public static HttpResponseMessage GenerateImageFractal(
[HttpTrigger(AuthorizationLevel.Anonymous, methods: "get")]
HttpRequestMessage req,
ILogger log)
{
FractalInit initdata = new FractalInit
{
height = 800,
maxIterations = 128,
width = 800,
xMax = 1,
xMin = -3,
yMax = 2,
yMin = -2
};
// crate a surface
var info = new SKImageInfo(initdata.width, initdata.height);
//var pixmap = new SKPixmap();
//pixmap.
using (var surface = SKSurface.Create(info))
{
var mandelbrot = new FractalMandelbrot(initdata);
var bytes = mandelbrot.compute();
// the the canvas and properties
var canvas = surface.Canvas;
for (int y = 0; y < initdata.height; y++)
{
for (int x = 0; x < initdata.width; x++)
{
int index = 4 * (x + y * initdata.width);
canvas.DrawPoint(new SKPoint(x, y), new SKColor(bytes[index], bytes[index + 1], bytes[index + 2]));
}
}
using (var image = surface.Snapshot())
using (var data = image.Encode(SKEncodedImageFormat.Png, 100))
{
var response = new HttpResponseMessage();
response.Content = new StreamContent(data.AsStream());
response.StatusCode = System.Net.HttpStatusCode.OK;
response.Content.Headers.ContentType = new MediaTypeHeaderValue("image/png");
return(response);
}
}
}
private static SKData CreateFractalImageData(FractalInput input)
{
FractalInit initdata = InitData(0, 0, input.zoom);
// Create a surface.
var info = new SKImageInfo(initdata.width, initdata.height, SKImageInfo.PlatformColorType, SKAlphaType.Unpremul);
//using (var surface = SKSurface.Create(info))
{
var mandelbrot = new FractalMandelbrot(initdata);
var bytes = mandelbrot.compute();
// the the canvas and properties
//var canvas = surface.Canvas;
//for (int y = 0; y < initdata.height; y++)
//{
// for (int x = 0; x < initdata.width; x++)
// {
// int index = 4 * (x + y * initdata.width);
// canvas.DrawPoint(new SKPoint(x, y), new SKColor(bytes[index + 2], bytes[index + 1], bytes[index]));
// }
//}
// Optimization taken from https://github.com/mono/SkiaSharp/issues/416
// create an empty bitmap
var bitmap = new SKBitmap();
// pin the managed array so that the GC doesn't move it
var gcHandle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
// install the pixels with the color type of the pixel data
bitmap.InstallPixels(info, gcHandle.AddrOfPinnedObject(), info.RowBytes, delegate { gcHandle.Free(); }, null);
//using (var image = surface.Snapshot())
using (var image = SKImage.FromBitmap(bitmap))
{
SKData data = image.Encode(SKEncodedImageFormat.Png, 100);
return(data);
}
}
}