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      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                                 double 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 = static_cast<float>(1. / 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
     87