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add function to get visible tiles only

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This commit is contained in:
Hannes Janetzek 2013-02-04 01:02:54 +01:00
parent f3f1c4ae54
commit 0d87aabd3d
1 changed files with 57 additions and 17 deletions
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74
src/org/oscim/renderer/GLRenderer.java
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@ -320,6 +320,8 @@ public class GLRenderer implements GLSurfaceView.Renderer {
}
}
private static Object tilelock = new Object();
static void draw() {
long start = 0;
@ -372,27 +374,31 @@ public class GLRenderer implements GLSurfaceView.Renderer {
MapTile[] tiles = mDrawTiles.tiles;
if (changed) {
// get visible tiles
for (int i = 0; i < tileCnt; i++)
tiles[i].isVisible = false;
synchronized (GLRenderer.tilelock) {
// relative zoom-level, 'tiles' could not have been updated after
// zoom-level changed.
byte z = tiles[0].zoomLevel;
float div = FastMath.pow(z - pos.zoomLevel);
// get visible tiles
for (int i = 0; i < tileCnt; i++)
tiles[i].isVisible = false;
// transform screen coordinates to tile coordinates
float scale = pos.scale / div;
float px = (float) pos.x * div;
float py = (float) pos.y * div;
// relative zoom-level, 'tiles' could not have been updated after
// zoom-level changed.
byte z = tiles[0].zoomLevel;
float div = FastMath.pow(z - pos.zoomLevel);
if (div != 1)
Log.d(TAG, "tiles not from current zoom level");
// transform screen coordinates to tile coordinates
float scale = pos.scale / div;
float px = (float) pos.x * div;
float py = (float) pos.y * div;
for (int i = 0; i < 8; i += 2) {
coords[i + 0] = (px + coords[i + 0] / scale) / Tile.TILE_SIZE;
coords[i + 1] = (py + coords[i + 1] / scale) / Tile.TILE_SIZE;
for (int i = 0; i < 8; i += 2) {
coords[i + 0] = (px + coords[i + 0] / scale) / Tile.TILE_SIZE;
coords[i + 1] = (py + coords[i + 1] / scale) / Tile.TILE_SIZE;
}
mHolderCount = 0;
mScanBox.scan(coords, z);
}
mHolderCount = 0;
mScanBox.scan(coords, z);
}
tileCnt += mHolderCount;
@ -506,6 +512,40 @@ public class GLRenderer implements GLSurfaceView.Renderer {
return ((t.tileX % 4) + (t.tileY % 4 * 4) + 1);
}
public static TileSet getVisibleTiles(TileSet td) {
if (mDrawTiles == null)
return td;
MapTile[] newTiles = mDrawTiles.tiles;
int cnt = mDrawTiles.cnt;
MapTile[] nextTiles;
synchronized (TileManager.tilelock) {
// lock tiles (and their proxies) to not be removed from cache
for (int i = 0; i < cnt; i++)
if (newTiles[i].isVisible)
newTiles[i].lock();
if (td == null)
td = new TileSet(newTiles.length);
nextTiles = td.tiles;
// unlock previously active tiles
for (int i = 0, n = td.cnt; i < n; i++)
nextTiles[i].unlock();
}
synchronized (GLRenderer.tilelock) {
// copy newTiles to nextTiles
td.cnt = 0;
for (int i = 0; i < cnt; i++)
if (newTiles[i].isVisible)
nextTiles[td.cnt++] = newTiles[i];
}
return td;
}
@Override
public void onSurfaceChanged(GL10 glUnused, int width, int height) {
Log.d(TAG, "SurfaceChanged:" + mNewSurface + " " + width + " " + height);