graphics/composer/2.2/IComposerClient.hal

/*
 * Copyright (C) 2018 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.
 */

package android.hardware.graphics.composer@2.2;

import android.hardware.graphics.common@1.0::PixelFormat;
import android.hardware.graphics.common@1.0::Dataspace;
import @2.1::IComposerClient;
import @2.1::Display;
import @2.1::Error;

interface IComposerClient extends @2.1::IComposerClient {

    enum PowerMode : @2.1::IComposerClient.PowerMode {
        /**
         * The display is configured as in ON but may stop applying display
         * updates from the client. This is effectively a hint to the device
         * that drawing to the display has been suspended and that the the
         * device must remain on and continue displaying its current contents
         * indefinitely until the power mode changes.
         *
         * This mode may also be used as a signal to enable hardware-based
         * functionality to take over the display and manage it autonomously
         * to implement a low power always-on display.
         */
        ON_SUSPEND = 4
    };

    /**
     * Following enums define keys for metadata defined by SMPTE ST 2086:2014
     * and CTA 861.3.
     */
    enum PerFrameMetadataKey : int32_t {
        /** SMPTE ST 2084:2014.
         * Coordinates defined in CIE 1931 xy chromaticity space
         */
        /** SMPTE ST 2084:2014 */
        DISPLAY_RED_PRIMARY_X,
        /** SMPTE ST 2084:2014 */
        DISPLAY_RED_PRIMARY_Y,
        /** SMPTE ST 2084:2014 */
        DISPLAY_GREEN_PRIMARY_X,
        /** SMPTE ST 2084:2014 */
        DISPLAY_GREEN_PRIMARY_Y,
        /** SMPTE ST 2084:2014 */
        DISPLAY_BLUE_PRIMARY_X,
        /** SMPTE ST 2084:2014 */
        DISPLAY_BLUE_PRIMARY_Y,
        /** SMPTE ST 2084:2014 */
        WHITE_POINT_X,
        /** SMPTE ST 2084:2014 */
        WHITE_POINT_Y,
        /** SMPTE ST 2084:2014.
         * Units: nits
         * max as defined by ST 2048: 10,000 nits
         */
        MAX_LUMINANCE,
        /** SMPTE ST 2084:2014 */
        MIN_LUMINANCE,
        /** CTA 861.3 */
        MAX_CONTENT_LIGHT_LEVEL,
        /** CTA 861.3 */
        MAX_FRAME_AVERAGE_LIGHT_LEVEL,
    };

    struct PerFrameMetadata {
        PerFrameMetadataKey key;
        float value;
    };

    struct FloatColor {
        float r;
        float g;
        float b;
        float a;
    };

    enum Command : @2.1::IComposerClient.Command {
        /**
         * setPerFrameMetadata(Display display, vec<PerFrameMetadata> data)
         * Sets the PerFrameMetadata for the display. This metadata must be used
         * by the implementation to better tone map content to that display.
         *
         * This is a method that may be called every frame. Thus it's
         * implemented using buffered transport.
         * SET_PER_FRAME_METADATA is the command used by the buffered transport
         * mechanism.
         */
        SET_PER_FRAME_METADATA = 0x207 << @2.1::IComposerClient.Command:OPCODE_SHIFT,

        /**
         * SET_LAYER_COLOR has this pseudo prototype
         *
         *   setLayerColor(FloatColor color);
         *
         * Sets the color of the given layer. If the composition type of the layer
         * is not Composition::SOLID_COLOR, this call must succeed and have no
         * other effect.
         *
         * @param color is the new color using float type.
         */
        SET_LAYER_FLOAT_COLOR = 0x40c << @2.1::IComposerClient.Command:OPCODE_SHIFT,
    };

    /**
     * Returns the PerFrameMetadataKeys that are supported by this device.
     *
     * @param display is the display on which to create the layer.
     * @return keys is the vector of PerFrameMetadataKey keys that are
     *        supported by this device.
     * @return error is NONE upon success. Otherwise,
     *         UNSUPPORTED if not supported on underlying HAL
     */
    getPerFrameMetadataKeys(Display display)
        generates (Error error,
                   vec<PerFrameMetadataKey> keys);

    /**
     * getReadbackBufferAttributes
     * Returns the format which should be used when allocating a buffer for use by
     * device readback as well as the dataspace in which its contents should be
     * interpreted.
     *
     * The width and height of this buffer must be those of the currently-active
     * display configuration, and the usage flags must consist of the following:
     *   BufferUsage::CPU_READ | BufferUsage::GPU_TEXTURE |
     *   BufferUsage::COMPOSER_OUTPUT
     *
     * The format and dataspace provided must be sufficient such that if a
     * correctly-configured buffer is passed into setReadbackBuffer, filled by
     * the device, and then displayed by the client as a full-screen buffer, the
     * output of the display remains the same (subject to the note about protected
     * content in the description of setReadbackBuffer).
     *
     * Parameters:
     * @param display - the display on which to create the layer.
     *
     * @return format - the format the client should use when allocating a device
     *       readback buffer
     * @return dataspace - the dataspace to use when interpreting the
     *       contents of a device readback buffer
     * @return error is NONE upon success. Otherwise,
     *         BAD_DISPLAY when an invalid display handle was passed in.
     *         UNSUPPORTED if not supported on underlying HAL
     *
     * See also:
     *   setReadbackBuffer
     *   getReadbackBufferFence
     */
    getReadbackBufferAttributes(Display display)
        generates (Error error,
                   PixelFormat format,
                   Dataspace dataspace);

    /**
     * getReadbackBufferFence
     * Returns an acquire sync fence file descriptor which must signal when the
     * buffer provided to setReadbackBuffer has been filled by the device and is
     * safe for the client to read.
     *
     * If it is already safe to read from this buffer, -1 may be returned instead.
     * The client takes ownership of this file descriptor and is responsible for
     * closing it when it is no longer needed.
     *
     * This function must be called immediately after the composition cycle being
     * captured into the readback buffer. The complete ordering of a readback buffer
     * capture is as follows:
     *
     *   getReadbackBufferAttributes
     *   // Readback buffer is allocated
     *   // Many frames may pass
     *
     *   setReadbackBuffer
     *   validateDisplay
     *   presentDisplay
     *   getReadbackBufferFence
     *   // Implicitly wait on the acquire fence before accessing the buffer
     *
     * Parameters:
     * @param display - the display on which to create the layer.
     *
     * @return acquireFence - a sync fence file descriptor as described above; pointer
     *       must be non-NULL
     * @return error - is HWC2_ERROR_NONE or one of the following errors:
     *         BAD_DISPLAY - an invalid display handle was passed in
     *         UNSUPPORTED if not supported on underlying HAL
     *
     * See also:
     *   getReadbackBufferAttributes
     *   setReadbackBuffer
     */
    getReadbackBufferFence(Display display)
                generates (Error error,
                           handle acquireFence);

    /**
     * setReadbackBuffer
     * Sets the readback buffer to be filled with the contents of the next
     * composition performed for this display (i.e., the contents present at the
     * time of the next validateDisplay/presentDisplay cycle).
     *
     * This buffer must have been allocated as described in
     * getReadbackBufferAttributes and is in the dataspace provided by the same.
     *
     * If there is hardware protected content on the display at the time of the next
     * composition, the area of the readback buffer covered by such content must be
     * completely black. Any areas of the buffer not covered by such content may
     * optionally be black as well.
     *
     * The release fence file descriptor provided works identically to the one
     * described for setOutputBuffer.
     *
     * This function must not be called between any call to validateDisplay and a
     * subsequent call to presentDisplay.
     *
     * Parameters:
     * @param display - the display on which to create the layer.
     * @param buffer - the new readback buffer
     * @param releaseFence - a sync fence file descriptor as described in setOutputBuffer
     *
     * @return error - is HWC2_ERROR_NONE or one of the following errors:
     *   HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
     *   HWC2_ERROR_BAD_PARAMETER - the new readback buffer handle was invalid
     *
     * See also:
     *   getReadbackBufferAttributes
     *   getReadbackBufferFence
     */
    setReadbackBuffer(Display display, handle buffer, handle releaseFence) generates (Error error);

    /**
     * setPowerMode_2_2
     * Sets the power mode of the given display. The transition must be
     * complete when this function returns. It is valid to call this function
     * multiple times with the same power mode.
     *
     * All displays must support PowerMode::ON and PowerMode::OFF.  Whether a
     * display supports PowerMode::DOZE or PowerMode::DOZE_SUSPEND may be
     * queried using getDozeSupport.
     *
     * @param display is the display to which the power mode is set.
     * @param mode is the new power mode.
     * @return error is NONE upon success. Otherwise,
     *         BAD_DISPLAY when an invalid display handle was passed in.
     *         BAD_PARAMETER when mode was not a valid power mode.
     *         UNSUPPORTED when mode is not supported on this display.
     */
    setPowerMode_2_2(Display display, PowerMode mode) generates (Error error);

};