Support Surface and Layer Readback in the SkiaPipelines.

Test: CTS TextureViewTests and UIRendering
Change-Id: I2969c8f5a975bfd9aebcbb585c64d1fcbb2487c2

libs/hwui/renderthread/OpenGLPipeline.cpp

diff --git a/libs/hwui/renderthread/OpenGLPipeline.cpp b/libs/hwui/renderthread/OpenGLPipeline.cpp
index afeeef86..177a729 100644
--- a/libs/hwui/renderthread/OpenGLPipeline.cpp
+++ b/libs/hwui/renderthread/OpenGLPipeline.cpp
@@ -20,7 +20,7 @@
 #include "EglManager.h"
 #include "ProfileRenderer.h"
 #include "renderstate/RenderState.h"
-#include "Readback.h"
+#include "OpenGLReadback.h"
 
 #include <android/native_window.h>
 #include <cutils/properties.h>
@@ -117,9 +117,9 @@
 }
 
 bool OpenGLPipeline::copyLayerInto(DeferredLayerUpdater* layer, SkBitmap* bitmap) {
+    ATRACE_CALL();
     layer->apply();
-    return Readback::copyTextureLayerInto(mRenderThread, *(layer->backingLayer()), bitmap)
-            == CopyResult::Success;
+    return OpenGLReadbackImpl::copyLayerInto(mRenderThread, *(layer->backingLayer()), bitmap);
 }
 
 DeferredLayerUpdater* OpenGLPipeline::createTextureLayer() {

libs/hwui/renderthread/RenderProxy.cpp

diff --git a/libs/hwui/renderthread/RenderProxy.cpp b/libs/hwui/renderthread/RenderProxy.cpp
index 39e5931..2c48242 100644
--- a/libs/hwui/renderthread/RenderProxy.cpp
+++ b/libs/hwui/renderthread/RenderProxy.cpp
@@ -602,8 +602,8 @@
 
 CREATE_BRIDGE4(copySurfaceInto, RenderThread* thread,
         Surface* surface, Rect srcRect, SkBitmap* bitmap) {
-    return (void*) Readback::copySurfaceInto(*args->thread,
-            *args->surface, args->srcRect, args->bitmap);
+    return (void*)args->thread->readback().copySurfaceInto(*args->surface,
+            args->srcRect, args->bitmap);
 }
 
 int RenderProxy::copySurfaceInto(sp<Surface>& surface, int left, int top,

libs/hwui/renderthread/RenderThread.cpp

diff --git a/libs/hwui/renderthread/RenderThread.cpp b/libs/hwui/renderthread/RenderThread.cpp
index f3789c8..223958a 100644
--- a/libs/hwui/renderthread/RenderThread.cpp
+++ b/libs/hwui/renderthread/RenderThread.cpp
@@ -17,8 +17,10 @@
 #include "RenderThread.h"
 
 #include "../renderstate/RenderState.h"
+#include "../pipeline/skia/SkiaOpenGLReadback.h"
 #include "CanvasContext.h"
 #include "EglManager.h"
+#include "OpenGLReadback.h"
 #include "RenderProxy.h"
 #include "VulkanManager.h"
 
@@ -196,6 +198,30 @@
     mVkManager = new VulkanManager(*this);
 }
 
+Readback& RenderThread::readback() {
+
+    if (!mReadback) {
+        auto renderType = Properties::getRenderPipelineType();
+        switch (renderType) {
+            case RenderPipelineType::OpenGL:
+                mReadback = new OpenGLReadbackImpl(*this);
+                break;
+            case RenderPipelineType::SkiaGL:
+            case RenderPipelineType::SkiaVulkan:
+                // It works to use the OpenGL pipeline for Vulkan but this is not
+                // ideal as it causes us to create an OpenGL context in addition
+                // to the Vulkan one.
+                mReadback = new skiapipeline::SkiaOpenGLReadback(*this);
+                break;
+            default:
+                LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t) renderType);
+                break;
+        }
+    }
+
+    return *mReadback;
+}
+
 int RenderThread::displayEventReceiverCallback(int fd, int events, void* data) {
     if (events & (Looper::EVENT_ERROR | Looper::EVENT_HANGUP)) {
         ALOGE("Display event receiver pipe was closed or an error occurred.  "

libs/hwui/renderthread/RenderThread.h

diff --git a/libs/hwui/renderthread/RenderThread.h b/libs/hwui/renderthread/RenderThread.h
index 12050dd..d121bcf 100644
--- a/libs/hwui/renderthread/RenderThread.h
+++ b/libs/hwui/renderthread/RenderThread.h
@@ -37,6 +37,7 @@
 
 namespace uirenderer {
 
+class Readback;
 class RenderState;
 class TestUtils;
 
@@ -93,6 +94,7 @@
     RenderState& renderState() const { return *mRenderState; }
     EglManager& eglManager() const { return *mEglManager; }
     JankTracker& jankTracker() { return *mJankTracker; }
+    Readback& readback();
 
     const DisplayInfo& mainDisplayInfo() { return mDisplayInfo; }
 
@@ -151,6 +153,7 @@
     EglManager* mEglManager;
 
     JankTracker* mJankTracker = nullptr;
+    Readback* mReadback = nullptr;
 
     sk_sp<GrContext> mGrContext;
     VulkanManager* mVkManager;