64 lines
2.0 KiB
Zig
64 lines
2.0 KiB
Zig
const builtin = @import("builtin");
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const options = @import("main.zig").options;
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const freetype = @import("face/freetype.zig");
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const coretext = @import("face/coretext.zig");
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const web_canvas = @import("face/web_canvas.zig");
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/// Face implementation for the compile options.
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pub const Face = switch (options.backend) {
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.fontconfig_freetype => freetype.Face,
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.coretext => freetype.Face,
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//.coretext => coretext.Face,
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.web_canvas => web_canvas.Face,
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else => unreachable,
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};
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/// If a DPI can't be calculated, this DPI is used. This is probably
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/// wrong on modern devices so it is highly recommended you get the DPI
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/// using whatever platform method you can.
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pub const default_dpi = if (builtin.os.tag == .macos) 72 else 96;
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/// The desired size for loading a font.
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pub const DesiredSize = struct {
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// Desired size in points
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points: u16,
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// The DPI of the screen so we can convert points to pixels.
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xdpi: u16 = default_dpi,
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ydpi: u16 = default_dpi,
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// Converts points to pixels
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pub fn pixels(self: DesiredSize) u16 {
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// 1 point = 1/72 inch
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return (self.points * self.ydpi) / 72;
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}
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};
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/// Metrics associated with the font that are useful for renderers to know.
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pub const Metrics = struct {
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/// Recommended cell width and height for a monospace grid using this font.
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cell_width: f32,
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cell_height: f32,
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/// For monospace grids, the recommended y-value from the bottom to set
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/// the baseline for font rendering. This is chosen so that things such
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/// as the bottom of a "g" or "y" do not drop below the cell.
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cell_baseline: f32,
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/// The position of the underline from the top of the cell and the
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/// thickness in pixels.
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underline_position: f32,
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underline_thickness: f32,
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/// The position and thickness of a strikethrough. Same units/style
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/// as the underline fields.
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strikethrough_position: f32,
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strikethrough_thickness: f32,
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};
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pub const Foo = if (options.backend == .coretext) coretext.Face else void;
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test {
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@import("std").testing.refAllDecls(@This());
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}
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