Improve usage of window rectangles

* Skips non-AA diff rect elements and replaces them with window
  rectangles.
* Places window rectangles in the interiors of antialiased diff rects.
* Arranges two overlapping window rectangles in a plus shape inside of
  diff rounded rects.
* Enables window rectangles when clearing and generating clip masks.

GTX 960 perf result (with vs. without window rectangles):

                              glinst4                msaa16                 gpu
keymobi_pinterest.skp         0.48 -> 0.17 [ 35%]    2.77 -> 1.49 [ 54%]    0.22 -> 0.16 [ 70%]
keymobi_digg_com.skp          0.42 -> 0.23 [ 55%]    2.34 -> 1.08 [ 46%]    0.25 -> 0.21 [ 83%]
desk_jsfiddlebigcar.skp       0.28 -> 0.16 [ 59%]    1.70 -> 0.96 [ 57%]    0.19 -> 0.14 [ 70%]
top25desk_wordpress.skp       0.45 -> 0.18 [ 40%]    2.78 -> 1.53 [ 55%]    0.21 -> 0.19 [ 94%]
top25desk_weather_com.skp     2.01 -> 1.93 [ 96%]    23.5 -> 2.54 [ 11%]    1.90 -> 1.68 [ 88%]
keymobi_blogger.skp           0.57 -> 0.37 [ 65%]    2.87 -> 1.54 [ 54%]    0.43 -> 0.33 [ 77%]
keymobi_linkedin.skp          0.32 -> 0.17 [ 51%]    1.93 -> 1.04 [ 54%]    0.17 -> 0.15 [ 91%]
keymobi_bing_com_search_...   0.29 -> 0.25 [ 83%]    1.85 -> 1.23 [ 66%]    0.50 -> 0.24 [ 48%]
keymobi_theverge_com_201...   1.00 -> 0.67 [ 68%]    9.46 -> 3.84 [ 41%]    0.72 -> 0.65 [ 90%]
keymobi_sfgate_com_.skp       1.56 -> 1.13 [ 72%]    4.49 -> 2.86 [ 64%]    1.54 -> 1.11 [ 72%]
...
GEOMEAN (All 79 blink skps)   1.04 -> 0.90 [ 86%]    4.22 -> 2.81 [ 67%]    0.95 -> 0.89 [ 94%]

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2289363005

Committed: https://skia.googlesource.com/skia/+/db42be9a326c747ff92ed1da8c3536c5b3e8e22b
Review-Url: https://codereview.chromium.org/2289363005

1 files changed, 34 insertions, 10 deletions

diff --git a/src/gpu/GrFixedClip.cpp b/src/gpu/GrFixedClip.cpp
index ebdd49bbf8..7385028baf 100644
--- a/src/gpu/GrFixedClip.cpp
+++ b/src/gpu/GrFixedClip.cpp
@@ -10,25 +10,45 @@
 #include "GrAppliedClip.h"
 #include "GrDrawContext.h"
 
-void GrFixedClip::getConservativeBounds(int width, int height, SkIRect* devResult,
-                                        bool* isIntersectionOfRects) const {
-    devResult->setXYWH(0, 0, width, height);
+bool GrFixedClip::quickContains(const SkRect& rect) const {
+    if (fWindowRectsState.enabled()) {
+        return false;
+    }
+    return !fScissorState.enabled() || GrClip::IsInsideClip(fScissorState.rect(), rect);
+}
+
+void GrFixedClip::getConservativeBounds(int w, int h, SkIRect* devResult, bool* iior) const {
+    devResult->setXYWH(0, 0, w, h);
     if (fScissorState.enabled()) {
         if (!devResult->intersect(fScissorState.rect())) {
             devResult->setEmpty();
         }
     }
-    if (isIntersectionOfRects) {
-        *isIntersectionOfRects = true;
+    if (iior) {
+        *iior = true;
     }
 }
 
-bool GrFixedClip::apply(GrContext*, GrDrawContext* drawContext, bool isHWAntiAlias,
-                        bool hasUserStencilSettings, GrAppliedClip* out) const {
+bool GrFixedClip::isRRect(const SkRect& rtBounds, SkRRect* rr, bool* aa) const {
+    if (fWindowRectsState.enabled()) {
+        return false;
+    }
     if (fScissorState.enabled()) {
-        SkIRect tightScissor;
-        if (!tightScissor.intersect(fScissorState.rect(),
-                                    SkIRect::MakeWH(drawContext->width(), drawContext->height()))) {
+        SkRect rect = SkRect::Make(fScissorState.rect());
+        if (!rect.intersects(rtBounds)) {
+            return false;
+        }
+        rr->setRect(rect);
+        *aa = false;
+        return true;
+    }
+    return false;
+};
+
+bool GrFixedClip::apply(GrContext*, GrDrawContext* dc, bool, bool, GrAppliedClip* out) const {
+    if (fScissorState.enabled()) {
+        SkIRect tightScissor = SkIRect::MakeWH(dc->width(), dc->height());
+        if (!tightScissor.intersect(fScissorState.rect())) {
             return false;
         }
         if (IsOutsideClip(tightScissor, out->clippedDrawBounds())) {
@@ -39,6 +59,10 @@ bool GrFixedClip::apply(GrContext*, GrDrawContext* drawContext, bool isHWAntiAli
         }
     }
 
+    if (fWindowRectsState.enabled()) {
+        out->addWindowRectangles(fWindowRectsState);
+    }
+
     return true;
 }