private static SKBitmap ZoomAndRotate(SKBitmap originalBitmap, float aspectRatio, int zoom, bool isRotated, float rotation, bool isKeystoned, float keystone)
{
var rotatedAndZoomed = new SKBitmap(originalBitmap.Width, originalBitmap.Height);
using (var tempCanvas = new SKCanvas(rotatedAndZoomed))
{
var rightVerticalZoom = aspectRatio * zoom;
var zoomedX = zoom / -2f;
var zoomedY = rightVerticalZoom / -2f;
var zoomedWidth = originalBitmap.Width + zoom;
var zoomedHeight = originalBitmap.Height + rightVerticalZoom;
if (isRotated)
{
tempCanvas.RotateDegrees(rotation, originalBitmap.Width / 2f,
originalBitmap.Height / 2f);
}
tempCanvas.DrawBitmap(
originalBitmap,
SKRect.Create(
0,
0,
originalBitmap.Width,
originalBitmap.Height),
SKRect.Create(
zoomedX,
zoomedY,
zoomedWidth,
zoomedHeight
));
if (isRotated)
{
tempCanvas.RotateDegrees(rotation, -1 * originalBitmap.Width / 2f,
originalBitmap.Height / 2f);
}
}
SKBitmap keystoned = null;
if (isKeystoned)
{
keystoned = new SKBitmap(originalBitmap.Width, originalBitmap.Height);
using (var tempCanvas = new SKCanvas(keystoned))
{
tempCanvas.SetMatrix(TaperTransform.Make(new SKSize(originalBitmap.Width, originalBitmap.Height),
keystone > 0 ? TaperSide.Left : TaperSide.Right, TaperCorner.Both, 1 - Math.Abs(keystone)));
tempCanvas.DrawBitmap(rotatedAndZoomed, 0, 0);
rotatedAndZoomed.Dispose();
}
}
return(keystoned ?? rotatedAndZoomed);
}
private static SKBitmap ZoomAndRotate(SKBitmap originalBitmap, double zoom, bool isRotated, float rotation, bool isKeystoned, float keystone)
{
var rotatedAndZoomed = new SKBitmap(originalBitmap.Width, originalBitmap.Height);
using (var tempCanvas = new SKCanvas(rotatedAndZoomed))
{
var zoomedX = originalBitmap.Width * zoom / -2f;
var zoomedY = originalBitmap.Height * zoom / -2f;
var zoomedWidth = originalBitmap.Width * (1 + zoom);
var zoomedHeight = originalBitmap.Height * (1 + zoom);
if (isRotated)
{
tempCanvas.RotateDegrees(rotation, originalBitmap.Width / 2f,
originalBitmap.Height / 2f);
}
tempCanvas.DrawBitmap(
originalBitmap,
SKRect.Create(
(float)zoomedX,
(float)zoomedY,
(float)zoomedWidth,
(float)zoomedHeight
)); // blows up the bitmap, which is cut off later
if (isRotated)
{
tempCanvas.RotateDegrees(rotation, -1 * originalBitmap.Width / 2f,
originalBitmap.Height / 2f);
}
}
SKBitmap keystoned = null;
if (isKeystoned)
{
keystoned = new SKBitmap(originalBitmap.Width, originalBitmap.Height);
using (var tempCanvas = new SKCanvas(keystoned))
{
tempCanvas.SetMatrix(TaperTransform.Make(new SKSize(originalBitmap.Width, originalBitmap.Height),
keystone > 0 ? TaperSide.Left : TaperSide.Right, TaperCorner.Both, 1 - Math.Abs(keystone)));
tempCanvas.DrawBitmap(rotatedAndZoomed, 0, 0);
rotatedAndZoomed.Dispose();
}
}
return(keystoned ?? rotatedAndZoomed);
}
