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: 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 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 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