canvas.cpp

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/***********************************************************************
 Freeciv - Copyright (C) 1996-2005 - Freeciv Development Team
   This program 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 2, or (at your option)
   any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
***********************************************************************/
 
#ifdef HAVE_CONFIG_H
#include <fc_config.h>
#endif
 
// Qt
#include <QFontMetrics>
#include <QPainter>
#include <QPainterPath>
 
// qt-client
#include "canvas.h"
#include "colors.h"
#include "fc_client.h"
#include "fonts.h"
#include "qtg_cxxside.h"
#include "sprite.h"
 
static QFont *get_font(enum client_font font);
 
/************************************************************************/
struct canvas *qtg_canvas_create(int width, int height)
{
  struct canvas *store = new canvas;
 
  store->map_pixmap = QPixmap(width, height);
  return store;
}
 
/************************************************************************/
void qtg_canvas_free(struct canvas *store)
{
  delete store;
}
 
/************************************************************************/
void qtg_canvas_set_zoom(struct canvas *store, float zoom)
{
  // Qt-client has no zoom support
}
 
/************************************************************************/
bool qtg_has_zoom_support()
{
  return FALSE;
}
 
/************************************************************************/
void qtg_canvas_mapview_init(struct canvas *store)
{
}
 
/************************************************************************/
void qtg_canvas_copy(struct canvas *dest, struct canvas *src,
                     int src_x, int src_y, int dest_x, int dest_y, int width,
                     int height)
{
 
  QRectF source_rect(src_x, src_y, width, height);
  QRectF dest_rect(dest_x, dest_y, width, height);
  QPainter p;
 
  if (!width || !height) {
    return;
  }
 
  p.begin(&dest->map_pixmap);
  p.drawPixmap(dest_rect, src->map_pixmap, source_rect);
  p.end();
 
}
 
/************************************************************************/
void pixmap_copy(QPixmap *dest, QPixmap *src, int src_x, int src_y,
                 int dest_x, int dest_y, int width, int height)
{
  QRectF source_rect(src_x, src_y, width, height);
  QRectF dest_rect(dest_x, dest_y, width, height);
  QPainter p;
 
  if (!width || !height) {
    return;
  }
 
  p.begin(dest);
  p.drawPixmap(dest_rect, *src, source_rect);
  p.end();
}
 
/************************************************************************/
void image_copy(QImage *dest, QImage *src, int src_x, int src_y,
                int dest_x, int dest_y, int width, int height)
{
  QRectF source_rect(src_x, src_y, width, height);
  QRectF dest_rect(dest_x, dest_y, width, height);
  QPainter p;
 
  if (!width || !height) {
    return;
  }
 
  p.begin(dest);
  p.drawImage(dest_rect, *src, source_rect);
  p.end();
}
 
/************************************************************************/
void qtg_canvas_put_sprite(struct canvas *pcanvas,
                           int canvas_x, int canvas_y,
                           struct sprite *sprite,
                           int offset_x, int offset_y, int width, int height)
{
  QPainter p;
 
  p.begin(&pcanvas->map_pixmap);
  p.drawPixmap(canvas_x, canvas_y, *sprite->pm, offset_x, offset_y, width, height);
  p.end();
}
 
/************************************************************************/
void qtg_canvas_put_sprite_full(struct canvas *pcanvas,
                                int canvas_x, int canvas_y,
                                struct sprite *sprite)
{
  int width, height;
 
  get_sprite_dimensions(sprite, &width, &height);
  canvas_put_sprite(pcanvas, canvas_x, canvas_y, sprite,
                    0, 0, width, height);
}
 
/************************************************************************/
void qtg_canvas_put_sprite_full_scaled(struct canvas *pcanvas,
                                       int canvas_x, int canvas_y,
                                       int canvas_w, int canvas_h,
                                       struct sprite *sprite)
{
  QPainter p;
  int width, height;
 
  get_sprite_dimensions(sprite, &width, &height);
 
  p.begin(&pcanvas->map_pixmap);
  p.drawPixmap(canvas_x, canvas_y, canvas_w, canvas_h,
               *sprite->pm, 0, 0, width, height);
  p.end();
}
 
/************************************************************************/
void qtg_canvas_put_sprite_fogged(struct canvas *pcanvas,
                                  int canvas_x, int canvas_y,
                                  struct sprite *psprite,
                                  bool fog, int fog_x, int fog_y)
{
  QPainter p;
 
  p.begin(&pcanvas->map_pixmap);
  p.setCompositionMode(QPainter::CompositionMode_Difference);
  p.setOpacity(0.5);
  p.drawPixmap(canvas_x, canvas_y, *psprite->pm);
  p.end();
}
 
/************************************************************************/
void qtg_canvas_put_rectangle(struct canvas *pcanvas,
                              struct color *pcolor,
                              int canvas_x, int canvas_y,
                              int width, int height)
{
 
  QBrush brush(pcolor->qcolor);
  QPen pen(pcolor->qcolor);
  QPainter p;
 
  p.begin(&pcanvas->map_pixmap);
  p.setPen(pen);
  p.setBrush(brush);
  if (width == 1 && height == 1) {
    p.drawPoint(canvas_x, canvas_y);
  } else if (width == 1) {
    p.drawLine(canvas_x, canvas_y, canvas_x, canvas_y + height -1);
  } else if (height == 1) {
    p.drawLine(canvas_x, canvas_y, canvas_x + width - 1, canvas_y);
  } else {
    p.drawRect(canvas_x, canvas_y, width, height);
  }
 
  p.end();
}
 
/************************************************************************/
void qtg_canvas_fill_sprite_area(struct canvas *pcanvas,
                                 struct sprite *psprite, struct color *pcolor,
                                 int canvas_x, int canvas_y)
{
  int width, height;
 
  get_sprite_dimensions(psprite, &width, &height);
  qtg_canvas_put_rectangle(pcanvas, pcolor, canvas_x, canvas_y, width, height);
}
 
/************************************************************************/
void qtg_canvas_put_line(struct canvas *pcanvas, struct color *pcolor,
                         enum line_type ltype, int start_x, int start_y,
                         int dx, int dy)
{
  QPen pen;
  QPainter p;
 
  pen.setColor(pcolor->qcolor);
 
  switch (ltype) {
  case LINE_NORMAL:
    pen.setWidth(1);
    break;
  case LINE_BORDER:
    pen.setStyle(Qt::DashLine);
    pen.setDashOffset(4);
    pen.setWidth(1);
    break;
  case LINE_TILE_FRAME:
    pen.setWidth(2);
    break;
  case LINE_GOTO:
    pen.setWidth(2);
    break;
  default:
    pen.setWidth(1);
    break;
  }
 
  p.begin(&pcanvas->map_pixmap);
  p.setPen(pen);
  p.setRenderHint(QPainter::Antialiasing);
  p.drawLine(start_x, start_y, start_x + dx, start_y + dy);
  p.end();
}
 
/************************************************************************/
void qtg_canvas_put_curved_line(struct canvas *pcanvas, struct color *pcolor,
                                enum line_type ltype, int start_x, int start_y,
                                int dx, int dy)
{
  QPen pen;
  pen.setColor(pcolor->qcolor);
  QPainter p;
  QPainterPath path;
 
  switch (ltype) {
  case LINE_NORMAL:
    pen.setWidth(1);
    break;
  case LINE_BORDER:
    pen.setStyle(Qt::DashLine);
    pen.setDashOffset(4);
    pen.setWidth(2);
    break;
  case LINE_TILE_FRAME:
    pen.setWidth(2);
    break;
  case LINE_GOTO:
    pen.setWidth(2);
    break;
  default:
    pen.setWidth(1);
    break;
  }
 
  p.begin(&pcanvas->map_pixmap);
  p.setRenderHints(QPainter::Antialiasing);
  p.setPen(pen);
 
  path.moveTo(start_x, start_y);
  path.cubicTo(start_x + dx / 2, start_y, start_x, start_y + dy / 2,
               start_x + dx, start_y + dy);
  p.drawPath(path);
  p.end();
}
 
/************************************************************************/
void qtg_get_text_size(int *width, int *height,
                       enum client_font font, const char *text)
{
  QFont *afont;
  QFontMetrics *fm;
 
  afont = get_font(font);
  fm = new QFontMetrics(*afont);
  if (width) {
    *width = fm->horizontalAdvance(QString::fromUtf8(text));
  }
 
  if (height) {
    *height = fm->height();
  }
  delete fm;
}
 
/************************************************************************/
void qtg_canvas_put_text(struct canvas *pcanvas, int canvas_x, int canvas_y,
                         enum client_font font, struct color *pcolor,
                         const char *text)
{
  QPainter p;
  QPen pen;
  QFont *afont;
  QColor color(pcolor->qcolor);
  QFontMetrics *fm;
 
  afont = get_font(font);
  pen.setColor(color);
  fm = new QFontMetrics(*afont);
 
  p.begin(&pcanvas->map_pixmap);
  p.setPen(pen);
  p.setFont(*afont);
  p.drawText(canvas_x, canvas_y + fm->ascent(), QString::fromUtf8(text));
  p.end();
  delete fm;
}
 
/************************************************************************/
QFont *get_font(client_font font)
{
  QFont *qf;
  int ssize;
 
  switch (font) {
  case FONT_CITY_NAME:
  qf = fc_font::instance()->get_font(fonts::city_names);
    if (gui()->map_scale != 1.0f && gui()->map_font_scale) {
     ssize = ceil(gui()->map_scale * fc_font::instance()->city_fontsize);
      if (qf->pointSize() != ssize) {
        qf->setPointSize(ssize);
      }
    }
    break;
  case FONT_CITY_PROD:
    qf = fc_font::instance()->get_font(fonts::city_productions);
    if (gui()->map_scale != 1.0f && gui()->map_font_scale) {
      ssize = ceil(gui()->map_scale * fc_font::instance()->prod_fontsize);
      if (qf->pointSize() != ssize) {
        qf->setPointSize(ssize);
      }
    }
    break;
  case FONT_REQTREE_TEXT:
    qf = fc_font::instance()->get_font(fonts::reqtree_text);
    break;
  case FONT_COUNT:
    qf = nullptr;
    break;
  default:
    qf = nullptr;
    break;
  }
  return qf;
}
 
/************************************************************************/
QRect zealous_crop_rect(QImage &p)
{
  int r, t, b, l;
  int oh, ow;
  QRgb *row;
 
  ow = p.width();
  l = ow;
  r = 0;
  oh = p.height();
  t = oh;
  b = 0;
 
  row = (QRgb *)fc_malloc(sizeof(QRgb) * ow);
 
  for (int y = 0; y < oh; y++) {
    bool row_filled = false;
    int x;
 
    /* Copy to a location with guaranteed QRgb suitable alignment.
     * That fixes clang compiler warning. */
    memcpy(row, p.scanLine(y), ow * sizeof(QRgb));
 
    for (x = 0; x < ow; ++x) {
      if (qAlpha(row[x])) {
        row_filled = true;
        r = qMax(r, x);
        if (l > x) {
          l = x;
          x = r;
        }
      }
    }
    if (row_filled) {
      t = qMin(t, y);
      b = y;
    }
  }
 
  free(row);
 
  return QRect(l, t, qMax(0, r - l + 1), qMax(0, b - t + 1));
}