add pathops tight bounds; conform path ops' gyp to unit tests

Implement path tight bounds using path ops machinery. This is not
as efficient as it could be; for instance, internally, it creates
a path ops structure more suited to intersection. If this shows
up as a performance bottleneck, it could be improved.

Fix path ops gyp files, which have fallen out of sync with other
tests.

R=mtklein@google.com, bsalomon@google.com
TBR=mtklein
BUG=skia:1712

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/348343002

1 files changed, 33 insertions, 0 deletions

diff --git a/src/pathops/SkPathOpsTightBounds.cpp b/src/pathops/SkPathOpsTightBounds.cpp
new file mode 100644
index 0000000000..0f63f396e7
--- /dev/null
+++ b/src/pathops/SkPathOpsTightBounds.cpp
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkOpEdgeBuilder.h"
+#include "SkPathOpsCommon.h"
+
+bool TightBounds(const SkPath& path, SkRect* result) {
+    // turn path into list of segments
+    SkTArray<SkOpContour> contours;
+    SkOpEdgeBuilder builder(path, contours);
+    if (!builder.finish()) {
+        return false;
+    }
+    SkTArray<SkOpContour*, true> contourList;
+    MakeContourList(contours, contourList, false, false);
+    SkOpContour** currentPtr = contourList.begin();
+    result->setEmpty();
+    if (!currentPtr) {
+        return true;
+    }
+    SkOpContour** listEnd = contourList.end();
+    SkOpContour* current = *currentPtr++;
+    SkPathOpsBounds bounds = current->bounds();
+    while (currentPtr != listEnd) {
+        current = *currentPtr++;
+        bounds.add(current->bounds());
+    }
+    *result = bounds;
+    return true;
+}