调整大小和处理方向的可行解决方案
public class ImageResizer : IImageResizer
{
private const int Quality = 75;
public byte[] Resize(byte[] data, int newWidth, int newHeight)
{
using (var inputStream = new SKMemoryStream(data))
{
using (var codec = SKCodec.Create(inputStream))
{
using (var original_old = SKBitmap.Decode(codec))
{
int sourceWidth = original_old.Width;
int sourceHeight = original_old.Height;
float nPercentW = ((float) newWidth / (float) sourceWidth);
float nPercentH = ((float) newHeight / (float) sourceHeight);
float nPercent = nPercentH < nPercentW ? nPercentH : nPercentW;
int destWidth = (int) (sourceWidth * nPercent);
int destHeight = (int) (sourceHeight * nPercent);
using (SKBitmap original = original_old.Resize(new SKImageInfo(destWidth, destHeight), SKFilterQuality.Medium))
{
var useWidth = original.Width;
var useHeight = original.Height;
Action<SKCanvas> transform = canvas => { };
switch (codec.EncodedOrigin)
{
case SKEncodedOrigin.TopLeft:
break;
case SKEncodedOrigin.TopRight:
// flip along the x-axis
transform = canvas => canvas.Scale(-1, 1, useWidth / 2, useHeight / 2);
break;
case SKEncodedOrigin.BottomRight:
transform = canvas => canvas.RotateDegrees(180, useWidth / 2, useHeight / 2);
break;
case SKEncodedOrigin.BottomLeft:
// flip along the y-axis
transform = canvas => canvas.Scale(1, -1, useWidth / 2, useHeight / 2);
break;
case SKEncodedOrigin.LeftTop:
useWidth = original.Height;
useHeight = original.Width;
transform = canvas =>
{
// Rotate 90
canvas.RotateDegrees(90, useWidth / 2, useHeight / 2);
canvas.Scale(useHeight * 1.0f / useWidth, -useWidth * 1.0f / useHeight, useWidth / 2, useHeight / 2);
};
break;
case SKEncodedOrigin.RightTop:
useWidth = original.Height;
useHeight = original.Width;
transform = canvas =>
{
// Rotate 90
canvas.RotateDegrees(90, useWidth / 2, useHeight / 2);
canvas.Scale(useHeight * 1.0f / useWidth, useWidth * 1.0f / useHeight, useWidth / 2, useHeight / 2);
};
break;
case SKEncodedOrigin.RightBottom:
useWidth = original.Height;
useHeight = original.Width;
transform = canvas =>
{
// Rotate 90
canvas.RotateDegrees(90, useWidth / 2, useHeight / 2);
canvas.Scale(-useHeight * 1.0f / useWidth, useWidth * 1.0f / useHeight, useWidth / 2, useHeight / 2);
};
break;
case SKEncodedOrigin.LeftBottom:
useWidth = original.Height;
useHeight = original.Width;
transform = canvas =>
{
// Rotate 90
canvas.RotateDegrees(90, useWidth / 2, useHeight / 2);
canvas.Scale(-useHeight * 1.0f / useWidth, -useWidth * 1.0f / useHeight, useWidth / 2, useHeight / 2);
};
break;
}
var info = new SKImageInfo(useWidth, useHeight);
using (var surface = SKSurface.Create(info))
{
using (var paint = new SKPaint())
{
// high quality with antialiasing
paint.IsAntialias = true;
paint.FilterQuality = SKFilterQuality.High;
// rotate according to origin
transform.Invoke(surface.Canvas);
// draw the bitmap to fill the surface
surface.Canvas.DrawBitmap(original, info.Rect, paint);
surface.Canvas.Flush();
using (SKImage image = surface.Snapshot())
{
return image.Encode(SKEncodedImageFormat.Jpeg, Quality).ToArray();
}
}
}
}
}
}
}
}
}