From 2ded6823b752f53c0d2a9329767e0d81264bce03 Mon Sep 17 00:00:00 2001
From: Fabian Montero <fabian@posixlycorrect.com>
Date: Thu, 13 Feb 2025 19:31:18 -0600
Subject: [PATCH] true initial commit

---
 .gitignore  |   1 +
 Cargo.lock  | 554 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   9 +
 src/main.rs | 107 ++++++++++
 4 files changed, 671 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
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index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
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+ "simd-adler32",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..0e9a3cd
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "factorio_high_contrast_hack"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+clap = { version = "4", features = ["derive"] }
+walkdir = "2"
+image = "0.24"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..493b24c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,107 @@
+use std::error::Error;
+use std::path::Path;
+
+use clap::Parser;
+use image::{GenericImageView, Rgba, RgbaImage};
+use walkdir::WalkDir;
+
+/// This program recursively finds all PNG files in a given directory and
+/// replaces each with a new image that:
+/// - has the same name and dimensions as the original,
+/// - is filled with a solid color equal to the average RGB of the original image’s non-transparent pixels,
+/// - preserves the transparency of the original.
+/// 
+/// You can also provide an optional multiplier for the RGB values as three numbers.
+#[derive(Parser, Debug)]
+#[command(author, version, about)]
+struct Args {
+    /// Path of the directory to process
+    directory: String,
+
+    /// Optional multiplier for RGB values (provide three numbers, e.g., --multiplier 1.0 0.5 1.0)
+    #[arg(short, long, value_parser = clap::value_parser!(f32), num_args = 3)]
+    multiplier: Option<Vec<f32>>,
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let args = Args::parse();
+    // If a multiplier is provided, convert the Vec into a tuple (r, g, b)
+    let multiplier = args.multiplier.map(|v| (v[0], v[1], v[2]));
+
+    // Walk through the directory recursively.
+    for entry in WalkDir::new(&args.directory).into_iter().filter_map(Result::ok) {
+        if entry.file_type().is_file() {
+            let path = entry.path();
+            // Check if the file extension is png (case-insensitive)
+            if path.extension().map_or(false, |ext| ext.eq_ignore_ascii_case("png")) {
+                println!("Processing: {:?}", path);
+                process_image(path, multiplier)?;
+            }
+        }
+    }
+    Ok(())
+}
+
+/// Processes a single image:
+/// - Computes the average RGB of non-transparent pixels.
+/// - Optionally applies an RGB multiplier.
+/// - Creates a new image that uses the computed color in place of all non-transparent pixels,
+///   while preserving each pixel’s original alpha.
+fn process_image(path: &Path, multiplier: Option<(f32, f32, f32)>) -> Result<(), Box<dyn Error>> {
+    // Open the image file
+    let img = image::open(path)?;
+    // Convert to an RGBA8 image for easy per-pixel manipulation.
+    let img_rgba = img.to_rgba8();
+    let (width, height) = img_rgba.dimensions();
+
+    // Calculate the average color of non-transparent pixels.
+    let (mut sum_r, mut sum_g, mut sum_b, mut count) = (0u64, 0u64, 0u64, 0u64);
+    for pixel in img_rgba.pixels() {
+        let [r, g, b, a] = pixel.0;
+        if a != 0 {
+            sum_r += r as u64;
+            sum_g += g as u64;
+            sum_b += b as u64;
+            count += 1;
+        }
+    }
+    let (avg_r, avg_g, avg_b) = if count > 0 {
+        (
+            (sum_r / count) as u8,
+            (sum_g / count) as u8,
+            (sum_b / count) as u8,
+        )
+    } else {
+        (0, 0, 0)
+    };
+
+    // Apply the multiplier if provided.
+    let (final_r, final_g, final_b) = if let Some((mr, mg, mb)) = multiplier {
+        (
+            ((avg_r as f32 * mr).min(255.0)).round() as u8,
+            ((avg_g as f32 * mg).min(255.0)).round() as u8,
+            ((avg_b as f32 * mb).min(255.0)).round() as u8,
+        )
+    } else {
+        (avg_r, avg_g, avg_b)
+    };
+
+    // Create a new image with the same dimensions.
+    let mut new_img = RgbaImage::new(width, height);
+    // For every pixel in the original image:
+    // - If the pixel is transparent (alpha == 0), leave it transparent.
+    // - Otherwise, use the computed solid color while preserving the original alpha.
+    for (x, y, pixel) in img_rgba.enumerate_pixels() {
+        let a = pixel.0[3];
+        if a == 0 {
+            new_img.put_pixel(x, y, Rgba([0, 0, 0, 0]));
+        } else {
+            new_img.put_pixel(x, y, Rgba([final_r, final_g, final_b, a]));
+        }
+    }
+
+    // Overwrite the original image file with the new image.
+    new_img.save(path)?;
+
+    Ok(())
+}