Image via Gizmo China Oppo has announced a new mid-range smartphone for the Philippine market, featuring a metal frame and a striking diamond-style pattern on the rear panel underneath a sheet of glass. The Oppo R1x, which retails for P15,990 locally, also crams many high-performance specs in a thin-and-light package. In many ways, it’s similar to the more expensive R5, formerly the thinnest smartphone money can buy, except it’s got more thickness (6.9mm) but less heft (130 grams). Powering the R1x is, coincidentally, the same chip inside the R5: a 64-bit, LTE-ready Qualcomm Snapdragon 615 processor backed by 2GB of …