Alpha-Blend support are two levels. USE_ALPHABLEND_LITE and USE_ALPHA_BLEND.
When this macro is enabled in GraphicsConfig.h, Primitive Layer support for an Alpha-Blended Bar() is enabled.
A rectangular area can be Alpha-Blended with a specific color by doing the following:
- SetAlpha() - this will set the Alpha-Blend value
- SetColor() - this will define the color that will be Alpha-Blended to the rectangular area
- Bar(left, top, right, bottom) - this will perform the Alpha-Blending on the rectangular area defined by left, top, right and bottom parameters.
This is full Alpha-Blend support but is mainly performed by the display driver used. Windows can be Alpha-Blended using the driver level routines with or without the hardware acceleration. Refer to the specific display driver for support.
Functions
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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... more |
Macros
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This macro sets the alpha value. Enabling this feature requires the macros USE_ALPHABLEND_LITE defined in the GraphicsConfig.h. See USE_ALPHABLEND_LITE for information on supported primitive rendering functions. | |
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This macro returns the current alpha value. Enabling this feature requires the macros USE_ALPHABLEND_LITE defined in the GraphicsConfig.h. |
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