remove lanczos and convert to perl, add scripts to find unused strings, better optimised assets script

Signed-off-by: lizzie <lizzie@eden-emu.dev>

tools/README.md

@@ -11,15 +11,16 @@ Tools for Eden and other subprojects.
 - `find-unused-strings.pl`: Find unused strings (for Android XML files).
 - `shellcheck.sh`: Ensure POSIX compliance (and syntax sanity) for all tools in this directory and subdirectories.
 - `llvmpipe-run.sh`: Sets environment variables needed to run any command (or Eden) with llvmpipe.
-- `optimize-assets.sh`: Optimize PNG assets with OptiPng.
+- `optimize-assets.sh`: Optimizes PNG assets with OptiPng.
 - `update-cpm.sh`: Updates CPM.cmake to the latest version.
 - `update-icons.sh`: Rebuild all icons (macOS, Windows, bitmaps) based on the master SVG file (`dist/dev.eden_emu.eden.svg`)
     * Also optimizes the master SVG
     * Requires: `png2icns` (libicns), ImageMagick, [`svgo`](https://github.com/svg/svgo)
 - `dtrace-tool.sh`
-- `lanczos_gen.c`
+- `lanczos-gen.pl`: Generates constants for the Lanczos filter.
 - `clang-format.sh`: Runs `clang-format` on the entire codebase.
     * Requires: clang
+- `find-unused-strings.sh`: Find any unused strings in the Android app (XML -> Kotlin).
 
 ## Android
 It's recommended to run these scritps after almost any Android change, as they are relatively fast and important both for APK bloat and CI.

tools/find-unused-strings.sh

@@ -0,0 +1,7 @@
+#!/bin/sh -e
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+cat src/android/app/src/main/res/values/strings.xml \
+    | grep 'string name="' | awk -F'"' '$0=$2' \
+    | xargs -I {} sh -c 'grep -qirnw R.string.'{}' src/android/app/src || echo '{}

tools/lanczos-gen.pl

@@ -0,0 +1,40 @@
+#!/usr/bin/perl
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+use strict;
+use warnings;
+sub generate_lanczos {
+    my $pi = 3.14159265358979;
+    sub sinc {
+        if ($_[0] eq 0.0) {
+            return 1.0;
+        } else {
+            return sin($pi * $_[0]) / ($pi * $_[0]);
+        }
+    }
+    sub lanczos {
+        my $d = sqrt($_[0] * $_[0] + $_[1] * $_[1]);
+        return sinc($d) / sinc($d / $_[2]);
+    }
+    my $r = 3.0; #radius (1 = 3 steps)
+    my $k_size = ($r * 2.0 + 1.0) * ($r * 2.0 + 1.0);
+    my $w_sum = \0.0;
+    my $factor = 1.0 / ($r + 1.0);
+    #kernel size = (r * 2 + 1) ^ 2
+    printf("const float w_kernel[%i] = float[] (\n    ", $k_size);
+    for (my $x = -$r; $x <= $r; $x++) {
+        for (my $y = -$r; $y <= $r; $y++) {
+            my $w = lanczos($x, $y, $r);
+            printf("%f, ", $w);
+            $w_sum += $w;
+        }
+    }
+    printf("\n);\nconst vec2 w_pos[%i] = vec[](\n    ", $k_size);
+    for (my $x = -$r; $x <= $r; $x++) {
+        for (my $y = -$r; $y <= $r; $y++) {
+            printf("vec2(%f, %f), ", $x * $factor, $y * $factor);
+        }
+    }
+    printf("\n);\nconst float w_sum = %f;\n", $w_sum);
+}
+generate_lanczos;

tools/lanczos_gen.c

@@ -1,48 +0,0 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-// clang -lm tools/lanczos_gen.c -o tools/lanczos_gen && ./tools/lanczos_gen
-#include <stdio.h>
-#include <math.h>
-
-double sinc(double x) {
-    return x == 0.0f ? 1.0f : sin(M_PI * x) / (M_PI * x);
-}
-
-typedef struct vec2 {
-    double x;
-    double y;
-} vec2;
-
-double lanczos(vec2 v, float a) {
-    double d = sqrt(v.x * v.x + v.y * v.y);
-    return sinc(d) / sinc(d / a);
-}
-
-int main(int argc, char* argv[]) {
-    const int r = 3; //radius (1 = 3 steps)
-    const int k_size = (r * 2 + 1) * (r * 2 + 1);
-    double w_sum = 0.0f;
-    // kernel size = (r * 2 + 1) ^ 2
-    printf("const float w_kernel[%i] = float[] (\n    ", k_size);
-    double factor = 1.0f / ((double)r + 1.0f);
-    for (int x = -r; x <= r; x++)
-        for (int y = -r; y <= r; y++) {
-            double w = lanczos((vec2){ .x = x, .y = y }, (double)r);
-            printf("%lff, ", w);
-            w_sum += w;
-        }
-    printf("\n);\n");
-    printf("const vec2 w_pos[%i] = vec2[] (\n    ", k_size);
-    for (int x = -r; x <= r; x++)
-        for (int y = -r; y <= r; y++) {
-            vec2 kp = (vec2){
-                .x = x * factor,
-                .y = y * factor
-            };
-            printf("vec2(%lff, %lff), ", kp.x, kp.y);
-        }
-    printf("\n);\n");
-    printf("const float w_sum = %lff;\n", w_sum);
-    return 0;
-}

tools/optimize-assets.sh

@@ -1,9 +1,5 @@
 #!/bin/sh -e
-
 # SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
 # SPDX-License-Identifier: GPL-3.0-or-later
-
-# Optimizes assets of Eden (requires OptiPng)
-
 which optipng || exit
-find . -type f -name "*.png" -exec optipng -o7 {} \;
+find . -type f -iname '*.png' -print0 | xargs -0 -P 16 -I {} optipng -o7 {}