Initial rfx progressive integration

- Mostly base functions and utilities necessary to enable RFX
  Progressive
- Add more EGFX work & mode flags.
- Update encoder.
- Does not yet include caps determination to enable RFX progressive
  (yet).
- Update protocol constants

common/xrdp_constants.h

@@ -291,4 +291,50 @@
 #define XR_RDP_SCAN_LSHIFT 42
 #define XR_RDP_SCAN_ALT    56
 
+// Since we're not guaranteed to have pixman, copy these directives.
+#define XRDP_PIXMAN_TYPE_ARGB   2
+#define XRDP_PIXMAN_TYPE_ABGR   3
+#define XRDP_PIXMAN_FORMAT(bpp,type,a,r,g,b)    (((bpp) << 24) |  \
+        ((type) << 16) | \
+        ((a) << 12) |    \
+        ((r) << 8) |     \
+        ((g) << 4) |     \
+        ((b)))
+
+#define XRDP_a8b8g8r8 \
+    XRDP_PIXMAN_FORMAT(32, XRDP_PIXMAN_TYPE_ABGR, 8, 8, 8, 8)
+
+#define XRDP_a8r8g8b8 \
+    XRDP_PIXMAN_FORMAT(32, XRDP_PIXMAN_TYPE_ARGB, 8, 8, 8, 8)
+
+#define XRDP_r5g6b5 \
+    XRDP_PIXMAN_FORMAT(16, XRDP_PIXMAN_TYPE_ARGB, 0, 5, 6, 5)
+
+#define XRDP_a1r5g5b5 \
+    XRDP_PIXMAN_FORMAT(16, XRDP_PIXMAN_TYPE_ARGB, 1, 5, 5, 5)
+
+#define XRDP_r3g3b2 \
+    XRDP_PIXMAN_FORMAT(8, XRDP_PIXMAN_TYPE_ARGB, 0, 3, 3, 2)
+
+// The last used constant in pixman is 63, so use 64+
+#define XRDP_nv12 \
+    XRDP_PIXMAN_FORMAT(12, 64, 0, 0, 0, 0)
+
+#define XRDP_i420 \
+    XRDP_PIXMAN_FORMAT(12, 65, 0, 0, 0, 0)
+
+#define XRDP_nv12_709fr \
+    XRDP_PIXMAN_FORMAT(12, 66, 0, 0, 0, 0)
+
+#define XRDP_yuv444_709fr \
+    XRDP_PIXMAN_FORMAT(32, 67, 0, 0, 0, 0)
+
+// https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpegfx/8131c1bc-1af8-4907-a05a-f72f4581160f
+#define XRDP_yuv444_v1_stream_709fr \
+    XRDP_PIXMAN_FORMAT(32, 68, 0, 0, 0, 0)
+
+// https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpegfx/781406c3-5e24-4f2b-b6ff-42b76bf64f6d
+#define XRDP_yuv444_v2_stream_709fr \
+    XRDP_PIXMAN_FORMAT(32, 69, 0, 0, 0, 0)
+
 #endif