/* $Id$ */ /** @file heightmap.cpp */ #include "stdafx.h" #include "openttd.h" #include "variables.h" #include "functions.h" #include "heightmap.h" #include "clear_map.h" #include "table/strings.h" #include "void_map.h" #include "debug.h" #include "gfx.h" #include "gui.h" #include "saveload.h" #include "bmp.h" #include "helpers.hpp" /** * Convert RGB colors to Grayscale using 29.9% Red, 58.7% Green, 11.4% Blue * (average luminosity formula) -- Dalestan * This in fact is the NTSC Color Space -- TrueLight */ static inline byte RGBToGrayscale(byte red, byte green, byte blue) { /* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then * divide by it to normalize the value to a byte again. */ return ((red * 19595) + (green * 38470) + (blue * 7471)) / 65536; } #ifdef WITH_PNG #include <png.h> /** * The PNG Heightmap loader. */ static void ReadHeightmapPNGImageData(byte *map, png_structp png_ptr, png_infop info_ptr) { uint x, y; byte gray_palette[256]; png_bytep *row_pointers = NULL; /* Get palette and convert it to grayscale */ if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { int i; int palette_size; png_color *palette; bool all_gray = true; png_get_PLTE(png_ptr, info_ptr, &palette, &palette_size); for (i = 0; i < palette_size && (palette_size != 16 || all_gray); i++) { all_gray &= palette[i].red == palette[i].green && palette[i].red == palette[i].blue; gray_palette[i] = RGBToGrayscale(palette[i].red, palette[i].green, palette[i].blue); } /** * For a non-gray palette of size 16 we assume that * the order of the palette determines the height; * the first entry is the sea (level 0), the second one * level 1, etc. */ if (palette_size == 16 && !all_gray) { for (i = 0; i < palette_size; i++) { gray_palette[i] = 256 * i / palette_size; } } } row_pointers = png_get_rows(png_ptr, info_ptr); /* Read the raw image data and convert in 8-bit grayscale */ for (x = 0; x < info_ptr->width; x++) { for (y = 0; y < info_ptr->height; y++) { byte *pixel = &map[y * info_ptr->width + x]; uint x_offset = x * info_ptr->channels; if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { *pixel = gray_palette[row_pointers[y][x_offset]]; } else if (info_ptr->channels == 3) { *pixel = RGBToGrayscale(row_pointers[y][x_offset + 0], row_pointers[y][x_offset + 1], row_pointers[y][x_offset + 2]); } else { *pixel = row_pointers[y][x_offset]; } } } } /** * Reads the heightmap and/or size of the heightmap from a PNG file. * If map == NULL only the size of the PNG is read, otherwise a map * with grayscale pixels is allocated and assigned to *map. */ static bool ReadHeightmapPNG(char *filename, uint *x, uint *y, byte **map) { FILE *fp; png_structp png_ptr = NULL; png_infop info_ptr = NULL; fp = fopen(filename, "rb"); if (fp == NULL) { ShowErrorMessage(STR_PNGMAP_ERR_FILE_NOT_FOUND, STR_PNGMAP_ERROR, 0, 0); return false; } png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); if (png_ptr == NULL) { ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0); fclose(fp); return false; } info_ptr = png_create_info_struct(png_ptr); if (info_ptr == NULL || setjmp(png_jmpbuf(png_ptr))) { ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0); fclose(fp); png_destroy_read_struct(&png_ptr, &info_ptr, NULL); return false; } png_init_io(png_ptr, fp); /* Allocate memory and read image, without alpha or 16-bit samples * (result is either 8-bit indexed/grayscale or 24-bit RGB) */ png_set_packing(png_ptr); png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_PACKING | PNG_TRANSFORM_STRIP_ALPHA | PNG_TRANSFORM_STRIP_16, NULL); /* Maps of wrong color-depth are not used. * (this should have been taken care of by stripping alpha and 16-bit samples on load) */ if ((info_ptr->channels != 1) && (info_ptr->channels != 3) && (info_ptr->bit_depth != 8)) { ShowErrorMessage(STR_PNGMAP_ERR_IMAGE_TYPE, STR_PNGMAP_ERROR, 0, 0); fclose(fp); png_destroy_read_struct(&png_ptr, &info_ptr, NULL); return false; } if (map != NULL) { *map = MallocT<byte>(info_ptr->width * info_ptr->height); if (*map == NULL) { ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0); fclose(fp); png_destroy_read_struct(&png_ptr, &info_ptr, NULL); return false; } ReadHeightmapPNGImageData(*map, png_ptr, info_ptr); } *x = info_ptr->width; *y = info_ptr->height; fclose(fp); png_destroy_read_struct(&png_ptr, &info_ptr, NULL); return true; } #endif /* WITH_PNG */ /** * The BMP Heightmap loader. */ static void ReadHeightmapBMPImageData(byte *map, BmpInfo *info, BmpData *data) { uint x, y; byte gray_palette[256]; if (data->palette != NULL) { uint i; bool all_gray = true; if (info->palette_size != 2) { for (i = 0; i < info->palette_size && (info->palette_size != 16 || all_gray); i++) { all_gray &= data->palette[i].r == data->palette[i].g && data->palette[i].r == data->palette[i].b; gray_palette[i] = RGBToGrayscale(data->palette[i].r, data->palette[i].g, data->palette[i].b); } /** * For a non-gray palette of size 16 we assume that * the order of the palette determines the height; * the first entry is the sea (level 0), the second one * level 1, etc. */ if (info->palette_size == 16 && !all_gray) { for (i = 0; i < info->palette_size; i++) { gray_palette[i] = 256 * i / info->palette_size; } } } else { /** * For a palette of size 2 we assume that the order of the palette determines the height; * the first entry is the sea (level 0), the second one is the land (level 1) */ gray_palette[0] = 0; gray_palette[1] = 16; } } /* Read the raw image data and convert in 8-bit grayscale */ for (y = 0; y < info->height; y++) { byte *pixel = &map[y * info->width]; byte *bitmap = &data->bitmap[y * info->width * (info->bpp == 24 ? 3 : 1)]; for (x = 0; x < info->width; x++) { if (info->bpp != 24) { *pixel++ = gray_palette[*bitmap++]; } else { *pixel++ = RGBToGrayscale(*bitmap, *(bitmap + 1), *(bitmap + 2)); bitmap += 3; } } } } /** * Reads the heightmap and/or size of the heightmap from a BMP file. * If map == NULL only the size of the BMP is read, otherwise a map * with grayscale pixels is allocated and assigned to *map. */ static bool ReadHeightmapBMP(char *filename, uint *x, uint *y, byte **map) { FILE *f; BmpInfo info; BmpData data; BmpBuffer buffer; /* Init BmpData */ memset(&data, 0, sizeof(data)); f = fopen(filename, "rb"); if (f == NULL) { ShowErrorMessage(STR_PNGMAP_ERR_FILE_NOT_FOUND, STR_BMPMAP_ERROR, 0, 0); return false; } BmpInitializeBuffer(&buffer, f); if (!BmpReadHeader(&buffer, &info, &data)) { ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0); fclose(f); BmpDestroyData(&data); return false; } if (map != NULL) { if (!BmpReadBitmap(&buffer, &info, &data)) { ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0); fclose(f); BmpDestroyData(&data); return false; } *map = MallocT<byte>(info.width * info.height); if (*map == NULL) { ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_BMPMAP_ERROR, 0, 0); fclose(f); BmpDestroyData(&data); return false; } ReadHeightmapBMPImageData(*map, &info, &data); } BmpDestroyData(&data); *x = info.width; *y = info.height; fclose(f); return true; } static void GrayscaleToMapHeights(uint img_width, uint img_height, byte *map) { /* Defines the detail of the aspect ratio (to avoid doubles) */ const uint num_div = 16384; uint width, height; uint row, col; uint row_pad = 0, col_pad = 0; uint img_scale; uint img_row, img_col; TileIndex tile; /* Get map size and calculate scale and padding values */ switch (_patches.heightmap_rotation) { default: NOT_REACHED(); case HM_COUNTER_CLOCKWISE: width = MapSizeX(); height = MapSizeY(); break; case HM_CLOCKWISE: width = MapSizeY(); height = MapSizeX(); break; } if ((img_width * num_div) / img_height > ((width * num_div) / height)) { /* Image is wider than map - center vertically */ img_scale = (width * num_div) / img_width; row_pad = (1 + height - ((img_height * img_scale) / num_div)) / 2; } else { /* Image is taller than map - center horizontally */ img_scale = (height * num_div) / img_height; col_pad = (1 + width - ((img_width * img_scale) / num_div)) / 2; } /* Form the landscape */ for (row = 0; row < height - 1; row++) { for (col = 0; col < width - 1; col++) { switch (_patches.heightmap_rotation) { default: NOT_REACHED(); case HM_COUNTER_CLOCKWISE: tile = TileXY(col, row); break; case HM_CLOCKWISE: tile = TileXY(row, col); break; } /* Check if current tile is within the 1-pixel map edge or padding regions */ if ((DistanceFromEdge(tile) <= 1) || (row < row_pad) || (row >= (height - row_pad - 1)) || (col < col_pad) || (col >= (width - col_pad - 1))) { SetTileHeight(tile, 0); } else { /* Use nearest neighbor resizing to scale map data. * We rotate the map 45 degrees (counter)clockwise */ img_row = (((row - row_pad) * num_div) / img_scale); switch (_patches.heightmap_rotation) { default: NOT_REACHED(); case HM_COUNTER_CLOCKWISE: img_col = (((width - 1 - col - col_pad) * num_div) / img_scale); break; case HM_CLOCKWISE: img_col = (((col - col_pad) * num_div) / img_scale); break; } assert(img_row < img_height); assert(img_col < img_width); /* Color scales from 0 to 255, OpenTTD height scales from 0 to 15 */ SetTileHeight(tile, map[img_row * img_width + img_col] / 16); } MakeClear(tile, CLEAR_GRASS, 3); } } } /** * This function takes care of the fact that land in OpenTTD can never differ * more than 1 in height */ static void FixSlopes() { uint width, height; uint row, col; byte current_tile; /* Adjust height difference to maximum one horizontal/vertical change. */ width = MapSizeX(); height = MapSizeY(); /* Top and left edge */ for (row = 1; row < height - 2; row++) { for (col = 1; col < width - 2; col++) { /* Find lowest tile; either the top or left one */ current_tile = TileHeight(TileXY(col - 1, row)); // top edge if (TileHeight(TileXY(col, row - 1)) < current_tile) { current_tile = TileHeight(TileXY(col, row - 1)); // left edge } /* Does the height differ more than one? */ if (TileHeight(TileXY(col, row)) >= (uint)current_tile + 2) { /* Then change the height to be no more than one */ SetTileHeight(TileXY(col, row), current_tile + 1); } } } /* Bottom and right edge */ for (row = height - 2; row > 0; row--) { for (col = width - 2; col > 0; col--) { /* Find lowest tile; either the bottom and right one */ current_tile = TileHeight(TileXY(col + 1, row)); // bottom edge if (TileHeight(TileXY(col, row + 1)) < current_tile) { current_tile = TileHeight(TileXY(col, row + 1)); // right edge } /* Does the height differ more than one? */ if (TileHeight(TileXY(col, row)) >= (uint)current_tile + 2) { /* Then change the height to be no more than one */ SetTileHeight(TileXY(col, row), current_tile + 1); } } } } /** * Reads the heightmap with the correct file reader */ static bool ReadHeightMap(char *filename, uint *x, uint *y, byte **map) { switch (_file_to_saveload.mode) { default: NOT_REACHED(); #ifdef WITH_PNG case SL_PNG: return ReadHeightmapPNG(filename, x, y, map); #endif /* WITH_PNG */ case SL_BMP: return ReadHeightmapBMP(filename, x, y, map); } } bool GetHeightmapDimensions(char *filename, uint *x, uint *y) { return ReadHeightMap(filename, x, y, NULL); } void LoadHeightmap(char *filename) { uint x, y; byte *map = NULL; if (!ReadHeightMap(filename, &x, &y, &map)) { free(map); return; } GrayscaleToMapHeights(x, y, map); free(map); FixSlopes(); MarkWholeScreenDirty(); } void FlatEmptyWorld(byte tile_height) { uint width, height; uint row, col; width = MapSizeX(); height = MapSizeY(); for (row = 2; row < height - 2; row++) { for (col = 2; col < width - 2; col++) { SetTileHeight(TileXY(col, row), tile_height); } } FixSlopes(); MarkWholeScreenDirty(); }