///////////////////////////////////////////////////////////////////////////////// // Paint.NET // // Copyright (C) Rick Brewster, Tom Jackson, and past contributors. // // Portions Copyright (C) Microsoft Corporation. All Rights Reserved. // // See src/Resources/Files/License.txt for full licensing and attribution // // details. // // . // ///////////////////////////////////////////////////////////////////////////////// using System; using System.Drawing; using System.Windows.Forms; namespace PaintDotNet.Effects { public sealed class CloudsEffect : Effect { private int scale; private byte seed; private double power; // This is so that repetition of the effect with CTRL+F actually shows up differently. private byte instanceSeed = unchecked((byte)DateTime.Now.Ticks); public static string StaticName { get { return PdnResources.GetString("CloudsEffect.Name"); } } public static Image StaticImage { get { return PdnResources.GetImage("Icons.CloudsEffect.png"); } } public CloudsEffect() : base(StaticName, StaticImage, true) { } public override EffectConfigDialog CreateConfigDialog() { EffectConfigDialog dlg = new CloudsEffectConfigDialog(); return dlg; } public override void Render(EffectConfigToken parameters, RenderArgs dstArgs, RenderArgs srcArgs, System.Drawing.Rectangle[] rois, int startIndex, int length) { CloudsEffectConfigToken token = (CloudsEffectConfigToken)parameters; UserBlendOp blendOp = token.BlendOp; if (blendOp is UserBlendOps.NormalBlendOp && EnvironmentParameters.PrimaryColor.A == 255 && EnvironmentParameters.SecondaryColor.A == 255) { // this is just an optimization blendOp = null; } this.scale = token.Amount1; this.power = token.Amount2 / 100.0f; this.seed = (byte)(token.Seed ^ instanceSeed); for (int i = startIndex; i < startIndex + length; ++i) { RenderClouds(dstArgs.Surface, rois[i]); if (blendOp != null) { blendOp.Apply(dstArgs.Surface, rois[i].Location, srcArgs.Surface, rois[i].Location, dstArgs.Surface, rois[i].Location, rois[i].Size); } } } static CloudsEffect() { for (int i = 0; i < 256; i++) { permuteLookup[256 + i] = permutationTable[i]; permuteLookup[i] = permutationTable[i]; } } // Adapted to 2-D version in C# from 3-D version in Java from http://mrl.nyu.edu/~perlin/noise/ static private int[] permuteLookup = new int[512]; static private int[] permutationTable = new int[] { 151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, 57, 177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74, 165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54, 65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, 200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217, 226, 250, 124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213, 119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43, 172, 9, 129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104, 218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180 }; private static double Fade(double t) { return t * t * t * (t * (t * 6 - 15) + 10); } private static double Grad(int hash, double x, double y) { int h = hash & 15; double u = h < 8 ? x : y; double v = h < 4 ? y : x; return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v); } private static double Noise(byte ix, byte iy, double x, double y, byte seed) { double u = Fade(x); double v = Fade(y); int a = permuteLookup[ix + seed] + iy; int aa = permuteLookup[a]; int ab = permuteLookup[a + 1]; int b = permuteLookup[ix + 1 + seed] + iy; int ba = permuteLookup[b]; int bb = permuteLookup[b + 1]; double gradAA = Grad(permuteLookup[aa], x, y); double gradBA = Grad(permuteLookup[ba], x - 1, y); double edge1 = Utility.Lerp(gradAA, gradBA, u); double gradAB = Grad(permuteLookup[ab], x, y - 1); double gradBB = Grad(permuteLookup[bb], x - 1, y - 1); double edge2 = Utility.Lerp(gradAB, gradBB, u); return Utility.Lerp(edge1, edge2, v); } private unsafe void RenderClouds(Surface surface, Rectangle rect) { ColorBgra colorFrom = EnvironmentParameters.PrimaryColor; ColorBgra colorTo = EnvironmentParameters.SecondaryColor; int w = surface.Width; int h = surface.Height; for (int y = rect.Top; y < rect.Bottom; ++y) { ColorBgra* ptr = surface.GetPointAddressUnchecked(rect.Left, y); int dy = 2 * y - h; for (int x = rect.Left; x < rect.Right; ++x) { int dx = 2 * x - w; double val = 0; double mult = 1; int div = this.scale; for (int i = 0; i < 12 && mult > 0.03 && div > 0; ++i) { double dxr = 65536 + (double)dx / (double)div; double dyr = 65536 + (double)dy / (double)div; int dxd = (int)dxr; int dyd = (int)dyr; dxr -= dxd; dyr -= dyd; double noise = Noise( unchecked((byte)dxd), unchecked((byte)dyd), dxr, //(double)dxr / div, dyr, //(double)dyr / div, (byte)(seed ^ i)); val += noise * mult; div /= 2; mult *= this.power; } *ptr = ColorBgra.Lerp(colorFrom, colorTo, (val + 1) / 2); ++ptr; } } } } }