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(C++) QImageExample2

 

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Qt project file: ./CppQImageExample2/CppQImageExample2.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

 

 

 

 

 

./CppQImageExample2/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));
    }
  }
}

int main()
{
  QImage a = CreateImage(256,256,64);
  const QImage b = CreateImage(196,156,196);
  DrawImage(a,b,32,64);
  a.save("CppQImageExample2.png");
}

 

 

 

 

 

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