Add RGBX BGRX support to WEBPImportPicture

third_party/libwebp/enc/picture.c

Index: third_party/libwebp/enc/picture.c
diff --git a/third_party/libwebp/enc/picture.c b/third_party/libwebp/enc/picture.c
index 2f3c96e8ef0f3082abc6029826627f29c74aa650..56ff85f3621a03c9a842cab9a06bc32dc7d00dab 100644
--- a/third_party/libwebp/enc/picture.c
+++ b/third_party/libwebp/enc/picture.c
@@ -593,6 +593,20 @@ int WebPPictureImportBGRA(WebPPicture* const picture,
   return Import(picture, rgba, rgba_stride, 4, 1, 1);
 }
 
+int WebPPictureImportRGBX(WebPPicture* const picture,
+                          const uint8_t* const rgba, int rgba_stride) {
+  picture->colorspace &= ~WEBP_CSP_ALPHA_BIT;
+  if (!WebPPictureAlloc(picture)) return 0;
+  return Import(picture, rgba, rgba_stride, 4, 0, 0);
+}
+
+int WebPPictureImportBGRX(WebPPicture* const picture,
+                          const uint8_t* const rgba, int rgba_stride) {
+  picture->colorspace &= ~WEBP_CSP_ALPHA_BIT;
+  if (!WebPPictureAlloc(picture)) return 0;
+  return Import(picture, rgba, rgba_stride, 4, 1, 0);
+}
+
 //------------------------------------------------------------------------------
 // Simplest call: