/**
* Utility function for measuring and rendering text. The text must not include a tab or emoji.
*
* @param wp the working paint
* @param start the start of the text
* @param end the end of the text
* @param runIsRtl true if the run is right-to-left
* @param c the canvas, can be null if rendering is not needed
* @param x the edge of the run closest to the leading margin
* @param top the top of the line
* @param y the baseline
* @param bottom the bottom of the line
* @param fmi receives metrics information, can be null
* @param needWidth true if the width of the run is needed
* @return the signed width of the run based on the run direction; only valid if needWidth is true
*/
private float handleText(
TextPaint wp,
int start,
int end,
int contextStart,
int contextEnd,
boolean runIsRtl,
Canvas c,
float x,
int top,
int y,
int bottom,
FontMetricsInt fmi,
boolean needWidth) {
// Get metrics first (even for empty strings or "0" width runs)
if (fmi != null) {
/// M: new FontMetrics method for complex text support.
expandMetricsFromPaint(fmi, wp, mText);
}
int runLen = end - start;
// No need to do anything if the run width is "0"
if (runLen == 0) {
return 0f;
}
float ret = 0;
int contextLen = contextEnd - contextStart;
if (needWidth || (c != null && (wp.bgColor != 0 || wp.underlineColor != 0 || runIsRtl))) {
int flags = runIsRtl ? Paint.DIRECTION_RTL : Paint.DIRECTION_LTR;
if (mCharsValid) {
ret =
wp.getTextRunAdvances(mChars, start, runLen, contextStart, contextLen, flags, null, 0);
} else {
int delta = mStart;
ret =
wp.getTextRunAdvances(
mText,
delta + start,
delta + end,
delta + contextStart,
delta + contextEnd,
flags,
null,
0);
}
}
if (c != null) {
if (runIsRtl) {
x -= ret;
}
if (wp.bgColor != 0) {
int previousColor = wp.getColor();
Paint.Style previousStyle = wp.getStyle();
wp.setColor(wp.bgColor);
wp.setStyle(Paint.Style.FILL);
c.drawRect(x, top, x + ret, bottom, wp);
wp.setStyle(previousStyle);
wp.setColor(previousColor);
}
if (wp.underlineColor != 0) {
// kStdUnderline_Offset = 1/9, defined in SkTextFormatParams.h
float underlineTop = y + wp.baselineShift + (1.0f / 9.0f) * wp.getTextSize();
int previousColor = wp.getColor();
Paint.Style previousStyle = wp.getStyle();
boolean previousAntiAlias = wp.isAntiAlias();
wp.setStyle(Paint.Style.FILL);
wp.setAntiAlias(true);
wp.setColor(wp.underlineColor);
c.drawRect(x, underlineTop, x + ret, underlineTop + wp.underlineThickness, wp);
wp.setStyle(previousStyle);
wp.setColor(previousColor);
wp.setAntiAlias(previousAntiAlias);
}
drawTextRun(c, wp, start, end, contextStart, contextEnd, runIsRtl, x, y + wp.baselineShift);
}
return runIsRtl ? -ret : ret;
}