freetype: ~99% Core-API Coverage

- breaking structure changes
- optimazed examples
- more tests

freetype/examples/single-glyph.zig

@@ -1,52 +1,27 @@
+// zig build run-example-single-glyph -- B
 const std = @import("std");
 const freetype = @import("freetype");
 
-const WIDTH = 32;
-const HEIGHT = 24;
-
-fn drawBitmap(bitmap: freetype.Bitmap, x: usize, y: usize) [HEIGHT][WIDTH]u8 {
-    var figure = std.mem.zeroes([HEIGHT][WIDTH]u8);
-    var p: usize = 0;
-    var q: usize = 0;
-    const w = bitmap.width();
-    const x_max = x + w;
-    const y_max = y + bitmap.rows();
-    var i: usize = 0;
-    while (i < x_max - x) : (i += 1) {
-        var j: usize = 0;
-        while (j < y_max - y) : (j += 1) {
-            if (i < WIDTH and j < HEIGHT) {
-                figure[j][i] |= bitmap.buffer()[q * w + p];
-                q += 1;
-            }
-        }
-        q = 0;
-        p += 1;
-    }
-    return figure;
-}
-
 pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
+    var args = try std.process.argsAlloc(allocator);
+    defer std.process.argsFree(allocator, args);
+
     const lib = try freetype.Library.init();
     defer lib.deinit();
 
     const face = try lib.newFace("upstream/assets/FiraSans-Regular.ttf", 0);
-    defer face.deinit();
-
-    try face.setCharSize(40 * 64, 0, 50, 0);
-    try face.loadChar('@', .{ .render = true });
-
-    const glyph = face.glyph;
-    const x = @intCast(usize, glyph.bitmapLeft());
-    const y = HEIGHT - @intCast(usize, glyph.bitmapTop());
-
-    var figure = drawBitmap(glyph.bitmap(), x, y);
+    try face.setCharSize(60 * 48, 0, 50, 0);
+    try face.loadChar(args[1][0], .{ .render = true });
+    const bitmap = face.glyph().bitmap();
 
     var i: usize = 0;
-    while (i < HEIGHT) : (i += 1) {
+    while (i < bitmap.rows()) : (i += 1) {
         var j: usize = 0;
-        while (j < WIDTH) : (j += 1) {
-            const char: u8 = switch (figure[i][j]) {
+        while (j < bitmap.width()) : (j += 1) {
+            const char: u8 = switch (bitmap.buffer()[i * bitmap.width() + j]) {
                 0 => ' ',
                 1...128 => ';',
                 else => '#',