add dedicated font generation exe for the build
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2 changed files with 258 additions and 0 deletions
10
build.zig
10
build.zig
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@ -46,6 +46,16 @@ pub fn build(b: *std.build.Builder) !void {
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exe.addIncludePath("lib/i2cdriver");
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exe.install();
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const exe_fontgen = b.addExecutable(.{
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.name = "fontgen",
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.root_source_file = .{ .path = "src/fontgen.zig" },
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.target = target,
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.optimize = optimize,
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});
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exe_fontgen.linkLibrary(im_dep.artifact("MagickWand"));
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exe_fontgen.linkLibrary(z_dep.artifact("z"));
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exe.step.dependOn(&exe_fontgen.run().step);
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// TODO: I believe we can use runArtifact on a second
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// exe with a different source file for font generation
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// taking us to a series of 5 byte arrays for each
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248
src/fontgen.zig
Normal file
248
src/fontgen.zig
Normal file
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@ -0,0 +1,248 @@
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const std = @import("std");
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// The package manager will install headers from our dependency in zig's build
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// cache and include the cache directory as a "-I" option on the build command
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// automatically.
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const c = @cImport({
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@cInclude("MagickWand/MagickWand.h");
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});
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// This is set in two places. If this needs adjustment be sure to change the
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// magick CLI command (where it is a string)
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const GLYPH_WIDTH = 5;
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const GLYPH_HEIGHT = 8;
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pub fn main() !void {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer _ = gpa.deinit();
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const alloc = gpa.allocator();
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//
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// var env = try std.process.getEnvMap(alloc);
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// defer env.deinit();
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// var env_iterator = env.iterator();
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// std.debug.print("\n", .{});
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// while (env_iterator.next()) |entry| {
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// std.debug.print("{s}={s}\n", .{ entry.key_ptr.*, entry.value_ptr.* });
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// }
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// cwd is the root of the project - yay!
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const proj_path = std.fs.cwd(); //.realpath(".", &path_buf);
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// We will assume we own the src/fonts dir in entirety
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proj_path.makeDir("src/fonts/") catch {};
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if (!std.meta.isError(proj_path.statFile("src/fonts/fonts.zig"))) return;
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const generated_file = try proj_path.createFile("src/fonts/fonts.zig", .{
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.read = false,
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.truncate = true,
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.lock = .Exclusive,
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.lock_nonblocking = false,
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.mode = 0o666,
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.intended_io_mode = .blocking,
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});
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defer generated_file.close();
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// We need a temp file for the glyph bmp
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var path_buf: [std.fs.MAX_PATH_BYTES]u8 = undefined;
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const temp_file = try std.fs.path.joinZ(alloc, &[_][]const u8{ try proj_path.realpath("src/fonts/", &path_buf), ".tmp.bmp" });
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defer alloc.free(temp_file);
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defer std.fs.deleteFileAbsolute(temp_file) catch {};
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const file_writer = generated_file.writer();
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var buffered_writer = std.io.bufferedWriter(file_writer);
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defer buffered_writer.flush() catch unreachable;
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const writer = buffered_writer.writer();
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// std.debug.print("cwd: {s}", .{try std.fs.cwd().realpath(".", &path_buf)});
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// const args = try std.process.argsAlloc(alloc);
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// defer std.process.argsFree(alloc, args);
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//
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// const stdout_file = std.io.getStdOut().writer();
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// var bw = std.io.bufferedWriter(stdout_file);
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// const stdout = bw.writer();
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// defer bw.flush() catch unreachable; // don't forget to flush!
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//
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// // try stdout.print("Run `zig build test` to run the tests.\n", .{});
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var pixels: [GLYPH_WIDTH * GLYPH_HEIGHT]u8 = undefined;
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try writer.print("pub const @\"{s}\" = .{{\n", .{"Hack-Regular"});
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// TODO: Read and cache
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for (32..127) |i| {
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// if (i == 32) {
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// try writer.print(" \"\",\n", .{});
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// continue;
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// }
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const char_str = [_]u8{@intCast(u8, i)};
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// Need to escape the following chars: 32 (' ') 92 ('\')
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const label_param = parm: {
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switch (i) {
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32 => break :parm "label:\\ ",
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92 => break :parm "label:\\\\",
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else => break :parm "label:" ++ char_str,
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}
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};
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// generate the file
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// 36 ($) and 81 (Q) are widest and only 9 wide
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// We are chopping the right pixel
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try run(alloc, &[_][]const u8{
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"magick",
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"-background",
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"white",
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"-fill",
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"black",
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"-font",
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"Hack-Regular",
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"-density",
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"72",
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"-pointsize",
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"8",
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label_param,
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"-extent",
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"5x8",
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temp_file,
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});
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// Grab pixels from the file
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try convertImage(temp_file, &pixels);
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packBits(&pixels);
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// unpackBits(&pixels);
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try writer.print(" .@\"{d}\" = &[_]u8{{ ", .{i});
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var first = true;
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for (pixels[0..(GLYPH_WIDTH * GLYPH_HEIGHT / 8)]) |byte| {
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// for (pixels) |byte| { // unpacked only
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if (!first) try writer.print(", ", .{});
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try writer.print("0x{s}", .{std.fmt.bytesToHex(&[_]u8{byte}, .lower)});
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first = false;
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}
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try writer.print(" }},\n", .{});
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}
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try writer.print("}};\n", .{});
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}
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const hi = .{
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.there = &[_]u8{0xff},
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};
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fn run(allocator: std.mem.Allocator, argv: []const []const u8) !void {
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var env_map = try std.process.getEnvMap(allocator);
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defer env_map.deinit();
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var child = std.ChildProcess.init(argv, allocator);
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child.stdin_behavior = .Ignore;
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child.stdout_behavior = .Inherit;
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child.stderr_behavior = .Inherit;
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child.cwd = null; //std.fs.cwd();
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child.env_map = &env_map;
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try child.spawn();
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const result = try child.wait();
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switch (result) {
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.Exited => |code| if (code != 0) {
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std.log.err("command failed with exit code {}", .{code});
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{
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var msg = std.ArrayList(u8).init(allocator);
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defer msg.deinit();
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const writer = msg.writer();
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var prefix: []const u8 = "";
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for (argv) |arg| {
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try writer.print("{s}\"{s}\"", .{ prefix, arg });
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prefix = " ";
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}
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std.log.debug("[RUN] {s}", .{msg.items});
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}
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std.os.exit(0xff);
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},
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else => {
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std.log.err("command failed with: {}", .{result});
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std.os.exit(0xff);
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},
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}
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}
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pub fn unpackBits(pixels: *[GLYPH_WIDTH * GLYPH_HEIGHT]u8) void {
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// bits packed: 0000 0001
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// ^
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// \- most significant bit
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// Need to start at the end and work forward to avoid
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// overwrites
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var i: isize = (GLYPH_WIDTH * GLYPH_HEIGHT / 8 - 1);
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while (i >= 0) {
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const start = @intCast(usize, i) * 8;
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const packed_byte = pixels[@intCast(usize, i)];
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pixels[start + 7] = ((packed_byte & 0b10000000) >> 7) * 0xFF;
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pixels[start + 6] = ((packed_byte & 0b01000000) >> 6) * 0xFF;
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pixels[start + 5] = ((packed_byte & 0b00100000) >> 5) * 0xFF;
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pixels[start + 4] = ((packed_byte & 0b00010000) >> 4) * 0xFF;
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pixels[start + 3] = ((packed_byte & 0b00001000) >> 3) * 0xFF;
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pixels[start + 2] = ((packed_byte & 0b00000100) >> 2) * 0xFF;
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pixels[start + 1] = ((packed_byte & 0b00000010) >> 1) * 0xFF;
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pixels[start + 0] = ((packed_byte & 0b00000001) >> 0) * 0xFF;
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i -= 1;
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}
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}
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fn packBits(pixels: *[GLYPH_WIDTH * GLYPH_HEIGHT]u8) void {
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for (0..(GLYPH_WIDTH * GLYPH_HEIGHT / 8)) |i| {
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const start = i * 8;
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pixels[i] = (pixels[start] & 0b00000001) |
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(pixels[(start + 1)] & 0b00000010) |
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(pixels[(start + 2)] & 0b00000100) |
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(pixels[(start + 3)] & 0b00001000) |
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(pixels[(start + 4)] & 0b00010000) |
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(pixels[(start + 5)] & 0b00100000) |
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(pixels[(start + 6)] & 0b01000000) |
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(pixels[(start + 7)] & 0b10000000);
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}
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}
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fn convertImage(filename: [:0]u8, pixels: *[GLYPH_WIDTH * GLYPH_HEIGHT]u8) !void {
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c.MagickWandGenesis();
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defer c.MagickWandTerminus();
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var mw = c.NewMagickWand();
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defer {
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if (mw) |w| mw = c.DestroyMagickWand(w);
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}
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// Reading an image into ImageMagick is problematic if it isn't a bmp
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// as the library needs a bunch of dependencies available
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var status = c.MagickReadImage(mw, filename);
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if (status == c.MagickFalse) {
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// try reportMagickError(mw);
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return error.CouldNotReadImage;
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}
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// We make the image monochrome by quantizing the image with 2 colors in the
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// gray colorspace. See:
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// https://www.imagemagick.org/Usage/quantize/#monochrome
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// and
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// https://stackoverflow.com/questions/18267432/using-the-c-api-for-imagemagick-on-iphone-to-convert-to-monochrome
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//
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// We do this at the end so we have pure black and white. Otherwise the
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// resizing oprations will generate some greyscale that we don't want
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status = c.MagickQuantizeImage(mw, // MagickWand
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2, // Target number colors
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c.GRAYColorspace, // Colorspace
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1, // Optimal depth
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c.MagickTrue, // Dither
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c.MagickFalse // Quantization error
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);
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if (status == c.MagickFalse)
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return error.CouldNotQuantizeImage;
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status = c.MagickExportImagePixels(mw, 0, 0, GLYPH_WIDTH, GLYPH_HEIGHT, "I", c.CharPixel, @ptrCast(*anyopaque, pixels));
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if (status == c.MagickFalse)
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return error.CouldNotExportImage;
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for (0..GLYPH_WIDTH * GLYPH_HEIGHT) |i| {
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switch (pixels[i]) {
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0x00 => pixels[i] = 0xFF,
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0xFF => pixels[i] = 0x00,
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else => {},
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}
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}
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}
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