60 lines
2.1 KiB
C#
60 lines
2.1 KiB
C#
using Age.Engine.Model;
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using Xunit;
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public class SoftwareAffineRasterizerTests
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{
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[Fact]
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public void BlitRgba_RotatesTwoPixelsClockwiseWithNearestSampling()
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{
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byte[] src = { 255,0,0,255, 0,255,0,255 };
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byte[] dst = new byte[4*4*4];
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var world = Transform2DMath.Build(
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new TransformState(1,1,1,0,0,0,1,1,0, 0,0,1,90));
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SoftwareAffineRasterizer.BlitRgba(dst,4,4,src,2,1,0,0,2,1,
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world.FromLocalOrigin(1,1),0xffffff,0,1);
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Assert.Equal(new byte[] {255,0,0,255}, dst[16..20]);
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Assert.Equal(new byte[] {0,255,0,255}, dst[32..36]);
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}
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[Fact]
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public void FillRgba_UsesAffineShapeRatherThanBoundingBox()
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{
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byte[] dst = new byte[5*5*4];
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var m = new Affine2D(1,0.5,-0.5,1,2,1);
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SoftwareAffineRasterizer.FillRgba(dst,5,5,2,2,m,0xff0000,1);
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int colored = 0;
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for(int i=3;i<dst.Length;i+=4) if(dst[i]!=0) colored++;
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Assert.InRange(colored, 3, 5);
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Assert.Equal(0, dst[(1*5+1)*4+3]);
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}
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[Fact]
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public void BlitRgba_MultiplyTintUsesD3dStyleRgbModulationAndOpacity()
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{
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byte[] src = { 200, 100, 50, 255 };
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byte[] dst = new byte[4];
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SoftwareAffineRasterizer.BlitRgba(dst, 1, 1, src, 1, 1, 0, 0, 1, 1,
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new Affine2D(1, 0, 0, 1, 0, 0), 0x80ff40, 0, 0.5f, multiplyTint: true);
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Assert.InRange(dst[0], 49, 50);
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Assert.InRange(dst[1], 49, 50);
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Assert.InRange(dst[2], 5, 7);
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Assert.InRange(dst[3], 126, 127);
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}
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[Fact]
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public void BlitRgba_WhiteModulationPreservesYellowAndZeroOpacityHidesIt()
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{
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byte[] src = { 240, 192, 16, 255 };
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byte[] visible = new byte[4];
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var identity = new Affine2D(1, 0, 0, 1, 0, 0);
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SoftwareAffineRasterizer.BlitRgba(visible, 1, 1, src, 1, 1, 0, 0, 1, 1,
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identity, 0xffffff, 0, 1, multiplyTint: true);
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Assert.Equal(new byte[] { 240, 192, 16, 255 }, visible);
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byte[] hidden = new byte[4];
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SoftwareAffineRasterizer.BlitRgba(hidden, 1, 1, src, 1, 1, 0, 0, 1, 1,
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identity, 0xffffff, 0, 0, multiplyTint: true);
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Assert.Equal(new byte[4], hidden);
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}
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}
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