1 files changed, 113 insertions, 0 deletions
diff --git a/libs/hwui/pipeline/skia/GLFunctorDrawable.cpp b/libs/hwui/pipeline/skia/GLFunctorDrawable.cpp
new file mode 100644
index 000000000000..fb2134c51e22
--- /dev/null
+++ b/libs/hwui/pipeline/skia/GLFunctorDrawable.cpp
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "GLFunctorDrawable.h"
+#include "GlFunctorLifecycleListener.h"
+#include "RenderNode.h"
+#include "SkClipStack.h"
+#include <private/hwui/DrawGlInfo.h>
+#include <SkPath.h>
+#include <GrContext.h>
+
+namespace android {
+namespace uirenderer {
+namespace skiapipeline {
+
+GLFunctorDrawable::~GLFunctorDrawable() {
+    if(mListener.get() != nullptr) {
+        mListener->onGlFunctorReleased(mFunctor);
+    }
+}
+
+void GLFunctorDrawable::syncFunctor() const {
+    (*mFunctor)(DrawGlInfo::kModeSync, nullptr);
+}
+
+static void setScissor(int viewportHeight, const SkIRect& clip) {
+    SkASSERT(!clip.isEmpty());
+    // transform to Y-flipped GL space, and prevent negatives
+    GLint y = viewportHeight - clip.fBottom;
+    GLint height = (viewportHeight - clip.fTop) - y;
+    glScissor(clip.fLeft, y, clip.width(), height);
+}
+
+void GLFunctorDrawable::onDraw(SkCanvas* canvas) {
+    if (canvas->getGrContext() == nullptr) {
+        SkDEBUGF(("Attempting to draw GLFunctor into an unsupported surface"));
+        return;
+    }
+
+    canvas->flush();
+
+    SkImageInfo canvasInfo = canvas->imageInfo();
+    SkMatrix44 mat4(canvas->getTotalMatrix());
+
+    SkIRect ibounds;
+    canvas->getClipDeviceBounds(&ibounds);
+
+    DrawGlInfo info;
+    info.clipLeft = ibounds.fLeft;
+    info.clipTop = ibounds.fTop;
+    info.clipRight = ibounds.fRight;
+    info.clipBottom = ibounds.fBottom;
+    //   info.isLayer = hasLayer();
+    info.isLayer = false;
+    info.width = canvasInfo.width();
+    info.height = canvasInfo.height();
+    mat4.asColMajorf(&info.transform[0]);
+
+    //apply a simple clip with a scissor or a complex clip with a stencil
+    SkRegion clipRegion;
+    SkPath path;
+    canvas->getClipStack()->asPath(&path);
+    clipRegion.setPath(path, SkRegion(ibounds));
+    if (CC_UNLIKELY(clipRegion.isComplex())) {
+        //It is only a temporary solution to use a scissor to draw the stencil.
+        //There is a bug 31489986 to implement efficiently non-rectangular clips.
+        glDisable(GL_SCISSOR_TEST);
+        glDisable(GL_STENCIL_TEST);
+        glStencilMask(0xff);
+        glClearStencil(0);
+        glClear(GL_STENCIL_BUFFER_BIT);
+        glEnable(GL_SCISSOR_TEST);
+        SkRegion::Cliperator it(clipRegion, ibounds);
+        while (!it.done()) {
+            setScissor(info.height, it.rect());
+            glClearStencil(0x1);
+            glClear(GL_STENCIL_BUFFER_BIT);
+            it.next();
+        }
+        glDisable(GL_SCISSOR_TEST);
+        glStencilFunc(GL_EQUAL, 0x1, 0xff);
+        glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+        glEnable(GL_STENCIL_TEST);
+    } else if (clipRegion.isEmpty()) {
+        glDisable(GL_STENCIL_TEST);
+        glDisable(GL_SCISSOR_TEST);
+    } else {
+        glDisable(GL_STENCIL_TEST);
+        glEnable(GL_SCISSOR_TEST);
+        setScissor(info.height, clipRegion.getBounds());
+    }
+
+    (*mFunctor)(DrawGlInfo::kModeDraw, &info);
+
+    canvas->getGrContext()->resetContext();
+ }
+
+}; // namespace skiapipeline
+}; // namespace uirenderer
+}; // namespace android