public static IImageProcessingContext <TPixel> Resize <TPixel>(this IImageProcessingContext <TPixel> source, Size target) where TPixel : struct, IPixel <TPixel>
{
if (target.Width == 0 && target.Height == 0)
{
return(source);
}
var origin = source.GetCurrentSize();
if (target.Width == 0)
{
var rate = (float)origin.Height / target.Height;
if (rate <= 1)
{
return(source);
}
return(source.Resize <TPixel>((int)(origin.Width / rate), target.Height, KnownResamplers.Bicubic, false));
}
if (target.Height == 0)
{
var rate = (float)origin.Width / target.Width;
if (rate <= 1)
{
return(source);
}
return(source.Resize <TPixel>(target.Width, (int)(origin.Height / rate), KnownResamplers.Bicubic, false));
}
var size = new Size();
var r = Math.Max(((float)origin.Width / target.Width), ((float)origin.Height) / target.Height);
if (r <= 1)
{
return(source);
}
size.Width = (int)Math.Round(origin.Width / r);
size.Height = (int)Math.Round(origin.Height / r);
if (size.Width == 0)
{
size.Width = 1;
}
if (size.Height == 0)
{
size.Height = 1;
}
return(source.Resize <TPixel>(size, KnownResamplers.Bicubic, false));
}
private static IImageProcessingContext <Rgba32> ConvertToAvatar(this IImageProcessingContext <Rgba32> processingContext, Size size, float cornerRadius)
{
return(processingContext.Resize(new ResizeOptions {
Size = size,
Mode = ResizeMode.Crop
}).Apply(i => ApplyRoundedCorners(i, cornerRadius)));
}
private Matrix <float> ApplyFitWithLetterbox(IImageProcessingContext <Rgba32> context, Image <Rgba32> image)
{
var imageAspectRatio = image.Width / (double)image.Height;
var boxAspectRatio = MaxWidth / (double)MaxHeight;
double scaledWidth = image.Width;
double scaledHeight = image.Height;
var drawingPoint = new Point(0, 0);
if (imageAspectRatio < boxAspectRatio)
{
// box is wider than image
scaledWidth = image.Height * boxAspectRatio;
scaledHeight = image.Height;
drawingPoint = new Point((int)((scaledWidth - image.Width) / 2), 0);
}
else if (boxAspectRatio < imageAspectRatio)
{
// image is wider than box
scaledHeight = image.Width / boxAspectRatio;
scaledWidth = image.Width;
drawingPoint = new Point(0, (int)((scaledHeight - image.Height) / 2));
}
context.Resize((int)scaledWidth, (int)scaledHeight);
context.DrawImage(GraphicsOptions, image, drawingPoint);
return(GetProjectiveTransformationMatrix((float)scaledWidth, (float)scaledHeight));
}
public static IImageProcessingContext ConvertToRounded(this IImageProcessingContext processingContext, Size size, float cornerRadius)
{
return(processingContext.Resize(new ResizeOptions
{
Size = size,
Mode = ResizeMode.Crop
}).ApplyRoundedCorners(cornerRadius));
}
private static IImageProcessingContext Crop(this IImageProcessingContext processingContext, Size size)
{
return(processingContext.Resize(new ResizeOptions
{
Size = size,
Mode = ResizeMode.Crop
}));
}
internal static void ConvertToAvatar(this IImageProcessingContext processingContext, Size size,
float cornerRadius)
{
processingContext.Resize(new ResizeOptions
{
Size = size,
Mode = ResizeMode.Crop
}).ApplyRoundedCorners(cornerRadius);
}
/// <summary>
/// Evenly pads an image to fit the new dimensions.
/// </summary>
/// <param name="source">The source image to pad.</param>
/// <param name="width">The new width.</param>
/// <param name="height">The new height.</param>
/// <returns>The <see cref="IImageProcessingContext"/> to allow chaining of operations.</returns>
public static IImageProcessingContext Pad(this IImageProcessingContext source, int width, int height)
{
var options = new ResizeOptions
{
Size = new Size(width, height),
Mode = ResizeMode.BoxPad,
Sampler = KnownResamplers.NearestNeighbor,
};
return(source.Resize(options));
}
/// <summary>
/// Evenly pads an image to fit the new dimensions.
/// </summary>
/// <typeparam name="TPixel">The pixel format.</typeparam>
/// <param name="source">The source image to pad.</param>
/// <param name="width">The new width.</param>
/// <param name="height">The new height.</param>
/// <returns>The <see cref="Image{TPixel}"/>.</returns>
public static IImageProcessingContext <TPixel> Pad <TPixel>(this IImageProcessingContext <TPixel> source, int width, int height)
where TPixel : struct, IPixel <TPixel>
{
var options = new ResizeOptions
{
Size = new Size(width, height),
Mode = ResizeMode.BoxPad,
Sampler = ResampleMode.NearestNeighbor
};
return(source.Resize(options));
}
public IImageProcessingContext <Rgba32> Apply(IImageProcessingContext <Rgba32> image)
{
Size?size = GetSize();
if (size == null)
{
return(image);
}
return(image.Resize(new ResizeOptions
{
Size = size.Value,
Position = _anchor,
Mode = _mode
}));
}
private static IImageProcessingContext AddCaption(this IImageProcessingContext processingContext, string text, Color color, Color backgroundColor)
{
Size imgSize = processingContext.GetCurrentSize();
float defaultFontSize = 12;
float defaultResolution = 645;
float defaultPadding = 10;
float fontSize = imgSize.Width * defaultFontSize / defaultResolution;
float padding = imgSize.Width * defaultPadding / defaultResolution;
float captionWidth = imgSize.Width - (2 * padding);
FontCollection collection = new FontCollection();
FontFamily family = collection.Install("Roboto/Roboto-Regular.ttf");
Font font = family.CreateFont(fontSize, FontStyle.Regular);
// measure the text size
FontRectangle fontRectangle = TextMeasurer.Measure(text, new RendererOptions(font)
{
WrappingWidth = captionWidth
});
var location = new PointF(padding, imgSize.Height + padding);
var textGraphicOptions = new TextGraphicsOptions()
{
TextOptions = { WrapTextWidth = captionWidth }
};
var resizeOptions = new ResizeOptions()
{
// increse image height to include caption height
Size = new Size(imgSize.Width, imgSize.Height + (int)fontRectangle.Height + (int)(2 * padding)),
Mode = ResizeMode.BoxPad,
Position = AnchorPositionMode.Top
};
return(processingContext
.Resize(resizeOptions)
.BackgroundColor(backgroundColor)
.DrawText(textGraphicOptions, text, font, color, location));
}
protected override void ExecuteResizeOperation(IImageProcessingContext <Rgba32> ctx)
{
ctx.Resize(this.DestSize, this.DestSize, KnownResamplers.Bicubic);
}
private Matrix <float> ApplyStretchFit(IImageProcessingContext <Rgba32> context, Image <Rgba32> image)
{
context.Resize(image.Width, image.Height);
context.DrawImage(GraphicsOptions, image, new Point(0, 0));
return(GetProjectiveTransformationMatrix(image.Width, image.Height));
}