Implement isSrgb()

https://github.com/SFML/SFML/pull/1757

include/SFML/Graphics/RenderTexture.h

@@ -85,6 +85,16 @@ CSFML_GRAPHICS_API void sfRenderTexture_destroy(sfRenderTexture* renderTexture);
 ////////////////////////////////////////////////////////////
 CSFML_GRAPHICS_API sfVector2u sfRenderTexture_getSize(const sfRenderTexture* renderTexture);
 
+////////////////////////////////////////////////////////////
+/// \brief Tell if the render texture will use sRGB encoding when drawing on it
+///
+/// \param renderTexture Render texture object
+///
+/// \return sfTrue if the render texture use sRGB encoding, sfFalse otherwise
+///
+////////////////////////////////////////////////////////////
+CSFML_GRAPHICS_API sfBool sfRenderTexture_isSrgb(const sfRenderTexture* renderTexture);
+
 ////////////////////////////////////////////////////////////
 /// \brief Activate or deactivate a render texture as the current target for rendering
 ///

include/SFML/Graphics/RenderWindow.h

@@ -161,6 +161,16 @@ CSFML_GRAPHICS_API void sfRenderWindow_setPosition(sfRenderWindow* renderWindow,
 ////////////////////////////////////////////////////////////
 CSFML_GRAPHICS_API sfVector2u sfRenderWindow_getSize(const sfRenderWindow* renderWindow);
 
+////////////////////////////////////////////////////////////
+/// \brief Tell if the render window will use sRGB encoding when drawing on it
+///
+/// \param renderWindow Render window object
+///
+/// \return sfTrue if the render window use sRGB encoding, sfFalse otherwise
+///
+////////////////////////////////////////////////////////////
+CSFML_GRAPHICS_API sfBool sfRenderWindow_isSrgb(const sfRenderWindow* renderWindow);
+
 ////////////////////////////////////////////////////////////
 /// \brief Change the size of the rendering region of a render window
 ///