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// Copyright (c) 2011 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.
#include "printing/printed_document.h"
#include "base/logging.h"
#include "printing/page_number.h"
#include "printing/printed_pages_source.h"
#include "printing/printed_page.h"
#include "printing/units.h"
#include "skia/ext/skia_utils_win.h"
namespace {
void SimpleModifyWorldTransform(HDC context,
int offset_x,
int offset_y,
float shrink_factor) {
XFORM xform = { 0 };
xform.eDx = static_cast<float>(offset_x);
xform.eDy = static_cast<float>(offset_y);
xform.eM11 = xform.eM22 = 1.f / shrink_factor;
BOOL res = ModifyWorldTransform(context, &xform, MWT_LEFTMULTIPLY);
DCHECK_NE(res, 0);
}
} // namespace
namespace printing {
void PrintedDocument::RenderPrintedPage(
const PrintedPage& page, gfx::NativeDrawingContext context) const {
#ifndef NDEBUG
{
// Make sure the page is from our list.
base::AutoLock lock(lock_);
DCHECK(&page == mutable_.pages_.find(page.page_number() - 1)->second.get());
}
#endif
DCHECK(context);
const PageSetup& page_setup(immutable_.settings_.page_setup_device_units());
gfx::Rect content_area;
page.GetCenteredPageContentRect(page_setup.physical_size(), &content_area);
// Save the state to make sure the context this function call does not modify
// the device context.
int saved_state = SaveDC(context);
DCHECK_NE(saved_state, 0);
skia::InitializeDC(context);
{
// Save the state (again) to apply the necessary world transformation.
int saved_state = SaveDC(context);
DCHECK_NE(saved_state, 0);
// Setup the matrix to translate and scale to the right place. Take in
// account the actual shrinking factor.
// Note that the printing output is relative to printable area of the page.
// That is 0,0 is offset by PHYSICALOFFSETX/Y from the page.
SimpleModifyWorldTransform(
context,
content_area.x() - page_setup.printable_area().x(),
content_area.y() - page_setup.printable_area().y(),
page.shrink_factor());
::StartPage(context);
if (!page.metafile()->SafePlayback(context)) {
NOTREACHED();
}
::EndPage(context);
BOOL res = RestoreDC(context, saved_state);
DCHECK_NE(res, 0);
}
int res = RestoreDC(context, saved_state);
DCHECK_NE(res, 0);
}
} // namespace printing
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