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1
.gitignore vendored
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@ -2,4 +2,3 @@ zig-cache/
zig-out/ zig-out/
core core
src/images/* src/images/*
src/fonts/

18
build.zig
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@ -46,18 +46,12 @@ pub fn build(b: *std.build.Builder) !void {
exe.addIncludePath("lib/i2cdriver"); exe.addIncludePath("lib/i2cdriver");
exe.install(); exe.install();
const exe_fontgen = b.addExecutable(.{ // TODO: I believe we can use runArtifact on a second
.name = "fontgen", // exe with a different source file for font generation
.root_source_file = .{ .path = "src/fontgen.zig" }, // taking us to a series of 5 byte arrays for each
.target = target, // character in a font.
.optimize = optimize, exe.step.dependOn(&AsciiPrintableStep.create(b, .{ .path = "src/images" }).step);
}); // exe.step.dependOn((try fontGeneration(b, target)));
exe_fontgen.linkLibrary(im_dep.artifact("MagickWand"));
exe_fontgen.linkLibrary(z_dep.artifact("z"));
exe.step.dependOn(&exe_fontgen.run().step);
// If image based characters are needed, uncomment this
// exe.step.dependOn(&AsciiPrintableStep.create(b, .{ .path = "src/images" }).step);
const run_cmd = exe.run(); const run_cmd = exe.run();
run_cmd.step.dependOn(b.getInstallStep()); run_cmd.step.dependOn(b.getInstallStep());
if (b.args) |args| { if (b.args) |args| {

14
src/display.zig
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@ -1,14 +0,0 @@
// Image specifications
pub const WIDTH = 128;
pub const HEIGHT = 64;
// Text specifications
pub const FONT_WIDTH = 5;
pub const FONT_HEIGHT = 8;
pub const CHARS_PER_LINE = 25; // 25 * 5 = 125 so we have 3px left over
pub const BORDER_LEFT = 1; // 1 empty px left, 2 empty on right
pub const LINES = 8;
// Device specifications
pub const PAGES = 8;

250
src/fontgen.zig
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@ -1,250 +0,0 @@
const std = @import("std");
// The package manager will install headers from our dependency in zig's build
// cache and include the cache directory as a "-I" option on the build command
// automatically.
const c = @cImport({
@cInclude("MagickWand/MagickWand.h");
});
const display = @import("display.zig");
// This is set in two places. If this needs adjustment be sure to change the
// magick CLI command (where it is a string)
const GLYPH_WIDTH = display.FONT_WIDTH;
const GLYPH_HEIGHT = display.FONT_HEIGHT;
pub fn main() !void {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
const alloc = gpa.allocator();
//
// var env = try std.process.getEnvMap(alloc);
// defer env.deinit();
// var env_iterator = env.iterator();
// std.debug.print("\n", .{});
// while (env_iterator.next()) |entry| {
// std.debug.print("{s}={s}\n", .{ entry.key_ptr.*, entry.value_ptr.* });
// }
// cwd is the root of the project - yay!
const proj_path = std.fs.cwd(); //.realpath(".", &path_buf);
// We will assume we own the src/fonts dir in entirety
proj_path.makeDir("src/fonts/") catch {};
if (!std.meta.isError(proj_path.statFile("src/fonts/fonts.zig"))) return;
const generated_file = try proj_path.createFile("src/fonts/fonts.zig", .{
.read = false,
.truncate = true,
.lock = .Exclusive,
.lock_nonblocking = false,
.mode = 0o666,
.intended_io_mode = .blocking,
});
defer generated_file.close();
// We need a temp file for the glyph bmp
var path_buf: [std.fs.MAX_PATH_BYTES]u8 = undefined;
const temp_file = try std.fs.path.joinZ(alloc, &[_][]const u8{ try proj_path.realpath("src/fonts/", &path_buf), ".tmp.bmp" });
defer alloc.free(temp_file);
defer std.fs.deleteFileAbsolute(temp_file) catch {};
const file_writer = generated_file.writer();
var buffered_writer = std.io.bufferedWriter(file_writer);
defer buffered_writer.flush() catch unreachable;
const writer = buffered_writer.writer();
// std.debug.print("cwd: {s}", .{try std.fs.cwd().realpath(".", &path_buf)});
// const args = try std.process.argsAlloc(alloc);
// defer std.process.argsFree(alloc, args);
//
// const stdout_file = std.io.getStdOut().writer();
// var bw = std.io.bufferedWriter(stdout_file);
// const stdout = bw.writer();
// defer bw.flush() catch unreachable; // don't forget to flush!
//
// // try stdout.print("Run `zig build test` to run the tests.\n", .{});
var pixels: [GLYPH_WIDTH * GLYPH_HEIGHT]u8 = undefined;
try writer.print("pub const @\"{s}\" = .{{\n", .{"Hack-Regular"});
// TODO: Read and cache
for (32..127) |i| {
// if (i == 32) {
// try writer.print(" \"\",\n", .{});
// continue;
// }
const char_str = [_]u8{@intCast(u8, i)};
// Need to escape the following chars: 32 (' ') 92 ('\')
const label_param = parm: {
switch (i) {
32 => break :parm "label:\\ ",
92 => break :parm "label:\\\\",
else => break :parm "label:" ++ char_str,
}
};
// generate the file
// 36 ($) and 81 (Q) are widest and only 9 wide
// We are chopping the right pixel
try run(alloc, &[_][]const u8{
"magick",
"-background",
"white",
"-fill",
"black",
"-font",
"Hack-Regular",
"-density",
"72",
"-pointsize",
"8",
label_param,
"-extent",
"5x8",
temp_file,
});
// Grab pixels from the file
try convertImage(temp_file, &pixels);
packBits(&pixels);
// unpackBits(&pixels);
try writer.print(" .@\"{d}\" = &[_]u8{{ ", .{i});
var first = true;
for (pixels[0..(GLYPH_WIDTH * GLYPH_HEIGHT / 8)]) |byte| {
// for (pixels) |byte| { // unpacked only
if (!first) try writer.print(", ", .{});
try writer.print("0x{s}", .{std.fmt.bytesToHex(&[_]u8{byte}, .lower)});
first = false;
}
try writer.print(" }},\n", .{});
}
try writer.print("}};\n", .{});
}
const hi = .{
.there = &[_]u8{0xff},
};
fn run(allocator: std.mem.Allocator, argv: []const []const u8) !void {
var env_map = try std.process.getEnvMap(allocator);
defer env_map.deinit();
var child = std.ChildProcess.init(argv, allocator);
child.stdin_behavior = .Ignore;
child.stdout_behavior = .Inherit;
child.stderr_behavior = .Inherit;
child.cwd = null; //std.fs.cwd();
child.env_map = &env_map;
try child.spawn();
const result = try child.wait();
switch (result) {
.Exited => |code| if (code != 0) {
std.log.err("command failed with exit code {}", .{code});
{
var msg = std.ArrayList(u8).init(allocator);
defer msg.deinit();
const writer = msg.writer();
var prefix: []const u8 = "";
for (argv) |arg| {
try writer.print("{s}\"{s}\"", .{ prefix, arg });
prefix = " ";
}
std.log.debug("[RUN] {s}", .{msg.items});
}
std.os.exit(0xff);
},
else => {
std.log.err("command failed with: {}", .{result});
std.os.exit(0xff);
},
}
}
pub fn unpackBits(pixels: *[GLYPH_WIDTH * GLYPH_HEIGHT]u8) void {
// bits packed: 0000 0001
// ^
// \- most significant bit
// Need to start at the end and work forward to avoid
// overwrites
var i: isize = (GLYPH_WIDTH * GLYPH_HEIGHT / 8 - 1);
while (i >= 0) {
const start = @intCast(usize, i) * 8;
const packed_byte = pixels[@intCast(usize, i)];
pixels[start + 7] = ((packed_byte & 0b10000000) >> 7) * 0xFF;
pixels[start + 6] = ((packed_byte & 0b01000000) >> 6) * 0xFF;
pixels[start + 5] = ((packed_byte & 0b00100000) >> 5) * 0xFF;
pixels[start + 4] = ((packed_byte & 0b00010000) >> 4) * 0xFF;
pixels[start + 3] = ((packed_byte & 0b00001000) >> 3) * 0xFF;
pixels[start + 2] = ((packed_byte & 0b00000100) >> 2) * 0xFF;
pixels[start + 1] = ((packed_byte & 0b00000010) >> 1) * 0xFF;
pixels[start + 0] = ((packed_byte & 0b00000001) >> 0) * 0xFF;
i -= 1;
}
}
fn packBits(pixels: *[GLYPH_WIDTH * GLYPH_HEIGHT]u8) void {
for (0..(GLYPH_WIDTH * GLYPH_HEIGHT / 8)) |i| {
const start = i * 8;
pixels[i] = (pixels[start] & 0b00000001) |
(pixels[(start + 1)] & 0b00000010) |
(pixels[(start + 2)] & 0b00000100) |
(pixels[(start + 3)] & 0b00001000) |
(pixels[(start + 4)] & 0b00010000) |
(pixels[(start + 5)] & 0b00100000) |
(pixels[(start + 6)] & 0b01000000) |
(pixels[(start + 7)] & 0b10000000);
}
}
fn convertImage(filename: [:0]u8, pixels: *[GLYPH_WIDTH * GLYPH_HEIGHT]u8) !void {
c.MagickWandGenesis();
defer c.MagickWandTerminus();
var mw = c.NewMagickWand();
defer {
if (mw) |w| mw = c.DestroyMagickWand(w);
}
// Reading an image into ImageMagick is problematic if it isn't a bmp
// as the library needs a bunch of dependencies available
var status = c.MagickReadImage(mw, filename);
if (status == c.MagickFalse) {
// try reportMagickError(mw);
return error.CouldNotReadImage;
}
// We make the image monochrome by quantizing the image with 2 colors in the
// gray colorspace. See:
// https://www.imagemagick.org/Usage/quantize/#monochrome
// and
// https://stackoverflow.com/questions/18267432/using-the-c-api-for-imagemagick-on-iphone-to-convert-to-monochrome
//
// We do this at the end so we have pure black and white. Otherwise the
// resizing oprations will generate some greyscale that we don't want
status = c.MagickQuantizeImage(mw, // MagickWand
2, // Target number colors
c.GRAYColorspace, // Colorspace
1, // Optimal depth
c.MagickTrue, // Dither
c.MagickFalse // Quantization error
);
if (status == c.MagickFalse)
return error.CouldNotQuantizeImage;
status = c.MagickExportImagePixels(mw, 0, 0, GLYPH_WIDTH, GLYPH_HEIGHT, "I", c.CharPixel, @ptrCast(*anyopaque, pixels));
if (status == c.MagickFalse)
return error.CouldNotExportImage;
for (0..GLYPH_WIDTH * GLYPH_HEIGHT) |i| {
switch (pixels[i]) {
0x00 => pixels[i] = 0xFF,
0xFF => pixels[i] = 0x00,
else => {},
}
}
}

338
src/main.zig
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@ -1,22 +1,5 @@
const std = @import("std"); const std = @import("std");
const display = @import("display.zig"); const chars = @import("images/images.zig").chars;
// Disabling the image characters. To re-enabel, switch the import back and
// adjust build.zig
const chars = &[_][]const u8{""}; //@import("images/images.zig").chars;
const fonts = @import("fonts/fonts.zig");
const unpackBits = @import("fontgen.zig").unpackBits;
const DEFAULT_FONT = "Hack-Regular";
const supported_fonts = @typeInfo(fonts).Struct.decls;
// Specifying the size here works, but will cause problems later if we want, for example,
// 2x heigh font size. But...we would need a slice, which is runtime known, and will
// require an array -> slice conversion and additional allocations, etc, etc.
// So for now, we'll keep this specified so we can simply use a pointer
const FontInnerHash = std.AutoHashMap(u21, *const [display.FONT_WIDTH * display.FONT_HEIGHT / 8]u8);
var font_map: ?std.StringHashMap(?*FontInnerHash) = null;
var font_arena: ?std.heap.ArenaAllocator = null;
// The package manager will install headers from our dependency in zig's build // The package manager will install headers from our dependency in zig's build
// cache and include the cache directory as a "-I" option on the build command // cache and include the cache directory as a "-I" option on the build command
@ -26,7 +9,22 @@ const c = @cImport({
@cInclude("i2cdriver.h"); @cInclude("i2cdriver.h");
}); });
var lines: [display.LINES]*[:0]u8 = undefined; // Image specifications
const WIDTH = 128;
const HEIGHT = 64;
// Text specifications
const FONT_WIDTH = 5;
const FONT_HEIGHT = 8;
const CHARS_PER_LINE = 25; // 25 * 5 = 125 so we have 3px left over
const BORDER_LEFT = 1; // 1 empty px left, 2 empty on right
const LINES = 8;
// Device specifications
const PAGES = 8;
var lines: [LINES]*[:0]u8 = undefined;
fn usage(args: [][]u8) !void { fn usage(args: [][]u8) !void {
const writer = std.io.getStdErr().writer(); const writer = std.io.getStdErr().writer();
@ -40,7 +38,6 @@ const Options = struct {
device_file: [:0]u8, device_file: [:0]u8,
}; };
pub fn main() !void { pub fn main() !void {
defer deinit();
const alloc = std.heap.c_allocator; const alloc = std.heap.c_allocator;
//defer alloc.deinit(); //defer alloc.deinit();
const args = try std.process.argsAlloc(alloc); const args = try std.process.argsAlloc(alloc);
@ -55,10 +52,10 @@ pub fn main() !void {
// we take command line options. So cli will overwrite any lines specified // we take command line options. So cli will overwrite any lines specified
// from the file // from the file
const stdin_file = std.io.getStdIn(); const stdin_file = std.io.getStdIn();
var stdin_data: [display.WIDTH * display.HEIGHT + 1]u8 = undefined; var stdin_data: [WIDTH * HEIGHT + 1]u8 = undefined;
// Need this to support deallocation of memory // Need this to support deallocation of memory
var line_inx: usize = 0; var line_inx: usize = 0;
var stdin_lines: [display.LINES][:0]u8 = undefined; var stdin_lines: [LINES][:0]u8 = undefined;
defer { defer {
for (0..line_inx) |i| { for (0..line_inx) |i| {
alloc.free(stdin_lines[i]); alloc.free(stdin_lines[i]);
@ -83,12 +80,12 @@ pub fn main() !void {
line_inx += 1; line_inx += 1;
} }
} }
std.debug.print("delme: {s}\n", .{lines[0].*});
const opts = try processArgs(alloc, args, &lines); const opts = try processArgs(alloc, args, &lines);
defer alloc.destroy(opts); defer alloc.destroy(opts);
if (opts.background_filename.len > 0) try stdout.print("Converting {s}\n", .{opts.background_filename}); if (opts.background_filename.len > 0) try stdout.print("Converting {s}\n", .{opts.background_filename});
var pixels: [display.WIDTH * display.HEIGHT]u8 = undefined; var pixels: [WIDTH * HEIGHT]u8 = undefined;
try convertImage(opts.background_filename, &pixels, noTextForLine); try convertImage(opts.background_filename, &pixels, textForLine);
try addTextToImage(alloc, &pixels, &lines);
try bw.flush(); try bw.flush();
// We should take the linux device file here, then inspect for ttyUSB vs // We should take the linux device file here, then inspect for ttyUSB vs
@ -98,23 +95,7 @@ pub fn main() !void {
// try stdout.print("Run `zig build test` to run the tests.\n", .{}); // try stdout.print("Run `zig build test` to run the tests.\n", .{});
} }
fn deinit() void { fn processArgs(allocator: std.mem.Allocator, args: [][:0]u8, line_array: *[LINES]*const [:0]u8) !*Options {
if (font_map == null or font_arena == null) return;
// var it = font_map.?.keyIterator();
// while (it.next()) |key| {
// // if (font_map.?.get(key.*).?) |font| {
// // std.debug.print("delme: {s}: {*}\n", .{ key.*, font });
// // font.deinit();
// // }
// }
font_map.?.deinit();
font_map = null;
font_arena.?.deinit();
font_arena = null;
}
fn processArgs(allocator: std.mem.Allocator, args: [][:0]u8, line_array: *[display.LINES]*const [:0]u8) !*Options {
if (args.len < 2) try usage(args); if (args.len < 2) try usage(args);
const prefix = "/dev/ttyUSB"; const prefix = "/dev/ttyUSB";
var opts = try allocator.create(Options); var opts = try allocator.create(Options);
@ -138,10 +119,10 @@ fn processArgs(allocator: std.mem.Allocator, args: [][:0]u8, line_array: *[displ
continue; continue;
} }
if (line_number) |line| { if (line_number) |line| {
if (arg.len > display.CHARS_PER_LINE) { if (arg.len > CHARS_PER_LINE) {
try std.io.getStdErr().writer().print( try std.io.getStdErr().writer().print(
"ERROR: text for line {d} has {d} chars, exceeding maximum length {d}\n", "ERROR: text for line {d} has {d} chars, exceeding maximum length {d}\n",
.{ line, arg.len, display.CHARS_PER_LINE }, .{ line, arg.len, CHARS_PER_LINE },
); );
std.os.exit(1); std.os.exit(1);
} }
@ -161,117 +142,6 @@ fn areDigits(bytes: []u8) bool {
return true; return true;
} }
fn addTextToImage(allocator: std.mem.Allocator, pixels: *[display.WIDTH * display.HEIGHT]u8, data: []*[]u8) !void {
var maybe_font_data = try getFontData(allocator, DEFAULT_FONT);
if (maybe_font_data == null) return error.FontNotFound;
var font_data = maybe_font_data.?;
for (data, 0..) |line, starting_display_line| {
var utf8 = (try std.unicode.Utf8View.init(line.*)).iterator();
const starting_display_row = display.HEIGHT / display.LINES * starting_display_line;
var starting_display_column: usize = 0;
while (utf8.nextCodepoint()) |cp| {
var glyph: [display.FONT_WIDTH * display.FONT_HEIGHT]u8 = undefined;
std.debug.assert(font_data.get(cp).?.*.len == (display.FONT_WIDTH * display.FONT_HEIGHT / 8));
// Is .? appropriate here? this is a hard fail if our codepoint isn't in the font...
for (font_data.get(cp).?.*, 0..) |b, i| {
glyph[i] = b;
}
unpackBits(&glyph); // this will fill the rest of our array
// std.log.debug("====" ++ "=" ** display.FONT_WIDTH, .{});
// for (0..display.FONT_HEIGHT) |i| {
// std.log.debug(
// "{d:0>2}: {s}",
// .{ i, fmtSliceGreyscaleImage(glyph[(i * display.FONT_WIDTH)..((i + 1) * display.FONT_WIDTH)]) },
// );
// }
// std.log.debug("====" ++ "=" ** display.FONT_WIDTH ++ "\n", .{});
// unpacked - time to ram this in
for (glyph, 0..) |b, i| {
const column = i % display.FONT_WIDTH + starting_display_column + display.BORDER_LEFT;
const row = i / display.FONT_WIDTH + starting_display_row;
pixels[(row * display.WIDTH) + column] = b;
}
starting_display_column += display.FONT_WIDTH;
}
}
}
fn getFontData(allocator: std.mem.Allocator, font_name: []const u8) !?FontInnerHash {
if (font_arena == null) {
font_arena = std.heap.ArenaAllocator.init(allocator);
}
var alloc = font_arena.?.allocator();
// The bit lookup will be a bit tricky because we have runtime value to look up
// We can use an inline for but compute complexity is a bit crazy. Best to use a
// hashmap here
//
// We aren't generating Unicode at the moment, but to handle it appropriately, let's
// assign our key value to u21
if (font_map == null) {
font_map = std.hash_map.StringHashMap(?*FontInnerHash).init(alloc);
try font_map.?.ensureTotalCapacity(supported_fonts.len);
inline for (supported_fonts) |font| {
font_map.?.putAssumeCapacity(font.name, null);
}
// defer font_map.deinit();
}
if (!font_map.?.contains(font_name)) return null; // this font not in fonts/fonts.zig. This must be addressed in compilation
const font = font_map.?.get(font_name).?;
if (font) |f| return f.*; // Font exists and is fully populated
// Font exists, but has not been populated yet. Build it now
// idk if actual map needs to be on the heap here?
// I think it does... let's try without and see how we leak
inline for (supported_fonts) |supported_font| {
if (std.mem.eql(u8, supported_font.name, font_name)) {
font_map.?.putAssumeCapacity(supported_font.name, try getFontMap(alloc, supported_font.name));
}
}
std.log.debug(
"All fonts added. Outer hash map capacity: {d} count: {d}\n",
.{ font_map.?.capacity(), font_map.?.count() },
);
std.log.debug(
"Inner hash map capacity for default font: {d} count: {d}\n",
.{ font_map.?.get(DEFAULT_FONT).?.?.capacity(), font_map.?.get(DEFAULT_FONT).?.?.count() },
);
return font_map.?.get(font_name).?.?.*;
}
/// gets a font map. All memory owned by caller
/// The inner hash map is key type u21, value type of pointer to u8 array
/// The values are used directly, but all keys will be allocated at the time
/// of call
fn getFontMap(allocator: std.mem.Allocator, comptime font_name: []const u8) !*FontInnerHash {
// supported_font is a comptime value due to inline for
// font_name is a runtime value
const font_struct = @field(fonts, font_name);
const code_points = @typeInfo(@TypeOf(font_struct)).Struct.fields;
// found font - populate map and return
var map = FontInnerHash.init(allocator);
try map.ensureTotalCapacity(code_points.len);
inline for (code_points) |point| {
if (std.mem.eql(u8, "120", point.name)) {
std.log.debug(
"CodePoint 120 Added. Data:{s}\n",
.{fmtSliceHexLower(@field(font_struct, point.name))},
);
}
var key_ptr = try allocator.create(u21);
key_ptr.* = std.fmt.parseInt(u21, point.name, 10) catch unreachable;
map.putAssumeCapacity(
key_ptr.*,
@field(font_struct, point.name),
);
}
std.log.debug(
"All codepoints added. {*} capacity: {d} count: {d}\n",
.{ &map, map.capacity(), map.count() },
);
return &map;
}
fn sendPixels(pixels: []const u8, file: [:0]const u8, device_id: u8) !void { fn sendPixels(pixels: []const u8, file: [:0]const u8, device_id: u8) !void {
if (std.mem.eql(u8, file, "-")) if (std.mem.eql(u8, file, "-"))
return sendPixelsToStdOut(pixels); return sendPixelsToStdOut(pixels);
@ -292,16 +162,13 @@ fn sendPixelsToStdOut(pixels: []const u8) !void {
var bw = std.io.bufferedWriter(stdout_file); var bw = std.io.bufferedWriter(stdout_file);
const stdout = bw.writer(); const stdout = bw.writer();
defer bw.flush() catch unreachable; // don't forget to flush! defer bw.flush() catch unreachable; // don't forget to flush!
for (0..display.HEIGHT) |i| { for (0..HEIGHT) |i| {
try stdout.print( try stdout.print("{d:0>2}: {s}\n", .{ i, fmtSliceGreyscaleImage(pixels[(i * WIDTH)..((i + 1) * WIDTH)]) });
"{d:0>2}: {s}\n",
.{ i, fmtSliceGreyscaleImage(pixels[(i * display.WIDTH)..((i + 1) * display.WIDTH)]) },
);
} }
} }
fn sendPixelsThroughI2CDriver(pixels: []const u8, file: [*:0]const u8, device_id: u8) !void { fn sendPixelsThroughI2CDriver(pixels: []const u8, file: [*:0]const u8, device_id: u8) !void {
var pixels_write_command = [_]u8{0x00} ** ((display.WIDTH * display.PAGES) + 1); var pixels_write_command = [_]u8{0x00} ** ((WIDTH * PAGES) + 1);
pixels_write_command[0] = 0x40; pixels_write_command[0] = 0x40;
packPixelsToDeviceFormat(pixels, pixels_write_command[1..]); packPixelsToDeviceFormat(pixels, pixels_write_command[1..]);
var i2c = c.I2CDriver{ var i2c = c.I2CDriver{
@ -361,8 +228,8 @@ fn sendPixelsThroughI2CDriver(pixels: []const u8, file: [*:0]const u8, device_id
fn packPixelsToDeviceFormat(pixels: []const u8, packed_pixels: []u8) void { fn packPixelsToDeviceFormat(pixels: []const u8, packed_pixels: []u8) void {
// Each u8 in pixels is a single bit. We need to pack these bits // Each u8 in pixels is a single bit. We need to pack these bits
for (packed_pixels, 0..) |*b, i| { for (packed_pixels, 0..) |*b, i| {
const column = i % display.WIDTH; const column = i % WIDTH;
const page = i / display.WIDTH; const page = i / WIDTH;
// if (column == 0) std.debug.print("{d}: ", .{page}); // if (column == 0) std.debug.print("{d}: ", .{page});
// pixel array will be 8x as "high" as the data array we are sending to // pixel array will be 8x as "high" as the data array we are sending to
@ -371,7 +238,7 @@ fn packPixelsToDeviceFormat(pixels: []const u8, packed_pixels: []u8) void {
// //
// To convert from the pixel array above, we need to: // To convert from the pixel array above, we need to:
// 1. convert from device page to a base "row" in the pixel array // 1. convert from device page to a base "row" in the pixel array
const row = page * display.PAGES; const row = page * PAGES;
// 2. We will have 8 rows for each base row // 2. We will have 8 rows for each base row
// 3. Multiple each row by the width to get the index of the start of // 3. Multiple each row by the width to get the index of the start of
// the row // the row
@ -386,14 +253,14 @@ fn packPixelsToDeviceFormat(pixels: []const u8, packed_pixels: []u8) void {
// per source byte // per source byte
// 2. Shift that bit into the proper position in our destination byte // 2. Shift that bit into the proper position in our destination byte
b.* = (pixels[(0 + row) * display.WIDTH + column] & 0x01) << 0 | b.* = (pixels[(0 + row) * WIDTH + column] & 0x01) << 0 |
(pixels[(1 + row) * display.WIDTH + column] & 0x01) << 1 | (pixels[(1 + row) * WIDTH + column] & 0x01) << 1 |
(pixels[(2 + row) * display.WIDTH + column] & 0x01) << 2 | (pixels[(2 + row) * WIDTH + column] & 0x01) << 2 |
(pixels[(3 + row) * display.WIDTH + column] & 0x01) << 3 | (pixels[(3 + row) * WIDTH + column] & 0x01) << 3 |
(pixels[(4 + row) * display.WIDTH + column] & 0x01) << 4 | (pixels[(4 + row) * WIDTH + column] & 0x01) << 4 |
(pixels[(5 + row) * display.WIDTH + column] & 0x01) << 5 | (pixels[(5 + row) * WIDTH + column] & 0x01) << 5 |
(pixels[(6 + row) * display.WIDTH + column] & 0x01) << 6 | (pixels[(6 + row) * WIDTH + column] & 0x01) << 6 |
(pixels[(7 + row) * display.WIDTH + column] & 0x01) << 7; (pixels[(7 + row) * WIDTH + column] & 0x01) << 7;
// std.debug.print("{s}", .{std.fmt.fmtSliceHexLower(&[_]u8{b.*})}); // std.debug.print("{s}", .{std.fmt.fmtSliceHexLower(&[_]u8{b.*})});
// if (column == 127) std.debug.print("\n", .{}); // if (column == 127) std.debug.print("\n", .{});
@ -409,35 +276,6 @@ fn i2cWrite(i2c: *c.I2CDriver, bytes: []const u8) !void {
return error.BadWrite; return error.BadWrite;
} }
const Case = enum { lower, upper };
fn formatSliceHexImpl(comptime case: Case) type {
const charset = "0123456789" ++ if (case == .upper) "ABCDEF" else "abcdef";
return struct {
pub fn formatSliceHexImpl(
bytes: []const u8,
comptime fmt: []const u8,
options: std.fmt.FormatOptions,
writer: anytype,
) !void {
_ = fmt;
_ = options;
var buf: [2]u8 = undefined;
for (bytes) |ch| {
buf[0] = charset[ch >> 4];
buf[1] = charset[ch & 15];
try writer.print(" 0x", .{});
try writer.writeAll(&buf);
}
}
};
}
const formatSliceHexLower = formatSliceHexImpl(.lower).formatSliceHexImpl;
fn fmtSliceHexLower(bytes: []const u8) std.fmt.Formatter(formatSliceHexLower) {
return .{ .data = bytes };
}
fn fmtSliceGreyscaleImage(bytes: []const u8) std.fmt.Formatter(formatSliceGreyscaleImage) { fn fmtSliceGreyscaleImage(bytes: []const u8) std.fmt.Formatter(formatSliceGreyscaleImage) {
return .{ .data = bytes }; return .{ .data = bytes };
} }
@ -467,10 +305,7 @@ fn reportMagickError(mw: ?*c.MagickWand) !void {
fn textForLine(line: usize) []u8 { fn textForLine(line: usize) []u8 {
return lines[line].*; return lines[line].*;
} }
fn noTextForLine(_: usize) []u8 { fn convertImage(filename: [:0]u8, pixels: *[WIDTH * HEIGHT]u8, text_fn: *const fn (usize) []u8) !void {
return "";
}
fn convertImage(filename: [:0]u8, pixels: *[display.WIDTH * display.HEIGHT]u8, text_fn: *const fn (usize) []u8) !void {
c.MagickWandGenesis(); c.MagickWandGenesis();
defer c.MagickWandTerminus(); defer c.MagickWandTerminus();
var mw = c.NewMagickWand(); var mw = c.NewMagickWand();
@ -508,7 +343,7 @@ fn convertImage(filename: [:0]u8, pixels: *[display.WIDTH * display.HEIGHT]u8, t
// This should be 48x64 with our test // This should be 48x64 with our test
// Command line resize works differently than this. Here we need to find // Command line resize works differently than this. Here we need to find
// new width and height based on the input aspect ratio ourselves // new width and height based on the input aspect ratio ourselves
const resize_dimensions = getNewDimensions(w, h, display.WIDTH, display.HEIGHT); const resize_dimensions = getNewDimensions(w, h, WIDTH, HEIGHT);
std.log.debug("Dimensions for resize: {d}x{d}\n", .{ resize_dimensions.width, resize_dimensions.height }); std.log.debug("Dimensions for resize: {d}x{d}\n", .{ resize_dimensions.width, resize_dimensions.height });
@ -534,21 +369,21 @@ fn convertImage(filename: [:0]u8, pixels: *[display.WIDTH * display.HEIGHT]u8, t
// around it means that the offset will be negative // around it means that the offset will be negative
status = c.MagickExtentImage( status = c.MagickExtentImage(
mw, mw,
display.WIDTH, WIDTH,
display.HEIGHT, HEIGHT,
-@intCast(isize, (display.WIDTH - resize_dimensions.width) / 2), -@intCast(isize, (WIDTH - resize_dimensions.width) / 2),
-@intCast(isize, (display.HEIGHT - resize_dimensions.height) / 2), -@intCast(isize, (HEIGHT - resize_dimensions.height) / 2),
); );
if (status == c.MagickFalse) if (status == c.MagickFalse)
return error.CouldNotSetExtent; return error.CouldNotSetExtent;
for (0..display.LINES) |i| { for (0..LINES) |i| {
const text = text_fn(i); const text = text_fn(i);
if (text.len == 0) continue; if (text.len == 0) continue;
// We have text! // We have text!
const y: isize = display.FONT_HEIGHT * @intCast(isize, i); const y: isize = FONT_HEIGHT * @intCast(isize, i);
var x: isize = display.BORDER_LEFT; var x: isize = BORDER_LEFT;
var left_spaces: isize = 0; var left_spaces: isize = 0;
for (text) |ch| { for (text) |ch| {
if (ch == ' ') { if (ch == ' ') {
@ -557,7 +392,7 @@ fn convertImage(filename: [:0]u8, pixels: *[display.WIDTH * display.HEIGHT]u8, t
} }
break; break;
} }
x += (display.FONT_WIDTH * left_spaces); x += (FONT_WIDTH * left_spaces);
mw = try drawString(mw, text[@intCast(usize, left_spaces)..], x, y); mw = try drawString(mw, text[@intCast(usize, left_spaces)..], x, y);
} }
@ -580,12 +415,12 @@ fn convertImage(filename: [:0]u8, pixels: *[display.WIDTH * display.HEIGHT]u8, t
if (status == c.MagickFalse) if (status == c.MagickFalse)
return error.CouldNotQuantizeImage; return error.CouldNotQuantizeImage;
status = c.MagickExportImagePixels(mw, 0, 0, display.WIDTH, display.HEIGHT, "I", c.CharPixel, @ptrCast(*anyopaque, pixels)); status = c.MagickExportImagePixels(mw, 0, 0, WIDTH, HEIGHT, "I", c.CharPixel, @ptrCast(*anyopaque, pixels));
if (status == c.MagickFalse) if (status == c.MagickFalse)
return error.CouldNotExportImage; return error.CouldNotExportImage;
for (0..display.WIDTH * display.HEIGHT) |i| { for (0..WIDTH * HEIGHT) |i| {
switch (pixels[i]) { switch (pixels[i]) {
0x00 => pixels[i] = 0xFF, 0x00 => pixels[i] = 0xFF,
0xFF => pixels[i] = 0x00, 0xFF => pixels[i] = 0x00,
@ -599,7 +434,7 @@ fn drawString(mw: ?*c.MagickWand, str: []const u8, x: isize, y: isize) !?*c.Magi
rc = try drawCharacter( rc = try drawCharacter(
rc, rc,
ch, ch,
-(x + @intCast(isize, display.FONT_WIDTH * i)), -(x + @intCast(isize, FONT_WIDTH * i)),
-y, -y,
); );
} }
@ -641,8 +476,8 @@ fn drawCharacter(mw: ?*c.MagickWand, char: u8, x: isize, y: isize) !?*c.MagickWa
// I think our characters are offset by 6px in the x and 8 in the y // I think our characters are offset by 6px in the x and 8 in the y
status = c.MagickExtentImage( status = c.MagickExtentImage(
cw, cw,
display.WIDTH, WIDTH,
display.HEIGHT, HEIGHT,
x, x,
y, y,
); );
@ -681,71 +516,22 @@ fn getNewDimensions(width: usize, height: usize, desired_width: usize, desired_h
.height = @floatToInt(usize, @intToFloat(f64, height) / resize_ratio), // 64, .height = @floatToInt(usize, @intToFloat(f64, height) / resize_ratio), // 64,
}; };
} }
test "gets proper font data" {
// std.testing.log_level = .debug;
std.log.debug("\n", .{});
defer deinit();
var maybe_font_data = try getFontData(std.testing.allocator, DEFAULT_FONT);
try std.testing.expect(maybe_font_data != null);
var font_data = maybe_font_data.?;
try std.testing.expect(font_data.capacity() > 90);
try std.testing.expect(font_data.count() > 0);
try std.testing.expect(font_data.get(33) != null);
try std.testing.expectEqualSlices(u8, &[_]u8{ 0x80, 0x10, 0x42, 0x00, 0x20 }, font_data.get(33).?);
}
test "deinit" {
defer deinit();
}
test "gets correct bytes" { test "gets correct bytes" {
defer deinit();
std.testing.log_level = .debug;
std.log.debug("\n", .{});
const bg_file: [:0]u8 = @constCast("logo:"); const bg_file: [:0]u8 = @constCast("logo:");
const opts = .{ .background_filename = bg_file, .device_file = "-" }; const opts = .{ .background_filename = bg_file, .device_file = "-" };
var empty: [:0]u8 = @constCast(""); const empty: [:0]u8 = @constCast("");
for (&lines) |*line| { for (&lines) |*line| {
line.* = &empty; line.* = &empty;
} }
var line: [:0]u8 = @constCast("Hello\\!"); const line: [:0]u8 = @constCast("Hello\\!");
lines[5] = &line; lines[5] = &line;
var pixels: [display.WIDTH * display.HEIGHT]u8 = undefined; var pixels: [WIDTH * HEIGHT]u8 = undefined;
var expected_pixels: *const [display.WIDTH * display.HEIGHT]u8 = @embedFile("testExpectedBytes.bin"); var expected_pixels: *const [WIDTH * HEIGHT]u8 = @embedFile("testExpectedBytes.bin");
// [_]u8{..,..,..} // [_]u8{..,..,..}
try convertImage(opts.background_filename, &pixels, noTextForLine); try convertImage(opts.background_filename, &pixels, textForLine);
try addTextToImage(std.testing.allocator, &pixels, &lines);
const fmt = "{d:0>2}: {s}";
for (0..display.HEIGHT) |i| {
const actual = try std.fmt.allocPrint(
std.testing.allocator,
fmt,
.{ i, fmtSliceGreyscaleImage(pixels[(i * display.WIDTH)..((i + 1) * display.WIDTH)]) },
);
defer std.testing.allocator.free(actual);
const expected = try std.fmt.allocPrint(
std.testing.allocator,
fmt,
.{ i, fmtSliceGreyscaleImage(expected_pixels[(i * display.WIDTH)..((i + 1) * display.WIDTH)]) },
);
defer std.testing.allocator.free(expected);
std.testing.expectEqualSlices(u8, expected, actual) catch |err| {
for (0..display.HEIGHT) |r| {
std.log.debug(
fmt,
.{ r, fmtSliceGreyscaleImage(pixels[(r * display.WIDTH)..((r + 1) * display.WIDTH)]) },
);
}
for (0..display.HEIGHT) |r| {
std.log.debug(
fmt,
.{ r, fmtSliceGreyscaleImage(expected_pixels[(r * display.WIDTH)..((r + 1) * display.WIDTH)]) },
);
}
return err;
};
}
// try writeBytesToFile("testExpectedBytes.bin", &pixels); // try writeBytesToFile("testExpectedBytes.bin", &pixels);
try std.testing.expectEqualSlices(u8, expected_pixels, &pixels); try std.testing.expectEqualSlices(u8, expected_pixels, &pixels);
} }
@ -763,3 +549,9 @@ fn writeBytesToFile(filename: []const u8, bytes: []u8) !void {
try writer.writeAll(bytes); try writer.writeAll(bytes);
// try writer.print("pub const chars = &[_][]const u8{{\n", .{}); // try writer.print("pub const chars = &[_][]const u8{{\n", .{});
} }
test "simple test" {
var list = std.ArrayList(i32).init(std.testing.allocator);
defer list.deinit(); // try commenting this out and see if zig detects the memory leak!
try list.append(42);
try std.testing.expectEqual(@as(i32, 42), list.pop());
}

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src/testExpectedBytes.bin
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