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MathanKumarVaradhaRajaPerumalMathanKumarVaradhaRajaPerumal
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Merge pull request #145 from SyncfusionExamples/Replace_EMF_Image
1042715 - Replace EMF with PNG in PowerPoint to PDF
2 parents 5029f91 + 36d1857 commit ef8eec4

1 file changed

Lines changed: 108 additions & 52 deletions

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  • PPTX-to-PDF-conversion/Replace-EMF-with-PNG-in-PowerPoint-to-PDF/.NET/Replace-EMF-with-PNG-in-PowerPoint-to-PDF

‎PPTX-to-PDF-conversion/Replace-EMF-with-PNG-in-PowerPoint-to-PDF/.NET/Replace-EMF-with-PNG-in-PowerPoint-to-PDF/Program.cs‎

Lines changed: 108 additions & 52 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
11
using Syncfusion.Presentation;
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using Syncfusion.PresentationRenderer;
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using Syncfusion.Pdf;
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using System.Drawing;
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using System.Drawing.Imaging;
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using Image = System.Drawing.Image;
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using ImageFormat = System.Drawing.Imaging.ImageFormat;
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@@ -83,31 +85,28 @@ public static void IterateShapes(IShapes shapes)
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{
8486
case SlideItemType.Picture:
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IPicture picture = shape as IPicture;
86-
87-
Image image = Image.FromStream(new MemoryStream(picture.ImageData));
88-
if (image.RawFormat.Equals(ImageFormat.Emf))
88+
if (picture.ImageData != null)
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{
90-
double height = picture.Height;
91-
double width = picture.Width;
92-
using (FileStream imgFile = new FileStream("Output.png", FileMode.OpenOrCreate, FileAccess.ReadWrite))
90+
Image image = Image.FromStream(new MemoryStream(picture.ImageData));
91+
if (image.RawFormat.Equals(ImageFormat.Emf))
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{
94-
image.Save(imgFile, ImageFormat.Png);
93+
// Store original properties
94+
double left = picture.Left;
95+
double top = picture.Top;
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double width = picture.Width;
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double height = picture.Height;
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// Convert EMF to PNG stream
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MemoryStream stream;
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stream = ConvertEmfToPng(picture.ImageData);
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// Add replacement picture
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IPicture newPicture = shapes.AddPicture(stream, left, top, width, height);
104+
newPicture.Left = left;
105+
newPicture.Top = top;
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// Remove original EMF picture
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shapes.Remove(picture);
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image.Dispose();
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}
97-
98-
using (FileStream imageStream = new FileStream(@"Output.png", FileMode.Open, FileAccess.ReadWrite))
99-
{
100-
//Creates instance for memory stream
101-
using (MemoryStream memoryStream = new MemoryStream())
102-
{
103-
//Copies stream to memoryStream.
104-
imageStream.CopyTo(memoryStream);
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//Replaces the existing image with new image.
106-
picture.ImageData = memoryStream.ToArray();
107-
picture.Height = height;
108-
picture.Width = width;
109-
}
110-
}
111110
}
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break;
113112
case SlideItemType.GroupShape:
@@ -126,23 +125,36 @@ public static void IterateShapes(IShapes shapes)
126125
Image fillImage = Image.FromStream(new MemoryStream(pictureFill.ImageBytes));
127126
if (fillImage.RawFormat.Equals(ImageFormat.Emf))
128127
{
129-
using (FileStream imgFile = new FileStream("Output.png", FileMode.OpenOrCreate, FileAccess.ReadWrite))
130-
{
131-
fillImage.Save(imgFile, ImageFormat.Png);
132-
fillImage.Dispose();
133-
}
134-
135-
using (FileStream imageStream = new FileStream(@"Output.png", FileMode.Open, FileAccess.ReadWrite))
136-
{
137-
//Creates instance for memory stream
138-
using (MemoryStream memoryStream = new MemoryStream())
139-
{
140-
//Copies stream to memoryStream.
141-
imageStream.CopyTo(memoryStream);
142-
//Replaces the existing image with new image.
143-
pictureFill.ImageBytes = memoryStream.ToArray();
144-
}
145-
}
128+
byte[] imageBytes = shape.Fill.PictureFill.ImageBytes;
129+
130+
using Image image = Image.FromStream(new MemoryStream(imageBytes));
131+
132+
// Process only EMF images
133+
if (image.RawFormat.Guid != ImageFormat.Emf.Guid)
134+
return;
135+
136+
// Convert EMF -> PNG
137+
using MemoryStream pngStream = ConvertEmfToPng(imageBytes);
138+
139+
// Save existing properties
140+
double left = shape.Left;
141+
double top = shape.Top;
142+
double width = shape.Width;
143+
double height = shape.Height;
144+
145+
// Create replacement shape
146+
IShape newShape = shapes.AddShape(shape.AutoShapeType, left, top, width, height);
147+
148+
// Apply PNG picture fill
149+
newShape.Fill.FillType = FillType.Picture;
150+
newShape.Fill.PictureFill.ImageBytes = pngStream.ToArray();
151+
152+
// Copy rotation
153+
newShape.Rotation = shape.Rotation;
154+
155+
// Remove original shape
156+
shapes.Remove(shape);
157+
146158
}
147159
}
148160
break;
@@ -157,38 +169,82 @@ public static void IterateShapes(IShapes shapes)
157169
double left = oleObject.Left;
158170
double top = oleObject.Top;
159171

160-
FileStream imgFile = new FileStream("Output.png", FileMode.OpenOrCreate, FileAccess.ReadWrite);
161-
oleImage.Save(imgFile, ImageFormat.Png);
162-
172+
// Convert preview image to PNG stream
173+
MemoryStream pngStream = new MemoryStream();
174+
oleImage.Save(pngStream, ImageFormat.Png);
175+
pngStream.Position = 0;
163176

164-
//Gets the data of Ole object.
165-
byte[] array = oleObject.ObjectData;
166-
//Convert Ole object data into memory system
167-
MemoryStream objectStream = new MemoryStream(array);
177+
// Get OLE data
178+
byte[] objectData = oleObject.ObjectData;
179+
MemoryStream objectStream = new MemoryStream(objectData);
168180

169-
//Gets the ProgID of OLE Object
181+
// Get ProgID
170182
string progID = oleObject.ProgID;
171183

172-
//Removed the existing OLE object.
184+
// Remove the existing OLE object
173185
shapes.Remove(oleObject);
174186

175-
//Add an new OLE object to the slide with PNG format image.
176-
IOleObject replacedOleObject = shapes.AddOleObject(imgFile, progID, objectStream);
177-
//Set size and position of the OLE object
187+
// Add a new OLE object with PNG preview image
188+
IOleObject replacedOleObject = shapes.AddOleObject(pngStream, progID, objectStream);
189+
190+
// Restore position and size
178191
replacedOleObject.Left = left;
179192
replacedOleObject.Top = top;
180193
replacedOleObject.Width = width;
181194
replacedOleObject.Height = height;
182195

183-
//Dispose all the instance.
184-
imgFile.Dispose();
196+
// Dispose
185197
objectStream.Dispose();
198+
pngStream.Dispose();
186199
oleImage.Dispose();
187200
}
188201

189202
break;
190203
}
191204
}
192205
}
206+
/// <summary>
207+
/// Convert EMF to PNG
208+
/// </summary>
209+
private static MemoryStream ConvertEmfToPng(byte[] emfBytes)
210+
{
211+
using MemoryStream emfStream = new MemoryStream(emfBytes);
212+
using Metafile metafile = new Metafile(emfStream);
213+
214+
GraphicsUnit pageUnit = GraphicsUnit.Pixel;
215+
RectangleF bounds = metafile.GetBounds(ref pageUnit);
216+
217+
int width = (int)Math.Ceiling(bounds.Width);
218+
int height = (int)Math.Ceiling(bounds.Height);
219+
220+
MemoryStream pngStream = new MemoryStream();
221+
222+
using (Bitmap bitmap = new Bitmap(width, height))
223+
{
224+
bitmap.SetResolution(300, 300);
225+
226+
using (Graphics graphics = Graphics.FromImage(bitmap))
227+
{
228+
graphics.Clear(Color.Transparent);
229+
230+
graphics.SmoothingMode =
231+
System.Drawing.Drawing2D.SmoothingMode.HighQuality;
232+
graphics.InterpolationMode =
233+
System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
234+
graphics.PixelOffsetMode =
235+
System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
236+
237+
graphics.DrawImage(
238+
metafile,
239+
new Rectangle(0, 0, width, height));
240+
}
241+
242+
bitmap.Save(pngStream, ImageFormat.Png);
243+
}
244+
245+
pngStream.Position = 0;
246+
return pngStream;
247+
248+
}
193249
}
194250
}

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