| 摘要 |
Methods and apparatus for rendering and/or displaying images such as text using sub-pixel accuracy are described. In various embodiments, character advance width is determined using pixel precision while left side bearing and/or black body width is determined using sub-pixel precision. Such embodiments provide for characters with overall widths corresponding to pixel widths but with the character black bodies being positioned within the overall character space to a higher degree of position than when pixel precision is used. In other embodiments, sub-pixel precision is used for determining a character's overall width as well as left side bearing and black body width values. In such embodiments, black body starting points and left side bearing points are aligned with sub-pixel component boundaries. By treating R, G, B pixel element sub-components as independent luminous intensity sources and by using pixel sub-component accuracy for character width, spacing and positioning, overall image appearance is enhanced as compared to embodiments which use pixel precision for character width, spacing and positioning values. |
