Reland "Fold analytic clip FPs into GrReducedClip"

This is a reland of 4355b26b359d5f2597a10012e7eb11fb3a1f025b
Original change's description:
> Fold analytic clip FPs into GrReducedClip
>
> Perf result on Pixel phone (sorted by impact):
>
>   GEOMEAN                              7.44 -> 6.92 ms   [ 93%]
>
>   keymobi_cnn_com.skp                  3.55 -> 3.59 ms   [101%]
>   keymobi_theverge_com.skp             4.08 -> 4.13 ms   [101%]
>   desk_skbug6850autoscroll.skp         1.21 -> 1.22 ms   [101%]
>   ...
>   top25desk_weather_com.skp            14.2 -> 11.5 ms   [ 81%]
>   keymobi_androidpolice_com_2012_.skp  3.84 -> 2.95 ms   [ 77%]
>   keymobi_shop_mobileweb_ebay_com.skp  2.94 -> 2.26 ms   [ 77%]
>   keymobi_boingboing_net.skp           3.08 -> 2.24 ms   [ 73%]
>   desk_jsfiddlebigcar.skp              1.90 -> 1.25 ms   [ 66%]
>   keymobi_m_youtube_com_watch_v_9.skp  13.5 -> 8.84 ms   [ 65%]
>   keymobi_sfgate_com_.skp              8.55 -> 5.55 ms   [ 65%]
>   keymobi_blogger.skp                  4.01 -> 2.60 ms   [ 65%]
>
> Cleaner code, improved skps, slightly better geometric mean time.
>
> Pixel C is mostly unaffected, presumably because it uses window
> rectangles.
>
> Bug: skia:7190
> Change-Id: Ia93f68b2f971ea66b3ab19dc73557ea602932a92
> Reviewed-on: https://skia-review.googlesource.com/67424
> Commit-Queue: Chris Dalton <csmartdalton@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com

Bug: skia:7190
Change-Id: I92f1ed21b6292feb3209fcbd1725487784d420da
Reviewed-on: https://skia-review.googlesource.com/72562
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>

1 files changed, 33 insertions, 13 deletions

diff --git a/src/gpu/GrReducedClip.h b/src/gpu/GrReducedClip.h
index 0746439ba3..3ad2ab9971 100644
--- a/src/gpu/GrReducedClip.h
+++ b/src/gpu/GrReducedClip.h
@@ -8,6 +8,7 @@
 #ifndef GrReducedClip_DEFINED
 #define GrReducedClip_DEFINED
 
+#include "GrFragmentProcessor.h"
 #include "GrWindowRectangles.h"
 #include "SkClipStack.h"
 #include "SkTLList.h"
@@ -24,7 +25,8 @@ public:
     using Element = SkClipStack::Element;
     using ElementList = SkTLList<SkClipStack::Element, 16>;
 
-    GrReducedClip(const SkClipStack&, const SkRect& queryBounds, int maxWindowRectangles = 0);
+    GrReducedClip(const SkClipStack&, const SkRect& queryBounds,
+                  int maxWindowRectangles = 0, int maxAnalyticFPs = 0);
 
     /**
      * If hasScissor() is true, the clip mask is not valid outside this rect and the caller must
@@ -48,6 +50,13 @@ public:
      */
     const GrWindowRectangles& windowRectangles() const { return fWindowRects; }
 
+    int numAnalyticFPs() const { return fAnalyticFPs.count(); }
+
+    std::unique_ptr<GrFragmentProcessor> detachAnalyticFPs() {
+        SkDEBUGCODE(for (const auto& fp : fAnalyticFPs) { SkASSERT(fp); })
+        return GrFragmentProcessor::RunInSeries(fAnalyticFPs.begin(), fAnalyticFPs.count());
+    }
+
     /**
      * An ordered list of clip elements that could not be skipped or implemented by other means. If
      * nonempty, the caller must create an alpha and/or stencil mask for these elements and apply it
@@ -81,7 +90,7 @@ public:
     bool drawStencilClipMask(GrContext*, GrRenderTargetContext*) const;
 
 private:
-    void walkStack(const SkClipStack&, const SkRect& queryBounds, int maxWindowRectangles);
+    void walkStack(const SkClipStack&, const SkRect& queryBounds);
 
     enum class ClipResult {
         kNotClipped,
@@ -91,24 +100,35 @@ private:
 
     // Clips the the given element's interior out of the final clip.
     // NOTE: do not call for elements followed by ops that can grow the clip.
-    ClipResult clipInsideElement(const Element* element);
+    ClipResult clipInsideElement(const Element*);
 
     // Clips the the given element's exterior out of the final clip.
     // NOTE: do not call for elements followed by ops that can grow the clip.
-    ClipResult clipOutsideElement(const Element* element, int maxWindowRectangles);
+    ClipResult clipOutsideElement(const Element*);
 
     void addWindowRectangle(const SkRect& elementInteriorRect, bool elementIsAA);
+
+    enum class Invert : bool {
+        kNo,
+        kYes
+    };
+
+    template<typename T> ClipResult addAnalyticFP(const T& deviceSpaceShape, Invert, bool aa);
+
     void makeEmpty();
 
-    SkIRect              fScissor;
-    bool                 fHasScissor;
-    SkRect               fAAClipRect;
-    uint32_t             fAAClipRectGenID; // GenID the mask will have if includes the AA clip rect.
-    GrWindowRectangles   fWindowRects;
-    ElementList          fMaskElements;
-    uint32_t             fMaskGenID;
-    bool                 fMaskRequiresAA;
-    InitialState         fInitialState;
+    const int fMaxWindowRectangles;
+    const int fMaxAnalyticFPs;
+    SkIRect fScissor;
+    bool fHasScissor;
+    SkRect fAAClipRect;
+    uint32_t fAAClipRectGenID; // GenID the mask will have if includes the AA clip rect.
+    GrWindowRectangles fWindowRects;
+    SkSTArray<4, std::unique_ptr<GrFragmentProcessor>> fAnalyticFPs;
+    ElementList fMaskElements;
+    uint32_t fMaskGenID;
+    bool fMaskRequiresAA;
+    InitialState fInitialState;
 };
 
 #endif