Fixed VDU snow.

Author: Bekenn

dist/wcdx/idl/iwcdx.idl

@@ -53,4 +53,6 @@ interface IWcdx : IUnknown
 
     HRESULT QueryValue([in, string] const wchar_t* keyname, [in, string] const wchar_t* valuename, [out, size_is(*size)] void* data, [in, out, ref] DWORD* size);
     HRESULT SetValue([in, string] const wchar_t* keyname, [in, string] const wchar_t* valuename, DWORD type, [in, size_is(size)] const void* data, DWORD size);
+
+    HRESULT FillSnow(byte color_index, INT x, INT y, UINT width, UINT height, UINT pitch, [out, size_is(height * pitch)] byte* pixels);
 }

dist/wcdx/src/wcdx.cpp

@@ -13,6 +13,7 @@
 #include <algorithm>
 #include <iterator>
 #include <limits>
+#include <random>
 #include <system_error>
 
 #include <io.h>
@@ -38,6 +39,8 @@ namespace
     HRESULT GetLocalAppDataPath(LPCWSTR subdir, LPWSTR path);
 
     bool CreateDirectoryRecursive(LPWSTR pathName);
+
+    std::independent_bits_engine<std::mt19937, 1, unsigned int> RandomBit(std::random_device{}());
 }
 
 WCDXAPI IWcdx* WcdxCreate(LPCWSTR windowTitle, WNDPROC windowProc, BOOL _fullScreen)
@@ -556,6 +559,19 @@ HRESULT STDMETHODCALLTYPE Wcdx::SetValue(const wchar_t* keyname, const wchar_t*
     return HRESULT_FROM_WIN32(error);
 }
 
+HRESULT STDMETHODCALLTYPE Wcdx::FillSnow(byte color_index, INT x, INT y, UINT width, UINT height, UINT pitch, byte* pixels)
+{
+    for (UINT h = 0; h != height; ++h)
+    {
+        auto p = pixels + (y * pitch) + x;
+        for (UINT w = 0; w != width; ++w)
+            *p++ = byte(RandomBit() * color_index);
+        ++y;
+    }
+
+    return S_OK;
+}
+
 ATOM Wcdx::FrameWindowClass()
 {
     static const ATOM windowClass = []

dist/wcdx/src/wcdx.h

@@ -63,6 +63,8 @@ class Wcdx : public IWcdx
     HRESULT STDMETHODCALLTYPE QueryValue(const wchar_t* keyname, const wchar_t* valuename, void* data, DWORD* size) override;
     HRESULT STDMETHODCALLTYPE SetValue(const wchar_t* keyname, const wchar_t* valuename, DWORD type, const void* data, DWORD size) override;
 
+    HRESULT STDMETHODCALLTYPE FillSnow(byte color_index, INT x, INT y, UINT width, UINT height, UINT pitch, byte* pixels) override;
+
 private:
     static ATOM FrameWindowClass();
     static LRESULT CALLBACK FrameWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);

dist/wcpatch/res/SM1.dif

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