1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/capturer_gdi.h"
#include "gfx/rect.h"
namespace remoting {
// 3780 pixels per meter is equivalent to 96 DPI, typical on desktop monitors.
static const int kPixelsPerMeter = 3780;
// 24 bit RGB is 3 bytes per pixel.
static const int kBytesPerPixel = 3;
CapturerGdi::CapturerGdi()
: initialized_(false) {
}
CapturerGdi::~CapturerGdi() {
if (initialized_) {
for (int i = kNumBuffers - 1; i >= 0; i--) {
DeleteObject(target_bitmap_[i]);
}
}
}
void CapturerGdi::CaptureFullScreen(Task* done_task) {
dirty_rects_.clear();
CaptureImage();
dirty_rects_.push_back(gfx::Rect(width_, height_));
FinishCapture(done_task);
}
void CapturerGdi::CaptureDirtyRects(Task* done_task) {
dirty_rects_.clear();
CaptureImage();
// TODO(garykac): Diff old/new images and generate |dirty_rects_|.
// Currently, this just marks the entire screen as dirty.
dirty_rects_.push_back(gfx::Rect(width_, height_));
FinishCapture(done_task);
}
void CapturerGdi::CaptureRect(const gfx::Rect& rect, Task* done_task) {
dirty_rects_.clear();
CaptureImage();
dirty_rects_.push_back(rect);
FinishCapture(done_task);
}
void CapturerGdi::GetData(const uint8* planes[]) const {
planes[0] = static_cast<const uint8*>(buffers_[current_buffer_]);
planes[1] = planes[2] = NULL;
}
void CapturerGdi::GetDataStride(int strides[]) const {
// Only the first plane has data.
strides[0] = bytes_per_row_;
strides[1] = strides[2] = 0;
}
int CapturerGdi::GetWidth() const {
if (!width_)
width_ = GetSystemMetrics(SM_CXSCREEN);
return width_;
}
int CapturerGdi::GetHeight() const {
if (!height_)
height_ = GetSystemMetrics(SM_CYSCREEN);
return height_;
}
// TODO(fbarchard): handle error cases.
void CapturerGdi::InitializeBuffers() {
desktop_dc_ = GetDC(GetDesktopWindow());
memory_dc_ = CreateCompatibleDC(desktop_dc_);
// Create a bitmap to keep the desktop image.
width_ = GetSystemMetrics(SM_CXSCREEN);
height_ = GetSystemMetrics(SM_CYSCREEN);
int rounded_width = (width_ + 3) & (~3);
// Dimensions of screen.
pixel_format_ = chromotocol_pb::PixelFormatRgb24;
bytes_per_pixel_ = kBytesPerPixel;
bytes_per_row_ = rounded_width * bytes_per_pixel_;
// Create a device independant bitmap (DIB) that is the same size.
BITMAPINFO bmi;
memset(&bmi, 0, sizeof(bmi));
bmi.bmiHeader.biHeight = height_;
bmi.bmiHeader.biWidth = width_;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = bytes_per_pixel_ * 8;
bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
bmi.bmiHeader.biSizeImage = bytes_per_row_ * height_;
bmi.bmiHeader.biXPelsPerMeter = kPixelsPerMeter;
bmi.bmiHeader.biYPelsPerMeter = kPixelsPerMeter;
// Create memory for the buffers.
for (int i = 0; i < kNumBuffers; i++) {
target_bitmap_[i] = CreateDIBSection(desktop_dc_, &bmi, DIB_RGB_COLORS,
static_cast<void**>(&buffers_[i]),
NULL, 0);
}
initialized_ = true;
}
void CapturerGdi::CaptureImage() {
if (initialized_ == false) {
InitializeBuffers();
}
// Selection the target bitmap into the memory dc.
SelectObject(memory_dc_, target_bitmap_[current_buffer_]);
// And then copy the rect from desktop to memory.
BitBlt(memory_dc_, 0, 0, width_, height_, desktop_dc_, 0, 0,
SRCCOPY | CAPTUREBLT);
}
} // namespace remoting
|
