René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":" wxwidgets new driver very very slow ","articleBody":"I'm expericencing a very annoying slowness of the new wxwidgets driver compared to its 'old' ancestor.\r\nThe procedure to test it is easy:\r\n- compile plplot 5.15 with -DBUILD_TEST=ON and alternatively with -DOLD_WXWIDGETS=ON and -DOLD_WXWIDGETS=OFF. In both cases install and compare the time it takes to plot example c++/x11\r\n- the time is ~10 larger with the new driver\r\n- this factor goes as square of the size of the plot window (try with -geometry 3000x30000) wich almost never succeeds to plot with the new driver, and ~3 seconds for the old.\r\n\r\nby comparison, X11 is instantaneous.\r\n\r\nMy configuration: Mageia 8 , wxwidgets 3.1 (wxgtk) , gcc 10.3.0 , plplot 5.15.0\r\n\r\nThe culprit is the Clipper object used in DrawLine.\r\nmore precisely, because it calls wxRegion() which somehow calls gdk_cairo_region_create_from_surface() each time, this is terribly long.\r\n\r\nmaking wxRect wxPLDevice::GetClipRegion() a wxRect and not a wxRegion, for example with:\r\nreturn wxRect(cpoints[0],cpoints[2]);\r\n//instead of return Region( 4, cpoints );\r\n(and the declarations,etc)\r\nis sufficient to get a reasonable speed.\r\n\r\nReasonable because the old driver is still 6 times faster.\r\n","author":{"url":"https://github.com/GillesDuvert","@type":"Person","name":"GillesDuvert"},"datePublished":"2023-09-05T14:37:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/9/PLplot/issues/9"}