| 摘要 |
A method and system for rendering computer graphics display tear-free is provided by determining a safe region for each associated block transfer command in real time. In response to a request of a graphics application program, a block transfer type is determined according to relative positions of a destination bitmap, and a source bitmap on the frame buffer. The invention defines three block transfer types: a top-down block transfer type, a bottom-up block transfer type and a direct block transfer type. Each of these block transfer types has an associated block transfer command for issuing to a command queue. After receiving each associated block transfer command, a safe region for an associated block transfer command will be determined in real time. Then, information from a source bitmap is transferred to a destination bitmap when the position of the current scan line is within the determined safe region defined for the associated block transfer command.
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