public static void ColorTableColorFilter(SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
var assembly = typeof(Demos).GetTypeInfo().Assembly;
var imageName = assembly.GetName().Name + ".baboon.png";
var ct = new byte[256];
for (int i = 0; i < 256; ++i)
{
var x = (i - 96) * 255 / 64;
ct[i] = x < 0 ? (byte)0 : x > 255 ? (byte)255 : (byte)x;
}
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream(imageName))
using (var stream = new SKManagedStream(resource))
using (var bitmap = SKBitmap.Decode(stream))
using (var cf = SKColorFilter.CreateTable(null, ct, ct, ct))
using (var paint = new SKPaint())
{
paint.ColorFilter = cf;
canvas.DrawBitmap(bitmap, SKRect.Create(width, height), paint);
}
}
// WithColorFilter
public SKShader WithColorFilter (SKColorFilter filter)
{
if (filter == null)
throw new ArgumentNullException (nameof (filter));
return GetObject (SkiaApi.sk_shader_with_color_filter (Handle, filter.Handle));
}
public static SKImageFilter CreateColorFilter(SKColorFilter cf, SKImageFilter input = null, SKImageFilter.CropRect cropRect = null)
{
if (cf == null)
{
throw new ArgumentNullException(nameof(cf));
}
return(GetObject <SKImageFilter>(SkiaApi.sk_imagefilter_new_color_filter(cf.Handle, input == null ? IntPtr.Zero : input.Handle, cropRect == null ? IntPtr.Zero : cropRect.Handle)));
}
public static SKShader CreateColorFilter (SKShader shader, SKColorFilter filter)
{
if (shader == null)
throw new ArgumentNullException (nameof (shader));
if (filter == null)
throw new ArgumentNullException (nameof (filter));
return GetObject<SKShader> (SkiaApi.sk_shader_new_color_filter (shader.Handle, filter.Handle));
}
public static SKColorFilter CreateCompose(SKColorFilter outer, SKColorFilter inner)
{
if (outer == null)
throw new ArgumentNullException(nameof(outer));
if (inner == null)
throw new ArgumentNullException(nameof(inner));
return GetObject<SKColorFilter>(SkiaApi.sk_colorfilter_new_compose(outer.Handle, inner.Handle));
}
// CreateColorFilter
public static SKShader CreateColorFilter (SKShader shader, SKColorFilter filter)
{
if (shader == null)
throw new ArgumentNullException (nameof (shader));
if (filter == null)
throw new ArgumentNullException (nameof (filter));
return shader.WithColorFilter (filter);
}
private SKColorFilter ToColorFilter(SKData uniforms, SKShader[] children)
{
var uniformsHandle = uniforms?.Handle ?? IntPtr.Zero;
using var childrenHandles = Utils.RentHandlesArray(children, true);
fixed(IntPtr *ch = childrenHandles)
{
return(SKColorFilter.GetObject(SkiaApi.sk_runtimeeffect_make_color_filter(Handle, uniformsHandle, ch, (IntPtr)childrenHandles.Length)));
}
}
public static SKShader CreateColorFilter(SKShader shader, SKColorFilter filter)
{
if (shader == null)
{
throw new ArgumentNullException(nameof(shader));
}
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
return(GetObject <SKShader> (SkiaApi.sk_shader_new_color_filter(shader.Handle, filter.Handle)));
}
public static SKColorFilter CreateCompose(SKColorFilter outer, SKColorFilter inner)
{
if (outer == null)
{
throw new ArgumentNullException(nameof(outer));
}
if (inner == null)
{
throw new ArgumentNullException(nameof(inner));
}
return(GetObject <SKColorFilter>(SkiaApi.sk_colorfilter_new_compose(outer.Handle, inner.Handle)));
}
public static void XferModeColorFilter(SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
var assembly = typeof(Demos).GetTypeInfo().Assembly;
var imageName = assembly.GetName().Name + ".baboon.png";
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream(imageName))
using (var stream = new SKManagedStream(resource))
using (var bitmap = SKBitmap.Decode(stream))
using (var cf = SKColorFilter.CreateXferMode(SKColors.Red, SKXferMode.ColorDodge))
using (var paint = new SKPaint())
{
paint.ColorFilter = cf;
canvas.DrawBitmap(bitmap, SKRect.Create(width, height), paint);
}
}
public static void ColorMatrixColorFilter(SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
var assembly = typeof(Demos).GetTypeInfo().Assembly;
var imageName = assembly.GetName().Name + ".baboon.png";
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream(imageName))
using (var stream = new SKManagedStream(resource))
using (var bitmap = SKBitmap.Decode(stream))
{
var f = new Action <SKRect, float[]>((rect, colorMatrix) =>
{
using (var cf = SKColorFilter.CreateColorMatrix(colorMatrix))
using (var paint = new SKPaint())
{
paint.ColorFilter = cf;
canvas.DrawBitmap(bitmap, rect, paint);
}
});
var colorMatrix1 = new float[20] {
0f, 1f, 0f, 0f, 0f,
0f, 0f, 1f, 0f, 0f,
1f, 0f, 0f, 0f, 0f,
0f, 0f, 0f, 1f, 0f
};
var grayscale = new float[20] {
0.21f, 0.72f, 0.07f, 0.0f, 0.0f,
0.21f, 0.72f, 0.07f, 0.0f, 0.0f,
0.21f, 0.72f, 0.07f, 0.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
var colorMatrix3 = new float[20] {
-1f, 1f, 1f, 0f, 0f,
1f, -1f, 1f, 0f, 0f,
1f, 1f, -1f, 0f, 0f,
0f, 0f, 0f, 1f, 0f
};
var colorMatrix4 = new float[20] {
0.0f, 0.5f, 0.5f, 0f, 0f,
0.5f, 0.0f, 0.5f, 0f, 0f,
0.5f, 0.5f, 0.0f, 0f, 0f,
0.0f, 0.0f, 0.0f, 1f, 0f
};
var highContrast = new float[20] {
4.0f, 0.0f, 0.0f, 0.0f, -4.0f * 255f / (4.0f - 1f),
0.0f, 4.0f, 0.0f, 0.0f, -4.0f * 255f / (4.0f - 1f),
0.0f, 0.0f, 4.0f, 0.0f, -4.0f * 255f / (4.0f - 1f),
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
var colorMatrix6 = new float[20] {
0f, 0f, 1f, 0f, 0f,
1f, 0f, 0f, 0f, 0f,
0f, 1f, 0f, 0f, 0f,
0f, 0f, 0f, 1f, 0f
};
var sepia = new float[20] {
0.393f, 0.769f, 0.189f, 0.0f, 0.0f,
0.349f, 0.686f, 0.168f, 0.0f, 0.0f,
0.272f, 0.534f, 0.131f, 0.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
var inverter = new float[20] {
-1f, 0f, 0f, 0f, 255f,
0f, -1f, 0f, 0f, 255f,
0f, 0f, -1f, 0f, 255f,
0f, 0f, 0f, 1f, 0f
};
var matices = new[] {
colorMatrix1, grayscale, highContrast, sepia,
colorMatrix3, colorMatrix4, colorMatrix6, inverter
};
var cols = width < height ? 2 : 4;
var rows = (matices.Length - 1) / cols + 1;
var w = (float)width / cols;
var h = (float)height / rows;
for (int y = 0; y < rows; y++)
{
for (int x = 0; x < cols; x++)
{
f(SKRect.Create(x * w, y * h, w, h), matices[y * cols + x]);
}
}
}
}
public static SKShader CreateColorFilter(SKShader shader, SKColorFilter filter)
{
return(GetObject <SKShader> (SkiaApi.sk_shader_new_color_filter(shader.Handle, filter.Handle)));
}
public static SKImageFilter CreateColorFilter(SKColorFilter cf, SKImageFilter input = null, SKImageFilter.CropRect cropRect = null)
{
if (cf == null)
throw new ArgumentNullException(nameof(cf));
return GetObject<SKImageFilter>(SkiaApi.sk_imagefilter_new_color_filter(cf.Handle, input == null ? IntPtr.Zero : input.Handle, cropRect == null ? IntPtr.Zero : cropRect.Handle));
}
