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Add glfwGetWindowOpacity and glfwSetWindowOpacity

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This adds support for setting the opacity of the whole window, including
any decorations.

Fixes #1089.
This commit is contained in:
Camilla Löwy
2017-09-25 23:14:45 +02:00
parent aef4edadd0
commit 11e47f08b1
16 changed files with 354 additions and 12 deletions
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src/win32_window.c
+33
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@@ -1591,6 +1591,39 @@ void _glfwPlatformSetWindowFloating(_GLFWwindow* window, GLFWbool enabled)
SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE);
}
float _glfwPlatformGetWindowOpacity(_GLFWwindow* window)
{
BYTE alpha;
DWORD flags;
if ((GetWindowLongW(window->win32.handle, GWL_EXSTYLE) & WS_EX_LAYERED) &&
GetLayeredWindowAttributes(window->win32.handle, NULL, &alpha, &flags))
{
if (flags & LWA_ALPHA)
return alpha / 255.f;
}
return 1.f;
}
void _glfwPlatformSetWindowOpacity(_GLFWwindow* window, float opacity)
{
if (opacity < 1.f)
{
const BYTE alpha = (BYTE) (255 * opacity);
DWORD style = GetWindowLongW(window->win32.handle, GWL_EXSTYLE);
style |= WS_EX_LAYERED;
SetWindowLongW(window->win32.handle, GWL_EXSTYLE, style);
SetLayeredWindowAttributes(window->win32.handle, 0, alpha, LWA_ALPHA);
}
else
{
DWORD style = GetWindowLongW(window->win32.handle, GWL_EXSTYLE);
style &= ~WS_EX_LAYERED;
SetWindowLongW(window->win32.handle, GWL_EXSTYLE, style);
}
}
void _glfwPlatformPollEvents(void)
{
MSG msg;