Adding immediate mode draw target for debug

src/gpu/GrImmediateDrawTarget.cpp

Index: src/gpu/GrImmediateDrawTarget.cpp
diff --git a/src/gpu/GrImmediateDrawTarget.cpp b/src/gpu/GrImmediateDrawTarget.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4c42a30f864d7c3982b80642882329ddeff24446
--- /dev/null
+++ b/src/gpu/GrImmediateDrawTarget.cpp
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrImmediateDrawTarget.h"
+
+#include "GrBatch.h"
+#include "GrGpu.h"
+#include "GrPipeline.h"
+#include "GrRenderTarget.h"
+#include "SkRect.h"
+#include "SkTypes.h"
+
+GrImmediateDrawTarget::GrImmediateDrawTarget(GrContext* context)
+    : INHERITED(context)
+    , fBatchTarget(this->getGpu())
+    , fDrawID(0) {
+}
+
+GrImmediateDrawTarget::~GrImmediateDrawTarget() {
+    this->reset();
+}
+
+void GrImmediateDrawTarget::onDrawBatch(GrBatch* batch,
+                                        const PipelineInfo& pipelineInfo) {
+    SkAlignedSStorage<sizeof(GrPipeline)> pipelineStorage;
+    GrPipeline* pipeline = reinterpret_cast<GrPipeline*>(pipelineStorage.get());
+    if (!this->setupPipelineAndShouldDraw(pipeline, pipelineInfo)) {
+        pipeline->~GrPipeline();
+        return;
+    }
+
+    batch->initBatchTracker(pipeline->getInitBatchTracker());
+
+    fBatchTarget.resetNumberOfDraws();
+
+    batch->generateGeometry(&fBatchTarget, pipeline);
+    batch->setNumberOfDraws(fBatchTarget.numberOfDraws());
+
+    fBatchTarget.preFlush();
+    fBatchTarget.flushNext(batch->numberOfDraws());
+    fBatchTarget.postFlush();
+
+    pipeline->~GrPipeline();
+}
+
+void GrImmediateDrawTarget::onClear(const SkIRect* rect, GrColor color,
+                                    bool canIgnoreRect, GrRenderTarget* renderTarget) {
+    this->getGpu()->clear(rect, color, canIgnoreRect, renderTarget);
+}
+
+void GrImmediateDrawTarget::onCopySurface(GrSurface* dst,
+                                          GrSurface* src,
+                                          const SkIRect& srcRect,
+                                          const SkIPoint& dstPoint) {
+    SkASSERT(this->getGpu()->canCopySurface(dst, src, srcRect, dstPoint));
+    this->getGpu()->copySurface(dst, src, srcRect, dstPoint);
+}
+
+void GrImmediateDrawTarget::clearStencilClip(const SkIRect& rect,
+                                             bool insideClip,
+                                             GrRenderTarget* renderTarget) {
+    this->getGpu()->clearStencilClip(rect, insideClip, renderTarget);
+}
+
+void GrImmediateDrawTarget::discard(GrRenderTarget* renderTarget) {
+    if (!this->caps()->discardRenderTargetSupport()) {
+        return;
+    }
+
+    this->getGpu()->discard(renderTarget);
+}
+
+void GrImmediateDrawTarget::onReset() {
+    fBatchTarget.reset();
+}
+
+void GrImmediateDrawTarget::onFlush() {
+    ++fDrawID;
+}
+
+bool
+GrImmediateDrawTarget::setupPipelineAndShouldDraw(GrPipeline* pipeline,
+                                                  const GrDrawTarget::PipelineInfo& pipelineInfo) {
+    this->setupPipeline(pipelineInfo, pipeline);
+
+    if (pipeline->mustSkip()) {
+        return false;
+    }
+
+    this->recordXferBarrierIfNecessary(pipeline);
+    return true;
+}
+
+void GrImmediateDrawTarget::recordXferBarrierIfNecessary(const GrPipeline* pipeline) {
+    const GrXferProcessor& xp = *pipeline->getXferProcessor();
+    GrRenderTarget* rt = pipeline->getRenderTarget();
+
+    GrXferBarrierType barrierType;
+    if (xp.willNeedXferBarrier(rt, *this->caps(), &barrierType)) {
+        this->getGpu()->xferBarrier(rt, barrierType);
+    }
+}