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const std = @import("std");
pub const Backend = enum {
const WasmTarget = @import("../os/wasm/target.zig").Target;
/// FreeType for font rendering with no font discovery enabled.
freetype,
/// FreeType for font rendering with a built-in Windows font directory
/// scanner (C:\Windows\Fonts + %LOCALAPPDATA%\Microsoft\Windows\Fonts).
/// Used when DirectWrite is not available; matches by family_name and
/// SFNT name table without any external index.
freetype_windows,
/// Fontconfig for font discovery and FreeType for font rendering.
fontconfig_freetype,
/// CoreText for font discovery, rendering, and shaping (macOS).
coretext,
/// CoreText for font discovery, FreeType for rendering, and
/// HarfBuzz for shaping (macOS).
coretext_freetype,
/// CoreText for font discovery and rendering, HarfBuzz for shaping
coretext_harfbuzz,
/// CoreText for font discovery and rendering, no shaping.
coretext_noshape,
/// Use the browser font system and the Canvas API (wasm). This limits
/// the available fonts to browser fonts (anything Canvas natively
/// supports).
web_canvas,
/// Returns the default backend for a build environment. This is
/// meant to be called at comptime by the build.zig script. To get the
/// backend look at build_options.
pub fn default(
target: std.Target,
wasm_target: WasmTarget,
) Backend {
if (target.cpu.arch == .wasm32) {
return switch (wasm_target) {
.browser => .web_canvas,
};
}
if (target.os.tag == .windows) {
// Avoid fontconfig on Windows because its libxml2 dependency
// may not unpack due to symlinks. Use the FreeType-based
// Windows font-directory scanner for discovery. A future
// DirectWrite backend can replace this if needed.
return .freetype_windows;
}
// macOS also supports "coretext_freetype" but there is no scenario
// that is the default. It is only used by people who want to
// self-compile Ghostty and prefer the freetype aesthetic.
return if (target.os.tag.isDarwin()) .coretext else .fontconfig_freetype;
}
// All the functions below can be called at comptime or runtime to
// determine if we have a certain dependency.
pub fn hasFreetype(self: Backend) bool {
return switch (self) {
.freetype,
.freetype_windows,
.fontconfig_freetype,
.coretext_freetype,
=> true,
.coretext,
.coretext_harfbuzz,
.coretext_noshape,
.web_canvas,
=> false,
};
}
pub fn hasCoretext(self: Backend) bool {
return switch (self) {
.coretext,
.coretext_freetype,
.coretext_harfbuzz,
.coretext_noshape,
=> true,
.freetype,
.freetype_windows,
.fontconfig_freetype,
.web_canvas,
=> false,
};
}
pub fn hasFontconfig(self: Backend) bool {
return switch (self) {
.fontconfig_freetype => true,
.freetype,
.freetype_windows,
.coretext,
.coretext_freetype,
.coretext_harfbuzz,
.coretext_noshape,
.web_canvas,
=> false,
};
}
pub fn hasHarfbuzz(self: Backend) bool {
return switch (self) {
.freetype,
.freetype_windows,
.fontconfig_freetype,
.coretext_freetype,
.coretext_harfbuzz,
=> true,
.coretext,
.coretext_noshape,
.web_canvas,
=> false,
};
}
};
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