add optimization notes

build.zig

@@ -46,6 +46,10 @@ pub fn build(b: *std.build.Builder) !void {
     exe.addIncludePath("lib/i2cdriver");
     exe.install();
 
+    // TODO: I believe we can use runArtifact on a second
+    // exe with a different source file for font generation
+    // taking us to a series of 5 byte arrays for each
+    // character in a font.
     exe.step.dependOn(&AsciiPrintableStep.create(b, .{ .path = "src/images" }).step);
     // exe.step.dependOn((try fontGeneration(b, target)));
     const run_cmd = exe.run();

src/main.zig

@@ -277,6 +277,12 @@ fn convertImage(alloc: std.mem.Allocator, filename: [:0]u8, pixels: *[WIDTH * HE
     if (filename.len > 0) {
         status = c.MagickReadImage(mw, filename);
     } else {
+        // TODO: if there is no background image AND
+        // we precompute monochrome bit patterns for our font
+        // we can completely avoid ImageMagick here. Even with
+        // a background we can do the conversion, then do our
+        // own text overlay after monochrome conversion.
+        // Faster and smaller binary (maybe multi-font support?)
         const blob = @embedFile("images/blank.bmp");
         status = c.MagickReadImageBlob(mw, blob, blob.len);
     }