graphics/composer/2.3/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@2.3;

import android.hardware.graphics.composer@2.1::IComposerClient.Command;
import @2.2::IComposerClient;
import @2.1::Display;
import @2.1::Error;

interface IComposerClient extends @2.2::IComposerClient {

    enum Command : @2.2::IComposerClient.Command {
        /**
         * SET_LAYER_COLOR_TRANSFORM has this pseudo prototype
         *
         *   setLayerColorTransform(float[16] matrix);
         *
         * This command has the following binary layout in bytes:
         *
         *     0 - 16 * 4: matrix
         *
         * Sets a matrix for color transform which will be applied on this layer
         * before composition.
         *
         * If the device is not capable of apply the matrix on this layer, it must force
         * this layer to client composition during VALIDATE_DISPLAY.
         *
         * The matrix provided is an affine color transformation of the following
         * form:
         *
         * |r.r r.g r.b 0|
         * |g.r g.g g.b 0|
         * |b.r b.g b.b 0|
         * |Tr  Tg  Tb  1|
         *
         * This matrix must be provided in row-major form:
         *
         * {r.r, r.g, r.b, 0, g.r, ...}.
         *
         * Given a matrix of this form and an input color [R_in, G_in, B_in],
         * the input color must first be converted to linear space
         * [R_linear, G_linear, B_linear], then the output linear color
         * [R_out_linear, G_out_linear, B_out_linear] will be:
         *
         * R_out_linear = R_linear * r.r + G_linear * g.r + B_linear * b.r + Tr
         * G_out_linear = R_linear * r.g + G_linear * g.g + B_linear * b.g + Tg
         * B_out_linear = R_linear * r.b + G_linear * g.b + B_linear * b.b + Tb
         *
         * [R_out_linear, G_out_linear, B_out_linear] must then be converted to
         * gamma space: [R_out, G_out, B_out] before blending.
         *
         * @param matrix is a 4x4 transform matrix (16 floats) as described above.
         */
        SET_LAYER_COLOR_TRANSFORM = 0x40d << @2.1::IComposerClient.Command:OPCODE_SHIFT,
    };

    /**
     * Returns the port and data that describe a physical display. The port is
     * a unique number that identifies a physical connector (e.g. eDP, HDMI)
     * for display output. The data blob is parsed to determine its format,
     * typically EDID 1.3 as specified in VESA E-EDID Standard Release A
     * Revision 1.
     *
     * @param display is the display to query.
     * @return error is NONE upon success. Otherwise,
     *         BAD_DISPLAY when an invalid display handle was passed in.
     *         UNSUPPORTED when identification data is unavailable.
     * @return port is the connector to which the display is connected.
     * @return data is the EDID 1.3 blob identifying the display.
     */
    @callflow(next="*")
    getDisplayIdentificationData(Display display)
               generates (Error error,
                          uint8_t port,
                          vec<uint8_t> data);

    /**
     * Executes commands from the input command message queue. Return values
     * generated by the input commands are written to the output command
     * message queue in the form of value commands.
     *
     * @param inLength is the length of input commands.
     * @param inHandles is an array of handles referenced by the input
     *        commands.
     * @return error is NONE upon success. Otherwise,
     *         BAD_PARAMETER when inLength is not equal to the length of
     *                       commands in the input command message queue.
     *         NO_RESOURCES when the output command message queue was not
     *                      properly drained.
     * @param outQueueChanged indicates whether the output command message
     *        queue has changed.
     * @param outLength is the length of output commands.
     * @param outHandles is an array of handles referenced by the output
     *        commands.
     */
    executeCommands_2_3(uint32_t inLength,
                        vec<handle> inHandles)
             generates (Error error,
                        bool outQueueChanged,
                        uint32_t outLength,
                        vec<handle> outHandles);
};