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// Copyright (c) 2018-2020 Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
//
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
using System;
using System.Text;
using System.Linq;
using Drawing2D;
namespace Crow.VkvgBackend
{
public class Context : IContext
{
internal IntPtr handle = IntPtr.Zero;
internal Context (Surface surf)
{
handle = NativeMethods.vkvg_create(surf.handle);
this.FillRule = FillRule.NonZero;
}
~Context()
{
Dispose(false);
}
public double LineWidth
{
get => NativeMethods.vkvg_get_line_width(handle);
set { NativeMethods.vkvg_set_line_width(handle, (float)value); }
}
public LineJoin LineJoin
{
get => NativeMethods.vkvg_get_line_join(handle);
set { NativeMethods.vkvg_set_line_join(handle, value); }
}
public LineCap LineCap
{
get => NativeMethods.vkvg_get_line_cap(handle);
set { NativeMethods.vkvg_set_line_cap(handle, value); }
}
public Operator Operator
{
set { NativeMethods.vkvg_set_operator(handle, value); }
get { return NativeMethods.vkvg_get_operator(handle); }
}
public FillRule FillRule
{
set { NativeMethods.vkvg_set_fill_rule(handle, value); }
get { return NativeMethods.vkvg_get_fill_rule(handle); }
}
public Drawing2D.FontExtents FontExtents
{
get
{
FontExtents e;
NativeMethods.vkvg_font_extents(handle, out e);
return new Drawing2D.FontExtents (e.Ascent, e.Descent, e.Height, e.MaxXAdvance, e.MaxYAdvance);
}
}
public Antialias Antialias {
set;
get;
}
public void Clear() => NativeMethods.vkvg_clear(handle);
public void Clip() => NativeMethods.vkvg_clip(handle);
public void ClipPreserve() => NativeMethods.vkvg_clip_preserve(handle);
public void ResetClip() => NativeMethods.vkvg_reset_clip(handle);
public void Save() => NativeMethods.vkvg_save(handle);
public void Restore() => NativeMethods.vkvg_restore(handle);
public void Flush() => NativeMethods.vkvg_flush(handle);
public void Paint() => NativeMethods.vkvg_paint(handle);
public void PaintWithAlpha (double alpha) => Paint();
public void SetFontSize (double size) => NativeMethods.vkvg_set_font_size(handle, (uint)size);
public void ClosePath() => NativeMethods.vkvg_close_path (handle);
public void NewPath() => NativeMethods.vkvg_new_path(handle);
public void NewSubPath() => NativeMethods.vkvg_new_sub_path(handle);
public void Arc(double xc, double yc, double radius, double a1, double a2)
=> NativeMethods.vkvg_arc(handle, (float)xc, (float)yc, (float)radius, (float)a1, (float)a2);
public void Arc (PointD center, double radius, double angle1, double angle2)
=> NativeMethods.vkvg_arc (handle, (float)center.X, (float)center.Y, (float)radius, (float)angle1, (float)angle2);
public void ArcNegative (PointD center, double radius, double angle1, double angle2)
=> NativeMethods.vkvg_arc_negative (handle, (float)center.X, (float)center.Y, (float)radius, (float)angle1, (float)angle2);
public void ArcNegative(double xc, double yc, double radius, double a1, double a2)
=> NativeMethods.vkvg_arc_negative(handle, (float)xc, (float)yc, (float)radius, (float)a1, (float)a2);
/*public IntPtr Handle => handle;
public void AddReference()
{
NativeMethods.vkvg_reference(handle);
}
public uint References() => NativeMethods.vkvg_get_reference_count(handle);
public string FontFace
{
set { NativeMethods.vkvg_select_font_face(handle, value); }
}
public Matrix Matrix
{
get
{
Matrix m;
NativeMethods.vkvg_get_matrix(handle, out m);
return m;
}
set
{
NativeMethods.vkvg_set_matrix(handle, ref value);
}
}
}
public Rectangle StrokeExtents () => default;
public float[] Dashes
{
set
{
if (value == null)
NativeMethods.vkvg_set_dash(handle, null, 0, 0);
else
NativeMethods.vkvg_set_dash(handle, value, (uint)value.Length, 0);
}
}
public void PushGroup () {
}
public void PopGroupToSource () {
}
public void SelectFontFace(string family, FontSlant slant, FontWeight weight)
{
throw new NotImplementedException();
}
*/
//public void MoveTo(float x, float y) => NativeMethods.vkvg_move_to(handle, x, y);
public void MoveTo(double x, double y) => NativeMethods.vkvg_move_to(handle, (float)x, (float)y);
public void MoveTo(Point p) => NativeMethods.vkvg_move_to(handle, p.X, p.Y);
public void MoveTo(PointD p) => NativeMethods.vkvg_move_to(handle, (float)p.X, (float)p.Y);
//public void RelMoveTo(float x, float y) => NativeMethods.vkvg_rel_move_to(handle, x, y);
//public void LineTo(float x, float y) => NativeMethods.vkvg_line_to(handle, x, y);
public void LineTo(Point p) => NativeMethods.vkvg_line_to(handle, p.X, p.Y);
public void LineTo(PointD p) => NativeMethods.vkvg_line_to(handle, (float)p.X, (float)p.Y);
public void LineTo(double x, double y) => NativeMethods.vkvg_line_to(handle, (float)x, (float)y);
//public void RelLineTo(float x, float y) => NativeMethods.vkvg_rel_line_to(handle, x, y);
/*public void CurveTo(float x1, float y1, float x2, float y2, float x3, float y3)
=> NativeMethods.vkvg_curve_to(handle, x1, y1, x2, y2, x3, y3);*/
public void CurveTo(double x1, double y1, double x2, double y2, double x3, double y3)
=> NativeMethods.vkvg_curve_to (handle, (float)x1, (float)y1, (float)x2, (float)y2, (float)x3, (float)y3);
public void RelMoveTo(double x, double y) => NativeMethods.vkvg_rel_move_to(handle, (float)x, (float)y);
public void RelLineTo(double x, double y) => NativeMethods.vkvg_rel_line_to(handle, (float)x, (float)y);
public void RelCurveTo(double x1, double y1, double x2, double y2, double x3, double y3)
=> NativeMethods.vkvg_rel_curve_to(handle, (float)x1, (float)y1, (float)x2, (float)y2, (float)x3, (float)y3);
//public void RelCurveTo(float x1, float y1, float x2, float y2, float x3, float y3)
// => NativeMethods.vkvg_rel_curve_to(handle, x1, y1, x2, y2, x3, y3);
public void Rectangle(double x, double y, double width, double height)
=> NativeMethods.vkvg_rectangle (handle, (float)x, (float)y, (float)width, (float)height);
public void Rectangle(Rectangle r)
=> NativeMethods.vkvg_rectangle (handle, (float)r.X, (float)r.Y, (float)r.Width, (float)r.Height);
public void SetSource(IPattern pat) {
if (pat is Pattern p)
NativeMethods.vkvg_set_source (handle, p.handle);
}
public void SetSource (Color color)
{
NativeMethods.vkvg_set_source_rgba (handle,
(float)(color.R / 255.0), (float)(color.G / 255.0), (float)(color.B / 255.0), (float)(color.A / 255.0));
}
public void SetSource(ISurface surf, double x = 0, double y = 0)
=> NativeMethods.vkvg_set_source_surface(handle, (surf as Surface).handle, (float)x, (float)y);
public void SetSource(double r, double g, double b, double a = 1.0)
=> NativeMethods.vkvg_set_source_rgba(handle, (float)r, (float)g, (float)b, (float)a);
public void RenderSvg(ISvgHandle nsvgImage, string subId = null)
=> nsvgImage.Render (this, subId);
Matrix savedMat = Matrix.Identity;
public void SaveTransformations() => NativeMethods.vkvg_get_matrix (handle, out savedMat);
public void RestoreTransformations() => NativeMethods.vkvg_set_matrix (handle, ref savedMat);
public void Scale(double sx, double sy) => NativeMethods.vkvg_scale(handle, (float)sx, (float)sy);
public void Translate(double dx, double dy) => NativeMethods.vkvg_translate(handle, (float)dx, (float)dy);
public void Translate(PointD p) => NativeMethods.vkvg_translate(handle, (float)p.X, (float)p.Y);
public void Rotate(double alpha) => NativeMethods.vkvg_rotate(handle, (float)alpha);
public void Fill() => NativeMethods.vkvg_fill(handle);
public void FillPreserve() => NativeMethods.vkvg_fill_preserve(handle);
public void Stroke() => NativeMethods.vkvg_stroke(handle);
public void StrokePreserve() => NativeMethods.vkvg_stroke_preserve(handle);
public Rectangle StrokeExtents()
{
throw new NotImplementedException();
}
public void PopGroupToSource()
{
throw new NotImplementedException();
}
public void PushGroup()
{
throw new NotImplementedException();
}
public void SelectFontFace(string family, FontSlant slant, FontWeight weight)
{
NativeMethods.vkvg_select_font_face (handle, family);
}
internal static byte[] TerminateUtf8(string s)
{
// compute the byte count including the trailing \0
var byteCount = Encoding.UTF8.GetMaxByteCount(s.Length + 1);
var bytes = new byte[byteCount];
Encoding.UTF8.GetBytes(s, 0, s.Length, bytes, 0);
return bytes;
}
public void SetDash (double [] dashes, double offset = 0) {
if (dashes == null)
NativeMethods.vkvg_set_dash(handle, null, 0, 0);
else {
float[] floats = dashes.Cast<float> ().ToArray ();
NativeMethods.vkvg_set_dash(handle, floats, (uint)dashes.Length, (float)offset);
}
}
public Drawing2D.TextExtents TextExtents (ReadOnlySpan<char> s, int tabSize = 4) {
TextExtents (s, tabSize, out Drawing2D.TextExtents e);
return e;
}
public void TextExtents (ReadOnlySpan<char> s, int tabSize, out Drawing2D.TextExtents extents) {
if (s.Length == 0) {
extents = default;
return;
}
int size = s.Length * 4 + 1;
Span<byte> bytes = size > 512 ? new byte[size] : stackalloc byte[size];
int encodedBytes = s.ToUtf8 (bytes, tabSize);
bytes[encodedBytes] = 0;
TextExtents (bytes.Slice (0, encodedBytes + 1), out extents);
}
public void TextExtents (Span<byte> bytes, out Drawing2D.TextExtents extents) {
NativeMethods.vkvg_text_extents (handle, ref bytes.GetPinnableReference (), out TextExtents e);
extents = new Drawing2D.TextExtents (e.XBearing, e.YBearing, e.Width, e.Height, e.XAdvance, e.YAdvance);
}
public void ShowText (string text) => ShowText (text.AsSpan());
public void ShowText (ReadOnlySpan<char> s, int tabSize = 4) {
int size = s.Length * 4 + 1;
Span<byte> bytes = size > 512 ? new byte[size] : stackalloc byte[size];
int encodedBytes = s.ToUtf8 (bytes, tabSize);
bytes[encodedBytes] = 0;
ShowText (bytes.Slice (0, encodedBytes + 1));
}
public void ShowText (Span<byte> bytes) {
NativeMethods.vkvg_show_text (handle, ref bytes.GetPinnableReference());
}
public void ShowText(TextRun textRun)
=> NativeMethods.vkvg_show_text_run(handle, textRun.Handle);
#region IDisposable implementation
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!disposing || handle == IntPtr.Zero)
return;
NativeMethods.vkvg_destroy(handle);
handle = IntPtr.Zero;
}
#endregion
}
}
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