initialize method
Implementation
@internal
void initialize(double defaultCharWidth, double charHeight) {
if (width < 0) {
width = defaultCharWidth;
}
if (height < 0) {
height = charHeight;
} else {
assert(
height == charHeight,
'The height of all glyphs must be the same and equal to the font size',
);
}
if (srcLeft < 0) {
srcLeft = left;
srcTop = top;
srcRight = left + width;
srcBottom = top + height;
}
}