121 lines
3.6 KiB
Zig
121 lines
3.6 KiB
Zig
const DwriteRenderer = @This();
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const std = @import("std");
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const win32 = @import("win32").everything;
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const win32ext = @import("win32ext.zig");
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const dwrite = @import("dwrite.zig");
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const XY = @import("xy.zig").XY;
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pub const Font = dwrite.Font;
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pub const Fonts = dwrite.Fonts;
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pub const needs_direct2d = true;
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render_target: *win32.ID2D1RenderTarget,
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white_brush: *win32.ID2D1SolidColorBrush,
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pub fn init(
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d2d_factory: *win32.ID2D1Factory,
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texture: *win32.ID3D11Texture2D,
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) DwriteRenderer {
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const dxgi_surface = win32ext.queryInterface(texture, win32.IDXGISurface);
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defer _ = dxgi_surface.IUnknown.Release();
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var render_target: *win32.ID2D1RenderTarget = undefined;
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{
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const props = win32.D2D1_RENDER_TARGET_PROPERTIES{
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.type = .DEFAULT,
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.pixelFormat = .{
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.format = .A8_UNORM,
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.alphaMode = .PREMULTIPLIED,
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},
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.dpiX = 0,
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.dpiY = 0,
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.usage = .{},
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.minLevel = .DEFAULT,
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};
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const hr = d2d_factory.CreateDxgiSurfaceRenderTarget(
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dxgi_surface,
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&props,
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&render_target,
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);
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if (hr < 0) fatalHr("CreateDxgiSurfaceRenderTarget", hr);
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}
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errdefer _ = render_target.IUnknown.Release();
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{
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const dc = win32ext.queryInterface(render_target, win32.ID2D1DeviceContext);
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defer _ = dc.IUnknown.Release();
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dc.SetUnitMode(win32.D2D1_UNIT_MODE_PIXELS);
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}
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var white_brush: *win32.ID2D1SolidColorBrush = undefined;
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{
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const hr = render_target.CreateSolidColorBrush(
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&.{ .r = 1.0, .g = 1.0, .b = 1.0, .a = 1.0 },
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null,
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&white_brush,
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);
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if (hr < 0) fatalHr("CreateSolidColorBrush", hr);
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}
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errdefer _ = white_brush.IUnknown.Release();
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return .{
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.render_target = render_target,
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.white_brush = white_brush,
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};
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}
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pub fn deinit(self: *DwriteRenderer) void {
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_ = self.white_brush.IUnknown.Release();
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_ = self.render_target.IUnknown.Release();
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self.* = undefined;
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}
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pub fn render(
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self: *const DwriteRenderer,
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font: Font,
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utf8: []const u8,
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double_width: bool,
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) void {
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var utf16_buf: [10]u16 = undefined;
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const utf16_len = std.unicode.utf8ToUtf16Le(&utf16_buf, utf8) catch unreachable;
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const utf16 = utf16_buf[0..utf16_len];
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std.debug.assert(utf16.len <= 2);
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{
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const rect: win32.D2D_RECT_F = .{
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.left = 0,
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.top = 0,
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.right = if (double_width)
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@as(f32, @floatFromInt(font.cell_size.x)) * 2
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else
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@as(f32, @floatFromInt(font.cell_size.x)),
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.bottom = @floatFromInt(font.cell_size.y),
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};
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self.render_target.BeginDraw();
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{
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const color: win32.D2D_COLOR_F = .{ .r = 0, .g = 0, .b = 0, .a = 0 };
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self.render_target.Clear(&color);
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}
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self.render_target.DrawText(
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@ptrCast(utf16.ptr),
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@intCast(utf16.len),
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if (double_width) font.text_format_double else font.text_format_single,
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&rect,
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&self.white_brush.ID2D1Brush,
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.{},
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.NATURAL,
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);
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var tag1: u64 = undefined;
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var tag2: u64 = undefined;
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const hr = self.render_target.EndDraw(&tag1, &tag2);
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if (hr < 0) std.debug.panic(
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"D2D DrawText failed, hresult=0x{x}, tag1={}, tag2={}",
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.{ @as(u32, @bitCast(hr)), tag1, tag2 },
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);
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}
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}
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fn fatalHr(what: []const u8, hresult: win32.HRESULT) noreturn {
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std.debug.panic("{s} failed, hresult=0x{x}", .{ what, @as(u32, @bitCast(hresult)) });
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}
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