Resolve a TODO and fix another ancient bug, #386. Print Screen is now handled

by BWindow, no longer by the app_server. This should stop the "screen freeze"
effect.

This adds a dependency on libpng.so and libz.so to libbe.so. The same
dependencies and the PNGDump code added here can be removed from the
app_server. I am just waiting for a code review of this before doing that.

This implementation still does not give the client a chance to handle it
differently.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25269 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/Window.cpp

@@ -17,6 +17,7 @@
 
 #include <Application.h>
 #include <Autolock.h>
+#include <Bitmap.h>
 #include <Button.h>
 #include <MenuBar.h>
 #include <MenuItem.h>
@@ -41,6 +42,8 @@
 #include <tracker_private.h>
 #include <WindowPrivate.h>
 
+#include "PNGDump.h"
+
 
 //#define DEBUG_WIN
 #ifdef DEBUG_WIN
@@ -3239,6 +3242,39 @@ BWindow::_HandleKeyDown(BMessage* event)
 		PostMessage(&message);
 		return true;
 	}
+
+	if (key == B_FUNCTION_KEY) {
+		// Check for Print Screen
+		int32 rawKey;
+		if (event->FindInt32("key", &rawKey) == B_OK && rawKey == B_PRINT_KEY) {
+			// Get filename
+			char filename[128];
+			BEntry entry;
+
+			int32 index = 1;
+			do {
+				// TODO: Use find_directory(B_USER_DIRECTORY, ...)
+				sprintf(filename, "/boot/home/screen%ld.png", index++);
+				entry.SetTo(filename);
+			} while(entry.Exists());
+
+			// Get the screen bitmap
+			BScreen screen(this);
+			BBitmap* screenDump;
+			screen.GetBitmap(&screenDump, false);
+
+			// Dump to PNG
+			SaveToPNG(filename, screen.Frame(), screenDump->ColorSpace(),
+				screenDump->Bits(),
+				screenDump->BitsLength(),
+				screenDump->BytesPerRow());
+
+			// Free the bitmap allocated by BScreen.GetBitmap
+			delete screenDump;
+
+			return true;
+		}
+	}
 	
 	// Handle shortcuts
 	if ((modifiers & B_COMMAND_KEY) != 0) {