base: Introducing utility for writing raw data in png format

Originally it was possible to use a Bitmap writer class for dumping a
framebuffer snapshot in a .bmp file. This patch enables you to choose
another format.  In particular it implements the writing of PNG Images
using libpng library.  The latter has to be already installed in your
machine, otherwise gem5 will default to the Bitmap format.  This
configurable writer has been introduced in the VNC frame dumping mechanism,
which is storing changed frame buffers from the VNC server

Change-Id: Id7e5763c82235f1ce90381c8486b85a7cce734ce
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5181
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/src/base/vnc/vncinput.hh b/src/base/vnc/vncinput.hh
index 15ddc5c58..38f42459f 100644
--- a/src/base/vnc/vncinput.hh
+++ b/src/base/vnc/vncinput.hh
@@ -48,7 +48,7 @@
 #include <iostream>
 #include <memory>
 
-#include "base/bitmap.hh"
+#include "base/imgwriter.hh"
 #include "params/VncInput.hh"
 #include "sim/sim_object.hh"
 
@@ -226,8 +226,11 @@ class VncInput : public SimObject
     /** Computed hash of the last captured frame */
     uint64_t captureLastHash;
 
-    /** Cached bitmap object for writing out frame buffers to file */
-    std::unique_ptr<Bitmap> captureBitmap;
+    /** Cached ImgWriter object for writing out frame buffers to file */
+    std::unique_ptr<ImgWriter> captureImage;
+
+    /** image format */
+    Enums::ImageFormat imgFormat;
 
     /** Captures the current frame buffer to a file */
     void captureFrameBuffer();