| #pragma once |
| /* |
| * Copyright (C) 2017 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. |
| */ |
| |
| #include <memory> |
| |
| #include "common/vsoc/lib/typed_region_view.h" |
| #include "common/vsoc/shm/graphics.h" |
| #include "common/vsoc/shm/screen_layout.h" |
| #include "uapi/vsoc_shm.h" |
| |
| namespace vsoc { |
| namespace screen { |
| |
| // Provides information related to the device's screen. Allows to query screen |
| // properties such as resolution and dpi, as well as subscribe/notify to/of |
| // changes on the screen contents. It also holds the contents of the display. |
| class ScreenRegionView |
| : public vsoc::TypedRegionView<ScreenRegionView, |
| vsoc::layout::screen::ScreenLayout> { |
| public: |
| static int align(int input) { |
| auto constexpr alignment = 16; |
| return (input + alignment - 1) & -alignment; |
| } |
| |
| // Screen width in pixels |
| int x_res() const { return data().x_res; } |
| |
| // Screen height in pixels |
| int y_res() const { return data().y_res; } |
| |
| // Dots per inch |
| int dpi() const { return data().dpi; } |
| |
| // Refresh rate in Hertz |
| int refresh_rate_hz() const { return data().refresh_rate_hz; } |
| |
| uint32_t pixel_format() const { return kFbPixelFormat; } |
| |
| uint32_t bytes_per_pixel() const { |
| return vsoc::PixelFormatProperties<kFbPixelFormat>::bytes_per_pixel; |
| } |
| |
| int line_length() const { return align(x_res() * bytes_per_pixel()); } |
| |
| size_t buffer_size() const { |
| return (align(x_res() * bytes_per_pixel()) * y_res()) + kSwiftShaderPadding; |
| } |
| |
| int number_of_buffers() const; |
| |
| // Gets a pointer to the beginning of a buffer. Does not perform any bound |
| // checks on the index. |
| void* GetBuffer(int buffer_idx); |
| |
| // Broadcasts a new frame. |
| // buffer_idx is the index of the buffer containing the composed screen, it's |
| // a number in the range [0, number_of_buffers() - 1]. |
| // Stats holds performance information of the last composition, can be null. |
| void BroadcastNewFrame( |
| int buffer_idx, |
| const vsoc::layout::screen::CompositionStats* stats = nullptr); |
| |
| // Waits for a new frame (one with a different seq_num than last one we saw). |
| // Returns the index of the buffer containing the new frame or a negative |
| // number if there was an error, stores the new sequential number in |
| // *last_seq_num. The frame sequential numbers will be provided by the |
| // hwcomposer and expected to increase monotonically over time (though it's |
| // not a hard requirement), this numbers are guaranteed to be non-zero when a |
| // valid frame is available. Performance statistics are returned through the |
| // stats parameter when it's not null. |
| int WaitForNewFrameSince( |
| uint32_t* last_seq_num, |
| vsoc::layout::screen::CompositionStats* stats = nullptr); |
| |
| using Pixel = uint32_t; |
| static constexpr int kSwiftShaderPadding = 4; |
| static constexpr int kRedShift = 0; |
| static constexpr int kGreenShift = 8; |
| static constexpr int kBlueShift = 16; |
| static constexpr int kRedBits = 8; |
| static constexpr int kGreenBits = 8; |
| static constexpr int kBlueBits = 8; |
| static constexpr uint32_t kFbPixelFormat = vsoc::VSOC_PIXEL_FORMAT_RGBA_8888; |
| |
| protected: |
| const uint8_t* first_buffer() const; |
| }; |
| } // namespace screen |
| } // namespace vsoc |