wined3d: Implement a R5G6B5 to X8R8G8B8 surface format converter.

dlls/wined3d/surface_base.c

@@ -702,6 +702,46 @@ static void convert_r32f_r16f(const BYTE *src, BYTE *dst, DWORD pitch_in, DWORD
     }
 }
 
+static void convert_r5g6b5_x8r8g8b8(const BYTE *src, BYTE *dst,
+        DWORD pitch_in, DWORD pitch_out, unsigned int w, unsigned int h)
+{
+    static const unsigned char convert_5to8[] =
+    {
+        0x00, 0x08, 0x10, 0x19, 0x21, 0x29, 0x31, 0x3a,
+        0x42, 0x4a, 0x52, 0x5a, 0x63, 0x6b, 0x73, 0x7b,
+        0x84, 0x8c, 0x94, 0x9c, 0xa5, 0xad, 0xb5, 0xbd,
+        0xc5, 0xce, 0xd6, 0xde, 0xe6, 0xef, 0xf7, 0xff,
+    };
+    static const unsigned char convert_6to8[] =
+    {
+        0x00, 0x04, 0x08, 0x0c, 0x10, 0x14, 0x18, 0x1c,
+        0x20, 0x24, 0x28, 0x2d, 0x31, 0x35, 0x39, 0x3d,
+        0x41, 0x45, 0x49, 0x4d, 0x51, 0x55, 0x59, 0x5d,
+        0x61, 0x65, 0x69, 0x6d, 0x71, 0x75, 0x79, 0x7d,
+        0x82, 0x86, 0x8a, 0x8e, 0x92, 0x96, 0x9a, 0x9e,
+        0xa2, 0xa6, 0xaa, 0xae, 0xb2, 0xb6, 0xba, 0xbe,
+        0xc2, 0xc6, 0xca, 0xce, 0xd2, 0xd7, 0xdb, 0xdf,
+        0xe3, 0xe7, 0xeb, 0xef, 0xf3, 0xf7, 0xfb, 0xff,
+    };
+    unsigned int x, y;
+
+    TRACE("Converting %ux%u pixels, pitches %u %u\n", w, h, pitch_in, pitch_out);
+
+    for (y = 0; y < h; ++y)
+    {
+        const WORD *src_line = (const WORD *)(src + y * pitch_in);
+        DWORD *dst_line = (DWORD *)(dst + y * pitch_out);
+        for (x = 0; x < w; ++x)
+        {
+            WORD pixel = src_line[x];
+            dst_line[x] = 0xff000000
+                    | convert_5to8[(pixel & 0xf800) >> 11] << 16
+                    | convert_6to8[(pixel & 0x07e0) >> 5] << 8
+                    | convert_5to8[(pixel & 0x001f)];
+        }
+    }
+}
+
 struct d3dfmt_convertor_desc {
     WINED3DFORMAT from, to;
     void (*convert)(const BYTE *src, BYTE *dst, DWORD pitch_in, DWORD pitch_out, unsigned int w, unsigned int h);
@@ -710,6 +750,7 @@ struct d3dfmt_convertor_desc {
 static const struct d3dfmt_convertor_desc convertors[] =
 {
     {WINED3DFMT_R32F,       WINED3DFMT_R16F,        convert_r32f_r16f},
+    {WINED3DFMT_R5G6B5,     WINED3DFMT_X8R8G8B8,    convert_r5g6b5_x8r8g8b8},
 };
 
 static inline const struct d3dfmt_convertor_desc *find_convertor(WINED3DFORMAT from, WINED3DFORMAT to)