Re: performance issues

From: Tomas Frydrych (
Date: Tue Jul 23 2002 - 05:31:43 EDT

  • Next message: Joaquin Cuenca Abela: "Re: performance issues"

    Hi Joaquin,

    > Indeed, this 100 times factor is quite important, because we end
    > calling some fp_Run methods (for each run in each line). We have
    > ~25.6 runs by line, so that means that we call 2560 times some fp_Run
    > methods.

    I guess your document has the text in it justified? In non-justified text
    we only have 1 run per line if the formatting is consisten across the
    line; in justified text we have two runs per word. I think it should be
    straight forward to improve the hanling of justified text so that in the
    TextRun we would keep a vector of pair of numbers {offset,length}
    which would indicate where in the run chunks of spaces start and
    how long they are, and we could draw then our run in segments,
    advancing the drawing point over the spaces. This would save us lot
    of memory and processing time for justified text, costing only 4 extra
    bytes per textrun in non-justified paragraph.

    I am going to look into this particular issue sometime this week.


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