1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdio.h> // stdio.h must appear before jpeglib.h
18 #include <jpeglib.h>
19
20 #include <android-base/logging.h>
21 #include "host/frontend/vnc_server/jpeg_compressor.h"
22 #include "host/frontend/vnc_server/vnc_utils.h"
23 #include "host/libs/screen_connector/screen_connector.h"
24
25 using cuttlefish::vnc::JpegCompressor;
26
27 namespace {
InitCinfo(jpeg_compress_struct * cinfo,jpeg_error_mgr * err,std::uint16_t width,std::uint16_t height,int jpeg_quality)28 void InitCinfo(jpeg_compress_struct* cinfo, jpeg_error_mgr* err,
29 std::uint16_t width, std::uint16_t height, int jpeg_quality) {
30 cinfo->err = jpeg_std_error(err);
31 jpeg_create_compress(cinfo);
32
33 cinfo->image_width = width;
34 cinfo->image_height = height;
35 cinfo->input_components = cuttlefish::ScreenConnectorInfo::BytesPerPixel();
36 cinfo->in_color_space = JCS_EXT_RGBX;
37
38 jpeg_set_defaults(cinfo);
39 jpeg_set_quality(cinfo, jpeg_quality, true);
40 }
41 } // namespace
42
Compress(const Message & frame,int jpeg_quality,std::uint16_t x,std::uint16_t y,std::uint16_t width,std::uint16_t height,int stride)43 cuttlefish::Message JpegCompressor::Compress(const Message& frame,
44 int jpeg_quality, std::uint16_t x,
45 std::uint16_t y, std::uint16_t width,
46 std::uint16_t height,
47 int stride) {
48 jpeg_compress_struct cinfo{};
49 jpeg_error_mgr err{};
50 InitCinfo(&cinfo, &err, width, height, jpeg_quality);
51
52 auto* compression_buffer = buffer_.get();
53 auto compression_buffer_size = buffer_capacity_;
54 jpeg_mem_dest(&cinfo, &compression_buffer, &compression_buffer_size);
55 jpeg_start_compress(&cinfo, true);
56
57 while (cinfo.next_scanline < cinfo.image_height) {
58 auto row = static_cast<JSAMPROW>(const_cast<std::uint8_t*>(
59 &frame[(y * stride) +
60 (cinfo.next_scanline * stride) +
61 (x * cuttlefish::ScreenConnectorInfo::BytesPerPixel())]));
62 jpeg_write_scanlines(&cinfo, &row, 1);
63 }
64 jpeg_finish_compress(&cinfo);
65 jpeg_destroy_compress(&cinfo);
66
67 UpdateBuffer(compression_buffer, compression_buffer_size);
68 return {compression_buffer, compression_buffer + compression_buffer_size};
69 }
70
UpdateBuffer(std::uint8_t * compression_buffer,unsigned long compression_buffer_size)71 void JpegCompressor::UpdateBuffer(std::uint8_t* compression_buffer,
72 unsigned long compression_buffer_size) {
73 if (buffer_.get() != compression_buffer) {
74 buffer_capacity_ = compression_buffer_size;
75 buffer_.reset(compression_buffer);
76 }
77 }
78