/// <summary>
/// 生成缩略图到MemoryStream
/// </summary>
/// <param name="SourceFile"></param>
/// <param name="intThumbWidth"></param>
/// <param name="intThumbHeight"></param>
/// <param name="gap">是否补足空白</param>
public static MemoryStream ThumbImageToStream(string SourceFile, int intThumbWidth, int intThumbHeight, bool gap = true)
{
MemoryStream ms = new MemoryStream();
//原图加载
using (System.DrawingCore.Image sourceImage = System.DrawingCore.Image.FromFile(SourceFile))
{
//是否显示原图
if (intThumbWidth == 0 && intThumbHeight == 0)
{
sourceImage.Save(ms, System.DrawingCore.Imaging.ImageFormat.Png);
return(ms);
}
//原图宽度和高度
int width = sourceImage.Width;
int height = sourceImage.Height;
int smallWidth;
int smallHeight;
//如果原图长宽均比缩略图的要小则返回原stream
if (width <= intThumbWidth && height <= intThumbHeight)
{
sourceImage.Save(ms, System.DrawingCore.Imaging.ImageFormat.Png);
return(ms);
}
//获取第一张绘制图的大小,(比较 原图的宽/缩略图的宽 和 原图的高/缩略图的高)
if (((decimal)width) / height <= ((decimal)intThumbWidth) / intThumbHeight)
{
smallWidth = intThumbHeight * width / height;
smallHeight = intThumbHeight;
}
else
{
smallWidth = intThumbWidth;
smallHeight = intThumbWidth * height / width;
}
Image newimg = sourceImage.GetThumbnailImage(smallWidth, smallHeight, null, IntPtr.Zero);
//使用原宽高比输出，不补足空白
if (!gap)
{
newimg.Save(ms, System.DrawingCore.Imaging.ImageFormat.Png);
return(ms);
}
//新建一个图板,以最小等比例压缩大小绘制原图
using (System.DrawingCore.Image bitmap = new System.DrawingCore.Bitmap(smallWidth, smallHeight))
{
//绘制中间图
using (System.DrawingCore.Graphics g = System.DrawingCore.Graphics.FromImage(bitmap))
{
//高清,平滑
g.InterpolationMode = System.DrawingCore.Drawing2D.InterpolationMode.High;
g.SmoothingMode = System.DrawingCore.Drawing2D.SmoothingMode.HighQuality;
g.Clear(Color.Transparent);
g.DrawImage(
sourceImage,
new System.DrawingCore.Rectangle(0, 0, smallWidth, smallHeight),
new System.DrawingCore.Rectangle(0, 0, width, height),
System.DrawingCore.GraphicsUnit.Pixel
);
}
//新建一个图板,以缩略图大小绘制中间图
using (System.DrawingCore.Image bitmap1 = new System.DrawingCore.Bitmap(intThumbWidth, intThumbHeight))
{
//绘制缩略图
using (System.DrawingCore.Graphics g = System.DrawingCore.Graphics.FromImage(bitmap1))
{
//高清,平滑
g.InterpolationMode = System.DrawingCore.Drawing2D.InterpolationMode.High;
g.SmoothingMode = System.DrawingCore.Drawing2D.SmoothingMode.HighQuality;
g.Clear(Color.Transparent);
int lwidth = (smallWidth - intThumbWidth) / 2;
int bheight = (smallHeight - intThumbHeight) / 2;
g.DrawImage(bitmap, new Rectangle(0, 0, intThumbWidth, intThumbHeight), lwidth, bheight, intThumbWidth, intThumbHeight, GraphicsUnit.Pixel);
g.Dispose();
bitmap1.Save(ms, System.DrawingCore.Imaging.ImageFormat.Png);
return(ms);
}
}
}
}
}
override internal void RunPage(Pages pgs, Row row)
{
Report r = pgs.Report;
bool bHidden = IsHidden(r, row);
WorkClass wc = GetWC(r);
string mtype = null;
Stream strm = null;
System.DrawingCore.Image im = null;
SetPagePositionBegin(pgs);
if (bHidden)
{
PageImage pi = new PageImage(ImageFormat.Jpeg, null, 0, 0);
this.SetPagePositionAndStyle(r, pi, row);
SetPagePositionEnd(pgs, pi.Y + pi.H);
return;
}
if (wc.PgImage != null)
{ // have we already generated this one
// reuse most of the work; only position will likely change
PageImage pi = new PageImage(wc.PgImage.ImgFormat, wc.PgImage.ImageData, wc.PgImage.SamplesW, wc.PgImage.SamplesH);
pi.Name = wc.PgImage.Name; // this is name it will be shared under
pi.Sizing = this._Sizing;
this.SetPagePositionAndStyle(r, pi, row);
pgs.CurrentPage.AddObject(pi);
SetPagePositionEnd(pgs, pi.Y + pi.H);
return;
}
try
{
strm = GetImageStream(r, row, out mtype);
if (strm == null)
{
r.rl.LogError(4, string.Format("Unable to load image {0}.", this.Name.Nm));
return;
}
im = System.DrawingCore.Image.FromStream(strm);
int height = im.Height;
int width = im.Width;
MemoryStream ostrm = new MemoryStream();
strm.Position = 0;
ImageFormat imf;
switch (mtype.ToLower())
{
case "image/jpeg":
imf = ImageFormat.Jpeg;
CopyStream(strm, ostrm);
break;
case "image/png":
imf = ImageFormat.Png;
CopyStream(strm, ostrm);
break;
default: // from old code where all images convert to jpeg, i don't know why. May be need delete it and add all support formats.
imf = ImageFormat.Jpeg;
System.DrawingCore.Imaging.ImageCodecInfo[] info;
info = ImageCodecInfo.GetImageEncoders();
EncoderParameters encoderParameters;
encoderParameters = new EncoderParameters(1);
encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, ImageQualityManager.EmbeddedImageQuality);
System.DrawingCore.Imaging.ImageCodecInfo codec = null;
for (int i = 0; i < info.Length; i++)
{
if (info[i].FormatDescription == "JPEG")
{
codec = info[i];
break;
}
}
im.Save(ostrm, codec, encoderParameters);
break;
}
byte[] ba = ostrm.ToArray();
ostrm.Close();
PageImage pi = new PageImage(imf, ba, width, height);
pi.Sizing = this._Sizing;
this.SetPagePositionAndStyle(r, pi, row);
pgs.CurrentPage.AddObject(pi);
if (_ConstantImage)
{
wc.PgImage = pi;
// create unique name; PDF generation uses this to optimize the saving of the image only once
pi.Name = "pi" + Interlocked.Increment(ref Parser.Counter).ToString(); // create unique name
}
SetPagePositionEnd(pgs, pi.Y + pi.H);
}
catch (Exception e)
{
// image failed to load, continue processing
r.rl.LogError(4, "Image load failed. " + e.Message);
}
finally
{
if (strm != null)
{
strm.Close();
}
if (im != null)
{
im.Dispose();
}
}
return;
}
/// <summary>
/// 增加图片文字水印
/// </summary>
/// <param name="filename">文件名</param>
/// <param name="watermarkText">水印文字</param>
/// <param name="watermarkStatus">图片水印位置</param>
public static void AddImageSignText(System.DrawingCore.Image img, string filename, string watermarkText, int watermarkStatus, int quality, string fontname, int fontsize)
{
Graphics g = Graphics.FromImage(img);
Font drawFont = new Font(fontname, fontsize, FontStyle.Regular, GraphicsUnit.Pixel);
SizeF crSize;
crSize = g.MeasureString(watermarkText, drawFont);
float xpos = 0;
float ypos = 0;
switch (watermarkStatus)
{
case 1:
xpos = (float)img.Width * (float).01;
ypos = (float)img.Height * (float).01;
break;
case 2:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = (float)img.Height * (float).01;
break;
case 3:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = (float)img.Height * (float).01;
break;
case 4:
xpos = (float)img.Width * (float).01;
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 5:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 6:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 7:
xpos = (float)img.Width * (float).01;
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
case 8:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
case 9:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
}
g.DrawString(watermarkText, drawFont, new SolidBrush(Color.White), xpos + 1, ypos + 1);
g.DrawString(watermarkText, drawFont, new SolidBrush(Color.Black), xpos, ypos);
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo ici = null;
foreach (ImageCodecInfo codec in codecs)
{
if (codec.MimeType.IndexOf("jpeg") > -1)
{
ici = codec;
}
}
EncoderParameters encoderParams = new EncoderParameters();
long[] qualityParam = new long[1];
if (quality < 0 || quality > 100)
{
quality = 80;
}
qualityParam[0] = quality;
EncoderParameter encoderParam = new EncoderParameter(System.DrawingCore.Imaging.Encoder.Quality, qualityParam);
encoderParams.Param[0] = encoderParam;
if (ici != null)
{
img.Save(filename, ici, encoderParams);
}
else
{
img.Save(filename);
}
g.Dispose();
img.Dispose();
}
