WORD AlphaBlendWindow( DWORD foregroundArea, SHORT foregroundLeft, SHORT foregroundTop, DWORD backgroundArea, SHORT backgroundLeft, SHORT backgroundTop, DWORD destinationArea, SHORT destinationLeft, SHORT destinationTop, WORD width, WORD height, BYTE alphaPercentage );
This Alpha-Blends a foreground and a background stored in frames to a destination window. A frame is a memory area that contain array of pixels information. An example would be a display buffer. This operation can be performed on a single frame (where foregroundArea, backgroundArea and destinationArea all points to the same frame), 2 frames (where two of the three areas are pointing to the same frame and one is another frame), or 3 frames (where each area is a separate frame). The Alpha-Blending is performed on the windows inside the specified frames. These windows are defined by the offsets for each frame and the given width and height. The Alpha-Blended windows are always equal in sizes. This function is only available when it is supported by the display driver used. Enabling this feature requires the macros USE_ALPHABLEND_LITE or USE_ALPHABLEND defined in the GraphicsConfig.h.
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Input Parameters |
Description |
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DWORD foregroundArea |
Defines the starting address/page of the foreground window. |
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SHORT foregroundLeft |
Defines the foreground horizontal offset in pixels starting from the starting address/page defined by foregroundArea. |
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SHORT foregroundTop |
Defines the foreground vertical offset in pixels starting from the starting address/page defined by foregroundArea. |
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DWORD backgroundArea |
Defines the starting address/page of the background window. |
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SHORT backgroundLeft |
Defines the background horizontal offset in pixels starting from the starting address/page defined by backgroundArea. |
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SHORT backgroundTop |
Defines the background vertical offset in pixels starting from the starting address/page defined by backgroundArea. |
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DWORD destinationArea |
Defines the starting address/page of the destination window. |
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SHORT destinationLeft |
Defines the destination horizontal offset in pixels starting from the starting address/page defined by destinationArea. |
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SHORT destinationTop |
Defines the destination vertical offset in pixels starting from the starting address/page defined by destinationArea. |
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WORD width |
Defines the width of the window to be alpha blended. |
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WORD height |
Defines the height of the window to be alpha blended. |
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BYTE alphaPercentage |
This defines the amount of transparency to give the foreground Window. Valid range is 0-100. Actual allowed values may be limited by the driver used. Refer to the specific driver for allowed values. |
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