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226 lines (197 loc) · 8.07 KB
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using System;
using System.IO;
using SharpImage;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
using A = DocumentFormat.OpenXml.Drawing;
using DW = DocumentFormat.OpenXml.Drawing.Wordprocessing;
using PIC = DocumentFormat.OpenXml.Drawing.Pictures;
namespace SharpDocx
{
public static class ImageHelper
{
public static Drawing CreateDrawing(
WordprocessingDocument package,
Stream imageStream,
PartTypeInfo imagePartType,
int percentage, long maxWidthInEmus)
{
var imagePart = package.MainDocumentPart.AddImagePart(imagePartType);
ImageInfoBase imageInfo = null;
using (imageStream)
{
var type = GetImageType(imagePartType);
imageInfo = ImageInfo.GetInfo(type, imageStream);
if (imageInfo == null)
{
throw new ArgumentException("Unsupported image format.");
}
imageStream.Seek(0, SeekOrigin.Begin);
imagePart.FeedData(imageStream);
// imagePart will also dispose the stream.
}
var widthPx = imageInfo.Width;
var heightPx = imageInfo.Height;
var horzRezDpi = imageInfo.DpiH;
var vertRezDpi = imageInfo.DpiV;
const int emusPerInch = 914400;
var widthEmus = (long)widthPx * emusPerInch / horzRezDpi;
var heightEmus = (long)heightPx * emusPerInch / vertRezDpi;
if (widthEmus > maxWidthInEmus)
{
var ratio = heightEmus * 1.0m / widthEmus;
widthEmus = maxWidthInEmus;
heightEmus = (long)(widthEmus * ratio);
}
if (percentage != 100)
{
widthEmus = widthEmus * percentage / 100;
heightEmus = heightEmus * percentage / 100;
}
var drawing = GetDrawing(package.MainDocumentPart.GetIdOfPart(imagePart), widthEmus, heightEmus);
return drawing;
}
internal static PartTypeInfo GetImagePartType(string extension)
{
if (extension == null)
{
throw new ArgumentException("Unknown extension", nameof(extension));
}
PartTypeInfo? type = null;
extension = extension.Replace(".", "").ToLower();
switch (extension)
{
case "bmp":
type = ImagePartType.Bmp;
break;
case "emf": // untested
type = ImagePartType.Emf;
break;
case "gif":
type = ImagePartType.Gif;
break;
case "ico": // untested
case "icon":
type = ImagePartType.Icon;
break;
case "jpg":
case "jpeg":
type = ImagePartType.Jpeg;
break;
case "pcx": // untested
type = ImagePartType.Pcx;
break;
case "png":
type = ImagePartType.Png;
break;
case "tif":
case "tiff":
type = ImagePartType.Tiff;
break;
case "wmf":
type = ImagePartType.Wmf;
break;
}
if (type == null)
{
throw new ArgumentException("Unknown extension", nameof(extension));
}
return type.Value;
}
internal static ImageType GetImageType(PartTypeInfo imagePartType)
{
switch (imagePartType)
{
case PartTypeInfo part when part == ImagePartType.Bmp:
return ImageType.Bmp;
case PartTypeInfo part when part == ImagePartType.Gif:
return ImageType.Gif;
case PartTypeInfo part when part == ImagePartType.Jpeg:
return ImageType.Jpeg;
case PartTypeInfo part when part == ImagePartType.Png:
return ImageType.Png;
case PartTypeInfo part when part == ImagePartType.Tiff:
return ImageType.Tiff;
case PartTypeInfo part when part == ImagePartType.Emf:
return ImageType.Emf;
}
return ImageType.Unknown;
}
internal static PartTypeInfo? GetImagePartType(ImageType imageType)
{
switch (imageType)
{
case ImageType.Bmp:
return ImagePartType.Bmp;
case ImageType.Gif:
return ImagePartType.Gif;
case ImageType.Jpeg:
return ImagePartType.Jpeg;
case ImageType.Png:
return ImagePartType.Png;
case ImageType.Tiff:
return ImagePartType.Tiff;
case ImageType.Emf:
return ImagePartType.Emf;
}
return null;
}
private static Drawing GetDrawing(string relationshipId, long widthEmus, long heightEmus)
{
return new Drawing(
new DW.Inline(
new DW.Extent { Cx = widthEmus, Cy = heightEmus },
new DW.EffectExtent
{
LeftEdge = 0L,
TopEdge = 0L,
RightEdge = 0L,
BottomEdge = 0L
},
new DW.DocProperties
{
Id = 1,
Name = "Picture 1"
},
new DW.NonVisualGraphicFrameDrawingProperties(
new A.GraphicFrameLocks { NoChangeAspect = true }),
new A.Graphic(
new A.GraphicData(
new PIC.Picture(
new PIC.NonVisualPictureProperties(
new PIC.NonVisualDrawingProperties
{
Id = 0,
Name = "New Bitmap Image.png"
},
new PIC.NonVisualPictureDrawingProperties()),
new PIC.BlipFill(
new A.Blip(
new A.BlipExtensionList(
new A.BlipExtension { Uri = "{28A0092B-C50C-407E-A947-70E740481C1C}" }))
{
Embed = relationshipId,
CompressionState = A.BlipCompressionValues.Print
},
new A.Stretch(
new A.FillRectangle())),
new PIC.ShapeProperties(
new A.Transform2D(
new A.Offset { X = 0, Y = 0 },
new A.Extents { Cx = widthEmus, Cy = heightEmus }),
new A.PresetGeometry(
new A.AdjustValueList())
{Preset = A.ShapeTypeValues.Rectangle}))
)
{ Uri = "http://schemas.openxmlformats.org/drawingml/2006/picture" })
)
{
DistanceFromTop = 0,
DistanceFromBottom = 0,
DistanceFromLeft = 0,
DistanceFromRight = 0,
EditId = "50D07946"
});
}
}
}