zig/mach
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

glfw: add Window.getOpacity

Browse source 
Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2021-07-25 19:36:41 -07:00
parent c98b2c73f8
commit 14f4e4aaf2
1 changed files with 37 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

37
glfw/src/Window.zig
View file

@ -572,6 +572,27 @@ pub inline fn getContentScale(self: Window) Error!ContentScale {
return ContentScale{ .x_scale = x_scale, .y_scale = y_scale };
}
/// Returns the opacity of the whole window.
///
/// This function returns the opacity of the window, including any decorations.
///
/// The opacity (or alpha) value is a positive finite number between zero and one, where zero is
/// fully transparent and one is fully opaque. If the system does not support whole window
/// transparency, this function always returns one.
///
/// The initial opacity value for newly created windows is one.
///
/// 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_transparency, glfw.Window.setOpacity
pub inline fn getOpacity(self: Window) Error!f32 {
const opacity = c.glfwGetWindowOpacity(self.handle);
try getError();
return opacity;
}
test "defaultHints" {
const glfw = @import("main.zig");
try glfw.init();
@ -821,3 +842,19 @@ test "getContentScale" {
_ = try window.getContentScale();
}
test "getOpacity" {
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.getOpacity();
}