1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "printing/image.h"
6
7 #include "base/win/scoped_gdi_object.h"
8 #include "base/win/scoped_hdc.h"
9 #include "base/win/scoped_select_object.h"
10 #include "printing/metafile.h"
11 #include "skia/ext/platform_device.h"
12 #include "ui/gfx/gdi_util.h" // EMF support
13 #include "ui/gfx/rect.h"
14
15
16 namespace {
17
18 // A simple class which temporarily overrides system settings.
19 // The bitmap image rendered via the PlayEnhMetaFile() function depends on
20 // some system settings.
21 // As a workaround for such dependency, this class saves the system settings
22 // and changes them. This class also restore the saved settings in its
23 // destructor.
24 class DisableFontSmoothing {
25 public:
DisableFontSmoothing()26 explicit DisableFontSmoothing() : enable_again_(false) {
27 BOOL enabled;
28 if (SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &enabled, 0) &&
29 enabled) {
30 if (SystemParametersInfo(SPI_SETFONTSMOOTHING, FALSE, NULL, 0))
31 enable_again_ = true;
32 }
33 }
34
~DisableFontSmoothing()35 ~DisableFontSmoothing() {
36 if (enable_again_) {
37 BOOL result = SystemParametersInfo(SPI_SETFONTSMOOTHING, TRUE, NULL, 0);
38 DCHECK(result);
39 }
40 }
41
42 private:
43 bool enable_again_;
44
45 DISALLOW_COPY_AND_ASSIGN(DisableFontSmoothing);
46 };
47
48 } // namespace
49
50 namespace printing {
51
LoadMetafile(const Metafile & metafile)52 bool Image::LoadMetafile(const Metafile& metafile) {
53 gfx::Rect rect(metafile.GetPageBounds(1));
54 DisableFontSmoothing disable_in_this_scope;
55
56 // Create a temporary HDC and bitmap to retrieve the rendered data.
57 base::win::ScopedCreateDC hdc(::CreateCompatibleDC(NULL));
58 BITMAPV4HEADER hdr;
59 DCHECK_EQ(rect.x(), 0);
60 DCHECK_EQ(rect.y(), 0);
61 DCHECK_GE(rect.width(), 0); // Metafile could be empty.
62 DCHECK_GE(rect.height(), 0);
63
64 if (rect.width() < 1 || rect.height() < 1)
65 return false;
66
67 size_ = rect.size();
68 gfx::CreateBitmapV4Header(rect.width(), rect.height(), &hdr);
69 unsigned char* bits = NULL;
70 base::win::ScopedBitmap bitmap(
71 ::CreateDIBSection(hdc, reinterpret_cast<BITMAPINFO*>(&hdr), 0,
72 reinterpret_cast<void**>(&bits), NULL, 0));
73 DCHECK(bitmap);
74 base::win::ScopedSelectObject select_object(hdc, bitmap);
75
76 skia::InitializeDC(hdc);
77
78 bool success = metafile.Playback(hdc, NULL);
79
80 row_length_ = size_.width() * sizeof(uint32);
81 size_t bytes = row_length_ * size_.height();
82 DCHECK(bytes);
83
84 data_.assign(bits, bits + bytes);
85
86 return success;
87 }
88
89 } // namespace printing
90