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
|
// Copyright (c) 2012 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.
#ifndef PRINTING_METAFILE_H_
#define PRINTING_METAFILE_H_
#include <stdint.h>
#include <vector>
#include "base/macros.h"
#include "build/build_config.h"
#include "printing/printing_export.h"
#include "ui/gfx/native_widget_types.h"
#if defined(OS_WIN)
#include <windows.h>
#elif defined(OS_MACOSX)
#include <ApplicationServices/ApplicationServices.h>
#include <CoreFoundation/CoreFoundation.h>
#include "base/mac/scoped_cftyperef.h"
#endif
namespace base {
class File;
}
namespace gfx {
class Rect;
class Size;
}
namespace printing {
// This class plays metafiles from data stream (usually PDF or EMF).
class PRINTING_EXPORT MetafilePlayer {
public:
#if defined(OS_MACOSX)
// |shrink_to_fit| specifies whether the output should be shrunk to fit a
// destination page if the source PDF is bigger than the destination page in
// any dimension. If this is false, parts of the source PDF page that lie
// outside the bounds will be clipped.
// |stretch_to_fit| specifies whether the output should be stretched to fit
// the destination page if the source page size is smaller in all dimensions.
// |center_horizontally| specifies whether the output (after any scaling is
// done) should be centered horizontally within the destination page.
// |center_vertically| specifies whether the output (after any scaling is
// done) should be centered vertically within the destination page.
// Note that all scaling preserves the original aspect ratio of the page.
// |autorotate| specifies whether the source PDF should be autorotated to fit
// on the destination page.
struct MacRenderPageParams {
MacRenderPageParams()
: shrink_to_fit(false),
stretch_to_fit(false),
center_horizontally(false),
center_vertically(false),
autorotate(false) {
}
bool shrink_to_fit;
bool stretch_to_fit;
bool center_horizontally;
bool center_vertically;
bool autorotate;
};
#endif // defined(OS_MACOSX)
MetafilePlayer();
virtual ~MetafilePlayer();
#if defined(OS_WIN)
// The slow version of Playback(). It enumerates all the records and play them
// back in the HDC. The trick is that it skip over the records known to have
// issue with some printers. See Emf::Record::SafePlayback implementation for
// details.
virtual bool SafePlayback(gfx::NativeDrawingContext hdc) const = 0;
#elif defined(OS_MACOSX)
// Renders the given page into |rect| in the given context.
// Pages use a 1-based index. The rendering uses the arguments in
// |params| to determine scaling, translation, and rotation.
virtual bool RenderPage(unsigned int page_number,
gfx::NativeDrawingContext context,
const CGRect rect,
const MacRenderPageParams& params) const = 0;
#endif // if defined(OS_WIN)
// Saves the underlying data to the given file. This function should ONLY be
// called after the metafile is closed. Returns true if writing succeeded.
virtual bool SaveTo(base::File* file) const = 0;
private:
DISALLOW_COPY_AND_ASSIGN(MetafilePlayer);
};
// This class creates a graphics context that renders into a data stream
// (usually PDF or EMF).
class PRINTING_EXPORT Metafile : public MetafilePlayer {
public:
Metafile();
~Metafile() override;
// Initializes a fresh new metafile for rendering. Returns false on failure.
// Note: It should only be called from within the renderer process to allocate
// rendering resources.
virtual bool Init() = 0;
// Initializes the metafile with the data in |src_buffer|. Returns true
// on success.
// Note: It should only be called from within the browser process.
virtual bool InitFromData(const void* src_buffer,
uint32_t src_buffer_size) = 0;
// Prepares a context for rendering a new page with the given |page_size|,
// |content_area| and a |scale_factor| to use for the drawing. The units are
// in points (=1/72 in). Returns true on success.
virtual bool StartPage(const gfx::Size& page_size,
const gfx::Rect& content_area,
const float& scale_factor) = 0;
// Closes the current page and destroys the context used in rendering that
// page. The results of current page will be appended into the underlying
// data stream. Returns true on success.
virtual bool FinishPage() = 0;
// Closes the metafile. No further rendering is allowed (the current page
// is implicitly closed).
virtual bool FinishDocument() = 0;
// Returns the size of the underlying data stream. Only valid after Close()
// has been called.
virtual uint32_t GetDataSize() const = 0;
// Copies the first |dst_buffer_size| bytes of the underlying data stream into
// |dst_buffer|. This function should ONLY be called after Close() is invoked.
// Returns true if the copy succeeds.
virtual bool GetData(void* dst_buffer, uint32_t dst_buffer_size) const = 0;
virtual gfx::Rect GetPageBounds(unsigned int page_number) const = 0;
virtual unsigned int GetPageCount() const = 0;
virtual gfx::NativeDrawingContext context() const = 0;
#if defined(OS_WIN)
// "Plays" the EMF buffer in a HDC. It is the same effect as calling the
// original GDI function that were called when recording the EMF. |rect| is in
// "logical units" and is optional. If |rect| is NULL, the natural EMF bounds
// are used.
// Note: Windows has been known to have stack buffer overflow in its GDI
// functions, whether used directly or indirectly through precompiled EMF
// data. We have to accept the risk here. Since it is used only for printing,
// it requires user intervention.
virtual bool Playback(gfx::NativeDrawingContext hdc,
const RECT* rect) const = 0;
#endif // OS_WIN
bool GetDataAsVector(std::vector<char>* buffer) const;
bool SaveTo(base::File* file) const override;
private:
DISALLOW_COPY_AND_ASSIGN(Metafile);
};
} // namespace printing
#endif // PRINTING_METAFILE_H_
|
