private unsafe void DrawText(Cairo.ImageSurface dst, string textFont, string text, Point pt, Size measuredSize, bool antiAliasing, Cairo.ImageSurface brush8x8)
{
Point pt2 = pt;
Size measuredSize2 = measuredSize;
int offset = FontHeight;
pt.X -= offset;
measuredSize.Width += 2 * offset;
Rectangle dstRect = new Rectangle (pt, measuredSize);
Rectangle dstRectClipped = Rectangle.Intersect (dstRect, PintaCore.Layers.ToolLayer.Surface.GetBounds ());
PintaCore.Layers.ToolLayer.Clear ();
if (dstRectClipped.Width == 0 || dstRectClipped.Height == 0) {
return;
}
// We only use the first 8,8 of brush
using (Cairo.Context toolctx = new Cairo.Context (PintaCore.Layers.ToolLayer.Surface)) {
//toolctx.FillRectangle (new Cairo.Rectangle(0, 0, 800, 600), new Cairo.Color (0, 0, 0));
toolctx.FillRectangle (dstRect.ToCairoRectangle (), new Cairo.Color (1, 1, 1));
Cairo.ImageSurface surf = PintaCore.Layers.ToolLayer.Surface;
//TODO find how create a surface a of a particular area of a bigger surface!
//for moment work with the whole surface!
if (measuredSize.Width > 0 && measuredSize.Height > 0) {
//dstRectClipped
using (Cairo.Context ctx = new Cairo.Context (PintaCore.Layers.ToolLayer.Surface)) {
Cairo.TextExtents te = TextExtents (ctx, text);
//new Cairo.PointD(dstRect.X - dstRectClipped.X + offset, dstRect.Y - dstRectClipped.Y),
ctx.DrawText (new Cairo.PointD (dstRect.X + offset - te.XBearing, dstRect.Y - te.YBearing), textFont, FontSlant, FontWeight, FontSize, PintaCore.Palette.PrimaryColor, text);
if (underscore_btn.Active) {
int lineSize = 1;
Cairo.FontExtents fe = FontExtents (ctx, text);
ctx.DrawLine (new Cairo.PointD (pt2.X, dstRect.Bottom + fe.Descent), new Cairo.PointD (dstRect.Right - offset, dstRect.Bottom + fe.Descent), PintaCore.Palette.PrimaryColor, lineSize);
}
}
PintaCore.Workspace.Invalidate (dstRectClipped);
}
// Mask out anything that isn't within the user's clip region (selected region)
using (Region clip = Region.Rectangle (PintaCore.Layers.SelectionPath.GetBounds ())) {
clip.Xor (Region.Rectangle (dstRectClipped));
// invert
clip.Intersect (Region.Rectangle (new Rectangle (pt, measuredSize)));
toolctx.FillRegion (clip, new Cairo.Color (1, 1, 1, 1));
}
int skipX;
if (pt.X < 0) {
skipX = -pt.X;
} else {
skipX = 0;
}
int xEnd = Math.Min (dst.Width, pt.X + measuredSize.Width);
bool blending = false;
//AppEnvironment.AlphaBlending;
//if (dst.IsColumnVisible(pt.X + skipX))
//{
for (int y = pt.Y; y < pt.Y + measuredSize.Height; ++y) {
//if (!dst.IsRowVisible(y))
//{
// continue;
//}
ColorBgra* dstPtr = dst.GetPointAddressUnchecked (pt.X + skipX, y);
ColorBgra* srcPtr = PintaCore.Layers.ToolLayer.Surface.GetPointAddress (pt.X + skipX, y);
ColorBgra* brushPtr = brush8x8.GetRowAddressUnchecked (y & 7);
for (int x = pt.X + skipX; x < xEnd; ++x) {
ColorBgra srcPixel = *srcPtr;
ColorBgra dstPixel = *dstPtr;
ColorBgra brushPixel = brushPtr[x & 7];
int alpha = ((255 - srcPixel.R) * brushPixel.A) / 255;
// we could use srcPixel.R, .G, or .B -- the choice here is arbitrary
brushPixel.A = (byte)alpha;
// could use R, G, or B -- arbitrary choice
if (srcPtr->R == 255) {
// do nothing -- leave dst alone
} else if (alpha == 255 || !blending) {
// copy it straight over
*dstPtr = brushPixel;
} else {
// do expensive blending
*dstPtr = UserBlendOps.NormalBlendOp.ApplyStatic (dstPixel, brushPixel);
}
++dstPtr;
++srcPtr;
}
}
//}
}
}