SkMultiPictureDraw API

This CL adds a new API to optimize across multiple SkPicture draw calls.

Note that multiple pictures rendered at once (i.e., picture piles) should be flattened into a single new picture that includes the required clipping on the different layers.

R=bsalomon@google.com, reed@google.com

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/491313003

1 files changed, 62 insertions, 0 deletions

diff --git a/src/core/SkMultiPictureDraw.cpp b/src/core/SkMultiPictureDraw.cpp
new file mode 100644
index 0000000000..50af2b717e
--- /dev/null
+++ b/src/core/SkMultiPictureDraw.cpp
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkCanvas.h"
+#include "SkMultiPictureDraw.h"
+#include "SkPicture.h"
+
+SkMultiPictureDraw::SkMultiPictureDraw(int reserve) {
+    if (reserve > 0) {
+        fDrawData.setReserve(reserve);
+    }
+}
+
+void SkMultiPictureDraw::reset() {
+    for (int i = 0; i < fDrawData.count(); ++i) {
+        fDrawData[i].picture->unref();
+        fDrawData[i].canvas->unref();
+        SkDELETE(fDrawData[i].paint);
+    }
+
+    fDrawData.rewind();
+}
+
+void SkMultiPictureDraw::add(SkCanvas* canvas, 
+                             const SkPicture* picture,
+                             const SkMatrix* matrix, 
+                             const SkPaint* paint) {
+    if (NULL == canvas || NULL == picture) {
+        SkDEBUGFAIL("parameters to SkMultiPictureDraw::add should be non-NULL");
+        return;
+    }
+
+    DrawData* data = fDrawData.append();
+
+    data->picture = SkRef(picture);
+    data->canvas = SkRef(canvas);
+    if (NULL != matrix) {
+        data->matrix = *matrix;
+    } else {
+        data->matrix.setIdentity();
+    }
+    if (NULL != paint) {
+        data->paint = SkNEW_ARGS(SkPaint, (*paint));
+    } else {
+        data->paint = NULL;
+    }
+}
+
+void SkMultiPictureDraw::draw() {
+    for (int i = 0; i < fDrawData.count(); ++i) {
+        fDrawData[i].canvas->drawPicture(fDrawData[i].picture, 
+                                         &fDrawData[i].matrix, 
+                                         fDrawData[i].paint);
+    }
+
+    this->reset();
+}
+