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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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include/GLFW/glfw3.h
+56
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@@ -2837,6 +2837,62 @@ GLFWAPI void glfwGetWindowFrameSize(GLFWwindow* window, int* left, int* top, int
*/
GLFWAPI void glfwGetWindowContentScale(GLFWwindow* window, float* xscale, float* yscale);
/*! @brief 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.
*
* @param[in] window The window to query.
* @return The opacity value of the specified window.
*
* @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
* GLFW_PLATFORM_ERROR.
*
* @thread_safety This function must only be called from the main thread.
*
* @sa @ref window_transparency
* @sa @ref glfwSetWindowOpacity
*
* @since Added in version 3.3.
*
* @ingroup window
*/
GLFWAPI float glfwGetWindowOpacity(GLFWwindow* window);
/*! @brief Sets the opacity of the whole window.
*
* This function sets 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.
*
* The initial opacity value for newly created windows is one.
*
* A window created with framebuffer transparency may not use whole window
* transparency. The results of doing this are undefined.
*
* @param[in] window The window to set the opacity for.
* @param[in] opacity The desired opacity of the specified window.
*
* @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
* GLFW_PLATFORM_ERROR.
*
* @thread_safety This function must only be called from the main thread.
*
* @sa @ref window_transparency
* @sa @ref glfwGetWindowOpacity
*
* @since Added in version 3.3.
*
* @ingroup window
*/
GLFWAPI void glfwSetWindowOpacity(GLFWwindow* window, float opacity);
/*! @brief Iconifies the specified window.
*
* This function iconifies (minimizes) the specified window if it was