// 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 #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