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点阵字体.
点阵字体(Dot-matrix-fonts)也叫位图字体(Bitmap-fonts),其中每个字形都以一组二维像素资讯表示。这种文字显示方式于较早前的电脑系统(例如未有图形接口时的 DOS 操作系统)被普遍采用。由于位图的缘故,点阵字体很难进行缩放,特定的点阵字体只能清晰地显示在相应的字号下,否则文字只被强行放大而失真字形,产生成马赛克式的锯齿边缘。但对于字号 8-14px 的尺寸较小的汉字字体(即现今操作系统大多采用的默认字号)现今亦仍然被使用于荧幕显示上,能够提供更高的显示效果;不过现今该种点阵字体主要只作为“辅助”的部分,当用户设置的字体尺寸并无拥有点阵图像时,字体便会以向量图方式显示;而当打印时,印有字体无论大小亦会使用向量字体打印。
现在的一些字体渲染系统直接抛弃了点阵字体,而使用一些算法进行带抗锯齿的矢量渲染。
常见的纯点阵字体有bdf、pcf、fnt、hbf等格式。
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