tiny.windowing.surface

1pub const surface = surface_module;

1const std = @import("std");2const sys = @import("sys");34pub const Kind = enum {5    wayland,6    x11,7    cocoa,8    unsupported,9};1011pub const Extent = struct {12    width: u32,13    height: u32,14    framebuffer_width: u32,15    framebuffer_height: u32,16    scale_x: f32,17    scale_y: f32,1819    pub fn pixelCount(self: Extent) ?usize {20        return std.math.mul(usize, @as(usize, self.framebuffer_width), @as(usize, self.framebuffer_height)) catch null;21    }22};2324pub const Surface = union(Kind) {25    wayland: Wayland,26    x11: X11,27    cocoa: Cocoa,28    unsupported: Unsupported,2930    pub fn kind(self: Surface) Kind {31        return switch (self) {32            .wayland => .wayland,33            .x11 => .x11,34            .cocoa => .cocoa,35            .unsupported => .unsupported,36        };37    }3839    pub fn extent(self: Surface) Extent {40        return switch (self) {41            .wayland => |value| value.extent,42            .x11 => |value| value.extent,43            .cocoa => |value| value.extent,44            .unsupported => |value| value.extent,45        };46    }47};4849pub const Wayland = struct {50    descriptor: sys.fd.Descriptor,51    surface_id: u32,52    extent: Extent,53};5455pub const X11 = struct {56    connection: *sys.x11.Connection,57    display: sys.x11.display.Target,58    window: u32,59    screen: u32,60    root: u32,61    visual: u32,62    depth: u8,63    red_mask: u32,64    green_mask: u32,65    blue_mask: u32,66    extent: Extent,67};6869pub const Cocoa = struct {70    app: sys.apple.objc.Id,71    window: sys.apple.objc.Id,72    layer: sys.apple.objc.Id,73    extent: Extent,74};7576pub const Unsupported = struct {77    extent: Extent,78};7980pub fn extentFromSizes(81    width: u32,82    height: u32,83    framebuffer_width: u32,84    framebuffer_height: u32,85    scale_x: f32,86    scale_y: f32,87) Extent {88    return .{89        .width = width,90        .height = height,91        .framebuffer_width = framebuffer_width,92        .framebuffer_height = framebuffer_height,93        .scale_x = usableScale(scale_x),94        .scale_y = usableScale(scale_y),95    };96}9798fn usableScale(value: f32) f32 {99    if (!std.math.isFinite(value) or value <= 0) return 1;100    return value;101}102103test "native surface extents sanitize scale and count framebuffer pixels" {104    const extent = extentFromSizes(320, 200, 640, 400, 2, -1);105    try std.testing.expectEqual(@as(u32, 320), extent.width);106    try std.testing.expectEqual(@as(u32, 400), extent.framebuffer_height);107    try std.testing.expectEqual(@as(f32, 2), extent.scale_x);108    try std.testing.expectEqual(@as(f32, 1), extent.scale_y);109    try std.testing.expectEqual(@as(usize, 640 * 400), extent.pixelCount().?);110}111112test "native surface union exposes kind and extent" {113    const extent = extentFromSizes(10, 20, 10, 20, 1, 1);114    const native = Surface{ .unsupported = .{ .extent = extent } };115    try std.testing.expectEqual(Kind.unsupported, native.kind());116    try std.testing.expectEqual(extent, native.extent());117}