graphics/allocator/3.0/IAllocator.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.allocator@3.0;

import android.hardware.graphics.mapper@3.0;

interface IAllocator {
    /**
     * Retrieves implementation-defined debug information, which will be
     * displayed during, for example, `dumpsys SurfaceFlinger`.
     *
     * @return debugInfo is a string of debug information.
     */
    dumpDebugInfo() generates (string debugInfo);

    /**
     * Allocates buffers with the properties specified by the descriptor.
     *
     * Allocations should be optimized for usage bits provided in the
     * descriptor.
     *
     * @param descriptor Properties of the buffers to allocate. This must be
     *     obtained from IMapper::createDescriptor().
     * @param count The number of buffers to allocate.
     * @return error Error status of the call, which may be
     *     - `NONE` upon success.
     *     - `BAD_DESCRIPTOR` if the descriptor is invalid.
     *     - `NO_RESOURCES` if the allocation cannot be fulfilled at this time.
     *     - `UNSUPPORTED` if any of the properties encoded in the descriptor
     *       are not supported.
     * @return stride The number of pixels between two consecutive rows of
     *     an allocated buffer, when the concept of consecutive rows is defined.
     *     Otherwise, it has no meaning.
     * @return buffers Array of raw handles to the allocated buffers.
     */
    allocate(BufferDescriptor descriptor, uint32_t count)
        generates (Error error,
                   uint32_t stride,
                   vec<handle> buffers);
};