swscale/tests/swscale: Implement isALPHA() using AVPixFmtDescriptor

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libswscale/tests/swscale.c

@@ -48,12 +48,12 @@
     (!(isGray(x)                ||     \
        (x) == AV_PIX_FMT_MONOBLACK ||     \
        (x) == AV_PIX_FMT_MONOWHITE))
-#define isALPHA(x)                     \
+
-    ((x) == AV_PIX_FMT_BGR32   ||         \
+static av_always_inline int isALPHA(enum AVPixelFormat pix_fmt)
-     (x) == AV_PIX_FMT_BGR32_1 ||         \
+{
-     (x) == AV_PIX_FMT_RGB32   ||         \
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
-     (x) == AV_PIX_FMT_RGB32_1 ||         \
+    return desc->flags & AV_PIX_FMT_FLAG_ALPHA;
-     (x) == AV_PIX_FMT_YUVA420P)
+}
 
 static uint64_t getSSD(const uint8_t *src1, const uint8_t *src2,
                        int stride1, int stride2, int w, int h)