Add unit repeat tiler.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1837893004

Review URL: https://codereview.chromium.org/1837893004

src/core/SkLinearBitmapPipeline.cpp

@@ -238,6 +238,12 @@ public:
             processor->breakIntoEdges(span);
         }
 
+        void repeatSpan(Span span, int32_t repeatCount) {
+            while (repeatCount --> 0) {
+                processor->pointSpan(span);
+            }
+        }
+
         BilerpTileStage* processor;
     };
 
@@ -364,13 +370,21 @@ static SkLinearBitmapPipeline::PointProcessorInterface* choose_tiler(
     SkShader::TileMode xMode,
     SkShader::TileMode yMode,
     SkFilterQuality filterQuality,
-    SkLinearBitmapPipeline::TileStage* tileStage) {
+    SkScalar dx,
+    SkLinearBitmapPipeline::TileStage* tileStage)
+{
     switch (xMode) {
         case SkShader::kClamp_TileMode:
             choose_tiler_ymode<XClampStrategy>(yMode, filterQuality, dimensions, next, tileStage);
             break;
         case SkShader::kRepeat_TileMode:
-            choose_tiler_ymode<XRepeatStrategy>(yMode, filterQuality, dimensions, next, tileStage);
+            if (dx == 1.0f && filterQuality == kNone_SkFilterQuality) {
+                choose_tiler_ymode<XRepeatUnitScaleStrategy>(
+                    yMode, kNone_SkFilterQuality, dimensions, next, tileStage);
+            } else {
+                choose_tiler_ymode<XRepeatStrategy>(
+                    yMode, filterQuality, dimensions, next, tileStage);
+            }
             break;
         case SkShader::kMirror_TileMode:
             choose_tiler_ymode<XMirrorStrategy>(yMode, filterQuality, dimensions, next, tileStage);
@@ -588,6 +602,8 @@ SkLinearBitmapPipeline::SkLinearBitmapPipeline(
         }
     }
 
+    SkScalar dx = adjustedInverse.getScaleX();
+
     // If it is an index 8 color type, the sampler converts to unpremul for better fidelity.
     SkAlphaType alphaType = srcImageInfo.alphaType();
     if (srcPixmap.colorType() == kIndex_8_SkColorType) {
@@ -600,7 +616,7 @@ SkLinearBitmapPipeline::SkLinearBitmapPipeline(
     auto samplerStage   = choose_pixel_sampler(placementStage,
                                                filterQuality, srcPixmap, &fSampleStage);
     auto tilerStage     = choose_tiler(samplerStage,
-                                       dimensions, xTile, yTile, filterQuality, &fTiler);
+                                       dimensions, xTile, yTile, filterQuality, dx, &fTiler);
     fFirstStage         = choose_matrix(tilerStage, adjustedInverse, &fMatrixStage);
 }
 

src/core/SkLinearBitmapPipeline_tile.h

@@ -234,6 +234,79 @@ private:
     const Sk4s     fXsInvMax;
 };
 
+class XRepeatUnitScaleStrategy {
+public:
+    XRepeatUnitScaleStrategy(int32_t max)
+        : fXMax{SkScalar(max)}
+        , fXsMax{SkScalar(max)}
+        , fXsCap{SkScalar(nextafterf(SkScalar(max), 0.0f))}
+        , fXsInvMax{1.0f / SkScalar(max)} { }
+
+    void tileXPoints(Sk4s* xs) {
+        Sk4s divX = *xs * fXsInvMax;
+        Sk4s modX = *xs - divX.floor() * fXsMax;
+        *xs = Sk4s::Min(fXsCap, modX);
+        SkASSERT(0 <= (*xs)[0] && (*xs)[0] < fXMax);
+        SkASSERT(0 <= (*xs)[1] && (*xs)[1] < fXMax);
+        SkASSERT(0 <= (*xs)[2] && (*xs)[2] < fXMax);
+        SkASSERT(0 <= (*xs)[3] && (*xs)[3] < fXMax);
+    }
+
+    template<typename Next>
+    bool maybeProcessSpan(Span originalSpan, Next* next) {
+        SkASSERT(!originalSpan.isEmpty());
+        SkPoint start; SkScalar length; int count;
+        std::tie(start, length, count) = originalSpan;
+        // Make x and y in range on the tile.
+        SkScalar x = tile_mod(X(start), fXMax);
+        SkScalar y = Y(start);
+
+        // No need trying to go fast because the steps are larger than a tile or there is one point.
+        if (fXMax == 1 || count <= 1) {
+            return false;
+        }
+
+        // x should be on the tile.
+        SkASSERT(0.0f <= x && x < fXMax);
+        Span span({x, y}, length, count);
+
+        if (SkScalarFloorToScalar(x) != 0.0f) {
+            Span toDraw = span.breakAt(fXMax, 1.0f);
+            next->pointSpan(toDraw);
+            span.offset(-fXMax);
+        }
+
+        // All of the span could have been on the first tile. If so, then no work to do.
+        if (span.isEmpty()) return true;
+
+        // At this point the span should be aligned to zero.
+        SkASSERT(SkScalarFloorToScalar(span.startX()) == 0.0f);
+
+        SkScalar div = span.length() / fXMax;
+        int32_t repeatCount = SkScalarFloorToInt(div);
+        Span repeatableSpan{{0.0f, y}, fXMax - 1.0f, SkScalarFloorToInt(fXMax)};
+
+        // Repeat the center section.
+        next->repeatSpan(repeatableSpan, repeatCount);
+
+        // There may be some of the span left over.
+        span.breakAt(SkScalar(repeatCount) * fXMax, 1.0f);
+
+        // All on a single tile.
+        if (!span.isEmpty()) {
+            next->pointSpan(span);
+        }
+
+        return true;
+    }
+
+private:
+    const SkScalar fXMax;
+    const Sk4s     fXsMax;
+    const Sk4s     fXsCap;
+    const Sk4s     fXsInvMax;
+};
+
 class YRepeatStrategy {
 public:
     YRepeatStrategy(int32_t max)