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Code working, no memory issue with bitmaps

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Signed-off-by: yvecai <yvecai@gmail.com>
This commit is contained in:
yvecai 2012-02-07 20:57:12 +01:00 committed by Jindřich Makovička
parent 164315899e
commit a0833cb486
1 changed files with 51 additions and 47 deletions
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98
OsmAnd/src/net/osmand/plus/SQLiteTileSource.java
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@ -199,17 +199,23 @@ public class SQLiteTileSource implements ITileSource {
}
private Bitmap getMetaTile(int x, int y, int zoom) {
// return a 3x3 metatile (768x768 px) around a given tile
// return a 268x268 tile ((6+256+6)x(6+256+6) px) around a given tile
// based on its neighbor. This is needed to have a nice bilinear resampling
// on tile edges. A 258x258 would do well, but maybe somebody wants to
// implement bicubic resampling for nicer effect.
// The code looks bad because we load only one 256x256 bitmap at a time
// instead of cropping from a 768x768 bitmap, which causes memory issues.
SQLiteDatabase db = getDatabase();
if(db == null){
return null;
}
Bitmap stitchedImage = Bitmap.createBitmap(268, 268, Config.ARGB_8888);
Canvas canvas = new Canvas(stitchedImage);
//1
Cursor cursor = db.rawQuery(
"SELECT image FROM tiles WHERE x = ? AND y = ? AND z = ?",
new String[] {x-1+"", y-1+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
new String[] {(x-1)+"", (y-1)+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
byte[] blob = null;
if(cursor.moveToFirst()) {
blob = cursor.getBlob(0);
@ -218,16 +224,15 @@ public class SQLiteTileSource implements ITileSource {
if(blob != null){
Bitmap Tile = BitmapFactory.decodeByteArray(blob, 0, blob.length);
blob = null;
System.gc();
Rect src = new Rect(250, 250, 6, 6);
Rect dst = new Rect(0,0,0,0);
Rect src = new Rect(250, 250, 256, 256);
Rect dst = new Rect(0,0,6,6);
canvas.drawBitmap(Tile, src, dst, null);
Tile.recycle();
//Tile.recycle();
}
//2
cursor = db.rawQuery(
"SELECT image FROM tiles WHERE x = ? AND y = ? AND z = ?",
new String[] {x-1+"", y+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
new String[] {(x)+"", (y-1)+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
blob = null;
if(cursor.moveToFirst()) {
blob = cursor.getBlob(0);
@ -236,16 +241,15 @@ public class SQLiteTileSource implements ITileSource {
if(blob != null){
Bitmap Tile = BitmapFactory.decodeByteArray(blob, 0, blob.length);
blob = null;
System.gc();
Rect src = new Rect(0, 250, 256, 6);
Rect dst = new Rect(6,0,256,6);
Rect src = new Rect(0, 250, 256, 256);
Rect dst = new Rect(6,0,262,6);
canvas.drawBitmap(Tile, src, dst, null);
Tile.recycle();
//Tile.recycle();
}
//3
cursor = db.rawQuery(
"SELECT image FROM tiles WHERE x = ? AND y = ? AND z = ?",
new String[] {x-1+"", y+1+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
new String[] {(x+1)+"", (y-1)+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
blob = null;
if(cursor.moveToFirst()) {
blob = cursor.getBlob(0);
@ -254,16 +258,15 @@ public class SQLiteTileSource implements ITileSource {
if(blob != null){
Bitmap Tile = BitmapFactory.decodeByteArray(blob, 0, blob.length);
blob = null;
System.gc();
Rect src = new Rect(0, 250, 6, 6);
Rect dst = new Rect(262,0,6,6);
Rect src = new Rect(0, 250, 6, 256);
Rect dst = new Rect(262,0,268,6);
canvas.drawBitmap(Tile, src, dst, null);
Tile.recycle();
//Tile.recycle();
}
//4
cursor = db.rawQuery(
"SELECT image FROM tiles WHERE x = ? AND y = ? AND z = ?",
new String[] {x+"", y-1+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
new String[] {(x-1)+"", (y)+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
blob = null;
if(cursor.moveToFirst()) {
blob = cursor.getBlob(0);
@ -272,16 +275,15 @@ public class SQLiteTileSource implements ITileSource {
if(blob != null){
Bitmap Tile = BitmapFactory.decodeByteArray(blob, 0, blob.length);
blob = null;
System.gc();
Rect src = new Rect(250, 0, 6, 256);
Rect dst = new Rect(0,6,6,256);
Rect src = new Rect(250, 0, 256, 256);
Rect dst = new Rect(0,6,6,262);
canvas.drawBitmap(Tile, src, dst, null);
Tile.recycle();
//Tile.recycle();
}
//5
cursor = db.rawQuery(
"SELECT image FROM tiles WHERE x = ? AND y = ? AND z = ?",
new String[] {x+"", y+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
new String[] {(x)+"", y+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
blob = null;
if(cursor.moveToFirst()) {
blob = cursor.getBlob(0);
@ -290,15 +292,15 @@ public class SQLiteTileSource implements ITileSource {
if(blob != null){
Bitmap Tile = BitmapFactory.decodeByteArray(blob, 0, blob.length);
blob = null;
System.gc();
Rect src = new Rect(0, 0, 256, 256);
Rect dst = new Rect(6,6,256,256);
Rect dst = new Rect(6,6,262,262);
canvas.drawBitmap(Tile, src, dst, null);
Tile.recycle();
//Tile.recycle();
}
//6
cursor = db.rawQuery(
"SELECT image FROM tiles WHERE x = ? AND y = ? AND z = ?",
new String[] {x+"", y+1+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
new String[] {(x+1)+"", (y)+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
blob = null;
if(cursor.moveToFirst()) {
blob = cursor.getBlob(0);
@ -307,15 +309,15 @@ public class SQLiteTileSource implements ITileSource {
if(blob != null){
Bitmap Tile = BitmapFactory.decodeByteArray(blob, 0, blob.length);
blob = null;
System.gc();
Rect src = new Rect(0, 0, 6, 256);
Rect dst = new Rect(262,6,6,256);
Rect dst = new Rect(262,6,268,262);
canvas.drawBitmap(Tile, src, dst, null);
Tile.recycle();
//Tile.recycle();
}
//7
cursor = db.rawQuery(
"SELECT image FROM tiles WHERE x = ? AND y = ? AND z = ?",
new String[] {x+1+"", y-1+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
new String[] {(x-1)+"", (y+1)+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
blob = null;
if(cursor.moveToFirst()) {
blob = cursor.getBlob(0);
@ -324,15 +326,15 @@ public class SQLiteTileSource implements ITileSource {
if(blob != null){
Bitmap Tile = BitmapFactory.decodeByteArray(blob, 0, blob.length);
blob = null;
System.gc();
Rect src = new Rect(250, 0, 6, 6);
Rect dst = new Rect(0,262,6,6);
Rect src = new Rect(250, 0, 256, 6);
Rect dst = new Rect(0,262,6,268);
canvas.drawBitmap(Tile, src, dst, null);
Tile.recycle();
//Tile.recycle();
}
//8
cursor = db.rawQuery(
"SELECT image FROM tiles WHERE x = ? AND y = ? AND z = ?",
new String[] {x+1+"", y+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
new String[] {(x)+"", (y+1)+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
blob = null;
if(cursor.moveToFirst()) {
blob = cursor.getBlob(0);
@ -341,15 +343,15 @@ public class SQLiteTileSource implements ITileSource {
if(blob != null){
Bitmap Tile = BitmapFactory.decodeByteArray(blob, 0, blob.length);
blob = null;
System.gc();
Rect src = new Rect(0, 0, 256, 6);
Rect dst = new Rect(6,262,256,6);
Rect dst = new Rect(6,262,262,268);
canvas.drawBitmap(Tile, src, dst, null);
Tile.recycle();
//Tile.recycle();
}
//9
cursor = db.rawQuery(
"SELECT image FROM tiles WHERE x = ? AND y = ? AND z = ?",
new String[] {x+1+"", y+1+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
new String[] {(x+1)+"", (y+1)+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
blob = null;
if(cursor.moveToFirst()) {
blob = cursor.getBlob(0);
@ -358,13 +360,12 @@ public class SQLiteTileSource implements ITileSource {
if(blob != null){
Bitmap Tile = BitmapFactory.decodeByteArray(blob, 0, blob.length);
blob = null;
System.gc();
Rect src = new Rect(0, 0, 6, 6);
Rect dst = new Rect(262,262,6,6);
Rect dst = new Rect(262,262,268,268);
canvas.drawBitmap(Tile, src, dst, null);
Tile.recycle();
}
System.gc();
return stitchedImage; // return a 256x256 tile + 6px margin
}
@ -374,6 +375,7 @@ public class SQLiteTileSource implements ITileSource {
return null;
}
if ( zoom <= baseZoom) {
// return the normal tile if exists
Cursor cursor = db.rawQuery("SELECT image FROM tiles WHERE x = ? AND y = ? AND z = ?", new String[] {x+"", y+"",(17 - zoom)+""}); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$//$NON-NLS-4$
byte[] blob = null;
if(cursor.moveToFirst()) {
@ -385,6 +387,7 @@ public class SQLiteTileSource implements ITileSource {
}
return null;
} else {
// return a resampled tile from its last parent
int n = zoom - baseZoom;
int base_xtile = (int)(x / Math.pow(2,n));
int base_ytile = (int)(y / Math.pow(2,n));
@ -392,6 +395,7 @@ public class SQLiteTileSource implements ITileSource {
Bitmap metaTile = getMetaTile(base_xtile, base_ytile, baseZoom);
if(metaTile != null){
//return Bitmap.createScaledBitmap(metaTile,256,256,false);
// in tile space:
int scaledSize= (int)(256/Math.pow(2,n));
int offset_x= (int)((x - base_xtile*Math.pow(2,n)));