[RFC spice-streaminh-agent 2/3] mjpeg-fallback: Use Xlib capture helper

[Snir Sheriber <ssheribe@xxxxxxxxxx>]

---
 src/Makefile.am        |  4 ++++
 src/mjpeg-fallback.cpp | 38 +++++++++++++-------------------------
 2 files changed, 17 insertions(+), 25 deletions(-)

diff --git a/src/Makefile.am b/src/Makefile.am
index 0133bf5..31b8af1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -21,6 +21,7 @@ AM_CPPFLAGS = \
 	$(X11_CFLAGS) \
 	$(XFIXES_CFLAGS) \
 	$(XRANDR_CFLAGS) \
+	$(XEXT_CFLAGS) \
 	$(NULL)
 
 AM_CFLAGS = \
@@ -56,6 +57,7 @@ spice_streaming_agent_LDADD = \
 	$(X11_LIBS) \
 	$(XFIXES_LIBS) \
 	$(XRANDR_LIBS) \
+	$(XEXT_LIBS) \
 	$(JPEG_LIBS) \
 	$(NULL)
 
@@ -77,6 +79,8 @@ spice_streaming_agent_SOURCES = \
 	utils.cpp \
 	utils.hpp \
 	x11-display-info.cpp \
+	xlib-capture.cpp \
+	xlib-capture.hpp \
 	$(NULL)
 
 if HAVE_GST
diff --git a/src/mjpeg-fallback.cpp b/src/mjpeg-fallback.cpp
index 03247a1..a43825b 100644
--- a/src/mjpeg-fallback.cpp
+++ b/src/mjpeg-fallback.cpp
@@ -16,6 +16,7 @@
 #include <sstream>
 #include <memory>
 #include <syslog.h>
+#include "xlib-capture.hpp"
 
 using namespace spice::streaming_agent;
 
@@ -44,11 +45,10 @@ public:
 private:
     MjpegSettings settings;
     Display *const dpy;
+    XlibCapture *xc;
 
     std::vector<uint8_t> frame;
 
-    // last frame sizes
-    int last_width = -1, last_height = -1;
     // last time before capture
     uint64_t last_time = 0;
 };
@@ -58,19 +58,21 @@ private:
 MjpegFrameCapture::MjpegFrameCapture(const MjpegSettings& settings):
     settings(settings),dpy(XOpenDisplay(nullptr))
 {
-    if (!dpy)
+    if (!dpy) {
         throw std::runtime_error("Unable to initialize X11");
+    }
+    xc = new XlibCapture(dpy);
 }
 
 MjpegFrameCapture::~MjpegFrameCapture()
 {
+    delete xc;
     XCloseDisplay(dpy);
 }
 
 void MjpegFrameCapture::Reset()
 {
     frame.clear();
-    last_width = last_height = -1;
 }
 
 FrameInfo MjpegFrameCapture::CaptureFrame()
@@ -100,34 +102,20 @@ FrameInfo MjpegFrameCapture::CaptureFrame()
         }
     }
 
-    int screen = XDefaultScreen(dpy);
-
-    Window win = RootWindow(dpy, screen);
+    XImg *image = xc->capture();
 
-    XWindowAttributes win_info;
-    XGetWindowAttributes(dpy, win, &win_info);
+    bool is_first = image->new_resolution();
 
-    bool is_first = false;
-    if (win_info.width != last_width || win_info.height != last_height) {
-        last_width = win_info.width;
-        last_height = win_info.height;
-        is_first = true;
-    }
+    info.size.width = image->width();
+    info.size.height = image->height();
 
-    info.size.width = win_info.width;
-    info.size.height = win_info.height;
-
-    int format = ZPixmap;
-    // TODO handle errors
-    XImage *image = XGetImage(dpy, win, win_info.x, win_info.y,
-                              win_info.width, win_info.height, AllPlanes, format);
 
     // TODO handle errors
     // TODO multiple formats (only 32 bit)
-    write_JPEG_file(frame, settings.quality, (uint8_t*) image->data,
-                    image->width, image->height);
+    write_JPEG_file(frame, settings.quality, (uint8_t*) image->get_data(),
+                    image->width(), image->height());
 
-    image->f.destroy_image(image);
+    delete image;
 
     info.buffer = &frame[0];
     info.buffer_size = frame.size();
-- 
2.21.0

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