kolourpaint/commands/kpCommandSize.h

   1
   2 /*
   3    Copyright (c) 2003-2007 Clarence Dang <dang@kde.org>
   4    All rights reserved.
   5
   6    Redistribution and use in source and binary forms, with or without
   7    modification, are permitted provided that the following conditions
   8    are met:
   9
  10    1. Redistributions of source code must retain the above copyright
  11       notice, this list of conditions and the following disclaimer.
  12    2. Redistributions in binary form must reproduce the above copyright
  13       notice, this list of conditions and the following disclaimer in the
  14       documentation and/or other materials provided with the distribution.
  15
  16    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26 */
  27
  28
  29 #ifndef kpCommandSize_H
  30 #define kpCommandSize_H
  31
  32
  33 #include <kpImage.h>
  34
  35
  36 class QImage;
  37 class QPixmap;
  38 class QPolygon;
  39 class QString;
  40
  41 class kpAbstractSelection;
  42
  43
  44 //
  45 // Estimates the size of the object being pointed to, in bytes.
  46 //
  47 // This is used by the command history to trim stored commands, once a
  48 // certain amount of memory is used by those commands.
  49 //
  50 class kpCommandSize
  51 {
  52 public:
  53     // Force 64-bit arithmetic, instead of 32-bit, to prevent overflow
  54     // when determining whether to clip the command history -- we might be
  55     // adding a large number of large sizes.  This will eventually help
  56     // KolourPaint support more than 2GB of image data.
  57     //
  58     // For some reason, GCC doesn't warn of accidental casts to smaller types
  59     // (e.g. 32-bit).  An easy way to get around this is to change "SizeType"
  60     // to be "double" temporarily and recompile - every time an implicit cast to
  61     // "int" (32-bit) is made, we'll be warned.
  62     //
  63     // TODO: Exhaustively test that we're not accidentally doing intermediate
  64     //       calculations using 32-bit in some places (mainly inside
  65     //       implementations of kpCommand::size()).
  66     typedef qlonglong SizeType;
  67
  68     static SizeType PixmapSize (const QPixmap &pixmap);
  69     static SizeType PixmapSize (const QPixmap *pixmap);
  70     static SizeType PixmapSize (int width, int height, int depth);
  71
  72     static SizeType QImageSize (const QImage &image);
  73     static SizeType QImageSize (const QImage *image);
  74     static SizeType QImageSize (int width, int height, int depth);
  75
  76     static SizeType ImageSize (const kpImage &image);
  77     static SizeType ImageSize (const kpImage *image);
  78
  79     static SizeType SelectionSize (const kpAbstractSelection &sel);
  80     static SizeType SelectionSize (const kpAbstractSelection *sel);
  81
  82     static SizeType StringSize (const QString &string);
  83
  84     static SizeType PolygonSize (const QPolygon &points);
  85 };
  86
  87
  88 #endif  // kpCommandSize_H