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Emoji and Wide Unicode Char Support (i.e. Asian characters)

Browse Source 
Many changes to support emoji and wide chars:

- Freetype built with libpng support (some emoji font use pngs)
- Introduced `font.FallbackSet` structure for looking for glyphs in multiple fonts so we can find emojis
- Texture atlas supports 3 and 4 channel colors (RGB/RGBA, although emojis are in BGRA)
- `font.Face` supports loading colored fonts and glyphs
- `font.Face` supports fonts that do not support variable pixel sizes
- Shader supports two textures (greyscale and colored)
- Shader will downsample glyphs that don't fit into the cell size because some fixed size emoji fonts are large
- Shader supports wide (2x) cells across all types: cursor, fg, bg, underline
- Terminal state supports detecting and managing wide (2x) chars by looking them up in the Unicode EastAsianWidth database and populating "spacer" cells.
- Selection (and clipboard ops) support wide chars
This commit is contained in:
Mitchell Hashimoto
2022-08-20 17:33:59 -07:00
committed by GitHub
parent 5ae450099d ec288d9111
commit 235146ccd4
22 changed files with 903 additions and 169 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
.github/workflows/test.yml vendored
View File

@ -35,10 +35,10 @@ jobs:
with:
nix_path: nixpkgs=channel:nixos-unstable
# Run our go tests within the context of the dev shell from the flake. This
# will ensure we have all our dependencies.
# Cross-compile the binary. We always use static building for this
# because its the only way to access the headers.
- name: Test Build
run: nix develop -c zig build -Dtarget=${{ matrix.target }}
run: nix develop -c zig build -Dstatic=true -Dtarget=${{ matrix.target }}
test:
strategy:
@ -57,7 +57,9 @@ jobs:
with:
nix_path: nixpkgs=channel:nixos-unstable
# Run our go tests within the context of the dev shell from the flake. This
# will ensure we have all our dependencies.
- name: test
run: nix develop -c zig build test
- name: Test Dynamic Build
run: nix develop -c zig build -Dstatic=false

3
.gitmodules vendored
View File

@ -19,3 +19,6 @@
[submodule "vendor/libpng"]
path = vendor/libpng
url = https://github.com/glennrp/libpng.git
[submodule "vendor/utf8proc"]
path = vendor/utf8proc
url = https://github.com/JuliaStrings/utf8proc.git

71
build.zig
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@ -6,11 +6,12 @@ const glfw = @import("vendor/mach/glfw/build.zig");
const freetype = @import("pkg/freetype/build.zig");
const libuv = @import("pkg/libuv/build.zig");
const libpng = @import("pkg/libpng/build.zig");
const utf8proc = @import("pkg/utf8proc/build.zig");
const zlib = @import("pkg/zlib/build.zig");
const tracylib = @import("pkg/tracy/build.zig");
const system_sdk = @import("vendor/mach/glfw/system_sdk.zig");
/// A build that is set to true if Tracy integration should be built.
// Build options, see the build options help for more info.
var tracy: bool = false;
pub fn build(b: *std.build.Builder) !void {
@ -32,6 +33,12 @@ pub fn build(b: *std.build.Builder) !void {
"Enable Tracy integration (default true in Debug on Linux)",
) orelse (mode == .Debug and target.isLinux());
const static = b.option(
bool,
"static",
"Statically build as much as possible for the exe",
) orelse true;
const conformance = b.option(
[]const u8,
"conformance",
@ -51,7 +58,7 @@ pub fn build(b: *std.build.Builder) !void {
exe.install();
// Add the shared dependencies
try addDeps(b, exe);
try addDeps(b, exe, static);
}
// term.wasm
@ -64,7 +71,11 @@ pub fn build(b: *std.build.Builder) !void {
wasm.setTarget(.{ .cpu_arch = .wasm32, .os_tag = .freestanding });
wasm.setBuildMode(mode);
wasm.setOutputDir("zig-out");
// Wasm-specific deps
wasm.addPackage(tracylib.pkg);
wasm.addPackage(utf8proc.pkg);
_ = try utf8proc.link(b, wasm);
const step = b.step("term-wasm", "Build the terminal.wasm library");
step.dependOn(&wasm.step);
@ -104,7 +115,7 @@ pub fn build(b: *std.build.Builder) !void {
}
main_test.setTarget(target);
try addDeps(b, main_test);
try addDeps(b, main_test, true);
var before = b.addLog("\x1b[" ++ color_map.get("cyan").? ++ "\x1b[" ++ color_map.get("b").? ++ "[{s} tests]" ++ "\x1b[" ++ color_map.get("d").? ++ " ----" ++ "\x1b[0m", .{"ghostty"});
var after = b.addLog("\x1b[" ++ color_map.get("d").? ++ "–––---\n\n" ++ "\x1b[0m", .{});
@ -122,7 +133,7 @@ pub fn build(b: *std.build.Builder) !void {
var test_ = b.addTestSource(pkg.source);
test_.setTarget(target);
try addDeps(b, test_);
try addDeps(b, test_, true);
if (pkg.dependencies) |children| {
test_.packages = std.ArrayList(std.build.Pkg).init(b.allocator);
try test_.packages.appendSlice(children);
@ -141,11 +152,46 @@ pub fn build(b: *std.build.Builder) !void {
fn addDeps(
b: *std.build.Builder,
step: *std.build.LibExeObjStep,
static: bool,
) !void {
// We always need the Zig packages
step.addPackage(freetype.pkg);
step.addPackage(glfw.pkg);
step.addPackage(libuv.pkg);
step.addPackage(utf8proc.pkg);
// We always statically compile glad
step.addIncludeDir("vendor/glad/include/");
step.addCSourceFile("vendor/glad/src/gl.c", &.{});
// Dependencies of other dependencies
// Tracy
step.addPackage(tracylib.pkg);
if (tracy) {
var tracy_step = try tracylib.link(b, step);
system_sdk.include(b, tracy_step, .{});
}
// utf8proc
_ = try utf8proc.link(b, step);
// Glfw
glfw.link(b, step, .{
.metal = false,
.opengl = false, // Found at runtime
});
// Dynamic link
if (!static) {
step.addIncludePath(freetype.include_path_self);
step.linkSystemLibrary("bzip2");
step.linkSystemLibrary("freetype2");
step.linkSystemLibrary("libpng");
step.linkSystemLibrary("libuv");
step.linkSystemLibrary("zlib");
}
// Other dependencies, we may dynamically link
if (static) {
const zlib_step = try zlib.link(b, step);
const libpng_step = try libpng.link(b, step, .{
.zlib = .{
@ -155,7 +201,6 @@ fn addDeps(
});
// Freetype
step.addPackage(freetype.pkg);
_ = try freetype.link(b, step, .{
.libpng = freetype.Options.Libpng{
.enabled = true,
@ -170,23 +215,9 @@ fn addDeps(
},
});
// Glfw
step.addPackage(glfw.pkg);
glfw.link(b, step, .{
.metal = false,
.opengl = false, // Found at runtime
});
// Libuv
step.addPackage(libuv.pkg);
var libuv_step = try libuv.link(b, step);
system_sdk.include(b, libuv_step, .{});
// Tracy
step.addPackage(tracylib.pkg);
if (tracy) {
var tracy_step = try tracylib.link(b, step);
system_sdk.include(b, tracy_step, .{});
}
}

14
nix/devshell.nix
View File

@ -19,18 +19,26 @@
, freetype
, libpng
, libGL
, libuv
, libX11
, libXcursor
, libXext
, libXi
, libXinerama
, libXrandr
, zlib
}:
let
# See package.nix. Keep in sync.
rpathLibs = [
libGL
] ++ lib.optionals stdenv.isLinux [
bzip2
freetype
libpng
libuv
zlib
libX11
libXcursor
libXi
@ -61,6 +69,12 @@ in mkShell rec {
buildInputs = [
# TODO: non-linux
] ++ lib.optionals stdenv.isLinux [
bzip2
freetype
libpng
libuv
zlib
libX11
libXcursor
libXext

2
pkg/freetype/build.zig
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@ -3,7 +3,7 @@ const std = @import("std");
/// Directories with our includes.
const root = thisDir() ++ "../../../vendor/freetype/";
const include_path = root ++ "include";
const include_path_self = thisDir();
pub const include_path_self = thisDir();
pub const pkg = std.build.Pkg{
.name = "freetype",

51
pkg/utf8proc/build.zig Normal file
View File

@ -0,0 +1,51 @@
const std = @import("std");
/// Directories with our includes.
const root = thisDir() ++ "../../../vendor/utf8proc/";
const include_path = root;
pub const include_paths = .{include_path};
pub const pkg = std.build.Pkg{
.name = "utf8proc",
.source = .{ .path = thisDir() ++ "/main.zig" },
};
fn thisDir() []const u8 {
return std.fs.path.dirname(@src().file) orelse ".";
}
pub fn link(b: *std.build.Builder, step: *std.build.LibExeObjStep) !*std.build.LibExeObjStep {
const lib = try buildLib(b, step);
step.linkLibrary(lib);
step.addIncludePath(include_path);
return lib;
}
pub fn buildLib(
b: *std.build.Builder,
step: *std.build.LibExeObjStep,
) !*std.build.LibExeObjStep {
const lib = b.addStaticLibrary("utf8proc", null);
lib.setTarget(step.target);
lib.setBuildMode(step.build_mode);
// Include
lib.addIncludePath(include_path);
// Link
lib.linkLibC();
// Compile
var flags = std.ArrayList([]const u8).init(b.allocator);
defer flags.deinit();
// C files
lib.addCSourceFiles(srcs, flags.items);
return lib;
}
const srcs = &.{
root ++ "utf8proc.c",
};

3
pkg/utf8proc/c.zig Normal file
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@ -0,0 +1,3 @@
pub usingnamespace @cImport({
@cInclude("utf8proc.h");
});

8
pkg/utf8proc/main.zig Normal file
View File

@ -0,0 +1,8 @@
pub const c = @import("c.zig");
/// Given a codepoint, return a character width analogous to `wcwidth(codepoint)`,
/// except that a width of 0 is returned for non-printable codepoints
/// instead of -1 as in `wcwidth`.
pub fn charwidth(codepoint: u21) u8 {
return @intCast(u8, c.utf8proc_charwidth(@intCast(i32, codepoint)));
}

11
shaders/cell.f.glsl
View File

@ -18,6 +18,7 @@ layout(location = 0) out vec4 out_FragColor;
// Font texture
uniform sampler2D text;
uniform sampler2D text_color;
// Dimensions of the cell
uniform vec2 cell_size;
@ -25,22 +26,30 @@ uniform vec2 cell_size;
// See vertex shader
const uint MODE_BG = 1u;
const uint MODE_FG = 2u;
const uint MODE_FG_COLOR = 7u;
const uint MODE_CURSOR_RECT = 3u;
const uint MODE_CURSOR_RECT_HOLLOW = 4u;
const uint MODE_CURSOR_BAR = 5u;
const uint MODE_UNDERLINE = 6u;
const uint MODE_WIDE_MASK = 128u; // 0b1000_0000
void main() {
float a;
switch (mode) {
case MODE_BG:
out_FragColor = color;
break;
case MODE_FG:
float a = texture(text, glyph_tex_coords).r;
a = texture(text, glyph_tex_coords).r;
out_FragColor = vec4(color.rgb, color.a*a);
break;
case MODE_FG_COLOR:
out_FragColor = texture(text_color, glyph_tex_coords);
break;
case MODE_CURSOR_RECT:
out_FragColor = color;
break;

58
shaders/cell.v.glsl
View File

@ -6,10 +6,12 @@
// NOTE: this must be kept in sync with the fragment shader
const uint MODE_BG = 1u;
const uint MODE_FG = 2u;
const uint MODE_FG_COLOR = 7u;
const uint MODE_CURSOR_RECT = 3u;
const uint MODE_CURSOR_RECT_HOLLOW = 4u;
const uint MODE_CURSOR_BAR = 5u;
const uint MODE_UNDERLINE = 6u;
const uint MODE_WIDE_MASK = 128u; // 0b1000_0000
// The grid coordinates (x, y) where x < columns and y < rows
layout (location = 0) in vec2 grid_coord;
@ -50,6 +52,7 @@ flat out vec2 screen_cell_pos;
flat out uint mode;
uniform sampler2D text;
uniform sampler2D text_color;
uniform vec2 cell_size;
uniform mat4 projection;
uniform float glyph_baseline;
@ -75,8 +78,12 @@ uniform float glyph_baseline;
*/
void main() {
// We always forward our mode
mode = mode_in;
// Remove any masks from our mode
uint mode_unmasked = mode_in & ~MODE_WIDE_MASK;
// We always forward our mode unmasked because the fragment
// shader doesn't use any of the masks.
mode = mode_unmasked;
// Top-left cell coordinates converted to world space
// Example: (1,0) with a 30 wide cell is converted to (30,0)
@ -101,32 +108,59 @@ void main() {
position.x = (gl_VertexID == 0 || gl_VertexID == 1) ? 1. : 0.;
position.y = (gl_VertexID == 0 || gl_VertexID == 3) ? 0. : 1.;
switch (mode_in) {
// Scaled for wide chars
vec2 cell_size_scaled = cell_size;
if ((mode_in & MODE_WIDE_MASK) == MODE_WIDE_MASK) {
cell_size_scaled.x = cell_size_scaled.x * 2;
}
switch (mode) {
case MODE_BG:
// Calculate the final position of our cell in world space.
// We have to add our cell size since our vertices are offset
// one cell up and to the left. (Do the math to verify yourself)
cell_pos = cell_pos + cell_size * position;
cell_pos = cell_pos + cell_size_scaled * position;
gl_Position = projection * vec4(cell_pos, cell_z, 1.0);
color = bg_color_in / 255.0;
break;
case MODE_FG:
case MODE_FG_COLOR:
vec2 glyph_offset_calc = glyph_offset;
// If the glyph is larger than our cell, we need to downsample it
// TODO: for now, we assume this means it is a full width character
// TODO: in the future, use unicode libs to verify this.
vec2 glyph_size_downsampled = glyph_size;
if (glyph_size.x > cell_size.x) {
glyph_size_downsampled.x = cell_size_scaled.x;
glyph_size_downsampled.y = glyph_size.y * (glyph_size_downsampled.x / glyph_size.x);
glyph_offset_calc.y = glyph_offset.y * (glyph_size_downsampled.x / glyph_size.x);
}
// The glyph_offset.y is the y bearing, a y value that when added
// to the baseline is the offset (+y is up). Our grid goes down.
// So we flip it with `cell_size.y - glyph_offset.y`. The glyph_baseline
// uniform sets our line baseline where characters "sit".
vec2 glyph_offset_calc = glyph_offset;
glyph_offset_calc.y = cell_size.y - glyph_offset.y - glyph_baseline;
glyph_offset_calc.y = cell_size_scaled.y - glyph_offset_calc.y - glyph_baseline;
// Calculate the final position of the cell.
cell_pos = cell_pos + glyph_size * position + glyph_offset_calc;
cell_pos = cell_pos + glyph_size_downsampled * position + glyph_offset_calc;
gl_Position = projection * vec4(cell_pos, cell_z, 1.0);
// We need to convert our texture position and size to normalized
// device coordinates (0 to 1.0) by dividing by the size of the texture.
ivec2 text_size = textureSize(text, 0);
ivec2 text_size;
switch(mode) {
case MODE_FG:
text_size = textureSize(text, 0);
break;
case MODE_FG_COLOR:
text_size = textureSize(text_color, 0);
break;
}
vec2 glyph_tex_pos = glyph_pos / text_size;
vec2 glyph_tex_size = glyph_size / text_size;
glyph_tex_coords = glyph_tex_pos + glyph_tex_size * position;
@ -137,7 +171,7 @@ void main() {
case MODE_CURSOR_RECT:
// Same as background since we're taking up the whole cell.
cell_pos = cell_pos + cell_size * position;
cell_pos = cell_pos + cell_size_scaled * position;
gl_Position = projection * vec4(cell_pos, cell_z, 1.0);
color = bg_color_in / 255.0;
@ -148,7 +182,7 @@ void main() {
screen_cell_pos = cell_pos;
// Same as background since we're taking up the whole cell.
cell_pos = cell_pos + cell_size * position;
cell_pos = cell_pos + cell_size_scaled * position;
gl_Position = projection * vec4(cell_pos, cell_z, 1.0);
color = bg_color_in / 255.0;
@ -168,11 +202,11 @@ void main() {
case MODE_UNDERLINE:
// Make the underline a smaller version of our cell
// TODO: use real font underline thickness
vec2 underline_size = vec2(cell_size.x, cell_size.y*0.05);
vec2 underline_size = vec2(cell_size_scaled.x, cell_size_scaled.y*0.05);
// Position our underline so that it is midway between the glyph
// baseline and the bottom of the cell.
vec2 underline_offset = vec2(cell_size.x, cell_size.y - (glyph_baseline / 2));
vec2 underline_offset = vec2(cell_size_scaled.x, cell_size_scaled.y - (glyph_baseline / 2));
// Go to the bottom of the cell, take away the size of the
// underline, and that is our position. We also float it slightly

182
src/Grid.zig
View File

@ -42,9 +42,10 @@ vao: gl.VertexArray,
ebo: gl.Buffer,
vbo: gl.Buffer,
texture: gl.Texture,
texture_color: gl.Texture,
/// The font atlas.
font_atlas: font.Family,
font_set: font.FallbackSet,
atlas_dirty: bool,
/// Whether the cursor is visible or not. This is used to control cursor
@ -108,7 +109,30 @@ const GPUCell = struct {
bg_a: u8,
/// uint mode
mode: u8,
mode: GPUCellMode,
};
const GPUCellMode = enum(u8) {
bg = 1,
fg = 2,
fg_color = 7,
cursor_rect = 3,
cursor_rect_hollow = 4,
cursor_bar = 5,
underline = 6,
wide_mask = 0b1000_0000,
// Non-exhaustive because masks change it
_,
/// Apply a mask to the mode.
pub fn mask(self: GPUCellMode, m: GPUCellMode) GPUCellMode {
return @intToEnum(
GPUCellMode,
@enumToInt(self) | @enumToInt(m),
);
}
};
pub fn init(alloc: Allocator, config: *const Config) !Grid {
@ -116,10 +140,32 @@ pub fn init(alloc: Allocator, config: *const Config) !Grid {
// font atlas with all the visible ASCII characters since they are common.
var atlas = try Atlas.init(alloc, 512, .greyscale);
errdefer atlas.deinit(alloc);
// Load our emoji font
var atlas_color = try Atlas.init(alloc, 512, .rgba);
errdefer atlas_color.deinit(alloc);
// Build our fallback set so we can look up all codepoints
var font_set: font.FallbackSet = .{};
try font_set.families.ensureTotalCapacity(alloc, 2);
errdefer font_set.deinit(alloc);
// Regular text
font_set.families.appendAssumeCapacity(fam: {
var fam = try font.Family.init(atlas);
errdefer fam.deinit(alloc);
try fam.loadFaceFromMemory(.regular, face_ttf, config.@"font-size");
try fam.loadFaceFromMemory(.bold, face_bold_ttf, config.@"font-size");
break :fam fam;
});
// Emoji
font_set.families.appendAssumeCapacity(fam: {
var fam_emoji = try font.Family.init(atlas_color);
errdefer fam_emoji.deinit(alloc);
try fam_emoji.loadFaceFromMemory(.regular, face_emoji_ttf, config.@"font-size");
break :fam fam_emoji;
});
// Load all visible ASCII characters and build our cell width based on
// the widest character that we see.
@ -127,9 +173,9 @@ pub fn init(alloc: Allocator, config: *const Config) !Grid {
var cell_width: f32 = 0;
var i: u8 = 32;
while (i <= 126) : (i += 1) {
const glyph = try fam.addGlyph(alloc, i, .regular);
if (glyph.advance_x > cell_width) {
cell_width = @ceil(glyph.advance_x);
const goa = try font_set.getOrAddGlyph(alloc, i, .regular);
if (goa.glyph.advance_x > cell_width) {
cell_width = @ceil(goa.glyph.advance_x);
}
}
@ -139,11 +185,13 @@ pub fn init(alloc: Allocator, config: *const Config) !Grid {
// 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: {
const fam = &font_set.families.items[0];
// This is the height reported by the font face
const face_height: i32 = fam.regular.?.unitsToPxY(fam.regular.?.ft_face.*.height);
// Determine the height of the underscore char
const glyph = fam.getGlyph('_', .regular).?;
const glyph = font_set.families.items[0].getGlyph('_', .regular).?;
var res: i32 = fam.regular.?.unitsToPxY(fam.regular.?.ft_face.*.ascender);
res -= glyph.offset_y;
res += @intCast(i32, glyph.height);
@ -154,10 +202,13 @@ pub fn init(alloc: Allocator, config: *const Config) !Grid {
break :cell_height @intToFloat(f32, res);
};
const cell_baseline = cell_height - @intToFloat(
const cell_baseline = cell_baseline: {
const fam = &font_set.families.items[0];
break :cell_baseline cell_height - @intToFloat(
f32,
fam.regular.?.unitsToPxY(fam.regular.?.ft_face.*.ascender),
);
};
log.debug("cell dimensions w={d} h={d} baseline={d}", .{ cell_width, cell_height, cell_baseline });
// Create our shader
@ -172,6 +223,10 @@ pub fn init(alloc: Allocator, config: *const Config) !Grid {
try program.setUniform("cell_size", @Vector(2, f32){ cell_width, cell_height });
try program.setUniform("glyph_baseline", cell_baseline);
// Set all of our texture indexes
try program.setUniform("text", 0);
try program.setUniform("text_color", 1);
// Setup our VAO
const vao = try gl.VertexArray.create();
errdefer vao.destroy();
@ -225,6 +280,7 @@ pub fn init(alloc: Allocator, config: *const Config) !Grid {
// Build our texture
const tex = try gl.Texture.create();
errdefer tex.destroy();
{
const texbind = try tex.bind(.@"2D");
try texbind.parameter(.WrapS, gl.c.GL_CLAMP_TO_EDGE);
try texbind.parameter(.WrapT, gl.c.GL_CLAMP_TO_EDGE);
@ -240,6 +296,28 @@ pub fn init(alloc: Allocator, config: *const Config) !Grid {
.UnsignedByte,
atlas.data.ptr,
);
}
// Build our color texture
const tex_color = try gl.Texture.create();
errdefer tex_color.destroy();
{
const texbind = try tex_color.bind(.@"2D");
try texbind.parameter(.WrapS, gl.c.GL_CLAMP_TO_EDGE);
try texbind.parameter(.WrapT, gl.c.GL_CLAMP_TO_EDGE);
try texbind.parameter(.MinFilter, gl.c.GL_LINEAR);
try texbind.parameter(.MagFilter, gl.c.GL_LINEAR);
try texbind.image2D(
0,
.RGBA,
@intCast(c_int, atlas_color.size),
@intCast(c_int, atlas_color.size),
0,
.BGRA,
.UnsignedByte,
atlas_color.data.ptr,
);
}
return Grid{
.alloc = alloc,
@ -251,7 +329,8 @@ pub fn init(alloc: Allocator, config: *const Config) !Grid {
.ebo = ebo,
.vbo = vbo,
.texture = tex,
.font_atlas = fam,
.texture_color = tex_color,
.font_set = font_set,
.atlas_dirty = false,
.cursor_visible = true,
.cursor_style = .box,
@ -261,9 +340,14 @@ pub fn init(alloc: Allocator, config: *const Config) !Grid {
}
pub fn deinit(self: *Grid) void {
self.font_atlas.atlas.deinit(self.alloc);
self.font_atlas.deinit(self.alloc);
for (self.font_set.families.items) |*family| {
family.atlas.deinit(self.alloc);
family.deinit(self.alloc);
}
self.font_set.deinit(self.alloc);
self.texture.destroy();
self.texture_color.destroy();
self.vbo.destroy();
self.ebo.destroy();
self.vao.destroy();
@ -338,8 +422,19 @@ pub fn finalizeCells(self: *Grid, term: Terminal) !void {
fn addCursor(self: *Grid, term: Terminal) void {
// Add the cursor
if (self.cursor_visible and term.screen.viewportIsBottom()) {
const cell = term.screen.getCell(
term.screen.cursor.y,
term.screen.cursor.x,
);
var mode: GPUCellMode = @intToEnum(
GPUCellMode,
@enumToInt(self.cursor_style),
);
if (cell.attrs.wide == 1) mode = mode.mask(.wide_mask);
self.cells.appendAssumeCapacity(.{
.mode = @enumToInt(self.cursor_style),
.mode = mode,
.grid_col = @intCast(u16, term.screen.cursor.x),
.grid_row = @intCast(u16, term.screen.cursor.y),
.fg_r = 0,
@ -415,6 +510,9 @@ pub fn updateCell(
break :colors res;
};
// If we are a trailing spacer, we never render anything.
if (cell.attrs.wide_spacer_tail == 1) return true;
// Calculate the amount of space we need in the cells list.
const needed = needed: {
var i: usize = 0;
@ -427,8 +525,11 @@ pub fn updateCell(
// If the cell has a background, we always draw it.
if (colors.bg) |rgb| {
var mode: GPUCellMode = .bg;
if (cell.attrs.wide == 1) mode = mode.mask(.wide_mask);
self.cells.appendAssumeCapacity(.{
.mode = 1,
.mode = mode,
.grid_col = @intCast(u16, x),
.grid_row = @intCast(u16, y),
.glyph_x = 0,
@ -456,17 +557,19 @@ pub fn updateCell(
else
.regular;
// Get our glyph
// TODO: if we add a glyph, I think we need to rerender the texture.
const glyph = if (self.font_atlas.getGlyph(cell.char, style)) |glyph|
glyph
else glyph: {
self.atlas_dirty = true;
break :glyph try self.font_atlas.addGlyph(self.alloc, cell.char, style);
};
var mode: GPUCellMode = .fg;
// Get our glyph. Try our normal font atlas first.
const goa = try self.font_set.getOrAddGlyph(self.alloc, cell.char, style);
if (!goa.found_existing) self.atlas_dirty = true;
if (goa.family == 1) mode = .fg_color;
const glyph = goa.glyph;
// If the cell is wide, we need to note that in the mode
if (cell.attrs.wide == 1) mode = mode.mask(.wide_mask);
self.cells.appendAssumeCapacity(.{
.mode = 2,
.mode = mode,
.grid_col = @intCast(u16, x),
.grid_row = @intCast(u16, y),
.glyph_x = glyph.atlas_x,
@ -487,8 +590,11 @@ pub fn updateCell(
}
if (cell.attrs.underline == 1) {
var mode: GPUCellMode = .underline;
if (cell.attrs.wide == 1) mode = mode.mask(.wide_mask);
self.cells.appendAssumeCapacity(.{
.mode = 6, // underline
.mode = mode,
.grid_col = @intCast(u16, x),
.grid_row = @intCast(u16, y),
.glyph_x = 0,
@ -537,20 +643,39 @@ pub fn setScreenSize(self: *Grid, dim: ScreenSize) !void {
/// Updates the font texture atlas if it is dirty.
fn flushAtlas(self: *Grid) !void {
{
const atlas = &self.font_set.families.items[0].atlas;
var texbind = try self.texture.bind(.@"2D");
defer texbind.unbind();
try texbind.subImage2D(
0,
0,
0,
@intCast(c_int, self.font_atlas.atlas.size),
@intCast(c_int, self.font_atlas.atlas.size),
@intCast(c_int, atlas.size),
@intCast(c_int, atlas.size),
.Red,
.UnsignedByte,
self.font_atlas.atlas.data.ptr,
atlas.data.ptr,
);
}
{
const atlas = &self.font_set.families.items[1].atlas;
var texbind = try self.texture_color.bind(.@"2D");
defer texbind.unbind();
try texbind.subImage2D(
0,
0,
0,
@intCast(c_int, atlas.size),
@intCast(c_int, atlas.size),
.BGRA,
.UnsignedByte,
atlas.data.ptr,
);
}
}
/// Render renders the current cell state. This will not modify any of
/// the cells.
pub fn render(self: *Grid) !void {
@ -603,11 +728,15 @@ pub fn render(self: *Grid) !void {
assert(self.gl_cells_written <= self.cells.items.len);
}
// Bind our texture
// Bind our textures
try gl.Texture.active(gl.c.GL_TEXTURE0);
var texbind = try self.texture.bind(.@"2D");
defer texbind.unbind();
try gl.Texture.active(gl.c.GL_TEXTURE1);
var texbind1 = try self.texture_color.bind(.@"2D");
defer texbind1.unbind();
try gl.drawElementsInstanced(
gl.c.GL_TRIANGLES,
6,
@ -686,3 +815,4 @@ test "GridSize update rounding" {
const face_ttf = @embedFile("font/res/FiraCode-Regular.ttf");
const face_bold_ttf = @embedFile("font/res/FiraCode-Bold.ttf");
const face_emoji_ttf = @embedFile("font/res/NotoColorEmoji.ttf");

82
src/font/Face.zig
View File

@ -58,8 +58,31 @@ pub fn loadFaceFromMemory(self: *Face, source: [:0]const u8, size: u32) !void {
if (ftc.FT_Select_Charmap(self.ft_face, ftc.FT_ENCODING_UNICODE) != ftok)
return error.FaceLoadFailed;
// If we have fixed sizes, we just have to try to pick the one closest
// to what the user requested. Otherwise, we can choose an arbitrary
// pixel size.
if (!ftc.FT_HAS_FIXED_SIZES(self.ft_face)) {
if (ftc.FT_Set_Pixel_Sizes(self.ft_face, size, size) != ftok)
return error.FaceLoadFailed;
} else try self.selectSizeNearest(size);
}
/// Selects the fixed size in the loaded face that is closest to the
/// requested pixel size.
fn selectSizeNearest(self: *Face, size: u32) !void {
var i: usize = 0;
var best_i: usize = 0;
var best_diff: i32 = 0;
while (i < self.ft_face.*.num_fixed_sizes) : (i += 1) {
const diff = @intCast(i32, size) - @intCast(i32, self.ft_face.*.available_sizes[i].width);
if (i == 0 or diff < best_diff) {
best_diff = diff;
best_i = i;
}
}
if (ftc.FT_Select_Size(self.ft_face, @intCast(c_int, best_i)) != ftok)
return error.FaceSelectSizeFailed;
}
/// Load a glyph for this face. The codepoint can be either a u8 or
@ -74,21 +97,35 @@ pub fn loadGlyph(self: Face, alloc: Allocator, atlas: *Atlas, cp: u32) !Glyph {
if (idx > 0) break :glyph_index idx;
// Unknown glyph.
log.warn("glyph not found: {x}", .{cp});
// TODO: render something more identifiable than a space
break :glyph_index ftc.FT_Get_Char_Index(self.ft_face, ' ');
//log.warn("glyph not found: {x}", .{cp});
return error.GlyphNotFound;
};
//log.warn("glyph index: {}", .{glyph_index});
// If our glyph has color, we want to render the color
var load_flags: c_int = ftc.FT_LOAD_RENDER;
if (ftc.FT_HAS_COLOR(self.ft_face)) load_flags |= @intCast(c_int, ftc.FT_LOAD_COLOR);
if (ftc.FT_Load_Glyph(
self.ft_face,
glyph_index,
ftc.FT_LOAD_RENDER,
load_flags,
) != ftok) return error.LoadGlyphFailed;
const glyph = self.ft_face.*.glyph;
const bitmap = glyph.*.bitmap;
assert(bitmap.pixel_mode == ftc.FT_PIXEL_MODE_GRAY);
// Ensure we know how to work with the font format. And assure that
// or color depth is as expected on the texture atlas.
const format: Atlas.Format = switch (bitmap.pixel_mode) {
ftc.FT_PIXEL_MODE_GRAY => .greyscale,
ftc.FT_PIXEL_MODE_BGRA => .rgba,
else => {
log.warn("pixel mode={}", .{bitmap.pixel_mode});
@panic("unsupported pixel mode");
},
};
assert(atlas.format == format);
const src_w = bitmap.width;
const src_h = bitmap.rows;
@ -99,24 +136,26 @@ pub fn loadGlyph(self: Face, alloc: Allocator, atlas: *Atlas, cp: u32) !Glyph {
// If we have data, copy it into the atlas
if (region.width > 0 and region.height > 0) {
const depth = @enumToInt(format);
// We can avoid a buffer copy if our atlas width and bitmap
// width match and the bitmap pitch is just the width (meaning
// the data is tightly packed).
const needs_copy = !(tgt_w == bitmap.width and bitmap.width == bitmap.pitch);
const needs_copy = !(tgt_w == bitmap.width and (bitmap.width * depth) == bitmap.pitch);
// If we need to copy the data, we copy it into a temporary buffer.
const buffer = if (needs_copy) buffer: {
var temp = try alloc.alloc(u8, tgt_w * tgt_h);
var temp = try alloc.alloc(u8, tgt_w * tgt_h * depth);
var dst_ptr = temp;
var src_ptr = bitmap.buffer;
var i: usize = 0;
while (i < src_h) : (i += 1) {
std.mem.copy(u8, dst_ptr, src_ptr[0..bitmap.width]);
dst_ptr = dst_ptr[tgt_w..];
std.mem.copy(u8, dst_ptr, src_ptr[0 .. bitmap.width * depth]);
dst_ptr = dst_ptr[tgt_w * depth ..];
src_ptr += @intCast(usize, bitmap.pitch);
}
break :buffer temp;
} else bitmap.buffer[0..(tgt_w * tgt_h)];
} else bitmap.buffer[0..(tgt_w * tgt_h * depth)];
defer if (buffer.ptr != bitmap.buffer) alloc.free(buffer);
// Write the glyph information into the atlas
@ -149,6 +188,8 @@ fn f26dot6ToFloat(v: ftc.FT_F26Dot6) f32 {
}
test {
const testFont = @import("test.zig").fontRegular;
var ft_lib: ftc.FT_Library = undefined;
if (ftc.FT_Init_FreeType(&ft_lib) != ftok)
return error.FreeTypeInitFailed;
@ -170,4 +211,21 @@ test {
}
}
const testFont = @embedFile("res/Inconsolata-Regular.ttf");
test "color emoji" {
const testFont = @import("test.zig").fontEmoji;
var ft_lib: ftc.FT_Library = undefined;
if (ftc.FT_Init_FreeType(&ft_lib) != ftok)
return error.FreeTypeInitFailed;
defer _ = ftc.FT_Done_FreeType(ft_lib);
const alloc = testing.allocator;
var atlas = try Atlas.init(alloc, 512, .rgba);
defer atlas.deinit(alloc);
var font = try init(ft_lib);
defer font.deinit();
try font.loadFaceFromMemory(testFont, 48);
_ = try font.loadGlyph(alloc, &atlas, '🥸');
}

157
src/font/FallbackSet.zig Normal file
View File

@ -0,0 +1,157 @@
//! FallbackSet represents a set of families in priority order to load a glyph.
//! This can be used to merge multiple font families together to find a glyph
//! for a codepoint.
const FallbackSet = @This();
const std = @import("std");
const assert = std.debug.assert;
const Allocator = std.mem.Allocator;
const ftc = @import("freetype").c;
const Atlas = @import("../Atlas.zig");
const Family = @import("main.zig").Family;
const Glyph = @import("main.zig").Glyph;
const Style = @import("main.zig").Style;
const codepoint = @import("main.zig").codepoint;
const ftok = ftc.FT_Err_Ok;
const log = std.log.scoped(.font_fallback);
/// The families to look for in order. This should be managed directly
/// by the caller of the set. Deinit will deallocate this.
families: std.ArrayListUnmanaged(Family) = .{},
/// A quick lookup that points directly to the family that loaded a glyph.
glyphs: std.AutoHashMapUnmanaged(GlyphKey, usize) = .{},
const GlyphKey = struct {
style: Style,
codepoint: u32,
};
pub fn deinit(self: *FallbackSet, alloc: Allocator) void {
self.families.deinit(alloc);
self.glyphs.deinit(alloc);
self.* = undefined;
}
pub const GetOrAdd = struct {
/// Index of the family where the glyph was loaded from
family: usize,
/// True if the glyph was found or whether it was newly loaded
found_existing: bool,
/// The glyph
glyph: *Glyph,
};
pub fn getOrAddGlyph(
self: *FallbackSet,
alloc: Allocator,
v: anytype,
style: Style,
) !GetOrAdd {
assert(self.families.items.len > 0);
// We need a UTF32 codepoint
const utf32 = codepoint(v);
// If we have this already, load it directly
const glyphKey: GlyphKey = .{ .style = style, .codepoint = utf32 };
const gop = try self.glyphs.getOrPut(alloc, glyphKey);
if (gop.found_existing) {
const i = gop.value_ptr.*;
assert(i < self.families.items.len);
return GetOrAdd{
.family = i,
.found_existing = true,
.glyph = self.families.items[i].getGlyph(v, style) orelse unreachable,
};
}
errdefer _ = self.glyphs.remove(glyphKey);
// Go through each familiy and look for a matching glyph
var fam_i: ?usize = 0;
const glyph = glyph: {
for (self.families.items) |*family, i| {
fam_i = i;
// If this family already has it loaded, return it.
if (family.getGlyph(v, style)) |glyph| break :glyph glyph;
// Try to load it.
if (family.addGlyph(alloc, v, style)) |glyph|
break :glyph glyph
else |err| switch (err) {
// TODO: this probably doesn't belong here and should
// be higher level... but how?
error.AtlasFull => {
try family.atlas.grow(alloc, family.atlas.size * 2);
break :glyph try family.addGlyph(alloc, v, style);
},
error.GlyphNotFound => {},
else => return err,
}
}
// If we are regular, we use a fallback character
log.warn("glyph not found, using fallback. codepoint={x}", .{utf32});
fam_i = null;
break :glyph try self.families.items[0].addGlyph(alloc, ' ', style);
};
// If we found a real value, then cache it.
// TODO: support caching fallbacks too
if (fam_i) |i|
gop.value_ptr.* = i
else
_ = self.glyphs.remove(glyphKey);
return GetOrAdd{
.family = fam_i orelse 0,
.glyph = glyph,
// Technically possible that we found this in a cache...
.found_existing = false,
};
}
test {
const fontRegular = @import("test.zig").fontRegular;
const fontEmoji = @import("test.zig").fontEmoji;
const testing = std.testing;
const alloc = testing.allocator;
var set: FallbackSet = .{};
try set.families.append(alloc, fam: {
var fam = try Family.init(try Atlas.init(alloc, 512, .greyscale));
try fam.loadFaceFromMemory(.regular, fontRegular, 48);
break :fam fam;
});
try set.families.append(alloc, fam: {
var fam = try Family.init(try Atlas.init(alloc, 512, .rgba));
try fam.loadFaceFromMemory(.regular, fontEmoji, 48);
break :fam fam;
});
defer {
for (set.families.items) |*family| {
family.atlas.deinit(alloc);
family.deinit(alloc);
}
set.deinit(alloc);
}
// Generate all visible ASCII
var i: u8 = 32;
while (i < 127) : (i += 1) {
_ = try set.getOrAddGlyph(alloc, i, .regular);
}
// Emoji should work
_ = try set.getOrAddGlyph(alloc, '🥸', .regular);
_ = try set.getOrAddGlyph(alloc, '🥸', .bold);
}

13
src/font/Family.zig
View File

@ -11,6 +11,7 @@ const Face = @import("main.zig").Face;
const Glyph = @import("main.zig").Glyph;
const Style = @import("main.zig").Style;
const testFont = @import("test.zig").fontRegular;
const codepoint = @import("main.zig").codepoint;
const log = std.log.scoped(.font_family);
@ -137,22 +138,10 @@ pub fn addGlyph(self: *Family, alloc: Allocator, v: anytype, style: Style) !*Gly
errdefer _ = self.glyphs.remove(glyphKey);
// Get the glyph and add it to the atlas.
// TODO: handle glyph not found
gop.value_ptr.* = try face.loadGlyph(alloc, &self.atlas, utf32);
return gop.value_ptr;
}
/// Returns the UTF-32 codepoint for the given value.
fn codepoint(v: anytype) u32 {
// We need a UTF32 codepoint for freetype
return switch (@TypeOf(v)) {
u32 => v,
comptime_int, u8 => @intCast(u32, v),
[]const u8 => @intCast(u32, try std.unicode.utfDecode(v)),
else => @compileError("invalid codepoint type"),
};
}
test {
const testing = std.testing;
const alloc = testing.allocator;

15
src/font/main.zig
View File

@ -1,6 +1,9 @@
const std = @import("std");
pub const Face = @import("Face.zig");
pub const Family = @import("Family.zig");
pub const Glyph = @import("Glyph.zig");
pub const FallbackSet = @import("FallbackSet.zig");
/// Embedded fonts (for now)
pub const fontRegular = @import("test.zig").fontRegular;
@ -14,8 +17,20 @@ pub const Style = enum {
bold_italic,
};
/// Returns the UTF-32 codepoint for the given value.
pub fn codepoint(v: anytype) u32 {
// We need a UTF32 codepoint for freetype
return switch (@TypeOf(v)) {
u32 => v,
comptime_int, u8 => @intCast(u32, v),
[]const u8 => @intCast(u32, try std.unicode.utfDecode(v)),
else => @compileError("invalid codepoint type"),
};
}
test {
_ = Face;
_ = Family;
_ = Glyph;
_ = FallbackSet;
}

BIN
src/font/res/NotoColorEmoji.ttf Executable file
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1
src/font/test.zig
View File

@ -1,2 +1,3 @@
pub const fontRegular = @embedFile("res/Inconsolata-Regular.ttf");
pub const fontBold = @embedFile("res/Inconsolata-Bold.ttf");
pub const fontEmoji = @embedFile("res/NotoColorEmoji.ttf");

2
src/opengl/Texture.zig
View File

@ -47,6 +47,7 @@ pub const Parameter = enum(c_uint) {
/// Internal format enum for texture images.
pub const InternalFormat = enum(c_int) {
Red = c.GL_RED,
RGBA = c.GL_RGBA,
// There are so many more that I haven't filled in.
_,
@ -55,6 +56,7 @@ pub const InternalFormat = enum(c_int) {
/// Format for texture images
pub const Format = enum(c_uint) {
Red = c.GL_RED,
BGRA = c.GL_BGRA,
// There are so many more that I haven't filled in.
_,

151
src/terminal/Screen.zig
View File

@ -25,8 +25,10 @@ const Screen = @This();
// one day.
const std = @import("std");
const utf8proc = @import("utf8proc");
const assert = std.debug.assert;
const Allocator = std.mem.Allocator;
const color = @import("color.zig");
const point = @import("point.zig");
const Selection = @import("Selection.zig");
@ -71,6 +73,15 @@ pub const Cell = struct {
/// should have this set. The first cell of the next row is actually
/// part of this row in raw input.
wrap: u1 = 0,
/// True if this is a wide character. This char takes up
/// two cells. The following cell ALWAYS is a space.
wide: u1 = 0,
/// Notes that this only exists to be blank for a preceeding
/// wide character (tail) or following (head).
wide_spacer_tail: u1 = 0,
wide_spacer_head: u1 = 0,
} = .{},
/// True if the cell should be skipped for drawing
@ -932,6 +943,10 @@ pub fn selectionString(self: Screen, alloc: Allocator, sel: Selection) ![:0]cons
i += 1;
}
// Skip spacers
if (cell.attrs.wide_spacer_head == 1 or
cell.attrs.wide_spacer_tail == 1) continue;
const char = if (cell.char > 0) cell.char else ' ';
i += try std.unicode.utf8Encode(@intCast(u21, char), buf[i..]);
}
@ -955,6 +970,10 @@ pub fn selectionString(self: Screen, alloc: Allocator, sel: Selection) ![:0]cons
}
}
// Skip spacers
if (cell.attrs.wide_spacer_head == 1 or
cell.attrs.wide_spacer_tail == 1) continue;
const char = if (cell.char > 0) cell.char else ' ';
i += try std.unicode.utf8Encode(@intCast(u21, char), buf[i..]);
}
@ -970,7 +989,7 @@ pub fn selectionString(self: Screen, alloc: Allocator, sel: Selection) ![:0]cons
/// Returns the slices that make up the selection, in order. There are at most
/// two parts to handle the ring buffer. If the selection fits in one contiguous
/// slice, then the second slice will have a length of zero.
fn selectionSlices(self: Screen, sel: Selection) struct {
fn selectionSlices(self: Screen, sel_raw: Selection) struct {
// Top offset can be used to determine if a newline is required by
// seeing if the cell index plus the offset cleanly divides by screen cols.
top_offset: usize,
@ -979,10 +998,35 @@ fn selectionSlices(self: Screen, sel: Selection) struct {
} {
// Note: this function is tested via selectionString
assert(sel.start.y < self.totalRows());
assert(sel.end.y < self.totalRows());
assert(sel.start.x < self.cols);
assert(sel.end.x < self.cols);
assert(sel_raw.start.y < self.totalRows());
assert(sel_raw.end.y < self.totalRows());
assert(sel_raw.start.x < self.cols);
assert(sel_raw.end.x < self.cols);
const sel = sel: {
var sel = sel_raw;
// If the end of our selection is a wide char leader, include the
// first part of the next line.
if (sel.end.x == self.cols - 1) {
const row = self.getRow(.{ .screen = sel.end.y });
if (row[sel.end.x].attrs.wide_spacer_head == 1) {
sel.end.y += 1;
sel.end.x = 0;
}
}
// If the start of our selection is a wide char spacer, include the
// wide char.
if (sel.start.x > 0) {
const row = self.getRow(.{ .screen = sel.start.y });
if (row[sel.start.x].attrs.wide_spacer_tail == 1) {
sel.end.x -= 1;
}
}
break :sel sel;
};
// Get the true "top" and "bottom"
const sel_top = sel.topLeft();
@ -1044,7 +1088,10 @@ pub fn testString(self: Screen, alloc: Allocator, tag: RowIndexTag) ![]const u8
fn testWriteString(self: *Screen, text: []const u8) void {
var y: usize = 0;
var x: usize = 0;
for (text) |c| {
const view = std.unicode.Utf8View.init(text) catch unreachable;
var iter = view.iterator();
while (iter.nextCodepoint()) |c| {
// Explicit newline forces a new row
if (c == '\n') {
y += 1;
@ -1073,7 +1120,39 @@ fn testWriteString(self: *Screen, text: []const u8) void {
row = self.getRow(.{ .active = y });
}
// If our character is double-width, handle it.
const width = utf8proc.charwidth(c);
assert(width == 1 or width == 2);
switch (width) {
1 => row[x].char = @intCast(u32, c),
2 => {
if (x == self.cols - 1) {
row[x].char = ' ';
row[x].attrs.wide_spacer_head = 1;
// wrap
row[x].attrs.wrap = 1;
y += 1;
x = 0;
if (y >= self.rows) {
y -= 1;
self.scroll(.{ .delta = 1 });
}
row = self.getRow(.{ .active = y });
}
row[x].char = @intCast(u32, c);
row[x].attrs.wide = 1;
x += 1;
row[x].char = ' ';
row[x].attrs.wide_spacer_tail = 1;
},
else => unreachable,
}
x += 1;
}
}
@ -1459,6 +1538,66 @@ test "Screen: selectionString wrap around" {
}
}
test "Screen: selectionString wide char" {
const testing = std.testing;
const alloc = testing.allocator;
var s = try init(alloc, 3, 5, 0);
defer s.deinit(alloc);
const str = "1A⚡";
s.testWriteString(str);
{
var contents = try s.selectionString(alloc, .{
.start = .{ .x = 0, .y = 0 },
.end = .{ .x = 3, .y = 0 },
});
defer alloc.free(contents);
const expected = str;
try testing.expectEqualStrings(expected, contents);
}
{
var contents = try s.selectionString(alloc, .{
.start = .{ .x = 0, .y = 0 },
.end = .{ .x = 2, .y = 0 },
});
defer alloc.free(contents);
const expected = str;
try testing.expectEqualStrings(expected, contents);
}
{
var contents = try s.selectionString(alloc, .{
.start = .{ .x = 3, .y = 0 },
.end = .{ .x = 3, .y = 0 },
});
defer alloc.free(contents);
const expected = "⚡";
try testing.expectEqualStrings(expected, contents);
}
}
test "Screen: selectionString wide char with header" {
const testing = std.testing;
const alloc = testing.allocator;
var s = try init(alloc, 3, 5, 0);
defer s.deinit(alloc);
const str = "1ABC⚡";
s.testWriteString(str);
{
var contents = try s.selectionString(alloc, .{
.start = .{ .x = 0, .y = 0 },
.end = .{ .x = 4, .y = 0 },
});
defer alloc.free(contents);
const expected = str;
try testing.expectEqualStrings(expected, contents);
}
}
test "Screen: resize more rows no scrollback" {
const testing = std.testing;
const alloc = testing.allocator;

113
src/terminal/Terminal.zig
View File

@ -6,9 +6,11 @@ const Terminal = @This();
const std = @import("std");
const builtin = @import("builtin");
const utf8proc = @import("utf8proc");
const testing = std.testing;
const assert = std.debug.assert;
const Allocator = std.mem.Allocator;
const ansi = @import("ansi.zig");
const csi = @import("csi.zig");
const sgr = @import("sgr.zig");
@ -341,22 +343,44 @@ pub fn print(self: *Terminal, c: u21) !void {
// If we're not on the main display, do nothing for now
if (self.status_display != .main) return;
// If we're soft-wrapping, then handle that first.
if (self.screen.cursor.pending_wrap and self.modes.autowrap == 1) {
// Mark that the cell is wrapped, which guarantees that there is
// at least one cell after it in the next row.
const cell = self.screen.getCell(self.screen.cursor.y, self.screen.cursor.x);
cell.attrs.wrap = 1;
// Determine the width of this character so we can handle
// non-single-width characters properly.
const width = utf8proc.charwidth(c);
assert(width == 1 or width == 2);
// Move to the next line
self.index();
self.screen.cursor.x = 0;
// If we're soft-wrapping, then handle that first.
if (self.screen.cursor.pending_wrap and self.modes.autowrap == 1)
_ = self.printWrap();
switch (width) {
// Single cell is very easy: just write in the cell
1 => _ = self.printCell(c),
// Wide character requires a spacer. We print this by
// using two cells: the first is flagged "wide" and has the
// wide char. The second is guaranteed to be a spacer if
// we're not at the end of the line.
2 => {
// If we don't have space for the wide char, we need
// to insert spacers and wrap. Then we just print the wide
// char as normal.
if (self.screen.cursor.x == self.cols - 1) {
const spacer_head = self.printCell(' ');
spacer_head.attrs.wide_spacer_head = 1;
_ = self.printWrap();
}
// Build our cell
const cell = self.screen.getCell(self.screen.cursor.y, self.screen.cursor.x);
cell.* = self.screen.cursor.pen;
cell.char = @intCast(u32, c);
const wide_cell = self.printCell(c);
wide_cell.attrs.wide = 1;
// Write our spacer
self.screen.cursor.x += 1;
const spacer = self.printCell(' ');
spacer.attrs.wide_spacer_tail = 1;
},
else => unreachable,
}
// Move the cursor
self.screen.cursor.x += 1;
@ -370,6 +394,69 @@ pub fn print(self: *Terminal, c: u21) !void {
}
}
fn printCell(self: *Terminal, c: u21) *Screen.Cell {
const cell = self.screen.getCell(
self.screen.cursor.y,
self.screen.cursor.x,
);
// If this cell is wide char then we need to clear it.
// We ignore wide spacer HEADS because we can just write
// single-width characters into that.
if (cell.attrs.wide == 1) {
const x = self.screen.cursor.x + 1;
assert(x < self.cols);
const spacer_cell = self.screen.getCell(self.screen.cursor.y, x);
spacer_cell.attrs.wide_spacer_tail = 0;
if (self.screen.cursor.x <= 1) {
self.clearWideSpacerHead();
}
} else if (cell.attrs.wide_spacer_tail == 1) {
assert(self.screen.cursor.x > 0);
const x = self.screen.cursor.x - 1;
const wide_cell = self.screen.getCell(self.screen.cursor.y, x);
wide_cell.attrs.wide = 0;
if (self.screen.cursor.x <= 1) {
self.clearWideSpacerHead();
}
}
// Write
cell.* = self.screen.cursor.pen;
cell.char = @intCast(u32, c);
return cell;
}
fn printWrap(self: *Terminal) *Screen.Cell {
// Mark that the cell is wrapped, which guarantees that there is
// at least one cell after it in the next row.
const cell = self.screen.getCell(
self.screen.cursor.y,
self.screen.cursor.x,
);
cell.attrs.wrap = 1;
// Move to the next line
self.index();
self.screen.cursor.x = 0;
return cell;
}
fn clearWideSpacerHead(self: *Terminal) void {
// TODO: handle deleting wide char on row 0 of active
assert(self.screen.cursor.y >= 1);
const cell = self.screen.getCell(
self.screen.cursor.y - 1,
self.cols - 1,
);
cell.attrs.wide_spacer_head = 0;
}
/// Resets all margins and fills the whole screen with the character 'E'
///
/// Sets the cursor to the top left corner.

10
src/terminal/stream.zig
View File

@ -49,11 +49,11 @@ pub fn Stream(comptime Handler: type) type {
//log.debug("char: {x}", .{c});
const actions = self.parser.next(c);
for (actions) |action_opt| {
if (action_opt) |action| {
if (action != .print) {
log.info("action: {}", .{action});
}
}
// if (action_opt) |action| {
// if (action != .print) {
// log.info("action: {}", .{action});
// }
// }
switch (action_opt orelse continue) {
.print => |p| if (@hasDecl(T, "print")) try self.handler.print(p),
.execute => |code| try self.execute(code),

1
vendor/utf8proc vendored Submodule

@ -0,0 +1 @@
Subproject commit 63f31c908ef7656415f73d6c178f08181239f74c