1

/* $Id$ */

     2

     3

#include "stdafx.h"

     4

#include "openttd.h"

     5

#include "variables.h"

     6

#include "functions.h"

     7

#include "heightmap.h"

     8

#include "clear_map.h"

     9

#include "table/strings.h"

    10

#include "void_map.h"

    11

#include "debug.h"

    12

#include "gfx.h"

    13

#include "gui.h"

    14

#include "saveload.h"

    15

#include "bmp.h"

    17

    18

/**

    19

 * Convert RGB colors to Grayscale using 29.9% Red, 58.7% Green, 11.4% Blue

    20

 *  (average luminosity formula) -- Dalestan

    21

 * This in fact is the NTSC Color Space -- TrueLight

    22

 */

    23

static inline byte RGBToGrayscale(byte red, byte green, byte blue)

    24

{

    25

	/* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then

    26

	 *  divide by it to normalize the value to a byte again. */

    27

	return ((red * 19595) + (green * 38470) + (blue * 7471)) / 65536;

    28

}

    29

    30

    31

#ifdef WITH_PNG

    32

    33

#include "png.h"

    34

    35

/**

    36

 * The PNG Heightmap loader.

    37

 */

    38

static void ReadHeightmapPNGImageData(byte *map, png_structp png_ptr, png_infop info_ptr)

    39

{

    40

	uint x, y;

    41

	byte gray_palette[256];

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	png_bytep *row_pointers = NULL;

    43

    44

	/* Get palette and convert it to grayscale */

    45

	if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) {

    46

		int i;

    47

		int palette_size;

    48

		png_color *palette;

    49

		bool all_gray = true;

    50

    51

		png_get_PLTE(png_ptr, info_ptr, &palette, &palette_size);

    52

		for (i = 0; i < palette_size && (palette_size != 16 || all_gray); i++) {

    53

			all_gray &= palette[i].red == palette[i].green && palette[i].red == palette[i].blue;

    54

			gray_palette[i] = RGBToGrayscale(palette[i].red, palette[i].green, palette[i].blue);

    55

		}

    56

    57

		/**

    58

		 * For a non-gray palette of size 16 we assume that

    59

		 * the order of the palette determines the height;

    60

		 * the first entry is the sea (level 0), the second one

    61

		 * level 1, etc.

    62

		 */

    63

		if (palette_size == 16 && !all_gray) {

    64

			for (i = 0; i < palette_size; i++) {

    65

				gray_palette[i] = 256 * i / palette_size;

    66

			}

    67

		}

    68

	}

    69

    70

	row_pointers = png_get_rows(png_ptr, info_ptr);

    71

    72

	/* Read the raw image data and convert in 8-bit grayscale */

    73

	for (x = 0; x < info_ptr->width; x++) {

    74

		for (y = 0; y < info_ptr->height; y++) {

    75

			byte *pixel = &map[y * info_ptr->width + x];

    76

			uint x_offset = x * info_ptr->channels;

    77

    78

			if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) {

    79

				*pixel = gray_palette[row_pointers[y][x_offset]];

    80

			} else if (info_ptr->channels == 3) {

    81

				*pixel = RGBToGrayscale(row_pointers[y][x_offset + 0],

    82

						row_pointers[y][x_offset + 1], row_pointers[y][x_offset + 2]);

    83

			} else {

    84

				*pixel = row_pointers[y][x_offset];

    85

			}

    86

		}

    87

	}

    88

}

    89

    90

/**

    91

 * Reads the heightmap and/or size of the heightmap from a PNG file.

    92

 * If map == NULL only the size of the PNG is read, otherwise a map

    93

 * with grayscale pixels is allocated and assigned to *map.

    94

 */

    95

static bool ReadHeightmapPNG(char *filename, uint *x, uint *y, byte **map)

    96

{

    97

	FILE *fp;

    98

	png_structp png_ptr = NULL;

    99

	png_infop info_ptr  = NULL;

   100

   101

	fp = fopen(filename, "rb");

   102

	if (fp == NULL) {

   103

		ShowErrorMessage(STR_PNGMAP_ERR_FILE_NOT_FOUND, STR_PNGMAP_ERROR, 0, 0);

   104

		return false;

   105

	}

   106

   107

	png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);

   108

	if (png_ptr == NULL) {

   109

		ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0);

   110

		fclose(fp);

   111

		return false;

   112

	}

   113

   114

	info_ptr = png_create_info_struct(png_ptr);

   115

	if (info_ptr == NULL || setjmp(png_jmpbuf(png_ptr))) {

   116

		ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0);

   117

		fclose(fp);

   118

		png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

   119

		return false;

   120

	}

   121

   122

	png_init_io(png_ptr, fp);

   123

   124

	/* Allocate memory and read image, without alpha or 16-bit samples

   125

	 * (result is either 8-bit indexed/grayscale or 24-bit RGB) */

   126

	png_set_packing(png_ptr);

   127

	png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_PACKING | PNG_TRANSFORM_STRIP_ALPHA | PNG_TRANSFORM_STRIP_16, NULL);

   128

   129

	/* Maps of wrong color-depth are not used.

   130

	 * (this should have been taken care of by stripping alpha and 16-bit samples on load) */

   131

	if ((info_ptr->channels != 1) && (info_ptr->channels != 3) && (info_ptr->bit_depth != 8)) {

   132

		ShowErrorMessage(STR_PNGMAP_ERR_IMAGE_TYPE, STR_PNGMAP_ERROR, 0, 0);

   133

		fclose(fp);

   134

		png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

   135

		return false;

   136

	}

   137

   138

	if (map != NULL) {

   140

   141

		if (*map == NULL) {

   142

			ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0);

   143

			fclose(fp);

   144

			png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

   145

			return false;

   146

		}

   147

   148

		ReadHeightmapPNGImageData(*map, png_ptr, info_ptr);

   149

	}

   150

   151

	*x = info_ptr->width;

   152

	*y = info_ptr->height;

   153

   154

	fclose(fp);

   155

	png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

   156

	return true;

   157

}

   158

   159

#endif /* WITH_PNG */

   160

   161

   162

/**

   163

 * The BMP Heightmap loader.

   164

 */

   165

static void ReadHeightmapBMPImageData(byte *map, BmpInfo *info, BmpData *data)

   166

{

   167

	uint x, y;

   168

	byte gray_palette[256];

   169

   170

	if (data->palette != NULL) {

   171

		uint i;

   172

		bool all_gray = true;

   173

   174

		if (info->palette_size != 2) {

   175

			for (i = 0; i < info->palette_size && (info->palette_size != 16 || all_gray); i++) {

   176

				all_gray &= data->palette[i].r == data->palette[i].g && data->palette[i].r == data->palette[i].b;

   177

				gray_palette[i] = RGBToGrayscale(data->palette[i].r, data->palette[i].g, data->palette[i].b);

   178

			}

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   180

			/**

   181

			 * For a non-gray palette of size 16 we assume that

   182

			 * the order of the palette determines the height;

   183

			 * the first entry is the sea (level 0), the second one

   184

			 * level 1, etc.

   185

			 */

   186

			if (info->palette_size == 16 && !all_gray) {

   187

				for (i = 0; i < info->palette_size; i++) {

   188

					gray_palette[i] = 256 * i / info->palette_size;

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				}

   190

			}

   191

		} else {

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			/**

   193

			 * For a palette of size 2 we assume that the order of the palette determines the height;

   194

			 * the first entry is the sea (level 0), the second one is the land (level 1)

   195

			 */

   196

			gray_palette[0] = 0;

   197

			gray_palette[1] = 16;

   198

		}

   199

	}

   200

   201

	/* Read the raw image data and convert in 8-bit grayscale */

   202

	for (y = 0; y < info->height; y++) {

   203

		byte *pixel = &map[y * info->width];

   204

		byte *bitmap = &data->bitmap[y * info->width * (info->bpp == 24 ? 3 : 1)];

   205

   206

		for (x = 0; x < info->width; x++) {

   207

			if (info->bpp != 24) {

   208

				*pixel++ = gray_palette[*bitmap++];

   209

			} else {

   210

				*pixel++ = RGBToGrayscale(*bitmap, *(bitmap + 1), *(bitmap + 2));

   211

				bitmap += 3;

   212

			}

   213

		}

   214

	}

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}

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   217

/**

   218

 * Reads the heightmap and/or size of the heightmap from a BMP file.

   219

 * If map == NULL only the size of the BMP is read, otherwise a map

   220

 * with grayscale pixels is allocated and assigned to *map.

   221

 */

   222

static bool ReadHeightmapBMP(char *filename, uint *x, uint *y, byte **map)

   223

{

   224

	FILE *f;

   225

	BmpInfo info;

   226

	BmpData data;

   227

	BmpBuffer buffer;

   228

   229

	f = fopen(filename, "rb");

   230

	if (f == NULL) {

   231

		ShowErrorMessage(STR_PNGMAP_ERR_FILE_NOT_FOUND, STR_BMPMAP_ERROR, 0, 0);

   232

		return false;

   233

	}

   234

   235

	BmpInitializeBuffer(&buffer, f);

   236

   237

	if (!BmpReadHeader(&buffer, &info, &data)) {

   238

		ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0);

   239

		fclose(f);

   240

		BmpDestroyData(&data);

   241

		return false;

   242

	}

   243

   244

	if (map != NULL) {

   245

		if (!BmpReadBitmap(&buffer, &info, &data)) {

   246

			ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0);

   247

			fclose(f);

   248

			BmpDestroyData(&data);

   249

			return false;

   250

		}

   251

   253

		if (*map == NULL) {

   254

			ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_BMPMAP_ERROR, 0, 0);

   255

			fclose(f);

   256

			BmpDestroyData(&data);

   257

			return false;

   258

		}

   259

   260

		ReadHeightmapBMPImageData(*map, &info, &data);

   261

   262

	}

   263

   264

	BmpDestroyData(&data);

   265

   266

	*x = info.width;

   267

	*y = info.height;

   268

   269

	fclose(f);

   270

	return true;

   271

}

   272

   273

static void GrayscaleToMapHeights(uint img_width, uint img_height, byte *map)

   274

{

   275

	/* Defines the detail of the aspect ratio (to avoid doubles) */

   276

	const uint num_div = 16384;

   277

   278

	uint width, height;

   279

	uint row, col;

   280

	uint row_pad = 0, col_pad = 0;

   281

	uint img_scale;

   282

	uint img_row, img_col;

   283

	TileIndex tile;

   284

   285

	/* Get map size and calculate scale and padding values */

   286

	switch (_patches.heightmap_rotation) {

   287

	case HM_COUNTER_CLOCKWISE:

   288

		width   = MapSizeX();

   289

		height  = MapSizeY();

   290

		break;

   291

	case HM_CLOCKWISE:

   292

		width   = MapSizeY();

   293

		height  = MapSizeX();

   294

		break;

   295

	default:

   296

		NOT_REACHED();

   297

		/* Avoids compiler warnings */

   298

		return;

   299

	}

   300

   301

	if ((img_width * num_div) / img_height > ((width * num_div) / height)) {

   302

		/* Image is wider than map - center vertically */

   303

		img_scale = (width * num_div) / img_width;

   304

		row_pad = (height - ((img_height * img_scale) / num_div)) / 2;

   305

	} else {

   306

		/* Image is taller than map - center horizontally */

   307

		img_scale = (height * num_div) / img_height;

   308

		col_pad = (width - ((img_width * img_scale) / num_div)) / 2;

   309

	}

   310

   311

	/* Form the landscape */

   312

	for (row = 0; row < height - 1; row++) {

   313

		for (col = 0; col < width - 1; col++) {

   314

			switch (_patches.heightmap_rotation) {

   315

			case HM_COUNTER_CLOCKWISE: tile = TileXY(col, row); break;

   316

			case HM_CLOCKWISE:         tile = TileXY(row, col); break;

   317

			default:                   NOT_REACHED(); return;

   318

			}

   319

   320

			/* Check if current tile is within the 1-pixel map edge or padding regions */

   321

			if ((DistanceFromEdge(tile) <= 1) ||

   322

					(row < row_pad) || (row >= (img_height + row_pad)) ||

   323

					(col < col_pad) || (col >= (img_width  + col_pad))) {

   324

				SetTileHeight(tile, 0);

   325

			} else {

   326

				/* Use nearest neighbor resizing to scale map data.

   327

				 *  We rotate the map 45 degrees (counter)clockwise */

   328

				img_row = (((row - row_pad) * num_div) / img_scale);

   329

				switch (_patches.heightmap_rotation) {

   330

				case HM_COUNTER_CLOCKWISE:

   331

					img_col = (((width - 1 - col - col_pad) * num_div) / img_scale);

   332

					break;

   333

				case HM_CLOCKWISE:

   334

					img_col = (((col - col_pad) * num_div) / img_scale);

   335

					break;

   336

				default:

   337

					NOT_REACHED();

   338

					/* Avoids compiler warnings */

   339

					return;

   340

				}

   341

   342

				assert(img_row < img_height);

   343

				assert(img_col < img_width);

   344

   345

				/* Color scales from 0 to 255, OpenTTD height scales from 0 to 15 */

   346

				SetTileHeight(tile, map[img_row * img_width + img_col] / 16);

   347

			}

   348

			MakeClear(tile, CLEAR_GRASS, 3);

   349

		}

   350

	}

   351

}

   352

   353

/**

   354

 * This function takes care of the fact that land in OpenTTD can never differ

   355

 * more than 1 in height

   356

 */

   357

static void FixSlopes(void)

   358

{

   359

	uint width, height;

   360

	uint row, col;

   361

	byte current_tile;

   362

   363

	/* Adjust height difference to maximum one horizontal/vertical change. */

   364

	width   = MapSizeX();

   365

	height  = MapSizeY();

   366

   367

	/* Top and left edge */

   368

	for (row = 1; row < height - 2; row++) {

   369

		for (col = 1; col < width - 2; col++) {

   370

			/* Find lowest tile; either the top or left one */

   371

			current_tile = TileHeight(TileXY(col - 1, row)); // top edge

   372

			if (TileHeight(TileXY(col, row - 1)) < current_tile) {

   373

				current_tile = TileHeight(TileXY(col, row - 1)); // left edge

   374

			}

   375

   376

			/* Does the height differ more than one? */

   377

			if (TileHeight(TileXY(col, row)) >= (uint)current_tile + 2) {

   378

				/* Then change the height to be no more than one */

   379

				SetTileHeight(TileXY(col, row), current_tile + 1);

   380

			}

   381

		}

   382

	}

   383

   384

	/* Bottom and right edge */

   385

	for (row = height - 2; row > 0; row--) {

   386

		for (col = width - 2; col > 0; col--) {

   387

			/* Find lowest tile; either the bottom and right one */

   388

			current_tile = TileHeight(TileXY(col + 1, row)); // bottom edge

   389

			if (TileHeight(TileXY(col, row + 1)) < current_tile) {

   390

				current_tile = TileHeight(TileXY(col, row + 1)); // right edge

   391

			}

   392

   393

			/* Does the height differ more than one? */

   394

			if (TileHeight(TileXY(col, row)) >= (uint)current_tile + 2) {

   395

				/* Then change the height to be no more than one */

   396

				SetTileHeight(TileXY(col, row), current_tile + 1);

   397

			}

   398

		}

   399

	}

   400

}

   401

   402

/**

   403

 * Reads the heightmap with the correct file reader

   404

 */

   405

static bool ReadHeightMap(char *filename, uint *x, uint *y, byte **map)

   406

{

   407

	switch (_file_to_saveload.mode) {

   408

#ifdef WITH_PNG

   409

		case SL_PNG:

   410

			return ReadHeightmapPNG(filename, x, y, map);

   411

#endif /* WITH_PNG */

   412

		case SL_BMP:

   413

			return ReadHeightmapBMP(filename, x, y, map);

   414

   415

		default:

   416

			NOT_REACHED();

   417

			/* Avoids compiler warnings */

   418

			return false;

   419

	}

   420

}

   421

   422

bool GetHeightmapDimensions(char *filename, uint *x, uint *y)

   423

{

   424

	return ReadHeightMap(filename, x, y, NULL);

   425

}

   426

   427

void LoadHeightmap(char *filename)

   428

{

   429

	uint x, y;

   430

	byte *map = NULL;

   431

   432

	if (!ReadHeightMap(filename, &x, &y, &map)) {

   433

		free(map);

   434

		return;

   435

	}

   436

   437

	GrayscaleToMapHeights(x, y, map);

   438

	free(map);

   439

   440

	FixSlopes();

   441

	MarkWholeScreenDirty();

   442

}

   443

   444

void FlatEmptyWorld(byte tile_height)

   445

{

   446

	uint width, height;

   447

	uint row, col;

   448

   449

	width  = MapSizeX();

   450

	height = MapSizeY();

   451

   452

	for (row = 2; row < height - 2; row++) {

   453

		for (col = 2; col < width - 2; col++) {

   454

			SetTileHeight(TileXY(col, row), tile_height);

   455

		}

   456

	}

   457

   458

	FixSlopes();

   459

	MarkWholeScreenDirty();

   460

}