graphics.h revision 5c9be402a4d934b678fe6609b6cc4d488d6ddaa4 
1/*
2 * Copyright (C) 2011 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#ifndef SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
18#define SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
19
20__BEGIN_DECLS
21
22/*
23 * If the HAL needs to create service threads to handle graphics related
24 * tasks, these threads need to run at HAL_PRIORITY_URGENT_DISPLAY priority
25 * if they can block the main rendering thread in any way.
26 *
27 * the priority of the current thread can be set with:
28 *
29 *      #include <sys/resource.h>
30 *      setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY);
31 *
32 */
33
34#define HAL_PRIORITY_URGENT_DISPLAY     (-8)
35
36/**
37 * pixel format definitions
38 */
39
40enum {
41    HAL_PIXEL_FORMAT_RGBA_8888          = 1,
42    HAL_PIXEL_FORMAT_RGBX_8888          = 2,
43    HAL_PIXEL_FORMAT_RGB_888            = 3,
44    HAL_PIXEL_FORMAT_RGB_565            = 4,
45    HAL_PIXEL_FORMAT_BGRA_8888          = 5,
46    HAL_PIXEL_FORMAT_RGBA_5551          = 6,
47    HAL_PIXEL_FORMAT_RGBA_4444          = 7,
48
49    /* 0x8 - 0xFF range unavailable */
50
51    /*
52     * 0x100 - 0x1FF
53     *
54     * This range is reserved for pixel formats that are specific to the HAL
55     * implementation.  Implementations can use any value in this range to
56     * communicate video pixel formats between their HAL modules.  These formats
57     * must not have an alpha channel.  Additionally, an EGLimage created from a
58     * gralloc buffer of one of these formats must be supported for use with the
59     * GL_OES_EGL_image_external OpenGL ES extension.
60     */
61
62    /*
63     * Android YUV format:
64     *
65     * This format is exposed outside of the HAL to software decoders and
66     * applications.  EGLImageKHR must support it in conjunction with the
67     * OES_EGL_image_external extension.
68     *
69     * YV12 is a 4:2:0 YCrCb planar format comprised of a WxH Y plane followed
70     * by (W/2) x (H/2) Cr and Cb planes.
71     *
72     * This format assumes
73     * - an even width
74     * - an even height
75     * - a horizontal stride multiple of 16 pixels
76     * - a vertical stride equal to the height
77     *
78     *   y_size = stride * height
79     *   c_size = ALIGN(stride/2, 16) * height/2
80     *   size = y_size + c_size * 2
81     *   cr_offset = y_size
82     *   cb_offset = y_size + c_size
83     *
84     */
85    HAL_PIXEL_FORMAT_YV12   = 0x32315659, // YCrCb 4:2:0 Planar
86
87
88
89    /* Legacy formats (deprecated), used by ImageFormat.java */
90    HAL_PIXEL_FORMAT_YCbCr_422_SP       = 0x10, // NV16
91    HAL_PIXEL_FORMAT_YCrCb_420_SP       = 0x11, // NV21
92    HAL_PIXEL_FORMAT_YCbCr_422_I        = 0x14, // YUY2
93};
94
95
96/**
97 * Transformation definitions
98 *
99 * IMPORTANT NOTE:
100 * HAL_TRANSFORM_ROT_90 is applied CLOCKWISE and AFTER HAL_TRANSFORM_FLIP_{H|V}.
101 *
102 */
103
104enum {
105    /* flip source image horizontally (around the vertical axis) */
106    HAL_TRANSFORM_FLIP_H    = 0x01,
107    /* flip source image vertically (around the horizontal axis)*/
108    HAL_TRANSFORM_FLIP_V    = 0x02,
109    /* rotate source image 90 degrees clockwise */
110    HAL_TRANSFORM_ROT_90    = 0x04,
111    /* rotate source image 180 degrees */
112    HAL_TRANSFORM_ROT_180   = 0x03,
113    /* rotate source image 270 degrees clockwise */
114    HAL_TRANSFORM_ROT_270   = 0x07,
115};
116
117__END_DECLS
118
119#endif /* SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H */
120