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x11: Premultiply custom cursor image alpha
As with Wayland, X11 expects cursor pixels to have the alpha premultiplied, so lets convert the non-premultiplied pixels to premultiplied pixels. Fixes #353. Closes #707.
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@ -690,10 +690,12 @@ Cursor _glfwCreateCursorX11(const GLFWimage* image, int xhot, int yhot)
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for (i = 0; i < image->width * image->height; i++, target++, source += 4)
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{
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*target = (source[3] << 24) |
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(source[0] << 16) |
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(source[1] << 8) |
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source[2];
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unsigned char alpha = source[3];
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*target = (alpha << 24) |
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(_glfwMultiplyAlpha(alpha, source[0]) << 16) |
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(_glfwMultiplyAlpha(alpha, source[1]) << 8) |
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_glfwMultiplyAlpha(alpha, source[2]);
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}
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cursor = XcursorImageLoadCursor(_glfw.x11.display, native);
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