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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/x11_window.c
+32 -5
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@@ -2449,11 +2449,7 @@ int _glfwPlatformFramebufferTransparent(_GLFWwindow* window)
if (!window->x11.transparent)
return GLFW_FALSE;
// Check whether a compositing manager is running
char name[32];
snprintf(name, sizeof(name), "_NET_WM_CM_S%u", _glfw.x11.screen);
const Atom selection = XInternAtom(_glfw.x11.display, name, False);
return XGetSelectionOwner(_glfw.x11.display, selection) != None;
return XGetSelectionOwner(_glfw.x11.display, _glfw.x11.NET_WM_CM_Sx) != None;
}
void _glfwPlatformSetWindowResizable(_GLFWwindow* window, GLFWbool enabled)
@@ -2559,6 +2555,37 @@ void _glfwPlatformSetWindowFloating(_GLFWwindow* window, GLFWbool enabled)
XFlush(_glfw.x11.display);
}
float _glfwPlatformGetWindowOpacity(_GLFWwindow* window)
{
float opacity = 1.f;
if (XGetSelectionOwner(_glfw.x11.display, _glfw.x11.NET_WM_CM_Sx))
{
CARD32* value = NULL;
if (_glfwGetWindowPropertyX11(window->x11.handle,
_glfw.x11.NET_WM_WINDOW_OPACITY,
XA_CARDINAL,
(unsigned char**) &value))
{
opacity = (float) (*value / (double) 0xffffffffu);
}
if (value)
XFree(value);
}
return opacity;
}
void _glfwPlatformSetWindowOpacity(_GLFWwindow* window, float opacity)
{
const CARD32 value = (CARD32) (0xffffffffu * (double) opacity);
XChangeProperty(_glfw.x11.display, window->x11.handle,
_glfw.x11.NET_WM_WINDOW_OPACITY, XA_CARDINAL, 32,
PropModeReplace, (unsigned char*) &value, 1);
}
void _glfwPlatformPollEvents(void)
{
_GLFWwindow* window;