<div dir="ltr">Any ideas? Anyone? </div><div class="gmail_extra"> <div class="gmail_quote">On Tue, Aug 6, 2013 at 5:34 PM, Bobby Salazar <<a href="mailto:bobby8934@gmail.com" target="_blank">bobby8934@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I am testing some code on iOS and have run into a rendering problem using Quartz surfaces that does not happen by merely switching the surface out to an image surface. Here is the code: void TestRadialRender() { cairo_surface_t* pSurface; cairo_t* pContext; cairo_matrix_t Matrix; // Setup surface //pSurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 640, 1136); pSurface = cairo_quartz_surface_create(CAIRO_FORMAT_ARGB32, 640, 1136); pContext = cairo_create(pSurface); // Setup matrix cairo_matrix_init(&Matrix, 3.6, 0.0, 0.0, 1.35, 568, 66); cairo_set_matrix(pContext, &Matrix); // Setup path cairo_new_path(pContext); double cx = -45.84799; double cy = 7.394; double rx = 3; double ry = 3; cairo_move_to (pContext, cx + rx, cy); cairo_curve_to (pContext, cx + rx, cy + ry * 0.5522847498, cx + rx * 0.5522847498, cy + ry, cx, cy + ry); cairo_curve_to (pContext, cx - rx * 0.5522847498, cy + ry, cx - rx, cy + ry * 0.5522847498, cx - rx, cy); cairo_curve_to (pContext, cx - rx, cy - ry * 0.5522847498, cx - rx * 0.5522847498, cy - ry, cx, cy - ry); cairo_curve_to (pContext, cx + rx * 0.5522847498, cy - ry, cx + rx, cy - ry * 0.5522847498, cx + rx, cy); cairo_close_path (pContext); // Setup pattern cairo_pattern_t* pat; pat = cairo_pattern_create_radial(-45.84799, 7.394, 0, -45.84799, 7.394, 3); cairo_pattern_set_extend(pat, CAIRO_EXTEND_REFLECT); // Setup brush color cairo_pattern_add_color_stop_rgba(pat, 0, 0.00, 0.00, 1.00, 0.125); // Setup color stops cairo_pattern_add_color_stop_rgba(pat, 0.0000, 0.54, 0.55, 0.56, 1.00); cairo_pattern_add_color_stop_rgba(pat, 0.1272, 0.67, 0.68, 0.69, 1.00); cairo_pattern_add_color_stop_rgba(pat, 0.2750, 0.78, 0.79, 0.80, 1.00); cairo_pattern_add_color_stop_rgba(pat, 0.4307, 0.88, 0.88, 0.89, 0.50); cairo_pattern_add_color_stop_rgba(pat, 0.5955, 0.95, 0.95, 0.95, 0.25); cairo_pattern_add_color_stop_rgba(pat, 0.7757, 0.98, 0.98, 0.98, 0.125); cairo_pattern_add_color_stop_rgba(pat, 1.0000, 1.00, 1.00, 1.00, 0.00); // Render it cairo_set_source(pContext, pat); //// START TIMER //// cairo_fill_preserve(pContext); //// END TIMER //// cairo_pattern_destroy(pat); // Cleanup cairo_surface_destroy(pSurface); cairo_destroy(pContext); } In that test function above, if the code is using cairo_quartz_surface_create() then the call to cairo_fill_preserve() takes around 600ms to complete. If you comment out cairo_quartz_surface_create() and use cairo_image_surface_create() instead, then the call to cairo_fill_preserve() takes around 2ms to complete. In the case where it renders really slow, it is usually stuck down in the Pixman code calculating radial gradient information. However, I would expect that it uses the same Pixman code for the image surface as it does for the Quartz surface type. Does anyone have any ideas what could be going wrong here? This testing was done on an iPod touch 5th generation device (ARM based processor) using Cairo v1.8.0 and Pixman v0.24.0. I realize this version of Cairo may be a little old now, is anyone able to test this function using a newer build to see if it may have already been fixed? As I type this I realize it may be helpful to get numbers on an x86 processor. I ran the same function under the iPhone simulator on a Core i7 MacBook Pro and it produced 74ms for the Quartz surface and less than 1 millisecond for the image surface. As you can see, the Quartz surface is still an order of magnitude slower. Any ideas? </blockquote></div> </div>