1

/* $Id$ */

     2

     3

/** @file heightmap.cpp */

     4

     5

#include "stdafx.h"

     6

#include "openttd.h"

     7

#include "variables.h"

     8

#include "functions.h"

     9

#include "heightmap.h"

    10

#include "clear_map.h"

    11

#include "table/strings.h"

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#include "void_map.h"

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#include "debug.h"

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#include "gfx.h"

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#include "gui.h"

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#include "saveload.h"

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#include "bmp.h"

    18

#include "helpers.hpp"

    19

    20

/**

    21

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

    22

 *  (average luminosity formula) -- Dalestan

    23

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

    24

 */

    25

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

    26

{

    27

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

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

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

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}

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    32

    33

#ifdef WITH_PNG

    34

    35

#include <png.h>

    36

    37

/**

    38

 * The PNG Heightmap loader.

    39

 */

    40

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

    41

{

    42

	uint x, y;

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	byte gray_palette[256];

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	png_bytep *row_pointers = NULL;

    45

    46

	/* Get palette and convert it to grayscale */

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	if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) {

    48

		int i;

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		int palette_size;

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		png_color *palette;

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		bool all_gray = true;

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

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

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

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

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		}

    58

    59

		/**

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

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		 * the order of the palette determines the height;

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

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		 * level 1, etc.

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		 */

    65

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

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

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				gray_palette[i] = 256 * i / palette_size;

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			}

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		}

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	}

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    72

	row_pointers = png_get_rows(png_ptr, info_ptr);

    73

    74

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

    75

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

    76

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

    77

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

    78

			uint x_offset = x * info_ptr->channels;

    79

    80

			if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) {

    81

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

    82

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

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

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

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			} else {

    86

				*pixel = row_pointers[y][x_offset];

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			}

    88

		}

    89

	}

    90

}

    91

    92

/**

    93

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

    94

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

    95

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

    96

 */

    97

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

    98

{

    99

	FILE *fp;

   100

	png_structp png_ptr = NULL;

   101

	png_infop info_ptr  = NULL;

   102

   103

	fp = fopen(filename, "rb");

   104

	if (fp == NULL) {

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		ShowErrorMessage(STR_PNGMAP_ERR_FILE_NOT_FOUND, STR_PNGMAP_ERROR, 0, 0);

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		return false;

   107

	}

   108

   109

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

   110

	if (png_ptr == NULL) {

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		ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0);

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		fclose(fp);

   113

		return false;

   114

	}

   115

   116

	info_ptr = png_create_info_struct(png_ptr);

   117

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

   118

		ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0);

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		fclose(fp);

   120

		png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

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		return false;

   122

	}

   123

   124

	png_init_io(png_ptr, fp);

   125

   126

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

   127

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

   128

	png_set_packing(png_ptr);

   129

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

   130

   131

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

   132

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

   133

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

   134

		ShowErrorMessage(STR_PNGMAP_ERR_IMAGE_TYPE, STR_PNGMAP_ERROR, 0, 0);

   135

		fclose(fp);

   136

		png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

   137

		return false;

   138

	}

   139

   140

	if (map != NULL) {

   141

		*map = MallocT<byte>(info_ptr->width * info_ptr->height);

   142

   143

		if (*map == NULL) {

   144

			ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0);

   145

			fclose(fp);

   146

			png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

   147

			return false;

   148

		}

   149

   150

		ReadHeightmapPNGImageData(*map, png_ptr, info_ptr);

   151

	}

   152

   153

	*x = info_ptr->width;

   154

	*y = info_ptr->height;

   155

   156

	fclose(fp);

   157

	png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

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	return true;

   159

}

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   161

#endif /* WITH_PNG */

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   163

   164

/**

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 * The BMP Heightmap loader.

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 */

   167

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

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{

   169

	uint x, y;

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	byte gray_palette[256];

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   172

	if (data->palette != NULL) {

   173

		uint i;

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		bool all_gray = true;

   175

   176

		if (info->palette_size != 2) {

   177

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

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

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

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			}

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   182

			/**

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

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			 * the order of the palette determines the height;

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

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			 * level 1, etc.

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			 */

   188

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

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

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

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				}

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			}

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		} else {

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			/**

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

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

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			 */

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			gray_palette[0] = 0;

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			gray_palette[1] = 16;

   200

		}

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	}

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   203

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

   204

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

   205

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

   206

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

   207

   208

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

   209

			if (info->bpp != 24) {

   210

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

   211

			} else {

   212

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

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				bitmap += 3;

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			}

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		}

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	}

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}

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/**

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

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

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

   223

 */

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

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{

   226

	FILE *f;

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	BmpInfo info;

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	BmpData data;

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	BmpBuffer buffer;

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   231

	/* Init BmpData */

   232

	memset(&data, 0, sizeof(data));

   233

   234

	f = fopen(filename, "rb");

   235

	if (f == NULL) {

   236

		ShowErrorMessage(STR_PNGMAP_ERR_FILE_NOT_FOUND, STR_BMPMAP_ERROR, 0, 0);

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		return false;

   238

	}

   239

   240

	BmpInitializeBuffer(&buffer, f);

   241

   242

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

   243

		ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0);

   244

		fclose(f);

   245

		BmpDestroyData(&data);

   246

		return false;

   247

	}

   248

   249

	if (map != NULL) {

   250

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

   251

			ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0);

   252

			fclose(f);

   253

			BmpDestroyData(&data);

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			return false;

   255

		}

   256

   257

		*map = MallocT<byte>(info.width * info.height);

   258

		if (*map == NULL) {

   259

			ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_BMPMAP_ERROR, 0, 0);

   260

			fclose(f);

   261

			BmpDestroyData(&data);

   262

			return false;

   263

		}

   264

   265

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

   266

   267

	}

   268

   269

	BmpDestroyData(&data);

   270

   271

	*x = info.width;

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	*y = info.height;

   273

   274

	fclose(f);

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	return true;

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}

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   278

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

   279

{

   280

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

   281

	const uint num_div = 16384;

   282

   283

	uint width, height;

   284

	uint row, col;

   285

	uint row_pad = 0, col_pad = 0;

   286

	uint img_scale;

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	uint img_row, img_col;

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	TileIndex tile;

   289

   290

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

   291

	switch (_patches.heightmap_rotation) {

   292

		default: NOT_REACHED();

   293

		case HM_COUNTER_CLOCKWISE:

   294

			width   = MapSizeX();

   295

			height  = MapSizeY();

   296

			break;

   297

		case HM_CLOCKWISE:

   298

			width   = MapSizeY();

   299

			height  = MapSizeX();

   300

			break;

   301

	}

   302

   303

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

   304

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

   305

		img_scale = (width * num_div) / img_width;

   306

		row_pad = (1 + height - ((img_height * img_scale) / num_div)) / 2;

   307

	} else {

   308

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

   309

		img_scale = (height * num_div) / img_height;

   310

		col_pad = (1 + width - ((img_width * img_scale) / num_div)) / 2;

   311

	}

   312

   313

	/* Form the landscape */

   314

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

   315

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

   316

			switch (_patches.heightmap_rotation) {

   317

				default: NOT_REACHED();

   318

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

   319

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

   320

			}

   321

   322

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

   323

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

   324

					(row < row_pad) || (row >= (height - row_pad - 1)) ||

   325

					(col < col_pad) || (col >= (width  - col_pad - 1))) {

   326

				SetTileHeight(tile, 0);

   327

			} else {

   328

				/* Use nearest neighbor resizing to scale map data.

   329

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

   330

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

   331

				switch (_patches.heightmap_rotation) {

   332

					default: NOT_REACHED();

   333

					case HM_COUNTER_CLOCKWISE:

   334

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

   335

						break;

   336

					case HM_CLOCKWISE:

   337

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

   338

						break;

   339

				}

   340

   341

				assert(img_row < img_height);

   342

				assert(img_col < img_width);

   343

   344

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

   345

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

   346

			}

   347

			MakeClear(tile, CLEAR_GRASS, 3);

   348

		}

   349

	}

   350

}

   351

   352

/**

   353

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

   354

 * more than 1 in height

   355

 */

   356

static void FixSlopes()

   357

{

   358

	uint width, height;

   359

	uint row, col;

   360

	byte current_tile;

   361

   362

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

   363

	width   = MapSizeX();

   364

	height  = MapSizeY();

   365

   366

	/* Top and left edge */

   367

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

   368

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

   369

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

   370

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

   371

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

   372

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

   373

			}

   374

   375

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

   376

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

   377

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

   378

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

   379

			}

   380

		}

   381

	}

   382

   383

	/* Bottom and right edge */

   384

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

   385

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

   386

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

   387

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

   388

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

   389

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

   390

			}

   391

   392

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

   393

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

   394

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

   395

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

   396

			}

   397

		}

   398

	}

   399

}

   400

   401

/**

   402

 * Reads the heightmap with the correct file reader

   403

 */

   404

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

   405

{

   406

	switch (_file_to_saveload.mode) {

   407

		default: NOT_REACHED();

   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

}

   416

   417

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

   418

{

   419

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

   420

}

   421

   422

void LoadHeightmap(char *filename)

   423

{

   424

	uint x, y;

   425

	byte *map = NULL;

   426

   427

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

   428

		free(map);

   429

		return;

   430

	}

   431

   432

	GrayscaleToMapHeights(x, y, map);

   433

	free(map);

   434

   435

	FixSlopes();

   436

	MarkWholeScreenDirty();

   437

}

   438

   439

void FlatEmptyWorld(byte tile_height)

   440

{

   441

	uint width, height;

   442

	uint row, col;

   443

   444

	width  = MapSizeX();

   445

	height = MapSizeY();

   446

   447

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

   448

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

   449

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

   450

		}

   451

	}

   452

   453

	FixSlopes();

   454

	MarkWholeScreenDirty();

   455

}