public Bitmap getBitmap() {
if (mTileLayer == null) return null;
// Begin a tile transaction, otherwise the buffer can be destroyed while
// we're reading from it.
beginTransaction(mTileLayer);
try {
if (mBuffer == null || mBufferSize.width <= 0 || mBufferSize.height <= 0) return null;
try {
Bitmap b = null;
if (mTileLayer instanceof MultiTileLayer) {
b =
Bitmap.createBitmap(
mBufferSize.width,
mBufferSize.height,
CairoUtils.cairoFormatTobitmapConfig(mFormat));
copyPixelsFromMultiTileLayer(b);
} else {
Log.w(
LOGTAG,
"getBitmap() called on a layer ("
+ mTileLayer
+ ") we don't know how to get a bitmap from");
}
return b;
} catch (OutOfMemoryError oom) {
Log.w(LOGTAG, "Unable to create bitmap", oom);
return null;
}
} finally {
endTransaction(mTileLayer);
}
}
public void copyPixelsFromMultiTileLayer(Bitmap target) {
Canvas c = new Canvas(target);
ByteBuffer tileBuffer = mBuffer.slice();
int bpp = CairoUtils.bitsPerPixelForCairoFormat(mFormat) / 8;
for (int y = 0; y < mBufferSize.height; y += TILE_SIZE.height) {
for (int x = 0; x < mBufferSize.width; x += TILE_SIZE.width) {
// Calculate tile size
IntSize tileSize =
new IntSize(
Math.min(mBufferSize.width - x, TILE_SIZE.width),
Math.min(mBufferSize.height - y, TILE_SIZE.height));
// Create a Bitmap from this tile
Bitmap tile =
Bitmap.createBitmap(
tileSize.width, tileSize.height, CairoUtils.cairoFormatTobitmapConfig(mFormat));
tile.copyPixelsFromBuffer(tileBuffer.asIntBuffer());
// Copy the tile to the master Bitmap and recycle it
c.drawBitmap(tile, x, y, null);
tile.recycle();
// Progress the buffer to the next tile
tileBuffer.position(tileSize.getArea() * bpp);
tileBuffer = tileBuffer.slice();
}
}
}
