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增加透明度参数

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This commit is contained in:
ww-rm
2025-10-27 23:33:25 +08:00
parent 29d7e8d9d8
commit 617157044c
3 changed files with 75 additions and 29 deletions
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61
SpineViewerCLI/CanvasAscii.cs
View File

@@ -1,4 +1,5 @@
using Spectre.Console;
using SkiaSharp;
using Spectre.Console;
using Spectre.Console.Rendering;
using System;
using System.Collections.Generic;
@@ -10,7 +11,7 @@ namespace SpineViewerCLI
{
public class CanvasAscii : Renderable
{
private readonly Color?[,] _pixels;
private readonly SKColor?[,] _pixels;
/// <summary>
/// Gets the width of the canvas.
@@ -39,9 +40,14 @@ namespace SpineViewerCLI
public int PixelWidth { get; set; } = 2;
/// <summary>
/// Gets or sets the pixel lettters, ordered by transparency.
/// Gets or sets the pixel characters, ordered by transparency.
/// </summary>
public string PixelLetters { get; set; } = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/|()1{}[]?-_+~<>i!lI;:,^`'."; // ".:-=+*#%@" ... "@%#*+=-:."
public string PixelCharacters { get; set; } = ".,:;-=+*?oSXBGWM$&%#@";
/// <summary>
/// Whether to use pixel characters instead of spaces.
/// </summary>
public bool UsePixelCharacters { get; set; } = false;
/// <summary>
/// Initializes a new instance of the <see cref="CanvasAscii"/> class.
@@ -63,7 +69,7 @@ namespace SpineViewerCLI
Width = width;
Height = height;
_pixels = new Color?[Width, Height];
_pixels = new SKColor?[Width, Height];
}
/// <summary>
@@ -73,7 +79,7 @@ namespace SpineViewerCLI
/// <param name="y">The Y coordinate for the pixel.</param>
/// <param name="color">The pixel color.</param>
/// <returns>The same <see cref="CanvasAscii"/> instance so that multiple calls can be chained.</returns>
public CanvasAscii SetPixel(int x, int y, Color color)
public CanvasAscii SetPixel(int x, int y, SKColor color)
{
_pixels[x, y] = color;
return this;
@@ -105,7 +111,7 @@ namespace SpineViewerCLI
throw new InvalidOperationException("Pixel width must be greater than zero.");
}
if (PixelLetters.Length <= 0)
if (UsePixelCharacters && PixelCharacters.Length <= 0)
{
throw new InvalidOperationException("Pixel letters can't be empty.");
}
@@ -141,6 +147,8 @@ namespace SpineViewerCLI
pixels = ScaleDown(width, height);
}
if (UsePixelCharacters)
{
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
@@ -148,7 +156,8 @@ namespace SpineViewerCLI
var color = pixels[x, y];
if (color.HasValue)
{
yield return new Segment(emptyPixel, new Style(background: color));
var c = color.Value;
yield return new Segment(GetPixelChar(c), new Style(foreground: new(c.Red, c.Green, c.Blue)));
}
else
{
@@ -159,10 +168,32 @@ namespace SpineViewerCLI
yield return Segment.LineBreak;
}
}
private Color?[,] ScaleDown(int newWidth, int newHeight)
else
{
var buffer = new Color?[newWidth, newHeight];
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
var color = pixels[x, y];
if (color.HasValue)
{
var c = color.Value;
yield return new Segment(emptyPixel, new Style(background: new(c.Red, c.Green, c.Blue)));
}
else
{
yield return new Segment(emptyPixel);
}
}
yield return Segment.LineBreak;
}
}
}
private SKColor?[,] ScaleDown(int newWidth, int newHeight)
{
var buffer = new SKColor?[newWidth, newHeight];
var xRatio = ((Width << 16) / newWidth) + 1;
var yRatio = ((Height << 16) / newHeight) + 1;
@@ -177,12 +208,10 @@ namespace SpineViewerCLI
return buffer;
}
private static float GetBrightness(Color c) => (0.299f * c.R + 0.587f * c.G + 0.114f * c.B) / 255f;
private string GetPixelLetter(Color c)
private string GetPixelChar(SKColor c)
{
var index = Math.Min((int)(GetBrightness(c) * PixelLetters.Length), PixelLetters.Length - 1);
return new(PixelLetters[index], PixelWidth);
var index = Math.Min((int)(c.Alpha / 255f * PixelCharacters.Length), PixelCharacters.Length - 1);
return new(PixelCharacters[index], PixelWidth);
}
}
}

18
SpineViewerCLI/CanvasImageAscii.cs
View File

@@ -33,6 +33,16 @@ namespace SpineViewerCLI
/// </summary>
public int PixelWidth { get; set; } = 2;
/// <summary>
/// Gets or sets the pixel characters, ordered by transparency.
/// </summary>
public string PixelCharacters { get; set; } = ".,:;-=+*?oSXBGWM$&%#@";
/// <summary>
/// Whether to use pixel characters instead of spaces.
/// </summary>
public bool UsePixelCharacters { get; set; } = false;
/// <summary>
/// Gets or sets the <see cref="SKSamplingOptions"/> that should
/// be used when scaling the image. Defaults to bicubic sampling.
@@ -127,13 +137,15 @@ namespace SpineViewerCLI
{
MaxWidth = MaxWidth,
PixelWidth = PixelWidth,
PixelCharacters = PixelCharacters,
UsePixelCharacters = UsePixelCharacters,
Scale = false,
};
// XXX: 也许是 SkiaSharp@3.119.0 的 bug, 此处像素值一定是非预乘的格式
for (var x = 0; x < image.Width; x++)
{
for (var y = 0; y < image.Height; y++)
{
for (var x = 0; x < image.Width; x++)
{
var p = image.GetPixel(x, y);
if (p.Alpha == 0) continue;
@@ -141,7 +153,7 @@ namespace SpineViewerCLI
byte r = (byte)(p.Red * a);
byte g = (byte)(p.Green * a);
byte b = (byte)(p.Blue * a);
canvas.SetPixel(x, y, new(r, g, b));
canvas.SetPixel(x, y, new(r, g, b, p.Alpha));
}
}

7
SpineViewerCLI/PreviewCommand.cs
View File

@@ -53,6 +53,11 @@ namespace SpineViewerCLI
DefaultValueFactory = _ => 0f,
};
public Option<bool> OptUseChars { get; } = new("--use-chars")
{
Description = "Whether to use characters instead of colored spaces for pixels",
};
public PreviewCommand() : base(_name, _desc)
{
OptTime.Validators.Add(r =>
@@ -99,7 +104,7 @@ namespace SpineViewerCLI
using var exporter = GetExporterFilledWithArgs(result, spine);
using var skImage = exporter.ExportMemoryImage(spine);
var img = new CanvasImageAscii(skImage);
var img = new CanvasImageAscii(skImage) { UsePixelCharacters = result.GetValue(OptUseChars) };
AnsiConsole.Write(img);
}