Baseline of hwcplus package taken from KitKat AOSP.

third_party/hwcplus/include/hardware/fb.h

Index: third_party/hwcplus/include/hardware/fb.h
diff --git a/third_party/hwcplus/include/hardware/fb.h b/third_party/hwcplus/include/hardware/fb.h
new file mode 100644
index 0000000000000000000000000000000000000000..135e4aa39926c8fa78e0edeec7fb73331a32427e
--- /dev/null
+++ b/third_party/hwcplus/include/hardware/fb.h
@@ -0,0 +1,167 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#ifndef ANDROID_FB_INTERFACE_H
+#define ANDROID_FB_INTERFACE_H
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#include <cutils/native_handle.h>
+
+#include <hardware/hardware.h>
+
+__BEGIN_DECLS
+
+#define GRALLOC_HARDWARE_FB0 "fb0"
+
+/*****************************************************************************/
+
+
+/*****************************************************************************/
+
+typedef struct framebuffer_device_t {
+    struct hw_device_t common;
+
+    /* flags describing some attributes of the framebuffer */
+    const uint32_t  flags;
+
+    /* dimensions of the framebuffer in pixels */
+    const uint32_t  width;
+    const uint32_t  height;
+
+    /* frambuffer stride in pixels */
+    const int       stride;
+
+    /* framebuffer pixel format */
+    const int       format;
+
+    /* resolution of the framebuffer's display panel in pixel per inch*/
+    const float     xdpi;
+    const float     ydpi;
+
+    /* framebuffer's display panel refresh rate in frames per second */
+    const float     fps;
+
+    /* min swap interval supported by this framebuffer */
+    const int       minSwapInterval;
+
+    /* max swap interval supported by this framebuffer */
+    const int       maxSwapInterval;
+
+    /* Number of framebuffers supported*/
+    const int       numFramebuffers;
+
+    int reserved[7];
+
+    /*
+     * requests a specific swap-interval (same definition than EGL)
+     *
+     * Returns 0 on success or -errno on error.
+     */
+    int (*setSwapInterval)(struct framebuffer_device_t* window,
+            int interval);
+
+    /*
+     * This hook is OPTIONAL.
+     *
+     * It is non NULL If the framebuffer driver supports "update-on-demand"
+     * and the given rectangle is the area of the screen that gets
+     * updated during (*post)().
+     *
+     * This is useful on devices that are able to DMA only a portion of
+     * the screen to the display panel, upon demand -- as opposed to
+     * constantly refreshing the panel 60 times per second, for instance.
+     *
+     * Only the area defined by this rectangle is guaranteed to be valid, that
+     * is, the driver is not allowed to post anything outside of this
+     * rectangle.
+     *
+     * The rectangle evaluated during (*post)() and specifies which area
+     * of the buffer passed in (*post)() shall to be posted.
+     *
+     * return -EINVAL if width or height <=0, or if left or top < 0
+     */
+    int (*setUpdateRect)(struct framebuffer_device_t* window,
+            int left, int top, int width, int height);
+
+    /*
+     * Post <buffer> to the display (display it on the screen)
+     * The buffer must have been allocated with the
+     *   GRALLOC_USAGE_HW_FB usage flag.
+     * buffer must be the same width and height as the display and must NOT
+     * be locked.
+     *
+     * The buffer is shown during the next VSYNC.
+     *
+     * If the same buffer is posted again (possibly after some other buffer),
+     * post() will block until the the first post is completed.
+     *
+     * Internally, post() is expected to lock the buffer so that a
+     * subsequent call to gralloc_module_t::(*lock)() with USAGE_RENDER or
+     * USAGE_*_WRITE will block until it is safe; that is typically once this
+     * buffer is shown and another buffer has been posted.
+     *
+     * Returns 0 on success or -errno on error.
+     */
+    int (*post)(struct framebuffer_device_t* dev, buffer_handle_t buffer);
+
+
+    /*
+     * The (*compositionComplete)() method must be called after the
+     * compositor has finished issuing GL commands for client buffers.
+     */
+
+    int (*compositionComplete)(struct framebuffer_device_t* dev);
+
+    /*
+     * This hook is OPTIONAL.
+     *
+     * If non NULL it will be caused by SurfaceFlinger on dumpsys
+     */
+    void (*dump)(struct framebuffer_device_t* dev, char *buff, int buff_len);
+
+    /*
+     * (*enableScreen)() is used to either blank (enable=0) or
+     * unblank (enable=1) the screen this framebuffer is attached to.
+     *
+     * Returns 0 on success or -errno on error.
+     */
+    int (*enableScreen)(struct framebuffer_device_t* dev, int enable);
+
+    void* reserved_proc[6];
+
+} framebuffer_device_t;
+
+
+/** convenience API for opening and closing a supported device */
+
+static inline int framebuffer_open(const struct hw_module_t* module,
+        struct framebuffer_device_t** device) {
+    return module->methods->open(module,
+            GRALLOC_HARDWARE_FB0, (struct hw_device_t**)device);
+}
+
+static inline int framebuffer_close(struct framebuffer_device_t* device) {
+    return device->common.close(&device->common);
+}
+
+
+__END_DECLS
+
+#endif  // ANDROID_FB_INTERFACE_H