Fix Paint_Delegate.native_getRunAdvance()

        float[] advances = new float[count];

        native_getTextRunAdvances(nativePaint, nativeTypeface, text, start, count,

                contextStart, contextEnd - contextStart, isRtl, advances, 0);

        int startOffset = offset - start;  // offset from start.

        float sum = 0;

        for (int i = 0; i < offset; i++) {

        for (int i = 0; i < startOffset; i++) {

            sum += advances[i];

        }

        return sum;