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// Copyright (c) 2009 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 "app/win_util.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "gfx/font.h"
#include "printing/page_number.h"
#include "printing/page_overlays.h"
#include "printing/printed_pages_source.h"
#include "printing/printed_page.h"
#include "printing/units.h"
#include "skia/ext/platform_device.h"
#if defined(OS_WIN)
namespace {
void SimpleModifyWorldTransform(HDC context,
int offset_x,
int offset_y,
double shrink_factor) {
XFORM xform = { 0 };
xform.eDx = static_cast<float>(offset_x);
xform.eDy = static_cast<float>(offset_y);
xform.eM11 = xform.eM22 = static_cast<float>(1. / shrink_factor);
BOOL res = ModifyWorldTransform(context, &xform, MWT_LEFTMULTIPLY);
DCHECK_NE(res, 0);
}
void DrawRect(HDC context, gfx::Rect rect) {
Rectangle(context, rect.x(), rect.y(), rect.right(), rect.bottom());
}
} // namespace
#endif // OS_WIN
namespace printing {
void PrintedDocument::RenderPrintedPage(
const PrintedPage& page, gfx::NativeDrawingContext context) const {
#ifndef NDEBUG
{
// Make sure the page is from our list.
AutoLock lock(lock_);
DCHECK(&page == mutable_.pages_.find(page.page_number() - 1)->second.get());
}
#endif
const printing::PageSetup& page_setup(
immutable_.settings_.page_setup_device_units());
gfx::Rect content_area(page.page_content_rect());
const gfx::Size& physical_size = page_setup.physical_size();
// http://dev.w3.org/csswg/css3-page/#positioning-page-box
if (physical_size.width() > page.page_size().width()) {
int diff = physical_size.width() - page.page_size().width();
content_area.set_x(content_area.x() + diff / 2);
}
if (physical_size.height() > page.page_size().height()) {
int diff = physical_size.height() - page.page_size().height();
content_area.set_y(content_area.y() + diff / 2);
}
// 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::PlatformDevice::InitializeDC(context);
{
// Save the state (again) to apply the necessary world transformation.
int saved_state = SaveDC(context);
DCHECK_NE(saved_state, 0);
#if 0
// Debug code to visually verify margins (leaks GDI handles).
XFORM debug_xform = { 0 };
ModifyWorldTransform(context, &debug_xform, MWT_IDENTITY);
// Printable area:
SelectObject(context, CreatePen(PS_SOLID, 1, RGB(0, 0, 0)));
SelectObject(context, CreateSolidBrush(RGB(0x90, 0x90, 0x90)));
Rectangle(context,
0,
0,
page_setup.printable_area().width(),
page_setup.printable_area().height());
// Overlay area:
gfx::Rect debug_overlay_area(page_setup.overlay_area());
debug_overlay_area.Offset(-page_setup.printable_area().x(),
-page_setup.printable_area().y());
SelectObject(context, CreateSolidBrush(RGB(0xb0, 0xb0, 0xb0)));
DrawRect(context, debug_overlay_area);
// Content area:
gfx::Rect debug_content_area(content_area());
debug_content_area.Offset(-page_setup.printable_area().x(),
-page_setup.printable_area().y());
SelectObject(context, CreateSolidBrush(RGB(0xd0, 0xd0, 0xd0)));
DrawRect(context, debug_content_area);
#endif
// 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(),
mutable_.shrink_factor);
if (!page.native_metafile()->SafePlayback(context)) {
NOTREACHED();
}
BOOL res = RestoreDC(context, saved_state);
DCHECK_NE(res, 0);
}
// Print the header and footer. Offset by printable area offset (see comment
// above).
SimpleModifyWorldTransform(
context,
-page_setup.printable_area().x(),
-page_setup.printable_area().y(),
1);
int base_font_size = gfx::Font().height();
int new_font_size = ConvertUnit(10,
immutable_.settings_.desired_dpi,
immutable_.settings_.device_units_per_inch());
DCHECK_GT(new_font_size, base_font_size);
gfx::Font font(gfx::Font().DeriveFont(new_font_size - base_font_size));
HGDIOBJ old_font = SelectObject(context, font.hfont());
DCHECK(old_font != NULL);
// We don't want a white square around the text ever if overflowing.
SetBkMode(context, TRANSPARENT);
PrintHeaderFooter(context, page, PageOverlays::LEFT, PageOverlays::TOP,
font);
PrintHeaderFooter(context, page, PageOverlays::CENTER, PageOverlays::TOP,
font);
PrintHeaderFooter(context, page, PageOverlays::RIGHT, PageOverlays::TOP,
font);
PrintHeaderFooter(context, page, PageOverlays::LEFT, PageOverlays::BOTTOM,
font);
PrintHeaderFooter(context, page, PageOverlays::CENTER, PageOverlays::BOTTOM,
font);
PrintHeaderFooter(context, page, PageOverlays::RIGHT, PageOverlays::BOTTOM,
font);
int res = RestoreDC(context, saved_state);
DCHECK_NE(res, 0);
}
} // namespace printing
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