+/**
+ * Return the address of a pixel value in a mapped renderbuffer.
+ */
+static inline GLubyte *
+_swrast_pixel_address(struct gl_renderbuffer *rb, GLint x, GLint y)
+{
+ struct swrast_renderbuffer *srb = swrast_renderbuffer(rb);
+ const GLint bpp = _mesa_get_format_bytes(rb->Format);
+ const GLint rowStride = srb->RowStride;
+ assert(x >= 0);
+ assert(y >= 0);
+ /* NOTE: using <= only because of s_tritemp.h which gets a pixel
+ * address but doesn't necessarily access it.
+ */
+ assert(x <= (GLint) rb->Width);
+ assert(y <= (GLint) rb->Height);
+ assert(srb->Map);
+ return (GLubyte *) srb->Map + y * rowStride + x * bpp;
+}
+
+