private void DrawTextWatermark(IBitmapList bitmaps)
{
if (string.IsNullOrEmpty(Options.Watermark.Text))
{
throw new ArgumentException("The text watermark cannot be empty.");
}
var count = 1;
foreach (var bitmap in bitmaps)
{
bitmap.AppendSaveAsSuffix(Options.Watermark.FileNameSuffix);
var realBitmap = (SKBitmap)bitmap.Source;
using (var canvas = new SKCanvas(realBitmap))
{
var imageSize = new Size(realBitmap.Width, realBitmap.Height);
var coord = ImageHelper.CalculateCoord(imageSize,
Options.Watermark.InitialCoord, Options.Watermark.IsRandomCoord);
canvas.DrawText(Options.Watermark.Text, coord.X, coord.Y,
count.IsMultiples(2) ? _alternPaint : _forePaint);
count++;
}
}
}
protected override IBitmapList DrawCore(IBitmapList bitmaps)
{
var baseDirectory = SaveSubpathFunc(Clock).SetBasePath(Options.ImageDirectory);
baseDirectory.CreateDirectory();
foreach (var bitmap in bitmaps)
{
var realBitmap = (SKBitmap)bitmap.Source;
using (var image = SKImage.FromBitmap(realBitmap))
using (var data = image.Encode(ImageFormat, Options.EncodeQuality))
{
// 文件基础名+另存为后缀+文件格式名，如：6123xxxx-suffix.jpeg
var fileName = SaveFileBaseNameFunc(Clock, bitmap)
+ bitmap.SaveAsSuffix + Options.ImageFormat.Leading('.');
bitmap.SaveAsPath = baseDirectory.CombinePath(fileName);
using (var fs = new FileStream(bitmap.SaveAsPath, FileMode.OpenOrCreate))
{
data.SaveTo(fs);
}
}
}
return(bitmaps);
}
protected override IBitmapList DrawCore(IBitmapList bitmaps)
{
if (Options.Scale.Descriptors.Count < 1)
{
return(bitmaps);
}
var scaleBitmaps = new BitmapList();
var watermarkBitmaps = new BitmapList();
foreach (var bitmap in bitmaps)
{
var realBitmap = (SKBitmap)bitmap.Source;
// 遍历缩放信息
foreach (var scaleDescriptor in Options.Scale.Descriptors)
{
// 如果源图尺寸小于缩放尺寸，则跳过当前缩放信息
if (realBitmap.Width <= scaleDescriptor.MaxSize.Width &&
realBitmap.Height <= scaleDescriptor.MaxSize.Height)
{
continue;
}
// 计算等比例缩放尺寸
var imageSize = new Size(realBitmap.Width, realBitmap.Height);
var scaleSize = ImageHelper.ScaleSize(imageSize, scaleDescriptor.MaxSize);
var scaleInfo = new SKImageInfo(scaleSize.Width, scaleSize.Height,
realBitmap.Info.ColorType, realBitmap.Info.AlphaType);
// 是否附加缩放尺寸后缀
var scaleNameFuffix = scaleDescriptor.FileNameSuffix;
if (Options.Scale.AddScaleSizeSuffix)
{
scaleNameFuffix += $"-{scaleSize.Width}x{scaleSize.Height}";
}
// 创建缩放位图描述符
var scaleBitmap = realBitmap.Resize(scaleInfo, Options.ResizeQuality);
var descriptor = new BitmapDescriptor(scaleBitmap, bitmap.FilePath,
scaleNameFuffix);
scaleBitmaps.Add(descriptor);
if (scaleDescriptor.AddWatermark)
{
watermarkBitmaps.Add(descriptor);
}
}
}
// 处理缩放位图集合的水印
if (watermarkBitmaps.Count > 0)
{
_watermarkDrawer.Draw(watermarkBitmaps);
}
return(scaleBitmaps);
}
/// <summary>
/// 绘制位图列表。
/// </summary>
/// <param name="bitmaps">给定的 <see cref="IBitmapList"/>。</param>
/// <returns>返回 <see cref="IBitmapList"/>。</returns>
public virtual IBitmapList Draw(IBitmapList bitmaps)
{
if (bitmaps.Count > 0)
{
return(DrawCore(bitmaps));
}
return(bitmaps);
}
protected override IBitmapList DrawCore(IBitmapList bitmaps)
{
if (Options.Watermark.Mode is WatermarkMode.Image && _watermarkBitmap is not null)
{
DrawImageWatermark(bitmaps);
}
else
{
DrawTextWatermark(bitmaps);
}
return(bitmaps);
}
private void DrawImageWatermark(IBitmapList bitmaps)
{
foreach (var bitmap in bitmaps)
{
bitmap.AppendSaveAsSuffix(Options.Watermark.FileNameSuffix);
var realBitmap = (SKBitmap)bitmap.Source;
using (var canvas = new SKCanvas(realBitmap))
{
var imageSize = new Size(realBitmap.Width, realBitmap.Height);
var coord = ImageHelper.CalculateCoord(imageSize,
Options.Watermark.InitialCoord, Options.Watermark.IsRandomCoord);
// 绘制图像水印
canvas.DrawBitmap(_watermarkBitmap, coord.X, coord.Y);
}
}
}
/// <summary> /// 绘制位图列表核心。 /// </summary> /// <param name="bitmaps">给定的 <see cref="IBitmapList"/>。</param> /// <returns>返回 <see cref="IBitmapList"/>。</returns> protected abstract IBitmapList DrawCore(IBitmapList bitmaps);
