GlyphBitmap GetGlyphBitmapFromSvg(ushort glyphIndex)
{
//TODO: use string builder from pool?
var stbuilder = new System.Text.StringBuilder();
_typeface.ReadSvgContent(glyphIndex, stbuilder);
float target_advW = _typeface.GetAdvanceWidthFromGlyphIndex(glyphIndex) * _px_scale;
var req = new PixelFarm.Drawing.SvgBmpBuilderReq
{
SvgContent = stbuilder,
DefaultBgColor = Color.Transparent,
ExpectedWidth = target_advW
};
_svgBmpBuilderFunc.Invoke(req);
MemBitmap memBmp = req.Output;
if (memBmp == null)
{
//TODO: use blank img?
return(null);
}
//TODO... review this again
short offset_x = (short)req.BitmapXOffset;
short offset_y = (short)req.BitmapYOffset;
return(new GlyphBitmap
{
Bitmap = memBmp,
Width = memBmp.Width,
Height = memBmp.Height,
ImageStartX = -offset_x, //offset back
ImageStartY = -offset_y //offset back
});
}
public static void ParseAndRenderSvg(PixelFarm.Drawing.SvgBmpBuilderReq req)
{
//----------
//copy from HtmlRenderer's SvgViewer demo
//----------
var docBuilder = new VgDocBuilder();
var parser = new SvgParser(docBuilder);
TextSnapshot textSnapshot = new TextSnapshot(req.SvgContent.ToString());
parser.ParseDocument(textSnapshot);
VgVisualDocBuilder builder = new VgVisualDocBuilder();
VgVisualElement vgVisElem = builder.CreateVgVisualDoc(docBuilder.ResultDocument, _vgDocHost).VgRootElem;
PixelFarm.CpuBlit.VertexProcessing.Q1RectD bounds = vgVisElem.GetRectBounds();
float actualXOffset = (float)-bounds.Left;
float actualYOffset = (float)-bounds.Bottom;
//original svg width, height
int bmpW = (int)Math.Round(bounds.Width);
int bmpH = (int)Math.Round(bounds.Height);
if (bmpW == 0 || bmpH == 0)
{
return;
}
//scale svg to specific size
float scale_w = req.ExpectedWidth / bmpW;
//at this point, we have 2 options
//1) create bitmap with original svg size and scale it down to expected size
//2) scale svg to expected size and create a bitmap
//we choose 2)
int new_w = (int)Math.Round(bmpW * scale_w);
int new_h = (int)Math.Round(bmpH * scale_w);
MemBitmap memBitmap = new MemBitmap(new_w, new_h);
using (Tools.BorrowAggPainter(memBitmap, out var p))
using (Tools.More.BorrowVgPaintArgs(p, out VgPaintArgs paintArgs))
{
//pass by
Affine tx = Affine.NewScaling(scale_w);
paintArgs._currentTx = tx;
float orgX = p.OriginX;
float orgY = p.OriginY;
p.SetOrigin(actualXOffset * scale_w, actualYOffset * scale_w);
p.Clear(req.DefaultBgColor);
p.FillColor = PixelFarm.Drawing.Color.Black;
double prevStrokeW = p.StrokeWidth;
vgVisElem.Paint(paintArgs);
p.StrokeWidth = prevStrokeW; //restore
p.SetOrigin(orgX, orgY); //restore
}
#if DEBUG
//memBitmap.SaveImage("svg.png");
#endif
req.Output = memBitmap;
}
