FontInfo.java 文件源码

FontInfo(Font origFont, JTextComponent textComponent, FontRenderContext frc, float rowHeightCorrection, int textZoom) {
    renderFont = (textZoom != 0)
            ? new Font(origFont.getName(), origFont.getStyle(), Math.max(origFont.getSize() + textZoom, 1))
            : origFont;
    char defaultChar = 'A';
    String defaultCharText = String.valueOf(defaultChar);
    TextLayout defaultCharTextLayout = new TextLayout(defaultCharText, renderFont, frc); // NOI18N
    TextLayout rowHeightTextLayout = new TextLayout("A_|B", renderFont, frc);
    // Round the ascent to eliminate long mantissa without any visible effect on rendering.
    updateRowHeight(rowHeightTextLayout, rowHeightCorrection);
    // Ceil fractions to whole numbers since this measure may be used for background rendering
    charWidth = (float) Math.ceil(defaultCharTextLayout.getAdvance());
    LineMetrics lineMetrics = renderFont.getLineMetrics(defaultCharText, frc);
    underlineAndStrike[0] = lineMetrics.getUnderlineOffset() * rowHeightCorrection;
    underlineAndStrike[1] = lineMetrics.getUnderlineThickness();
    underlineAndStrike[2] = lineMetrics.getStrikethroughOffset() * rowHeightCorrection;
    underlineAndStrike[3] = lineMetrics.getStrikethroughThickness();
    if (LOG.isLoggable(Level.FINE)) {
        FontMetrics fm = textComponent.getFontMetrics(origFont); // From original font
        LOG.fine("Orig Font=" + origFont + // NOI18N
                "\n  " + this + ", charWidth=" + charWidth + ", textZoom=" + textZoom + // NOI18N
                "\n  rowHeightCorrection=" + rowHeightCorrection + // NOI18N
                ", underlineO/T=" + underlineAndStrike[0] + "/" + underlineAndStrike[1] + // NOI18N
                ", strikethroughO/T=" + underlineAndStrike[2] + "/" + underlineAndStrike[3] + // NOI18N
                "\n  FontMetrics (for comparison; without-RHC): fm-line-height=" + fm.getHeight() + // NOI18N
                ", fm-ascent,descent,leading=" + fm.getAscent() + "," + fm.getDescent() + "," + fm.getLeading() + // NOI18N
                "\n"); // NOI18N
        if (LOG.isLoggable(Level.FINEST)) {
            LOG.log(Level.FINEST, "FontInfo creation stacktrace", new Exception()); // NOI18N
        }
    }
}