Add RGBX BGRX support to WEBPImportPicture

third_party/libwebp/webp/encode.h

Index: third_party/libwebp/webp/encode.h
diff --git a/third_party/libwebp/webp/encode.h b/third_party/libwebp/webp/encode.h
index 31f0539750faa6dc935348bef4cee239ef55c9be..8eac8ef92110d60ff5dfc2732b7677ddec90236e 100644
--- a/third_party/libwebp/webp/encode.h
+++ b/third_party/libwebp/webp/encode.h
@@ -252,12 +252,17 @@ WEBP_EXTERN(int) WebPPictureImportRGB(
 // Same, but for RGBA buffer
 WEBP_EXTERN(int) WebPPictureImportRGBA(
     WebPPicture* const picture, const uint8_t* const rgba, int rgba_stride);
+// Same again, RGBA buffer, ignoring the alpha channel

[skal, 2012/06/04 04:34:55]

you can add a comment about why this is useful compared to
WebPPictureImportRGBA. Something like:
"useful when input is totally opaque, but one want to retain the 32-bit packed
layout and avoid converting to 24-bit RGB".

+WEBP_EXTERN(int) WebPPictureImportRGBX(
+    WebPPicture* const picture, const uint8_t* const rgbx, int rgbx_stride);
 
-// Variant of the above, but taking BGR(A) input:
+// Variant of the above, but taking BGR(A) input
 WEBP_EXTERN(int) WebPPictureImportBGR(
     WebPPicture* const picture, const uint8_t* const bgr, int bgr_stride);
 WEBP_EXTERN(int) WebPPictureImportBGRA(
     WebPPicture* const picture, const uint8_t* const bgra, int bgra_stride);
+WEBP_EXTERN(int) WebPPictureImportBGRX(
+    WebPPicture* const picture, const uint8_t* const bgrx, int bgrx_stride);
 
 //------------------------------------------------------------------------------
 // Main call