/// <summary>
/// See base docs.
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="mode"></param>
/// <param name="zoomBackground"></param>
/// <param name="preferSpeedOverQuality"></param>
/// <returns></returns>
public override VrsDrawing.IImage Resize(int width, int height, VrsDrawing.ResizeMode mode = VrsDrawing.ResizeMode.Normal, VrsDrawing.IBrush zoomBackground = null, bool preferSpeedOverQuality = true)
{
var result = new Bitmap(width, height, PixelFormat.Format32bppArgb);
var zoomBackgroundBrushWrapper = zoomBackground as BrushWrapper;
GdiPlusLock.EnforceSingleThread(() => {
using (var graphics = Graphics.FromImage(result)) {
graphics.SmoothingMode = SmoothingMode.AntiAlias;
graphics.InterpolationMode = preferSpeedOverQuality ? InterpolationMode.Bicubic : InterpolationMode.HighQualityBicubic;
graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
var newWidth = width;
var newHeight = height;
var left = 0;
var top = 0;
if (mode != VrsDrawing.ResizeMode.Stretch)
{
var widthPercent = (double)newWidth / (double)NativeImage.Width;
var heightPercent = (double)newHeight / (double)NativeImage.Height;
switch (mode)
{
case VrsDrawing.ResizeMode.Zoom:
// Resize the longest side by the smallest percentage
graphics.FillRectangle(zoomBackgroundBrushWrapper.NativeBrush, 0, 0, result.Width, result.Height);
if (widthPercent > heightPercent)
{
newWidth = Math.Min(newWidth, (int)(((double)NativeImage.Width * heightPercent) + 0.5));
}
else if (heightPercent > widthPercent)
{
newHeight = Math.Min(newHeight, (int)(((double)NativeImage.Height * widthPercent) + 0.5));
}
break;
case VrsDrawing.ResizeMode.Normal:
case VrsDrawing.ResizeMode.Centre:
// Resize the smallest side by the largest percentage
if (widthPercent > heightPercent)
{
newHeight = Math.Max(newHeight, (int)(((double)NativeImage.Height * widthPercent) + 0.5));
}
else if (heightPercent > widthPercent)
{
newWidth = Math.Max(newWidth, (int)(((double)NativeImage.Width * heightPercent) + 0.5));
}
break;
}
if (mode != VrsDrawing.ResizeMode.Normal)
{
left = (width - newWidth) / 2;
top = (height - newHeight) / 2;
}
}
graphics.DrawImage(NativeImage, left, top, newWidth, newHeight);
}
});
return(new ImageWrapper(result));
}
/// <summary> /// See interface docs. /// </summary> /// <param name="width"></param> /// <param name="height"></param> /// <param name="mode"></param> /// <param name="zoomBackground"></param> /// <param name="preferSpeedOverQuality"></param> /// <returns></returns> public abstract VrsDrawing.IImage Resize(int width, int height, VrsDrawing.ResizeMode mode = VrsDrawing.ResizeMode.Normal, VrsDrawing.IBrush zoomBackground = null, bool preferSpeedOverQuality = true);