Cherry-pick 270586@main (135e0e4). https://bugs.webkit.org/show_bug.cgi?id=264605

    [Cairo] Use CAIRO_FILTER_BILINEAR for low interpolation quality
    https://bugs.webkit.org/show_bug.cgi?id=264605

    Reviewed by Fujii Hironori.

    We currently use CAIRO_FILTER_FAST which is the same as no
    interpolation. Bilinear provides reasonable quality with good enough
    performance. Also change the default interpolation quality of the canvas
    to Low (like CG does) which drastically improves the performance of
    downscaling high resolution images in the canvas with a reasonable
    output. See for example https://vsynctester.com

    * Source/WebCore/html/CanvasBase.cpp:
    * Source/WebCore/platform/graphics/cairo/CairoOperations.cpp:
    (WebCore::Cairo::drawSurface):

    Canonical link: https://commits.webkit.org/270586@main

Author: carlosgcampos

Source/WebCore/html/CanvasBase.cpp

@@ -43,13 +43,7 @@ static std::atomic<size_t> s_activePixelMemory { 0 };
 
 namespace WebCore {
 
-#if USE(CG)
-// FIXME: It seems strange that the default quality is not the one that is literally named "default".
-// Should fix names to make this easier to understand, or write an excellent comment here explaining why not.
 const InterpolationQuality defaultInterpolationQuality = InterpolationQuality::Low;
-#else
-const InterpolationQuality defaultInterpolationQuality = InterpolationQuality::Default;
-#endif
 
 CanvasBase::CanvasBase(IntSize size)
     : m_size(size)

Source/WebCore/platform/graphics/cairo/CairoOperations.cpp

@@ -936,9 +936,11 @@ void drawSurface(GraphicsContextCairo& platformContext, cairo_surface_t* surface
 
     switch (imageInterpolationQuality) {
     case InterpolationQuality::DoNotInterpolate:
-    case InterpolationQuality::Low:
         cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_FAST);
         break;
+    case InterpolationQuality::Low:
+        cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_BILINEAR);
+        break;
     case InterpolationQuality::Medium:
     case InterpolationQuality::Default:
         cairo_pattern_set_filter(pattern.get(), CAIRO_FILTER_GOOD);