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* Copyright (C) 2008 The Android Open Source Project
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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#ifndef ANDROID_FB_INTERFACE_H
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#define ANDROID_FB_INTERFACE_H
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <android/version.h>
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#include <android/cutils/native_handle.h>
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#include <android/hardware/hardware.h>
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#define GRALLOC_HARDWARE_FB0 "fb0"
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/*****************************************************************************/
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/*****************************************************************************/
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typedef struct framebuffer_device_t {
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struct hw_device_t common;
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/* flags describing some attributes of the framebuffer */
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/* dimensions of the framebuffer in pixels */
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const uint32_t height;
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/* frambuffer stride in pixels */
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/* framebuffer pixel format */
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/* resolution of the framebuffer's display panel in pixel per inch*/
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/* framebuffer's display panel refresh rate in frames per second */
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/* min swap interval supported by this framebuffer */
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const int minSwapInterval;
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/* max swap interval supported by this framebuffer */
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const int maxSwapInterval;
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#if defined(ANDROID_VERSION) && ANDROID_VERSION>=0x410
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/* Number of framebuffers supported*/
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const int numFramebuffers;
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* requests a specific swap-interval (same definition than EGL)
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* Returns 0 on success or -errno on error.
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int (*setSwapInterval)(struct framebuffer_device_t* window,
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* This hook is OPTIONAL.
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* It is non NULL If the framebuffer driver supports "update-on-demand"
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* and the given rectangle is the area of the screen that gets
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* updated during (*post)().
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* This is useful on devices that are able to DMA only a portion of
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* the screen to the display panel, upon demand -- as opposed to
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* constantly refreshing the panel 60 times per second, for instance.
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* Only the area defined by this rectangle is guaranteed to be valid, that
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* is, the driver is not allowed to post anything outside of this
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* The rectangle evaluated during (*post)() and specifies which area
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* of the buffer passed in (*post)() shall to be posted.
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* return -EINVAL if width or height <=0, or if left or top < 0
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int (*setUpdateRect)(struct framebuffer_device_t* window,
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int left, int top, int width, int height);
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* Post <buffer> to the display (display it on the screen)
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* The buffer must have been allocated with the
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* GRALLOC_USAGE_HW_FB usage flag.
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* buffer must be the same width and height as the display and must NOT
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* The buffer is shown during the next VSYNC.
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* If the same buffer is posted again (possibly after some other buffer),
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* post() will block until the the first post is completed.
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* Internally, post() is expected to lock the buffer so that a
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* subsequent call to gralloc_module_t::(*lock)() with USAGE_RENDER or
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* USAGE_*_WRITE will block until it is safe; that is typically once this
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* buffer is shown and another buffer has been posted.
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* Returns 0 on success or -errno on error.
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int (*post)(struct framebuffer_device_t* dev, buffer_handle_t buffer);
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* The (*compositionComplete)() method must be called after the
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* compositor has finished issuing GL commands for client buffers.
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int (*compositionComplete)(struct framebuffer_device_t* dev);
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* This hook is OPTIONAL.
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* If non NULL it will be caused by SurfaceFlinger on dumpsys
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void (*dump)(struct framebuffer_device_t* dev, char *buff, int buff_len);
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* (*enableScreen)() is used to either blank (enable=0) or
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* unblank (enable=1) the screen this framebuffer is attached to.
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* Returns 0 on success or -errno on error.
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int (*enableScreen)(struct framebuffer_device_t* dev, int enable);
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void* reserved_proc[6];
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} framebuffer_device_t;
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/** convenience API for opening and closing a supported device */
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static inline int framebuffer_open(const struct hw_module_t* module,
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struct framebuffer_device_t** device) {
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return module->methods->open(module,
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GRALLOC_HARDWARE_FB0, (struct hw_device_t**)device);
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static inline int framebuffer_close(struct framebuffer_device_t* device) {
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return device->common.close(&device->common);
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#endif // ANDROID_FB_INTERFACE_H
added
removed
hybris/include/android/hardware/fb.h
