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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/page_setup.h"
- #include <algorithm>
- #include "base/check_op.h"
- namespace printing {
- namespace {
- // Checks whether `printable_area` can be used to form a valid symmetrical
- // printable area, so that margin_left equals margin_right, and margin_top
- // equals margin_bottom. For example if
- // printable_area.x() * 2 >= page_size.width(), then the
- // content_width = page_size.width() - 2 * printable_area.x() would be zero or
- // negative, which is invalid.
- // `page_size` is the physical page size that includes margins.
- bool IsValidPrintableArea(const gfx::Size& page_size,
- const gfx::Rect& printable_area) {
- return !printable_area.IsEmpty() && printable_area.x() >= 0 &&
- printable_area.y() >= 0 &&
- printable_area.right() <= page_size.width() &&
- printable_area.bottom() <= page_size.height() &&
- printable_area.x() * 2 < page_size.width() &&
- printable_area.y() * 2 < page_size.height() &&
- printable_area.right() * 2 > page_size.width() &&
- printable_area.bottom() * 2 > page_size.height();
- }
- } // namespace
- PageMargins::PageMargins()
- : header(0), footer(0), left(0), right(0), top(0), bottom(0) {}
- PageMargins::PageMargins(int header,
- int footer,
- int left,
- int right,
- int top,
- int bottom)
- : header(header),
- footer(footer),
- left(left),
- right(right),
- top(top),
- bottom(bottom) {}
- void PageMargins::Clear() {
- header = 0;
- footer = 0;
- left = 0;
- right = 0;
- top = 0;
- bottom = 0;
- }
- bool PageMargins::Equals(const PageMargins& rhs) const {
- return header == rhs.header && footer == rhs.footer && left == rhs.left &&
- top == rhs.top && right == rhs.right && bottom == rhs.bottom;
- }
- PageSetup::PageSetup() {
- Clear();
- }
- PageSetup::PageSetup(const gfx::Size& physical_size,
- const gfx::Rect& printable_area,
- const PageMargins& requested_margins,
- bool forced_margins,
- int text_height)
- : requested_margins_(requested_margins), forced_margins_(forced_margins) {
- Init(physical_size, printable_area, text_height);
- }
- PageSetup::PageSetup(const PageSetup& other) = default;
- PageSetup::~PageSetup() = default;
- // static
- gfx::Rect PageSetup::GetSymmetricalPrintableArea(
- const gfx::Size& page_size,
- const gfx::Rect& printable_area) {
- if (!IsValidPrintableArea(page_size, printable_area))
- return gfx::Rect();
- int left_right_margin =
- std::max(printable_area.x(), page_size.width() - printable_area.right());
- int top_bottom_margin = std::max(
- printable_area.y(), page_size.height() - printable_area.bottom());
- int width = page_size.width() - 2 * left_right_margin;
- int height = page_size.height() - 2 * top_bottom_margin;
- gfx::Rect symmetrical_printable_area = gfx::Rect(page_size);
- symmetrical_printable_area.ClampToCenteredSize(gfx::Size(width, height));
- return symmetrical_printable_area;
- }
- void PageSetup::Clear() {
- physical_size_.SetSize(0, 0);
- printable_area_.SetRect(0, 0, 0, 0);
- overlay_area_.SetRect(0, 0, 0, 0);
- content_area_.SetRect(0, 0, 0, 0);
- effective_margins_.Clear();
- text_height_ = 0;
- forced_margins_ = false;
- }
- bool PageSetup::Equals(const PageSetup& rhs) const {
- return physical_size_ == rhs.physical_size_ &&
- printable_area_ == rhs.printable_area_ &&
- overlay_area_ == rhs.overlay_area_ &&
- content_area_ == rhs.content_area_ &&
- effective_margins_.Equals(rhs.effective_margins_) &&
- requested_margins_.Equals(rhs.requested_margins_) &&
- text_height_ == rhs.text_height_;
- }
- void PageSetup::Init(const gfx::Size& physical_size,
- const gfx::Rect& printable_area,
- int text_height) {
- DCHECK_LE(printable_area.right(), physical_size.width());
- // I've seen this assert triggers on Canon GP160PF PCL 5e and HP LaserJet 5.
- // Since we don't know the dpi here, just disable the check.
- // DCHECK_LE(printable_area.bottom(), physical_size.height());
- DCHECK_GE(printable_area.x(), 0);
- DCHECK_GE(printable_area.y(), 0);
- DCHECK_GE(text_height, 0);
- physical_size_ = physical_size;
- printable_area_ = printable_area;
- text_height_ = text_height;
- SetRequestedMarginsAndCalculateSizes(requested_margins_);
- }
- void PageSetup::SetRequestedMargins(const PageMargins& requested_margins) {
- forced_margins_ = false;
- SetRequestedMarginsAndCalculateSizes(requested_margins);
- }
- void PageSetup::ForceRequestedMargins(const PageMargins& requested_margins) {
- forced_margins_ = true;
- SetRequestedMarginsAndCalculateSizes(requested_margins);
- }
- void PageSetup::FlipOrientation() {
- if (physical_size_.width() && physical_size_.height()) {
- gfx::Size new_size(physical_size_.height(), physical_size_.width());
- int new_y = physical_size_.width() -
- (printable_area_.width() + printable_area_.x());
- gfx::Rect new_printable_area(printable_area_.y(), new_y,
- printable_area_.height(),
- printable_area_.width());
- Init(new_size, new_printable_area, text_height_);
- }
- }
- void PageSetup::SetRequestedMarginsAndCalculateSizes(
- const PageMargins& requested_margins) {
- requested_margins_ = requested_margins;
- if (physical_size_.width() && physical_size_.height()) {
- if (forced_margins_)
- CalculateSizesWithinRect(gfx::Rect(physical_size_), 0);
- else
- CalculateSizesWithinRect(printable_area_, text_height_);
- }
- }
- void PageSetup::CalculateSizesWithinRect(const gfx::Rect& bounds,
- int text_height) {
- // Calculate the effective margins. The tricky part.
- effective_margins_.header = std::max(requested_margins_.header, bounds.y());
- effective_margins_.footer = std::max(
- requested_margins_.footer, physical_size_.height() - bounds.bottom());
- effective_margins_.left = std::max(requested_margins_.left, bounds.x());
- effective_margins_.top = std::max({requested_margins_.top, bounds.y(),
- effective_margins_.header + text_height});
- effective_margins_.right = std::max(requested_margins_.right,
- physical_size_.width() - bounds.right());
- effective_margins_.bottom = std::max(
- {requested_margins_.bottom, physical_size_.height() - bounds.bottom(),
- effective_margins_.footer + text_height});
- // Calculate the overlay area. If the margins are excessive, the overlay_area
- // size will be (0, 0).
- overlay_area_.set_x(effective_margins_.left);
- overlay_area_.set_y(effective_margins_.header);
- overlay_area_.set_width(std::max(
- 0,
- physical_size_.width() - effective_margins_.right - overlay_area_.x()));
- overlay_area_.set_height(std::max(
- 0,
- physical_size_.height() - effective_margins_.footer - overlay_area_.y()));
- // Calculate the content area. If the margins are excessive, the content_area
- // size will be (0, 0).
- content_area_.set_x(effective_margins_.left);
- content_area_.set_y(effective_margins_.top);
- content_area_.set_width(std::max(
- 0,
- physical_size_.width() - effective_margins_.right - content_area_.x()));
- content_area_.set_height(std::max(
- 0,
- physical_size_.height() - effective_margins_.bottom - content_area_.y()));
- }
- } // namespace printing
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