[RFC PATCH qxl-wddm-dod 02/28] Add printer class to dump debug print statements to kernel debugger output

[Dmitry Fleytman <dmitry@xxxxxxxxxx>]

From: Sandy Stutsman <sstutsma@xxxxxxxxxx>

Allows the usage of Kd_IHVVIDEO_Mask to control print level while debugging
---
 qxldod/driver.cpp | 24 +++++++++++++++++++++++-
 qxldod/driver.h   | 22 ++++++++++++++++++----
 2 files changed, 41 insertions(+), 5 deletions(-)

diff --git a/qxldod/driver.cpp b/qxldod/driver.cpp
index 4d1913c..2098421 100755
--- a/qxldod/driver.cpp
+++ b/qxldod/driver.cpp
@@ -667,7 +667,29 @@ void DebugPrintFunc(const char *format, ...)
     va_start(list, format);
     vDbgPrintEx(DPFLTR_DEFAULT_ID, 9 | DPFLTR_MASK, format, list);
 }
+ULONG kd_debug_printer::_xlate [] = { 0, 0, 1, 2, 3 };
+
+kd_debug_printer::kd_debug_printer(ULONG level) : _off(FALSE)
+{
+    if (!level || level > 5) {
+        _off = TRUE;
+        _level = 0xffffffff;
+
+    }
+    else {
+        _level = _xlate[level - 1];
+    }
+}
+
+void kd_debug_printer::print(const char * fmt, ...)
+{
+    va_list list;
+    va_start(list, fmt);
+    if (_off) {
+        return;
+    }
+    vDbgPrintEx(DPFLTR_IHVVIDEO_ID, _level, fmt, list);
+}
 #endif
 
 #pragma code_seg(pop) // End Non-Paged Code
-
diff --git a/qxldod/driver.h b/qxldod/driver.h
index e64c098..d7f7bf8 100755
--- a/qxldod/driver.h
+++ b/qxldod/driver.h
@@ -208,15 +208,29 @@ DodSystemDisplayWrite(
     _In_  UINT  PositionY);
 
 #if DBG
+class kd_debug_printer 
+{
+public:
+    kd_debug_printer(ULONG level);
+    void print(const char * fmt, ...);
+private:
+    ULONG _level;
+    BOOLEAN _off;
+    static ULONG _xlate[6];
+ };
 
 extern int nDebugLevel;
 void DebugPrintFuncSerial(const char *format, ...);
 
-void DebugPrintFunc(const char *format, ...);
+void DebugPrintFunc(const char *format, ...);
+
+#define DbgPrint(level, line)           \
+    if (level > nDebugLevel) {}         \
+    else {                              \
+       DebugPrintFuncSerial line;       \
+     }                                  \
+     kd_debug_printer(level).print line
 
-#define DbgPrint(level, line) \
-    if (level > nDebugLevel) {} \
-    else DebugPrintFuncSerial line
 #else
 #define DbgPrint(level, line) 
 #endif
-- 
1.8.3.1

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