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calculate cell widt/height, cross verified with kitty

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This commit is contained in:
Mitchell Hashimoto
2022-04-06 13:05:53 -07:00
parent 811b5f37f2
commit 936b987871
3 changed files with 31 additions and 4 deletions
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BIN
fonts/FiraCode-Regular.ttf Executable file
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2
src/FontAtlas.zig
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@ -177,7 +177,7 @@ pub fn addGlyph(self: *FontAtlas, alloc: Allocator, v: anytype) !*Glyph {
.advance_x = f26dot6ToFloat(glyph.*.advance.x),
};
log.debug("loaded glyph codepoint={} glyph={}", .{ utf32, gop.value_ptr.* });
//log.debug("loaded glyph codepoint={} glyph={}", .{ utf32, gop.value_ptr.* });
return gop.value_ptr;
}

33
src/TextRenderer.zig
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@ -1,12 +1,15 @@
const TextRenderer = @This();
const std = @import("std");
const assert = std.debug.assert;
const ftc = @import("freetype/c.zig");
const gl = @import("opengl.zig");
const gb = @import("gb_math.zig");
const Atlas = @import("Atlas.zig");
const FontAtlas = @import("FontAtlas.zig");
const log = std.log.scoped(.text_renderer);
alloc: std.mem.Allocator,
projection: gb.gbMat4 = undefined,
@ -29,14 +32,37 @@ pub fn init(alloc: std.mem.Allocator) !TextRenderer {
errdefer atlas.deinit(alloc);
var font = try FontAtlas.init(atlas);
errdefer font.deinit(alloc);
try font.loadFaceFromMemory(face_ttf, 48);
try font.loadFaceFromMemory(face_ttf, 30);
// We'll calculate the cell width as the widest glyph advance
// in the set of visible ASCII characters.
var cell_width: f32 = 0;
// Load all visible ASCII characters.
var i: u8 = 32;
while (i <= 126) : (i += 1) {
_ = try font.addGlyph(alloc, i);
const glyph = try font.addGlyph(alloc, i);
if (glyph.advance_x > cell_width) {
cell_width = @ceil(glyph.advance_x);
}
}
// The cell height is the vertical height required to render underscore
// '_' which should live at the bottom of a cell.
const cell_height: f32 = cell_height: {
// TODO(render): kitty does a calculation based on other font
// metrics that we probably want to research more. For now, this is
// fine.
assert(font.ft_face != null);
const glyph = font.getGlyph('_').?;
var res: i32 = font.ft_face.*.ascender >> 6;
res -= glyph.offset_y;
res += @intCast(i32, glyph.height);
break :cell_height @intToFloat(f32, res);
};
log.debug("cell size w={d} h={d}", .{ cell_width, cell_height });
// Build our texture
const tex = try gl.Texture.create();
errdefer tex.destroy();
@ -189,4 +215,5 @@ pub fn render(
try gl.VertexArray.unbind();
}
const face_ttf = @embedFile("../fonts/Inconsolata-Regular.ttf");
const face_ttf = @embedFile("../fonts/FiraCode-Regular.ttf");
//const face_ttf = @embedFile("../fonts/Inconsolata-Regular.ttf");