Solidify Model/View split

Change-Id: Iecf034feaa009002b5f09c47052c915d22aec0e4
Reviewed-on: https://skia-review.googlesource.com/43040
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>

1 files changed, 100 insertions, 0 deletions

diff --git a/tools/mdbviz/Model.cpp b/tools/mdbviz/Model.cpp
new file mode 100644
index 0000000000..a3f8e1ae87
--- /dev/null
+++ b/tools/mdbviz/Model.cpp
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <memory>
+
+#include "Model.h"
+
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkDebugCanvas.h"
+#include "SkPicture.h"
+#include "SkStream.h"
+
+Model::Model() : fCurOp(0) {
+    SkImageInfo ii = SkImageInfo::MakeN32Premul(1024, 1024);
+    fBM.allocPixels(ii, 0);
+}
+
+Model::~Model() {
+    this->resetOpList();
+}
+
+Model::ErrorCode Model::load(const char* filename) {
+    std::unique_ptr<SkStream> stream = SkStream::MakeFromFile(filename);
+    if (!stream) {
+        return ErrorCode::kCouldntOpenFile;
+    }
+    sk_sp<SkPicture> pic(SkPicture::MakeFromStream(stream.get()));
+    if (!pic) {
+        return ErrorCode::kCouldntDecodeSKP;
+    }
+
+    {
+        std::unique_ptr<SkDebugCanvas> temp(new SkDebugCanvas(
+                                                    SkScalarCeilToInt(pic->cullRect().width()),
+                                                    SkScalarCeilToInt(pic->cullRect().height())));
+
+        temp->setPicture(pic.get());
+        pic->playback(temp.get());
+        temp->setPicture(nullptr);
+        this->resetOpList();
+        temp->detachCommands(&fOps);
+    }
+
+    this->setCurOp(fOps.count()-1);
+
+    return ErrorCode::kOK;
+}
+
+const char* Model::ErrorString(ErrorCode err) {
+    static const char* kStrings[] = {
+        "OK",
+        "Couldn't read file",
+        "Couldn't decode picture"
+    };
+
+    return kStrings[(int)err];
+}
+
+const char* Model::getOpName(int index) {
+    return SkDrawCommand::GetCommandString(fOps[index]->getType());
+}
+
+void Model::setCurOp(int curOp) {
+    SkASSERT(curOp < fOps.count());
+
+    if (curOp == fCurOp) {
+        return; // the render state is already up to date
+    }
+
+    fCurOp = curOp;
+    this->drawTo(fCurOp);
+}
+
+void Model::drawTo(int index) {
+    SkASSERT(index < fOps.count());
+
+    SkCanvas canvas(fBM);
+
+    int saveCount = canvas.save();
+
+    for (int i = 0; i <= index; ++i) {
+        if (fOps[i]->isVisible()) {
+            fOps[i]->execute(&canvas);
+        }
+    }
+
+    canvas.restoreToCount(saveCount);
+}
+
+void Model::resetOpList() {
+    for (int i = 0; i < fOps.count(); ++i) {
+        delete fOps[i];
+    }
+    fCurOp = 0;
+}