am d870703d: fix external displays

        // no HWC, we call eglSwapBuffers()

        eglSwapBuffers(mDisplay, mSurface);

    } else {

        // We have a valid HWC, but not all displays can use it, in particular

        // the virtual displays are on their own.

        // TODO: HWC 1.2 will allow virtual displays

        if (mType >= DisplayDevice::DISPLAY_VIRTUAL) {

            // always call eglSwapBuffers() for virtual displays

            eglSwapBuffers(mDisplay, mSurface);

        } else if (hwc.supportsFramebufferTarget()) {

            // as of hwc 1.1 we always call eglSwapBuffers if we have some

            // GLES layers

            if (hwc.hasGlesComposition(mType)) {

            if (hwc.supportsFramebufferTarget() ||

                    mType >= DisplayDevice::DISPLAY_VIRTUAL) {

                // as of hwc 1.1 we always call eglSwapBuffers, however,

                // on older versions of HWC, we need to call it only on

                // virtual displays

                eglSwapBuffers(mDisplay, mSurface);

            }

        } else {

            // HWC doesn't have the framebuffer target, we don't call

            // eglSwapBuffers(), since this is handled by HWComposer::commit().

        }

    }

}