1 #pragma once 2 /* 3 * Copyright (C) 2017 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 #include <memory> 19 20 #include "common/vsoc/lib/typed_region_view.h" 21 #include "common/vsoc/shm/graphics.h" 22 #include "common/vsoc/shm/screen_layout.h" 23 #include "uapi/vsoc_shm.h" 24 25 namespace vsoc { 26 namespace screen { 27 28 // Provides information related to the device's screen. Allows to query screen 29 // properties such as resolution and dpi, as well as subscribe/notify to/of 30 // changes on the screen contents. It also holds the contents of the display. 31 class ScreenRegionView 32 : public vsoc::TypedRegionView<ScreenRegionView, 33 vsoc::layout::screen::ScreenLayout> { 34 public: 35 static int align(int input, int alignment = kAlignment) { 36 return (input + alignment - 1) & -alignment; 37 } 38 39 // Screen width in pixels 40 int x_res() const { return data().x_res; } 41 42 // Screen height in pixels 43 int y_res() const { return data().y_res; } 44 45 // Dots per inch 46 int dpi() const { return data().dpi; } 47 48 // Refresh rate in Hertz 49 int refresh_rate_hz() const { return data().refresh_rate_hz; } 50 51 uint32_t pixel_format() const { return kFbPixelFormat; } 52 53 uint32_t bytes_per_pixel() const { 54 return vsoc::PixelFormatProperties<kFbPixelFormat>::bytes_per_pixel; 55 } 56 57 int line_length() const { return align(x_res() * bytes_per_pixel()); } 58 59 size_t buffer_size() const { 60 return (align(x_res() * bytes_per_pixel()) * y_res()) + kSwiftShaderPadding; 61 } 62 63 int number_of_buffers() const; 64 65 // Gets a pointer to the beginning of a buffer. Does not perform any bound 66 // checks on the index. 67 void* GetBuffer(int buffer_idx); 68 69 // Broadcasts a new frame. 70 // buffer_idx is the index of the buffer containing the composed screen, it's 71 // a number in the range [0, number_of_buffers() - 1]. 72 // Stats holds performance information of the last composition, can be null. 73 void BroadcastNewFrame( 74 int buffer_idx, 75 const vsoc::layout::screen::CompositionStats* stats = nullptr); 76 77 // Waits for a new frame (one with a different seq_num than last one we saw). 78 // Returns the index of the buffer containing the new frame or a negative 79 // number if there was an error, stores the new sequential number in 80 // *last_seq_num. The frame sequential numbers will be provided by the 81 // hwcomposer and expected to increase monotonically over time (though it's 82 // not a hard requirement), this numbers are guaranteed to be non-zero when a 83 // valid frame is available. Performance statistics are returned through the 84 // stats parameter when it's not null. 85 int WaitForNewFrameSince( 86 uint32_t* last_seq_num, 87 vsoc::layout::screen::CompositionStats* stats = nullptr); 88 89 using Pixel = uint32_t; 90 static constexpr int kSwiftShaderPadding = 4; 91 static constexpr int kRedShift = 0; 92 static constexpr int kGreenShift = 8; 93 static constexpr int kBlueShift = 16; 94 static constexpr int kRedBits = 8; 95 static constexpr int kGreenBits = 8; 96 static constexpr int kBlueBits = 8; 97 static constexpr uint32_t kFbPixelFormat = vsoc::VSOC_PIXEL_FORMAT_RGBA_8888; 98 static constexpr int kAlignment = 8; 99 100 protected: 101 const uint8_t* first_buffer() const; 102 }; 103 } // namespace screen 104 } // namespace vsoc 105
