lib/intel_batchbuffer: igt_ namespace for the buffer structure

Step one to properly namespace the rendercpy/mediafill functions. Als
give the buf_height/width helpers a proper igt_ prefix.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/lib/media_fill_gen8.c b/lib/media_fill_gen8.c
index 1af3b3d..7e0a567 100644
--- a/lib/media_fill_gen8.c
+++ b/lib/media_fill_gen8.c
@@ -82,7 +82,7 @@
 
 static uint32_t
 gen8_fill_surface_state(struct intel_batchbuffer *batch,
-			struct scratch_buf *buf,
+			struct igt_buf *buf,
 			uint32_t format,
 			int is_dst)
 {
@@ -119,8 +119,8 @@
 				read_domain, write_domain);
 	assert(ret == 0);
 
-	ss->ss2.height = buf_height(buf) - 1;
-	ss->ss2.width  = buf_width(buf) - 1;
+	ss->ss2.height = igt_buf_height(buf) - 1;
+	ss->ss2.width  = igt_buf_width(buf) - 1;
 	ss->ss3.pitch  = buf->stride - 1;
 
 	ss->ss7.shader_chanel_select_r = 4;
@@ -133,7 +133,7 @@
 
 static uint32_t
 gen8_fill_binding_table(struct intel_batchbuffer *batch,
-			struct scratch_buf *dst)
+			struct igt_buf *dst)
 {
 	uint32_t *binding_table, offset;
 
@@ -158,7 +158,7 @@
 }
 
 static uint32_t
-gen8_fill_interface_descriptor(struct intel_batchbuffer *batch, struct scratch_buf *dst)
+gen8_fill_interface_descriptor(struct intel_batchbuffer *batch, struct igt_buf *dst)
 {
 	struct gen8_interface_descriptor_data *idd;
 	uint32_t offset;
@@ -334,7 +334,7 @@
 
 void
 gen8_media_fillfunc(struct intel_batchbuffer *batch,
-		struct scratch_buf *dst,
+		struct igt_buf *dst,
 		unsigned x, unsigned y,
 		unsigned width, unsigned height,
 		uint8_t color)