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RossComputerGuyRossComputerGuy
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feat(scene): add text node
1 parent db46e7b commit 6418611

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4 files changed

+211
-1
lines changed

4 files changed

+211
-1
lines changed

‎src/phantom/scene/backends/fb.zig‎

Lines changed: 31 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -64,3 +64,34 @@ pub const NodeRect = @import("../nodes/rect.zig").NodeRect(struct {
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}).rect(vizops.vector.UsizeVector2.zero(), size, radius, buffer);
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}
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});
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pub const NodeText = @import("../nodes/text.zig").NodeText(struct {
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const Self = @This();
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pub const Scene = @import("fb/scene.zig");
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pub fn frame(self: *NodeText, scene: *Self.Scene, subscene: ?BaseScene.Sub) anyerror!void {
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const startPos: vizops.vector.UsizeVector2 = if (subscene) |sub| sub.pos else .{};
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const view = try std.unicode.Utf8View.init(self.options.text);
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var viewIter = view.iterator();
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var origin = vizops.vector.UsizeVector2.zero();
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while (viewIter.nextCodepoint()) |cp| {
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const glyph = try self.options.font.lookupGlyph(cp);
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try glyph.fb.blt(.to, scene.buffer, .{
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.destOffset = origin.add(startPos).add(.{
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glyph.bearing.value[0],
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-glyph.bearing.value[1],
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}),
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.size = glyph.size,
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});
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origin = origin.add(.{
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glyph.advance.value[0],
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-glyph.advance.value[1],
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});
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}
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}
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});

‎src/phantom/scene/backends/headless.zig‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,6 @@
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pub const Scene = @import("headless/scene.zig");
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pub const NodeArc = @import("../nodes/arc.zig").NodeArc(struct {});
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pub const NodeRect = @import("../nodes/rect.zig").NodeRect(struct {});
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pub const NodeFrameBuffer = @import("../nodes/fb.zig").NodeFb(struct {});
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pub const NodeRect = @import("../nodes/rect.zig").NodeRect(struct {});
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pub const NodeText = @import("../nodes/text.zig").NodeText(struct {});

‎src/phantom/scene/nodes.zig‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1,3 +1,4 @@
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pub const NodeArc = @import("nodes/arc.zig");
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pub const NodeFrameBuffer = @import("nodes/fb.zig");
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pub const NodeRect = @import("nodes/rect.zig");
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pub const NodeText = @import("nodes/text.zig");

‎src/phantom/scene/nodes/text.zig‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,177 @@
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const std = @import("std");
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const Allocator = std.mem.Allocator;
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const vizops = @import("vizops");
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const fonts = @import("../../fonts.zig");
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const Scene = @import("../base.zig");
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const Node = @import("../node.zig");
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pub const Options = struct {
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font: *fonts.Font,
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text: []const u21,
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};
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pub fn NodeText(comptime Impl: type) type {
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return struct {
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const Self = @This();
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const ImplState = if (@hasDecl(Impl, "State")) Impl.State else void;
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const ImplScene = Impl.Scene;
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const State = struct {
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font: *fonts.Font,
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text: []const u21,
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implState: ImplState,
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pub fn init(alloc: Allocator, options: Options) Allocator.Error!*State {
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const self = try alloc.create(State);
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self.* = .{
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.font = options.font,
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.text = try alloc.dupe(u21, options.text),
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.implState = if (ImplState != void) ImplState.init(alloc, options) else {},
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};
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return self;
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}
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pub fn equal(self: *State, other: *State) bool {
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return std.simd.countTrues(@Vector(2, bool){
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self.font == other.font,
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std.mem.eql(u8, self.text, other.text),
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if (ImplState != void) self.implState.equal(other.implState) else true,
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}) == 2;
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}
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pub fn deinit(self: *State, alloc: Allocator) void {
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if (ImplState != void) self.implState.deinit(alloc);
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alloc.free(self.text);
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alloc.destroy(self);
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}
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};
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options: Options,
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node: Node,
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impl: Impl,
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pub fn new(alloc: Allocator, id: ?usize, options: Options) Allocator.Error!*Node {
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const self = try alloc.create(Self);
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self.* = .{
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.options = .{
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.font = options.font,
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.text = try alloc.dupe(u21, options.text),
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},
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.node = .{
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.allocator = alloc,
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.ptr = self,
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.type = @typeName(Self),
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.id = id orelse @returnAddress(),
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.vtable = &.{
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.dupe = dupe,
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.state = state,
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.preFrame = preFrame,
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.frame = frame,
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.deinit = deinit,
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.format = format,
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},
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},
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.impl = undefined,
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};
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if (@hasDecl(Impl, "new")) {
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try Impl.init(self);
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}
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return &self.node;
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}
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fn stateEqual(ctx: *anyopaque, otherctx: *anyopaque) bool {
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const self: *State = @ptrCast(@alignCast(ctx));
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const other: *State = @ptrCast(@alignCast(otherctx));
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return self.equal(other);
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}
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fn stateFree(ctx: *anyopaque, alloc: std.mem.Allocator) void {
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const self: *State = @ptrCast(@alignCast(ctx));
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self.deinit(alloc);
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}
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fn calcSize(self: *Self) !vizops.vector.UsizeVector2 {
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const view = try std.unicode.Utf8View.init(self.options.text);
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var viewIter = view.iterator();
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var width: usize = 0;
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var yMaxMin = vizops.vector.UsizeVector2.zero();
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while (viewIter.nextCodepoint()) |cp| {
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const glyph = try self.options.font.lookupGlyph(cp);
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width += glyph.advance.value[0];
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yMaxMin.value[0] = @max(yMaxMin.value[0], glyph.bearing.value[1]);
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yMaxMin.value[1] = @min(yMaxMin.value[1], glyph.bearing.value[1] - glyph.size.value[1]);
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}
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return .{ .value = .{ width, yMaxMin.value[0] - yMaxMin.value[1] } };
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}
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fn dupe(ctx: *anyopaque) anyerror!*Node {
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const self: *Self = @ptrCast(@alignCast(ctx));
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return try new(self.node.allocator, @returnAddress(), self.options);
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}
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fn state(ctx: *anyopaque, frameInfo: Node.FrameInfo) anyerror!Node.State {
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const self: *Self = @ptrCast(@alignCast(ctx));
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return .{
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.size = try calcSize(self),
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.frame_info = frameInfo,
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.allocator = self.node.allocator,
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.ptr = try State.init(self.node.allocator, self.options),
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.ptrEqual = stateEqual,
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.ptrFree = stateFree,
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.type = @typeName(Self),
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};
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}
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fn preFrame(ctx: *anyopaque, frameInfo: Node.FrameInfo, baseScene: *Scene) anyerror!Node.State {
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const self: *Self = @ptrCast(@alignCast(ctx));
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if (@hasDecl(Impl, "preFrame")) {
134+
try Impl.preFrame(self, frameInfo, @ptrCast(@alignCast(baseScene.ptr)), baseScene.subscene);
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}
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return .{
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.size = try calcSize(self),
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.frame_info = frameInfo,
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.allocator = self.node.allocator,
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.ptr = try State.init(self.node.allocator, self.options),
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.ptrEqual = stateEqual,
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.ptrFree = stateFree,
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.type = @typeName(Self),
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};
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}
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fn frame(ctx: *anyopaque, baseScene: *Scene) anyerror!void {
149+
const self: *Self = @ptrCast(@alignCast(ctx));
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if (@hasDecl(Impl, "frame")) {
152+
try Impl.frame(self, @ptrCast(@alignCast(baseScene.ptr)), baseScene.subscene);
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}
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}
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fn deinit(ctx: *anyopaque) void {
157+
const self: *Self = @ptrCast(@alignCast(ctx));
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if (@hasDecl(Impl, "deinit")) {
160+
Impl.deinit(self);
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}
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self.node.allocator.free(self.options.text);
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self.node.allocator.destroy(self);
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}
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fn format(ctx: *anyopaque, _: ?Allocator) anyerror!std.ArrayList(u8) {
168+
const self: *Self = @ptrCast(@alignCast(ctx));
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var output = std.ArrayList(u8).init(self.node.allocator);
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errdefer output.deinit();
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try output.writer().print("{{ .font = {}, .text = \"{s}\" }}", .{ self.options.font, self.options.text });
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return output;
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}
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};
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}

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