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glfw: add Window.getContentScale

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2021-07-25 19:34:09 -07:00
parent 5891912171
commit c98b2c73f8
1 changed files with 46 additions and 0 deletions
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46
glfw/src/Window.zig
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@ -542,6 +542,36 @@ pub inline fn getFrameSize(self: Window) Error!FrameSize {
};
}
pub const ContentScale = struct {
x_scale: f32,
y_scale: f32,
};
/// Retrieves the content scale for the specified window.
///
/// This function retrieves the content scale for the specified window. The content scale is the
/// ratio between the current DPI and the platform's default DPI. This is especially important for
/// text and any UI elements. If the pixel dimensions of your UI scaled by this look appropriate on
/// your machine then it should appear at a reasonable size on other machines regardless of their
/// DPI and scaling settings. This relies on the system DPI and scaling settings being somewhat
/// correct.
///
/// On systems where each monitors can have its own content scale, the window content scale will
/// depend on which monitor the system considers the window to be on.
///
/// Possible errors include glfw.Error.NotInitialized and glfw.Error.PlatformError.
///
/// @thread_safety This function must only be called from the main thread.
///
/// see also: window_scale, glfwSetWindowContentScaleCallback, glfwGetMonitorContentScale
pub inline fn getContentScale(self: Window) Error!ContentScale {
var x_scale: f32 = 0;
var y_scale: f32 = 0;
c.glfwGetWindowContentScale(self.handle, &x_scale, &y_scale);
try getError();
return ContentScale{ .x_scale = x_scale, .y_scale = y_scale };
}
test "defaultHints" {
const glfw = @import("main.zig");
try glfw.init();
@ -775,3 +805,19 @@ test "getFrameSize" {
_ = try window.getFrameSize();
}
test "getContentScale" {
const glfw = @import("main.zig");
try glfw.init();
defer glfw.terminate();
const window = glfw.Window.create(640, 480, "Hello, Zig!", null, null) catch |err| {
// return without fail, because most of our CI environments are headless / we cannot open
// windows on them.
std.debug.print("note: failed to create window: {}\n", .{err});
return;
};
defer window.destroy();
_ = try window.getContentScale();
}