native_window.h revision 000879a0eb2156727a2221e42d04b6f3e150aa79
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 AHARDWAREBUFFER_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 (AHARDWAREBUFFER_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 * format: one of AHARDWAREBUFFER_FORMAT_ constants 139 * 140 * The width and height control the number of pixels in the buffers, not the 141 * dimensions of the window on screen. If these are different than the 142 * window's physical size, then it buffer will be scaled to match that size 143 * when compositing it to the screen. 144 * 145 * For all of these parameters, if 0 is supplied then the window's base 146 * value will come back in force. 147 * 148 * width and height must be either both zero or both non-zero. 149 * 150 */ 151int32_t ANativeWindow_setBuffersGeometry(ANativeWindow* window, 152 int32_t width, int32_t height, int32_t format); 153 154/** 155 * Lock the window's next drawing surface for writing. 156 * inOutDirtyBounds is used as an in/out parameter, upon entering the 157 * function, it contains the dirty region, that is, the region the caller 158 * intends to redraw. When the function returns, inOutDirtyBounds is updated 159 * with the actual area the caller needs to redraw -- this region is often 160 * extended by ANativeWindow_lock. 161 */ 162int32_t ANativeWindow_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer, 163 ARect* inOutDirtyBounds); 164 165/** 166 * Unlock the window's drawing surface after previously locking it, 167 * posting the new buffer to the display. 168 */ 169int32_t ANativeWindow_unlockAndPost(ANativeWindow* window); 170 171#if __ANDROID_API__ >= __ANDROID_API_O__ 172 173/** 174 * Set a transform that will be applied to future buffers posted to the window. 175 * 176 * @param transform combination of {@link ANativeWindowTransform} flags 177 * @return 0 if successful 178 * @return -EINVAL if @param transform is invalid 179 */ 180int32_t ANativeWindow_setBuffersTransform(ANativeWindow* window, int32_t transform); 181 182#endif // __ANDROID_API__ >= __ANDROID_API_O__ 183 184#ifdef __cplusplus 185}; 186#endif 187 188#endif // ANDROID_NATIVE_WINDOW_H 189 190/** @} */ 191