Difference between revisions of "SCI/Specifications/Graphics/Cursor resource"
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Revision as of 11:59, 6 January 2009
The Cursor resource
This resource stores a simple bitmap describing the shape and texture of the mouse pointer. All information stored herein is little endian in byte order.
- 0x00 - 0x01 X coordinate of the mouse cursor hot spot as a 16 bit integer. This variable is not used in SCI0.
- 0x02 - 0x03 Y coordinate of the mouse cursor hot spot as a 16 bit integer. Only 0x03 is used in SCI0; here, if set, the hot spot is at (8,8), if not set, it is located at (0,0).
- 0x04 - 0x23 This is a list of 16 unsigned 16 bit integers constituting bitmasks for the mouse cursor’s transparency map, with the MSB representing the leftmost pixel.
- 0x24 - 0x43 This is another list of 16 unsigned 16 bit integers. Each of them represents another bitmask, determining whether the mouse cursor pixel should be drawn in black (not set) or white (set).
To determine whether or not to draw a pixel, and, if it is to be drawn, in which color it should be drawn in, the corresponding bits of both bitmask lists mentioned above have to be examined. In the table below, A represents a bit from the first list, and B the corresponding bit from the lower list.
Color mapping for the SCI0 mouse pointer
| AB | Result |
| 00 | Transparent |
| 01 | Transparent |
| 10 | 0x00 (Black) |
| 11 | 0x0f (White) |
Color mapping for the SCI1 mouse pointer
Since this method of doing things wastes one combination, the table was changed for SCI01 and SCI1:
| AB | Result |
| 00 | Transparent |
| 01 | 0x0f (White) |
| 10 | 0x00 (Black) |
| 11 | 0x07 (Light Gray) |