Ichthyostega
1ed4bd2c4c
All the backbone functionality has been factored out into dedicated facilities
97 lines
3 KiB
C++
97 lines
3 KiB
C++
/*
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Displayer - base class for displaying video
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Copyright (C) Lumiera.org
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2000, Arne Schirmacher <arne@schirmacher.de>
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2001-2007, Dan Dennedy <dan@dennedy.org>
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2008, Joel Holdsworth <joel@airwebreathe.org.uk>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file displayer.cpp
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** Implementation of a displayer object, intended for creating
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** a video display in the UI. This class was created as part of
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** an initial draft of the user interface.
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** @warning as of 2016 it is not clear, if this code will be
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** evolved into the actual display facility, or be
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** replaced and rewritten, when we're about to
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** create a functional video display connected
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** to the render engine.
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*/
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#include "gui/gtk-base.hpp"
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#include "gui/output/displayer.hpp"
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#include "gui/output/xvdisplayer.hpp"
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#include "gui/output/gdkdisplayer.hpp"
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namespace gui {
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namespace output {
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bool
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Displayer::usable()
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{
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return false;
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}
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DisplayerInput
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Displayer::format()
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{
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return DISPLAY_NONE;
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}
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int
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Displayer::preferredWidth()
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{
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return imageWidth;
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}
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int
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Displayer::preferredHeight()
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{
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return imageHeight;
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}
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void
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Displayer::calculateVideoLayout(
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int widget_width, int widget_height,
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int image_width, int image_height,
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int &video_x, int &video_y, int &video_width, int &video_height )
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{
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REQUIRE (widget_width >= 0);
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REQUIRE (widget_height >= 0);
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REQUIRE (image_width >= 0);
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REQUIRE (image_height >= 0);
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double ratio_width = ( double ) widget_width / ( double ) image_width;
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double ratio_height = ( double ) widget_height / ( double ) image_height;
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double ratio_constant = ratio_height < ratio_width ?
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ratio_height : ratio_width;
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video_width = ( int ) ( image_width * ratio_constant + 0.5 );
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video_height = ( int ) ( image_height * ratio_constant + 0.5 );
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video_x = ( widget_width - video_width ) / 2;
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video_y = ( widget_height - video_height ) / 2;
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ENSURE (video_x >= 0 && video_x < widget_width);
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ENSURE (video_y >= 0 && video_y < widget_height);
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ENSURE (video_width <= widget_width);
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ENSURE (video_width <= widget_width);
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}
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}} // namespace gui::output
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