/*
 * 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

#include <stddef.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

/*
 * 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
 */

typedef enum android_pixel_format {
    /*
     * "linear" color pixel formats:
     *
     * When used with ANativeWindow, the dataSpace field describes the color
     * space of the buffer.
     *
     * The color space determines, for example, if the formats are linear or
     * gamma-corrected; or whether any special operations are performed when
     * reading or writing into a buffer in one of these formats.
     */
    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,

    /*
     * 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_stride = ALIGN(stride/2, 16)
     *   c_size = c_stride * height/2
     *   size = y_size + c_size * 2
     *   cr_offset = y_size
     *   cb_offset = y_size + c_size
     *
     * When used with ANativeWindow, the dataSpace field describes the color
     * space of the buffer.
     */
    HAL_PIXEL_FORMAT_YV12   = 0x32315659, // YCrCb 4:2:0 Planar


    /*
     * Android Y8 format:
     *
     * This format is exposed outside of the HAL to the framework.
     * The expected gralloc usage flags are SW_* and HW_CAMERA_*,
     * and no other HW_ flags will be used.
     *
     * Y8 is a YUV planar format comprised of a WxH Y plane,
     * with each pixel being represented by 8 bits.
     *
     * It is equivalent to just the Y plane from YV12.
     *
     * This format assumes
     * - an even width
     * - an even height
     * - a horizontal stride multiple of 16 pixels
     * - a vertical stride equal to the height
     *
     *   size = stride * height
     *
     * When used with ANativeWindow, the dataSpace field describes the color
     * space of the buffer.
     */
    HAL_PIXEL_FORMAT_Y8     = 0x20203859,

    /*
     * Android Y16 format:
     *
     * This format is exposed outside of the HAL to the framework.
     * The expected gralloc usage flags are SW_* and HW_CAMERA_*,
     * and no other HW_ flags will be used.
     *
     * Y16 is a YUV planar format comprised of a WxH Y plane,
     * with each pixel being represented by 16 bits.
     *
     * It is just like Y8, but has double the bits per pixel (little endian).
     *
     * This format assumes
     * - an even width
     * - an even height
     * - a horizontal stride multiple of 16 pixels
     * - a vertical stride equal to the height
     * - strides are specified in pixels, not in bytes
     *
     *   size = stride * height * 2
     *
     * When used with ANativeWindow, the dataSpace field describes the color
     * space of the buffer, except that dataSpace field
     * HAL_DATASPACE_DEPTH indicates that this buffer contains a depth
     * image where each sample is a distance value measured by a depth camera,
     * plus an associated confidence value.
     */
    HAL_PIXEL_FORMAT_Y16    = 0x20363159,

    /*
     * Android RAW sensor format:
     *
     * This format is exposed outside of the camera HAL to applications.
     *
     * RAW16 is a single-channel, 16-bit, little endian format, typically
     * representing raw Bayer-pattern images from an image sensor, with minimal
     * processing.
     *
     * The exact pixel layout of the data in the buffer is sensor-dependent, and
     * needs to be queried from the camera device.
     *
     * Generally, not all 16 bits are used; more common values are 10 or 12
     * bits. If not all bits are used, the lower-order bits are filled first.
     * All parameters to interpret the raw data (black and white points,
     * color space, etc) must be queried from the camera device.
     *
     * This format assumes
     * - an even width
     * - an even height
     * - a horizontal stride multiple of 16 pixels
     * - a vertical stride equal to the height
     * - strides are specified in pixels, not in bytes
     *
     *   size = stride * height * 2
     *
     * This format must be accepted by the gralloc module when used with the
     * following usage flags:
     *    - GRALLOC_USAGE_HW_CAMERA_*
     *    - GRALLOC_USAGE_SW_*
     *    - GRALLOC_USAGE_RENDERSCRIPT
     *
     * When used with ANativeWindow, the dataSpace should be
     * HAL_DATASPACE_ARBITRARY, as raw image sensor buffers require substantial
     * extra metadata to define.
     */
    HAL_PIXEL_FORMAT_RAW16 = 0x20,

    /*
     * Android RAW10 format:
     *
     * This format is exposed outside of the camera HAL to applications.
     *
     * RAW10 is a single-channel, 10-bit per pixel, densely packed in each row,
     * unprocessed format, usually representing raw Bayer-pattern images coming from
     * an image sensor.
     *
     * In an image buffer with this format, starting from the first pixel of each
     * row, each 4 consecutive pixels are packed into 5 bytes (40 bits). Each one
     * of the first 4 bytes contains the top 8 bits of each pixel, The fifth byte
     * contains the 2 least significant bits of the 4 pixels, the exact layout data
     * for each 4 consecutive pixels is illustrated below (Pi[j] stands for the jth
     * bit of the ith pixel):
     *
     *          bit 7                                     bit 0
     *          =====|=====|=====|=====|=====|=====|=====|=====|
     * Byte 0: |P0[9]|P0[8]|P0[7]|P0[6]|P0[5]|P0[4]|P0[3]|P0[2]|
     *         |-----|-----|-----|-----|-----|-----|-----|-----|
     * Byte 1: |P1[9]|P1[8]|P1[7]|P1[6]|P1[5]|P1[4]|P1[3]|P1[2]|
     *         |-----|-----|-----|-----|-----|-----|-----|-----|
     * Byte 2: |P2[9]|P2[8]|P2[7]|P2[6]|P2[5]|P2[4]|P2[3]|P2[2]|
     *         |-----|-----|-----|-----|-----|-----|-----|-----|
     * Byte 3: |P3[9]|P3[8]|P3[7]|P3[6]|P3[5]|P3[4]|P3[3]|P3[2]|
     *         |-----|-----|-----|-----|-----|-----|-----|-----|
     * Byte 4: |P3[1]|P3[0]|P2[1]|P2[0]|P1[1]|P1[0]|P0[1]|P0[0]|
     *          ===============================================
     *
     * This format assumes
     * - a width multiple of 4 pixels
     * - an even height
     * - a vertical stride equal to the height
     * - strides are specified in bytes, not in pixels
     *
     *   size = stride * height
     *
     * When stride is equal to width * (10 / 8), there will be no padding bytes at
     * the end of each row, the entire image data is densely packed. When stride is
     * larger than width * (10 / 8), padding bytes will be present at the end of each
     * row (including the last row).
     *
     * This format must be accepted by the gralloc module when used with the
     * following usage flags:
     *    - GRALLOC_USAGE_HW_CAMERA_*
     *    - GRALLOC_USAGE_SW_*
     *    - GRALLOC_USAGE_RENDERSCRIPT
     *
     * When used with ANativeWindow, the dataSpace field should be
     * HAL_DATASPACE_ARBITRARY, as raw image sensor buffers require substantial
     * extra metadata to define.
     */
    HAL_PIXEL_FORMAT_RAW10 = 0x25,

    /*
     * Android RAW12 format:
     *
     * This format is exposed outside of camera HAL to applications.
     *
     * RAW12 is a single-channel, 12-bit per pixel, densely packed in each row,
     * unprocessed format, usually representing raw Bayer-pattern images coming from
     * an image sensor.
     *
     * In an image buffer with this format, starting from the first pixel of each
     * row, each two consecutive pixels are packed into 3 bytes (24 bits). The first
     * and second byte contains the top 8 bits of first and second pixel. The third
     * byte contains the 4 least significant bits of the two pixels, the exact layout
     * data for each two consecutive pixels is illustrated below (Pi[j] stands for
     * the jth bit of the ith pixel):
     *
     *           bit 7                                            bit 0
     *          ======|======|======|======|======|======|======|======|
     * Byte 0: |P0[11]|P0[10]|P0[ 9]|P0[ 8]|P0[ 7]|P0[ 6]|P0[ 5]|P0[ 4]|
     *         |------|------|------|------|------|------|------|------|
     * Byte 1: |P1[11]|P1[10]|P1[ 9]|P1[ 8]|P1[ 7]|P1[ 6]|P1[ 5]|P1[ 4]|
     *         |------|------|------|------|------|------|------|------|
     * Byte 2: |P1[ 3]|P1[ 2]|P1[ 1]|P1[ 0]|P0[ 3]|P0[ 2]|P0[ 1]|P0[ 0]|
     *          =======================================================
     *
     * This format assumes:
     * - a width multiple of 4 pixels
     * - an even height
     * - a vertical stride equal to the height
     * - strides are specified in bytes, not in pixels
     *
     *   size = stride * height
     *
     * When stride is equal to width * (12 / 8), there will be no padding bytes at
     * the end of each row, the entire image data is densely packed. When stride is
     * larger than width * (12 / 8), padding bytes will be present at the end of
     * each row (including the last row).
     *
     * This format must be accepted by the gralloc module when used with the
     * following usage flags:
     *    - GRALLOC_USAGE_HW_CAMERA_*
     *    - GRALLOC_USAGE_SW_*
     *    - GRALLOC_USAGE_RENDERSCRIPT
     *
     * When used with ANativeWindow, the dataSpace field should be
     * HAL_DATASPACE_ARBITRARY, as raw image sensor buffers require substantial
     * extra metadata to define.
     */
    HAL_PIXEL_FORMAT_RAW12 = 0x26,

    /*
     * Android opaque RAW format:
     *
     * This format is exposed outside of the camera HAL to applications.
     *
     * RAW_OPAQUE is a format for unprocessed raw image buffers coming from an
     * image sensor. The actual structure of buffers of this format is
     * implementation-dependent.
     *
     * This format must be accepted by the gralloc module when used with the
     * following usage flags:
     *    - GRALLOC_USAGE_HW_CAMERA_*
     *    - GRALLOC_USAGE_SW_*
     *    - GRALLOC_USAGE_RENDERSCRIPT
     *
     * When used with ANativeWindow, the dataSpace field should be
     * HAL_DATASPACE_ARBITRARY, as raw image sensor buffers require substantial
     * extra metadata to define.
     */
    HAL_PIXEL_FORMAT_RAW_OPAQUE = 0x24,

    /*
     * Android binary blob graphics buffer format:
     *
     * This format is used to carry task-specific data which does not have a
     * standard image structure. The details of the format are left to the two
     * endpoints.
     *
     * A typical use case is for transporting JPEG-compressed images from the
     * Camera HAL to the framework or to applications.
     *
     * Buffers of this format must have a height of 1, and width equal to their
     * size in bytes.
     *
     * When used with ANativeWindow, the mapping of the dataSpace field to
     * buffer contents for BLOB is as follows:
     *
     *  dataSpace value               | Buffer contents
     * -------------------------------+-----------------------------------------
     *  HAL_DATASPACE_JFIF            | An encoded JPEG image
     *  HAL_DATASPACE_DEPTH           | An android_depth_points buffer
     *  Other                         | Unsupported
     *
     */
    HAL_PIXEL_FORMAT_BLOB = 0x21,

    /*
     * Android format indicating that the choice of format is entirely up to the
     * device-specific Gralloc implementation.
     *
     * The Gralloc implementation should examine the usage bits passed in when
     * allocating a buffer with this format, and it should derive the pixel
     * format from those usage flags.  This format will never be used with any
     * of the GRALLOC_USAGE_SW_* usage flags.
     *
     * If a buffer of this format is to be used as an OpenGL ES texture, the
     * framework will assume that sampling the texture will always return an
     * alpha value of 1.0 (i.e. the buffer contains only opaque pixel values).
     *
     * When used with ANativeWindow, the dataSpace field describes the color
     * space of the buffer.
     */
    HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED = 0x22,

    /*
     * Android flexible YCbCr 4:2:0 formats
     *
     * This format allows platforms to use an efficient YCbCr/YCrCb 4:2:0
     * buffer layout, while still describing the general format in a
     * layout-independent manner.  While called YCbCr, it can be
     * used to describe formats with either chromatic ordering, as well as
     * whole planar or semiplanar layouts.
     *
     * struct android_ycbcr (below) is the the struct used to describe it.
     *
     * This format must be accepted by the gralloc module when
     * USAGE_SW_WRITE_* or USAGE_SW_READ_* are set.
     *
     * This format is locked for use by gralloc's (*lock_ycbcr) method, and
     * locking with the (*lock) method will return an error.
     *
     * When used with ANativeWindow, the dataSpace field describes the color
     * space of the buffer.
     */
    HAL_PIXEL_FORMAT_YCbCr_420_888 = 0x23,

    /*
     * Android flexible YCbCr 4:2:2 formats
     *
     * This format allows platforms to use an efficient YCbCr/YCrCb 4:2:2
     * buffer layout, while still describing the general format in a
     * layout-independent manner.  While called YCbCr, it can be
     * used to describe formats with either chromatic ordering, as well as
     * whole planar or semiplanar layouts.
     *
     * This format is currently only used by SW readable buffers
     * produced by MediaCodecs, so the gralloc module can ignore this format.
     */
    HAL_PIXEL_FORMAT_YCbCr_422_888 = 0x27,

    /*
     * Android flexible YCbCr 4:4:4 formats
     *
     * This format allows platforms to use an efficient YCbCr/YCrCb 4:4:4
     * buffer layout, while still describing the general format in a
     * layout-independent manner.  While called YCbCr, it can be
     * used to describe formats with either chromatic ordering, as well as
     * whole planar or semiplanar layouts.
     *
     * This format is currently only used by SW readable buffers
     * produced by MediaCodecs, so the gralloc module can ignore this format.
     */
    HAL_PIXEL_FORMAT_YCbCr_444_888 = 0x28,

    /*
     * Android flexible RGB 888 formats
     *
     * This format allows platforms to use an efficient RGB/BGR/RGBX/BGRX
     * buffer layout, while still describing the general format in a
     * layout-independent manner.  While called RGB, it can be
     * used to describe formats with either color ordering and optional
     * padding, as well as whole planar layout.
     *
     * This format is currently only used by SW readable buffers
     * produced by MediaCodecs, so the gralloc module can ignore this format.
     */
    HAL_PIXEL_FORMAT_FLEX_RGB_888 = 0x29,

    /*
     * Android flexible RGBA 8888 formats
     *
     * This format allows platforms to use an efficient RGBA/BGRA/ARGB/ABGR
     * buffer layout, while still describing the general format in a
     * layout-independent manner.  While called RGBA, it can be
     * used to describe formats with any of the component orderings, as
     * well as whole planar layout.
     *
     * This format is currently only used by SW readable buffers
     * produced by MediaCodecs, so the gralloc module can ignore this format.
     */
    HAL_PIXEL_FORMAT_FLEX_RGBA_8888 = 0x2A,

    /* 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
} android_pixel_format_t;

/*
 * Structure for describing YCbCr formats for consumption by applications.
 * This is used with HAL_PIXEL_FORMAT_YCbCr_*_888.
 *
 * Buffer chroma subsampling is defined in the format.
 * e.g. HAL_PIXEL_FORMAT_YCbCr_420_888 has subsampling 4:2:0.
 *
 * Buffers must have a 8 bit depth.
 *
 * @y, @cb, and @cr point to the first byte of their respective planes.
 *
 * Stride describes the distance in bytes from the first value of one row of
 * the image to the first value of the next row.  It includes the width of the
 * image plus padding.
 * @ystride is the stride of the luma plane.
 * @cstride is the stride of the chroma planes.
 *
 * @chroma_step is the distance in bytes from one chroma pixel value to the
 * next.  This is 2 bytes for semiplanar (because chroma values are interleaved
 * and each chroma value is one byte) and 1 for planar.
 */

struct android_ycbcr {
    void *y;
    void *cb;
    void *cr;
    size_t ystride;
    size_t cstride;
    size_t chroma_step;

    /** reserved for future use, set to 0 by gralloc's (*lock_ycbcr)() */
    uint32_t reserved[8];
};

/*
 * Structures for describing flexible YUVA/RGBA formats for consumption by
 * applications. Such flexible formats contain a plane for each component (e.g.
 * red, green, blue), where each plane is laid out in a grid-like pattern
 * occupying unique byte addresses and with consistent byte offsets between
 * neighboring pixels.
 *
 * The android_flex_layout structure is used with any pixel format that can be
 * represented by it, such as:
 *  - HAL_PIXEL_FORMAT_YCbCr_*_888
 *  - HAL_PIXEL_FORMAT_FLEX_RGB*_888
 *  - HAL_PIXEL_FORMAT_RGB[AX]_888[8],BGRA_8888,RGB_888
 *  - HAL_PIXEL_FORMAT_YV12,Y8,Y16,YCbCr_422_SP/I,YCrCb_420_SP
 *  - even implementation defined formats that can be represented by
 *    the structures
 *
 * Vertical increment (aka. row increment or stride) describes the distance in
 * bytes from the first pixel of one row to the first pixel of the next row
 * (below) for the component plane. This can be negative.
 *
 * Horizontal increment (aka. column or pixel increment) describes the distance
 * in bytes from one pixel to the next pixel (to the right) on the same row for
 * the component plane. This can be negative.
 *
 * Each plane can be subsampled either vertically or horizontally by
 * a power-of-two factor.
 *
 * The bit-depth of each component can be arbitrary, as long as the pixels are
 * laid out on whole bytes, in native byte-order, using the most significant
 * bits of each unit.
 */

typedef enum android_flex_component {
    /* luma */
    FLEX_COMPONENT_Y = 1 << 0,
    /* chroma blue */
    FLEX_COMPONENT_Cb = 1 << 1,
    /* chroma red */
    FLEX_COMPONENT_Cr = 1 << 2,

    /* red */
    FLEX_COMPONENT_R = 1 << 10,
    /* green */
    FLEX_COMPONENT_G = 1 << 11,
    /* blue */
    FLEX_COMPONENT_B = 1 << 12,

    /* alpha */
    FLEX_COMPONENT_A = 1 << 30,
} android_flex_component_t;

typedef struct android_flex_plane {
    /* pointer to the first byte of the top-left pixel of the plane. */
    uint8_t *top_left;

    android_flex_component_t component;

    /* bits allocated for the component in each pixel. Must be a positive
       multiple of 8. */
    int32_t bits_per_component;
    /* number of the most significant bits used in the format for this
       component. Must be between 1 and bits_per_component, inclusive. */
    int32_t bits_used;

    /* horizontal increment */
    int32_t h_increment;
    /* vertical increment */
    int32_t v_increment;
    /* horizontal subsampling. Must be a positive power of 2. */
    int32_t h_subsampling;
    /* vertical subsampling. Must be a positive power of 2. */
    int32_t v_subsampling;
} android_flex_plane_t;

typedef enum android_flex_format {
    /* not a flexible format */
    FLEX_FORMAT_INVALID = 0x0,
    FLEX_FORMAT_Y = FLEX_COMPONENT_Y,
    FLEX_FORMAT_YCbCr = FLEX_COMPONENT_Y | FLEX_COMPONENT_Cb | FLEX_COMPONENT_Cr,
    FLEX_FORMAT_YCbCrA = FLEX_FORMAT_YCbCr | FLEX_COMPONENT_A,
    FLEX_FORMAT_RGB = FLEX_COMPONENT_R | FLEX_COMPONENT_G | FLEX_COMPONENT_B,
    FLEX_FORMAT_RGBA = FLEX_FORMAT_RGB | FLEX_COMPONENT_A,
} android_flex_format_t;

typedef struct android_flex_layout {
    /* the kind of flexible format */
    android_flex_format_t format;

    /* number of planes; 0 for FLEX_FORMAT_INVALID */
    uint32_t num_planes;
    /* a plane for each component; ordered in increasing component value order.
       E.g. FLEX_FORMAT_RGBA maps 0 -> R, 1 -> G, etc.
       Can be NULL for FLEX_FORMAT_INVALID */
    android_flex_plane_t *planes;
} android_flex_layout_t;

/**
 * Structure used to define depth point clouds for format HAL_PIXEL_FORMAT_BLOB
 * with dataSpace value of HAL_DATASPACE_DEPTH.
 * When locking a native buffer of the above format and dataSpace value,
 * the vaddr pointer can be cast to this structure.
 *
 * A variable-length list of (x,y,z, confidence) 3D points, as floats.  (x, y,
 * z) represents a measured point's position, with the coordinate system defined
 * by the data source.  Confidence represents the estimated likelihood that this
 * measurement is correct. It is between 0.f and 1.f, inclusive, with 1.f ==
 * 100% confidence.
 *
 * @num_points is the number of points in the list
 *
 * @xyz_points is the flexible array of floating-point values.
 *   It contains (num_points) * 4 floats.
 *
 *   For example:
 *     android_depth_points d = get_depth_buffer();
 *     struct {
 *       float x; float y; float z; float confidence;
 *     } firstPoint, lastPoint;
 *
 *     firstPoint.x = d.xyzc_points[0];
 *     firstPoint.y = d.xyzc_points[1];
 *     firstPoint.z = d.xyzc_points[2];
 *     firstPoint.confidence = d.xyzc_points[3];
 *     lastPoint.x = d.xyzc_points[(d.num_points - 1) * 4 + 0];
 *     lastPoint.y = d.xyzc_points[(d.num_points - 1) * 4 + 1];
 *     lastPoint.z = d.xyzc_points[(d.num_points - 1) * 4 + 2];
 *     lastPoint.confidence = d.xyzc_points[(d.num_points - 1) * 4 + 3];
 */

struct android_depth_points {
    uint32_t num_points;

    /** reserved for future use, set to 0 by gralloc's (*lock)() */
    uint32_t reserved[8];

    float xyzc_points[];
};

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

typedef enum android_transform {
    /* 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,
    /* don't use. see system/window.h */
    HAL_TRANSFORM_RESERVED  = 0x08,
} android_transform_t;

/**
 * Dataspace Definitions
 * ======================
 *
 * Dataspace is the definition of how pixel values should be interpreted.
 *
 * For many formats, this is the colorspace of the image data, which includes
 * primaries (including white point) and the transfer characteristic function,
 * which describes both gamma curve and numeric range (within the bit depth).
 *
 * Other dataspaces include depth measurement data from a depth camera.
 *
 * A dataspace is comprised of a number of fields.
 *
 * Version
 * --------
 * The top 2 bits represent the revision of the field specification. This is
 * currently always 0.
 *
 *
 * bits    31-30 29                      -                          0
 *        +-----+----------------------------------------------------+
 * fields | Rev |            Revision specific fields                |
 *        +-----+----------------------------------------------------+
 *
 * Field layout for version = 0:
 * ----------------------------
 *
 * A dataspace is comprised of the following fields:
 *      Standard
 *      Transfer function
 *      Range
 *
 * bits    31-30 29-27 26 -  22 21 -  16 15             -           0
 *        +-----+-----+--------+--------+----------------------------+
 * fields |  0  |Range|Transfer|Standard|    Legacy and custom       |
 *        +-----+-----+--------+--------+----------------------------+
 *          VV    RRR   TTTTT    SSSSSS    LLLLLLLL       LLLLLLLL
 *
 * If range, transfer and standard fields are all 0 (e.g. top 16 bits are
 * all zeroes), the bottom 16 bits contain either a legacy dataspace value,
 * or a custom value.
 */

typedef enum android_dataspace {
    /*
     * Default-assumption data space, when not explicitly specified.
     *
     * It is safest to assume the buffer is an image with sRGB primaries and
     * encoding ranges, but the consumer and/or the producer of the data may
     * simply be using defaults. No automatic gamma transform should be
     * expected, except for a possible display gamma transform when drawn to a
     * screen.
     */
    HAL_DATASPACE_UNKNOWN = 0x0,

    /*
     * Arbitrary dataspace with manually defined characteristics.  Definition
     * for colorspaces or other meaning must be communicated separately.
     *
     * This is used when specifying primaries, transfer characteristics,
     * etc. separately.
     *
     * A typical use case is in video encoding parameters (e.g. for H.264),
     * where a colorspace can have separately defined primaries, transfer
     * characteristics, etc.
     */
    HAL_DATASPACE_ARBITRARY = 0x1,

    /*
     * Color-description aspects
     *
     * The following aspects define various characteristics of the color
     * specification. These represent bitfields, so that a data space value
     * can specify each of them independently.
     */

    HAL_DATASPACE_STANDARD_SHIFT = 16,

    /*
     * Standard aspect
     *
     * Defines the chromaticity coordinates of the source primaries in terms of
     * the CIE 1931 definition of x and y specified in ISO 11664-1.
     */
    HAL_DATASPACE_STANDARD_MASK = 63 << HAL_DATASPACE_STANDARD_SHIFT,  // 0x3F

    /*
     * Chromacity coordinates are unknown or are determined by the application.
     * Implementations shall use the following suggested standards:
     *
     * All YCbCr formats: BT709 if size is 720p or larger (since most video
     *                    content is letterboxed this corresponds to width is
     *                    1280 or greater, or height is 720 or greater).
     *                    BT601_625 if size is smaller than 720p or is JPEG.
     * All RGB formats:   BT709.
     *
     * For all other formats standard is undefined, and implementations should use
     * an appropriate standard for the data represented.
     */
    HAL_DATASPACE_STANDARD_UNSPECIFIED = 0 << HAL_DATASPACE_STANDARD_SHIFT,

    /*
     * Primaries:       x       y
     *  green           0.300   0.600
     *  blue            0.150   0.060
     *  red             0.640   0.330
     *  white (D65)     0.3127  0.3290
     *
     * Use the unadjusted KR = 0.2126, KB = 0.0722 luminance interpretation
     * for RGB conversion.
     */
    HAL_DATASPACE_STANDARD_BT709 = 1 << HAL_DATASPACE_STANDARD_SHIFT,

    /*
     * Primaries:       x       y
     *  green           0.290   0.600
     *  blue            0.150   0.060
     *  red             0.640   0.330
     *  white (D65)     0.3127  0.3290
     *
     *  KR = 0.299, KB = 0.114. This adjusts the luminance interpretation
     *  for RGB conversion from the one purely determined by the primaries
     *  to minimize the color shift into RGB space that uses BT.709
     *  primaries.
     */
    HAL_DATASPACE_STANDARD_BT601_625 = 2 << HAL_DATASPACE_STANDARD_SHIFT,

    /*
     * Primaries:       x       y
     *  green           0.290   0.600
     *  blue            0.150   0.060
     *  red             0.640   0.330
     *  white (D65)     0.3127  0.3290
     *
     * Use the unadjusted KR = 0.222, KB = 0.071 luminance interpretation
     * for RGB conversion.
     */
    HAL_DATASPACE_STANDARD_BT601_625_UNADJUSTED = 3 << HAL_DATASPACE_STANDARD_SHIFT,

    /*
     * Primaries:       x       y
     *  green           0.310   0.595
     *  blue            0.155   0.070
     *  red             0.630   0.340
     *  white (D65)     0.3127  0.3290
     *
     *  KR = 0.299, KB = 0.114. This adjusts the luminance interpretation
     *  for RGB conversion from the one purely determined by the primaries
     *  to minimize the color shift into RGB space that uses BT.709
     *  primaries.
     */
    HAL_DATASPACE_STANDARD_BT601_525 = 4 << HAL_DATASPACE_STANDARD_SHIFT,

    /*
     * Primaries:       x       y
     *  green           0.310   0.595
     *  blue            0.155   0.070
     *  red             0.630   0.340
     *  white (D65)     0.3127  0.3290
     *
     * Use the unadjusted KR = 0.212, KB = 0.087 luminance interpretation
     * for RGB conversion (as in SMPTE 240M).
     */
    HAL_DATASPACE_STANDARD_BT601_525_UNADJUSTED = 5 << HAL_DATASPACE_STANDARD_SHIFT,

    /*
     * Primaries:       x       y
     *  green           0.170   0.797
     *  blue            0.131   0.046
     *  red             0.708   0.292
     *  white (D65)     0.3127  0.3290
     *
     * Use the unadjusted KR = 0.2627, KB = 0.0593 luminance interpretation
     * for RGB conversion.
     */
    HAL_DATASPACE_STANDARD_BT2020 = 6 << HAL_DATASPACE_STANDARD_SHIFT,

    /*
     * Primaries:       x       y
     *  green           0.170   0.797
     *  blue            0.131   0.046
     *  red             0.708   0.292
     *  white (D65)     0.3127  0.3290
     *
     * Use the unadjusted KR = 0.2627, KB = 0.0593 luminance interpretation
     * for RGB conversion using the linear domain.
     */
    HAL_DATASPACE_STANDARD_BT2020_CONSTANT_LUMINANCE = 7 << HAL_DATASPACE_STANDARD_SHIFT,

    /*
     * Primaries:       x      y
     *  green           0.21   0.71
     *  blue            0.14   0.08
     *  red             0.67   0.33
     *  white (C)       0.310  0.316
     *
     * Use the unadjusted KR = 0.30, KB = 0.11 luminance interpretation
     * for RGB conversion.
     */
    HAL_DATASPACE_STANDARD_BT470M = 8 << HAL_DATASPACE_STANDARD_SHIFT,

    /*
     * Primaries:       x       y
     *  green           0.243   0.692
     *  blue            0.145   0.049
     *  red             0.681   0.319
     *  white (C)       0.310   0.316
     *
     * Use the unadjusted KR = 0.254, KB = 0.068 luminance interpretation
     * for RGB conversion.
     */
    HAL_DATASPACE_STANDARD_FILM = 9 << HAL_DATASPACE_STANDARD_SHIFT,

    HAL_DATASPACE_TRANSFER_SHIFT = 22,

    /*
     * Transfer aspect
     *
     * Transfer characteristics are the opto-electronic transfer characteristic
     * at the source as a function of linear optical intensity (luminance).
     *
     * For digital signals, E corresponds to the recorded value. Normally, the
     * transfer function is applied in RGB space to each of the R, G and B
     * components independently. This may result in color shift that can be
     * minized by applying the transfer function in Lab space only for the L
     * component. Implementation may apply the transfer function in RGB space
     * for all pixel formats if desired.
     */

    HAL_DATASPACE_TRANSFER_MASK = 31 << HAL_DATASPACE_TRANSFER_SHIFT,  // 0x1F

    /*
     * Transfer characteristics are unknown or are determined by the
     * application.
     *
     * Implementations should use the following transfer functions:
     *
     * For YCbCr formats: use HAL_DATASPACE_TRANSFER_SMPTE_170M
     * For RGB formats: use HAL_DATASPACE_TRANSFER_SRGB
     *
     * For all other formats transfer function is undefined, and implementations
     * should use an appropriate standard for the data represented.
     */
    HAL_DATASPACE_TRANSFER_UNSPECIFIED = 0 << HAL_DATASPACE_TRANSFER_SHIFT,

    /*
     * Transfer characteristic curve:
     *  E = L
     *      L - luminance of image 0 <= L <= 1 for conventional colorimetry
     *      E - corresponding electrical signal
     */
    HAL_DATASPACE_TRANSFER_LINEAR = 1 << HAL_DATASPACE_TRANSFER_SHIFT,

    /*
     * Transfer characteristic curve:
     *
     * E = 1.055 * L^(1/2.4) - 0.055  for 0.0031308 <= L <= 1
     *   = 12.92 * L                  for 0 <= L < 0.0031308
     *     L - luminance of image 0 <= L <= 1 for conventional colorimetry
     *     E - corresponding electrical signal
     */
    HAL_DATASPACE_TRANSFER_SRGB = 2 << HAL_DATASPACE_TRANSFER_SHIFT,

    /*
     * BT.601 525, BT.601 625, BT.709, BT.2020
     *
     * Transfer characteristic curve:
     *  E = 1.099 * L ^ 0.45 - 0.099  for 0.018 <= L <= 1
     *    = 4.500 * L                 for 0 <= L < 0.018
     *      L - luminance of image 0 <= L <= 1 for conventional colorimetry
     *      E - corresponding electrical signal
     */
    HAL_DATASPACE_TRANSFER_SMPTE_170M = 3 << HAL_DATASPACE_TRANSFER_SHIFT,

    /*
     * Assumed display gamma 2.2.
     *
     * Transfer characteristic curve:
     *  E = L ^ (1/2.2)
     *      L - luminance of image 0 <= L <= 1 for conventional colorimetry
     *      E - corresponding electrical signal
     */
    HAL_DATASPACE_TRANSFER_GAMMA2_2 = 4 << HAL_DATASPACE_TRANSFER_SHIFT,

    /*
     *  display gamma 2.8.
     *
     * Transfer characteristic curve:
     *  E = L ^ (1/2.8)
     *      L - luminance of image 0 <= L <= 1 for conventional colorimetry
     *      E - corresponding electrical signal
     */
    HAL_DATASPACE_TRANSFER_GAMMA2_8 = 5 << HAL_DATASPACE_TRANSFER_SHIFT,

    /*
     * SMPTE ST 2084
     *
     * Transfer characteristic curve:
     *  E = ((c1 + c2 * L^n) / (1 + c3 * L^n)) ^ m
     *  c1 = c3 - c2 + 1 = 3424 / 4096 = 0.8359375
     *  c2 = 32 * 2413 / 4096 = 18.8515625
     *  c3 = 32 * 2392 / 4096 = 18.6875
     *  m = 128 * 2523 / 4096 = 78.84375
     *  n = 0.25 * 2610 / 4096 = 0.1593017578125
     *      L - luminance of image 0 <= L <= 1 for HDR colorimetry.
     *          L = 1 corresponds to 10000 cd/m2
     *      E - corresponding electrical signal
     */
    HAL_DATASPACE_TRANSFER_ST2084 = 6 << HAL_DATASPACE_TRANSFER_SHIFT,

    /*
     * ARIB STD-B67 Hybrid Log Gamma
     *
     * Transfer characteristic curve:
     *  E = r * L^0.5                 for 0 <= L <= 1
     *    = a * ln(L - b) + c         for 1 < L
     *  a = 0.17883277
     *  b = 0.28466892
     *  c = 0.55991073
     *  r = 0.5
     *      L - luminance of image 0 <= L for HDR colorimetry. L = 1 corresponds
     *          to reference white level of 100 cd/m2
     *      E - corresponding electrical signal
     */
    HAL_DATASPACE_TRANSFER_HLG = 7 << HAL_DATASPACE_TRANSFER_SHIFT,

    HAL_DATASPACE_RANGE_SHIFT = 27,

    /*
     * Range aspect
     *
     * Defines the range of values corresponding to the unit range of 0-1.
     * This is defined for YCbCr only, but can be expanded to RGB space.
     */
    HAL_DATASPACE_RANGE_MASK = 7 << HAL_DATASPACE_RANGE_SHIFT,  // 0x7

    /*
     * Range is unknown or are determined by the application.  Implementations
     * shall use the following suggested ranges:
     *
     * All YCbCr formats: limited range.
     * All RGB or RGBA formats (including RAW and Bayer): full range.
     * All Y formats: full range
     *
     * For all other formats range is undefined, and implementations should use
     * an appropriate range for the data represented.
     */
    HAL_DATASPACE_RANGE_UNSPECIFIED = 0 << HAL_DATASPACE_RANGE_SHIFT,

    /*
     * Full range uses all values for Y, Cb and Cr from
     * 0 to 2^b-1, where b is the bit depth of the color format.
     */
    HAL_DATASPACE_RANGE_FULL = 1 << HAL_DATASPACE_RANGE_SHIFT,

    /*
     * Limited range uses values 16/256*2^b to 235/256*2^b for Y, and
     * 1/16*2^b to 15/16*2^b for Cb, Cr, R, G and B, where b is the bit depth of
     * the color format.
     *
     * E.g. For 8-bit-depth formats:
     * Luma (Y) samples should range from 16 to 235, inclusive
     * Chroma (Cb, Cr) samples should range from 16 to 240, inclusive
     *
     * For 10-bit-depth formats:
     * Luma (Y) samples should range from 64 to 940, inclusive
     * Chroma (Cb, Cr) samples should range from 64 to 960, inclusive
     */
    HAL_DATASPACE_RANGE_LIMITED = 2 << HAL_DATASPACE_RANGE_SHIFT,

    /*
     * Legacy dataspaces
     */

    /*
     * sRGB linear encoding:
     *
     * The red, green, and blue components are stored in sRGB space, but
     * are linear, not gamma-encoded.
     * The RGB primaries and the white point are the same as BT.709.
     *
     * The values are encoded using the full range ([0,255] for 8-bit) for all
     * components.
     */
    HAL_DATASPACE_SRGB_LINEAR = 0x200, // deprecated, use HAL_DATASPACE_V0_SRGB_LINEAR

    HAL_DATASPACE_V0_SRGB_LINEAR = HAL_DATASPACE_STANDARD_BT709 |
            HAL_DATASPACE_TRANSFER_LINEAR | HAL_DATASPACE_RANGE_FULL,


    /*
     * sRGB gamma encoding:
     *
     * The red, green and blue components are stored in sRGB space, and
     * converted to linear space when read, using the SRGB transfer function
     * for each of the R, G and B components. When written, the inverse
     * transformation is performed.
     *
     * The alpha component, if present, is always stored in linear space and
     * is left unmodified when read or written.
     *
     * Use full range and BT.709 standard.
     */
    HAL_DATASPACE_SRGB = 0x201, // deprecated, use HAL_DATASPACE_V0_SRGB

    HAL_DATASPACE_V0_SRGB = HAL_DATASPACE_STANDARD_BT709 |
            HAL_DATASPACE_TRANSFER_SRGB | HAL_DATASPACE_RANGE_FULL,


    /*
     * YCbCr Colorspaces
     * -----------------
     *
     * Primaries are given using (x,y) coordinates in the CIE 1931 definition
     * of x and y specified by ISO 11664-1.
     *
     * Transfer characteristics are the opto-electronic transfer characteristic
     * at the source as a function of linear optical intensity (luminance).
     */

    /*
     * JPEG File Interchange Format (JFIF)
     *
     * Same model as BT.601-625, but all values (Y, Cb, Cr) range from 0 to 255
     *
     * Use full range, BT.601 transfer and BT.601_625 standard.
     */
    HAL_DATASPACE_JFIF = 0x101, // deprecated, use HAL_DATASPACE_V0_JFIF

    HAL_DATASPACE_V0_JFIF = HAL_DATASPACE_STANDARD_BT601_625 |
            HAL_DATASPACE_TRANSFER_SMPTE_170M | HAL_DATASPACE_RANGE_FULL,

    /*
     * ITU-R Recommendation 601 (BT.601) - 625-line
     *
     * Standard-definition television, 625 Lines (PAL)
     *
     * Use limited range, BT.601 transfer and BT.601_625 standard.
     */
    HAL_DATASPACE_BT601_625 = 0x102, // deprecated, use HAL_DATASPACE_V0_BT601_625

    HAL_DATASPACE_V0_BT601_625 = HAL_DATASPACE_STANDARD_BT601_625 |
            HAL_DATASPACE_TRANSFER_SMPTE_170M | HAL_DATASPACE_RANGE_LIMITED,


    /*
     * ITU-R Recommendation 601 (BT.601) - 525-line
     *
     * Standard-definition television, 525 Lines (NTSC)
     *
     * Use limited range, BT.601 transfer and BT.601_525 standard.
     */
    HAL_DATASPACE_BT601_525 = 0x103, // deprecated, use HAL_DATASPACE_V0_BT601_525

    HAL_DATASPACE_V0_BT601_525 = HAL_DATASPACE_STANDARD_BT601_525 |
            HAL_DATASPACE_TRANSFER_SMPTE_170M | HAL_DATASPACE_RANGE_LIMITED,

    /*
     * ITU-R Recommendation 709 (BT.709)
     *
     * High-definition television
     *
     * Use limited range, BT.709 transfer and BT.709 standard.
     */
    HAL_DATASPACE_BT709 = 0x104, // deprecated, use HAL_DATASPACE_V0_BT709

    HAL_DATASPACE_V0_BT709 = HAL_DATASPACE_STANDARD_BT709 |
            HAL_DATASPACE_TRANSFER_SMPTE_170M | HAL_DATASPACE_RANGE_LIMITED,

    /*
     * Data spaces for non-color formats
     */

    /*
     * The buffer contains depth ranging measurements from a depth camera.
     * This value is valid with formats:
     *    HAL_PIXEL_FORMAT_Y16: 16-bit samples, consisting of a depth measurement
     *       and an associated confidence value. The 3 MSBs of the sample make
     *       up the confidence value, and the low 13 LSBs of the sample make up
     *       the depth measurement.
     *       For the confidence section, 0 means 100% confidence, 1 means 0%
     *       confidence. The mapping to a linear float confidence value between
     *       0.f and 1.f can be obtained with
     *         float confidence = (((depthSample >> 13) - 1) & 0x7) / 7.0f;
     *       The depth measurement can be extracted simply with
     *         uint16_t range = (depthSample & 0x1FFF);
     *    HAL_PIXEL_FORMAT_BLOB: A depth point cloud, as
     *       a variable-length float (x,y,z, confidence) coordinate point list.
     *       The point cloud will be represented with the android_depth_points
     *       structure.
     */
    HAL_DATASPACE_DEPTH = 0x1000

} android_dataspace_t;

/*
 * Color modes that may be supported by a display.
 *
 * Definitions:
 * Rendering intent generally defines the goal in mapping a source (input)
 * color to a destination device color for a given color mode.
 *
 *  It is important to keep in mind three cases where mapping may be applied:
 *  1. The source gamut is much smaller than the destination (display) gamut
 *  2. The source gamut is much larger than the destination gamut (this will
 *  ordinarily be handled using colorimetric rendering, below)
 *  3. The source and destination gamuts are roughly equal, although not
 *  completely overlapping
 *  Also, a common requirement for mappings is that skin tones should be
 *  preserved, or at least remain natural in appearance.
 *
 *  Colorimetric Rendering Intent (All cases):
 *  Colorimetric indicates that colors should be preserved. In the case
 *  that the source gamut lies wholly within the destination gamut or is
 *  about the same (#1, #3), this will simply mean that no manipulations
 *  (no saturation boost, for example) are applied. In the case where some
 *  source colors lie outside the destination gamut (#2, #3), those will
 *  need to be mapped to colors that are within the destination gamut,
 *  while the already in-gamut colors remain unchanged.
 *
 *  Non-colorimetric transforms can take many forms. There are no hard
 *  rules and it's left to the implementation to define.
 *  Two common intents are described below.
 *
 *  Stretched-Gamut Enhancement Intent (Source < Destination):
 *  When the destination gamut is much larger than the source gamut (#1), the
 *  source primaries may be redefined to reflect the full extent of the
 *  destination space, or to reflect an intermediate gamut.
 *  Skin-tone preservation would likely be applied. An example might be sRGB
 *  input displayed on a DCI-P3 capable device, with skin-tone preservation.
 *
 *  Within-Gamut Enhancement Intent (Source >= Destination):
 *  When the device (destination) gamut is not larger than the source gamut
 *  (#2 or #3), but the appearance of a larger gamut is desired, techniques
 *  such as saturation boost may be applied to the source colors. Skin-tone
 *  preservation may be applied. There is no unique method for within-gamut
 *  enhancement; it would be defined within a flexible color mode.
 *
 */
typedef enum android_color_mode {

  /*
   * HAL_COLOR_MODE_DEFAULT is the "native" gamut of the display.
   * White Point: Vendor/OEM defined
   * Panel Gamma: Vendor/OEM defined (typically 2.2)
   * Rendering Intent: Vendor/OEM defined (typically 'enhanced')
   */
  HAL_COLOR_MODE_NATIVE = 0,

  /*
   * HAL_COLOR_MODE_STANDARD_BT601_625 corresponds with display
   * settings that implement the ITU-R Recommendation BT.601
   * or Rec 601. Using 625 line version
   * Rendering Intent: Colorimetric
   * Primaries:
   *                  x       y
   *  green           0.290   0.600
   *  blue            0.150   0.060
   *  red             0.640   0.330
   *  white (D65)     0.3127  0.3290
   *
   *  KR = 0.299, KB = 0.114. This adjusts the luminance interpretation
   *  for RGB conversion from the one purely determined by the primaries
   *  to minimize the color shift into RGB space that uses BT.709
   *  primaries.
   *
   * Gamma Correction (GC):
   *
   *  if Vlinear < 0.018
   *    Vnonlinear = 4.500 * Vlinear
   *  else
   *    Vnonlinear = 1.099 * (Vlinear)^(0.45) – 0.099
   */
  HAL_COLOR_MODE_STANDARD_BT601_625 = 1,

  /*
   * Primaries:
   *                  x       y
   *  green           0.290   0.600
   *  blue            0.150   0.060
   *  red             0.640   0.330
   *  white (D65)     0.3127  0.3290
   *
   *  Use the unadjusted KR = 0.222, KB = 0.071 luminance interpretation
   *  for RGB conversion.
   *
   * Gamma Correction (GC):
   *
   *  if Vlinear < 0.018
   *    Vnonlinear = 4.500 * Vlinear
   *  else
   *    Vnonlinear = 1.099 * (Vlinear)^(0.45) – 0.099
   */
  HAL_COLOR_MODE_STANDARD_BT601_625_UNADJUSTED = 2,

  /*
   * Primaries:
   *                  x       y
   *  green           0.310   0.595
   *  blue            0.155   0.070
   *  red             0.630   0.340
   *  white (D65)     0.3127  0.3290
   *
   *  KR = 0.299, KB = 0.114. This adjusts the luminance interpretation
   *  for RGB conversion from the one purely determined by the primaries
   *  to minimize the color shift into RGB space that uses BT.709
   *  primaries.
   *
   * Gamma Correction (GC):
   *
   *  if Vlinear < 0.018
   *    Vnonlinear = 4.500 * Vlinear
   *  else
   *    Vnonlinear = 1.099 * (Vlinear)^(0.45) – 0.099
   */
  HAL_COLOR_MODE_STANDARD_BT601_525 = 3,

  /*
   * Primaries:
   *                  x       y
   *  green           0.310   0.595
   *  blue            0.155   0.070
   *  red             0.630   0.340
   *  white (D65)     0.3127  0.3290
   *
   *  Use the unadjusted KR = 0.212, KB = 0.087 luminance interpretation
   *  for RGB conversion (as in SMPTE 240M).
   *
   * Gamma Correction (GC):
   *
   *  if Vlinear < 0.018
   *    Vnonlinear = 4.500 * Vlinear
   *  else
   *    Vnonlinear = 1.099 * (Vlinear)^(0.45) – 0.099
   */
  HAL_COLOR_MODE_STANDARD_BT601_525_UNADJUSTED = 4,

  /*
   * HAL_COLOR_MODE_REC709 corresponds with display settings that implement
   * the ITU-R Recommendation BT.709 / Rec. 709 for high-definition television.
   * Rendering Intent: Colorimetric
   * Primaries:
   *                  x       y
   *  green           0.300   0.600
   *  blue            0.150   0.060
   *  red             0.640   0.330
   *  white (D65)     0.3127  0.3290
   *
   * HDTV REC709 Inverse Gamma Correction (IGC): V represents normalized
   * (with [0 to 1] range) value of R, G, or B.
   *
   *  if Vnonlinear < 0.081
   *    Vlinear = Vnonlinear / 4.5
   *  else
   *    Vlinear = ((Vnonlinear + 0.099) / 1.099) ^ (1/0.45)
   *
   * HDTV REC709 Gamma Correction (GC):
   *
   *  if Vlinear < 0.018
   *    Vnonlinear = 4.5 * Vlinear
   *  else
   *    Vnonlinear = 1.099 * (Vlinear) ^ 0.45 – 0.099
   */
  HAL_COLOR_MODE_STANDARD_BT709 = 5,

  /*
   * HAL_COLOR_MODE_DCI_P3 corresponds with display settings that implement
   * SMPTE EG 432-1 and SMPTE RP 431-2
   * Rendering Intent: Colorimetric
   * Primaries:
   *                  x       y
   *  green           0.265   0.690
   *  blue            0.150   0.060
   *  red             0.680   0.320
   *  white (D65)     0.3127  0.3290
   *
   * Gamma: 2.2
   */
  HAL_COLOR_MODE_DCI_P3 = 6,

  /*
   * HAL_COLOR_MODE_SRGB corresponds with display settings that implement
   * the sRGB color space. Uses the same primaries as ITU-R Recommendation
   * BT.709
   * Rendering Intent: Colorimetric
   * Primaries:
   *                  x       y
   *  green           0.300   0.600
   *  blue            0.150   0.060
   *  red             0.640   0.330
   *  white (D65)     0.3127  0.3290
   *
   * PC/Internet (sRGB) Inverse Gamma Correction (IGC):
   *
   *  if Vnonlinear ≤ 0.03928
   *    Vlinear = Vnonlinear / 12.92
   *  else
   *    Vlinear = ((Vnonlinear + 0.055)/1.055) ^ 2.4
   *
   * PC/Internet (sRGB) Gamma Correction (GC):
   *
   *  if Vlinear ≤ 0.0031308
   *    Vnonlinear = 12.92 * Vlinear
   *  else
   *    Vnonlinear = 1.055 * (Vlinear)^(1/2.4) – 0.055
   */
  HAL_COLOR_MODE_SRGB = 7,

  /*
   * HAL_COLOR_MODE_ADOBE_RGB corresponds with the RGB color space developed
   * by Adobe Systems, Inc. in 1998.
   * Rendering Intent: Colorimetric
   * Primaries:
   *                  x       y
   *  green           0.210   0.710
   *  blue            0.150   0.060
   *  red             0.640   0.330
   *  white (D65)     0.3127  0.3290
   *
   * Gamma: 2.2
   */
  HAL_COLOR_MODE_ADOBE_RGB = 8

} android_color_mode_t;

/*
 * Color transforms that may be applied by hardware composer to the whole
 * display.
 */
typedef enum android_color_transform {
    /* Applies no transform to the output color */
    HAL_COLOR_TRANSFORM_IDENTITY = 0,

    /* Applies an arbitrary transform defined by a 4x4 affine matrix */
    HAL_COLOR_TRANSFORM_ARBITRARY_MATRIX = 1,

    /* Applies a transform that inverts the value or luminance of the color, but
     * does not modify hue or saturation */
    HAL_COLOR_TRANSFORM_VALUE_INVERSE = 2,

    /* Applies a transform that maps all colors to shades of gray */
    HAL_COLOR_TRANSFORM_GRAYSCALE = 3,

    /* Applies a transform which corrects for protanopic color blindness */
    HAL_COLOR_TRANSFORM_CORRECT_PROTANOPIA = 4,

    /* Applies a transform which corrects for deuteranopic color blindness */
    HAL_COLOR_TRANSFORM_CORRECT_DEUTERANOPIA = 5,

    /* Applies a transform which corrects for tritanopic color blindness */
    HAL_COLOR_TRANSFORM_CORRECT_TRITANOPIA = 6
} android_color_transform_t;

/*
 * Supported HDR formats. Must be kept in sync with equivalents in Display.java.
 */
typedef enum android_hdr {
    /* Device supports Dolby Vision HDR */
    HAL_HDR_DOLBY_VISION = 1,

    /* Device supports HDR10 */
    HAL_HDR_HDR10 = 2,

    /* Device supports hybrid log-gamma HDR */
    HAL_HDR_HLG = 3
} android_hdr_t;

#ifdef __cplusplus
}
#endif

#endif /* SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H */