native_window.h revision 09932eceb2fcec029edc6aaa0e2bca0591613281 
1/*
2 * Copyright (C) 2010 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 * @addtogroup NativeActivity Native Activity
19 * @{
20 */
21
22/**
23 * @file native_window.h
24 */
25
26#ifndef ANDROID_NATIVE_WINDOW_H
27#define ANDROID_NATIVE_WINDOW_H
28
29#include <sys/cdefs.h>
30
31#include <android/hardware_buffer.h>
32#include <android/rect.h>
33
34#ifdef __cplusplus
35extern "C" {
36#endif
37
38/**
39 * Legacy window pixel format names, kept for backwards compatibility.
40 * New code and APIs should use AHARDWAREBUFFER_FORMAT_*.
41 */
42enum {
43    // NOTE: these values must match the values from graphics/common/x.x/types.hal
44
45    /** Red: 8 bits, Green: 8 bits, Blue: 8 bits, Alpha: 8 bits. **/
46    WINDOW_FORMAT_RGBA_8888          = AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM,
47    /** Red: 8 bits, Green: 8 bits, Blue: 8 bits, Unused: 8 bits. **/
48    WINDOW_FORMAT_RGBX_8888          = AHARDWAREBUFFER_FORMAT_R8G8B8X8_UNORM,
49    /** Red: 5 bits, Green: 6 bits, Blue: 5 bits. **/
50    WINDOW_FORMAT_RGB_565            = AHARDWAREBUFFER_FORMAT_R5G6B5_UNORM,
51};
52
53/**
54 * Transforms that can be applied to buffers as they are displayed to a window.
55 *
56 * Supported transforms are any combination of horizontal mirror, vertical
57 * mirror, and clockwise 90 degree rotation, in that order. Rotations of 180
58 * and 270 degrees are made up of those basic transforms.
59 */
60enum ANativeWindowTransform {
61    ANATIVEWINDOW_TRANSFORM_IDENTITY            = 0x00,
62    ANATIVEWINDOW_TRANSFORM_MIRROR_HORIZONTAL   = 0x01,
63    ANATIVEWINDOW_TRANSFORM_MIRROR_VERTICAL     = 0x02,
64    ANATIVEWINDOW_TRANSFORM_ROTATE_90           = 0x04,
65
66    ANATIVEWINDOW_TRANSFORM_ROTATE_180          = ANATIVEWINDOW_TRANSFORM_MIRROR_HORIZONTAL |
67                                                  ANATIVEWINDOW_TRANSFORM_MIRROR_VERTICAL,
68    ANATIVEWINDOW_TRANSFORM_ROTATE_270          = ANATIVEWINDOW_TRANSFORM_ROTATE_180 |
69                                                  ANATIVEWINDOW_TRANSFORM_ROTATE_90,
70};
71
72struct ANativeWindow;
73/**
74 * {@link ANativeWindow} is opaque type that provides access to a native window.
75 *
76 * A pointer can be obtained using ANativeWindow_fromSurface().
77 */
78typedef struct ANativeWindow ANativeWindow;
79
80/**
81 * {@link ANativeWindow} is a struct that represents a windows buffer.
82 *
83 * A pointer can be obtained using ANativeWindow_lock().
84 */
85typedef struct ANativeWindow_Buffer {
86    // The number of pixels that are show horizontally.
87    int32_t width;
88
89    // The number of pixels that are shown vertically.
90    int32_t height;
91
92    // The number of *pixels* that a line in the buffer takes in
93    // memory.  This may be >= width.
94    int32_t stride;
95
96    // The format of the buffer.  One of WINDOW_FORMAT_*
97    int32_t format;
98
99    // The actual bits.
100    void* bits;
101
102    // Do not touch.
103    uint32_t reserved[6];
104} ANativeWindow_Buffer;
105
106/**
107 * Acquire a reference on the given ANativeWindow object.  This prevents the object
108 * from being deleted until the reference is removed.
109 */
110void ANativeWindow_acquire(ANativeWindow* window);
111
112/**
113 * Remove a reference that was previously acquired with ANativeWindow_acquire().
114 */
115void ANativeWindow_release(ANativeWindow* window);
116
117/**
118 * Return the current width in pixels of the window surface.  Returns a
119 * negative value on error.
120 */
121int32_t ANativeWindow_getWidth(ANativeWindow* window);
122
123/**
124 * Return the current height in pixels of the window surface.  Returns a
125 * negative value on error.
126 */
127int32_t ANativeWindow_getHeight(ANativeWindow* window);
128
129/**
130 * Return the current pixel format of the window surface.  Returns a
131 * negative value on error.
132 */
133int32_t ANativeWindow_getFormat(ANativeWindow* window);
134
135/**
136 * Change the format and size of the window buffers.
137 *
138 * The width and height control the number of pixels in the buffers, not the
139 * dimensions of the window on screen.  If these are different than the
140 * window's physical size, then it buffer will be scaled to match that size
141 * when compositing it to the screen.
142 *
143 * For all of these parameters, if 0 is supplied then the window's base
144 * value will come back in force.
145 *
146 * width and height must be either both zero or both non-zero.
147 *
148 */
149int32_t ANativeWindow_setBuffersGeometry(ANativeWindow* window,
150        int32_t width, int32_t height, int32_t format);
151
152/**
153 * Lock the window's next drawing surface for writing.
154 * inOutDirtyBounds is used as an in/out parameter, upon entering the
155 * function, it contains the dirty region, that is, the region the caller
156 * intends to redraw. When the function returns, inOutDirtyBounds is updated
157 * with the actual area the caller needs to redraw -- this region is often
158 * extended by ANativeWindow_lock.
159 */
160int32_t ANativeWindow_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
161        ARect* inOutDirtyBounds);
162
163/**
164 * Unlock the window's drawing surface after previously locking it,
165 * posting the new buffer to the display.
166 */
167int32_t ANativeWindow_unlockAndPost(ANativeWindow* window);
168
169#if __ANDROID_API__ >= __ANDROID_API_O__
170
171/**
172 * Set a transform that will be applied to future buffers posted to the window.
173 *
174 * @param transform combination of {@link ANativeWindowTransform} flags
175 * @return 0 if successful
176 * @return -EINVAL if @param transform is invalid
177 */
178int32_t ANativeWindow_setBuffersTransform(ANativeWindow* window, int32_t transform);
179
180#endif // __ANDROID_API__ >= __ANDROID_API_O__
181
182#ifdef __cplusplus
183};
184#endif
185
186#endif // ANDROID_NATIVE_WINDOW_H
187
188/** @} */
189