src/loader/image.h

   1 /*
   2   Copyright (c) 2006 Paolo Capriotti <p.capriotti@sns.it>
   3             (c) 2006 Maurizio Monge <maurizio.monge@kdemail.net>
   4
   5   This program is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation; either version 2 of the License, or
   8   (at your option) any later version.
   9 */
  10
  11 #ifndef LOADER__IMAGE_H
  12 #define LOADER__IMAGE_H
  13
  14 #include <boost/shared_ptr.hpp>
  15 #include <QColor>
  16 #include <QMatrix>
  17 #include <QBrush>
  18 #include <QFont>
  19 #include <QImage>
  20
  21 class QPainter;
  22
  23 /**
  24   * @namespace Loader
  25   * @brief Namespace holding image (and more generally resource) loading functions
  26   */
  27 namespace Loader {
  28
  29
  30 class Context;
  31
  32
  33 /**
  34   * @class Image <loader/image.h>
  35   * @brief The image class to be used with lua
  36   */
  37 class Image {
  38 private:
  39   QImage  m_image;
  40   QMatrix m_draw_matrix;
  41   double  m_draw_opacity;
  42   bool    m_draw_over;
  43
  44   void init_painter(QPainter*);
  45
  46 public:
  47
  48   /**
  49    * Creates an image. Image data will be undefined.
  50    * @param width The width of the image.
  51    * @param height The height of the image.
  52    */
  53   Image(int width,
  54         int height);
  55
  56
  57   /**
  58    * Creates an image from a file. If the files is not found or could not be
  59    * loaded, the resulting image will have width and height equal to 0
  60    * @param ctx The current context (theme) reference (should be implicit in lua)
  61    * @param file The file name.
  62    */
  63   Image(Context* ctx,
  64         const QString& file,
  65         bool use_cache = true);
  66
  67
  68   /** \return the QImage */
  69   QImage image() { return m_image; }
  70
  71   /** Returns the width of the image */
  72   int width() {
  73     return m_image.width();
  74   }
  75
  76
  77   /** Returns the height of the image */
  78   int height() {
  79     return m_image.height();
  80   }
  81
  82
  83   /**
  84    * Sets the transformation matrix
  85    */
  86   void setMatrix(const QMatrix& m) {
  87     m_draw_matrix = m;
  88   }
  89
  90
  91   /**
  92    * Resets the transformation matrix
  93    */
  94   void resetMatrix() {
  95     m_draw_matrix.reset();
  96   }
  97
  98
  99   /**
 100    * Scales the transformation matrix
 101    */
 102   void scale(double x, double y) {
 103     m_draw_matrix = m_draw_matrix * QMatrix().scale(x,y);
 104   }
 105
 106
 107   /**
 108    * Rotates the transformation matrix
 109    */
 110   void rotate(double angle) {
 111     m_draw_matrix = m_draw_matrix * QMatrix().rotate(angle);
 112   }
 113
 114
 115   /**
 116    * Translates the transformation matrix
 117    */
 118   void translate(double x, double y) {
 119     m_draw_matrix = m_draw_matrix * QMatrix().translate(x,y);
 120   }
 121
 122
 123   /**
 124    * Returns the transformation matrix
 125    */
 126   QMatrix matrix() {
 127     return m_draw_matrix;
 128   }
 129
 130
 131   /**
 132    * Sets the opacity of the drawing operations
 133    */
 134   void setOpacity(double o) {
 135     m_draw_opacity = o;
 136   }
 137
 138
 139   /**
 140    * Returns the opacity of the drawing operations
 141    */
 142   double opacity() {
 143     return m_draw_opacity;
 144   }
 145
 146
 147   /**
 148    * Sets the composition mode
 149    * @param over If true the painting operations will paint over,
 150    *               if false will replace the destination color.
 151    */
 152   void setPaintOver(bool over) {
 153     m_draw_over = over;
 154   }
 155
 156
 157   /**
 158    * Clears the image.
 159    * @param color The color to fill the image with (default transparent)
 160    */
 161   void clear(const QColor& color = Qt::transparent);
 162
 163
 164   /**
 165    * Fills a rectangle.
 166    * @param rect The rectangle
 167    * @param brush The fill brush
 168    */
 169   void fillRect(const QRectF& rect,
 170                 const QBrush& brush);
 171
 172
 173   /**
 174    * Draws a line.
 175    * @param from The starting point
 176    * @param to The end point
 177    * @param col The pen color
 178    * @param width The pen width
 179    */
 180   void drawLine(const QPointF& from,
 181                 const QPointF& to,
 182                 const QColor& col,
 183                 double width);
 184
 185
 186   /**
 187    * Draws an image on the over the current one.
 188    * @param dest The destination rectangle.
 189    * @param src_img The source image.
 190    * @param src The source rectangle.
 191    */
 192   void drawImage(const QRectF& dest,
 193                  const Image& src_img,
 194                  const QRectF& src = QRectF(0.0,0.0,0.0,0.0));
 195
 196
 197   /**
 198    * Draws an image on the over the current one (overload).
 199    * @param ctx The current context (theme) reference (should be implicit in lua)
 200    * @param dest The destination rectangle.
 201    * @param src_img The source image file.
 202    * @param src The source rectangle, WITH RELATIVE COORDINATES 0.0 - 1.0 (of course).
 203    * @return True if it was possible to load the image file.
 204    */
 205   bool drawImage(Context* ctx,
 206                  const QRectF& dest,
 207                  const QString& src_img,
 208                  const QRectF& src = QRectF(0.0,0.0,0.0,0.0),
 209                  bool use_cache = true);
 210
 211
 212   /**
 213    * Draws an SVG file over the image.
 214    * @param ctx The current context (theme) reference (should be implicit in lua)
 215    * @param dest The destination rectangle.
 216    * @param file The file to load.
 217    * @return True if it was possible to load the SVG file.
 218    * TODO: add css support (When Qt will support it)
 219    */
 220   bool drawSVG(Context* ctx,
 221                const QRectF& dest,
 222                const QString& file);
 223
 224
 225   /**
 226    * Draws a font glyph over the image.
 227    * @param ctx The current context (theme) reference (should be implicit in lua)
 228    * @param dest The destination rectangle.
 229    * @param font The font file to load.
 230    * @param glyph The unicode glyph code.
 231    * @param fg The foreground color.
 232    * @param bg The background color.
 233    * @param border The background expansion.
 234    * @param draw_inner_bg If true the 'inner part' (detected with a flood fill
 235                           algorithm) will be filled with the background brush.
 236    * @return True if it was possible to load the font file and find the glyph.
 237    */
 238   bool drawGlyph(Context* ctx,
 239                  const QRectF& dest,
 240                  const QString& font,
 241                  unsigned int glyph,
 242                  const QBrush& fg = Qt::black,
 243                  const QBrush& bg = Qt::white,
 244                  double border = 0.0,
 245                  bool draw_inner_bg = true);
 246
 247
 248   /**
 249    * Blurs the image itself.
 250    */
 251   void expBlur(double radius);
 252
 253   /**
 254    * Returns a shadow image for the current image.
 255    * @param radius The shadow radius.
 256    * @param color  The shadow color.
 257    * @param grow   How bigger the output image will be.
 258    * @param offset Position of the shadow (relatively from being centered in the output).
 259    */
 260   Image createShadow(double radius,
 261                      const QColor& color,
 262                      const QPoint& grow = QPoint(),
 263                      const QPointF& offset = QPointF() );
 264 };
 265
 266 /**
 267   * @class Glyph <loader/image.h>
 268   * @brief A simple class that represents a glyph in a font to be used with lua
 269   */
 270 class Glyph {
 271 private:
 272   friend class Theme;
 273   bool m_font_valid;
 274   QFont m_font;
 275   QChar m_char;
 276   int m_delta;
 277
 278 public:
 279   Glyph(Context* ctx, const QString&, QChar, int = 0);
 280   Glyph(QChar = QChar());
 281
 282   QFont font() { return m_font; }
 283   bool fontValid() { return m_font_valid; }
 284   QChar ch() { return m_char; }
 285   int delta() { return m_delta; }
 286 };
 287
 288
 289 typedef boost::shared_ptr<class Font> FontPtr;
 290
 291 class Font {
 292 private:
 293   friend class Image;
 294   friend class Glyph;
 295
 296   QString     m_file;
 297   int         m_id;
 298   QStringList m_families;
 299   QFont       m_font;
 300
 301 public:
 302   Font(int id, int size = 128);
 303   Font(const QFont& font);
 304   ~Font();
 305
 306   QFont font() { return m_font; }
 307   QStringList families() { return m_families; }
 308
 309   static FontPtr create(Context* ctx, const QString& file);
 310 };
 311
 312
 313 } //end namespace Loader
 314
 315 #endif //LOADER__IMAGE_H