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Optimize identity raster paths

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gamer147
2026-07-11 15:31:56 -04:00
parent 4be116e432
commit 7c0495c88d
3 changed files with 190 additions and 4 deletions
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100
engine/Age.Engine.Tests/SoftwareAffineRasterizerTests.cs
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@@ -3,6 +3,48 @@ using Xunit;
public class SoftwareAffineRasterizerTests
{
[Theory]
[InlineData(-1, 2, false)]
[InlineData(4, -1, false)]
[InlineData(1, 1, true)]
public void BlitRgba_IntegerTranslationFastPath_MatchesGeneralAffine(int tx, int ty, bool multiplyTint)
{
byte[] src = new byte[5 * 4 * 4];
for (int i = 0; i < src.Length; i += 4)
{
src[i] = (byte)(20 + i % 211); src[i + 1] = (byte)(70 + i % 173);
src[i + 2] = (byte)(130 + i % 107); src[i + 3] = (byte)(40 + i % 216);
}
byte[] expected = new byte[6 * 5 * 4];
for (int i = 0; i < expected.Length; i++) expected[i] = (byte)(i * 17 + 3);
byte[] actual = (byte[])expected.Clone();
var translation = new Affine2D(1, 0, 0, 1, tx, ty);
ReferenceBlit(expected, 6, 5, src, 5, 1, 1, 3, 2, translation,
0x4080c0, 0.35f, 0.6f, multiplyTint);
SoftwareAffineRasterizer.BlitRgba(actual, 6, 5, src, 5, 4, 1, 1, 3, 2, translation,
0x4080c0, 0.35f, 0.6f, multiplyTint);
Assert.Equal(expected, actual);
}
[Theory]
[InlineData(-2, 1)]
[InlineData(4, -1)]
[InlineData(1, 2)]
public void FillRgba_IntegerTranslationFastPath_MatchesGeneralAffine(int tx, int ty)
{
byte[] expected = new byte[6 * 5 * 4];
for (int i = 0; i < expected.Length; i++) expected[i] = (byte)(i * 11 + 5);
byte[] actual = (byte[])expected.Clone();
var translation = new Affine2D(1, 0, 0, 1, tx, ty);
ReferenceFill(expected, 6, 5, 4, 3, translation, 0x9a4f21, 0.42f);
SoftwareAffineRasterizer.FillRgba(actual, 6, 5, 4, 3, translation, 0x9a4f21, 0.42f);
Assert.Equal(expected, actual);
}
[Fact]
public void BlitRgba_RotatesTwoPixelsClockwiseWithNearestSampling()
{
@@ -56,4 +98,62 @@ public class SoftwareAffineRasterizerTests
identity, 0xffffff, 0, 0, multiplyTint: true);
Assert.Equal(new byte[4], hidden);
}
// Pre-fast-path affine algorithm retained here as an independent differential oracle.
private static void ReferenceBlit(byte[] dst, int dstW, int dstH, byte[] src, int srcW,
int srcX, int srcY, int width, int height, Affine2D transform,
long tint, float tintStrength, float opacity, bool multiplyTint)
{
if (!transform.TryInverse(out var inv)) return;
ReferenceBounds(transform, width, height, dstW, dstH, out int x0, out int y0, out int x1, out int y1);
int istr = (int)(System.Math.Clamp(tintStrength, 0f, 1f) * 255);
int ia = (int)(System.Math.Clamp(opacity, 0f, 1f) * 255);
int tr = (int)(tint >> 16 & 255), tg = (int)(tint >> 8 & 255), tb = (int)(tint & 255);
for (int y = y0; y < y1; y++) for (int x = x0; x < x1; x++)
{
var p = inv.Apply(x + 0.5, y + 0.5);
int u = (int)System.Math.Floor(p.X), v = (int)System.Math.Floor(p.Y);
if ((uint)u >= (uint)width || (uint)v >= (uint)height) continue;
int si = ((srcY + v) * srcW + (srcX + u)) * 4, di = (y * dstW + x) * 4;
int sa = src[si + 3] * ia / 255;
if (sa == 0) continue;
int sr = multiplyTint ? src[si] * tr / 255 : (src[si] * (255 - istr) + tr * istr) / 255;
int sg = multiplyTint ? src[si + 1] * tg / 255 : (src[si + 1] * (255 - istr) + tg * istr) / 255;
int sb = multiplyTint ? src[si + 2] * tb / 255 : (src[si + 2] * (255 - istr) + tb * istr) / 255;
ReferenceBlend(dst, di, sr, sg, sb, sa);
}
}
private static void ReferenceFill(byte[] dst, int dstW, int dstH, int width, int height,
Affine2D transform, long color, float opacity)
{
if (!transform.TryInverse(out var inv)) return;
ReferenceBounds(transform, width, height, dstW, dstH, out int x0, out int y0, out int x1, out int y1);
int a = (int)(System.Math.Clamp(opacity, 0f, 1f) * 255);
int r = (int)(color >> 16 & 255), g = (int)(color >> 8 & 255), b = (int)(color & 255);
for (int y = y0; y < y1; y++) for (int x = x0; x < x1; x++)
{
var p = inv.Apply(x + 0.5, y + 0.5);
if (p.X >= 0 && p.X < width && p.Y >= 0 && p.Y < height)
ReferenceBlend(dst, (y * dstW + x) * 4, r, g, b, a);
}
}
private static void ReferenceBounds(Affine2D m, int w, int h, int dw, int dh,
out int x0, out int y0, out int x1, out int y1)
{
var a = m.Apply(0, 0); var b = m.Apply(w, 0); var c = m.Apply(0, h); var d = m.Apply(w, h);
x0 = System.Math.Max(0, (int)System.Math.Floor(System.Math.Min(System.Math.Min(a.X, b.X), System.Math.Min(c.X, d.X))));
y0 = System.Math.Max(0, (int)System.Math.Floor(System.Math.Min(System.Math.Min(a.Y, b.Y), System.Math.Min(c.Y, d.Y))));
x1 = System.Math.Min(dw, (int)System.Math.Ceiling(System.Math.Max(System.Math.Max(a.X, b.X), System.Math.Max(c.X, d.X))));
y1 = System.Math.Min(dh, (int)System.Math.Ceiling(System.Math.Max(System.Math.Max(a.Y, b.Y), System.Math.Max(c.Y, d.Y))));
}
private static void ReferenceBlend(byte[] dst, int i, int r, int g, int b, int a)
{
dst[i] = (byte)((r * a + dst[i] * (255 - a)) / 255);
dst[i + 1] = (byte)((g * a + dst[i + 1] * (255 - a)) / 255);
dst[i + 2] = (byte)((b * a + dst[i + 2] * (255 - a)) / 255);
dst[i + 3] = (byte)System.Math.Min(255, dst[i + 3] + a);
}
}