base: Add serialization support to Pixels and FrameBuffer

Serialize pixels as unsigned 32 bit integers by adding the required
to_number() and stream operators. This is used by the FrameBuffer,
which now implements the Serializable interface. Users of frame
buffers are expected to serialize it into its own section by calling
serializeSection().

2 files changed, 44 insertions, 2 deletions

diff --git a/src/base/framebuffer.cc b/src/base/framebuffer.cc
index dc4c2e1c2..73f724892 100644
--- a/src/base/framebuffer.cc
+++ b/src/base/framebuffer.cc
@@ -122,6 +122,23 @@ FrameBuffer::~FrameBuffer()
 {
 }
 
+
+void
+FrameBuffer::serialize(CheckpointOut &cp) const
+{
+    SERIALIZE_SCALAR(_width);
+    SERIALIZE_SCALAR(_height);
+    SERIALIZE_CONTAINER(pixels);
+}
+
+void
+FrameBuffer::unserialize(CheckpointIn &cp)
+{
+    UNSERIALIZE_SCALAR(_width);
+    UNSERIALIZE_SCALAR(_height);
+    UNSERIALIZE_CONTAINER(pixels);
+}
+
 void
 FrameBuffer::resize(unsigned width, unsigned height)
 {
diff --git a/src/base/framebuffer.hh b/src/base/framebuffer.hh
index 457c6d06d..eaac25111 100644
--- a/src/base/framebuffer.hh
+++ b/src/base/framebuffer.hh
@@ -43,9 +43,14 @@
 #include <cmath>
 #include <cstdint>
 
+#include <string>
 #include <vector>
 
+#include "base/compiler.hh"
+#include "base/cprintf.hh"
+#include "base/str.hh"
 #include "base/types.hh"
+#include "sim/serialize.hh"
 
 /**
  * Internal gem5 representation of a Pixel.
@@ -73,7 +78,6 @@ operator==(const Pixel &lhs, const Pixel &rhs)
         lhs.padding == rhs.padding;
 }
 
-
 /**
  * Configurable RGB pixel converter.
  *
@@ -208,6 +212,24 @@ class PixelConverter
     static const PixelConverter rgb565_be;
 };
 
+inline bool
+to_number(const std::string &value, Pixel &retval)
+{
+    uint32_t num;
+    if (!to_number(value, num))
+        return false;
+
+    retval = PixelConverter::rgba8888_le.toPixel(num);
+    return true;
+}
+
+inline std::ostream &
+operator<<(std::ostream &os, const Pixel &pxl)
+{
+    os << csprintf("0x%.08x", PixelConverter::rgba8888_le.fromPixel(pxl));
+    return os;
+}
+
 /**
  * Internal gem5 representation of a frame buffer
  *
@@ -219,7 +241,7 @@ class PixelConverter
  * corner. The backing store is a linear vector of Pixels ordered left
  * to right starting in the upper left corner.
  */
-class FrameBuffer
+class FrameBuffer : public Serializable
 {
   public:
     /**
@@ -234,6 +256,9 @@ class FrameBuffer
 
     virtual ~FrameBuffer();
 
+    void serialize(CheckpointOut &cp) const M5_ATTR_OVERRIDE;
+    void unserialize(CheckpointIn &cp) M5_ATTR_OVERRIDE;
+
     /**
      * Resize the frame buffer.
      *