2 * Copyright (C) 2008 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #ifndef ANDROID_GRALLOC_INTERFACE_H
19 #define ANDROID_GRALLOC_INTERFACE_H
21 #include <cutils/native_handle.h>
23 #include <hardware/hardware.h>
26 #include <sys/cdefs.h>
27 #include <sys/types.h>
31 #define GRALLOC_API_VERSION 1
34 * The id of this module
36 #define GRALLOC_HARDWARE_MODULE_ID "gralloc"
39 * Name of the graphics device to open
42 #define GRALLOC_HARDWARE_FB0 "fb0"
43 #define GRALLOC_HARDWARE_GPU0 "gpu0"
46 /* buffer is never read in software */
47 GRALLOC_USAGE_SW_READ_NEVER = 0x00000000,
48 /* buffer is rarely read in software */
49 GRALLOC_USAGE_SW_READ_RARELY = 0x00000002,
50 /* buffer is often read in software */
51 GRALLOC_USAGE_SW_READ_OFTEN = 0x00000003,
52 /* mask for the software read values */
53 GRALLOC_USAGE_SW_READ_MASK = 0x0000000F,
55 /* buffer is never written in software */
56 GRALLOC_USAGE_SW_WRITE_NEVER = 0x00000000,
57 /* buffer is never written in software */
58 GRALLOC_USAGE_SW_WRITE_RARELY = 0x00000020,
59 /* buffer is never written in software */
60 GRALLOC_USAGE_SW_WRITE_OFTEN = 0x00000030,
61 /* mask for the software write values */
62 GRALLOC_USAGE_SW_WRITE_MASK = 0x000000F0,
64 /* buffer will be used as an OpenGL ES texture */
65 GRALLOC_USAGE_HW_TEXTURE = 0x00000100,
66 /* buffer will be used as an OpenGL ES render target */
67 GRALLOC_USAGE_HW_RENDER = 0x00000200,
68 /* buffer will be used by the 2D hardware blitter */
69 GRALLOC_USAGE_HW_2D = 0x00000400,
70 /* buffer will be used with the framebuffer device */
71 GRALLOC_USAGE_HW_FB = 0x00001000,
72 /* mask for the software usage bit-mask */
73 GRALLOC_USAGE_HW_MASK = 0x00001F00,
75 /* buffer should be displayed full-screen on an external display when
78 GRALLOC_USAGE_EXTERNAL_DISP = 0x00002000,
80 /* Must have a hardware-protected path to external display sink for
81 * this buffer. If a hardware-protected path is not available, then
82 * either don't composite only this buffer (preferred) to the
83 * external sink, or (less desirable) do not route the entire
84 * composition to the external sink.
86 GRALLOC_USAGE_PROTECTED = 0x00004000,
88 /* implementation-specific private usage flags */
89 GRALLOC_USAGE_PRIVATE_0 = 0x10000000,
90 GRALLOC_USAGE_PRIVATE_1 = 0x20000000,
91 GRALLOC_USAGE_PRIVATE_2 = 0x40000000,
92 GRALLOC_USAGE_PRIVATE_3 = 0x80000000,
93 GRALLOC_USAGE_PRIVATE_MASK = 0xF0000000,
96 /*****************************************************************************/
98 typedef const native_handle* buffer_handle_t;
101 /* FIXME: this only exists to work-around some issues with
102 * the video and camera frameworks. don't implement unless
103 * you know what you're doing.
105 GRALLOC_MODULE_PERFORM_CREATE_HANDLE_FROM_BUFFER = 0x080000001,
107 GRALLOC_MODULE_PERFORM_GET_DRM_FD = 0x080000002,
108 GRALLOC_MODULE_PERFORM_GET_DRM_MAGIC = 0x080000003,
109 GRALLOC_MODULE_PERFORM_AUTH_DRM_MAGIC = 0x080000004,
111 GRALLOC_MODULE_PERFORM_ENTER_VT = 0x080000005,
112 GRALLOC_MODULE_PERFORM_LEAVE_VT = 0x080000006,
116 * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
117 * and the fields of this data structure must begin with hw_module_t
118 * followed by module specific information.
120 typedef struct gralloc_module_t {
121 struct hw_module_t common;
124 * (*registerBuffer)() must be called before a buffer_handle_t that has not
125 * been created with (*alloc_device_t::alloc)() can be used.
127 * This is intended to be used with buffer_handle_t's that have been
128 * received in this process through IPC.
130 * This function checks that the handle is indeed a valid one and prepares
131 * it for use with (*lock)() and (*unlock)().
133 * It is not necessary to call (*registerBuffer)() on a handle created
134 * with (*alloc_device_t::alloc)().
136 * returns an error if this buffer_handle_t is not valid.
138 int (*registerBuffer)(struct gralloc_module_t const* module,
139 buffer_handle_t handle);
142 * (*unregisterBuffer)() is called once this handle is no longer needed in
143 * this process. After this call, it is an error to call (*lock)(),
144 * (*unlock)(), or (*registerBuffer)().
146 * This function doesn't close or free the handle itself; this is done
147 * by other means, usually through libcutils's native_handle_close() and
148 * native_handle_free().
150 * It is an error to call (*unregisterBuffer)() on a buffer that wasn't
151 * explicitly registered first.
153 int (*unregisterBuffer)(struct gralloc_module_t const* module,
154 buffer_handle_t handle);
157 * The (*lock)() method is called before a buffer is accessed for the
158 * specified usage. This call may block, for instance if the h/w needs
159 * to finish rendering or if CPU caches need to be synchronized.
161 * The caller promises to modify only pixels in the area specified
164 * The content of the buffer outside of the specified area is NOT modified
167 * If usage specifies GRALLOC_USAGE_SW_*, vaddr is filled with the address
168 * of the buffer in virtual memory.
170 * THREADING CONSIDERATIONS:
172 * It is legal for several different threads to lock a buffer from
173 * read access, none of the threads are blocked.
175 * However, locking a buffer simultaneously for write or read/write is
177 * - shall not result in termination of the process
178 * - shall not block the caller
179 * It is acceptable to return an error or to leave the buffer's content
180 * into an indeterminate state.
182 * If the buffer was created with a usage mask incompatible with the
183 * requested usage flags here, -EINVAL is returned.
187 int (*lock)(struct gralloc_module_t const* module,
188 buffer_handle_t handle, int usage,
189 int l, int t, int w, int h,
194 * The (*unlock)() method must be called after all changes to the buffer
198 int (*unlock)(struct gralloc_module_t const* module,
199 buffer_handle_t handle);
202 /* reserved for future use */
203 int (*perform)(struct gralloc_module_t const* module,
204 int operation, ... );
206 /* reserved for future use */
207 void* reserved_proc[7];
210 /*****************************************************************************/
213 * Every device data structure must begin with hw_device_t
214 * followed by module specific public methods and attributes.
217 typedef struct alloc_device_t {
218 struct hw_device_t common;
221 * (*alloc)() Allocates a buffer in graphic memory with the requested
222 * parameters and returns a buffer_handle_t and the stride in pixels to
223 * allow the implementation to satisfy hardware constraints on the width
224 * of a pixmap (eg: it may have to be multiple of 8 pixels).
225 * The CALLER TAKES OWNERSHIP of the buffer_handle_t.
227 * Returns 0 on success or -errno on error.
230 int (*alloc)(struct alloc_device_t* dev,
231 int w, int h, int format, int usage,
232 buffer_handle_t* handle, int* stride);
235 * (*free)() Frees a previously allocated buffer.
236 * Behavior is undefined if the buffer is still mapped in any process,
237 * but shall not result in termination of the program or security breaches
238 * (allowing a process to get access to another process' buffers).
239 * THIS FUNCTION TAKES OWNERSHIP of the buffer_handle_t which becomes
240 * invalid after the call.
242 * Returns 0 on success or -errno on error.
244 int (*free)(struct alloc_device_t* dev,
245 buffer_handle_t handle);
247 /* This hook is OPTIONAL.
249 * If non NULL it will be caused by SurfaceFlinger on dumpsys
251 void (*dump)(struct alloc_device_t *dev, char *buff, int buff_len);
253 void* reserved_proc[7];
257 typedef struct framebuffer_device_t {
258 struct hw_device_t common;
260 /* flags describing some attributes of the framebuffer */
261 const uint32_t flags;
263 /* dimensions of the framebuffer in pixels */
264 const uint32_t width;
265 const uint32_t height;
267 /* frambuffer stride in pixels */
270 /* framebuffer pixel format */
273 /* resolution of the framebuffer's display panel in pixel per inch*/
277 /* framebuffer's display panel refresh rate in frames per second */
280 /* min swap interval supported by this framebuffer */
281 const int minSwapInterval;
283 /* max swap interval supported by this framebuffer */
284 const int maxSwapInterval;
289 * requests a specific swap-interval (same definition than EGL)
291 * Returns 0 on success or -errno on error.
293 int (*setSwapInterval)(struct framebuffer_device_t* window,
297 * This hook is OPTIONAL.
299 * It is non NULL If the framebuffer driver supports "update-on-demand"
300 * and the given rectangle is the area of the screen that gets
301 * updated during (*post)().
303 * This is useful on devices that are able to DMA only a portion of
304 * the screen to the display panel, upon demand -- as opposed to
305 * constantly refreshing the panel 60 times per second, for instance.
307 * Only the area defined by this rectangle is guaranteed to be valid, that
308 * is, the driver is not allowed to post anything outside of this
311 * The rectangle evaluated during (*post)() and specifies which area
312 * of the buffer passed in (*post)() shall to be posted.
314 * return -EINVAL if width or height <=0, or if left or top < 0
316 int (*setUpdateRect)(struct framebuffer_device_t* window,
317 int left, int top, int width, int height);
320 * Post <buffer> to the display (display it on the screen)
321 * The buffer must have been allocated with the
322 * GRALLOC_USAGE_HW_FB usage flag.
323 * buffer must be the same width and height as the display and must NOT
326 * The buffer is shown during the next VSYNC.
328 * If the same buffer is posted again (possibly after some other buffer),
329 * post() will block until the the first post is completed.
331 * Internally, post() is expected to lock the buffer so that a
332 * subsequent call to gralloc_module_t::(*lock)() with USAGE_RENDER or
333 * USAGE_*_WRITE will block until it is safe; that is typically once this
334 * buffer is shown and another buffer has been posted.
336 * Returns 0 on success or -errno on error.
338 int (*post)(struct framebuffer_device_t* dev, buffer_handle_t buffer);
342 * The (*compositionComplete)() method must be called after the
343 * compositor has finished issuing GL commands for client buffers.
346 int (*compositionComplete)(struct framebuffer_device_t* dev);
349 * This hook is OPTIONAL.
351 * If non NULL it will be caused by SurfaceFlinger on dumpsys
353 void (*dump)(struct framebuffer_device_t* dev, char *buff, int buff_len);
355 void* reserved_proc[7];
357 } framebuffer_device_t;
360 /** convenience API for opening and closing a supported device */
362 static inline int gralloc_open(const struct hw_module_t* module,
363 struct alloc_device_t** device) {
364 return module->methods->open(module,
365 GRALLOC_HARDWARE_GPU0, (struct hw_device_t**)device);
368 static inline int gralloc_close(struct alloc_device_t* device) {
369 return device->common.close(&device->common);
373 static inline int framebuffer_open(const struct hw_module_t* module,
374 struct framebuffer_device_t** device) {
375 return module->methods->open(module,
376 GRALLOC_HARDWARE_FB0, (struct hw_device_t**)device);
379 static inline int framebuffer_close(struct framebuffer_device_t* device) {
380 return device->common.close(&device->common);
386 #endif // ANDROID_ALLOC_INTERFACE_H