Add DX related color conversion functions (#649)

* Add DX related color conversion functions

* Remove blank lines and move functions to the top

src/shared/d3d9types.rs

@@ -12,6 +12,35 @@ use shared::minwindef::{BOOL, BYTE, DWORD, FLOAT, INT, UINT, USHORT, WORD};
 use shared::windef::HWND;
 use um::winnt::{HANDLE, HRESULT, LARGE_INTEGER, LONG, SHORT};
 pub type D3DCOLOR = DWORD;
+#[inline]
+pub fn D3DCOLOR_ARGB(a: DWORD, r: DWORD, g: DWORD, b: DWORD) -> D3DCOLOR {
+    (((a & 0xff) << 24) | ((r & 0xff) << 16) | ((g & 0xff) << 8) | (b & 0xff)) as D3DCOLOR
+}
+#[inline]
+pub fn D3DCOLOR_RGBA(r: DWORD, g: DWORD, b: DWORD, a: DWORD) -> D3DCOLOR {
+    D3DCOLOR_ARGB(a, r, g, b)
+}
+#[inline]
+pub fn D3DCOLOR_XRGB(r: DWORD, g: DWORD, b: DWORD) -> D3DCOLOR {
+    D3DCOLOR_ARGB(0xff, r, g, b)
+}
+#[inline]
+pub fn D3DCOLOR_XYUV(y: DWORD, u: DWORD, v: DWORD) -> D3DCOLOR {
+    D3DCOLOR_ARGB(0xff, y, u, v)
+}
+#[inline]
+pub fn D3DCOLOR_AYUV(a: DWORD, y: DWORD, u: DWORD, v: DWORD) -> D3DCOLOR {
+    D3DCOLOR_ARGB(a, y, u, v)
+}
+#[inline]
+pub fn D3DCOLOR_COLORVALUE(r: f32, g: f32, b: f32, a: f32) -> D3DCOLOR {
+    D3DCOLOR_ARGB(
+        (r * 255f32) as DWORD,
+        (g * 255f32) as DWORD,
+        (b * 255f32) as DWORD,
+        (a * 255f32) as DWORD,
+    )
+}
 STRUCT!{struct D3DVECTOR {
     x: c_float,
     y: c_float,