skia.SKMaskFilter source code

1 module skia.SKMaskFilter;
2 
3 import skia.Definitions;
4 import skia.Exceptions;
5 import skia.MathTypes;
6 import skia.SKObject;
7 import skia.SkiaApi;
8 
9 enum SKBlurMaskFilterFlags {
10 	None = 0x00,
11 	IgnoreTransform = 0x01,
12 	HighQuality = 0x02,
13 	All = IgnoreTransform | HighQuality,
14 }
15 
16 // TODO: `getFormat`
17 // TODO: `computeFastBounds`
18 
19 class SKMaskFilter : SKObject {
20 	private enum float BlurSigmaScale = 0.57735f;
21 	enum int TableMaxLength = 256;
22 
23 	this(void* handle, bool owns) {
24 		super(handle, owns);
25 	}
26 
27 	protected override void Dispose(bool disposing) {
28 		return super.Dispose(disposing);
29 	}
30 
31 	static float ConvertRadiusToSigma(float radius) {
32 		return radius > 0 ? BlurSigmaScale * radius + 0.5f : 0.0f;
33 	}
34 
35 	static float ConvertSigmaToRadius(float sigma) {
36 		return sigma > 0.5f ? (sigma - 0.5f) / BlurSigmaScale : 0.0f;
37 	}
38 
39 	static SKMaskFilter CreateBlur(SKBlurStyle blurStyle, float sigma) {
40 		return GetObject(SkiaApi.sk_maskfilter_new_blur(blurStyle, sigma));
41 	}
42 
43 	static SKMaskFilter CreateBlur(SKBlurStyle blurStyle, float sigma, bool respectCTM) {
44 		return GetObject(SkiaApi.sk_maskfilter_new_blur_with_flags(blurStyle, sigma, respectCTM));
45 	}
46 
47 	static SKMaskFilter CreateBlur(SKBlurStyle blurStyle, float sigma, SKBlurMaskFilterFlags flags) {
48 		return CreateBlur(blurStyle, sigma, true);
49 	}
50 
51 	static SKMaskFilter CreateBlur(SKBlurStyle blurStyle, float sigma, SKRect occluder) {
52 		return CreateBlur(blurStyle, sigma, true);
53 	}
54 
55 	static SKMaskFilter CreateBlur(SKBlurStyle blurStyle, float sigma,
56 			SKRect occluder, SKBlurMaskFilterFlags flags) {
57 		return CreateBlur(blurStyle, sigma, true);
58 	}
59 
60 	static SKMaskFilter CreateBlur(SKBlurStyle blurStyle, float sigma,
61 			SKRect occluder, bool respectCTM) {
62 		return CreateBlur(blurStyle, sigma, respectCTM);
63 	}
64 
65 	static SKMaskFilter CreateTable(ubyte[] table) {
66 		if (table is null)
67 			throw new ArgumentNullException(table.stringof);
68 		if (table.length != TableMaxLength)
69 			throw new ArgumentException("Table must have a length of {SKColorTable.MaxLength}.",
70 					table.stringof);
71 		ubyte* t = table.ptr;
72 		return GetObject(SkiaApi.sk_maskfilter_new_table(t));
73 	}
74 
75 	static SKMaskFilter CreateGamma(float gamma) {
76 		return GetObject(SkiaApi.sk_maskfilter_new_gamma(gamma));
77 	}
78 
79 	static SKMaskFilter CreateClip(ubyte min, ubyte max) {
80 		return GetObject(SkiaApi.sk_maskfilter_new_clip(min, max));
81 	}
82 
83 	static SKMaskFilter GetObject(void* handle) {
84 		return GetOrAddObject!(SKMaskFilter)(handle, (h, o) { return new SKMaskFilter(h, o); });
85 	}
86 
87 }