public void Erase (SKColor color, SKRectI rect)
{
SkiaApi.sk_bitmap_erase_rect (Handle, color, ref rect);
}
public static void RenderRaster(SKCanvas canvas, SKBitmap bitmap, SKRect rect, float opacity = 1f)
{
// Better for quality. Helps to compare to WPF
var color = new SKColor(255, 255, 255, (byte)(255 * opacity));
var paint = new SKPaint { Color = color, FilterQuality = SKFilterQuality.High };
canvas.DrawBitmap(bitmap, rect, paint);
// Better for performance:
canvas.DrawBitmap(bitmap, rect);
}
public SkiaCanvasState(SkiaCanvasState prototype) : base(prototype)
{
_strokeColor = prototype._strokeColor;
_fillColor = prototype._fillColor;
_fontColor = prototype._fontColor;
_fontPaint = prototype.FontPaint.CreateCopy();
_fillPaint = prototype.FillPaint.CreateCopy();
_strokePaint = prototype.StrokePaint.CreateCopy();
_fontName = prototype._fontName;
_fontSize = prototype._fontSize;
Alpha = prototype.Alpha;
_scaleX = prototype._scaleX;
_scaleY = prototype._scaleY;
_typefaceInvalid = false;
_isBlurred = prototype._isBlurred;
_blurRadius = prototype._blurRadius;
_shadowed = prototype._shadowed;
//_shadowFilter = prototype._shadowFilter; // There is no reason the copy really needs to know about this.
_shadowColor = prototype._shadowColor;
_shadowX = prototype._shadowX;
_shadowY = prototype._shadowY;
_shadowBlur = prototype._shadowBlur;
}
public SKColorTable(SKColor[] colors, int count)
: this(SkiaApi.sk_colortable_new (colors, count), true)
{
if (Handle == IntPtr.Zero) {
throw new InvalidOperationException ("Unable to create a new SKColorTable instance.");
}
}
public static SKShader CreateLinearGradient (SKPoint start, SKPoint end, SKColor [] colors, float [] colorPos, SKShaderTileMode mode, SKMatrix localMatrix)
{
if (colors == null)
throw new ArgumentNullException (nameof (colors));
if (colorPos == null) {
return GetObject<SKShader> (SkiaApi.sk_shader_new_linear_gradient (new SKPoint [] { start, end }, colors, IntPtr.Zero, colors.Length, mode, ref localMatrix));
} else {
if (colors.Length != colorPos.Length)
throw new ArgumentException ("The number of colors must match the number of color positions.");
return GetObject<SKShader> (SkiaApi.sk_shader_new_linear_gradient (new SKPoint [] { start, end }, colors, colorPos, colors.Length, mode, ref localMatrix));
}
}
private void Draw(int[] data, int width, int height, int iterations, SKColor color)
{
var pixels = new SKColor[width * height];
for (int i = 0; i < width * height; i++)
{
if (data[i] == iterations)
{
pixels[i] = color;
}
else
{
pixels[i] = new SkiaSharp.SKColor((UInt32)(4000000000 / ((data[i] < 1) ? 1 : data[i])));
}
}
bitmap = new SKBitmap(width, height);
bitmap.Pixels = pixels;
}
public static bool TryParse(string hexString, out SKColor color)
{
if (string.IsNullOrWhiteSpace(hexString))
{
// error
color = SKColor.Empty;
return(false);
}
// clean up string
hexString = hexString.Trim().ToUpperInvariant();
if (hexString [0] == '#')
{
hexString = hexString.Substring(1);
}
var len = hexString.Length;
if (len == 3 || len == 4)
{
byte a, r, g, b;
// parse [A]
if (len == 4)
{
if (!byte.TryParse(string.Concat(hexString [len - 4], hexString [len - 4]), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out a))
{
// error
color = SKColor.Empty;
return(false);
}
}
else
{
a = 255;
}
// parse RGB
if (!byte.TryParse(string.Concat(hexString [len - 3], hexString [len - 3]), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out r) ||
!byte.TryParse(string.Concat(hexString [len - 2], hexString [len - 2]), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out g) ||
!byte.TryParse(string.Concat(hexString [len - 1], hexString [len - 1]), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out b))
{
// error
color = SKColor.Empty;
return(false);
}
// success
color = new SKColor(r, g, b, a);
return(true);
}
if (len == 6 || len == 8)
{
// parse [AA]RRGGBB
uint number;
if (!uint.TryParse(hexString, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out number))
{
// error
color = SKColor.Empty;
return(false);
}
// success
color = (SKColor)number;
// alpha was not provided, so use 255
if (len == 6)
{
color = color.WithAlpha(255);
}
return(true);
}
// error
color = SKColor.Empty;
return(false);
}
public static SKShader CreateTwoPointConicalGradient (SKPoint start, float startRadius, SKPoint end, float endRadius, SKColor [] colors, float [] colorPos, SKShaderTileMode mode, SKMatrix localMatrix)
{
if (colors == null)
throw new ArgumentNullException (nameof (colors));
if (colorPos == null) {
return GetObject<SKShader> (SkiaApi.sk_shader_new_two_point_conical_gradient (ref start, startRadius, ref end, endRadius, colors, IntPtr.Zero, colors.Length, mode, ref localMatrix));
} else {
if (colors.Length != colorPos.Length)
throw new ArgumentException ("The number of colors must match the number of color positions.");
return GetObject<SKShader> (SkiaApi.sk_shader_new_two_point_conical_gradient (ref start, startRadius, ref end, endRadius, colors, colorPos, colors.Length, mode, ref localMatrix));
}
}
public void Clear(SKColor color)
{
DrawColor(color, SKXferMode.Src);
}
public void DrawColor (SKColor color, SKXferMode mode)
{
DrawColor (color, (SKBlendMode)(int)mode);
}
public static SKColor SKColor(this Color color)
{
var skcol = new SkiaSharp.SKColor((uint)color.ToArgb());
return(skcol);
}
public void Erase(SKColor color)
{
SkiaApi.sk_bitmap_erase(Handle, color);
}
public void DrawColor(SKColor color, SKXferMode mode = SKXferMode.Src)
{
SkiaApi.sk_canvas_draw_color(Handle, color, mode);
}
public void DrawPoint(float x, float y, SKColor color)
{
SkiaApi.sk_canvas_draw_point_color (Handle, x, y, color);
}
public static SKImageFilter CreatePointLitSpecular(SKPoint3 location, SKColor lightColor, float surfaceScale, float ks, float shininess, SKImageFilter input = null, SKImageFilter.CropRect cropRect = null)
{
return GetObject<SKImageFilter>(SkiaApi.sk_imagefilter_new_point_lit_specular(ref location, lightColor, surfaceScale, ks, shininess, input == null ? IntPtr.Zero : input.Handle, cropRect == null ? IntPtr.Zero : cropRect.Handle));
}
public void Erase (SKColor color)
{
SkiaApi.sk_bitmap_erase (Handle, color);
}
// PreMultiply
public static SKPMColor PreMultiply(SKColor color) =>
SkiaApi.sk_color_premultiply((uint)color);
public static SKPMColor PreMultiply(SKColor color)
{
return(SkiaApi.sk_color_premultiply(color));
}
// CreateColor
public static SKShader CreateColor(SKColor color) =>
GetObject <SKShader> (SkiaApi.sk_shader_new_color((uint)color));
public bool Erase(SKColor color, SKRectI subset)
{
return(SkiaApi.sk_pixmap_erase_color(Handle, color, ref subset));
}
public bool Erase(SKColor color)
{
return(Erase(color, Rect));
}
public void Clear(SKColor color)
{
DrawColor(color, SKBlendMode.Src);
}
public void DrawPoint(SKPoint p, SKColor color)
{
DrawPoint(p.X, p.Y, color);
}
public static SKImageFilter CreateDistantLitDiffuse(SKPoint3 direction, SKColor lightColor, float surfaceScale, float kd, SKImageFilter input = null, SKImageFilter.CropRect cropRect = null)
{
return GetObject<SKImageFilter>(SkiaApi.sk_imagefilter_new_distant_lit_diffuse(ref direction, lightColor, surfaceScale, kd, input == null ? IntPtr.Zero : input.Handle, cropRect == null ? IntPtr.Zero : cropRect.Handle));
}
// DrawColor
public void DrawColor(SKColor color, SKBlendMode mode = SKBlendMode.Src)
{
SkiaApi.sk_canvas_draw_color(Handle, (uint)color, mode);
}
public void Clear(SKColor color)
{
DrawColor (color, SKXferMode.Src);
}
public static SKColorFilter CreateBlendMode(SKColor c, SKBlendMode mode)
{
return(GetObject <SKColorFilter>(SkiaApi.sk_colorfilter_new_mode((uint)c, mode)));
}
public PaintState(SKPaint paint, SKColor color, SKShader shader)
{
_paint = paint;
_color = color;
_shader = shader;
}
public static SKImageFilter CreateDistantLitSpecular(SKPoint3 direction, SKColor lightColor, float surfaceScale, float ks, float shininess, SKImageFilter input = null, SKImageFilter.CropRect cropRect = null)
{
return(GetObject <SKImageFilter>(SkiaApi.sk_imagefilter_new_distant_lit_specular(ref direction, lightColor, surfaceScale, ks, shininess, input == null ? IntPtr.Zero : input.Handle, cropRect == null ? IntPtr.Zero : cropRect.Handle)));
}
public extern static sk_shader_t sk_shader_new_color(SKColor color);
public static SKImageFilter CreateDropShadow(float dx, float dy, float sigmaX, float sigmaY, SKColor color, SKDropShadowImageFilterShadowMode shadowMode, SKImageFilter input = null, SKImageFilter.CropRect cropRect = null)
{
return(GetObject <SKImageFilter>(SkiaApi.sk_imagefilter_new_drop_shadow(dx, dy, sigmaX, sigmaY, color, shadowMode, input == null ? IntPtr.Zero : input.Handle, cropRect == null ? IntPtr.Zero : cropRect.Handle)));
}
public void Erase(SKColor color, SKRectI rect)
{
SkiaApi.sk_bitmap_erase_rect(Handle, color, ref rect);
}
public static SKImageFilter CreatePointLitDiffuse(SKPoint3 location, SKColor lightColor, float surfaceScale, float kd, SKImageFilter input = null, SKImageFilter.CropRect cropRect = null)
{
return(GetObject <SKImageFilter>(SkiaApi.sk_imagefilter_new_point_lit_diffuse(ref location, lightColor, surfaceScale, kd, input == null ? IntPtr.Zero : input.Handle, cropRect == null ? IntPtr.Zero : cropRect.Handle)));
}
public static void RenderTexture(SKCanvas canvas, SKBitmap bitmap, SKRect rect, float opacity = 1f)
{
var color = new SKColor(255, 255, 255, (byte) (255*opacity));
var paint = new SKPaint {Color = color, FilterQuality = SKFilterQuality.High};
canvas.DrawBitmap(bitmap, rect, paint);
}
public static SKImageFilter CreateSpotLitDiffuse(SKPoint3 location, SKPoint3 target, float specularExponent, float cutoffAngle, SKColor lightColor, float surfaceScale, float kd, SKImageFilter input = null, SKImageFilter.CropRect cropRect = null)
{
return(GetObject <SKImageFilter>(SkiaApi.sk_imagefilter_new_spot_lit_diffuse(ref location, ref target, specularExponent, cutoffAngle, lightColor, surfaceScale, kd, input == null ? IntPtr.Zero : input.Handle, cropRect == null ? IntPtr.Zero : cropRect.Handle)));
}
public void Clear (SKColor color)
{
DrawColor (color, SKBlendMode.Src);
}
private void ReadPaints(Dictionary <string, string> style, ref SKPaint strokePaint, ref SKPaint fillPaint)
{
// stroke
var stroke = GetString(style, "stroke").Trim();
if (stroke.Equals("none", StringComparison.OrdinalIgnoreCase))
{
strokePaint = null;
}
else
{
if (string.IsNullOrEmpty(stroke))
{
// no change
}
else
{
if (strokePaint == null)
{
strokePaint = CreatePaint(true);
}
SKColor color;
if (SKColor.TryParse(stroke, out color))
{
// preserve alpha
if (color.Alpha == 255)
{
strokePaint.Color = color.WithAlpha(strokePaint.Color.Alpha);
}
else
{
strokePaint.Color = color;
}
}
}
// stroke attributes
var strokeWidth = GetString(style, "stroke-width");
if (!string.IsNullOrWhiteSpace(strokeWidth))
{
if (strokePaint == null)
{
strokePaint = CreatePaint(true);
}
strokePaint.StrokeWidth = ReadNumber(strokeWidth);
}
var strokeOpacity = GetString(style, "stroke-opacity");
if (!string.IsNullOrWhiteSpace(strokeOpacity))
{
if (strokePaint == null)
{
strokePaint = CreatePaint(true);
}
strokePaint.Color = strokePaint.Color.WithAlpha((byte)(ReadNumber(strokeOpacity) * 255));
}
}
// fill
var fill = GetString(style, "fill").Trim();
if (fill.Equals("none", StringComparison.OrdinalIgnoreCase))
{
fillPaint = null;
}
else
{
if (string.IsNullOrEmpty(fill))
{
// no change
}
else
{
if (fillPaint == null)
{
fillPaint = CreatePaint();
}
SKColor color;
if (SKColor.TryParse(fill, out color))
{
// preserve alpha
if (color.Alpha == 255)
{
fillPaint.Color = color.WithAlpha(fillPaint.Color.Alpha);
}
else
{
fillPaint.Color = color;
}
}
else
{
var read = false;
var urlM = fillUrlRe.Match(fill);
if (urlM.Success)
{
var id = urlM.Groups[1].Value.Trim();
XElement defE;
if (defs.TryGetValue(id, out defE))
{
var gradientShader = ReadGradient(defE);
if (gradientShader != null)
{
// TODO: multiple shaders
fillPaint.Shader = gradientShader;
read = true;
}
// else try another type (eg: image)
}
else
{
LogOrThrow($"Invalid fill url reference: {id}");
}
}
if (!read)
{
LogOrThrow($"Unsupported fill: {fill}");
}
}
}
// fill attributes
var fillOpacity = GetString(style, "fill-opacity");
if (!string.IsNullOrWhiteSpace(fillOpacity))
{
if (fillPaint == null)
{
fillPaint = CreatePaint();
}
fillPaint.Color = fillPaint.Color.WithAlpha((byte)(ReadNumber(fillOpacity) * 255));
}
}
}
public static SKShader CreateSweepGradient (SKPoint center, SKColor [] colors, float [] colorPos, SKMatrix localMatrix)
{
if (colors == null)
throw new ArgumentNullException (nameof (colors));
if (colorPos == null) {
return GetObject<SKShader> (SkiaApi.sk_shader_new_sweep_gradient (ref center, colors, IntPtr.Zero, colors.Length, ref localMatrix));
} else {
if (colors.Length != colorPos.Length)
throw new ArgumentException ("The number of colors must match the number of color positions.");
return GetObject<SKShader> (SkiaApi.sk_shader_new_sweep_gradient (ref center, colors, colorPos, colors.Length, ref localMatrix));
}
}
public static SKShader CreateColor(SKColor color)
{
return(GetObject <SKShader> (SkiaApi.sk_shader_new_color(color)));
}
public static SKShader CreateColor (SKColor color)
{
return GetObject<SKShader> (SkiaApi.sk_shader_new_color (color));
}
public void Erase(SKColor color, SKRectI rect)
{
SkiaApi.sk_bitmap_erase_rect(Handle, (uint)color, &rect);
}
public static SKShader CreateRadialGradient (SKPoint center, float radius, SKColor [] colors, float [] colorPos, SKShaderTileMode mode)
{
if (colors == null)
throw new ArgumentNullException (nameof (colors));
if (colorPos == null) {
return GetObject<SKShader> (SkiaApi.sk_shader_new_radial_gradient (ref center, radius, colors, IntPtr.Zero, colors.Length, mode, IntPtr.Zero));
} else {
if (colors.Length != colorPos.Length)
throw new ArgumentException ("The number of colors must match the number of color positions.");
return GetObject<SKShader> (SkiaApi.sk_shader_new_radial_gradient (ref center, radius, colors, colorPos, colors.Length, mode, IntPtr.Zero));
}
}
public void SetPixel(int x, int y, SKColor color)
{
SkiaApi.sk_bitmap_set_pixel_color(Handle, x, y, (uint)color);
}
} // End Function LoadImage
private void DrawImage()
{
int bitness = System.IntPtr.Size * 8;
System.Console.WriteLine(bitness);
// https://developer.xamarin.com/guides/cross-platform/drawing/introduction/
// https://developer.xamarin.com/api/type/SkiaSharp.SKSurface/
// https://forums.xamarin.com/discussion/77883/skiasharp-graphics-basics
// Make sure the Microsoft Visual C++ 2015 Redistributable is installed if this error occurs:
// Unable to load DLL 'libSkiaSharp.dll': The specified module could not be found.
using (SKSurface surface = SKSurface.Create(width: 640, height: 480, colorType: SKColorType.Bgra8888, alphaType: SKAlphaType.Premul))
{
SKCanvas canvas = surface.Canvas;
canvas.Clear(SKColors.Transparent);
using (SKPaint paint = new SKPaint())
{
// paint.ImageFilter = SKImageFilter.CreateBlur(5, 5); // Dispose !
paint.IsAntialias = true;
// paint.Color = new SKColor(0xff, 0x00, 0xff);
paint.Color = new SKColor(0x2c, 0x3e, 0x50);
paint.StrokeCap = SKStrokeCap.Round;
paint.Typeface = SkiaSharp.SKTypeface.FromFamilyName("Impact", SKTypefaceStyle.Bold);
paint.TextSize = 12;
canvas.DrawText("foobar", 10, 10, paint);
// SkiaSharp.SKRect rect = new SkiaSharp.SKRect();
SkiaSharp.SKRect rect = MeasureText("foobar", "Impact", 12, SKTypefaceStyle.Bold);
// paint.MeasureText("foobar", ref rect);
System.Console.WriteLine(rect);
SKRect textOverlayRectangle = new SKRect();
textOverlayRectangle.Left = 9; // x
textOverlayRectangle.Top = 10 - rect.Height; // y
textOverlayRectangle.Right = textOverlayRectangle.Left + rect.Width;
textOverlayRectangle.Bottom = textOverlayRectangle.Top + rect.Height;
// canvas.DrawRect(textOverlayRectangle, paint);
// https://chromium.googlesource.com/external/skia/+/master/experimental/SkiaExamples/HelloSkiaExample.cpp
SkiaSharp.SKPoint[] linearPoints = new SkiaSharp.SKPoint[] {
new SkiaSharp.SKPoint(0, 0),
new SkiaSharp.SKPoint(300, 300)
};
SkiaSharp.SKColor[] linearColors = new SkiaSharp.SKColor[] { SkiaSharp.SKColors.Green, SkiaSharp.SKColors.Black };
// canvas.Restore();
// canvas.Translate(100, 200);
// canvas.RotateDegrees(45);
// SKShader shader = SkiaSharp.SKShader.CreateLinearGradient(linearPoints[0], linearPoints[1], linearColors, new float[] { 1.0f, 2000.0f }, SKShaderTileMode.Repeat);
// paint.Shader = shader;
SkiaSharp.SKBitmap shaderPattern = LoadImage(MapProjectPath(@"~mytile.png"));
SKShader hatchShader = SkiaSharp.SKShader.CreateBitmap(shaderPattern, SKShaderTileMode.Mirror, SKShaderTileMode.Repeat);
paint.Shader = hatchShader;
// create the Xamagon path
using (SKPath path = new SKPath())
{
path.MoveTo(71.4311121f, 56f);
path.CubicTo(68.6763107f, 56.0058575f, 65.9796704f, 57.5737917f, 64.5928855f, 59.965729f);
path.LineTo(43.0238921f, 97.5342563f);
path.CubicTo(41.6587026f, 99.9325978f, 41.6587026f, 103.067402f, 43.0238921f, 105.465744f);
path.LineTo(64.5928855f, 143.034271f);
path.CubicTo(65.9798162f, 145.426228f, 68.6763107f, 146.994582f, 71.4311121f, 147f);
path.LineTo(114.568946f, 147f);
path.CubicTo(117.323748f, 146.994143f, 120.020241f, 145.426228f, 121.407172f, 143.034271f);
path.LineTo(142.976161f, 105.465744f);
path.CubicTo(144.34135f, 103.067402f, 144.341209f, 99.9325978f, 142.976161f, 97.5342563f);
path.LineTo(121.407172f, 59.965729f);
path.CubicTo(120.020241f, 57.5737917f, 117.323748f, 56.0054182f, 114.568946f, 56f);
path.LineTo(71.4311121f, 56f);
path.Close();
// draw the Xamagon path
canvas.DrawPath(path, paint);
} // End Using path
// ClipDeviceBounds not ClipBounds
canvas.DrawLine(0, 0, canvas.ClipDeviceBounds.Width, canvas.ClipDeviceBounds.Height, paint);
canvas.DrawLine(0, canvas.ClipDeviceBounds.Height, canvas.ClipDeviceBounds.Width, 0, paint);
canvas.DrawLine(0 + 1, 0, 0 + 1, canvas.ClipDeviceBounds.Height, paint);
canvas.DrawLine(0, surface.Canvas.ClipDeviceBounds.Height / 2, canvas.ClipDeviceBounds.Width, canvas.ClipDeviceBounds.Height / 2, paint);
canvas.DrawLine(canvas.ClipDeviceBounds.Width - 1, 0 + 1, canvas.ClipDeviceBounds.Width - 1, canvas.ClipDeviceBounds.Height, paint);
} // End Using paint
// Your drawing code goes here.
// surface.Snapshot().Encode(SKImageEncodeFormat.Webp, 80);
// SKData p = surface.Snapshot().Encode();
SKData p = surface.Snapshot().Encode(SKImageEncodeFormat.Png, 80);
// p.SaveTo()
using (System.IO.MemoryStream ms = new System.IO.MemoryStream(p.ToArray()))
{
this.pictureBox1.Image = System.Drawing.Image.FromStream(ms);
} // End Using ms
System.IO.File.WriteAllBytes(MapProjectPath("~testme.png"), p.ToArray());
} // End Using surface
// this.Close();
} // End Sub
public static SKColorFilter CreateXferMode(SKColor c, SKXferMode mode)
{
return(GetObject <SKColorFilter>(SkiaApi.sk_colorfilter_new_mode(c, mode)));
}
public void SetPixel (int x, int y, SKColor color)
{
if (ColorType == SKColorType.Index8)
{
throw new NotSupportedException ("This method is not supported for bitmaps with ColorTypes of Index8.");
}
SkiaApi.sk_bitmap_set_pixel_color (Handle, x, y, color);
}
public static SKColorFilter CreateLighting(SKColor mul, SKColor add)
{
return(GetObject <SKColorFilter>(SkiaApi.sk_colorfilter_new_lighting(mul, add)));
}
public static SKImageFilter CreateDropShadow(float dx, float dy, float sigmaX, float sigmaY, SKColor color, SKDropShadowImageFilterShadowMode shadowMode, SKImageFilter input = null, SKImageFilter.CropRect cropRect = null)
{
return GetObject<SKImageFilter>(SkiaApi.sk_imagefilter_new_drop_shadow(dx, dy, sigmaX, sigmaY, color, shadowMode, input == null ? IntPtr.Zero : input.Handle, cropRect == null ? IntPtr.Zero : cropRect.Handle));
}
public extern static sk_imagefilter_t sk_imagefilter_new_point_lit_diffuse(ref SKPoint3 location, SKColor lightColor, float surfaceScale, float kd, sk_imagefilter_t input /*NULL*/, sk_imagefilter_croprect_t cropRect /*NULL*/);
public static SKImageFilter CreateSpotLitDiffuse(SKPoint3 location, SKPoint3 target, float specularExponent, float cutoffAngle, SKColor lightColor, float surfaceScale, float kd, SKImageFilter input = null, SKImageFilter.CropRect cropRect = null)
{
return GetObject<SKImageFilter>(SkiaApi.sk_imagefilter_new_spot_lit_diffuse(ref location, ref target, specularExponent, cutoffAngle, lightColor, surfaceScale, kd, input == null ? IntPtr.Zero : input.Handle, cropRect == null ? IntPtr.Zero : cropRect.Handle));
}
public extern static sk_imagefilter_t sk_imagefilter_new_point_lit_specular(ref SKPoint3 location, SKColor lightColor, float surfaceScale, float ks, float shininess, sk_imagefilter_t input /*NULL*/, sk_imagefilter_croprect_t cropRect /*NULL*/);
public SKColorTable(SKColor[] colors)
: this(colors, colors.Length)
{
}
public extern static sk_imagefilter_t sk_imagefilter_new_spot_lit_specular(ref SKPoint3 location, ref SKPoint3 target, float specularExponent, float cutoffAngle, SKColor lightColor, float surfaceScale, float ks, float shininess, sk_imagefilter_t input /*NULL*/, sk_imagefilter_croprect_t cropRect /*NULL*/);
public void DrawColor(SKColor color, SKXferMode mode = SKXferMode.Src)
{
SkiaApi.sk_canvas_draw_color (Handle, color, mode);
}
public extern static sk_colorfilter_t sk_colorfilter_new_mode(SKColor c, SKXferMode mode);
internal PaintWrapper CreatePaint(IBrush brush, Size targetSize)
{
SKPaint paint = new SKPaint();
var rv = new PaintWrapper(paint);
paint.IsStroke = false;
// TODO: SkiaSharp does not contain alpha yet!
double opacity = brush.Opacity * _currentOpacity;
//paint.SetAlpha(paint.GetAlpha() * opacity);
paint.IsAntialias = true;
SKColor color = new SKColor(255, 255, 255, 255);
var solid = brush as ISolidColorBrush;
if (solid != null)
color = solid.Color.ToSKColor();
paint.Color = (new SKColor(color.Red, color.Green, color.Blue, (byte)(color.Alpha * opacity)));
if (solid != null)
{
return rv;
}
var gradient = brush as GradientBrush;
if (gradient != null)
{
var tileMode = gradient.SpreadMethod.ToSKShaderTileMode();
var stopColors = gradient.GradientStops.Select(s => s.Color.ToSKColor()).ToArray();
var stopOffsets = gradient.GradientStops.Select(s => (float)s.Offset).ToArray();
var linearGradient = brush as LinearGradientBrush;
if (linearGradient != null)
{
var start = linearGradient.StartPoint.ToPixels(targetSize).ToSKPoint();
var end = linearGradient.EndPoint.ToPixels(targetSize).ToSKPoint();
// would be nice to cache these shaders possibly?
var shader = SKShader.CreateLinearGradient(start, end, stopColors, stopOffsets, tileMode);
paint.Shader = shader;
shader.Dispose();
}
else
{
var radialGradient = brush as RadialGradientBrush;
if (radialGradient != null)
{
var center = radialGradient.Center.ToPixels(targetSize).ToSKPoint();
var radius = (float)radialGradient.Radius;
// TODO: There is no SetAlpha in SkiaSharp
//paint.setAlpha(128);
// would be nice to cache these shaders possibly?
var shader = SKShader.CreateRadialGradient(center, radius, stopColors, stopOffsets, tileMode);
paint.Shader = shader;
shader.Dispose();
}
}
return rv;
}
var tileBrush = brush as TileBrush;
if (tileBrush != null)
{
var helper = new TileBrushImplHelper(tileBrush, targetSize);
var bitmap = new BitmapImpl((int)helper.IntermediateSize.Width, (int)helper.IntermediateSize.Height);
rv.AddDisposable(bitmap);
using (var ctx = bitmap.CreateDrawingContext())
helper.DrawIntermediate(ctx);
SKMatrix translation = SKMatrix.MakeTranslation(-(float)helper.DestinationRect.X, -(float)helper.DestinationRect.Y);
SKShaderTileMode tileX =
tileBrush.TileMode == TileMode.None
? SKShaderTileMode.Clamp
: tileBrush.TileMode == TileMode.FlipX || tileBrush.TileMode == TileMode.FlipXY
? SKShaderTileMode.Mirror
: SKShaderTileMode.Repeat;
SKShaderTileMode tileY =
tileBrush.TileMode == TileMode.None
? SKShaderTileMode.Clamp
: tileBrush.TileMode == TileMode.FlipY || tileBrush.TileMode == TileMode.FlipXY
? SKShaderTileMode.Mirror
: SKShaderTileMode.Repeat;
paint.Shader = SKShader.CreateBitmap(bitmap.Bitmap, tileX, tileY, translation);
paint.Shader.Dispose();
}
return rv;
}
public extern static sk_colorfilter_t sk_colorfilter_new_lighting(SKColor mul, SKColor add);
public static bool TryParse(string hexString, out SKColor color)
{
if (hexString == null)
{
// error
color = SKColor.Empty;
return false;
}
// clean up string
hexString = hexString.Trim().ToUpperInvariant();
if (hexString == "")
{
color = SKColor.Empty;
return false;
}
if (hexString[0] == '#')
hexString = hexString.Substring(1);
var len = hexString.Length;
if (len == 3 || len == 4)
{
byte a, r, g, b;
// parse [A]
if (len == 4)
{
if (!byte.TryParse(string.Concat(hexString[len - 4], hexString[len - 4]), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out a))
{
// error
color = SKColor.Empty;
return false;
}
}
else
{
a = 255;
}
// parse RGB
if (!byte.TryParse(string.Concat(hexString[len - 3], hexString[len - 3]), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out r) ||
!byte.TryParse(string.Concat(hexString[len - 2], hexString[len - 2]), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out g) ||
!byte.TryParse(string.Concat(hexString[len - 1], hexString[len - 1]), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out b))
{
// error
color = SKColor.Empty;
return false;
}
// success
color = new SKColor(r, g, b, a);
return true;
}
if (len == 6 || len == 8)
{
// parse [AA]RRGGBB
uint number;
if (!uint.TryParse(hexString, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out number))
{
// error
color = SKColor.Empty;
return false;
}
// success
color = (SKColor)number;
// alpha was not provided, so use 255
if (len == 6)
{
color = color.WithAlpha(255);
}
return true;
}
// error
color = SKColor.Empty;
return false;
}
public void DrawPoint(float x, float y, SKColor color)
{
SkiaApi.sk_canvas_draw_point_color(Handle, x, y, color);
}