src/noarch/CanvasInput.cpp (3534d9a) - Blinker · BlinkenArea

CanvasInput.cpp

/* Blinker
   Copyright 2011 Stefan Schuermans <stefan@blinkenarea.org>
   Copyleft GNU public license - http://www.gnu.org/copyleft/gpl.html
   a blinkenarea.org project */

#include <string>

#include <BlinkenLib/BlinkenFrame.h>

#include "Canvas.h"
#include "CanvasInput.h"
#include "Directory.h"
#include "File.h"
#include "Position.h"
#include "SettingFile.h"
#include "Size.h"
#include "StreamMgr.h"
#include "StreamRecv.h"

namespace Blinker {

/**
 * @brief constructor
 * @param[in] canvas owning canvas
 * @param[in] dirBase base directory
 */
Canvas::Input::Input(Canvas &canvas, const Directory &dirBase):
  m_canvas(canvas),
  m_fileInStream(dirBase.getFile("instream")),
  m_fileSrcPos(dirBase.getFile("srcpos")),
  m_fileSize(dirBase.getFile("size")),
  m_fileDestPos(dirBase.getFile("destpos")),
  m_pInStream(NULL),
  m_haveSrcPos(false),
  m_haveSize(false),
  m_haveDestPos(false)
{
  // get settings and attach to input stream
  getSrcPos();
  getSize();
  getDestPos();
  getInStream();
}

/// virtual destructor
Canvas::Input::~Input()
{
  // detach from input stream and release it
  releaseInStream();
}

/// check for update of configuration
void Canvas::Input::updateConfig()
{
  // input stream name file was modified -> re-get input stream
  if (m_fileInStream.checkModified()) {
    releaseInStream();
    getInStream();
  }

// position/size files were modified -> re-get position/size
  if (m_fileSrcPos.checkModified())
    getSrcPos();
  if (m_fileSize.checkModified())
    getSize();
  if (m_fileDestPos.checkModified())
    getDestPos();
}

/**
 * @brief set current frame
 * @param[in] stream stream name
 * @param[in] pFrame current frame (NULL for none)
 */
void Canvas::Input::setFrame(const std::string &stream, stBlinkenFrame *pFrame)
{
  // notify canvas to redraw
  m_canvas.redraw();

(void)pFrame; // unused (frame fetched from stream when requested to draw)
  (void)stream; // unused
}

/**
 * @brief draw current frame to canvas
 * @return if a frame was available and it was drawn
 */
bool Canvas::Input::draw()
{
  stBlinkenFrame *pFrame;

// no destination position or no canvas -> leave
  if (!m_haveDestPos || !m_canvas.m_pCanvas)
    return false;

// get current frame from stream (leave if no stream or no frame)
  if (!m_pInStream)
    return false;
  pFrame = m_pInStream->getCurFrame();
  if (!pFrame)
    return false;

// no source position -> use top left
  if (!m_haveSrcPos) {
    m_srcPos.m_x = 0;
    m_srcPos.m_y = 0;
  }

// no size -> use entire source frame
  //            (BlinkenLib will clip this if too large)
  if (!m_haveSize) {
    m_size.m_width = BlinkenFrameGetWidth(pFrame);
    m_size.m_height = BlinkenFrameGetHeight(pFrame);
  }

// draw rectangular area to canvas
  BlinkenFrameCopyRect(m_canvas.m_pCanvas, m_destPos.m_y, m_destPos.m_x,
                       pFrame, m_srcPos.m_y, m_srcPos.m_x,
                       m_size.m_height, m_size.m_width);

return true;
}

/// get input stream and attach to it
void Canvas::Input::getInStream()
{
  // get input stream
  m_fileInStream.getStr(m_nameInStream);
  m_pInStream = &m_canvas.m_streamMgr.refStream(m_nameInStream);

// attach to input stream
  if (m_pInStream)
    m_pInStream->attach(this);

// redrawing canvas will happen automatically because stream will set frame
}

/// detach from input stream and release it
void Canvas::Input::releaseInStream()
{
  // detach from input stream
  if (m_pInStream)
    m_pInStream->detach(this);

// unreference stream
  m_pInStream = NULL;
  m_canvas.m_streamMgr.unrefStream(m_nameInStream);

// notify canvas to redraw
  m_canvas.redraw();
}

/// (re-)get position of area to copy from stream
void Canvas::Input::getSrcPos()
{
  std::string strPos;

// read source position from file and parse it
  m_haveSrcPos = m_fileSrcPos.getStr(strPos) && m_srcPos.fromStr(strPos);

// notify canvas to redraw
  m_canvas.redraw();
}

/// (re-)get size of area to copy from stream
void Canvas::Input::getSize()
{
  std::string strSize;

// read size from file and parse it
  m_haveSize = m_fileSize.getStr(strSize) && m_size.fromStr(strSize);

// notify canvas to redraw
  m_canvas.redraw();
}

/// (re-)get destination position on canvas
void Canvas::Input::getDestPos()
{
  std::string strPos;

// read destination position from file and parse it
  m_haveDestPos = m_fileDestPos.getStr(strPos) && m_destPos.fromStr(strPos);

// notify canvas to redraw
  m_canvas.redraw();
}

} // namespace Blinker

Blinker

simplified interface of getCurFrame mehtods