public void DrawString(char[] text, int startAt, int len, double x, double y)
{
if (this.UseSubPixelRendering)
{
//1. clear prev drawing result
_aggPainter.Clear(Drawing.Color.FromArgb(0, 0, 0, 0));
//aggPainter.Clear(Drawing.Color.White);
//aggPainter.Clear(Drawing.Color.FromArgb(0, 0, 0, 0));
//2. print text span into Agg Canvas
_vxsTextPrinter.DrawString(text, startAt, len, 0, 0);
//3.copy to gl bitmap
//byte[] buffer = PixelFarm.Agg.ActualImage.GetBuffer(_actualImage);
//------------------------------------------------------
GLBitmap glBmp = new GLBitmap(_actualImage);
glBmp.IsInvert = false;
//TODO: review font height
if (StartDrawOnLeftTop)
{
y -= _vxsTextPrinter.FontLineSpacingPx;
}
_glsx.DrawGlyphImageWithSubPixelRenderingTechnique(glBmp, (float)x, (float)y);
glBmp.Dispose();
}
else
{
//1. clear prev drawing result
_aggPainter.Clear(Drawing.Color.White);
_aggPainter.StrokeColor = Color.Black;
//2. print text span into Agg Canvas
_vxsTextPrinter.StartDrawOnLeftTop = false;
float dyOffset = _vxsTextPrinter.FontDescedingPx;
_vxsTextPrinter.DrawString(text, startAt, len, 0, -dyOffset);
//------------------------------------------------------
//debug save image from agg's buffer
#if DEBUG
//actualImage.dbugSaveToPngFile("d:\\WImageTest\\aa1.png");
#endif
//------------------------------------------------------
//3.copy to gl bitmap
//byte[] buffer = PixelFarm.Agg.ActualImage.GetBuffer(_actualImage);
//------------------------------------------------------
//debug save image from agg's buffer
//------------------------------------------------------
//GLBitmap glBmp = new GLBitmap(bmpWidth, bmpHeight, buffer, true);
GLBitmap glBmp = new GLBitmap(_actualImage);
glBmp.IsInvert = false;
//TODO: review font height
//if (StartDrawOnLeftTop)
//{
y += _vxsTextPrinter.FontLineSpacingPx;
//}
_glsx.DrawGlyphImage(glBmp, (float)x, (float)y + dyOffset);
glBmp.Dispose();
}
}
public void DrawString(char[] buffer, int startAt, int len, double x, double y)
{
_glsx.FontFillColor = painter.FontFillColor;
int j = buffer.Length;
//create temp buffer span that describe the part of a whole char buffer
TextBufferSpan textBufferSpan = new TextBufferSpan(buffer, startAt, len);
//ask text service to parse user input char buffer and create a glyph-plan-sequence (list of glyph-plan)
//with specific request font
GlyphPlanSequence glyphPlanSeq = _textServices.CreateGlyphPlanSeq(ref textBufferSpan, font);
float scale = _fontAtlas.TargetTextureScale;
int recommendLineSpacing = _fontAtlas.OriginalRecommendLineSpacing;
//--------------------------
//TODO:
//if (x,y) is left top
//we need to adjust y again
y -= ((_fontAtlas.OriginalRecommendLineSpacing) * scale);
EnsureLoadGLBmp();
//
float scaleFromTexture = _finalTextureScale;
TextureKind textureKind = _fontAtlas.TextureKind;
//--------------------------
//TODO: review render steps
//NOTE:
// -glyphData.TextureXOffset => restore to original pos
// -glyphData.TextureYOffset => restore to original pos
// ideal_x = (float)(x + (glyph.x * scale - glyphData.TextureXOffset) * scaleFromTexture);
// ideal_y = (float)(y + (glyph.y * scale - glyphData.TextureYOffset + srcRect.Height) * scaleFromTexture);
//--------------------------
float g_x = 0;
float g_y = 0;
int baseY = (int)Math.Round(y);
int n = glyphPlanSeq.len;
int endBefore = glyphPlanSeq.startAt + n;
for (int i = glyphPlanSeq.startAt; i < endBefore; ++i)
{
GlyphPlanList glyphPlanList = GlyphPlanSequence.UnsafeGetInteralGlyphPlanList(glyphPlanSeq);
GlyphPlan glyph = glyphPlanList[i];
Typography.Rendering.TextureFontGlyphData glyphData;
if (!_fontAtlas.TryGetGlyphDataByCodePoint(glyph.glyphIndex, out glyphData))
{
//if no glyph data, we should render a missing glyph ***
continue;
}
//--------------------------------------
//TODO: review precise height in float
//--------------------------------------
PixelFarm.Drawing.Rectangle srcRect = ConvToRect(glyphData.Rect);
g_x = (float)(x + (glyph.ExactX * scale - glyphData.TextureXOffset) * scaleFromTexture); //ideal x
g_y = (float)(y + (glyph.ExactY * scale - glyphData.TextureYOffset + srcRect.Height) * scaleFromTexture);
//for sharp glyph
//we adjust g_x,g_y to integer value
g_x = (float)Math.Round(g_x);
g_y = (float)Math.Floor(g_y);
switch (textureKind)
{
case TextureKind.Msdf:
_glsx.DrawSubImageWithMsdf(_glBmp,
ref srcRect,
g_x,
g_y,
scaleFromTexture);
break;
case TextureKind.StencilGreyScale:
//stencil gray scale with fill-color
_glsx.DrawGlyphImageWithStecil(_glBmp,
ref srcRect,
g_x,
g_y,
scaleFromTexture);
break;
case TextureKind.Bitmap:
_glsx.DrawSubImage(_glBmp,
ref srcRect,
g_x,
g_y,
scaleFromTexture);
break;
case TextureKind.StencilLcdEffect:
_glsx.DrawGlyphImageWithSubPixelRenderingTechnique(_glBmp,
ref srcRect,
g_x,
g_y,
scaleFromTexture);
break;
}
}
}
