Update libwebp to 0.5.2

3 files changed, 4 insertions, 4 deletions

diff --git a/thirdparty/libwebp/dsp/dec.c b/thirdparty/libwebp/dsp/dec.c
index e92d693362..49bd16d976 100644
--- a/thirdparty/libwebp/dsp/dec.c
+++ b/thirdparty/libwebp/dsp/dec.c
@@ -239,7 +239,7 @@ VP8PredFunc VP8PredLuma16[NUM_B_DC_MODES];
 //------------------------------------------------------------------------------
 // 4x4
 
-#define AVG3(a, b, c) (((a) + 2 * (b) + (c) + 2) >> 2)
+#define AVG3(a, b, c) ((uint8_t)(((a) + 2 * (b) + (c) + 2) >> 2))
 #define AVG2(a, b) (((a) + (b) + 1) >> 1)
 
 static void VE4(uint8_t* dst) {    // vertical
diff --git a/thirdparty/libwebp/dsp/enc.c b/thirdparty/libwebp/dsp/enc.c
index f639f5570c..db0e9e70ae 100644
--- a/thirdparty/libwebp/dsp/enc.c
+++ b/thirdparty/libwebp/dsp/enc.c
@@ -335,7 +335,7 @@ static void Intra16Preds(uint8_t* dst,
 // luma 4x4 prediction
 
 #define DST(x, y) dst[(x) + (y) * BPS]
-#define AVG3(a, b, c) (((a) + 2 * (b) + (c) + 2) >> 2)
+#define AVG3(a, b, c) ((uint8_t)(((a) + 2 * (b) + (c) + 2) >> 2))
 #define AVG2(a, b) (((a) + (b) + 1) >> 1)
 
 static void VE4(uint8_t* dst, const uint8_t* top) {    // vertical
diff --git a/thirdparty/libwebp/dsp/rescaler.c b/thirdparty/libwebp/dsp/rescaler.c
index bc743d5dc5..f5b07756cf 100644
--- a/thirdparty/libwebp/dsp/rescaler.c
+++ b/thirdparty/libwebp/dsp/rescaler.c
@@ -173,10 +173,10 @@ void WebPRescalerExportRow(WebPRescaler* const wrk) {
       WebPRescalerExportRowExpand(wrk);
     } else if (wrk->fxy_scale) {
       WebPRescalerExportRowShrink(wrk);
-    } else {  // very special case for src = dst = 1x1
+    } else {  // special case
       int i;
+      assert(wrk->src_height == wrk->dst_height && wrk->x_add == 1);
       assert(wrk->src_width == 1 && wrk->dst_width <= 2);
-      assert(wrk->src_height == 1 && wrk->dst_height == 1);
       for (i = 0; i < wrk->num_channels * wrk->dst_width; ++i) {
         wrk->dst[i] = wrk->irow[i];
         wrk->irow[i] = 0;