/// <summary>
/// Obtains a new image from this cache.
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public override INativeImage Obtain(byte[] data)
{
OsmSharp.Logging.Log.TraceEvent("NativeImageCache",
Logging.TraceEventType.Information, "Bitmap obtain: {0} {1}", _unusedImages.Count, _usedImages.Count);
lock (_usedImages)
{ // synchronize access to this cache.
if (_unusedImages.Count > 0)
{ // there are unused images, first recover one from there.
// get unused image and remove.
var unusedImage = _unusedImages.First();
_unusedImages.Remove(unusedImage);
var newNativeImage = global::Android.Graphics.BitmapFactory.DecodeByteArray(data, 0, data.Length, new global::Android.Graphics.BitmapFactory.Options()
{
InBitmap = (unusedImage as NativeImage).Image,
InSampleSize = 1
});
// DecodeByteArray could return null: if we assign null to
// NativeImage.Image, NativeImage.GetHashCode crashes on a
// NullPointerException. So in this case, just roll back
// and return null. User code should handle this.
if (newNativeImage == null)
{
// Rollback
_unusedImages.Add(unusedImage);
return(null);
}
// change native image and add to used images.
(unusedImage as NativeImage).Image = newNativeImage;
_usedImages.Add(unusedImage);
return(unusedImage);
}
else if (_unusedImages.Count + _usedImages.Count < _cacheSize)
{ // there is still space to add a used iamge.
var newNativeImage = global::Android.Graphics.BitmapFactory.DecodeByteArray(data, 0, data.Length, new global::Android.Graphics.BitmapFactory.Options()
{
InSampleSize = 1,
InMutable = true
});
var usedImage = new NativeImage(newNativeImage);
_usedImages.Add(usedImage);
return(usedImage);
}
else
{ // there are no unused images left and there is no more room.
throw new Exception("Cannot get a new image from cache, no image left.");
}
}
}
/// <summary>
/// Renders the current complete scene.
/// </summary>
private void Render()
{
try
{
if (_renderingSuspended)
{ // no rendering when rendering is suspended.
return;
}
if (_cacheRenderer.IsRunning)
{ // cancel previous render.
_cacheRenderer.CancelAndWait();
}
// make sure only on thread at the same time is using the renderer.
lock (_cacheRenderer)
{
this.Map.ViewChangedCancel();
// build the layers list.
var layers = new List<Layer>();
for (int layerIdx = 0; layerIdx < this.Map.LayerCount; layerIdx++)
{ // get the layer.
if (this.Map[layerIdx].IsVisible)
{
layers.Add(this.Map[layerIdx]);
}
}
// add the internal layers.
layers.Add(_makerLayer);
if (this.SurfaceHeight == 0)
{ // the surface has no height yet. Impossible to render like this.
return;
}
// get old image if available.
NativeImage image = null;
if (_offScreenBuffer != null)
{ // get the native image from the off-screen buffer.
image = _offScreenBuffer.NativeImage as NativeImage;
}
// resize image if needed.
float sizeX = this.SurfaceWidth;
float sizeY = this.SurfaceHeight;
//if(this.MapAllowTilt)
//{ // when rotation is allowed make sure a square is rendered.
// sizeX = System.Math.Max(this.SurfaceWidth, this.SurfaceHeight);
// sizeY = System.Math.Max(this.SurfaceWidth, this.SurfaceHeight);
//}
// float size = System.Math.Max(this.SurfaceHeight, this.SurfaceWidth);
if (image == null ||
image.Image.Width != (int)(sizeX * _extra) ||
image.Image.Height != (int)(sizeY * _extra))
{ // create a bitmap and render there.
if (image != null)
{ // make sure to dispose the old image.
image.Dispose();
}
image = new NativeImage(global::Android.Graphics.Bitmap.CreateBitmap((int)(sizeX * _extra),
(int)(sizeY * _extra),
global::Android.Graphics.Bitmap.Config.Argb8888));
}
// create and reset the canvas.
using (var canvas = new global::Android.Graphics.Canvas(image.Image))
{
canvas.DrawColor(new global::Android.Graphics.Color(
SimpleColor.FromKnownColor(KnownColor.White).Value));
// create the view.
double[] sceneCenter = this.Map.Projection.ToPixel(this.MapCenter.Latitude, this.MapCenter.Longitude);
float mapZoom = this.MapZoom;
float sceneZoomFactor = (float)this.Map.Projection.ToZoomFactor(this.MapZoom);
// create the view for this control.
float scaledNormalWidth = image.Image.Width / _bufferFactor;
float scaledNormalHeight = image.Image.Height / _bufferFactor;
var view = View2D.CreateFrom((float)sceneCenter[0], (float)sceneCenter[1],
scaledNormalWidth * _extra, scaledNormalHeight * _extra, sceneZoomFactor,
_invertX, _invertY, this.MapTilt);
long before = DateTime.Now.Ticks;
OsmSharp.Logging.Log.TraceEvent("OsmSharp.Android.UI.MapView", TraceEventType.Information,
"Rendering Start");
// notify the map that the view has changed.
if (_previouslyChangedView == null ||
!_previouslyChangedView.Equals(view))
{ // report change once!
var normalView = View2D.CreateFrom((float)sceneCenter[0], (float)sceneCenter[1],
scaledNormalWidth, scaledNormalHeight, sceneZoomFactor,
_invertX, _invertY, this.MapTilt);
this.Map.ViewChanged((float)this.Map.Projection.ToZoomFactor(this.MapZoom), this.MapCenter,
normalView, view);
_previouslyChangedView = view;
long afterViewChanged = DateTime.Now.Ticks;
OsmSharp.Logging.Log.TraceEvent("OsmSharp.Android.UI.MapView", TraceEventType.Information,
"View change took: {0}ms @ zoom level {1}",
(new TimeSpan(afterViewChanged - before).TotalMilliseconds), this.MapZoom);
}
// does the rendering.
_cacheRenderer.Density = this.MapScaleFactor;
bool complete = _cacheRenderer.Render(canvas, _map.Projection, layers, view, (float)this.Map.Projection.ToZoomFactor(this.MapZoom));
long afterRendering = DateTime.Now.Ticks;
OsmSharp.Logging.Log.TraceEvent("OsmSharp.Android.UI.MapView", TraceEventType.Information,
"Rendering took: {0}ms @ zoom level {1} and {2}",
(new TimeSpan(afterRendering - before).TotalMilliseconds), this.MapZoom, this.MapCenter);
if (complete)
{ // there was no cancellation, the rendering completely finished.
// add the result to the scene cache.
// add the newly rendered image again.
if (_offScreenBuffer == null)
{ // create the offscreen buffer first.
_offScreenBuffer = new ImageTilted2D(view.Rectangle, image, float.MinValue, float.MaxValue);
}
else
{ // augment the previous buffer.
_offScreenBuffer.Bounds = view.Rectangle;
_offScreenBuffer.NativeImage = image;
}
var temp = _onScreenBuffer;
_onScreenBuffer = _offScreenBuffer;
_offScreenBuffer = temp;
}
long after = DateTime.Now.Ticks;
if (complete)
{ // report a successful render to listener.
_listener.NotifyRenderSuccess(view, mapZoom, (int)new TimeSpan(after - before).TotalMilliseconds);
}
}
}
// notify the the current surface of the new rendering.
this.PostInvalidate();
}
catch (Exception ex)
{ // exceptions can be thrown when the mapview is disposed while rendering.
// don't worry too much about these, the mapview is garbage anyway.
OsmSharp.Logging.Log.TraceEvent("MapViewSurface", TraceEventType.Critical,
string.Format("An unhandled exception occured:{0}", ex.ToString()));
}
}
/// <summary>
/// Obtains a new image from this cache.
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public override INativeImage Obtain(byte[] data)
{
OsmSharp.Logging.Log.TraceEvent("NativeImageCache",
Logging.TraceEventType.Information, "Bitmap obtain: {0} {1}", _unusedImages.Count, _usedImages.Count);
lock (_usedImages)
{ // synchronize access to this cache.
if (_unusedImages.Count > 0)
{ // there are unused images, first recover one from there.
// get unused image and remove.
var unusedImage = _unusedImages.First();
_unusedImages.Remove(unusedImage);
var newNativeImage = global::Android.Graphics.BitmapFactory.DecodeByteArray(data, 0, data.Length, new global::Android.Graphics.BitmapFactory.Options()
{
InBitmap = (unusedImage as NativeImage).Image,
InSampleSize = 1
});
// DecodeByteArray could return null: if we assign null to
// NativeImage.Image, NativeImage.GetHashCode crashes on a
// NullPointerException. So in this case, just roll back
// and return null. User code should handle this.
if (newNativeImage == null)
{
// Rollback
_unusedImages.Add(unusedImage);
return null;
}
// change native image and add to used images.
(unusedImage as NativeImage).Image = newNativeImage;
_usedImages.Add(unusedImage);
return unusedImage;
}
else if (_unusedImages.Count + _usedImages.Count < _cacheSize)
{ // there is still space to add a used iamge.
var newNativeImage = global::Android.Graphics.BitmapFactory.DecodeByteArray(data, 0, data.Length, new global::Android.Graphics.BitmapFactory.Options()
{
InSampleSize = 1,
InMutable = true
});
var usedImage = new NativeImage(newNativeImage);
_usedImages.Add(usedImage);
return usedImage;
}
else
{ // there are no unused images left and there is no more room.
throw new Exception("Cannot get a new image from cache, no image left.");
}
}
}
