| 摘要 |
A picture displaying system comprises a computer, a display and a graphical 3D-accelerator having the function of using textures when rendering primitives. A picture file is first decoded to represent the picture in a bit-mapped way. The rectangular area (400) of this picture is divided into small adjacent rectangular areas (502, 508, 510, 512) all having the same size and together covering the picture area. Each small rectangular area is taken to correspond to a texture and thus the bit-mapped graphical data of the picture in each small rectangle are stored in corresponding memory areas for textures used by the accelerator. For each small rectangle and each texture two primitive triangles (702, 704) are created by dividing the rectangle along a diagonal. Each triangle is thus associated with a rectangle and thereby with the texture corresponding to the rectangle in the original large picture. The triangles are then rendered by the accelerator and the rendered picture data are used to display the corresponding picture. Navigating including panning and scaling in the displayed picture is easily performed by recalculating coordinates of the triangles. parts of large pictures can easily be displayed. |
