ViewportBufferFill.cpp

 
/* SPDX-License-Identifier: CC0-1.0 */
 
#include "ViewportBufferFill.h"
 
#include <algorithm>
#include <iostream>
 
#include <QRect>
#include <QPoint>
 
using namespace std;
 
namespace Isis {
  ViewportBufferFill::ViewportBufferFill(const QRect &rect,
      const int &xCoef, const double &xScale, const int &yCoef,
      const double &yScale, const QPoint &topLeftPixel)
      : ViewportBufferAction() {
    p_rect = NULL;
    p_topLeftPixel = NULL;
 
    p_rect = new QRect(rect);
    p_topLeftPixel = new QPoint(topLeftPixel);
    p_requestPosition = rect.top();
    p_readPosition = rect.top();
    p_xCoef = xCoef;
    p_xScale = xScale;
    p_yCoef = yCoef;
    p_yScale = yScale;
  }
 
  ViewportBufferFill::~ViewportBufferFill() {
    if(p_rect) {
      delete p_rect;
      p_rect = NULL;
    }
 
    if(p_topLeftPixel) {
      delete p_topLeftPixel;
      p_topLeftPixel = NULL;
    }
  }
 
  int ViewportBufferFill::getTopmostPixelPosition() {
    return p_topLeftPixel->y();
  }
 
 
  int ViewportBufferFill::getLeftmostPixelPosition() {
    return p_topLeftPixel->x();
  }
 
 
  bool ViewportBufferFill::doneReading() {
    return p_readPosition >= (unsigned)(p_rect->top() + p_rect->height());
  }
 
 
  bool ViewportBufferFill::shouldRequestMore() {
    return p_requestPosition < (unsigned)(p_rect->top() + p_rect->height());
  }
 
 
  void ViewportBufferFill::stop() {
    p_rect->setBottom(p_requestPosition - 1);
  }
 
 
  bool ViewportBufferFill::shouldPaint(int &linesToPaint) {
    if(p_rect->height() < STEPSIZE)
      linesToPaint = p_rect->height();
    else
      linesToPaint = STEPSIZE;
 
    return p_readPosition % STEPSIZE == 0 || doneReading();
  }
}