TitleBitmapFactory.java 文件源码

/**
 * @param context   The current Android's context.
 * @param incognito Whether the title are for incognito mode.
 * @param nullFaviconResourceId A drawable resource id of a default favicon.
 */
public TitleBitmapFactory(Context context, boolean incognito, int nullFaviconResourceId) {
    mNullFaviconResourceId = nullFaviconResourceId;

    Resources res = context.getResources();
    int textColor = ApiCompatibilityUtils.getColor(res, incognito
            ? R.color.compositor_tab_title_bar_text_incognito
            : R.color.compositor_tab_title_bar_text);
    float textSize = res.getDimension(R.dimen.compositor_tab_title_text_size);

    boolean fakeBoldText = res.getBoolean(R.bool.compositor_tab_title_fake_bold_text);

    mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
    mTextPaint.setColor(textColor);

    mTextPaint.setTextSize(textSize);
    mTextPaint.setFakeBoldText(fakeBoldText);
    mTextPaint.density = res.getDisplayMetrics().density;

    FontMetrics textFontMetrics = mTextPaint.getFontMetrics();
    mTextHeight = (float) Math.ceil(textFontMetrics.bottom - textFontMetrics.top);
    mTextYOffset = -textFontMetrics.top;

    mFaviconDimension = res.getDimensionPixelSize(R.dimen.compositor_tab_title_favicon_size);
    mViewHeight = (int) Math.max(mFaviconDimension, mTextHeight);

    int width = res.getDisplayMetrics().widthPixels;
    int height = res.getDisplayMetrics().heightPixels;
    mMaxWidth = (int) (TITLE_WIDTH_PERCENTAGE * Math.max(width, height));

    // Set the favicon dimension here.
    mFaviconDimension = Math.min(mMaxWidth, mFaviconDimension);
}