hangs in stroke_to, triggered by large coordinates with some settings.

[feverzsj]

following code hangs in last stroke_to:

#include <libmypaint/mypaint.h>
#include <libmypaint/mypaint-brush.h>

int draw_dab(MyPaintSurface*, float, float, float, float, float, float, float, float, float,
             float, float, float, float, float, float, float, float)
{
    return TRUE;
}

void get_color(MyPaintSurface*, float, float, float,
               float* color_r, float* color_g, float* color_b, float* color_a,
               float)
{
    *color_r = 0;
    *color_g = 0;
    *color_b = 0;
    *color_a = 0;
}

void stroke_to(MyPaintBrush *brush, MyPaintSurface *surf, float x, float y)
{
    float viewzoom = 1.0, viewrotation = 0.0, barrel_rotation = 0.0;
    float pressure = 1.0, ytilt = 0.0, xtilt = 0.0, dtime = 1.0/10;
    gboolean linear = FALSE;
    mypaint_brush_stroke_to(brush, surf, x, y, pressure, xtilt, ytilt, dtime, viewzoom, viewrotation, barrel_rotation, linear);
}

int main()
{
    MyPaintSurface sf = {.draw_dab = draw_dab, .get_color = get_color};

    MyPaintBrush *brush = mypaint_brush_new();
    mypaint_brush_from_defaults(brush);
    mypaint_brush_set_base_value(brush, MYPAINT_BRUSH_SETTING_RADIUS_LOGARITHMIC, 0.3); // >= 0.35 ok
    mypaint_brush_set_base_value(brush, MYPAINT_BRUSH_SETTING_DABS_PER_ACTUAL_RADIUS, 4.0); // <= 3.9 ok

    stroke_to(brush, &sf, 4194298.5, 4194154.0);
//     stroke_to(brush, &sf, 4194286.5, 4194141.0);
//     stroke_to(brush, &sf, 4194269.5, 4194135.0);
//     stroke_to(brush, &sf, 4194247.5, 4194124.0);
//     stroke_to(brush, &sf, 4194221.5, 4194124.0);
//     stroke_to(brush, &sf, 4194191.5, 4194124.0);
//     stroke_to(brush, &sf, 4194164.5, 4194134.0);
//     stroke_to(brush, &sf, 4194137.5, 4194154.0);
//     stroke_to(brush, &sf, 4194118.5, 4194177.0);
//     stroke_to(brush, &sf, 4194102.5, 4194209.0);
//     stroke_to(brush, &sf, 4194081.5, 4194250.0);
//     stroke_to(brush, &sf, 4194064.5, 4194302.0);
//     stroke_to(brush, &sf, 4194050.5, 4194362.0);
//     stroke_to(brush, &sf, 4194050.5, 4194434.0);
//     stroke_to(brush, &sf, 4194050.5, 4194484.0);
//     stroke_to(brush, &sf, 4194053.5, 4194514.0);
//     stroke_to(brush, &sf, 4194060.5, 4194541.0);
//     stroke_to(brush, &sf, 4194069.5, 4194549.0);
//     stroke_to(brush, &sf, 4194080.5, 4194549.0);
//     stroke_to(brush, &sf, 4194099.5, 4194547.0);
//     stroke_to(brush, &sf, 4194141.5, 4194535.0);
//     stroke_to(brush, &sf, 4194188.5, 4194509.0);
//     stroke_to(brush, &sf, 4194253.5, 4194455.0);
    stroke_to(brush, &sf, 4194316.5, 4194407.0);

    mypaint_brush_unref(brush);
}

I'm implementing infinite canvas using grid index. All pixels are within same coordinate system. And map to tiles in draw_dab/get_color. So the coordinates may be relatively large. What would be a safe range for pixel coordinates?