sprite.cpp

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/*
 Copyright (c) 1996-2023 Freeciv21 and Freeciv contributors. This file is
 part of Freeciv21. Freeciv21 is free software: you can redistribute it
 and/or modify it under the terms of the GNU  General Public License  as
 published by the Free Software Foundation, either version 3 of the
 License,  or (at your option) any later version. You should have received
 a copy of the GNU General Public License along with Freeciv21. If not,
 see https://www.gnu.org/licenses/.
 */
 
// Qt
#include <QImageReader>
#include <QPainter>
// utility
#include "log.h"
// client
#include "fc_client.h"
#include "sprite.h"
 
QPixmap *load_gfxfile(const char *filename)
{
  QPixmap *entire = new QPixmap;
 
  if (QPixmapCache::find(QString(filename), entire)) {
    return entire;
  }
  entire->load(QString(filename));
  QPixmapCache::insert(QString(filename), *entire);
 
  return entire;
}
 
QPixmap *crop_sprite(const QPixmap *source, int x, int y, int width,
                     int height, const QPixmap *mask, int mask_offset_x,
                     int mask_offset_y)
{
  QPainter p;
  QRectF source_rect;
  QRectF dest_rect;
  QPixmap *cropped;
 
  fc_assert_ret_val(source, nullptr);
 
  if (!width || !height) {
    return nullptr;
  }
  cropped = new QPixmap(width, height);
  cropped->fill(Qt::transparent);
  source_rect = QRectF(x, y, width, height);
  dest_rect = QRectF(0, 0, width, height);
 
  p.begin(cropped);
  p.setRenderHint(QPainter::Antialiasing);
  p.drawPixmap(dest_rect, *source, source_rect);
  p.end();
 
  if (mask) {
    int mw = mask->width();
    int mh = mask->height();
 
    source_rect = QRectF(0, 0, mw, mh);
    dest_rect = QRectF(mask_offset_x - x, mask_offset_y - y, mw, mh);
    p.begin(cropped);
    p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
    p.setRenderHint(QPainter::Antialiasing);
    p.setRenderHint(QPainter::SmoothPixmapTransform);
    p.drawPixmap(dest_rect, *mask, source_rect);
    p.end();
  }
 
  return cropped;
}