printing/page_setup.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/page_setup.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/logging.h"
  10
  11 namespace printing {
  12
  13 PageMargins::PageMargins()
  14     : header(0),
  15       footer(0),
  16       left(0),
  17       right(0),
  18       top(0),
  19       bottom(0) {
  20 }
  21
  22 void PageMargins::Clear() {
  23   header = 0;
  24   footer = 0;
  25   left = 0;
  26   right = 0;
  27   top = 0;
  28   bottom = 0;
  29 }
  30
  31 bool PageMargins::Equals(const PageMargins& rhs) const {
  32   return header == rhs.header &&
  33       footer == rhs.footer &&
  34       left == rhs.left &&
  35       top == rhs.top &&
  36       right == rhs.right &&
  37       bottom == rhs.bottom;
  38 }
  39
  40 PageSetup::PageSetup() {
  41   Clear();
  42 }
  43
  44 PageSetup::~PageSetup() {}
  45
  46 void PageSetup::Clear() {
  47   physical_size_.SetSize(0, 0);
  48   printable_area_.SetRect(0, 0, 0, 0);
  49   overlay_area_.SetRect(0, 0, 0, 0);
  50   content_area_.SetRect(0, 0, 0, 0);
  51   effective_margins_.Clear();
  52   text_height_ = 0;
  53   forced_margins_ = false;
  54 }
  55
  56 bool PageSetup::Equals(const PageSetup& rhs) const {
  57   return physical_size_ == rhs.physical_size_ &&
  58       printable_area_ == rhs.printable_area_ &&
  59       overlay_area_ == rhs.overlay_area_ &&
  60       content_area_ == rhs.content_area_ &&
  61       effective_margins_.Equals(rhs.effective_margins_) &&
  62       requested_margins_.Equals(rhs.requested_margins_) &&
  63       text_height_ == rhs.text_height_;
  64 }
  65
  66 void PageSetup::Init(const gfx::Size& physical_size,
  67                      const gfx::Rect& printable_area,
  68                      int text_height) {
  69   DCHECK_LE(printable_area.right(), physical_size.width());
  70   // I've seen this assert triggers on Canon GP160PF PCL 5e and HP LaserJet 5.
  71   // Since we don't know the dpi here, just disable the check.
  72   // DCHECK_LE(printable_area.bottom(), physical_size.height());
  73   DCHECK_GE(printable_area.x(), 0);
  74   DCHECK_GE(printable_area.y(), 0);
  75   DCHECK_GE(text_height, 0);
  76   physical_size_ = physical_size;
  77   printable_area_ = printable_area;
  78   text_height_ = text_height;
  79
  80   SetRequestedMarginsAndCalculateSizes(requested_margins_);
  81 }
  82
  83 void PageSetup::SetRequestedMargins(const PageMargins& requested_margins) {
  84   forced_margins_ = false;
  85   SetRequestedMarginsAndCalculateSizes(requested_margins);
  86 }
  87
  88 void PageSetup::ForceRequestedMargins(const PageMargins& requested_margins) {
  89   forced_margins_ = true;
  90   SetRequestedMarginsAndCalculateSizes(requested_margins);
  91 }
  92
  93 void PageSetup::FlipOrientation() {
  94   if (physical_size_.width() && physical_size_.height()) {
  95     gfx::Size new_size(physical_size_.height(), physical_size_.width());
  96     int new_y = physical_size_.width() -
  97                 (printable_area_.width() + printable_area_.x());
  98     gfx::Rect new_printable_area(printable_area_.y(),
  99                                  new_y,
 100                                  printable_area_.height(),
 101                                  printable_area_.width());
 102     Init(new_size, new_printable_area, text_height_);
 103   }
 104 }
 105
 106 void PageSetup::SetRequestedMarginsAndCalculateSizes(
 107     const PageMargins& requested_margins) {
 108   requested_margins_ = requested_margins;
 109   if (physical_size_.width() && physical_size_.height()) {
 110     if (forced_margins_)
 111       CalculateSizesWithinRect(gfx::Rect(physical_size_), 0);
 112     else
 113       CalculateSizesWithinRect(printable_area_, text_height_);
 114   }
 115 }
 116
 117 void PageSetup::CalculateSizesWithinRect(const gfx::Rect& bounds,
 118                                          int text_height) {
 119   // Calculate the effective margins. The tricky part.
 120   effective_margins_.header = std::max(requested_margins_.header,
 121                                        bounds.y());
 122   effective_margins_.footer = std::max(requested_margins_.footer,
 123                                        physical_size_.height() -
 124                                            bounds.bottom());
 125   effective_margins_.left = std::max(requested_margins_.left,
 126                                      bounds.x());
 127   effective_margins_.top = std::max(std::max(requested_margins_.top,
 128                                              bounds.y()),
 129                                     effective_margins_.header + text_height);
 130   effective_margins_.right = std::max(requested_margins_.right,
 131                                       physical_size_.width() -
 132                                           bounds.right());
 133   effective_margins_.bottom =
 134       std::max(std::max(requested_margins_.bottom,
 135                         physical_size_.height() - bounds.bottom()),
 136                effective_margins_.footer + text_height);
 137
 138   // Calculate the overlay area. If the margins are excessive, the overlay_area
 139   // size will be (0, 0).
 140   overlay_area_.set_x(effective_margins_.left);
 141   overlay_area_.set_y(effective_margins_.header);
 142   overlay_area_.set_width(std::max(0,
 143                                    physical_size_.width() -
 144                                        effective_margins_.right -
 145                                        overlay_area_.x()));
 146   overlay_area_.set_height(std::max(0,
 147                                     physical_size_.height() -
 148                                         effective_margins_.footer -
 149                                         overlay_area_.y()));
 150
 151   // Calculate the content area. If the margins are excessive, the content_area
 152   // size will be (0, 0).
 153   content_area_.set_x(effective_margins_.left);
 154   content_area_.set_y(effective_margins_.top);
 155   content_area_.set_width(std::max(0,
 156                                    physical_size_.width() -
 157                                        effective_margins_.right -
 158                                        content_area_.x()));
 159   content_area_.set_height(std::max(0,
 160                                     physical_size_.height() -
 161                                         effective_margins_.bottom -
 162                                         content_area_.y()));
 163 }
 164
 165 }  // namespace printing