RMTile.c
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//
// RMTile.c
//
// Copyright (c) 2008-2012, Route-Me Contributors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
#include "RMTile.h"
#import <math.h>
#import <stdio.h>
uint64_t RMTileHash(RMTile tile)
{
uint64_t accumulator = 0;
for (int i = 0; i < tile.zoom; i++)
{
accumulator |= ((uint64_t)tile.x & (1LL<<i)) << i;
accumulator |= ((uint64_t)tile.y & (1LL<<i)) << (i+1);
}
accumulator |= 1LL<<(tile.zoom * 2);
return accumulator;
}
uint64_t RMTileKey(RMTile tile)
{
uint64_t zoom = (uint64_t)tile.zoom & 0xFFLL; // 8bits, 256 levels
uint64_t x = (uint64_t)tile.x & 0xFFFFFFFLL; // 28 bits
uint64_t y = (uint64_t)tile.y & 0xFFFFFFFLL; // 28 bits
uint64_t key = (zoom << 56) | (x << 28) | (y << 0);
return key;
}
RMTile RMTileDummy()
{
RMTile t;
t.x = -1;
t.y = -1;
t.zoom = -1;
return t;
}
char RMTileIsDummy(RMTile tile)
{
return tile.x == (uint32_t)-1 && tile.y == (uint32_t)-1 && tile.zoom == (short)-1;
}
char RMTilesEqual(RMTile one, RMTile two)
{
return (one.x == two.x) && (one.y == two.y) && (one.zoom == two.zoom);
}
RMTile RMTileMake(uint32_t x, uint32_t y, short zoom)
{
RMTile t;
t.x = x;
t.y = y;
t.zoom = zoom;
return t;
}
// Round the rectangle to whole numbers of tiles
RMTileRect RMTileRectRound(RMTileRect rect)
{
rect.size.width = ceilf(rect.size.width + rect.origin.offset.x);
rect.size.height = ceilf(rect.size.height + rect.origin.offset.y);
rect.origin.offset = CGPointZero;
return rect;
}
// Dump a description of the tile to the console
void RMLogTile(RMTile tile)
{
printf("Tile at (%d,%d), zoom %hi\n", tile.x, tile.y, tile.zoom);
}