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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

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#include "debug.h"

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#include "functions.h"

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#include "gui.h"

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#include "spritecache.h"

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#include "strings.h"

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#include "table/sprites.h"

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#include "table/strings.h"

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#include "map.h"

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#include "viewport.h"

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#include "window.h"

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#include "vehicle.h"

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#include "station.h"

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#include "gfx.h"

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#include "town.h"

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#include "signs.h"

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#include "waypoint.h"

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#include "variables.h"

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#include "train.h"

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    24

#define VIEWPORT_DRAW_MEM (65536 * 2)

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    26

static bool _added_tile_sprite;

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static bool _offset_ground_sprites;

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    29

/* The in-game coordiante system looks like this *

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 *                                               *

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 *                    ^ Z                        *

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 *                    |                          *

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 *                    |                          *

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 *                    |                          *

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 *                    |                          *

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 *                 /     \                       *

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 *              /           \                    *

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 *           /                 \                 *

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 *        /                       \              *

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 *   X <                             > Y         *

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 */

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    43

typedef struct StringSpriteToDraw {

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	uint16 string;

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	uint16 color;

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	struct StringSpriteToDraw *next;

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	int32 x;

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	int32 y;

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	uint32 params[2];

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	uint16 width;

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} StringSpriteToDraw;

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typedef struct TileSpriteToDraw {

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	uint32 image;

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	struct TileSpriteToDraw *next;

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	int32 x;

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	int32 y;

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	byte z;

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} TileSpriteToDraw;

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    61

typedef struct ChildScreenSpriteToDraw {

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	uint32 image;

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	int32 x;

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	int32 y;

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	struct ChildScreenSpriteToDraw *next;

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} ChildScreenSpriteToDraw;

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typedef struct ParentSpriteToDraw {

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	uint32 image;

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	int32 left;

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	int32 top;

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	int32 right;

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	int32 bottom;

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	int32 xmin;

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	int32 ymin;

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	int32 xmax;

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	int32 ymax;

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	ChildScreenSpriteToDraw *child;

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	byte unk16;

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	byte zmin;

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	byte zmax;

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} ParentSpriteToDraw;

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// Quick hack to know how much memory to reserve when allocating from the spritelist

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// to prevent a buffer overflow.

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#define LARGEST_SPRITELIST_STRUCT ParentSpriteToDraw

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    88

typedef struct ViewportDrawer {

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	DrawPixelInfo dpi;

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    91

	byte *spritelist_mem;

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	const byte *eof_spritelist_mem;

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	StringSpriteToDraw **last_string, *first_string;

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	TileSpriteToDraw **last_tile, *first_tile;

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	ChildScreenSpriteToDraw **last_child;

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	ParentSpriteToDraw **parent_list;

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	ParentSpriteToDraw * const *eof_parent_list;

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   102

	byte combine_sprites;

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   104

	int offs_x, offs_y; // used when drawing ground sprites relative

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} ViewportDrawer;

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   107

static ViewportDrawer *_cur_vd;

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   109

TileHighlightData _thd;

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static TileInfo *_cur_ti;

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   112

extern void SmallMapCenterOnCurrentPos(Window *w);

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   114

static Point MapXYZToViewport(const ViewPort *vp, uint x, uint y, uint z)

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{

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	Point p = RemapCoords(x, y, z);

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	p.x -= vp->virtual_width / 2;

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	p.y -= vp->virtual_height / 2;

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	return p;

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}

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   122

void AssignWindowViewport(Window *w, int x, int y,

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	int width, int height, uint32 follow_flags, byte zoom)

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{

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	ViewPort *vp;

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	Point pt;

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	uint32 bit;

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   129

	for (vp = _viewports, bit = 1; ; vp++, bit <<= 1) {

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		assert(vp != endof(_viewports));

   131

		if (vp->width == 0) break;

   132

	}

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	_active_viewports |= bit;

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	vp->left = x + w->left;

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	vp->top = y + w->top;

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	vp->width = width;

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	vp->height = height;

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	vp->zoom = zoom;

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	vp->virtual_width = width << zoom;

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	vp->virtual_height = height << zoom;

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   145

	if (follow_flags & 0x80000000) {

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		const Vehicle *veh;

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   148

		WP(w, vp_d).follow_vehicle = (VehicleID)(follow_flags & 0xFFFF);

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		veh = GetVehicle(WP(w, vp_d).follow_vehicle);

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		pt = MapXYZToViewport(vp, veh->x_pos, veh->y_pos, veh->z_pos);

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	} else {

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		uint x = TileX(follow_flags) * TILE_SIZE;

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		uint y = TileY(follow_flags) * TILE_SIZE;

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		WP(w, vp_d).follow_vehicle = INVALID_VEHICLE;

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		pt = MapXYZToViewport(vp, x, y, GetSlopeZ(x, y));

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	}

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	WP(w, vp_d).scrollpos_x = pt.x;

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	WP(w, vp_d).scrollpos_y = pt.y;

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	w->viewport = vp;

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	vp->virtual_left = 0;//pt.x;

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	vp->virtual_top = 0;//pt.y;

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}

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   166

static Point _vp_move_offs;

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   168

static void DoSetViewportPosition(Window *w, int left, int top, int width, int height)

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{

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	for (; w < _last_window; w++) {

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		if (left + width > w->left &&

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				w->left + w->width > left &&

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				top + height > w->top &&

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				w->top + w->height > top) {

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			if (left < w->left) {

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				DoSetViewportPosition(w, left, top, w->left - left, height);

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				DoSetViewportPosition(w, left + (w->left - left), top, width - (w->left - left), height);

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				return;

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			}

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			if (left + width > w->left + w->width) {

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				DoSetViewportPosition(w, left, top, (w->left + w->width - left), height);

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				DoSetViewportPosition(w, left + (w->left + w->width - left), top, width - (w->left + w->width - left) , height);

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				return;

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			}

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			if (top < w->top) {

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				DoSetViewportPosition(w, left, top, width, (w->top - top));

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				DoSetViewportPosition(w, left, top + (w->top - top), width, height - (w->top - top));

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				return;

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			}

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			if (top + height > w->top + w->height) {

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				DoSetViewportPosition(w, left, top, width, (w->top + w->height - top));

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				DoSetViewportPosition(w, left, top + (w->top + w->height - top), width , height - (w->top + w->height - top));

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				return;

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			}

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			return;

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		}

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	}

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	{

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		int xo = _vp_move_offs.x;

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		int yo = _vp_move_offs.y;

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		if (abs(xo) >= width || abs(yo) >= height) {

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			/* fully_outside */

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			RedrawScreenRect(left, top, left + width, top + height);

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			return;

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		}

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		GfxScroll(left, top, width, height, xo, yo);

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		if (xo > 0) {

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			RedrawScreenRect(left, top, xo + left, top + height);

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			left += xo;

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			width -= xo;

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		} else if (xo < 0) {

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			RedrawScreenRect(left+width+xo, top, left+width, top + height);

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			width += xo;

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		}

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		if (yo > 0) {

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			RedrawScreenRect(left, top, width+left, top + yo);

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		} else if (yo < 0) {

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			RedrawScreenRect(left, top + height + yo, width+left, top + height);

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		}

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	}

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}

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static void SetViewportPosition(Window *w, int x, int y)

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{

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	ViewPort *vp = w->viewport;

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	int old_left = vp->virtual_left;

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	int old_top = vp->virtual_top;

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	int i;

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	int left, top, width, height;

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	vp->virtual_left = x;

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	vp->virtual_top = y;

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   244

	old_left >>= vp->zoom;

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	old_top >>= vp->zoom;

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	x >>= vp->zoom;

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	y >>= vp->zoom;

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   249

	old_left -= x;

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	old_top -= y;

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   252

	if (old_top == 0 && old_left == 0) return;

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   254

	_vp_move_offs.x = old_left;

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	_vp_move_offs.y = old_top;

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	left = vp->left;

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	top = vp->top;

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	width = vp->width;

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	height = vp->height;

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   262

	if (left < 0) {

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		width += left;

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		left = 0;

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	}

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	i = left + width - _screen.width;

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	if (i >= 0) width -= i;

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   270

	if (width > 0) {

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		if (top < 0) {

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			height += top;

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			top = 0;

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		}

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   276

		i = top + height - _screen.height;

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		if (i >= 0) height -= i;

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   279

		if (height > 0) DoSetViewportPosition(w + 1, left, top, width, height);

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	}

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}

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ViewPort *IsPtInWindowViewport(const Window *w, int x, int y)

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{

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	ViewPort *vp = w->viewport;

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   288

	if (vp != NULL &&

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	    IS_INT_INSIDE(x, vp->left, vp->left + vp->width) &&

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			IS_INT_INSIDE(y, vp->top, vp->top + vp->height))

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		return vp;

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	return NULL;

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}

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static Point TranslateXYToTileCoord(const ViewPort *vp, int x, int y)

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{

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	Point pt;

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	int a,b;

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	uint z;

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   302

	if ( (uint)(x -= vp->left) >= (uint)vp->width ||

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				(uint)(y -= vp->top) >= (uint)vp->height) {

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				Point pt = {-1, -1};

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				return pt;

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	}

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   308

	x = ((x << vp->zoom) + vp->virtual_left) >> 2;

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	y = ((y << vp->zoom) + vp->virtual_top) >> 1;

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   311

#if !defined(NEW_ROTATION)

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	a = y-x;

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	b = y+x;

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#else

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	a = x+y;

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	b = x-y;

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#endif

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   319

	/* we need to move variables in to the valid range, as the

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	 * GetTileZoomCenterWindow() function can call here with invalid x and/or y,

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	 * when the user tries to zoom out along the sides of the map */

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	a = clamp(a, 0, (int)(MapMaxX() * TILE_SIZE) - 1);

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	b = clamp(b, 0, (int)(MapMaxY() * TILE_SIZE) - 1);

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	z = GetSlopeZ(a,     b    ) / 2;

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	z = GetSlopeZ(a + z, b + z) / 2;

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	z = GetSlopeZ(a + z, b + z) / 2;

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	z = GetSlopeZ(a + z, b + z) / 2;

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	z = GetSlopeZ(a + z, b + z) / 2;

   330

   331

	pt.x = a + z;

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	pt.y = b + z;

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   334

	return pt;

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}

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/* When used for zooming, check area below current coordinates (x,y)

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 * and return the tile of the zoomed out/in position (zoom_x, zoom_y)

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 * when you just want the tile, make x = zoom_x and y = zoom_y */

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static Point GetTileFromScreenXY(int x, int y, int zoom_x, int zoom_y)

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{

   342

	Window *w;

   343

	ViewPort *vp;

   344

	Point pt;

   345

   346

	if ( (w = FindWindowFromPt(x, y)) != NULL &&

   347

			 (vp = IsPtInWindowViewport(w, x, y)) != NULL)

   348

				return TranslateXYToTileCoord(vp, zoom_x, zoom_y);

   349

   350

	pt.y = pt.x = -1;

   351

	return pt;

   352

}

   353

   354

Point GetTileBelowCursor(void)

   355

{

   356

	return GetTileFromScreenXY(_cursor.pos.x, _cursor.pos.y, _cursor.pos.x, _cursor.pos.y);

   357

}

   358

   359

   360

Point GetTileZoomCenterWindow(bool in, Window * w)

   361

{

   362

	int x, y;

   363

	ViewPort * vp;

   364

   365

	vp = w->viewport;

   366

   367

	if (in) {

   368

		x = ((_cursor.pos.x - vp->left) >> 1) + (vp->width >> 2);

   369

		y = ((_cursor.pos.y - vp->top) >> 1) + (vp->height >> 2);

   370

	} else {

   371

		x = vp->width - (_cursor.pos.x - vp->left);

   372

		y = vp->height - (_cursor.pos.y - vp->top);

   373

	}

   374

	/* Get the tile below the cursor and center on the zoomed-out center */

   375

	return GetTileFromScreenXY(_cursor.pos.x, _cursor.pos.y, x + vp->left, y + vp->top);

   376

}

   377

   393

void DrawGroundSpriteAt(uint32 image, int32 x, int32 y, byte z)

   394

{

   395

	ViewportDrawer *vd = _cur_vd;

   396

	TileSpriteToDraw *ts;

   397

   398

	assert((image & SPRITE_MASK) < MAX_SPRITES);

   399

   400

	if (vd->spritelist_mem >= vd->eof_spritelist_mem) {

   401

		DEBUG(misc, 0) ("Out of sprite mem");

   402

		return;

   403

	}

   404

	ts = (TileSpriteToDraw*)vd->spritelist_mem;

   405

   406

	vd->spritelist_mem += sizeof(TileSpriteToDraw);

   407

   408

	ts->image = image;

   409

	ts->next = NULL;

   410

	ts->x = x;

   411

	ts->y = y;

   412

	ts->z = z;

   413

	*vd->last_tile = ts;

   414

	vd->last_tile = &ts->next;

   415

}

   416

   417

void DrawGroundSprite(uint32 image)

   418

{

   419

	if (_offset_ground_sprites) {

   420

		// offset ground sprite because of foundation?

   421

		AddChildSpriteScreen(image, _cur_vd->offs_x, _cur_vd->offs_y);

   422

	} else {

   423

		_added_tile_sprite = true;

   424

		DrawGroundSpriteAt(image, _cur_ti->x, _cur_ti->y, _cur_ti->z);

   425

	}

   426

}

   427

   428

   429

void OffsetGroundSprite(int x, int y)

   430

{

   431

	_cur_vd->offs_x = x;

   432

	_cur_vd->offs_y = y;

   433

	_offset_ground_sprites = true;

   434

}

   435

   436

static void AddCombinedSprite(uint32 image, int x, int y, byte z)

   437

{

   438

	const ViewportDrawer *vd = _cur_vd;

   439

	Point pt = RemapCoords(x, y, z);

   440

	const Sprite* spr = GetSprite(image & SPRITE_MASK);

   441

   442

	if (pt.x + spr->x_offs >= vd->dpi.left + vd->dpi.width ||

   443

			pt.x + spr->x_offs + spr->width <= vd->dpi.left ||

   444

			pt.y + spr->y_offs >= vd->dpi.top + vd->dpi.height ||

   445

			pt.y + spr->y_offs + spr->height <= vd->dpi.top)

   446

		return;

   447

   448

	AddChildSpriteScreen(image, pt.x - vd->parent_list[-1]->left, pt.y - vd->parent_list[-1]->top);

   449

}

   450

   451

   452

void AddSortableSpriteToDraw(uint32 image, int x, int y, int w, int h, byte dz, byte z)

   453

{

   454

	ViewportDrawer *vd = _cur_vd;

   455

	ParentSpriteToDraw *ps;

   456

	const Sprite *spr;

   457

	Point pt;

   458

   459

	assert((image & SPRITE_MASK) < MAX_SPRITES);

   460

   461

	if (vd->combine_sprites == 2) {

   462

		AddCombinedSprite(image, x, y, z);

   463

		return;

   464

	}

   465

   466

	vd->last_child = NULL;

   467

   468

	if (vd->spritelist_mem >= vd->eof_spritelist_mem) {

   469

		DEBUG(misc, 0) ("Out of sprite mem");

   470

		return;

   471

	}

   472

	ps = (ParentSpriteToDraw*)vd->spritelist_mem;

   473

   474

	if (vd->parent_list >= vd->eof_parent_list) {

   475

		// This can happen rarely, mostly when you zoom out completely

   476

		//  and have a lot of stuff that moves (and is added to the

   477

		//  sort-list, this function). To solve it, increase

   478

		//  parent_list somewhere below to a higher number.

   479

		// This can not really hurt you, it just gives some black

   480

		//  spots on the screen ;)

   481

		DEBUG(misc, 0) ("Out of sprite mem (parent_list)");

   482

		return;

   483

	}

   484

   485

	pt = RemapCoords(x, y, z);

   486

	spr = GetSprite(image & SPRITE_MASK);

   487

	if ((ps->left   = (pt.x += spr->x_offs)) >= vd->dpi.left + vd->dpi.width ||

   488

			(ps->right  = (pt.x +  spr->width )) <= vd->dpi.left ||

   489

			(ps->top    = (pt.y += spr->y_offs)) >= vd->dpi.top + vd->dpi.height ||

   490

			(ps->bottom = (pt.y +  spr->height)) <= vd->dpi.top) {

   491

		return;

   492

	}

   493

   494

	vd->spritelist_mem += sizeof(ParentSpriteToDraw);

   495

   496

	ps->image = image;

   497

	ps->xmin = x;

   498

	ps->xmax = x + w - 1;

   499

   500

	ps->ymin = y;

   501

	ps->ymax = y + h - 1;

   502

   503

	ps->zmin = z;

   504

	ps->zmax = z + dz - 1;

   505

   506

	ps->unk16 = 0;