windowscodecs: Add support for generating WICBitmapPaletteTypeFixedHalftone252 palette.

dlls/windowscodecs/palette.c

@@ -260,6 +260,27 @@ static WICColor *generate_halftone216_palette(UINT *count)
     return entries;
 }
 
+static WICColor *generate_halftone252_palette(UINT *count)
+{
+    WICColor *entries;
+    UINT i;
+
+    *count = 252;
+    entries = HeapAlloc(GetProcessHeap(), 0, 252 * sizeof(WICColor));
+    if (!entries) return NULL;
+
+    for (i = 0; i < 252; i++)
+    {
+        static const BYTE halftone_values_rb[6] = { 0x00,0x33,0x66,0x99,0xcc,0xff };
+        static const BYTE halftone_values_g[7] = { 0x00,0x2b,0x55,0x80,0xaa,0xd5,0xff };
+        entries[i] = 0xff000000;
+        entries[i] |= halftone_values_rb[i%6];
+        entries[i] |= halftone_values_g[(i/6)%7] << 8;
+        entries[i] |= halftone_values_rb[(i/42)%6] << 16;
+    }
+    return entries;
+}
+
 static WICColor *generate_halftone256_palette(UINT *count)
 {
     WICColor *entries;
@@ -345,6 +366,11 @@ static HRESULT WINAPI PaletteImpl_InitializePredefined(IWICPalette *iface,
         if (!colors) return E_OUTOFMEMORY;
         break;
 
+    case WICBitmapPaletteTypeFixedHalftone252:
+        colors = generate_halftone252_palette(&count);
+        if (!colors) return E_OUTOFMEMORY;
+        break;
+
     case WICBitmapPaletteTypeFixedHalftone256:
         colors = generate_halftone256_palette(&count);
         if (!colors) return E_OUTOFMEMORY;

dlls/windowscodecs/tests/palette.c

@@ -283,6 +283,23 @@ static void generate_halftone216_palette(DWORD *entries, UINT count)
     }
 }
 
+static void generate_halftone252_palette(DWORD *entries, UINT count)
+{
+    static const BYTE halftone_values_rb[6] = { 0x00,0x33,0x66,0x99,0xcc,0xff };
+    static const BYTE halftone_values_g[7] = { 0x00,0x2b,0x55,0x80,0xaa,0xd5,0xff };
+    UINT i;
+
+    assert(count == 252);
+
+    for (i = 0; i < 252; i++)
+    {
+        entries[i] = 0xff000000;
+        entries[i] |= halftone_values_rb[i%6];
+        entries[i] |= halftone_values_g[(i/6)%7] << 8;
+        entries[i] |= halftone_values_rb[(i/42)%6] << 16;
+    }
+}
+
 static void generate_halftone256_palette(DWORD *entries, UINT count)
 {
     static const BYTE halftone_values_b[4] = { 0x00,0x55,0xaa,0xff };
@@ -320,6 +337,7 @@ static void test_predefined_palette(void)
         { WICBitmapPaletteTypeFixedHalftone64, 0, 0, 72, { 0 } },
         { WICBitmapPaletteTypeFixedHalftone125, 0, 0, 126, { 0 } },
         { WICBitmapPaletteTypeFixedHalftone216, 0, 0, 224, { 0 } },
+        { WICBitmapPaletteTypeFixedHalftone252, 0, 0, 252, { 0 } },
         { WICBitmapPaletteTypeFixedHalftone256, 0, 0, 256, { 0 } },
     };
     IWICImagingFactory *factory;
@@ -385,6 +403,8 @@ static void test_predefined_palette(void)
                 generate_halftone125_palette(td[i].color, td[i].count);
             else if (td[i].type == WICBitmapPaletteTypeFixedHalftone216)
                 generate_halftone216_palette(td[i].color, td[i].count);
+            else if (td[i].type == WICBitmapPaletteTypeFixedHalftone252)
+                generate_halftone252_palette(td[i].color, td[i].count);
             else if (td[i].type == WICBitmapPaletteTypeFixedHalftone256)
                 generate_halftone256_palette(td[i].color, td[i].count);