1 files changed, 201 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/libANGLE/OverlayWidgets.h b/gfx/angle/checkout/src/libANGLE/OverlayWidgets.h
new file mode 100644
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+++ b/gfx/angle/checkout/src/libANGLE/OverlayWidgets.h
@@ -0,0 +1,201 @@
+//
+// Copyright 2019 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// OverlayWidgets.h:
+//    Defines the Overlay* widget classes and corresponding enums.
+//
+
+#ifndef LIBANGLE_OVERLAYWIDGETS_H_
+#define LIBANGLE_OVERLAYWIDGETS_H_
+
+#include "common/angleutils.h"
+#include "libANGLE/Overlay_autogen.h"
+
+namespace gl
+{
+class Overlay;
+class OverlayState;
+
+namespace overlay_impl
+{
+class AppendWidgetDataHelper;
+}  // namespace overlay_impl
+
+enum class WidgetType
+{
+    // Text types:
+
+    // A total count of some event.
+    Count,
+    // A single line of ASCII text.  Retains content until changed.
+    Text,
+    // A per-second value.
+    PerSecond,
+
+    // Graph types:
+
+    // A graph of the last N values.
+    RunningGraph,
+    // A histogram of the last N values (values between 0 and 1).
+    RunningHistogram,
+
+    InvalidEnum,
+    EnumCount = InvalidEnum,
+};
+
+namespace overlay
+{
+class Text;
+class Widget
+{
+  public:
+    virtual ~Widget() {}
+
+    virtual const Text *getDescriptionWidget() const;
+
+  protected:
+    WidgetType type;
+    // Whether this item should be drawn.
+    bool enabled = false;
+
+    // For text items, size of the font.  This is a value in [0, overlay::kFontMipCount) which
+    // determines the font size to use.
+    int fontSize;
+
+    // The area covered by the item, predetermined by the overlay class.  Negative values
+    // indicate offset from the left/bottom of the image.
+    int32_t coords[4];
+    float color[4];
+
+    // In some cases, a widget may need to match its contents (e.g. graph height scaling) with
+    // another related widget.  In such a case, this pointer will point to the widget it needs to
+    // match to.
+    Widget *matchToWidget;
+
+    friend class gl::Overlay;
+    friend class gl::OverlayState;
+    friend class overlay_impl::AppendWidgetDataHelper;
+};
+
+class Count : public Widget
+{
+  public:
+    ~Count() override {}
+    void add(uint64_t n) { count += n; }
+    void set(uint64_t n) { count = n; }
+    void reset() { count = 0; }
+
+  protected:
+    uint64_t count = 0;
+
+    friend class gl::Overlay;
+    friend class overlay_impl::AppendWidgetDataHelper;
+};
+
+class PerSecond : public Count
+{
+  public:
+    ~PerSecond() override {}
+
+  protected:
+    uint64_t lastPerSecondCount = 0;
+
+    friend class gl::Overlay;
+    friend class overlay_impl::AppendWidgetDataHelper;
+};
+
+class Text : public Widget
+{
+  public:
+    ~Text() override {}
+    void set(std::string &&str) { text = std::move(str); }
+
+  protected:
+    std::string text;
+
+    friend class overlay_impl::AppendWidgetDataHelper;
+};
+
+class RunningGraph : public Widget
+{
+  public:
+    // Out of line constructor to satisfy chromium-style.
+    RunningGraph(size_t n);
+    ~RunningGraph() override;
+
+    void add(uint64_t n)
+    {
+        if (!ignoreFirstValue)
+        {
+            runningValues[lastValueIndex] += n;
+        }
+    }
+
+    void next()
+    {
+        if (ignoreFirstValue)
+        {
+            ignoreFirstValue = false;
+        }
+        else
+        {
+            lastValueIndex                = (lastValueIndex + 1) % runningValues.size();
+            runningValues[lastValueIndex] = 0;
+        }
+    }
+
+    const Text *getDescriptionWidget() const override;
+
+  protected:
+    std::vector<uint64_t> runningValues;
+    size_t lastValueIndex = 0;
+    Text description;
+    bool ignoreFirstValue = true;
+
+    friend class gl::Overlay;
+    friend class gl::OverlayState;
+    friend class overlay_impl::AppendWidgetDataHelper;
+};
+
+class RunningHistogram : public RunningGraph
+{
+  public:
+    RunningHistogram(size_t n) : RunningGraph(n) {}
+    ~RunningHistogram() override {}
+
+    void set(float n)
+    {
+        ASSERT(n >= 0.0f && n <= 1.0f);
+        uint64_t rank =
+            n == 1.0f ? runningValues.size() - 1 : static_cast<uint64_t>(n * runningValues.size());
+
+        runningValues[lastValueIndex] = rank;
+    }
+
+  private:
+    // Do not use the add() function from RunningGraph
+    using RunningGraph::add;
+};
+
+// If overlay is disabled, all the above classes would be replaced with Mock, turning them into
+// noop.
+class Mock
+{
+  public:
+    void reset() const {}
+    template <typename T>
+    void set(T) const
+    {}
+    template <typename T>
+    void add(T) const
+    {}
+    void next() const {}
+};
+
+}  // namespace overlay
+
+}  // namespace gl
+
+#endif  // LIBANGLE_OVERLAYWIDGETS_H_