[pango] tailing whitespace problem when wrap is applied

[deokjin kim <deokjin81 kim samsung com>]

Dear all,

 

When wrap is applied, successive tailing whitespace causes some problem.

Successive tailing whitespace gets out layout’s width range despite of character wrap.

 

When I investigate it, below code cause above situation.

(pango/pango/break.c : pango_default_break() 1013 lines)

Pango original source

Pango modified source

switch (break_type) {            case G_UNICODE_BREAK_MANDATORY:            case G_UNICODE_BREAK_LINE_FEED:            case G_UNICODE_BREAK_CARRIAGE_RETURN:            case G_UNICODE_BREAK_NEXT_LINE:            case G_UNICODE_BREAK_SPACE:            /* These types all "pile up" at the end of lines and             * get elided.             */            break_op = BREAK_PROHIBITED;            break;              case G_UNICODE_BREAK_CONTINGENT:            /* break before 0xFFFC by default, eventually            * make this configurable?            */            break_op = BREAK_ALLOWED;            break;

switch (break_type) {            case G_UNICODE_BREAK_MANDATORY:            case G_UNICODE_BREAK_LINE_FEED:            case G_UNICODE_BREAK_CARRIAGE_RETURN:            case G_UNICODE_BREAK_NEXT_LINE:            //case G_UNICODE_BREAK_SPACE:            /* These types all "pile up" at the end of lines and             * get elided.             */            break_op = BREAK_PROHIBITED;            break;              case G_UNICODE_BREAK_CONTINGENT: case G_UNICODE_BREAK_SPACE:            /* break before 0xFFFC by default, eventually            * make this configurable?            */            break_op = BREAK_ALLOWED;            break;

 

My question is

1.     What’s the reason of above code? (why break is prohibited when break_type is G_UNICODE_BREAK_SPACE?)

2.     Do you know good solution? (fore reference, I used pango 1.26.1 version)

 

Best Regards,

Deokjin kim