Add a private API for writing the clip to the stencil
Add a private API used by Android framework, which writes the clip
into a stencil buffer. This is used by HWUI to clip the WebView.
Bug: 31489986
Change-Id: I94515f1539acd9d069c8aceb3300577feed9c94f
Reviewed-on: https://skia-review.googlesource.com/29521
Commit-Queue: Stan Iliev <stani@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
diff --git a/src/android/SkAndroidFrameworkUtils.cpp b/src/android/SkAndroidFrameworkUtils.cpp
new file mode 100644
index 0000000..5fbc2ca
--- /dev/null
+++ b/src/android/SkAndroidFrameworkUtils.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkAndroidFrameworkUtils.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+
+#if SK_SUPPORT_GPU
+#include "GrStyle.h"
+#include "GrClip.h"
+#include "GrRenderTargetContext.h"
+#include "GrUserStencilSettings.h"
+#include "effects/GrDisableColorXP.h"
+#endif //SK_SUPPORT_GPU
+
+#ifdef SK_BUILD_FOR_ANDROID
+
+#if SK_SUPPORT_GPU
+bool SkAndroidFrameworkUtils::clipWithStencil(SkCanvas* canvas) {
+ SkRegion clipRegion;
+ canvas->temporary_internal_getRgnClip(&clipRegion);
+ if (clipRegion.isEmpty()) {
+ return false;
+ }
+ SkBaseDevice* device = canvas->getDevice();
+ if (!device) {
+ return false;
+ }
+ GrRenderTargetContext* rtc = device->accessRenderTargetContext();
+ if (!rtc) {
+ return false;
+ }
+ GrPaint grPaint;
+ grPaint.setXPFactory(GrDisableColorXPFactory::Get());
+ GrNoClip noClip;
+ static constexpr GrUserStencilSettings kDrawToStencil(
+ GrUserStencilSettings::StaticInit<
+ 0x1,
+ GrUserStencilTest::kAlways,
+ 0x1,
+ GrUserStencilOp::kReplace,
+ GrUserStencilOp::kReplace,
+ 0x1>()
+ );
+ rtc->drawRegion(noClip, std::move(grPaint), GrAA::kNo, SkMatrix::I(), clipRegion,
+ GrStyle::SimpleFill(), &kDrawToStencil);
+ return true;
+}
+#endif //SK_SUPPORT_GPU
+
+#endif // SK_BUILD_FOR_ANDROID
+