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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
// Copyright (c) 2009 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 "chrome/browser/renderer_host/backing_store.h"
#include "app/gfx/gdi_util.h"
#include "base/command_line.h"
#include "chrome/browser/renderer_host/render_widget_host.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/transport_dib.h"
namespace {
// Creates a dib conforming to the height/width/section parameters passed in.
HANDLE CreateDIB(HDC dc, int width, int height, int color_depth) {
BITMAPV5HEADER hdr = {0};
ZeroMemory(&hdr, sizeof(BITMAPV5HEADER));
// These values are shared with gfx::PlatformDevice
hdr.bV5Size = sizeof(BITMAPINFOHEADER);
hdr.bV5Width = width;
hdr.bV5Height = -height; // minus means top-down bitmap
hdr.bV5Planes = 1;
hdr.bV5BitCount = color_depth;
hdr.bV5Compression = BI_RGB; // no compression
hdr.bV5SizeImage = 0;
hdr.bV5XPelsPerMeter = 1;
hdr.bV5YPelsPerMeter = 1;
hdr.bV5ClrUsed = 0;
hdr.bV5ClrImportant = 0;
if (BackingStore::ColorManagementEnabled()) {
hdr.bV5CSType = LCS_sRGB;
hdr.bV5Intent = LCS_GM_IMAGES;
}
void* data = NULL;
HANDLE dib = CreateDIBSection(dc, reinterpret_cast<BITMAPINFO*>(&hdr),
0, &data, NULL, 0);
DCHECK(data);
return dib;
}
void CallStretchDIBits(HDC hdc, int dest_x, int dest_y, int dest_w, int dest_h,
int src_x, int src_y, int src_w, int src_h, void* pixels,
const BITMAPINFO* bitmap_info) {
// When blitting a rectangle that touches the bottom, left corner of the
// bitmap, StretchDIBits looks at it top-down! For more details, see
// http://wiki.allegro.cc/index.php?title=StretchDIBits.
int rv;
int bitmap_h = -bitmap_info->bmiHeader.biHeight;
int bottom_up_src_y = bitmap_h - src_y - src_h;
if (bottom_up_src_y == 0 && src_x == 0 && src_h != bitmap_h) {
rv = StretchDIBits(hdc,
dest_x, dest_h + dest_y - 1, dest_w, -dest_h,
src_x, bitmap_h - src_y + 1, src_w, -src_h,
pixels, bitmap_info, DIB_RGB_COLORS, SRCCOPY);
} else {
rv = StretchDIBits(hdc,
dest_x, dest_y, dest_w, dest_h,
src_x, bottom_up_src_y, src_w, src_h,
pixels, bitmap_info, DIB_RGB_COLORS, SRCCOPY);
}
DCHECK(rv != GDI_ERROR);
}
} // namespace
// BackingStore (Windows) ------------------------------------------------------
BackingStore::BackingStore(RenderWidgetHost* widget, const gfx::Size& size)
: render_widget_host_(widget),
size_(size),
backing_store_dib_(NULL),
original_bitmap_(NULL) {
HDC screen_dc = ::GetDC(NULL);
color_depth_ = ::GetDeviceCaps(screen_dc, BITSPIXEL);
// Color depths less than 16 bpp require a palette to be specified. Instead,
// we specify the desired color depth as 16 which lets the OS to come up
// with an approximation.
if (color_depth_ < 16)
color_depth_ = 16;
hdc_ = CreateCompatibleDC(screen_dc);
ReleaseDC(NULL, screen_dc);
}
BackingStore::~BackingStore() {
DCHECK(hdc_);
if (original_bitmap_) {
SelectObject(hdc_, original_bitmap_);
}
if (backing_store_dib_) {
DeleteObject(backing_store_dib_);
backing_store_dib_ = NULL;
}
DeleteDC(hdc_);
}
size_t BackingStore::MemorySize() {
return size_.GetArea() * (color_depth_ / 8);
}
// static
bool BackingStore::ColorManagementEnabled() {
static bool enabled = false;
static bool checked = false;
if (!checked) {
checked = true;
const CommandLine& command = *CommandLine::ForCurrentProcess();
enabled = command.HasSwitch(switches::kEnableMonitorProfile);
}
return enabled;
}
void BackingStore::PaintRect(base::ProcessHandle process,
TransportDIB* bitmap,
const gfx::Rect& bitmap_rect,
const gfx::Rect& copy_rect) {
if (!backing_store_dib_) {
backing_store_dib_ = CreateDIB(hdc_, size_.width(),
size_.height(), color_depth_);
if (!backing_store_dib_) {
NOTREACHED();
return;
}
original_bitmap_ = SelectObject(hdc_, backing_store_dib_);
}
BITMAPINFOHEADER hdr;
gfx::CreateBitmapHeader(bitmap_rect.width(), bitmap_rect.height(), &hdr);
// Account for a bitmap_rect that exceeds the bounds of our view
gfx::Rect view_rect(0, 0, size_.width(), size_.height());
gfx::Rect paint_rect = view_rect.Intersect(copy_rect);
CallStretchDIBits(hdc_,
paint_rect.x(),
paint_rect.y(),
paint_rect.width(),
paint_rect.height(),
paint_rect.x() - bitmap_rect.x(),
paint_rect.y() - bitmap_rect.y(),
paint_rect.width(),
paint_rect.height(),
bitmap->memory(),
reinterpret_cast<BITMAPINFO*>(&hdr));
}
void BackingStore::ScrollRect(base::ProcessHandle process,
TransportDIB* bitmap,
const gfx::Rect& bitmap_rect,
int dx, int dy,
const gfx::Rect& clip_rect,
const gfx::Size& view_size) {
RECT damaged_rect, r = clip_rect.ToRECT();
ScrollDC(hdc_, dx, dy, NULL, &r, NULL, &damaged_rect);
// TODO(darin): this doesn't work if dx and dy are both non-zero!
DCHECK(dx == 0 || dy == 0);
// We expect that damaged_rect should equal bitmap_rect.
DCHECK(gfx::Rect(damaged_rect) == bitmap_rect);
PaintRect(process, bitmap, bitmap_rect, bitmap_rect);
}
|
