Technical facts

Application type(s)

Desktop application

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

GUI application

C++ standard:

C++11

Compiler(s):

G++ 4.9.2

Libraries used:

Qt: version 5.4.1 (32 bit)
STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppQImageExample3/CppQImageExample3.pro


win32 {

  # Windows only

  message("Console application, built for Windows")

  QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

}



macx {

  # Mac only

  message("Console application, built for Mac")

  QMAKE_CXXFLAGS = -mmacosx-version-min=10.7 -std=gnu0x -stdlib=libc+

  CONFIG +=c++11

}



unix:!macx{

  # Linux only

  message("Console application, built for Linux")

  QMAKE_CXXFLAGS += -Werror

  QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

}



cross_compile {

  # Crosscompile only

  message("Console application, cross-compiling from Linux to Windows")

  QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

}





# Go ahead and use Qt.Core: it is about as platform-independent as

# the STL and Boost

QT += core



# Go ahead and use Qt.Gui: it is about as platform-independent as

# the STL and Boost. It is needed for QImage

QT += gui



# Don't define widgets: it would defy the purpose of this console

# application to work non-GUI

#greaterThan(QT_MAJOR_VERSION, 4): QT += widgets



CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app



#

#

# Type of compile

#

#



CONFIG(release, debug|release) {

  DEFINES += NDEBUG NTRACE_BILDERBIKKEL

}



SOURCES += main.cpp

./CppQImageExample3/main.cpp


#include <cassert>



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#pragma GCC diagnostic ignored "-Wunused-but-set-parameter"

#include <QImage>

#pragma GCC diagnostic pop



QImage CreateImage(const int width, const int height, const int z) noexcept

{

  QImage image(width,height,QImage::Format_ARGB32);

  for (int y=0;y!=height;++y)

  {

    for (int x=0;x!=width;++x)

    {

      image.setPixel(

        x,y,

        qRgb((x+z+0)%256,(y+z+0)%256,(x+y+z)%256) //Color

      );

    }

  }

  return image;

}



void DrawImage(

  QImage& target, const QImage& source,

  const int left, const int top

) noexcept

{

  const int width = source.width();

  const int height = source.height();

  for (int y=0; y!=height; ++y)

  {

    for (int x=0; x!=width; ++x)

    {

      target.setPixel(left+x,top+y,source.pixel(x,y));

    }

  }

}



QImage DrawTiled(

  const int n_cols, const int n_rows,

  const QImage& a, const QImage& b

) noexcept

{

  assert(a.width()  == b.width());

  assert(a.height() == b.height());

  const int block_width  = a.width();

  const int block_height = a.height();

  const int width  = n_rows * block_width;

  const int height = n_cols * block_height;

  QImage result(width,height,QImage::Format_ARGB32);

  for (int y=0; y!=n_rows; ++y)

  {

    for (int x=0; x!=n_cols; ++x)

    {

      DrawImage(

        result,

        (std::rand() >> 4) % 2 ? a : b,

        block_width * x,

        block_width * y

      );

    }

  }

  return result;

}



int main()

{

  const QImage a = CreateImage(64,64,0);

  const QImage b = CreateImage(64,64,128);

  const QImage c = DrawTiled(4,4,a,b);

  c.save("CppQImageExample3.png");

}

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(C++) QImageExample3

Technical facts

Qt project file: ./CppQImageExample3/CppQImageExample3.pro

./CppQImageExample3/main.cpp