libs/nativewindow/ANativeWindow.cpp

/*
 * Copyright (C) 2010 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.
 */

#define LOG_TAG "ANativeWindow"

#include <android/native_window.h>
#include <system/window.h>

void ANativeWindow_acquire(ANativeWindow* window) {
    window->incStrong((void*)ANativeWindow_acquire);
}

void ANativeWindow_release(ANativeWindow* window) {
    window->decStrong((void*)ANativeWindow_release);
}

static int32_t getWindowProp(ANativeWindow* window, int what) {
    int value;
    int res = window->query(window, what, &value);
    return res < 0 ? res : value;
}

int32_t ANativeWindow_getWidth(ANativeWindow* window) {
    return getWindowProp(window, NATIVE_WINDOW_WIDTH);
}

int32_t ANativeWindow_getHeight(ANativeWindow* window) {
    return getWindowProp(window, NATIVE_WINDOW_HEIGHT);
}

int32_t ANativeWindow_getFormat(ANativeWindow* window) {
    return getWindowProp(window, NATIVE_WINDOW_FORMAT);
}

int32_t ANativeWindow_setBuffersGeometry(ANativeWindow* window, int32_t width,
        int32_t height, int32_t format) {
    int32_t err = native_window_set_buffers_format(window, format);
    if (!err) {
        err = native_window_set_buffers_user_dimensions(window, width, height);
        if (!err) {
            int mode = NATIVE_WINDOW_SCALING_MODE_FREEZE;
            if (width && height) {
                mode = NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW;
            }
            err = native_window_set_scaling_mode(window, mode);
        }
    }
    return err;
}

int32_t ANativeWindow_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
        ARect* inOutDirtyBounds) {
    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
}

int32_t ANativeWindow_unlockAndPost(ANativeWindow* window) {
    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
}

int32_t ANativeWindow_setBuffersTransform(ANativeWindow* window, int32_t transform) {
    static_assert(ANATIVEWINDOW_TRANSFORM_MIRROR_HORIZONTAL == NATIVE_WINDOW_TRANSFORM_FLIP_H);
    static_assert(ANATIVEWINDOW_TRANSFORM_MIRROR_VERTICAL == NATIVE_WINDOW_TRANSFORM_FLIP_V);
    static_assert(ANATIVEWINDOW_TRANSFORM_ROTATE_90 == NATIVE_WINDOW_TRANSFORM_ROT_90);

    constexpr int32_t kAllTransformBits =
            ANATIVEWINDOW_TRANSFORM_MIRROR_HORIZONTAL |
            ANATIVEWINDOW_TRANSFORM_MIRROR_VERTICAL |
            ANATIVEWINDOW_TRANSFORM_ROTATE_90;
    if (!window || !getWindowProp(window, NATIVE_WINDOW_IS_VALID))
        return -EINVAL;
    if ((transform & ~kAllTransformBits) != 0)
        return -EINVAL;

    return native_window_set_buffers_transform(window, transform);
}