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 <system/window.h>
22 #include <system/graphics.h>
23 #include <hardware/hardware.h>
26 #include <sys/cdefs.h>
27 #include <sys/types.h>
29 #include <cutils/native_handle.h>
31 #include <hardware/hardware.h>
32 #include <hardware/fb.h>
37 * Module versioning information for the Gralloc hardware module, based on
38 * gralloc_module_t.common.module_api_version.
42 * GRALLOC_MODULE_API_VERSION_0_1:
43 * Initial Gralloc hardware module API.
45 * GRALLOC_MODULE_API_VERSION_0_2:
46 * Add support for flexible YCbCr format with (*lock_ycbcr)() method.
49 #define GRALLOC_MODULE_API_VERSION_0_1 HARDWARE_MODULE_API_VERSION(0, 1)
50 #define GRALLOC_MODULE_API_VERSION_0_2 HARDWARE_MODULE_API_VERSION(0, 2)
52 #define GRALLOC_DEVICE_API_VERSION_0_1 HARDWARE_DEVICE_API_VERSION(0, 1)
55 * The id of this module
57 #define GRALLOC_HARDWARE_MODULE_ID "gralloc"
60 * Name of the graphics device to open
63 #define GRALLOC_HARDWARE_GPU0 "gpu0"
66 /* buffer is never read in software */
67 GRALLOC_USAGE_SW_READ_NEVER = 0x00000000,
68 /* buffer is rarely read in software */
69 GRALLOC_USAGE_SW_READ_RARELY = 0x00000002,
70 /* buffer is often read in software */
71 GRALLOC_USAGE_SW_READ_OFTEN = 0x00000003,
72 /* mask for the software read values */
73 GRALLOC_USAGE_SW_READ_MASK = 0x0000000F,
75 /* buffer is never written in software */
76 GRALLOC_USAGE_SW_WRITE_NEVER = 0x00000000,
77 /* buffer is rarely written in software */
78 GRALLOC_USAGE_SW_WRITE_RARELY = 0x00000020,
79 /* buffer is often written in software */
80 GRALLOC_USAGE_SW_WRITE_OFTEN = 0x00000030,
81 /* mask for the software write values */
82 GRALLOC_USAGE_SW_WRITE_MASK = 0x000000F0,
84 /* buffer will be used as an OpenGL ES texture */
85 GRALLOC_USAGE_HW_TEXTURE = 0x00000100,
86 /* buffer will be used as an OpenGL ES render target */
87 GRALLOC_USAGE_HW_RENDER = 0x00000200,
88 /* buffer will be used by the 2D hardware blitter */
89 GRALLOC_USAGE_HW_2D = 0x00000400,
90 /* buffer will be used by the HWComposer HAL module */
91 GRALLOC_USAGE_HW_COMPOSER = 0x00000800,
92 /* buffer will be used with the framebuffer device */
93 GRALLOC_USAGE_HW_FB = 0x00001000,
94 /* buffer will be used with the HW video encoder */
95 GRALLOC_USAGE_HW_VIDEO_ENCODER = 0x00010000,
96 /* buffer will be written by the HW camera pipeline */
97 GRALLOC_USAGE_HW_CAMERA_WRITE = 0x00020000,
98 /* buffer will be read by the HW camera pipeline */
99 GRALLOC_USAGE_HW_CAMERA_READ = 0x00040000,
100 /* buffer will be used as part of zero-shutter-lag queue */
101 GRALLOC_USAGE_HW_CAMERA_ZSL = 0x00060000,
102 /* mask for the camera access values */
103 GRALLOC_USAGE_HW_CAMERA_MASK = 0x00060000,
104 /* mask for the software usage bit-mask */
105 GRALLOC_USAGE_HW_MASK = 0x00071F00,
107 /* buffer should be displayed full-screen on an external display when
110 GRALLOC_USAGE_EXTERNAL_DISP = 0x00002000,
112 /* Must have a hardware-protected path to external display sink for
113 * this buffer. If a hardware-protected path is not available, then
114 * either don't composite only this buffer (preferred) to the
115 * external sink, or (less desirable) do not route the entire
116 * composition to the external sink.
118 GRALLOC_USAGE_PROTECTED = 0x00004000,
120 /* implementation-specific private usage flags */
121 GRALLOC_USAGE_PRIVATE_0 = 0x10000000,
122 GRALLOC_USAGE_PRIVATE_1 = 0x20000000,
123 GRALLOC_USAGE_PRIVATE_2 = 0x40000000,
124 GRALLOC_USAGE_PRIVATE_3 = 0x80000000,
125 GRALLOC_USAGE_PRIVATE_MASK = 0xF0000000,
128 /*****************************************************************************/
131 * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
132 * and the fields of this data structure must begin with hw_module_t
133 * followed by module specific information.
135 typedef struct gralloc_module_t {
136 struct hw_module_t common;
139 * (*registerBuffer)() must be called before a buffer_handle_t that has not
140 * been created with (*alloc_device_t::alloc)() can be used.
142 * This is intended to be used with buffer_handle_t's that have been
143 * received in this process through IPC.
145 * This function checks that the handle is indeed a valid one and prepares
146 * it for use with (*lock)() and (*unlock)().
148 * It is not necessary to call (*registerBuffer)() on a handle created
149 * with (*alloc_device_t::alloc)().
151 * returns an error if this buffer_handle_t is not valid.
153 int (*registerBuffer)(struct gralloc_module_t const* module,
154 buffer_handle_t handle);
157 * (*unregisterBuffer)() is called once this handle is no longer needed in
158 * this process. After this call, it is an error to call (*lock)(),
159 * (*unlock)(), or (*registerBuffer)().
161 * This function doesn't close or free the handle itself; this is done
162 * by other means, usually through libcutils's native_handle_close() and
163 * native_handle_free().
165 * It is an error to call (*unregisterBuffer)() on a buffer that wasn't
166 * explicitly registered first.
168 int (*unregisterBuffer)(struct gralloc_module_t const* module,
169 buffer_handle_t handle);
172 * The (*lock)() method is called before a buffer is accessed for the
173 * specified usage. This call may block, for instance if the h/w needs
174 * to finish rendering or if CPU caches need to be synchronized.
176 * The caller promises to modify only pixels in the area specified
179 * The content of the buffer outside of the specified area is NOT modified
182 * If usage specifies GRALLOC_USAGE_SW_*, vaddr is filled with the address
183 * of the buffer in virtual memory.
185 * Note calling (*lock)() on HAL_PIXEL_FORMAT_YCbCr_*_888 buffers will fail
186 * and return -EINVAL. These buffers must be locked with (*lock_ycbcr)()
189 * THREADING CONSIDERATIONS:
191 * It is legal for several different threads to lock a buffer from
192 * read access, none of the threads are blocked.
194 * However, locking a buffer simultaneously for write or read/write is
196 * - shall not result in termination of the process
197 * - shall not block the caller
198 * It is acceptable to return an error or to leave the buffer's content
199 * into an indeterminate state.
201 * If the buffer was created with a usage mask incompatible with the
202 * requested usage flags here, -EINVAL is returned.
206 int (*lock)(struct gralloc_module_t const* module,
207 buffer_handle_t handle, int usage,
208 int l, int t, int w, int h,
213 * The (*unlock)() method must be called after all changes to the buffer
217 int (*unlock)(struct gralloc_module_t const* module,
218 buffer_handle_t handle);
221 /* reserved for future use */
222 int (*perform)(struct gralloc_module_t const* module,
223 int operation, ... );
226 * The (*lock_ycbcr)() method is like the (*lock)() method, with the
227 * difference that it fills a struct ycbcr with a description of the buffer
228 * layout, and zeroes out the reserved fields.
230 * This will only work on buffers with HAL_PIXEL_FORMAT_YCbCr_*_888, and
231 * will return -EINVAL on any other buffer formats.
233 * Added in GRALLOC_MODULE_API_VERSION_0_2.
236 int (*lock_ycbcr)(struct gralloc_module_t const* module,
237 buffer_handle_t handle, int usage,
238 int l, int t, int w, int h,
239 struct android_ycbcr *ycbcr);
241 /* reserved for future use */
242 void* reserved_proc[6];
245 /*****************************************************************************/
248 * Every device data structure must begin with hw_device_t
249 * followed by module specific public methods and attributes.
252 typedef struct alloc_device_t {
253 struct hw_device_t common;
256 * (*alloc)() Allocates a buffer in graphic memory with the requested
257 * parameters and returns a buffer_handle_t and the stride in pixels to
258 * allow the implementation to satisfy hardware constraints on the width
259 * of a pixmap (eg: it may have to be multiple of 8 pixels).
260 * The CALLER TAKES OWNERSHIP of the buffer_handle_t.
262 * If format is HAL_PIXEL_FORMAT_YCbCr_420_888, the returned stride must be
263 * 0, since the actual strides are available from the android_ycbcr
266 * Returns 0 on success or -errno on error.
269 int (*alloc)(struct alloc_device_t* dev,
270 int w, int h, int format, int usage,
271 buffer_handle_t* handle, int* stride);
274 * (*free)() Frees a previously allocated buffer.
275 * Behavior is undefined if the buffer is still mapped in any process,
276 * but shall not result in termination of the program or security breaches
277 * (allowing a process to get access to another process' buffers).
278 * THIS FUNCTION TAKES OWNERSHIP of the buffer_handle_t which becomes
279 * invalid after the call.
281 * Returns 0 on success or -errno on error.
283 int (*free)(struct alloc_device_t* dev,
284 buffer_handle_t handle);
286 /* This hook is OPTIONAL.
288 * If non NULL it will be caused by SurfaceFlinger on dumpsys
290 void (*dump)(struct alloc_device_t *dev, char *buff, int buff_len);
292 void* reserved_proc[7];
296 /** convenience API for opening and closing a supported device */
298 static inline int gralloc_open(const struct hw_module_t* module,
299 struct alloc_device_t** device) {
300 return module->methods->open(module,
301 GRALLOC_HARDWARE_GPU0, (struct hw_device_t**)device);
304 static inline int gralloc_close(struct alloc_device_t* device) {
305 return device->common.close(&device->common);
310 #endif // ANDROID_GRALLOC_INTERFACE_H