Restore support for multisample locations
Bug: skia:
Change-Id: I971455867e54d431cc1094fca041f773f78748ee
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/196218
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrSamplePatternDictionary.cpp b/src/gpu/GrSamplePatternDictionary.cpp
new file mode 100644
index 0000000..453ed45
--- /dev/null
+++ b/src/gpu/GrSamplePatternDictionary.cpp
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2019 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrSamplePatternDictionary.h"
+
+bool GrSamplePatternDictionary::LessThan::operator()(
+ const SkTArray<SkPoint>& a, const SkTArray<SkPoint>& b) const {
+ if (a.count() != b.count()) {
+ return a.count() < b.count();
+ }
+ for (int i = 0; i < a.count(); ++i) {
+ // This doesn't have geometric meaning. We just need to define an ordering for std::map.
+ if (a[i].x() != b[i].x()) {
+ return a[i].x() < b[i].x();
+ }
+ if (a[i].y() != b[i].y()) {
+ return a[i].y() < b[i].y();
+ }
+ }
+ return false; // Both sample patterns are equal, therefore, "a < b" is false.
+}
+
+int GrSamplePatternDictionary::findOrAssignSamplePatternKey(
+ const SkTArray<SkPoint>& sampleLocations) {
+ if (std::numeric_limits<int>::max() == fSampleLocationsArray.count()) {
+ return 0;
+ }
+ const auto& insertResult = fSamplePatternKeyMap.insert(
+ {sampleLocations, fSampleLocationsArray.count()});
+ if (insertResult.second) {
+ // This means the "insert" call did not find the pattern in the key map already, and
+ // therefore an actual insertion took place. (We don't expect to see many unique sample
+ // patterns.)
+ const SkTArray<SkPoint>& sampleLocations = insertResult.first->first;
+ fSampleLocationsArray.push_back(&sampleLocations);
+ }
+ return insertResult.first->second; // Return the new sample pattern key.
+}