Add tiled rendering as an option to GM.

Use an SkGPipe to play back drawing into tiles.
This will help us to debug differences in drawing
while tiled.

Pass --tiledPipe to gm to use the tiled pipe.
Review URL: https://codereview.appspot.com/6295050

git-svn-id: http://skia.googlecode.com/svn/trunk@4199 2bbb7eff-a529-9590-31e7-b0007b416f81

3 files changed, 126 insertions, 2 deletions

diff --git a/src/pipe/SkGPipeRead.cpp b/src/pipe/SkGPipeRead.cpp
index 976abbf10a..ddc0cc41d9 100644
--- a/src/pipe/SkGPipeRead.cpp
+++ b/src/pipe/SkGPipeRead.cpp
@@ -545,12 +545,21 @@ SkGPipeState::~SkGPipeState() {
 
 #include "SkGPipe.h"
 
+SkGPipeReader::SkGPipeReader() {
+    fCanvas = NULL;
+    fState = NULL;
+}
+
 SkGPipeReader::SkGPipeReader(SkCanvas* target) {
-    SkSafeRef(target);
-    fCanvas = target;
+    fCanvas = NULL;
+    this->setCanvas(target);
     fState = NULL;
 }
 
+void SkGPipeReader::setCanvas(SkCanvas *target) {
+    SkRefCnt_SafeAssign(fCanvas, target);
+}
+
 SkGPipeReader::~SkGPipeReader() {
     SkSafeUnref(fCanvas);
     delete fState;
diff --git a/src/pipe/utils/SamplePipeControllers.cpp b/src/pipe/utils/SamplePipeControllers.cpp
new file mode 100644
index 0000000000..487a2b8356
--- /dev/null
+++ b/src/pipe/utils/SamplePipeControllers.cpp
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SamplePipeControllers.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkGPipe.h"
+
+PipeController::PipeController(SkCanvas* target)
+:fReader(target) {
+    fBlock = NULL;
+    fBlockSize = fBytesWritten = 0;
+}
+
+PipeController::~PipeController() {
+    sk_free(fBlock);
+}
+
+void* PipeController::requestBlock(size_t minRequest, size_t *actual) {
+    sk_free(fBlock);
+    fBlockSize = minRequest * 4;
+    fBlock = sk_malloc_throw(fBlockSize);
+    fBytesWritten = 0;
+    *actual = fBlockSize;
+    return fBlock;
+}
+
+void PipeController::notifyWritten(size_t bytes) {
+    fStatus = fReader.playback(this->getData(), bytes);
+    SkASSERT(SkGPipeReader::kError_Status != fStatus);
+    fBytesWritten += bytes;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+TiledPipeController::TiledPipeController(const SkBitmap& bitmap)
+: INHERITED(NULL) {
+    int32_t top = 0;
+    int32_t bottom;
+    int32_t height = bitmap.height() / NumberOfTiles;
+    SkIRect rect;
+    for (int i = 0; i < NumberOfTiles; i++) {
+        bottom = i + 1 == NumberOfTiles ? bitmap.height() : top + height;
+        rect.setLTRB(0, top, bitmap.width(), bottom);
+        top = bottom;
+
+        bool extracted = bitmap.extractSubset(&fBitmaps[i], rect);
+        SkASSERT(extracted);
+        SkDevice* device = new SkDevice(fBitmaps[i]);
+        SkCanvas* canvas = new SkCanvas(device);
+        device->unref();
+        canvas->translate(SkIntToScalar(-rect.left()),
+                          SkIntToScalar(-rect.top()));
+        if (0 == i) {
+            fReader.setCanvas(canvas);
+        } else {
+            fReaders[i - 1].setCanvas(canvas);
+        }
+        canvas->unref();
+    }
+}
+
+void TiledPipeController::notifyWritten(size_t bytes) {
+    for (int i = 0; i < NumberOfTiles - 1; i++) {
+        fReaders[i].playback(this->getData(), bytes);
+    }
+    this->INHERITED::notifyWritten(bytes);
+}
diff --git a/src/pipe/utils/SamplePipeControllers.h b/src/pipe/utils/SamplePipeControllers.h
new file mode 100644
index 0000000000..ace6274bae
--- /dev/null
+++ b/src/pipe/utils/SamplePipeControllers.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkBitmap.h"
+#include "SkGPipe.h"
+
+class SkCanvas;
+
+class PipeController : public SkGPipeController {
+public:
+    PipeController(SkCanvas* target);
+    virtual ~PipeController();
+    virtual void* requestBlock(size_t minRequest, size_t* actual) SK_OVERRIDE;
+    virtual void notifyWritten(size_t bytes) SK_OVERRIDE;
+protected:
+    const void* getData() { return (const char*) fBlock + fBytesWritten; }
+    SkGPipeReader fReader;
+private:
+    void* fBlock;
+    size_t fBlockSize;
+    size_t fBytesWritten;
+    SkGPipeReader::Status fStatus;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TiledPipeController : public PipeController {
+public:
+    TiledPipeController(const SkBitmap&);
+    virtual ~TiledPipeController() {};
+    virtual void notifyWritten(size_t bytes) SK_OVERRIDE;
+private:
+    enum {
+        NumberOfTiles = 10
+    };
+    SkGPipeReader fReaders[NumberOfTiles - 1];
+    SkBitmap fBitmaps[NumberOfTiles];
+    typedef PipeController INHERITED;
+};