printing/printed_document_win.cc

   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/printed_document.h"
   6
   7 #include "base/logging.h"
   8 #include "printing/page_number.h"
   9 #include "printing/printed_pages_source.h"
  10 #include "printing/printed_page.h"
  11 #include "printing/units.h"
  12 #include "skia/ext/platform_device.h"
  13
  14 namespace {
  15
  16 void SimpleModifyWorldTransform(HDC context,
  17                                 int offset_x,
  18                                 int offset_y,
  19                                 float shrink_factor) {
  20   XFORM xform = { 0 };
  21   xform.eDx = static_cast<float>(offset_x);
  22   xform.eDy = static_cast<float>(offset_y);
  23   xform.eM11 = xform.eM22 = 1.f / shrink_factor;
  24   BOOL res = ModifyWorldTransform(context, &xform, MWT_LEFTMULTIPLY);
  25   DCHECK_NE(res, 0);
  26 }
  27
  28 void DrawRect(HDC context, gfx::Rect rect) {
  29   Rectangle(context, rect.x(), rect.y(), rect.right(), rect.bottom());
  30 }
  31
  32 }  // namespace
  33
  34 namespace printing {
  35
  36 void PrintedDocument::RenderPrintedPage(
  37     const PrintedPage& page, gfx::NativeDrawingContext context) const {
  38 #ifndef NDEBUG
  39   {
  40     // Make sure the page is from our list.
  41     base::AutoLock lock(lock_);
  42     DCHECK(&page == mutable_.pages_.find(page.page_number() - 1)->second.get());
  43   }
  44 #endif
  45
  46   DCHECK(context);
  47
  48   const PageSetup& page_setup(immutable_.settings_.page_setup_device_units());
  49   gfx::Rect content_area;
  50   page.GetCenteredPageContentRect(page_setup.physical_size(), &content_area);
  51
  52   // Save the state to make sure the context this function call does not modify
  53   // the device context.
  54   int saved_state = SaveDC(context);
  55   DCHECK_NE(saved_state, 0);
  56   skia::InitializeDC(context);
  57   {
  58     // Save the state (again) to apply the necessary world transformation.
  59     int saved_state = SaveDC(context);
  60     DCHECK_NE(saved_state, 0);
  61
  62     // Setup the matrix to translate and scale to the right place. Take in
  63     // account the actual shrinking factor.
  64     // Note that the printing output is relative to printable area of the page.
  65     // That is 0,0 is offset by PHYSICALOFFSETX/Y from the page.
  66     SimpleModifyWorldTransform(
  67         context,
  68         content_area.x() - page_setup.printable_area().x(),
  69         content_area.y() - page_setup.printable_area().y(),
  70         page.shrink_factor());
  71
  72     ::StartPage(context);
  73     if (!page.metafile()->SafePlayback(context)) {
  74       NOTREACHED();
  75     }
  76     ::EndPage(context);
  77
  78     BOOL res = RestoreDC(context, saved_state);
  79     DCHECK_NE(res, 0);
  80   }
  81
  82   int res = RestoreDC(context, saved_state);
  83   DCHECK_NE(res, 0);
  84 }
  85
  86 }  // namespace printing