public void DrawImage(INativeImage image, int x, int y)
{
x -= origin.X;
y -= origin.Y;
// todo: allow null?
X11Image x11Image = (X11Image)image;
XRenderPictureAttributes attr = new XRenderPictureAttributes();
var tempPictureId = LibXRender.XRenderCreatePicture(display, x11Image.PixmapId, pictFormatPtr, 0, ref attr);
try
{
LibXRender.XRenderComposite
(
display,
PictOp.PictOpOver,
tempPictureId,
0,
pictureId,
0, 0,
0, 0,
x, y,
(uint)x11Image.Width, (uint)x11Image.Height
);
}
finally
{
LibXRender.XRenderFreePicture(display, tempPictureId);
}
}
public static X11Graphics Create(IntPtr display)
{
int defaultScreen = LibX11.XDefaultScreen(display);
ulong defaultRootWindow = LibX11.XDefaultRootWindow(display);
//todo: is is safe to keep pictFormatPtr after reading it into XRenderPictFormat
IntPtr pictFormatPtr = LibXRender.XRenderFindStandardFormat(display, StandardPictFormat.PictStandardARGB32);
if (pictFormatPtr == IntPtr.Zero)
{
throw new InvalidOperationException("Display does not support 32-bit ARGB.");
}
XRenderPictFormat pictFormat = Marshal.PtrToStructure <XRenderPictFormat>(pictFormatPtr);
int status = LibX11.XMatchVisualInfo
(
display,
defaultScreen,
pictFormat.depth,
VisualClass.TrueColor,
out XVisualInfo visualInfo
);
if (status == 0)
{
throw new InvalidOperationException($"TrueColor visual with depth {pictFormat.depth} does not exist.");
}
ulong colorMap = LibX11.XCreateColormap(display, defaultRootWindow, visualInfo.visual, CreateColormapOption.AllocNone);
return(new X11Graphics(display, defaultScreen, defaultRootWindow, visualInfo.visual, colorMap, pictFormat, pictFormatPtr));
}
public void DrawString(Color color, FontConfig font, int x, int y, string text)
{
x -= origin.X;
y -= origin.Y;
var xftColorPtr = Marshal.AllocHGlobal(Marshal.SizeOf <XftColor>());
try
{
XRenderColor xColor = new XRenderColor(color);
LibXft.XftColorAllocValue(
display,
visual,
colormap,
ref xColor,
xftColorPtr
);
try
{
XftFontExt fontExt = objectCache.GetXftFont(font);
var fontInfo = Marshal.PtrToStructure <XftFont>(fontExt.MainFont);
int xOffset = DrawString(xftDraw, xftColorPtr, fontExt, x, y + fontInfo.ascent, text);
if (font.IsUnderline)
{
int lineHeight = Convert.ToInt32(Math.Max(font.Size / 10, 1));
LibXRender.XRenderFillRectangle(
display, PictOp.PictOpOver, pictureId, ref xColor,
x,
y + fontInfo.ascent + (fontInfo.descent - lineHeight) / 2,
(uint)xOffset,
(uint)lineHeight
);
}
if (font.IsStrikeout)
{
int lineHeight = Convert.ToInt32(Math.Max(font.Size / 20, 1));
LibXRender.XRenderFillRectangle
(
display, PictOp.PictOpOver, pictureId, ref xColor,
x,
y + fontInfo.ascent - (2 * fontInfo.ascent + 3 * lineHeight) / 6,
(uint)xOffset,
(uint)lineHeight
);
}
}
finally
{
LibXft.XftColorFree(display, visual, colormap, xftColorPtr);
}
}
finally
{
Marshal.FreeHGlobal(xftColorPtr);
}
}
public void SetClipRectangle(int x, int y, int width, int height)
{
x -= origin.X;
y -= origin.Y;
clipRectangles = new[] { new XRectangle(x, y, width, height) };
LibXRender.XRenderSetPictureClipRectangles(display, pictureId, 0, 0, clipRectangles, 1);
LibXft.XftDrawSetClipRectangles(xftDraw, 0, 0, clipRectangles, 1);
}
private void DrawPathWithXRenderCompositeTriStrip(Color color, int width, Point[] points)
{
if (width == 0)
{
width = 1;
}
XRenderColor xColor = new XRenderColor(color);
// todo: cache brush
ulong brush = LibXRender.XRenderCreateSolidFill(display, ref xColor);
try
{
XPointFixed[] stripPoints = new XPointFixed[(points.Length - 1) * 3 + 1];
for (int i = 1, t = 0, m = 1; i < points.Length; i++, m = -m)
{
Point p1 = points[i - 1];
Point p2 = points[i];
p1.Offset(-origin.X, -origin.Y);
p2.Offset(-origin.X, -origin.Y);
int dx = p2.X - p1.X;
int dy = p2.Y - p1.Y;
double len = Math.Sqrt(Math.Pow(dx, 2) + Math.Pow(dy, 2));
// todo: handle 0 points and zero-length segments
int ox = Convert.ToInt32(-dy / len * 32768 * width) * m;
int oy = Convert.ToInt32(dx / len * 32768 * width) * m;
if (i == 1)
{
// todo: handle separately without if
stripPoints[t++] = new XPointFixed {
x = (p1.X << 16) + ox, y = (p1.Y << 16) + oy
};
}
stripPoints[t++] = new XPointFixed {
x = (p1.X << 16) - ox, y = (p1.Y << 16) - oy
};
stripPoints[t++] = new XPointFixed {
x = (p2.X << 16) + ox, y = (p2.Y << 16) + oy
};
stripPoints[t++] = new XPointFixed {
x = (p2.X << 16) - ox, y = (p2.Y << 16) - oy
};
}
LibXRender.XRenderCompositeTriStrip(display, PictOp.PictOpOver, brush, pictureId, pictFormatPtr, 0, 0, stripPoints, stripPoints.Length);
}
finally
{
LibXRender.XRenderFreePicture(display, brush);
}
}
private void DrawPathWithXRenderCompositeDoublePoly(Color color, int width, Point[] points)
{
if (width == 0)
{
width = 1;
}
XRenderColor xColor = new XRenderColor(color);
// todo: cache brush
ulong brush = LibXRender.XRenderCreateSolidFill(display, ref xColor);
try
{
XPointDouble[] polyPoints = new XPointDouble[points.Length * 2];
for (int i = 1, t = polyPoints.Length - 2; i < points.Length; i++, t--)
{
Point p1 = points[i - 1];
Point p2 = points[i];
p1.Offset(-origin.X, -origin.Y);
p2.Offset(-origin.X, -origin.Y);
int dx = p2.X - p1.X;
int dy = p2.Y - p1.Y;
double len = Math.Sqrt(Math.Pow(dx, 2) + Math.Pow(dy, 2));
double ox = -dy / len * width / 2;
double oy = dx / len * width / 2;
polyPoints[i] = new XPointDouble {
x = points[i].X + ox, y = points[i].Y + oy
};
polyPoints[t] = new XPointDouble {
x = points[i].X - ox, y = points[i].Y - oy
};
if (i == 1)
{
// todo: handle separately without if
polyPoints[0] = new XPointDouble {
x = points[0].X + ox, y = points[0].Y + oy
};
polyPoints[polyPoints.Length - 1] = new XPointDouble {
x = points[0].X - ox, y = points[0].Y - oy
};
}
}
LibXRender.XRenderCompositeDoublePoly(display, PictOp.PictOpOver, brush, pictureId, pictFormatPtr, 0, 0, 0, 0, polyPoints, polyPoints.Length, 1);
}
finally
{
LibXRender.XRenderFreePicture(display, brush);
}
}
public static X11Canvas CreateForDrawable(
IntPtr display,
int screenNum,
X11ObjectCache objectCache,
IntPtr visual,
ulong colormap,
IntPtr pictFormatPtr,
ulong drawableId
)
{
const XRenderPictureAttributeMask attrMask =
XRenderPictureAttributeMask.CPPolyEdge |
XRenderPictureAttributeMask.CPPolyMode;
XRenderPictureAttributes attr = new XRenderPictureAttributes
{
poly_edge = XRenderPolyEdge.Smooth,
poly_mode = XRenderPolyMode.Imprecise
};
ulong pictureId = LibXRender.XRenderCreatePicture
(
display,
drawableId,
pictFormatPtr,
attrMask,
ref attr
);
IntPtr xftDraw = IntPtr.Zero;
X11Canvas canvas = null;
try
{
xftDraw = LibXft.XftDrawCreate(display, drawableId, visual, colormap);
canvas = new X11Canvas(display, screenNum, objectCache, visual, colormap, pictFormatPtr, drawableId, pictureId, xftDraw);
xftDraw = IntPtr.Zero;
}
finally
{
if (canvas == null)
{
if (xftDraw != IntPtr.Zero)
{
LibXft.XftDrawDestroy(xftDraw);
}
LibXRender.XRenderFreePicture(display, pictureId);
}
}
return(canvas);
}
public void FillRectangle(Color color, int x, int y, int width, int height)
{
// todo: <= 0 instead?
if (width < 0 || height < 0)
{
return;
}
x -= origin.X;
y -= origin.Y;
XRenderColor xColor = new XRenderColor(color);
LibXRender.XRenderFillRectangle(display, PictOp.PictOpOver, pictureId, ref xColor, x, y, (uint)width, (uint)height);
}
public void Dispose()
{
LibXft.XftDrawDestroy(xftDraw);
LibXRender.XRenderFreePicture(display, pictureId);
}