gdi32: Return bitmask for 32-bit bitmaps too in GetDIBits.

dlls/gdi32/dib.c

@@ -640,19 +640,17 @@ INT WINAPI GetDIBits(
                 DIB_GetDIBImageBytes( bmp->bitmap.bmWidth,
                                       bmp->bitmap.bmHeight,
                                       bmp->bitmap.bmBitsPixel );
+            info->bmiHeader.biCompression = (bmp->bitmap.bmBitsPixel > 8) ? BI_BITFIELDS : BI_RGB;
             switch(bmp->bitmap.bmBitsPixel)
             {
             case 15:
                 info->bmiHeader.biBitCount = 16;
-                info->bmiHeader.biCompression = BI_RGB;
                 break;
-            case 16:
-                info->bmiHeader.biBitCount = 16;
-                info->bmiHeader.biCompression = BI_BITFIELDS;
+            case 24:
+                info->bmiHeader.biBitCount = 32;
                 break;
             default:
                 info->bmiHeader.biBitCount = bmp->bitmap.bmBitsPixel;
-                info->bmiHeader.biCompression = BI_RGB;
                 break;
             }
             info->bmiHeader.biXPelsPerMeter = 0;
@@ -824,6 +822,16 @@ INT WINAPI GetDIBits(
             ((PDWORD)info->bmiColors)[2] = 0x001f;
         }
         break;
+
+    case 24:
+    case 32:
+        if (info->bmiHeader.biCompression == BI_BITFIELDS)
+        {
+            ((PDWORD)info->bmiColors)[0] = 0xff0000;
+            ((PDWORD)info->bmiColors)[1] = 0x00ff00;
+            ((PDWORD)info->bmiColors)[2] = 0x0000ff;
+        }
+        break;
     }
 
     if (bits && lines)

dlls/gdi32/tests/bitmap.c

@@ -1623,11 +1623,13 @@ static void test_GetDIBits_BI_BITFIELDS(void)
     /* Call GetDIBits to fill in bmiHeader.  */
     ret = GetDIBits(hdc, hbm, 0, 1, NULL, dibinfo, DIB_RGB_COLORS);
     ok(ret == 1, "GetDIBits failed\n");
-    if (dibinfo->bmiHeader.biBitCount == 16 &&
-        dibinfo->bmiHeader.biCompression == BI_BITFIELDS)
+    if (dibinfo->bmiHeader.biBitCount > 8)
     {
         DWORD *bitmasks = (DWORD *)dibinfo->bmiColors;
 
+        ok( dibinfo->bmiHeader.biCompression == BI_BITFIELDS,
+            "compression is %u\n", dibinfo->bmiHeader.biCompression );
+
         ok( !bitmasks[0], "red mask is set\n" );
         ok( !bitmasks[1], "green mask is set\n" );
         ok( !bitmasks[2], "blue mask is set\n" );