87 lines
2.6 KiB
C#
87 lines
2.6 KiB
C#
using System.Text;
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using Chip8.Core;
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using Chip8.Core.Export;
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using Xunit;
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namespace Chip8.Tests;
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public class PpmTests
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{
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static int headerLength(byte[] ppm)
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{
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int newlines = 0;
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for (int index = 0; index < ppm.Length; index++)
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{
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if (ppm[index] == (byte)'\n' && ++newlines == 3)
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{
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return index + 1;
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}
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}
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return -1;
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}
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[Fact]
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public void monochromeImageHasCorrectHeaderAndSize()
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{
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var pixels = new bool[2 * 2];
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byte[] ppm = PpmImage.fromMonochrome(pixels, 2, 2, Palette.monochrome());
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string header = Encoding.ASCII.GetString(ppm, 0, headerLength(ppm));
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Assert.Equal("P6\n2 2\n255\n", header);
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Assert.Equal(headerLength(ppm) + 2 * 2 * 3, ppm.Length);
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}
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[Fact]
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public void litAndUnlitPixelsUsePaletteColors()
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{
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var pixels = new bool[] { true, false, false, true };
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var palette = new Palette(new Rgb(1, 2, 3), new Rgb(10, 20, 30));
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byte[] ppm = PpmImage.fromMonochrome(pixels, 2, 2, palette);
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int start = headerLength(ppm);
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Assert.Equal(10, ppm[start]);
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Assert.Equal(20, ppm[start + 1]);
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Assert.Equal(30, ppm[start + 2]);
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Assert.Equal(1, ppm[start + 3]);
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Assert.Equal(2, ppm[start + 4]);
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Assert.Equal(3, ppm[start + 5]);
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}
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[Fact]
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public void scaleMultipliesDimensions()
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{
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var pixels = new bool[1];
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byte[] ppm = PpmImage.fromMonochrome(pixels, 1, 1, Palette.monochrome(), scale: 4);
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string header = Encoding.ASCII.GetString(ppm, 0, headerLength(ppm));
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Assert.Equal("P6\n4 4\n255\n", header);
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Assert.Equal(headerLength(ppm) + 4 * 4 * 3, ppm.Length);
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}
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[Fact]
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public void videoExportUsesColorPlanes()
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{
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var video = new Video();
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video.setResolution(true);
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var sprite = new byte[] { 0x80 };
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video.drawSprite(sprite, 0, 0, 0, 1, 0x2, false);
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byte[] ppm = PpmImage.fromVideo(video, Palette.octo());
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int start = headerLength(ppm);
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Rgb colorTwo = Palette.octo()[2];
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Assert.Equal(colorTwo.r, ppm[start]);
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Assert.Equal(colorTwo.g, ppm[start + 1]);
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Assert.Equal(colorTwo.b, ppm[start + 2]);
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}
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[Fact]
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public void fromMachinePicksMonochromeForChip8()
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{
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var machine = new Machine(Quirks.modern(), 1);
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machine.display[0] = true;
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byte[] ppm = PpmImage.fromMachine(machine, Palette.monochrome());
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int start = headerLength(ppm);
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Assert.Equal(0xFF, ppm[start]);
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}
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}
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