2.2.7.23 MILCMD_VISUAL_SETALPHA
The MILCMD_VISUAL_SETALPHA packet specifies how the rendering of a visual MUST be blended with the background.
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messageSize |
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controlCode |
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targetResource |
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alpha |
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messageSize (4 bytes): A 32-bit unsigned integer. The size of this message in bytes. The value of this field MUST be set to 0x00000014.
controlCode (4 bytes): A 32-bit unsigned integer containing the control code for this message. The value of this field MUST be equal to 0x0000001F.
targetResource (4 bytes): A 32-bit unsigned integer. The value of this field MUST be set to a valid resource handle referencing a resource of type TYPE_VISUAL or TYPE_WINDOWNODE. This handle identifies the resource that is the target for this message.
alpha (8 bytes): A 64-bit floating-point number. The opacity of the specified visual. A value of 0 or less specifies that the visual is completely transparent, whereas a value of 1 or greater specifies that the visual is completely opaque. This value MUST be greater than or equal to 0 and less than or equal to 1.