public override object CreateImageBuilder (int width, int height, ImageFormat format)
{
var flags = CGBitmapFlags.ByteOrderDefault;
int bytesPerRow;
switch (format) {
case ImageFormat.ARGB32:
bytesPerRow = width * 4;
flags |= CGBitmapFlags.PremultipliedFirst;
break;
case ImageFormat.RGB24:
bytesPerRow = width * 3;
flags |= CGBitmapFlags.None;
break;
default:
throw new NotImplementedException ("ImageFormat: " + format.ToString ());
}
var bmp = new CGBitmapContext (IntPtr.Zero, width, height, 8, bytesPerRow, Util.DeviceRGBColorSpace, flags);
bmp.TranslateCTM (0, height);
bmp.ScaleCTM (1, -1);
return new CGContextBackend {
Context = bmp,
Size = new CGSize (width, height),
InverseViewTransform = bmp.GetCTM ().Invert ()
};
}
internal static void NativeDrawString (CGBitmapContext bitmapContext, string s, CTFont font, CCColor4B brush, CGRect layoutRectangle)
{
if (font == null)
throw new ArgumentNullException ("font");
if (s == null || s.Length == 0)
return;
bitmapContext.ConcatCTM (bitmapContext.GetCTM().Invert());
// This is not needed here since the color is set in the attributed string.
//bitmapContext.SetFillColor(brush.R/255f, brush.G/255f, brush.B/255f, brush.A/255f);
// I think we only Fill the text with no Stroke surrounding
//bitmapContext.SetTextDrawingMode(CGTextDrawingMode.Fill);
var attributedString = buildAttributedString(s, font, brush);
// Work out the geometry
CGRect insetBounds = layoutRectangle;
CGPoint textPosition = new CGPoint(insetBounds.X,
insetBounds.Y);
float boundsWidth = (float)insetBounds.Width;
// Calculate the lines
nint start = 0;
nint length = attributedString.Length;
var typesetter = new CTTypesetter(attributedString);
float baselineOffset = 0;
// First we need to calculate the offset for Vertical Alignment if we
// are using anything but Top
if (vertical != CCVerticalTextAlignment.Top) {
while (start < length) {
nint count = typesetter.SuggestLineBreak((int)start, (double)boundsWidth);
var line = typesetter.GetLine (new NSRange(start, count));
// Create and initialize some values from the bounds.
nfloat ascent;
nfloat descent;
nfloat leading;
line.GetTypographicBounds(out ascent, out descent, out leading);
baselineOffset += (float)Math.Ceiling ((float)(ascent + descent + leading + 1)); // +1 matches best to CTFramesetter's behavior
line.Dispose ();
start += count;
}
}
start = 0;
while (start < length && textPosition.Y < insetBounds.Bottom)
{
// Now we ask the typesetter to break off a line for us.
// This also will take into account line feeds embedded in the text.
// Example: "This is text \n with a line feed embedded inside it"
nint count = typesetter.SuggestLineBreak((int)start, (double)boundsWidth);
var line = typesetter.GetLine(new NSRange(start, count));
// Create and initialize some values from the bounds.
nfloat ascent;
nfloat descent;
nfloat leading;
line.GetTypographicBounds(out ascent, out descent, out leading);
// Calculate the string format if need be
var penFlushness = 0.0f;
if (horizontal == CCTextAlignment.Right)
penFlushness = (float)line.GetPenOffsetForFlush(1.0f, boundsWidth);
else if (horizontal == CCTextAlignment.Center)
penFlushness = (float)line.GetPenOffsetForFlush(0.5f, boundsWidth);
// initialize our Text Matrix or we could get trash in here
var textMatrix = CGAffineTransform.MakeIdentity();
if (vertical == CCVerticalTextAlignment.Top)
textMatrix.Translate(penFlushness, insetBounds.Height - textPosition.Y -(float)Math.Floor(ascent - 1));
if (vertical == CCVerticalTextAlignment.Center)
textMatrix.Translate(penFlushness, ((insetBounds.Height / 2) + (baselineOffset / 2)) - textPosition.Y -(float)Math.Floor(ascent - 1));
if (vertical == CCVerticalTextAlignment.Bottom)
textMatrix.Translate(penFlushness, baselineOffset - textPosition.Y -(float)Math.Floor(ascent - 1));
// Set our matrix
bitmapContext.TextMatrix = textMatrix;
// and draw the line
line.Draw(bitmapContext);
// Move the index beyond the line break.
start += count;
textPosition.Y += (float)Math.Ceiling(ascent + descent + leading + 1); // +1 matches best to CTFramesetter's behavior
line.Dispose();
}
}
public override object ConvertToBitmap(object handle, double width, double height, double scaleFactor, ImageFormat format)
{
int pixelWidth = (int)(width * scaleFactor);
int pixelHeight = (int)(height * scaleFactor);
if (handle is CustomImage) {
var flags = CGBitmapFlags.ByteOrderDefault;
int bytesPerRow;
switch (format) {
case ImageFormat.ARGB32:
bytesPerRow = pixelWidth * 4;
flags |= CGBitmapFlags.PremultipliedFirst;
break;
case ImageFormat.RGB24:
bytesPerRow = pixelWidth * 3;
flags |= CGBitmapFlags.None;
break;
default:
throw new NotImplementedException ("ImageFormat: " + format.ToString ());
}
var bmp = new CGBitmapContext (IntPtr.Zero, pixelWidth, pixelHeight, 8, bytesPerRow, Util.DeviceRGBColorSpace, flags);
bmp.TranslateCTM (0, pixelHeight);
bmp.ScaleCTM ((float)scaleFactor, (float)-scaleFactor);
var ctx = new CGContextBackend {
Context = bmp,
Size = new SizeF ((float)width, (float)height),
InverseViewTransform = bmp.GetCTM ().Invert (),
ScaleFactor = scaleFactor
};
var ci = (CustomImage)handle;
ci.DrawInContext (ctx);
var img = new NSImage (((CGBitmapContext)bmp).ToImage (), new SizeF (pixelWidth, pixelHeight));
var imageData = img.AsTiff ();
var imageRep = (NSBitmapImageRep)NSBitmapImageRep.ImageRepFromData (imageData);
var im = new NSImage ();
im.AddRepresentation (imageRep);
im.Size = new SizeF ((float)width, (float)height);
bmp.Dispose ();
return im;
}
else {
NSImage img = (NSImage)handle;
NSBitmapImageRep bitmap = img.Representations ().OfType<NSBitmapImageRep> ().FirstOrDefault ();
if (bitmap == null) {
var imageData = img.AsTiff ();
var imageRep = (NSBitmapImageRep)NSBitmapImageRep.ImageRepFromData (imageData);
var im = new NSImage ();
im.AddRepresentation (imageRep);
im.Size = new SizeF ((float)width, (float)height);
return im;
}
return handle;
}
}
public override object ConvertToBitmap(object handle, int pixelWidth, int pixelHeight, ImageFormat format)
{
if (handle is CustomImage) {
var flags = CGBitmapFlags.ByteOrderDefault;
int bytesPerRow;
switch (format) {
case ImageFormat.ARGB32:
bytesPerRow = pixelWidth * 4;
flags |= CGBitmapFlags.PremultipliedFirst;
break;
case ImageFormat.RGB24:
bytesPerRow = pixelWidth * 3;
flags |= CGBitmapFlags.None;
break;
default:
throw new NotImplementedException ("ImageFormat: " + format.ToString ());
}
var bmp = new CGBitmapContext (IntPtr.Zero, pixelWidth, pixelHeight, 8, bytesPerRow, Util.DeviceRGBColorSpace, flags);
bmp.TranslateCTM (0, pixelHeight);
bmp.ScaleCTM (1, -1);
var ctx = new CGContextBackend {
Context = bmp,
Size = new SizeF (pixelWidth, pixelHeight),
InverseViewTransform = bmp.GetCTM ().Invert ()
};
var ci = (CustomImage)handle;
ci.DrawInContext (ctx);
var img = new NSImage (((CGBitmapContext)bmp).ToImage (), new SizeF (pixelWidth, pixelHeight));
var imageData = img.AsTiff ();
var imageRep = (NSBitmapImageRep) NSBitmapImageRep.ImageRepFromData (imageData);
var im = new NSImage ();
im.AddRepresentation (imageRep);
return im;
}
else
return handle;
}
