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massively speed up image construction

This commit is contained in:
profan 2026-05-25 11:47:36 +01:00
parent c50b009eaa
commit b576f44fea
1 changed files with 3 additions and 13 deletions
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16
Program.cs
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@ -3,6 +3,7 @@ using System.Collections.Generic;
using System.Diagnostics; using System.Diagnostics;
using System.Globalization; using System.Globalization;
using System.IO; using System.IO;
using System.Linq;
using System.Numerics; using System.Numerics;
using System.Reflection; using System.Reflection;
using System.Reflection.Emit; using System.Reflection.Emit;
@ -35,19 +36,8 @@ Console.WriteLine($"Sharpero took: {timeTakenSecondsOutput} seconds to write out
void CreateOutputImage(int imageSize, float[] imageData, string imageOutputPath) void CreateOutputImage(int imageSize, float[] imageData, string imageOutputPath)
{ {
// #TODO: remove bitmap usage as this draws through a canvas every time, can we just set the pixel data directly? byte[] imageDataBytes = imageData.Select(p => (byte)(p < 0 ? 255 : 0)).ToArray();
using SKBitmap bitmap = new SKBitmap(imageSize, imageSize, isOpaque: true); using var image = SKImage.FromPixelCopy(new SKImageInfo(imageSize, imageSize, SKColorType.Gray8), imageDataBytes);
for (int x = 0; x < imageSize; ++x)
{
for (int y = 0; y < imageSize; ++y)
{
byte v = imageData[Parsing.CoordToIndex(x, y, width: imageSize)] < 0 ? (byte)255 : (byte)0;
SKColor c = new SKColor(v, v, v, 255);
bitmap.SetPixel(x, y, c);
}
}
using var image = SKImage.FromBitmap(bitmap);
using var data = image.Encode(SKEncodedImageFormat.Jpeg, 100); using var data = image.Encode(SKEncodedImageFormat.Jpeg, 100);
using var stream = File.OpenWrite(imageOutputPath); using var stream = File.OpenWrite(imageOutputPath);
data.SaveTo(stream); data.SaveTo(stream);