author | Tero Marttila <terom@fixme.fi> |
Fri, 18 Jul 2008 21:59:53 +0300 | |
changeset 11176 | 874f8008e6e5 |
parent 10775 | 7061477bfbcf |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file heightmap.cpp Creating of maps from heightmaps. */ |
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#include "stdafx.h" |
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#include "openttd.h" |
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#include "variables.h" |
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#include "heightmap.h" |
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#include "clear_map.h" |
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#include "void_map.h" |
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#include "debug.h" |
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#include "gui.h" |
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#include "saveload.h" |
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#include "bmp.h" |
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#include "gfx_func.h" |
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#include "core/alloc_func.hpp" |
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#include "fios.h" |
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#include "settings_type.h" |
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#include "table/strings.h" |
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/** |
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* Convert RGB colors to Grayscale using 29.9% Red, 58.7% Green, 11.4% Blue |
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* (average luminosity formula) -- Dalestan |
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* This in fact is the NTSC Color Space -- TrueLight |
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*/ |
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static inline byte RGBToGrayscale(byte red, byte green, byte blue) |
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{ |
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/* 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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#ifdef WITH_PNG |
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#include <png.h> |
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/** |
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* The PNG Heightmap loader. |
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*/ |
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static void ReadHeightmapPNGImageData(byte *map, png_structp png_ptr, png_infop info_ptr) |
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{ |
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uint x, y; |
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byte gray_palette[256]; |
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png_bytep *row_pointers = NULL; |
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/* Get palette and convert it to grayscale */ |
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if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { |
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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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} |
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/** |
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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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*/ |
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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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row_pointers = png_get_rows(png_ptr, info_ptr); |
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/* Read the raw image data and convert in 8-bit grayscale */ |
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for (x = 0; x < info_ptr->width; x++) { |
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for (y = 0; y < info_ptr->height; y++) { |
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byte *pixel = &map[y * info_ptr->width + x]; |
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uint x_offset = x * info_ptr->channels; |
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if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { |
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*pixel = gray_palette[row_pointers[y][x_offset]]; |
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} 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 { |
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*pixel = row_pointers[y][x_offset]; |
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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 PNG file. |
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* If map == NULL only the size of the PNG is read, otherwise a map |
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* with grayscale pixels is allocated and assigned to *map. |
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*/ |
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static bool ReadHeightmapPNG(char *filename, uint *x, uint *y, byte **map) |
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{ |
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FILE *fp; |
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png_structp png_ptr = NULL; |
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png_infop info_ptr = NULL; |
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fp = fopen(filename, "rb"); |
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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; |
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} |
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png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
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if (png_ptr == NULL) { |
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ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0); |
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fclose(fp); |
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115 |
return false; |
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116 |
} |
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117 |
|
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118 |
info_ptr = png_create_info_struct(png_ptr); |
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if (info_ptr == NULL || setjmp(png_jmpbuf(png_ptr))) { |
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ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0); |
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121 |
fclose(fp); |
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122 |
png_destroy_read_struct(&png_ptr, &info_ptr, NULL); |
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123 |
return false; |
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124 |
} |
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125 |
|
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126 |
png_init_io(png_ptr, fp); |
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127 |
|
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128 |
/* Allocate memory and read image, without alpha or 16-bit samples |
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* (result is either 8-bit indexed/grayscale or 24-bit RGB) */ |
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png_set_packing(png_ptr); |
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png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_PACKING | PNG_TRANSFORM_STRIP_ALPHA | PNG_TRANSFORM_STRIP_16, NULL); |
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132 |
|
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133 |
/* Maps of wrong color-depth are not used. |
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* (this should have been taken care of by stripping alpha and 16-bit samples on load) */ |
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if ((info_ptr->channels != 1) && (info_ptr->channels != 3) && (info_ptr->bit_depth != 8)) { |
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|
136 |
ShowErrorMessage(STR_PNGMAP_ERR_IMAGE_TYPE, STR_PNGMAP_ERROR, 0, 0); |
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fclose(fp); |
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|
138 |
png_destroy_read_struct(&png_ptr, &info_ptr, NULL); |
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|
139 |
return false; |
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140 |
} |
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141 |
|
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142 |
if (map != NULL) { |
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*map = MallocT<byte>(info_ptr->width * info_ptr->height); |
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144 |
|
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145 |
if (*map == NULL) { |
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146 |
ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0); |
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147 |
fclose(fp); |
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|
148 |
png_destroy_read_struct(&png_ptr, &info_ptr, NULL); |
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|
149 |
return false; |
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150 |
} |
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151 |
|
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152 |
ReadHeightmapPNGImageData(*map, png_ptr, info_ptr); |
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153 |
} |
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154 |
|
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155 |
*x = info_ptr->width; |
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*y = info_ptr->height; |
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|
157 |
|
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158 |
fclose(fp); |
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|
159 |
png_destroy_read_struct(&png_ptr, &info_ptr, NULL); |
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|
160 |
return true; |
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161 |
} |
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162 |
|
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163 |
#endif /* WITH_PNG */ |
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164 |
|
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165 |
|
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166 |
/** |
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* The BMP Heightmap loader. |
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*/ |
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static void ReadHeightmapBMPImageData(byte *map, BmpInfo *info, BmpData *data) |
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{ |
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171 |
uint x, y; |
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byte gray_palette[256]; |
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173 |
|
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174 |
if (data->palette != NULL) { |
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uint i; |
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bool all_gray = true; |
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177 |
|
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178 |
if (info->palette_size != 2) { |
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179 |
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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182 |
} |
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183 |
|
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184 |
/** |
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185 |
* For a non-gray palette of size 16 we assume that |
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186 |
* the order of the palette determines the height; |
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187 |
* the first entry is the sea (level 0), the second one |
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188 |
* level 1, etc. |
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189 |
*/ |
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190 |
if (info->palette_size == 16 && !all_gray) { |
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|
191 |
for (i = 0; i < info->palette_size; i++) { |
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192 |
gray_palette[i] = 256 * i / info->palette_size; |
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193 |
} |
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194 |
} |
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195 |
} else { |
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196 |
/** |
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197 |
* For a palette of size 2 we assume that the order of the palette determines the height; |
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198 |
* the first entry is the sea (level 0), the second one is the land (level 1) |
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199 |
*/ |
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200 |
gray_palette[0] = 0; |
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201 |
gray_palette[1] = 16; |
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202 |
} |
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203 |
} |
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204 |
|
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205 |
/* Read the raw image data and convert in 8-bit grayscale */ |
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206 |
for (y = 0; y < info->height; y++) { |
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207 |
byte *pixel = &map[y * info->width]; |
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byte *bitmap = &data->bitmap[y * info->width * (info->bpp == 24 ? 3 : 1)]; |
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209 |
|
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210 |
for (x = 0; x < info->width; x++) { |
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211 |
if (info->bpp != 24) { |
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212 |
*pixel++ = gray_palette[*bitmap++]; |
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213 |
} else { |
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*pixel++ = RGBToGrayscale(*bitmap, *(bitmap + 1), *(bitmap + 2)); |
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215 |
bitmap += 3; |
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216 |
} |
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217 |
} |
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218 |
} |
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219 |
} |
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220 |
|
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221 |
/** |
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222 |
* Reads the heightmap and/or size of the heightmap from a BMP file. |
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223 |
* If map == NULL only the size of the BMP is read, otherwise a map |
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224 |
* with grayscale pixels is allocated and assigned to *map. |
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225 |
*/ |
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226 |
static bool ReadHeightmapBMP(char *filename, uint *x, uint *y, byte **map) |
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{ |
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228 |
FILE *f; |
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BmpInfo info; |
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230 |
BmpData data; |
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231 |
BmpBuffer buffer; |
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232 |
|
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233 |
/* Init BmpData */ |
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234 |
memset(&data, 0, sizeof(data)); |
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235 |
|
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f = fopen(filename, "rb"); |
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237 |
if (f == NULL) { |
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238 |
ShowErrorMessage(STR_PNGMAP_ERR_FILE_NOT_FOUND, STR_BMPMAP_ERROR, 0, 0); |
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|
239 |
return false; |
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240 |
} |
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|
241 |
|
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242 |
BmpInitializeBuffer(&buffer, f); |
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|
243 |
|
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244 |
if (!BmpReadHeader(&buffer, &info, &data)) { |
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245 |
ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0); |
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|
246 |
fclose(f); |
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|
247 |
BmpDestroyData(&data); |
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|
248 |
return false; |
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|
249 |
} |
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|
250 |
|
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251 |
if (map != NULL) { |
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252 |
if (!BmpReadBitmap(&buffer, &info, &data)) { |
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253 |
ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0); |
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|
254 |
fclose(f); |
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|
255 |
BmpDestroyData(&data); |
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|
256 |
return false; |
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|
257 |
} |
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|
258 |
|
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|
259 |
*map = MallocT<byte>(info.width * info.height); |
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if (*map == NULL) { |
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|
261 |
ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_BMPMAP_ERROR, 0, 0); |
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|
262 |
fclose(f); |
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|
263 |
BmpDestroyData(&data); |
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|
264 |
return false; |
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|
265 |
} |
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|
266 |
|
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|
267 |
ReadHeightmapBMPImageData(*map, &info, &data); |
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|
268 |
|
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|
269 |
} |
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|
270 |
|
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271 |
BmpDestroyData(&data); |
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|
272 |
|
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273 |
*x = info.width; |
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|
274 |
*y = info.height; |
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|
275 |
|
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|
276 |
fclose(f); |
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|
277 |
return true; |
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|
278 |
} |
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|
279 |
|
7036
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|
280 |
/** |
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|
281 |
* Converts a given grayscale map to something that fits in OTTD map system |
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282 |
* and create a map of that data. |
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283 |
* @param img_width the with of the image in pixels/tiles |
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284 |
* @param img_height the height of the image in pixels/tiles |
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285 |
* @param map the input map |
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|
286 |
*/ |
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287 |
static void GrayscaleToMapHeights(uint img_width, uint img_height, byte *map) |
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288 |
{ |
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|
289 |
/* Defines the detail of the aspect ratio (to avoid doubles) */ |
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|
290 |
const uint num_div = 16384; |
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|
291 |
|
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292 |
uint width, height; |
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293 |
uint row, col; |
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|
294 |
uint row_pad = 0, col_pad = 0; |
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|
295 |
uint img_scale; |
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|
296 |
uint img_row, img_col; |
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|
297 |
TileIndex tile; |
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|
298 |
|
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|
299 |
/* Get map size and calculate scale and padding values */ |
10775
7061477bfbcf
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|
300 |
switch (_settings_game.game_creation.heightmap_rotation) { |
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|
301 |
default: NOT_REACHED(); |
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|
302 |
case HM_COUNTER_CLOCKWISE: |
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|
303 |
width = MapSizeX(); |
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|
304 |
height = MapSizeY(); |
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|
305 |
break; |
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|
306 |
case HM_CLOCKWISE: |
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|
307 |
width = MapSizeY(); |
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|
308 |
height = MapSizeX(); |
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|
309 |
break; |
4300
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|
310 |
} |
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|
311 |
|
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|
312 |
if ((img_width * num_div) / img_height > ((width * num_div) / height)) { |
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|
313 |
/* Image is wider than map - center vertically */ |
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|
314 |
img_scale = (width * num_div) / img_width; |
5867
724600f8ae0d
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rubidium
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|
315 |
row_pad = (1 + height - ((img_height * img_scale) / num_div)) / 2; |
4300
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|
316 |
} else { |
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|
317 |
/* Image is taller than map - center horizontally */ |
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|
318 |
img_scale = (height * num_div) / img_height; |
5867
724600f8ae0d
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|
319 |
col_pad = (1 + width - ((img_width * img_scale) / num_div)) / 2; |
4300
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|
320 |
} |
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|
321 |
|
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|
322 |
/* Form the landscape */ |
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|
323 |
for (row = 0; row < height - 1; row++) { |
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|
324 |
for (col = 0; col < width - 1; col++) { |
10775
7061477bfbcf
(svn r13325) -Codechange: split the client-side only settings from the settings stored in the savegame so there is no need to have a duplicate copy of it for new games.
rubidium
parents:
10703
diff
changeset
|
325 |
switch (_settings_game.game_creation.heightmap_rotation) { |
5869
33d51b7f639d
(svn r8077) -Cleanup: Restructure some switch() statements' default case when they're unreachable
Darkvater
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5867
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changeset
|
326 |
default: NOT_REACHED(); |
33d51b7f639d
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Darkvater
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|
327 |
case HM_COUNTER_CLOCKWISE: tile = TileXY(col, row); break; |
33d51b7f639d
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|
328 |
case HM_CLOCKWISE: tile = TileXY(row, col); break; |
4300
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|
329 |
} |
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|
330 |
|
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|
331 |
/* Check if current tile is within the 1-pixel map edge or padding regions */ |
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|
332 |
if ((DistanceFromEdge(tile) <= 1) || |
5867
724600f8ae0d
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rubidium
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5864
diff
changeset
|
333 |
(row < row_pad) || (row >= (height - row_pad - 1)) || |
724600f8ae0d
(svn r8074) -Fix (FS#537, r7555, r5749): revert r7555 because it was really wrong and fix the off-by-one error due to truncation that was supposedly fixed by r7555.
rubidium
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5864
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|
334 |
(col < col_pad) || (col >= (width - col_pad - 1))) { |
4300
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|
335 |
SetTileHeight(tile, 0); |
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|
336 |
} else { |
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|
337 |
/* Use nearest neighbor resizing to scale map data. |
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changeset
|
338 |
* We rotate the map 45 degrees (counter)clockwise */ |
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changeset
|
339 |
img_row = (((row - row_pad) * num_div) / img_scale); |
10775
7061477bfbcf
(svn r13325) -Codechange: split the client-side only settings from the settings stored in the savegame so there is no need to have a duplicate copy of it for new games.
rubidium
parents:
10703
diff
changeset
|
340 |
switch (_settings_game.game_creation.heightmap_rotation) { |
5869
33d51b7f639d
(svn r8077) -Cleanup: Restructure some switch() statements' default case when they're unreachable
Darkvater
parents:
5867
diff
changeset
|
341 |
default: NOT_REACHED(); |
33d51b7f639d
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Darkvater
parents:
5867
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changeset
|
342 |
case HM_COUNTER_CLOCKWISE: |
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diff
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|
343 |
img_col = (((width - 1 - col - col_pad) * num_div) / img_scale); |
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|
344 |
break; |
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|
345 |
case HM_CLOCKWISE: |
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diff
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|
346 |
img_col = (((col - col_pad) * num_div) / img_scale); |
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|
347 |
break; |
4300
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|
348 |
} |
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|
349 |
|
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|
350 |
assert(img_row < img_height); |
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|
351 |
assert(img_col < img_width); |
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|
352 |
|
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|
353 |
/* Color scales from 0 to 255, OpenTTD height scales from 0 to 15 */ |
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|
354 |
SetTileHeight(tile, map[img_row * img_width + img_col] / 16); |
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|
355 |
} |
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|
356 |
MakeClear(tile, CLEAR_GRASS, 3); |
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|
357 |
} |
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|
358 |
} |
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|
359 |
} |
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|
360 |
|
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|
361 |
/** |
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|
362 |
* This function takes care of the fact that land in OpenTTD can never differ |
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363 |
* more than 1 in height |
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364 |
*/ |
6573 | 365 |
static void FixSlopes() |
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366 |
{ |
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367 |
uint width, height; |
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368 |
uint row, col; |
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369 |
byte current_tile; |
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|
370 |
|
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|
371 |
/* Adjust height difference to maximum one horizontal/vertical change. */ |
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|
372 |
width = MapSizeX(); |
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|
373 |
height = MapSizeY(); |
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|
374 |
|
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|
375 |
/* Top and left edge */ |
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|
376 |
for (row = 1; row < height - 2; row++) { |
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|
377 |
for (col = 1; col < width - 2; col++) { |
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|
378 |
/* Find lowest tile; either the top or left one */ |
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|
379 |
current_tile = TileHeight(TileXY(col - 1, row)); // top edge |
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|
380 |
if (TileHeight(TileXY(col, row - 1)) < current_tile) { |
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|
381 |
current_tile = TileHeight(TileXY(col, row - 1)); // left edge |
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|
382 |
} |
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|
383 |
|
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|
384 |
/* Does the height differ more than one? */ |
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|
385 |
if (TileHeight(TileXY(col, row)) >= (uint)current_tile + 2) { |
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|
386 |
/* Then change the height to be no more than one */ |
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|
387 |
SetTileHeight(TileXY(col, row), current_tile + 1); |
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|
388 |
} |
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|
389 |
} |
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|
390 |
} |
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|
391 |
|
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|
392 |
/* Bottom and right edge */ |
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|
393 |
for (row = height - 2; row > 0; row--) { |
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|
394 |
for (col = width - 2; col > 0; col--) { |
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|
395 |
/* Find lowest tile; either the bottom and right one */ |
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|
396 |
current_tile = TileHeight(TileXY(col + 1, row)); // bottom edge |
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|
397 |
if (TileHeight(TileXY(col, row + 1)) < current_tile) { |
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|
398 |
current_tile = TileHeight(TileXY(col, row + 1)); // right edge |
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|
399 |
} |
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|
400 |
|
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changeset
|
401 |
/* Does the height differ more than one? */ |
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|
402 |
if (TileHeight(TileXY(col, row)) >= (uint)current_tile + 2) { |
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|
403 |
/* Then change the height to be no more than one */ |
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|
404 |
SetTileHeight(TileXY(col, row), current_tile + 1); |
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|
405 |
} |
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changeset
|
406 |
} |
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|
407 |
} |
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|
408 |
} |
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|
409 |
|
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|
410 |
/** |
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|
411 |
* Reads the heightmap with the correct file reader |
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|
412 |
*/ |
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|
413 |
static bool ReadHeightMap(char *filename, uint *x, uint *y, byte **map) |
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|
414 |
{ |
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|
415 |
switch (_file_to_saveload.mode) { |
5869
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|
416 |
default: NOT_REACHED(); |
4300
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|
417 |
#ifdef WITH_PNG |
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|
418 |
case SL_PNG: |
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|
419 |
return ReadHeightmapPNG(filename, x, y, map); |
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|
420 |
#endif /* WITH_PNG */ |
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|
421 |
case SL_BMP: |
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|
422 |
return ReadHeightmapBMP(filename, x, y, map); |
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|
423 |
} |
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|
424 |
} |
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|
425 |
|
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|
426 |
bool GetHeightmapDimensions(char *filename, uint *x, uint *y) |
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|
427 |
{ |
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|
428 |
return ReadHeightMap(filename, x, y, NULL); |
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|
429 |
} |
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|
430 |
|
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|
431 |
void LoadHeightmap(char *filename) |
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|
432 |
{ |
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|
433 |
uint x, y; |
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|
434 |
byte *map = NULL; |
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|
435 |
|
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|
436 |
if (!ReadHeightMap(filename, &x, &y, &map)) { |
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|
437 |
free(map); |
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|
438 |
return; |
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|
439 |
} |
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|
440 |
|
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|
441 |
GrayscaleToMapHeights(x, y, map); |
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|
442 |
free(map); |
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changeset
|
443 |
|
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|
444 |
FixSlopes(); |
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|
445 |
MarkWholeScreenDirty(); |
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|
446 |
} |
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|
447 |
|
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|
448 |
void FlatEmptyWorld(byte tile_height) |
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|
449 |
{ |
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|
450 |
uint width, height; |
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|
451 |
uint row, col; |
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|
452 |
|
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|
453 |
width = MapSizeX(); |
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|
454 |
height = MapSizeY(); |
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|
455 |
|
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|
456 |
for (row = 2; row < height - 2; row++) { |
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|
457 |
for (col = 2; col < width - 2; col++) { |
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|
458 |
SetTileHeight(TileXY(col, row), tile_height); |
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|
459 |
} |
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|
460 |
} |
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changeset
|
461 |
|
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truelight
parents:
diff
changeset
|
462 |
FixSlopes(); |
687a17c9c557
(svn r5946) -Add: merged the TGP branch to mainline. TGP adds:
truelight
parents:
diff
changeset
|
463 |
MarkWholeScreenDirty(); |
687a17c9c557
(svn r5946) -Add: merged the TGP branch to mainline. TGP adds:
truelight
parents:
diff
changeset
|
464 |
} |