finalWordWrapPixel function
Implementation
(int, Pixel) finalWordWrapPixel(List<String> multiLines, List<double> columnConstraints, double gridSize, {PixelCombineMode vertMode = PixelCombineMode.TB}){
/// 纵向叠加像素块
final lines = multiLines.expand<Pixel>((singleLine)=>processSinglelineWordWrapPixels(singleLine, columnConstraints, gridSize)).toList();
return (lines.length, combinePixels(lines, combineMode: vertMode));
}