graphics/composer/2.4/IComposerClient.hal

/*
 * Copyright 2019 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@2.4;

import IComposerCallback;
import @2.1::Config;
import @2.1::Display;
import @2.1::Error;
import @2.1::IComposerClient;
import @2.3::IComposerClient;

interface IComposerClient extends @2.3::IComposerClient {
    /**
     * Display attributes queryable through getDisplayAttribute_2_4.
     */
    enum Attribute : @2.1::IComposerClient.Attribute {
        /**
         * The configuration group ID (as int32_t) this config is associated to.
         * Switching between configurations within the same group may be done seamlessly
         * in some conditions via setActiveConfigWithConstraints.
         */
        CONFIG_GROUP = 7,
    };

    /**
     * Required capabilities which are supported by the display. The
     * particular set of supported capabilities for a given display may be
     * retrieved using getDisplayCapabilities.
     */
    enum DisplayCapability : @2.3::IComposerClient.DisplayCapability {
        /**
         * Indicates that the display supports protected contents.
         * When returned, hardware composer must be able to accept client target
         * with protected buffers.
         */
        PROTECTED_CONTENTS = 4,

        /**
         * Indicates that both the composer HAL implementation and the given display
         * support a low latency mode, such as HDMI 2.1 Auto Low Latency Mode.
         */
        AUTO_LOW_LATENCY_MODE = 5,
    };

    /**
     * Supersedes {@link @2.1::IComposerClient.DisplayType}.
     */
    enum DisplayConnectionType : uint32_t {
        /**
         * Display is connected through internal port, e.g. DSI, eDP.
         */
        INTERNAL = 0,
        /**
         * Display is connected through external port, e.g. HDMI, DisplayPort.
         */
        EXTERNAL = 1,
    };

    enum ContentType : uint32_t {
        NONE = 0,

        /**
         * These modes correspond to those found in the HDMI 1.4 specification.
         */
        GRAPHICS = 1,
        PHOTO = 2,
        CINEMA = 3,
        GAME = 4,
    };

    /**
     * Constraints for changing vsync period.
     */
    struct VsyncPeriodChangeConstraints {
        /**
         * Time in CLOCK_MONOTONIC after which the vsync period may change
         * (i.e., the vsync period must not change before this time).
         */
        int64_t desiredTimeNanos;

        /**
         * If true, requires that the vsync period change must happen seamlessly without
         * a noticeable visual artifact.
         */
        bool seamlessRequired;
    };

    /**
     * Provides a IComposerCallback object for the device to call.
     *
     * This function must be called only once.
     *
     * @param callback is the IComposerCallback object.
     */
    registerCallback_2_4(IComposerCallback callback);

    /**
     * Provides a list of supported capabilities (as described in the
     * definition of DisplayCapability above). This list must not change after
     * initialization.
     *
     * @return error is NONE upon success. Otherwise,
     *     BAD_DISPLAY when an invalid display handle was passed in.
     * @return capabilities is a list of supported capabilities.
     */
    getDisplayCapabilities_2_4(Display display)
        generates (Error error, vec<DisplayCapability> capabilities);

    /**
     * Returns whether the given physical display is internal or external.
     *
     * @return error is NONE upon success. Otherwise,
     *     BAD_DISPLAY when the given display is invalid or virtual.
     * @return type is the connection type of the display.
     */
    getDisplayConnectionType(Display display) generates (Error error, DisplayConnectionType type);

    /**
     * Returns a display attribute value for a particular display
     * configuration.
     *
     * @param display is the display to query.
     * @param config is the display configuration for which to return
     *        attribute values.
     * @return error is NONE upon success. Otherwise,
     *         BAD_DISPLAY when an invalid display handle was passed in.
     *         BAD_CONFIG when config does not name a valid configuration for
     *                    this display.
     *         BAD_PARAMETER when attribute is unrecognized.
     *         UNSUPPORTED when attribute cannot be queried for the config.
     * @return value is the value of the attribute.
     */
    getDisplayAttribute_2_4(Display display, Config config, Attribute attribute)
        generates (Error error, int32_t value);

    /**
     * Retrieves which vsync period the display is currently using.
     *
     * If no display configuration is currently active, this function must
     * return BAD_CONFIG. If the vsync period is about to change due to a
     * setActiveConfigWithConstraints call, this function must return the current vsync period
     * until the change takes place.
     *
     * @param display is the display for which the vsync period is queried.
     * @return error is NONE upon success. Otherwise,
     *         BAD_DISPLAY when an invalid display handle was passed in.
     *         BAD_CONFIG when no configuration is currently active.
     * @return vsyncPeriodNanos is the current vsync period of the display.
     */
    getDisplayVsyncPeriod(Display display)
        generates (Error error, VsyncPeriodNanos vsyncPeriodNanos);

    /**
     * Sets the active configuration and the refresh rate for this display.
     * If the new config shares the same config group as the current config,
     * only the vsync period shall change.
     * Upon returning, the given display configuration, except vsync period, must be active and
     * remain so until either this function is called again or the display is disconnected.
     * When the display starts to refresh at the new vsync period, onVsync_2_4 callback must be
     * called with the new vsync period.
     *
     * @param display is the display for which the active config is set.
     * @param config is the new display configuration.
     * @param vsyncPeriodChangeConstraints are the constraints required for changing vsync period.
     *
     * @return error is NONE upon success. Otherwise,
     *         BAD_DISPLAY when an invalid display handle was passed in.
     *         BAD_CONFIG when the configuration handle passed in is not valid
     *                    for this display.
     *         SEAMLESS_NOT_ALLOWED when seamlessRequired was true but config provided doesn't
     *                              share the same config group as the current config.
     *         SEAMLESS_NOT_POSSIBLE when seamlessRequired was true but the display cannot achieve
     *                               the vsync period change without a noticeable visual artifact.
     *                               When the conditions change and it may be possible to change
     *                               the vsync period seamlessly, onSeamlessPossible callback
     *                               must be called to indicate that caller should retry.
     * @return timeline is the timeline for the vsync period change.
     */
    setActiveConfigWithConstraints(Display display, Config config,
        VsyncPeriodChangeConstraints vsyncPeriodChangeConstraints)
        generates (Error error, VsyncPeriodChangeTimeline timeline);

    /**
     * Requests the display to enable/disable its low latency mode.
     *
     * If the display is connected via HDMI 2.1, then Auto Low Latency Mode should be triggered. If
     * the display is internally connected and a custom low latency mode is available, that should
     * be triggered.
     *
     * This function should only be called if the display reports support for
     * DisplayCapability::AUTO_LOW_LATENCY_MODE from getDisplayCapabilities_2_4.
     *
     * @return error is NONE upon success. Otherwise,
     *     BAD_DISPLAY when an invalid display handle was passed in.
     *     UNSUPPORTED when AUTO_LOW_LATENCY_MODE is not supported by the composer
     *         implementation or the given display
     */
    setAutoLowLatencyMode(Display display, bool on)
        generates (Error error);

    /**
     * Provides a list of all the content types supported by this display (any of
     * ContentType::{GRAPHICS, PHOTO, CINEMA, GAME}). This list must not change after
     * initialization.
     *
     * Content types are introduced in HDMI 1.4 and supporting them is optional. The
     * ContentType::NONE is always supported and will not be returned by this method..
     *
     * @return error is NONE upon success. Otherwise,
     *     BAD_DISPLAY when an invalid display handle was passed in.
     * @return supportedContentTypes is a list of supported content types.
     */
    getSupportedContentTypes(Display display)
        generates(Error error, vec<ContentType> supportedContentTypes);

    /**
     * Instructs the connected display that the content being shown is of the given type - one of
     * GRAPHICS, PHOTO, CINEMA, GAME.
     *
     * Content types are introduced in HDMI 1.4 and supporting them is optional. If they are
     * supported, this signal should switch the display to a mode that is optimal for the given
     * type of content. See HDMI 1.4 specification for more information.
     *
     * If the display is internally connected (not through HDMI), and such modes are available,
     * this method should trigger them.
     *
     * This function should only be called if the display reports support for the corresponding
     * content type (ContentType::{GRAPHICS, PHOTO, CINEMA, GAME}) from getSupportedContentTypes.
     * ContentType::NONE is supported by default and can always be set.
     *
     * @return error is NONE upon success. Otherwise,
     *     BAD_DISPLAY when an invalid display handle was passed in.
     *     UNSUPPORTED when the given content type is not supported by the composer
     *         implementation or the given display
     */
    setContentType(Display display, ContentType type)
        generates (Error error);
};