Use CPU rendering by default and rename env var with the number of threads

Author: magomez

Source/WebCore/platform/graphics/skia/SkiaPaintingEngine.cpp

@@ -307,7 +307,7 @@ unsigned SkiaPaintingEngine::numberOfCPUPaintingThreads()
     std::call_once(onceFlag, [] {
         numberOfThreads = std::max(1, std::min(8, WTF::numberOfProcessorCores() / 2)); // By default, use half the CPU cores, capped at 8.
 
-        if (const char* envString = getenv("WEBKIT_SKIA_CPU_PAINTING_THREADS")) {
+        if (const char* envString = getenv("WEBKIT_NICOSIA_PAINTING_THREADS")) {
             auto newValue = parseInteger<unsigned>(StringView::fromLatin1(envString));
             if (newValue && *newValue <= 8)
                 numberOfThreads = *newValue;

Source/WebKit/WebProcess/glib/WebProcessGLib.cpp

@@ -173,7 +173,9 @@ void WebProcess::platformInitializeWebProcess(WebProcessCreationParameters& para
 {
 #if USE(SKIA)
     const char* enableCPURendering = getenv("WEBKIT_SKIA_ENABLE_CPU_RENDERING");
-    if (enableCPURendering && strcmp(enableCPURendering, "0"))
+    if (enableCPURendering && !strcmp(enableCPURendering, "0"))
+        ProcessCapabilities::setCanUseAcceleratedBuffers(true);
+    else
         ProcessCapabilities::setCanUseAcceleratedBuffers(false);
 #endif