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
|
// 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/renderer/print_web_view_helper.h"
#include "base/file_descriptor_posix.h"
#include "base/logging.h"
#include "chrome/common/render_messages.h"
#include "chrome/common/render_messages_params.h"
#include "printing/native_metafile.h"
#include "skia/ext/vector_canvas.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebSize.h"
using printing::NativeMetafile;
using WebKit::WebFrame;
using WebKit::WebNode;
using WebKit::WebSize;
void PrintWebViewHelper::PrintPages(const ViewMsg_PrintPages_Params& params,
WebFrame* frame,
WebNode* node) {
// We only can use PDF in the renderer because Cairo needs to create a
// temporary file for a PostScript surface.
printing::NativeMetafile metafile(printing::NativeMetafile::PDF);
int page_count;
skia::VectorCanvas* canvas = NULL;
{
// Hack - when |prep_frame_view| goes out of scope, PrintEnd() gets called.
// Doing this before closing |metafile| below ensures
// webkit::ppapi::PluginInstance::PrintEnd() has a valid canvas/metafile to
// save the final output to. See pepper_plugin_instance.cc for the whole
// story.
PrepareFrameAndViewForPrint prep_frame_view(params.params,
frame,
node,
frame->view());
page_count = prep_frame_view.GetExpectedPageCount();
// TODO(myhuang): Send ViewHostMsg_DidGetPrintedPagesCount.
if (page_count == 0)
return;
metafile.Init();
ViewMsg_PrintPage_Params print_page_params;
print_page_params.params = params.params;
const gfx::Size& canvas_size = prep_frame_view.GetPrintCanvasSize();
if (params.pages.empty()) {
for (int i = 0; i < page_count; ++i) {
print_page_params.page_number = i;
delete canvas;
PrintPage(print_page_params, canvas_size, frame, &metafile, &canvas);
}
} else {
for (size_t i = 0; i < params.pages.size(); ++i) {
print_page_params.page_number = params.pages[i];
delete canvas;
PrintPage(print_page_params, canvas_size, frame, &metafile, &canvas);
}
}
}
delete canvas;
metafile.Close();
int sequence_number = -1;
// Get the size of the resulting metafile.
uint32 buf_size = metafile.GetDataSize();
DCHECK_GT(buf_size, 0u);
base::FileDescriptor fd;
// Ask the browser to open a file for us.
if (!Send(new ViewHostMsg_AllocateTempFileForPrinting(&fd,
&sequence_number))) {
return;
}
if (!metafile.SaveTo(fd))
return;
// Tell the browser we've finished writing the file.
Send(new ViewHostMsg_TempFileForPrintingWritten(sequence_number));
}
void PrintWebViewHelper::PrintPage(const ViewMsg_PrintPage_Params& params,
const gfx::Size& canvas_size,
WebFrame* frame,
printing::NativeMetafile* metafile,
skia::VectorCanvas** canvas) {
double content_width_in_points;
double content_height_in_points;
double margin_top_in_points;
double margin_right_in_points;
double margin_bottom_in_points;
double margin_left_in_points;
GetPageSizeAndMarginsInPoints(frame,
params.page_number,
params.params,
&content_width_in_points,
&content_height_in_points,
&margin_top_in_points,
&margin_right_in_points,
&margin_bottom_in_points,
&margin_left_in_points);
cairo_t* cairo_context =
metafile->StartPage(content_width_in_points,
content_height_in_points,
margin_top_in_points,
margin_right_in_points,
margin_bottom_in_points,
margin_left_in_points);
if (!cairo_context)
return;
*canvas = new skia::VectorCanvas(cairo_context,
canvas_size.width(),
canvas_size.height());
frame->printPage(params.page_number, *canvas);
// TODO(myhuang): We should handle transformation for paper margins.
// TODO(myhuang): We should render the header and the footer.
// Done printing. Close the device context to retrieve the compiled metafile.
if (!metafile->FinishPage())
NOTREACHED() << "metafile failed";
}
|
