Code refactor: move OIIO image buffer writing outside session, into callback.

Original patch by Guillaume, modifications by Brecht.

Differential Revision: https://developer.blender.org/D3102

intern/cycles/render/buffers.cpp

@@ -21,7 +21,6 @@
 
 #include "util/util_foreach.h"
 #include "util/util_hash.h"
-#include "util/util_image.h"
 #include "util/util_math.h"
 #include "util/util_opengl.h"
 #include "util/util_time.h"
@@ -448,37 +447,5 @@ bool DisplayBuffer::draw_ready()
 	return (draw_width != 0 && draw_height != 0);
 }
 
-void DisplayBuffer::write(const string& filename)
-{
-	int w = draw_width;
-	int h = draw_height;
-
-	if(w == 0 || h == 0)
-		return;
-	
-	if(half_float)
-		return;
-
-	/* read buffer from device */
-	uchar4 *pixels = rgba_byte.copy_from_device(0, w, h);
-
-	/* write image */
-	ImageOutput *out = ImageOutput::create(filename);
-	ImageSpec spec(w, h, 4, TypeDesc::UINT8);
-
-	out->open(filename, spec);
-
-	/* conversion for different top/bottom convention */
-	out->write_image(TypeDesc::UINT8,
-		(uchar*)(pixels + (h-1)*w),
-		AutoStride,
-		-w*sizeof(uchar4),
-		AutoStride);
-
-	out->close();
-
-	delete out;
-}
-
 CCL_NAMESPACE_END