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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
// Copyright 2014 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 "components/printing/renderer/print_web_view_helper.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/process/process_handle.h"
#include "components/printing/common/print_messages.h"
#include "content/public/renderer/render_thread.h"
#include "printing/metafile_skia_wrapper.h"
#include "printing/page_size_margins.h"
#include "printing/pdf_metafile_skia.h"
#include "printing/units.h"
#include "skia/ext/platform_device.h"
#include "third_party/WebKit/public/web/WebLocalFrame.h"
namespace printing {
using blink::WebFrame;
bool PrintWebViewHelper::RenderPreviewPage(
int page_number,
const PrintMsg_Print_Params& print_params) {
PrintMsg_PrintPage_Params page_params;
page_params.params = print_params;
page_params.page_number = page_number;
scoped_ptr<PdfMetafileSkia> draft_metafile;
PdfMetafileSkia* initial_render_metafile = print_preview_context_.metafile();
if (print_preview_context_.IsModifiable() && is_print_ready_metafile_sent_) {
draft_metafile.reset(new PdfMetafileSkia);
initial_render_metafile = draft_metafile.get();
}
base::TimeTicks begin_time = base::TimeTicks::Now();
PrintPageInternal(page_params,
print_preview_context_.prepared_frame(),
initial_render_metafile,
NULL,
NULL);
print_preview_context_.RenderedPreviewPage(
base::TimeTicks::Now() - begin_time);
if (draft_metafile.get()) {
draft_metafile->FinishDocument();
} else if (print_preview_context_.IsModifiable() &&
print_preview_context_.generate_draft_pages()) {
DCHECK(!draft_metafile.get());
draft_metafile =
print_preview_context_.metafile()->GetMetafileForCurrentPage();
}
return PreviewPageRendered(page_number, draft_metafile.get());
}
bool PrintWebViewHelper::PrintPagesNative(blink::WebFrame* frame,
int page_count) {
PdfMetafileSkia metafile;
if (!metafile.Init())
return false;
const PrintMsg_PrintPages_Params& params = *print_pages_params_;
std::vector<int> printed_pages;
if (params.pages.empty()) {
for (int i = 0; i < page_count; ++i) {
printed_pages.push_back(i);
}
} else {
// TODO(vitalybuka): redesign to make more code cross platform.
for (size_t i = 0; i < params.pages.size(); ++i) {
if (params.pages[i] >= 0 && params.pages[i] < page_count) {
printed_pages.push_back(params.pages[i]);
}
}
}
if (printed_pages.empty())
return false;
std::vector<gfx::Size> page_size_in_dpi(printed_pages.size());
std::vector<gfx::Rect> content_area_in_dpi(printed_pages.size());
PrintMsg_PrintPage_Params page_params;
page_params.params = params.params;
for (size_t i = 0; i < printed_pages.size(); ++i) {
page_params.page_number = printed_pages[i];
PrintPageInternal(page_params,
frame,
&metafile,
&page_size_in_dpi[i],
&content_area_in_dpi[i]);
}
// blink::printEnd() for PDF should be called before metafile is closed.
FinishFramePrinting();
metafile.FinishDocument();
// Get the size of the resulting metafile.
uint32 buf_size = metafile.GetDataSize();
DCHECK_GT(buf_size, 0u);
PrintHostMsg_DidPrintPage_Params printed_page_params;
printed_page_params.data_size = 0;
printed_page_params.document_cookie = params.params.document_cookie;
printed_page_params.page_size = params.params.page_size;
printed_page_params.content_area = params.params.printable_area;
{
base::SharedMemory shared_buf;
// Allocate a shared memory buffer to hold the generated metafile data.
if (!shared_buf.CreateAndMapAnonymous(buf_size)) {
NOTREACHED() << "Buffer allocation failed";
return false;
}
// Copy the bits into shared memory.
if (!metafile.GetData(shared_buf.memory(), buf_size)) {
NOTREACHED() << "GetData() failed";
shared_buf.Unmap();
return false;
}
shared_buf.GiveToProcess(base::GetCurrentProcessHandle(),
&printed_page_params.metafile_data_handle);
shared_buf.Unmap();
printed_page_params.data_size = buf_size;
Send(new PrintHostMsg_DuplicateSection(
routing_id(),
printed_page_params.metafile_data_handle,
&printed_page_params.metafile_data_handle));
}
for (size_t i = 0; i < printed_pages.size(); ++i) {
printed_page_params.page_number = printed_pages[i];
printed_page_params.page_size = page_size_in_dpi[i];
printed_page_params.content_area = content_area_in_dpi[i];
Send(new PrintHostMsg_DidPrintPage(routing_id(), printed_page_params));
printed_page_params.metafile_data_handle = INVALID_HANDLE_VALUE;
}
return true;
}
void PrintWebViewHelper::PrintPageInternal(
const PrintMsg_PrintPage_Params& params,
WebFrame* frame,
PdfMetafileSkia* metafile,
gfx::Size* page_size_in_dpi,
gfx::Rect* content_area_in_dpi) {
PageSizeMargins page_layout_in_points;
double css_scale_factor = 1.0f;
ComputePageLayoutInPointsForCss(frame, params.page_number, params.params,
ignore_css_margins_, &css_scale_factor,
&page_layout_in_points);
gfx::Size page_size;
gfx::Rect content_area;
GetPageSizeAndContentAreaFromPageLayout(page_layout_in_points, &page_size,
&content_area);
int dpi = static_cast<int>(params.params.dpi);
// Calculate the actual page size and content area in dpi.
if (page_size_in_dpi) {
*page_size_in_dpi =
gfx::Size(static_cast<int>(ConvertUnitDouble(page_size.width(),
kPointsPerInch, dpi)),
static_cast<int>(ConvertUnitDouble(page_size.height(),
kPointsPerInch, dpi)));
}
if (content_area_in_dpi) {
// Output PDF matches paper size and should be printer edge to edge.
*content_area_in_dpi =
gfx::Rect(0, 0, page_size_in_dpi->width(), page_size_in_dpi->height());
}
gfx::Rect canvas_area =
params.params.display_header_footer ? gfx::Rect(page_size) : content_area;
float webkit_page_shrink_factor =
frame->getPrintPageShrink(params.page_number);
float scale_factor = css_scale_factor * webkit_page_shrink_factor;
skia::PlatformCanvas* canvas =
metafile->GetVectorCanvasForNewPage(page_size, canvas_area, scale_factor);
if (!canvas)
return;
MetafileSkiaWrapper::SetMetafileOnCanvas(*canvas, metafile);
skia::SetIsDraftMode(*canvas, is_print_ready_metafile_sent_);
#if defined(ENABLE_PRINT_PREVIEW)
if (params.params.display_header_footer) {
// |page_number| is 0-based, so 1 is added.
PrintHeaderAndFooter(canvas, params.page_number + 1,
print_preview_context_.total_page_count(), *frame,
scale_factor, page_layout_in_points, params.params);
}
#endif // defined(ENABLE_PRINT_PREVIEW)
float webkit_scale_factor =
RenderPageContent(frame, params.page_number, canvas_area, content_area,
scale_factor, canvas);
DCHECK_GT(webkit_scale_factor, 0.0f);
// Done printing. Close the canvas to retrieve the compiled metafile.
if (!metafile->FinishPage())
NOTREACHED() << "metafile failed";
}
bool PrintWebViewHelper::CopyMetafileDataToSharedMem(
PdfMetafileSkia* metafile,
base::SharedMemoryHandle* shared_mem_handle) {
uint32 buf_size = metafile->GetDataSize();
base::SharedMemory shared_buf;
// Allocate a shared memory buffer to hold the generated metafile data.
if (!shared_buf.CreateAndMapAnonymous(buf_size)) {
NOTREACHED() << "Buffer allocation failed";
return false;
}
// Copy the bits into shared memory.
if (!metafile->GetData(shared_buf.memory(), buf_size)) {
NOTREACHED() << "GetData() failed";
shared_buf.Unmap();
return false;
}
shared_buf.GiveToProcess(base::GetCurrentProcessHandle(), shared_mem_handle);
shared_buf.Unmap();
Send(new PrintHostMsg_DuplicateSection(routing_id(), *shared_mem_handle,
shared_mem_handle));
return true;
}
} // namespace printing
|
