graphics.h revision 0a85154c1621b40d384b3fd7d45f3a9c0141e5a6 
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#ifdef __cplusplus
21extern "C" {
22#endif
23
24/*
25 * If the HAL needs to create service threads to handle graphics related
26 * tasks, these threads need to run at HAL_PRIORITY_URGENT_DISPLAY priority
27 * if they can block the main rendering thread in any way.
28 *
29 * the priority of the current thread can be set with:
30 *
31 *      #include <sys/resource.h>
32 *      setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY);
33 *
34 */
35
36#define HAL_PRIORITY_URGENT_DISPLAY     (-8)
37
38/**
39 * pixel format definitions
40 */
41
42enum {
43    HAL_PIXEL_FORMAT_RGBA_8888          = 1,
44    HAL_PIXEL_FORMAT_RGBX_8888          = 2,
45    HAL_PIXEL_FORMAT_RGB_888            = 3,
46    HAL_PIXEL_FORMAT_RGB_565            = 4,
47    HAL_PIXEL_FORMAT_BGRA_8888          = 5,
48    HAL_PIXEL_FORMAT_RGBA_5551          = 6,
49    HAL_PIXEL_FORMAT_RGBA_4444          = 7,
50
51    /* 0x8 - 0xFF range unavailable */
52
53    /*
54     * 0x100 - 0x1FF
55     *
56     * This range is reserved for pixel formats that are specific to the HAL
57     * implementation.  Implementations can use any value in this range to
58     * communicate video pixel formats between their HAL modules.  These formats
59     * must not have an alpha channel.  Additionally, an EGLimage created from a
60     * gralloc buffer of one of these formats must be supported for use with the
61     * GL_OES_EGL_image_external OpenGL ES extension.
62     */
63
64    /*
65     * Android YUV format:
66     *
67     * This format is exposed outside of the HAL to software decoders and
68     * applications.  EGLImageKHR must support it in conjunction with the
69     * OES_EGL_image_external extension.
70     *
71     * YV12 is a 4:2:0 YCrCb planar format comprised of a WxH Y plane followed
72     * by (W/2) x (H/2) Cr and Cb planes.
73     *
74     * This format assumes
75     * - an even width
76     * - an even height
77     * - a horizontal stride multiple of 16 pixels
78     * - a vertical stride equal to the height
79     *
80     *   y_size = stride * height
81     *   c_size = ALIGN(stride/2, 16) * height/2
82     *   size = y_size + c_size * 2
83     *   cr_offset = y_size
84     *   cb_offset = y_size + c_size
85     *
86     */
87    HAL_PIXEL_FORMAT_YV12   = 0x32315659, // YCrCb 4:2:0 Planar
88
89    /*
90     * Android RAW sensor format:
91     *
92     * This format is exposed outside of the HAL to applications.
93     *
94     * RAW_SENSOR is a single-channel 16-bit format, typically representing raw
95     * Bayer-pattern images from an image sensor, with minimal processing.
96     *
97     * The exact pixel layout of the data in the buffer is sensor-dependent, and
98     * needs to be queried from the camera device.
99     *
100     * Generally, not all 16 bits are used; more common values are 10 or 12
101     * bits. All parameters to interpret the raw data (black and white points,
102     * color space, etc) must be queried from the camera device.
103     *
104     * This format assumes
105     * - an even width
106     * - an even height
107     * - a horizontal stride multiple of 16 pixels (32 bytes).
108     */
109    HAL_PIXEL_FORMAT_RAW_SENSOR = 0x20,
110
111    /* Legacy formats (deprecated), used by ImageFormat.java */
112    HAL_PIXEL_FORMAT_YCbCr_422_SP       = 0x10, // NV16
113    HAL_PIXEL_FORMAT_YCrCb_420_SP       = 0x11, // NV21
114    HAL_PIXEL_FORMAT_YCbCr_422_I        = 0x14, // YUY2
115};
116
117
118/**
119 * Transformation definitions
120 *
121 * IMPORTANT NOTE:
122 * HAL_TRANSFORM_ROT_90 is applied CLOCKWISE and AFTER HAL_TRANSFORM_FLIP_{H|V}.
123 *
124 */
125
126enum {
127    /* flip source image horizontally (around the vertical axis) */
128    HAL_TRANSFORM_FLIP_H    = 0x01,
129    /* flip source image vertically (around the horizontal axis)*/
130    HAL_TRANSFORM_FLIP_V    = 0x02,
131    /* rotate source image 90 degrees clockwise */
132    HAL_TRANSFORM_ROT_90    = 0x04,
133    /* rotate source image 180 degrees */
134    HAL_TRANSFORM_ROT_180   = 0x03,
135    /* rotate source image 270 degrees clockwise */
136    HAL_TRANSFORM_ROT_270   = 0x07,
137};
138
139#ifdef __cplusplus
140}
141#endif
142
143#endif /* SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H */
144