rename yuv matrix constants to be more clear about what they are

include/libyuv/row.h

Index: include/libyuv/row.h
diff --git a/include/libyuv/row.h b/include/libyuv/row.h
index 08e1ff6425ab5f2c4bdac0fdaa4f7d69bc4102e7..d7bce4a3206d6033ac01d24c628761217121745d 100644
--- a/include/libyuv/row.h
+++ b/include/libyuv/row.h
@@ -447,9 +447,9 @@ struct YuvConstants {
 #endif
 
 // Conversion matrix for YUV to RGB
-extern const struct YuvConstants kYuvIConstants;  // BT.601
-extern const struct YuvConstants kYuvJConstants;  // JPeg color space
-extern const struct YuvConstants kYuvHConstants;  // BT.709
+extern const struct YuvConstants kYuvI601Constants;  // BT.601
+extern const struct YuvConstants kYuvJPEGConstants;  // JPeg color space
+extern const struct YuvConstants kYuvH709Constants;  // BT.709

[harryjin, 2015/11/03 19:56:57]

Silly question: H is for HD? What does I stand for?

[fbarchard, 2015/11/03 19:59:51]

Acknowledged.
Yes, H=HD.  The functions/fourcc use H420, H444 etc.  I needed a letter to
differentiate I420 from H420.
Its a full range bt 709.
The I420 is a video / studio range of BT.601
JPeg is a variation of full range BT.601.
These are internal constants, and the formulas described more in row_common.cc

 
 // Conversion matrix for YVU to BGR.
 extern const struct YuvConstants kYvuIConstants;  // BT.601

[harryjin, 2015/11/03 19:56:57]

What about these constants?

[fbarchard, 2015/11/03 19:59:51]

Done.