public SkiaSharp.SKSurface CreateSurface(CGRect contentsBounds, nfloat scale, out SkiaSharp.SKImageInfo info)
{
contentsBounds.Width *= scale;
contentsBounds.Height *= scale;
// apply a scale
// get context details
this.info = info = new SkiaSharp.SKImageInfo((int)contentsBounds.Width, (int)contentsBounds.Height);
// if there are no pixels, clean up and return
if (info.Width == 0 || info.Height == 0)
{
FreeBitmap();
this.info = SkiaSharp.SKImageInfo.Empty;
return(null);
}
// if the memory size has changed, then reset the underlying memory
if (bitmapData?.Length != (nuint)info.BytesSize)
{
FreeBitmap();
}
// allocate a memory block for the drawing process
if (bitmapData == null)
{
bitmapData = NSMutableData.FromLength(info.BytesSize);
dataProvider = new CGDataProvider(bitmapData.MutableBytes, info.BytesSize, Dummy);
Element.OnSizeChanged((float)contentsBounds.Width, (float)contentsBounds.Height);
}
return(SkiaSharp.SKSurface.Create(info, bitmapData.MutableBytes, info.RowBytes));
}
public void Create(int width, int height, PixelFormat pixelFormat)
{
switch (pixelFormat)
{
case PixelFormat.Format32bppRgba:
{
const int numComponents = 4;
const int bitsPerComponent = 8;
const int bitsPerPixel = numComponents * bitsPerComponent;
const int bytesPerPixel = bitsPerPixel / 8;
int bytesPerRow = bytesPerPixel * width;
Data = NSMutableData.FromLength(bytesPerRow * height);
provider = new CGDataProvider(Data.MutableBytes, (int)Data.Length, false);
cgimage = new CGImage(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, CGColorSpace.CreateDeviceRGB(), CGBitmapFlags.ByteOrder32Little | CGBitmapFlags.PremultipliedFirst, provider, null, true, CGColorRenderingIntent.Default);
Control = UIImage.FromImage(cgimage, 0f, UIImageOrientation.Up);
break;
}
case PixelFormat.Format32bppRgb:
{
const int numComponents = 4;
const int bitsPerComponent = 8;
const int bitsPerPixel = numComponents * bitsPerComponent;
const int bytesPerPixel = bitsPerPixel / 8;
int bytesPerRow = bytesPerPixel * width;
Data = NSMutableData.FromLength(bytesPerRow * height);
//Data = new NSMutableData ((uint)(bytesPerRow * height));
provider = new CGDataProvider(Data.MutableBytes, (int)Data.Length, false);
cgimage = new CGImage(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, CGColorSpace.CreateDeviceRGB(), CGBitmapFlags.ByteOrder32Little | CGBitmapFlags.NoneSkipFirst, provider, null, true, CGColorRenderingIntent.Default);
Control = UIImage.FromImage(cgimage, 0f, UIImageOrientation.Up);
break;
}
case PixelFormat.Format24bppRgb:
{
const int numComponents = 3;
const int bitsPerComponent = 8;
const int bitsPerPixel = numComponents * bitsPerComponent;
const int bytesPerPixel = bitsPerPixel / 8;
int bytesPerRow = bytesPerPixel * width;
Data = new NSMutableData((uint)(bytesPerRow * height));
provider = new CGDataProvider(Data.MutableBytes, (int)Data.Length, false);
cgimage = new CGImage(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, CGColorSpace.CreateDeviceRGB(), CGBitmapFlags.ByteOrder32Little | CGBitmapFlags.PremultipliedFirst, provider, null, true, CGColorRenderingIntent.Default);
Control = UIImage.FromImage(cgimage, 0f, UIImageOrientation.Up);
break;
}
default:
throw new ArgumentOutOfRangeException("pixelFormat", pixelFormat, "Not supported");
}
}
public void FromLength()
{
Assert.Throws <ArgumentOutOfRangeException> (delegate {
NSMutableData.FromLength(-1);
}, "negative");
using (var empty = NSMutableData.FromLength(0)) {
Assert.That(empty.Length, Is.EqualTo((nuint)0), "Length");
}
}
public SKSurface CreateSurface(CGRect contentsBounds, nfloat scale, out SKImageInfo info)
{
// apply a scale
contentsBounds.Width *= scale;
contentsBounds.Height *= scale;
// get context details
Info = info = CreateInfo((int)contentsBounds.Width, (int)contentsBounds.Height);
// if there are no pixels, clean up and return
if (info.Width == 0 || info.Height == 0)
{
Dispose();
return(null);
}
// if the memory size has changed, then reset the underlying memory
if (bitmapData?.Length != (nuint)info.BytesSize)
{
FreeBitmap();
}
// allocate a memory block for the drawing process
if (bitmapData == null)
{
bitmapData = NSMutableData.FromLength(info.BytesSize);
// in case allocation has failed
if (bitmapData == null)
{
Dispose();
info = Info;
return(null);
}
dataProvider = new CGDataProvider(bitmapData.MutableBytes, info.BytesSize, Dummy);
void Dummy(IntPtr data)
{
// do nothing as we manage the memory separately
}
}
return(SKSurface.Create(info, bitmapData.MutableBytes, info.RowBytes));
}