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/BUILD.gn b/BUILD.gn
index d837d1d..08b94cd 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -678,6 +678,7 @@
sources += skia_utils_sources
sources += skia_xps_sources
sources += [
+ "src/android/SkAndroidFrameworkUtils.cpp",
"src/android/SkBitmapRegionCodec.cpp",
"src/android/SkBitmapRegionDecoder.cpp",
"src/codec/SkAndroidCodec.cpp",
diff --git a/include/android/SkAndroidFrameworkUtils.h b/include/android/SkAndroidFrameworkUtils.h
new file mode 100644
index 0000000..0457d03
--- /dev/null
+++ b/include/android/SkAndroidFrameworkUtils.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkAndroidFrameworkUtils_DEFINED
+#define SkAndroidFrameworkUtils_DEFINED
+
+#include "SkTypes.h"
+
+#ifdef SK_BUILD_FOR_ANDROID
+
+class SkCanvas;
+
+/**
+ * SkAndroidFrameworkUtils expose private APIs used only by Android framework.
+ */
+class SkAndroidFrameworkUtils {
+public:
+
+#if SK_SUPPORT_GPU
+ /**
+ * clipWithStencil draws the current clip into a stencil buffer with reference value and mask
+ * set to 0x1. This function works only on a GPU canvas.
+ *
+ * @param canvas A GPU canvas that has a non-empty clip.
+ *
+ * @return true on success or false if clip is empty or not a GPU canvas.
+ */
+ static bool clipWithStencil(SkCanvas* canvas);
+#endif //SK_SUPPORT_GPU
+};
+
+#endif // SK_BUILD_FOR_ANDROID
+
+#endif // SkAndroidFrameworkUtils_DEFINED
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h
index 8fbca71..c4cb175 100644
--- a/include/core/SkCanvas.h
+++ b/include/core/SkCanvas.h
@@ -17,6 +17,7 @@
class GrContext;
class GrRenderTargetContext;
+class SkAndroidFrameworkUtils;
class SkBaseDevice;
class SkBitmap;
class SkClipStack;
@@ -1457,6 +1458,7 @@
void checkForDeferredSave();
void internalSetMatrix(const SkMatrix&);
+ friend class SkAndroidFrameworkUtils;
friend class SkDrawIter; // needs setupDrawForLayerDevice()
friend class AutoDrawLooper;
friend class SkDebugCanvas; // needs experimental fAllowSimplifyClip
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
+
diff --git a/src/core/SkDevice.h b/src/core/SkDevice.h
index c0aef8e..c531b1e 100644
--- a/src/core/SkDevice.h
+++ b/src/core/SkDevice.h
@@ -13,6 +13,7 @@
#include "SkColor.h"
#include "SkSurfaceProps.h"
+class SkAndroidFrameworkUtils;
class SkBitmap;
class SkDrawFilter;
struct SkDrawShadowRec;
@@ -346,6 +347,7 @@
static void LogDrawScaleFactor(const SkMatrix&, SkFilterQuality);
private:
+ friend class SkAndroidFrameworkUtils;
friend class SkCanvas;
friend struct DeviceCM; //for setMatrixClip
friend class SkDraw;
diff --git a/src/gpu/GrRenderTargetContext.cpp b/src/gpu/GrRenderTargetContext.cpp
index d54b084..cc82408 100644
--- a/src/gpu/GrRenderTargetContext.cpp
+++ b/src/gpu/GrRenderTargetContext.cpp
@@ -1277,7 +1277,8 @@
GrAA aa,
const SkMatrix& viewMatrix,
const SkRegion& region,
- const GrStyle& style) {
+ const GrStyle& style,
+ const GrUserStencilSettings* ss) {
ASSERT_SINGLE_OWNER
RETURN_IF_ABANDONED
SkDEBUGCODE(this->validate();)
@@ -1300,7 +1301,8 @@
}
GrAAType aaType = this->chooseAAType(GrAA::kNo, GrAllowMixedSamples::kNo);
- std::unique_ptr<GrDrawOp> op = GrRegionOp::Make(std::move(paint), viewMatrix, region, aaType);
+ std::unique_ptr<GrDrawOp> op = GrRegionOp::Make(std::move(paint), viewMatrix, region, aaType,
+ ss);
this->addDrawOp(clip, std::move(op));
}
diff --git a/src/gpu/GrRenderTargetContext.h b/src/gpu/GrRenderTargetContext.h
index 964d9e9..d7d2b9b 100644
--- a/src/gpu/GrRenderTargetContext.h
+++ b/src/gpu/GrRenderTargetContext.h
@@ -246,7 +246,8 @@
GrAA aa,
const SkMatrix& viewMatrix,
const SkRegion& region,
- const GrStyle& style);
+ const GrStyle& style,
+ const GrUserStencilSettings* ss = nullptr);
/**
* Draws an oval.
diff --git a/src/gpu/ops/GrRegionOp.cpp b/src/gpu/ops/GrRegionOp.cpp
index f059ac7..7e2879c 100644
--- a/src/gpu/ops/GrRegionOp.cpp
+++ b/src/gpu/ops/GrRegionOp.cpp
@@ -169,11 +169,11 @@
namespace GrRegionOp {
std::unique_ptr<GrDrawOp> Make(GrPaint&& paint, const SkMatrix& viewMatrix, const SkRegion& region,
- GrAAType aaType) {
+ GrAAType aaType, const GrUserStencilSettings* stencilSettings) {
if (aaType != GrAAType::kNone && aaType != GrAAType::kMSAA) {
return nullptr;
}
- return RegionOp::Make(std::move(paint), viewMatrix, region, aaType);
+ return RegionOp::Make(std::move(paint), viewMatrix, region, aaType, stencilSettings);
}
}
diff --git a/src/gpu/ops/GrRegionOp.h b/src/gpu/ops/GrRegionOp.h
index bfdad71..b74f78c 100644
--- a/src/gpu/ops/GrRegionOp.h
+++ b/src/gpu/ops/GrRegionOp.h
@@ -14,10 +14,12 @@
class SkMatrix;
class SkRegion;
class GrPaint;
+struct GrUserStencilSettings;
namespace GrRegionOp {
/** GrAAType must be kNone or kMSAA. */
-std::unique_ptr<GrDrawOp> Make(GrPaint&&, const SkMatrix& viewMatrix, const SkRegion&, GrAAType);
+std::unique_ptr<GrDrawOp> Make(GrPaint&&, const SkMatrix& viewMatrix, const SkRegion&, GrAAType,
+ const GrUserStencilSettings* stencilSettings = nullptr);
}
#endif