LibIPC+LibGfx: Pass the IPC::Decoder to decoding helpers

Instead of passing the BufferStream, pass the Decoder. I'd like to stop
using BufferStream eventually anyway, so it's good to get it out of any
API's where it's in currently.

Libraries/LibGfx/Color.cpp

@@ -31,6 +31,7 @@
 #include <AK/Vector.h>
 #include <LibGfx/Color.h>
 #include <LibGfx/SystemTheme.h>
+#include <LibIPC/Decoder.h>
 #include <ctype.h>
 #include <stdio.h>
 
@@ -386,11 +387,10 @@ const LogStream& operator<<(const LogStream& stream, Color value)
     return stream << value.to_string();
 }
 
-bool IPC::decode(BufferStream& stream, Color& color)
+bool IPC::decode(IPC::Decoder& decoder, Color& color)
 {
     u32 rgba = 0;
-    stream >> rgba;
-    if (stream.handle_read_failure())
+    if (!decoder.decode(rgba))
         return false;
     color = Color::from_rgba(rgba);
     return true;

Libraries/LibGfx/Color.h

@@ -28,6 +28,7 @@
 
 #include <AK/Forward.h>
 #include <AK/StdLibExtras.h>
+#include <LibIPC/Forward.h>
 
 namespace Gfx {
 
@@ -280,5 +281,5 @@ const LogStream& operator<<(const LogStream&, Color);
 using Gfx::Color;
 
 namespace IPC {
-bool decode(BufferStream&, Gfx::Color&);
+bool decode(Decoder&, Gfx::Color&);
 }

Libraries/LibGfx/Point.cpp

@@ -27,6 +27,7 @@
 #include <AK/BufferStream.h>
 #include <AK/String.h>
 #include <LibGfx/Point.h>
+#include <LibIPC/Decoder.h>
 
 namespace Gfx {
 
@@ -44,13 +45,13 @@ const LogStream& operator<<(const LogStream& stream, const Point& value)
 
 namespace IPC {
 
-bool decode(BufferStream& stream, Gfx::Point& point)
+bool decode(Decoder& decoder, Gfx::Point& point)
 {
     int x = 0;
     int y = 0;
-    stream >> x;
-    stream >> y;
-    if (stream.handle_read_failure())
+    if (!decoder.decode(x))
+        return false;
+    if (!decoder.decode(y))
         return false;
     point = { x, y };
     return true;

Libraries/LibGfx/Point.h

@@ -29,6 +29,7 @@
 #include <AK/Forward.h>
 #include <AK/StdLibExtras.h>
 #include <LibGfx/Orientation.h>
+#include <LibIPC/Forward.h>
 #include <stdlib.h>
 
 namespace Gfx {
@@ -162,5 +163,5 @@ const LogStream& operator<<(const LogStream&, const Point&);
 }
 
 namespace IPC {
-bool decode(BufferStream&, Gfx::Point&);
+bool decode(Decoder&, Gfx::Point&);
 }

Libraries/LibGfx/Rect.cpp

@@ -28,6 +28,7 @@
 #include <AK/String.h>
 #include <AK/Vector.h>
 #include <LibGfx/Rect.h>
+#include <LibIPC/Decoder.h>
 
 namespace Gfx {
 
@@ -145,13 +146,13 @@ const LogStream& operator<<(const LogStream& stream, const Rect& value)
 
 namespace IPC {
 
-bool decode(BufferStream& stream, Gfx::Rect& rect)
+bool decode(Decoder& decoder, Gfx::Rect& rect)
 {
     Gfx::Point point;
     Gfx::Size size;
-    if (!decode(stream, point))
+    if (!decoder.decode(point))
         return false;
-    if (!decode(stream, size))
+    if (!decoder.decode(size))
         return false;
     rect = { point, size };
     return true;

Libraries/LibGfx/Rect.h

@@ -31,6 +31,7 @@
 #include <LibGfx/Point.h>
 #include <LibGfx/Size.h>
 #include <LibGfx/TextAlignment.h>
+#include <LibIPC/Forward.h>
 #include <stdlib.h>
 
 namespace Gfx {
@@ -337,5 +338,5 @@ const LogStream& operator<<(const LogStream&, const Rect&);
 }
 
 namespace IPC {
-bool decode(BufferStream&, Gfx::Rect&);
+bool decode(Decoder&, Gfx::Rect&);
 }

Libraries/LibGfx/Size.cpp

@@ -27,6 +27,7 @@
 #include <AK/BufferStream.h>
 #include <AK/String.h>
 #include <LibGfx/Size.h>
+#include <LibIPC/Decoder.h>
 
 namespace Gfx {
 
@@ -44,13 +45,13 @@ const LogStream& operator<<(const LogStream& stream, const Size& value)
 
 namespace IPC {
 
-bool decode(BufferStream& stream, Gfx::Size& size)
+bool decode(Decoder& decoder, Gfx::Size& size)
 {
     int width = 0;
     int height = 0;
-    stream >> width;
-    stream >> height;
-    if (stream.handle_read_failure())
+    if (!decoder.decode(width))
+        return false;
+    if (!decoder.decode(height))
         return false;
     size = { width, height };
     return true;

Libraries/LibGfx/Size.h

@@ -28,6 +28,7 @@
 
 #include <AK/Forward.h>
 #include <LibGfx/Orientation.h>
+#include <LibIPC/Forward.h>
 
 namespace Gfx {
 
@@ -113,5 +114,5 @@ const LogStream& operator<<(const LogStream&, const Size&);
 }
 
 namespace IPC {
-bool decode(BufferStream&, Gfx::Size&);
+bool decode(Decoder&, Gfx::Size&);
 }

Libraries/LibIPC/Decoder.h

@@ -59,7 +59,7 @@ public:
     template<typename T>
     bool decode(T& value)
     {
-        return IPC::decode(m_stream, value);
+        return IPC::decode(*this, value);
     }
 
 private: