third_party/hwcplus/include/hardware/gralloc.h

   1 /*
   2  * Copyright (C) 2008 The Android Open Source Project
   3  *
   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
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17
  18 #ifndef ANDROID_GRALLOC_INTERFACE_H
  19 #define ANDROID_GRALLOC_INTERFACE_H
  20
  21 #include <system/window.h>
  22 #include <system/graphics.h>
  23 #include <hardware/hardware.h>
  24
  25 #include <stdint.h>
  26 #include <sys/cdefs.h>
  27 #include <sys/types.h>
  28
  29 #include <cutils/native_handle.h>
  30
  31 #include <hardware/hardware.h>
  32 #include <hardware/fb.h>
  33
  34 __BEGIN_DECLS
  35
  36 /**
  37  * Module versioning information for the Gralloc hardware module, based on
  38  * gralloc_module_t.common.module_api_version.
  39  *
  40  * Version History:
  41  *
  42  * GRALLOC_MODULE_API_VERSION_0_1:
  43  * Initial Gralloc hardware module API.
  44  *
  45  * GRALLOC_MODULE_API_VERSION_0_2:
  46  * Add support for flexible YCbCr format with (*lock_ycbcr)() method.
  47  */
  48
  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)
  51
  52 #define GRALLOC_DEVICE_API_VERSION_0_1  HARDWARE_DEVICE_API_VERSION(0, 1)
  53
  54 /**
  55  * The id of this module
  56  */
  57 #define GRALLOC_HARDWARE_MODULE_ID "gralloc"
  58
  59 /**
  60  * Name of the graphics device to open
  61  */
  62
  63 #define GRALLOC_HARDWARE_GPU0 "gpu0"
  64
  65 enum {
  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,
  74
  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,
  83
  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,
 106
 107     /* buffer will be used as a RenderScript Allocation */
 108     GRALLOC_USAGE_RENDERSCRIPT          = 0x00100000,
 109
 110     /* buffer should be displayed full-screen on an external display when
 111      * possible
 112      */
 113     GRALLOC_USAGE_EXTERNAL_DISP         = 0x00002000,
 114
 115     /* Must have a hardware-protected path to external display sink for
 116      * this buffer.  If a hardware-protected path is not available, then
 117      * either don't composite only this buffer (preferred) to the
 118      * external sink, or (less desirable) do not route the entire
 119      * composition to the external sink.
 120      */
 121     GRALLOC_USAGE_PROTECTED             = 0x00004000,
 122
 123     /* implementation-specific private usage flags */
 124     GRALLOC_USAGE_PRIVATE_0             = 0x10000000,
 125     GRALLOC_USAGE_PRIVATE_1             = 0x20000000,
 126     GRALLOC_USAGE_PRIVATE_2             = 0x40000000,
 127     GRALLOC_USAGE_PRIVATE_3             = 0x80000000,
 128     GRALLOC_USAGE_PRIVATE_MASK          = 0xF0000000,
 129 };
 130
 131 /*****************************************************************************/
 132
 133 /**
 134  * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
 135  * and the fields of this data structure must begin with hw_module_t
 136  * followed by module specific information.
 137  */
 138 typedef struct gralloc_module_t {
 139     struct hw_module_t common;
 140
 141     /*
 142      * (*registerBuffer)() must be called before a buffer_handle_t that has not
 143      * been created with (*alloc_device_t::alloc)() can be used.
 144      *
 145      * This is intended to be used with buffer_handle_t's that have been
 146      * received in this process through IPC.
 147      *
 148      * This function checks that the handle is indeed a valid one and prepares
 149      * it for use with (*lock)() and (*unlock)().
 150      *
 151      * It is not necessary to call (*registerBuffer)() on a handle created
 152      * with (*alloc_device_t::alloc)().
 153      *
 154      * returns an error if this buffer_handle_t is not valid.
 155      */
 156     int (*registerBuffer)(struct gralloc_module_t const* module,
 157             buffer_handle_t handle);
 158
 159     /*
 160      * (*unregisterBuffer)() is called once this handle is no longer needed in
 161      * this process. After this call, it is an error to call (*lock)(),
 162      * (*unlock)(), or (*registerBuffer)().
 163      *
 164      * This function doesn't close or free the handle itself; this is done
 165      * by other means, usually through libcutils's native_handle_close() and
 166      * native_handle_free().
 167      *
 168      * It is an error to call (*unregisterBuffer)() on a buffer that wasn't
 169      * explicitly registered first.
 170      */
 171     int (*unregisterBuffer)(struct gralloc_module_t const* module,
 172             buffer_handle_t handle);
 173
 174     /*
 175      * The (*lock)() method is called before a buffer is accessed for the
 176      * specified usage. This call may block, for instance if the h/w needs
 177      * to finish rendering or if CPU caches need to be synchronized.
 178      *
 179      * The caller promises to modify only pixels in the area specified
 180      * by (l,t,w,h).
 181      *
 182      * The content of the buffer outside of the specified area is NOT modified
 183      * by this call.
 184      *
 185      * If usage specifies GRALLOC_USAGE_SW_*, vaddr is filled with the address
 186      * of the buffer in virtual memory.
 187      *
 188      * Note calling (*lock)() on HAL_PIXEL_FORMAT_YCbCr_*_888 buffers will fail
 189      * and return -EINVAL.  These buffers must be locked with (*lock_ycbcr)()
 190      * instead.
 191      *
 192      * THREADING CONSIDERATIONS:
 193      *
 194      * It is legal for several different threads to lock a buffer from
 195      * read access, none of the threads are blocked.
 196      *
 197      * However, locking a buffer simultaneously for write or read/write is
 198      * undefined, but:
 199      * - shall not result in termination of the process
 200      * - shall not block the caller
 201      * It is acceptable to return an error or to leave the buffer's content
 202      * into an indeterminate state.
 203      *
 204      * If the buffer was created with a usage mask incompatible with the
 205      * requested usage flags here, -EINVAL is returned.
 206      *
 207      */
 208
 209     int (*lock)(struct gralloc_module_t const* module,
 210             buffer_handle_t handle, int usage,
 211             int l, int t, int w, int h,
 212             void** vaddr);
 213
 214
 215     /*
 216      * The (*unlock)() method must be called after all changes to the buffer
 217      * are completed.
 218      */
 219
 220     int (*unlock)(struct gralloc_module_t const* module,
 221             buffer_handle_t handle);
 222
 223
 224     /* reserved for future use */
 225     int (*perform)(struct gralloc_module_t const* module,
 226             int operation, ... );
 227
 228     /*
 229      * The (*lock_ycbcr)() method is like the (*lock)() method, with the
 230      * difference that it fills a struct ycbcr with a description of the buffer
 231      * layout, and zeroes out the reserved fields.
 232      *
 233      * This will only work on buffers with HAL_PIXEL_FORMAT_YCbCr_*_888, and
 234      * will return -EINVAL on any other buffer formats.
 235      *
 236      * Added in GRALLOC_MODULE_API_VERSION_0_2.
 237      */
 238
 239     int (*lock_ycbcr)(struct gralloc_module_t const* module,
 240             buffer_handle_t handle, int usage,
 241             int l, int t, int w, int h,
 242             struct android_ycbcr *ycbcr);
 243
 244     /* reserved for future use */
 245     void* reserved_proc[6];
 246 } gralloc_module_t;
 247
 248 /*****************************************************************************/
 249
 250 /**
 251  * Every device data structure must begin with hw_device_t
 252  * followed by module specific public methods and attributes.
 253  */
 254
 255 typedef struct alloc_device_t {
 256     struct hw_device_t common;
 257
 258     /*
 259      * (*alloc)() Allocates a buffer in graphic memory with the requested
 260      * parameters and returns a buffer_handle_t and the stride in pixels to
 261      * allow the implementation to satisfy hardware constraints on the width
 262      * of a pixmap (eg: it may have to be multiple of 8 pixels).
 263      * The CALLER TAKES OWNERSHIP of the buffer_handle_t.
 264      *
 265      * If format is HAL_PIXEL_FORMAT_YCbCr_420_888, the returned stride must be
 266      * 0, since the actual strides are available from the android_ycbcr
 267      * structure.
 268      *
 269      * Returns 0 on success or -errno on error.
 270      */
 271
 272     int (*alloc)(struct alloc_device_t* dev,
 273             int w, int h, int format, int usage,
 274             buffer_handle_t* handle, int* stride);
 275
 276     /*
 277      * (*free)() Frees a previously allocated buffer.
 278      * Behavior is undefined if the buffer is still mapped in any process,
 279      * but shall not result in termination of the program or security breaches
 280      * (allowing a process to get access to another process' buffers).
 281      * THIS FUNCTION TAKES OWNERSHIP of the buffer_handle_t which becomes
 282      * invalid after the call.
 283      *
 284      * Returns 0 on success or -errno on error.
 285      */
 286     int (*free)(struct alloc_device_t* dev,
 287             buffer_handle_t handle);
 288
 289     /* This hook is OPTIONAL.
 290      *
 291      * If non NULL it will be caused by SurfaceFlinger on dumpsys
 292      */
 293     void (*dump)(struct alloc_device_t *dev, char *buff, int buff_len);
 294
 295     void* reserved_proc[7];
 296 } alloc_device_t;
 297
 298
 299 /** convenience API for opening and closing a supported device */
 300
 301 static inline int gralloc_open(const struct hw_module_t* module,
 302         struct alloc_device_t** device) {
 303     return module->methods->open(module,
 304             GRALLOC_HARDWARE_GPU0, (struct hw_device_t**)device);
 305 }
 306
 307 static inline int gralloc_close(struct alloc_device_t* device) {
 308     return device->common.close(&device->common);
 309 }
 310
 311 __END_DECLS
 312
 313 #endif  // ANDROID_GRALLOC_INTERFACE_H