include/system/graphics.h

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
#define SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H

__BEGIN_DECLS

/*
 * If the HAL needs to create service threads to handle graphics related
 * tasks, these threads need to run at HAL_PRIORITY_URGENT_DISPLAY priority
 * if they can block the main rendering thread in any way.
 *
 * the priority of the current thread can be set with:
 *
 *      #include <sys/resource.h>
 *      setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY);
 *
 */

#define HAL_PRIORITY_URGENT_DISPLAY     (-8)

/**
 * pixel format definitions
 */

enum {
    HAL_PIXEL_FORMAT_RGBA_8888          = 1,
    HAL_PIXEL_FORMAT_RGBX_8888          = 2,
    HAL_PIXEL_FORMAT_RGB_888            = 3,
    HAL_PIXEL_FORMAT_RGB_565            = 4,
    HAL_PIXEL_FORMAT_BGRA_8888          = 5,
    HAL_PIXEL_FORMAT_RGBA_5551          = 6,
    HAL_PIXEL_FORMAT_RGBA_4444          = 7,

    /* 0x8 - 0xFF range unavailable */

    /*
     * 0x100 - 0x1FF
     *
     * This range is reserved for pixel formats that are specific to the HAL
     * implementation.  Implementations can use any value in this range to
     * communicate video pixel formats between their HAL modules.  These formats
     * must not have an alpha channel.  Additionally, an EGLimage created from a
     * gralloc buffer of one of these formats must be supported for use with the
     * GL_OES_EGL_image_external OpenGL ES extension.
     */

    /*
     * Android YUV format:
     *
     * This format is exposed outside of the HAL to software decoders and
     * applications.  EGLImageKHR must support it in conjunction with the
     * OES_EGL_image_external extension.
     *
     * YV12 is a 4:2:0 YCrCb planar format comprised of a WxH Y plane followed
     * by (W/2) x (H/2) Cr and Cb planes.
     *
     * This format assumes
     * - an even width
     * - an even height
     * - a horizontal stride multiple of 16 pixels
     * - a vertical stride equal to the height
     *
     *   y_size = stride * height
     *   c_size = ALIGN(stride/2, 16) * height/2
     *   size = y_size + c_size * 2
     *   cr_offset = y_size
     *   cb_offset = y_size + c_size
     *
     */
    HAL_PIXEL_FORMAT_YV12   = 0x32315659, // YCrCb 4:2:0 Planar



    /* Legacy formats (deprecated), used by ImageFormat.java */
    HAL_PIXEL_FORMAT_YCbCr_422_SP       = 0x10, // NV16
    HAL_PIXEL_FORMAT_YCrCb_420_SP       = 0x11, // NV21
    HAL_PIXEL_FORMAT_YCbCr_422_I        = 0x14, // YUY2
};


/**
 * Transformation definitions
 *
 * IMPORTANT NOTE:
 * HAL_TRANSFORM_ROT_90 is applied CLOCKWISE and AFTER HAL_TRANSFORM_FLIP_{H|V}.
 *
 */

enum {
    /* flip source image horizontally (around the vertical axis) */
    HAL_TRANSFORM_FLIP_H    = 0x01,
    /* flip source image vertically (around the horizontal axis)*/
    HAL_TRANSFORM_FLIP_V    = 0x02,
    /* rotate source image 90 degrees clockwise */
    HAL_TRANSFORM_ROT_90    = 0x04,
    /* rotate source image 180 degrees */
    HAL_TRANSFORM_ROT_180   = 0x03,
    /* rotate source image 270 degrees clockwise */
    HAL_TRANSFORM_ROT_270   = 0x07,
};

__END_DECLS

#endif /* SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H */