Make xformer class for SkCSXCanvas, use for draw loopers

Fixes draw looper gms in gbr-8888 config.

Bug: skia:
Change-Id: I0a9306cc0523c82f2ad9516752d79c1d86b1e295
Reviewed-on: https://skia-review.googlesource.com/10644
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/effects/SkLayerDrawLooper.cpp b/src/effects/SkLayerDrawLooper.cpp
index a20638c005..feeea66a35 100644
--- a/src/effects/SkLayerDrawLooper.cpp
+++ b/src/effects/SkLayerDrawLooper.cpp
@@ -8,6 +8,7 @@
 #include "SkBlurDrawLooper.h"
 #include "SkBlurMaskFilter.h"
 #include "SkCanvas.h"
+#include "SkColorSpaceXformer.h"
 #include "SkColor.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
@@ -206,6 +207,37 @@ bool SkLayerDrawLooper::asABlurShadow(BlurShadowRec* bsRec) const {
     return true;
 }
 
+sk_sp<SkDrawLooper> SkLayerDrawLooper::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
+    if (!fCount) {
+        return sk_ref_sp(const_cast<SkLayerDrawLooper*>(this));
+    }
+
+    auto looper = sk_sp<SkLayerDrawLooper>(new SkLayerDrawLooper());
+    looper->fCount = fCount;
+
+    Rec* oldRec = fRecs;
+    Rec* newTopRec = new Rec();
+    newTopRec->fInfo = oldRec->fInfo;
+    newTopRec->fPaint = xformer->apply(oldRec->fPaint);
+    newTopRec->fNext = nullptr;
+
+    Rec* prevNewRec = newTopRec;
+    oldRec = oldRec->fNext;
+    while (oldRec) {
+        Rec* newRec = new Rec();
+        newRec->fInfo = oldRec->fInfo;
+        newRec->fPaint = xformer->apply(oldRec->fPaint);
+        newRec->fNext = nullptr;
+        prevNewRec->fNext = newRec;
+
+        prevNewRec = newRec;
+        oldRec = oldRec->fNext;
+    }
+
+    looper->fRecs = newTopRec;
+    return std::move(looper);
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 void SkLayerDrawLooper::flatten(SkWriteBuffer& buffer) const {