public override void LoadTexture(Texture t)
{
string path = NSBundle.MainBundle.PathForResource(Path.GetFileNameWithoutExtension(t.Name), "png");
CGDataProvider dataProvider = null;
CGImage image = null;
try
{
dataProvider = CGDataProvider.FromFile(path);
image = CGImage.FromPNG(dataProvider, null, false, CGColorRenderingIntent.Default);
LoadTextureFromImage(t, image);
}
catch (Exception)
{
t.Failed = true;
return;
}
finally
{
if (dataProvider != null)
{
dataProvider.Dispose();
}
if (image != null)
{
image.Dispose();
}
}
}
public void FromPNG()
{
string file = Path.Combine(NSBundle.MainBundle.ResourcePath, "basn3p08.png");
using (var dp = CGDataProvider.FromFile(file))
using (var img = CGImage.FromPNG(dp, null, false, CGColorRenderingIntent.Default)) {
Assert.That((int)img.Height, Is.EqualTo(32), "Height");
Assert.That((int)img.Width, Is.EqualTo(32), "Width");
}
}
/// <summary>
/// Creates a composited image from a list of source images
/// </summary>
/// <param name="paths">The paths of the images, in order of lowest z-index to highest, to composite together</param>
/// <param name="saveLocation">Where to save the composited image</param>
/// <param name="overwrite"><c>true</c> to overwrite an existing file; otherwise <c>false</c>.</param>
public void CreateCompositeImage(List <string> paths, string saveLocation, bool overwrite)
{
if (!overwrite && Device.File.Exists(saveLocation))
{
return;
}
paths = paths.Where(path => path != null && Device.File.Exists(path)).ToList();
if (paths.Count == 0)
{
return;
}
try
{
var metric = System.DateTime.UtcNow;
Device.File.EnsureDirectoryExists(saveLocation);
using (new NSAutoreleasePool())
{
var images = new List <CGImage>(paths.Count);
images.AddRange(paths.Select <string, CGImage>(path => path.EndsWith(".png", StringComparison.InvariantCultureIgnoreCase) ?
CGImage.FromPNG(CGDataProvider.FromFile(path), null, false, CGColorRenderingIntent.Default) :
CGImage.FromJPEG(CGDataProvider.FromFile(path), null, false, CGColorRenderingIntent.Default)));
nint width = images[0].Width;
nint height = images[0].Height;
var bounds = new RectangleF(0, 0, width, height);
CGBitmapContext g = new CGBitmapContext(
System.IntPtr.Zero,
width,
height,
images[0].BitsPerComponent,
images[0].Width * 4,
CGColorSpace.CreateDeviceRGB(),
CGImageAlphaInfo.PremultipliedLast
);
foreach (var cgImage in images)
{
g.DrawImage(bounds, cgImage);
}
lock (padlock)
{
// UIImage.AsPNG() should be safe to run on a background thread, but MT 6.2.6.6 says otherwise.
// Xamarin confirmed that this was unintentional and that MT 6.2.7 will remove the UI check.
UIApplication.CheckForIllegalCrossThreadCalls = false;
NSError err = null;
UIImage.FromImage(g.ToImage()).AsPNG().Save(saveLocation, true, out err);
UIApplication.CheckForIllegalCrossThreadCalls = true;
}
}
Device.Log.Metric("ImageEngine icon creation", System.DateTime.UtcNow.Subtract(metric).TotalMilliseconds);
}
catch (Exception e)
{
Device.Log.Error("An error occurred while compositing the image", e);
}
}