author | KUDr |
Sun, 31 Dec 2006 02:53:23 +0000 | |
branch | custombridgeheads |
changeset 5611 | 11da6bafbfb9 |
parent 5558 | 6bb52a5060a8 |
child 5411 | ff8773876e0a |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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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 "functions.h" |
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#include "heightmap.h" |
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#include "clear_map.h" |
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#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" |
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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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return false; |
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} |
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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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fclose(fp); |
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL); |
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118 |
return false; |
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119 |
} |
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120 |
|
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121 |
png_init_io(png_ptr, fp); |
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122 |
|
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123 |
/* 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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127 |
|
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128 |
/* 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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ShowErrorMessage(STR_PNGMAP_ERR_IMAGE_TYPE, STR_PNGMAP_ERROR, 0, 0); |
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132 |
fclose(fp); |
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133 |
png_destroy_read_struct(&png_ptr, &info_ptr, NULL); |
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|
134 |
return false; |
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135 |
} |
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136 |
|
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137 |
if (map != NULL) { |
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*map = malloc(info_ptr->width * info_ptr->height * sizeof(byte)); |
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139 |
|
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140 |
if (*map == NULL) { |
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141 |
ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0); |
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fclose(fp); |
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143 |
png_destroy_read_struct(&png_ptr, &info_ptr, NULL); |
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|
144 |
return false; |
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145 |
} |
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146 |
|
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ReadHeightmapPNGImageData(*map, png_ptr, info_ptr); |
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148 |
} |
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149 |
|
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*x = info_ptr->width; |
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*y = info_ptr->height; |
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152 |
|
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153 |
fclose(fp); |
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154 |
png_destroy_read_struct(&png_ptr, &info_ptr, NULL); |
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|
155 |
return true; |
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156 |
} |
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157 |
|
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158 |
#endif /* WITH_PNG */ |
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159 |
|
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160 |
|
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161 |
/** |
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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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166 |
uint x, y; |
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byte gray_palette[256]; |
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168 |
|
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169 |
if (data->palette != NULL) { |
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uint i; |
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bool all_gray = true; |
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172 |
|
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if (info->palette_size != 2) { |
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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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177 |
} |
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178 |
|
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179 |
/** |
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* For a non-gray palette of size 16 we assume that |
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181 |
* 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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184 |
*/ |
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185 |
if (info->palette_size == 16 && !all_gray) { |
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186 |
for (i = 0; i < info->palette_size; i++) { |
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187 |
gray_palette[i] = 256 * i / info->palette_size; |
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188 |
} |
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189 |
} |
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190 |
} else { |
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191 |
/** |
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192 |
* For a palette of size 2 we assume that the order of the palette determines the height; |
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193 |
* the first entry is the sea (level 0), the second one is the land (level 1) |
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194 |
*/ |
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195 |
gray_palette[0] = 0; |
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196 |
gray_palette[1] = 16; |
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197 |
} |
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198 |
} |
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199 |
|
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200 |
/* Read the raw image data and convert in 8-bit grayscale */ |
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201 |
for (y = 0; y < info->height; y++) { |
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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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204 |
|
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205 |
for (x = 0; x < info->width; x++) { |
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206 |
if (info->bpp != 24) { |
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207 |
*pixel++ = gray_palette[*bitmap++]; |
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208 |
} else { |
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*pixel++ = RGBToGrayscale(*bitmap, *(bitmap + 1), *(bitmap + 2)); |
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210 |
bitmap += 3; |
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211 |
} |
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212 |
} |
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213 |
} |
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214 |
} |
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215 |
|
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216 |
/** |
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217 |
* 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. |
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220 |
*/ |
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221 |
static bool ReadHeightmapBMP(char *filename, uint *x, uint *y, byte **map) |
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{ |
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223 |
FILE *f; |
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BmpInfo info; |
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225 |
BmpData data; |
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226 |
BmpBuffer buffer; |
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227 |
|
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f = fopen(filename, "rb"); |
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229 |
if (f == NULL) { |
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ShowErrorMessage(STR_PNGMAP_ERR_FILE_NOT_FOUND, STR_BMPMAP_ERROR, 0, 0); |
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|
231 |
return false; |
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|
232 |
} |
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changeset
|
233 |
|
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|
234 |
BmpInitializeBuffer(&buffer, f); |
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|
235 |
|
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|
236 |
if (!BmpReadHeader(&buffer, &info, &data)) { |
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|
237 |
ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0); |
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|
238 |
fclose(f); |
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|
239 |
BmpDestroyData(&data); |
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|
240 |
return false; |
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parents:
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|
241 |
} |
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|
242 |
|
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|
243 |
if (map != NULL) { |
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|
244 |
if (!BmpReadBitmap(&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 |
*map = malloc(info.width * info.height * sizeof(byte)); |
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|
252 |
if (*map == NULL) { |
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|
253 |
ShowErrorMessage(STR_PNGMAP_ERR_MISC, 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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changeset
|
258 |
|
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|
259 |
ReadHeightmapBMPImageData(*map, &info, &data); |
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|
260 |
|
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|
261 |
} |
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changeset
|
262 |
|
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|
263 |
BmpDestroyData(&data); |
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changeset
|
264 |
|
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|
265 |
*x = info.width; |
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|
266 |
*y = info.height; |
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|
267 |
|
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|
268 |
fclose(f); |
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|
269 |
return true; |
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|
270 |
} |
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|
271 |
|
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|
272 |
static void GrayscaleToMapHeights(uint img_width, uint img_height, byte *map) |
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273 |
{ |
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|
274 |
/* Defines the detail of the aspect ratio (to avoid doubles) */ |
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|
275 |
const uint num_div = 16384; |
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changeset
|
276 |
|
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|
277 |
uint width, height; |
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|
278 |
uint row, col; |
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|
279 |
uint row_pad = 0, col_pad = 0; |
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|
280 |
uint img_scale; |
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|
281 |
uint img_row, img_col; |
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|
282 |
TileIndex tile; |
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changeset
|
283 |
|
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changeset
|
284 |
/* Get map size and calculate scale and padding values */ |
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changeset
|
285 |
switch (_patches.heightmap_rotation) { |
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diff
changeset
|
286 |
case HM_COUNTER_CLOCKWISE: |
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diff
changeset
|
287 |
width = MapSizeX(); |
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|
288 |
height = MapSizeY(); |
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changeset
|
289 |
break; |
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changeset
|
290 |
case HM_CLOCKWISE: |
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|
291 |
width = MapSizeY(); |
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changeset
|
292 |
height = MapSizeX(); |
687a17c9c557
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changeset
|
293 |
break; |
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diff
changeset
|
294 |
default: |
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changeset
|
295 |
NOT_REACHED(); |
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changeset
|
296 |
/* Avoids compiler warnings */ |
687a17c9c557
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diff
changeset
|
297 |
return; |
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diff
changeset
|
298 |
} |
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changeset
|
299 |
|
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changeset
|
300 |
if ((img_width * num_div) / img_height > ((width * num_div) / height)) { |
687a17c9c557
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changeset
|
301 |
/* Image is wider than map - center vertically */ |
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changeset
|
302 |
img_scale = (width * num_div) / img_width; |
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changeset
|
303 |
row_pad = (height - ((img_height * img_scale) / num_div)) / 2; |
687a17c9c557
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changeset
|
304 |
} else { |
687a17c9c557
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parents:
diff
changeset
|
305 |
/* Image is taller than map - center horizontally */ |
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parents:
diff
changeset
|
306 |
img_scale = (height * num_div) / img_height; |
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diff
changeset
|
307 |
col_pad = (width - ((img_width * img_scale) / num_div)) / 2; |
687a17c9c557
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diff
changeset
|
308 |
} |
687a17c9c557
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parents:
diff
changeset
|
309 |
|
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changeset
|
310 |
/* Form the landscape */ |
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changeset
|
311 |
for (row = 0; row < height - 1; row++) { |
687a17c9c557
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changeset
|
312 |
for (col = 0; col < width - 1; col++) { |
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changeset
|
313 |
switch (_patches.heightmap_rotation) { |
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changeset
|
314 |
case HM_COUNTER_CLOCKWISE: tile = TileXY(col, row); break; |
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diff
changeset
|
315 |
case HM_CLOCKWISE: tile = TileXY(row, col); break; |
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changeset
|
316 |
default: NOT_REACHED(); return; |
687a17c9c557
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diff
changeset
|
317 |
} |
687a17c9c557
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changeset
|
318 |
|
687a17c9c557
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parents:
diff
changeset
|
319 |
/* Check if current tile is within the 1-pixel map edge or padding regions */ |
687a17c9c557
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parents:
diff
changeset
|
320 |
if ((DistanceFromEdge(tile) <= 1) || |
5558
6bb52a5060a8
(svn r7555) -Fix (r5479): off-by-one error due do truncation on division by 2. Thanks to Ben_Robbins_ for providing the test case.
rubidium
parents:
4549
diff
changeset
|
321 |
(row < row_pad) || (row >= (img_height + row_pad)) || |
6bb52a5060a8
(svn r7555) -Fix (r5479): off-by-one error due do truncation on division by 2. Thanks to Ben_Robbins_ for providing the test case.
rubidium
parents:
4549
diff
changeset
|
322 |
(col < col_pad) || (col >= (img_width + col_pad))) { |
4300
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diff
changeset
|
323 |
SetTileHeight(tile, 0); |
687a17c9c557
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diff
changeset
|
324 |
} else { |
687a17c9c557
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parents:
diff
changeset
|
325 |
/* Use nearest neighbor resizing to scale map data. |
687a17c9c557
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parents:
diff
changeset
|
326 |
* We rotate the map 45 degrees (counter)clockwise */ |
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diff
changeset
|
327 |
img_row = (((row - row_pad) * num_div) / img_scale); |
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parents:
diff
changeset
|
328 |
switch (_patches.heightmap_rotation) { |
687a17c9c557
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parents:
diff
changeset
|
329 |
case HM_COUNTER_CLOCKWISE: |
687a17c9c557
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parents:
diff
changeset
|
330 |
img_col = (((width - 1 - col - col_pad) * num_div) / img_scale); |
687a17c9c557
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parents:
diff
changeset
|
331 |
break; |
687a17c9c557
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truelight
parents:
diff
changeset
|
332 |
case HM_CLOCKWISE: |
687a17c9c557
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parents:
diff
changeset
|
333 |
img_col = (((col - col_pad) * num_div) / img_scale); |
687a17c9c557
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truelight
parents:
diff
changeset
|
334 |
break; |
687a17c9c557
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truelight
parents:
diff
changeset
|
335 |
default: |
687a17c9c557
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parents:
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changeset
|
336 |
NOT_REACHED(); |
687a17c9c557
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parents:
diff
changeset
|
337 |
/* Avoids compiler warnings */ |
687a17c9c557
(svn r5946) -Add: merged the TGP branch to mainline. TGP adds:
truelight
parents:
diff
changeset
|
338 |
return; |
687a17c9c557
(svn r5946) -Add: merged the TGP branch to mainline. TGP adds:
truelight
parents:
diff
changeset
|
339 |
} |
687a17c9c557
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truelight
parents:
diff
changeset
|
340 |
|
687a17c9c557
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truelight
parents:
diff
changeset
|
341 |
assert(img_row < img_height); |
687a17c9c557
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truelight
parents:
diff
changeset
|
342 |
assert(img_col < img_width); |
687a17c9c557
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truelight
parents:
diff
changeset
|
343 |
|
687a17c9c557
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parents:
diff
changeset
|
344 |
/* Color scales from 0 to 255, OpenTTD height scales from 0 to 15 */ |
687a17c9c557
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parents:
diff
changeset
|
345 |
SetTileHeight(tile, map[img_row * img_width + img_col] / 16); |
687a17c9c557
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parents:
diff
changeset
|
346 |
} |
687a17c9c557
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parents:
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changeset
|
347 |
MakeClear(tile, CLEAR_GRASS, 3); |
687a17c9c557
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parents:
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changeset
|
348 |
} |
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349 |
} |
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350 |
} |
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351 |
|
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/** |
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* This function takes care of the fact that land in OpenTTD can never differ |
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* more than 1 in height |
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355 |
*/ |
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static void FixSlopes(void) |
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{ |
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358 |
uint width, height; |
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359 |
uint row, col; |
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360 |
byte current_tile; |
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361 |
|
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362 |
/* Adjust height difference to maximum one horizontal/vertical change. */ |
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width = MapSizeX(); |
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364 |
height = MapSizeY(); |
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365 |
|
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366 |
/* Top and left edge */ |
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367 |
for (row = 1; row < height - 2; row++) { |
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368 |
for (col = 1; col < width - 2; col++) { |
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369 |
/* Find lowest tile; either the top or left one */ |
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370 |
current_tile = TileHeight(TileXY(col - 1, row)); // top edge |
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371 |
if (TileHeight(TileXY(col, row - 1)) < current_tile) { |
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372 |
current_tile = TileHeight(TileXY(col, row - 1)); // left edge |
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373 |
} |
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374 |
|
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375 |
/* Does the height differ more than one? */ |
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376 |
if (TileHeight(TileXY(col, row)) >= (uint)current_tile + 2) { |
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377 |
/* Then change the height to be no more than one */ |
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378 |
SetTileHeight(TileXY(col, row), current_tile + 1); |
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379 |
} |
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380 |
} |
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381 |
} |
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382 |
|
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383 |
/* Bottom and right edge */ |
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384 |
for (row = height - 2; row > 0; row--) { |
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385 |
for (col = width - 2; col > 0; col--) { |
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386 |
/* Find lowest tile; either the bottom and right one */ |
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387 |
current_tile = TileHeight(TileXY(col + 1, row)); // bottom edge |
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388 |
if (TileHeight(TileXY(col, row + 1)) < current_tile) { |
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389 |
current_tile = TileHeight(TileXY(col, row + 1)); // right edge |
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390 |
} |
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|
391 |
|
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|
392 |
/* Does the height differ more than one? */ |
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393 |
if (TileHeight(TileXY(col, row)) >= (uint)current_tile + 2) { |
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394 |
/* Then change the height to be no more than one */ |
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395 |
SetTileHeight(TileXY(col, row), current_tile + 1); |
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396 |
} |
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397 |
} |
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398 |
} |
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399 |
} |
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400 |
|
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401 |
/** |
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402 |
* Reads the heightmap with the correct file reader |
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403 |
*/ |
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404 |
static bool ReadHeightMap(char *filename, uint *x, uint *y, byte **map) |
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405 |
{ |
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406 |
switch (_file_to_saveload.mode) { |
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407 |
#ifdef WITH_PNG |
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408 |
case SL_PNG: |
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409 |
return ReadHeightmapPNG(filename, x, y, map); |
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410 |
#endif /* WITH_PNG */ |
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411 |
case SL_BMP: |
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412 |
return ReadHeightmapBMP(filename, x, y, map); |
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413 |
|
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414 |
default: |
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415 |
NOT_REACHED(); |
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416 |
/* Avoids compiler warnings */ |
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417 |
return false; |
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418 |
} |
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419 |
} |
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420 |
|
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421 |
bool GetHeightmapDimensions(char *filename, uint *x, uint *y) |
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422 |
{ |
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423 |
return ReadHeightMap(filename, x, y, NULL); |
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424 |
} |
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|
425 |
|
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426 |
void LoadHeightmap(char *filename) |
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427 |
{ |
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428 |
uint x, y; |
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429 |
byte *map = NULL; |
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|
430 |
|
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431 |
if (!ReadHeightMap(filename, &x, &y, &map)) { |
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432 |
free(map); |
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433 |
return; |
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434 |
} |
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|
435 |
|
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436 |
GrayscaleToMapHeights(x, y, map); |
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|
437 |
free(map); |
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|
438 |
|
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439 |
FixSlopes(); |
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440 |
MarkWholeScreenDirty(); |
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|
441 |
} |
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442 |
|
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443 |
void FlatEmptyWorld(byte tile_height) |
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444 |
{ |
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445 |
uint width, height; |
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446 |
uint row, col; |
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|
447 |
|
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448 |
width = MapSizeX(); |
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449 |
height = MapSizeY(); |
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|
450 |
|
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451 |
for (row = 2; row < height - 2; row++) { |
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452 |
for (col = 2; col < width - 2; col++) { |
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453 |
SetTileHeight(TileXY(col, row), tile_height); |
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454 |
} |
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455 |
} |
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|
456 |
|
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|
457 |
FixSlopes(); |
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|
458 |
MarkWholeScreenDirty(); |
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|
459 |
} |