private void SaveThumbnail(CreateBackgroundModel model, string thumbnailPath)
{
var sourceImage = new KalikoImage(model.File.OpenReadStream());
var fitScaling = new FitScaling(192, 108);
var image = fitScaling.Scale(sourceImage);
image.SavePng($"{_appEnvironment.WebRootPath}{thumbnailPath}");
}
private void AddWaterMarking(WaterMarkingPosition?position, string waterMarkingPath, KalikoImage imageThumb)
{
if (!position.HasValue || string.IsNullOrEmpty(waterMarkingPath))
{
return;
}
//需要打上水印
var waterMarkingImgage = new KalikoImage(waterMarkingPath);
var waterMarkingWidth = (int)(imageThumb.Width / 4.8);
var waterMarkingHeight = (int)(waterMarkingImgage.Height * waterMarkingWidth / waterMarkingImgage.Width);
var waterScalingBase = new FitScaling(waterMarkingWidth, waterMarkingHeight);
var waterThumb = waterMarkingImgage.Scale(waterScalingBase);
//计算距离
var waterX = 0;
var waterY = 0;
const int edgeWidth = 40;
switch (position.Value)
{
case WaterMarkingPosition.Center:
waterX = (imageThumb.Width - waterThumb.Width) / 2;
waterY = (imageThumb.Height - waterThumb.Height) / 2;
break;
case WaterMarkingPosition.LeftBottom:
waterX = edgeWidth;
waterY = imageThumb.Height - waterThumb.Height - edgeWidth;
break;
case WaterMarkingPosition.LeftTop:
waterX = edgeWidth;
waterY = edgeWidth;
break;
case WaterMarkingPosition.RightBottom:
waterX = imageThumb.Width - waterThumb.Width - edgeWidth;
waterY = imageThumb.Height - waterThumb.Height - edgeWidth;
break;
case WaterMarkingPosition.RightTop:
waterX = imageThumb.Width - waterThumb.Width - edgeWidth;
waterY = edgeWidth;
break;
}
imageThumb.BlitImage(waterThumb, waterX, waterY);
}
public KalikoImage GetThumbnailImage(int width, int height, ThumbnailMethod method)
{
ScalingBase scaleEngine;
switch (method)
{
case ThumbnailMethod.Fit:
scaleEngine = new FitScaling(width, height);
break;
case ThumbnailMethod.Pad:
scaleEngine = new PadScaling(width, height);
break;
default:
scaleEngine = new CropScaling(width, height);
break;
}
return(Scale(scaleEngine));
}
/// <summary>
/// 缩略图的截图模式是：当原图宽高比按照缩略图时缩放
/// </summary>
/// <param name="originalImagePath"></param>
/// <param name="thumbnailPath"></param>
/// <param name="extName"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="scale">Crop:取中间部分;Fit:按比例缩放，自动调整尺寸;Pad:按比例缩放，保持尺寸，不足部分填白</param>
/// <param name="position">水印位置</param>
/// <param name="waterMarkingPath">水印图片路劲</param>
public void MakeThumbnail(string originalImagePath, string thumbnailPath, string extName, int width, int height, ThumbnailMethod scale = ThumbnailMethod.Fit, WaterMarkingPosition?position = null, string waterMarkingPath = "")
{
if (!File.Exists(originalImagePath))
{
return;
}
var image = new KalikoImage(originalImagePath)
{
BackgroundColor = Color.White
};
var format = GetImageFormat(extName);
ScalingBase scalingBase = null;
switch (scale)
{
case ThumbnailMethod.Crop:
scalingBase = new CropScaling(width, height);
break;
case ThumbnailMethod.Fit:
scalingBase = new FitScaling(width, height);
break;
case ThumbnailMethod.Pad:
scalingBase = new PadScaling(width, height);
break;
default:
scalingBase = new CropScaling(width, height);
break;
}
var imageThumb = image.Scale(scalingBase);
AddWaterMarking(position, waterMarkingPath, imageThumb);
imageThumb.SaveImage(thumbnailPath, format);
image.Dispose();
imageThumb.Dispose();
}
public KalikoImage GetThumbnailImage(int width, int height, ThumbnailMethod method) {
ScalingBase scaleEngine;
switch (method) {
case ThumbnailMethod.Fit:
scaleEngine = new FitScaling(width, height);
break;
case ThumbnailMethod.Pad:
scaleEngine = new PadScaling(width, height);
break;
default:
scaleEngine = new CropScaling(width, height);
break;
}
return Scale(scaleEngine);
}