<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div>cairo_surface_t * surfaceSrc = cairo_image_surface_create(CAIRO_FORMAT_RGB16_565, 917, 917);</div><div>cairo_surface_t * surfaceDst = cairo_image_surface_create(CAIRO_FORMAT_RGB16_565, 480, 800);</div><div>cairo_t * crDst = cairo_create(surfaceDst);</div><div><br></div><div>cairo_scale(cr, 2.0, 2.0);<br></div><div>cairo_set_source_surface(crDst, surfaceSrc, 0, 0);</div><div>cairo_paint(crDst);</div><div><br></div><div>when it runs on android os, the efficiency is very low. if use cairo_scale(cr, 1.0, 1.0) , no zoomratio, it runs <br></div><div>very fast. Why ? Anyone tell me? <br></div></div></body></html>