1 files changed, 54 insertions, 0 deletions
diff --git a/tools/mdbviz/Model.h b/tools/mdbviz/Model.h
new file mode 100644
index 0000000000..773c148c3f
--- /dev/null
+++ b/tools/mdbviz/Model.h
@@ -0,0 +1,54 @@
+/*
+ * 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 "SkBitmap.h"
+#include "SkTDArray.h"
+
+class SkDrawCommand;
+
+// This class encapsulates the both the in-memory representation of the draw ops
+// and the state of Skia/Ganesh's rendering. It should never have any Qt intrusions.
+class Model {
+public:
+    enum class ErrorCode {
+        kOK,
+        kCouldntOpenFile,
+        kCouldntDecodeSKP
+    };
+
+    Model();
+    ~Model();
+
+    static const char* ErrorString(ErrorCode);
+
+    // Replace the list of draw ops by reading the provided skp filename and
+    // reset the Skia draw state. It is up to the view portion to update itself
+    // after this call (i.e., rebuild the opList view).
+    ErrorCode load(const char* filename);
+
+    // Update the rendering state to the provided op
+    void setCurOp(int curOp);
+    int curOp() const { return fCurOp; }
+
+    int numOps() const { return fOps.count(); }
+    const char* getOpName(int index);
+
+    // Get the bits visually representing the current rendering state
+    void* getPixels() const { return fBM.getPixels(); }
+    int width() const { return fBM.width(); }
+    int height() const { return fBM.height(); }
+
+protected:
+    // draw the ops up to (and including) the index-th op
+    void drawTo(int index);
+    void resetOpList();
+
+private:
+    SkTDArray<SkDrawCommand*> fOps;
+    int                       fCurOp;  // The current op the rendering state is at
+    SkBitmap                  fBM;
+};