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win32 gui: center double-wide characters

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Jonathan Marler 2025-09-23 14:05:24 -06:00 • committed by CJ van den Berg
parent 921f094509
commit 5cc6724a07
2 changed files with 42 additions and 9 deletions
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4
src/win32/DwriteRenderer.zig
View file

@ -87,7 +87,7 @@ pub fn render(
.left = 0,
.top = 0,
.right = if (double_width)
@as(f32, @floatFromInt(font.cell_size.x)) * @as(f32, @floatFromInt(font.cell_size.x))
@as(f32, @floatFromInt(font.cell_size.x)) * 2
else
@as(f32, @floatFromInt(font.cell_size.x)),
.bottom = @floatFromInt(font.cell_size.y),
@ -100,7 +100,7 @@ pub fn render(
self.render_target.DrawText(
@ptrCast(utf16.ptr),
@intCast(utf16.len),
font.text_format,
if (double_width) font.text_format_double else font.text_format_single,
&rect,
&self.white_brush.ID2D1Brush,
.{},

47
src/win32/dwrite.zig
View file

@ -23,11 +23,13 @@ pub fn init() void {
}
pub const Font = struct {
text_format: *win32.IDWriteTextFormat,
text_format_single: *win32.IDWriteTextFormat,
text_format_double: *win32.IDWriteTextFormat,
cell_size: XY(u16),
pub fn init(dpi: u32, size: f32, face: *const FontFace) Font {
var text_format: *win32.IDWriteTextFormat = undefined;
var text_format_single: *win32.IDWriteTextFormat = undefined;
{
const hr = global.dwrite_factory.CreateTextFormat(
face.ptr(),
@ -37,14 +39,43 @@ pub const Font = struct {
.NORMAL, // stretch
win32.scaleDpi(f32, size, dpi),
win32.L(""), // locale
&text_format,
&text_format_single,
);
if (hr < 0) std.debug.panic(
"CreateTextFormat '{}' height {d} failed, hresult=0x{x}",
.{ std.unicode.fmtUtf16Le(face.slice()), size, @as(u32, @bitCast(hr)) },
);
}
errdefer _ = text_format.IUnknown.Release();
errdefer _ = text_format_single.IUnknown.Release();
var text_format_double: *win32.IDWriteTextFormat = undefined;
{
const hr = global.dwrite_factory.CreateTextFormat(
face.ptr(),
null,
.NORMAL, //weight
.NORMAL, // style
.NORMAL, // stretch
win32.scaleDpi(f32, size, dpi),
win32.L(""), // locale
&text_format_double,
);
if (hr < 0) std.debug.panic(
"CreateTextFormat '{}' height {d} failed, hresult=0x{x}",
.{ std.unicode.fmtUtf16Le(face.slice()), size, @as(u32, @bitCast(hr)) },
);
}
errdefer _ = text_format_double.IUnknown.Release();
{
const hr = text_format_double.SetTextAlignment(win32.DWRITE_TEXT_ALIGNMENT_CENTER);
if (hr < 0) fatalHr("SetTextAlignment", hr);
}
{
const hr = text_format_double.SetParagraphAlignment(win32.DWRITE_PARAGRAPH_ALIGNMENT_CENTER);
if (hr < 0) fatalHr("SetParagraphAlignment", hr);
}
const cell_size: XY(u16) = blk: {
var text_layout: *win32.IDWriteTextLayout = undefined;
@ -52,7 +83,7 @@ pub const Font = struct {
const hr = global.dwrite_factory.CreateTextLayout(
win32.L("█"),
1,
text_format,
text_format_single,
std.math.floatMax(f32),
std.math.floatMax(f32),
&text_layout,
@ -73,13 +104,15 @@ pub const Font = struct {
};
return .{
.text_format = text_format,
.text_format_single = text_format_single,
.text_format_double = text_format_double,
.cell_size = cell_size,
};
}
pub fn deinit(self: *Font) void {
_ = self.text_format.IUnknown.Release();
_ = self.text_format_single.IUnknown.Release();
_ = self.text_format_double.IUnknown.Release();
self.* = undefined;
}