public void DrawImageAlpha(float alpha, AbstractImage image, RectangleF targetRect)
{
if (alpha <= 0)
{
return;
}
if (alpha >= 1)
{
DrawImage(image, targetRect.X, targetRect.Y, targetRect.Width, targetRect.Height);
return;
}
Image gdiImage = image.Image;
lock (gdiImage)
{
ColorMatrix matrix = new ColorMatrix();
matrix.Matrix00 = matrix.Matrix11 = matrix.Matrix22 = 1;
matrix.Matrix33 = alpha;
ImageAttributes attr = new ImageAttributes();
attr.SetColorMatrix(matrix);
PointF[] dest = new PointF[]
{
new PointF(targetRect.Left, targetRect.Top),
new PointF(targetRect.Right, targetRect.Top),
new PointF(targetRect.Left, targetRect.Bottom)
};
g.DrawImage(gdiImage, dest, new RectangleF(0, 0, gdiImage.Width, gdiImage.Height), GraphicsUnit.Pixel, attr);
}
}
public void DrawImage(AbstractImage image, float x, float y, float width, float height)
{
var e = Append(new Element(ElementNames.IMAGE));
e.Set("x", x);
e.Set("y", y);
e.Set("width", width);
e.Set("height", height);
e.Set("xlink:href", image.Url);
}
public void DrawImageAlpha(float alpha, AbstractImage image, RectangleF targetRect)
{
var e = Append(new Element(ElementNames.IMAGE));
e.Set("x", targetRect.X);
e.Set("y", targetRect.Y);
e.Set("width", targetRect.Width);
e.Set("height", targetRect.Height);
e.Set("opacity", alpha);
e.Set("xlink:href", image.Url);
}
public void DrawImage(AbstractImage image, float x, float y, float width, float height)
{
g.DrawImage(image.Image, x, y, width, height);
}
public void DrawImageAlpha(float alpha, AbstractImage mimage, RectangleF targetRect)
{
// Clamp and Quantize
alpha = Util.Clamp(alpha, 0f, 1f);
alpha = (float)Math.Round(alpha * 16f) / 16f;
if (alpha <= 0f)
{
return;
}
if (alpha >= 1f)
{
g.DrawImage(mimage.XImage, targetRect);
return;
}
int key = (int)Math.Round(alpha * 16);
Image image = mimage.Image;
XImage ximage;
int w, h;
lock (image)
{
w = image.Width;
h = image.Height;
if (image.Tag == null || !(image.Tag is Dictionary <int, XImage>))
{
image.Tag = new Dictionary <int, XImage>();
}
Dictionary <int, XImage> dict = image.Tag as Dictionary <int, XImage>;
if (dict.ContainsKey(key))
{
ximage = dict[key];
}
else
{
// Need to construct a new image (PdfSharp can't alpha-render images)
// Memoize these in the image itself, since most requests will be from
// a small set
Bitmap scratchBitmap = new Bitmap(w, h, PixelFormat.Format32bppArgb);
using (var scratchGraphics = Graphics.FromImage(scratchBitmap))
{
ColorMatrix matrix = new ColorMatrix();
matrix.Matrix00 = matrix.Matrix11 = matrix.Matrix22 = 1;
matrix.Matrix33 = alpha;
ImageAttributes attr = new ImageAttributes();
attr.SetColorMatrix(matrix);
scratchGraphics.DrawImage(image, new Rectangle(0, 0, w, h), 0, 0, w, h, GraphicsUnit.Pixel, attr);
}
ximage = XImage.FromGdiPlusImage(scratchBitmap);
dict[key] = ximage;
}
}
lock (ximage)
{
g.DrawImage(ximage, targetRect);
}
}
