0, 0);

	for (i = 0; i < h; i++) {
		memcpy(dst, src, w);
		dst += vs->pitch;
		src += w;
	}

	free(buf);
}

void ScummEngine_v6::useBompCursor(const byte *im, int width, int height) {
	uint size;

	width *= 8;
	height *= 8;

	size = width * height;
	if (size > sizeof(_grabbedCursor))
		error("useBompCursor: cursor too big (%d)", size);

	_cursor.width = width;
	_cursor.height = height;
	_cursor.animate = 0;

	// Skip the header
	if (_version == 8) {
		im += 16;
	} else {
		im += 18;
	}
	decompressBomp(_grabbedCursor, im, width, height);

	updateCursor();
}

void ScummEngine::redefineBuiltinCursorFromChar(int index, int chr) {
	// Cursor image in both Looms are based on images from charset.
	// For now we don't handle them.
	if (_gameId != GID_LOOM && _gameId != GID_LOOM256) {
		// FIXME: Actually: is this opcode ever called by a non-Loom game?
		// Which V3-V5 game besides Loom makes use of custom cursors, ever?
		warning("V3--V5 SO_CURSOR_IMAGE(%d,%d) called - tell Fingolfin where you saw this!", index, chr);
	}
	
//	const int oldID = _charset->getCurID(); 

	if (_version == 3) {
		_charset->setCurID(0);
	} else if (_version >= 4) {
		_charset->setCurID(1);
	}

	Graphics::Surface s;
	byte buf[16*16];
	memset(buf, 123, 16*16);
	s.pixels = buf;
	s.w = _charset->getCharWidth(chr);
	s.h = _charset->getFontHeight();
	s.pitch = s.w;
	assert(s.w <= 16 && s.h <= 16);
	s.bytesPerPixel = 1;
	
	_charset->drawChar(chr, s, 0, 0);

	uint16 *ptr = default_cursor_images[index];
	memset(ptr, 0, 16 * sizeof(uint16));
	for (int h = 0; h < s.h; h++) {
		for (int w = 0; w < s.w; w++) {
			if (buf[s.pitch * h + w] != 123)
				*ptr |= 1 << (16 - w);
		}
		ptr++;
	}
	
//	_charset->setCurID(oldID);
}

void ScummEngine::setBuiltinCursor(int idx) {
	int i, j;
	byte color;

	memset(_grabbedCursor, 0xFF, sizeof(_grabbedCursor));

	if (_version == 1)
		color = default_v1_cursor_colors[idx];
	else
		color = default_cursor_colors[idx];

	if (_version <= 2) {
		_cursor.width = 23;
		_cursor.height = 21;
		_cursor.hotspotX = 11;
		_cursor.hotspotY = 10;

		byte *hotspot = _grabbedCursor + _cursor.hotspotY * _cursor.width + _cursor.hotspotX;

		// Crosshair, slightly assymetric
		// TODO: Instead of setting this up via code, we should simply extend
		//       default_cursor_images to contain this shape.

		for (i = 0; i < 7; i++) {
			*(hotspot - 5 - i) = color;
			*(hotspot + 5 + i) = color;
		}

		for (i = 0; i < 8; i++) {
			*(hotspot - _cursor.width * (3 + i)) = color;
			*(hotspot + _cursor.width * (3 + i)) = color;
		}

		// Arrow heads, diagonal lines

		for (i = 1; i <= 3; i++) {
			*(hotspot - _cursor.width * i - 5 - i) = color;
			*(hotspot + _cursor.width * i - 5 - i) = color;
			*(hotspot - _cursor.width * i + 5 + i) = color;
			*(hotspot + _cursor.width * i + 5 + i) = color;
			*(hotspot - _cursor.width * (i + 3) - i) = color;
			*(hotspot - _cursor.width * (i + 3) + i) = color;
			*(hotspot + _cursor.width * (i + 3) - i) = color;
			*(hotspot + _cursor.width * (i + 3) + i) = color;
		}

		// Final touches

		*(hotspot - _cursor.width - 7) = color;
		*(hotspot - _cursor.width + 7) = color;
		*(hotspot + _cursor.width - 7) = color;
		*(hotspot + _cursor.width + 7) = color;
		*(hotspot - (_cursor.width * 5) - 1) = color;
		*(hotspot - (_cursor.width * 5) + 1) = color;
		*(hotspot + (_cursor.width * 5) - 1) = color;
		*(hotspot + (_cursor.width * 5) + 1) = color;
	} else {
		byte currentCursor = _currentCursor;

#ifdef __PALM_OS__
		if (_gameId == GID_ZAK256 && currentCursor == 0)
			currentCursor = 4;
#endif

		_cursor.width = 16;
		_cursor.height = 16;
		_cursor.hotspotX = default_cursor_hotspots[2 * currentCursor];
		_cursor.hotspotY = default_cursor_hotspots[2 * currentCursor + 1];

		for (i = 0; i < 16; i++) {
			for (j = 0; j < 16; j++) {
				if (default_cursor_images[currentCursor][i] & (1 << j))	
					_grabbedCursor[16 * i + 15 - j] = color;
			}
		}
	}

	updateCursor();
}

} // End of namespace Scumm