1 #define GLUT_DISABLE_ATEXIT_HACK  2 #include 
     
        3 #include 
      
         4 #include 
       
          5 #pragma comment(lib,"glaux.lib")  6   7   8 AUX_RGBImageRec* Image;  9 GLint iWidth,iHeight,iMode=1; 10 GLubyte* pImage; 11  12 void Initialization(void); 13 void MenuCreate(void); 14 void OnDisplay(void); 15 void OnReshape(int,int); 16 void OnMenu(int); 17  18 void main(int argc,char* argv[]) 19 { 20     glutInit(&argc,argv); 21     glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH); 22     glutInitWindowSize(400,400); 23     glutCreateWindow("EXAM703"); 24  25     glutCreateMenu(OnMenu); 26     glutDisplayFunc(OnDisplay); 27     glutReshapeFunc(OnReshape); 28      29     Initialization(); 30     glutMainLoop(); 31 } 32  33 void Initialization(void) 34 { 35     glClearColor(0,0,0,1); 36  37     MenuCreate(); 38  39     glPixelStorei(GL_UNPACK_ALIGNMENT,1); 40     Image=auxDIBImageLoad("11.bmp"); 41     iWidth=Image->sizeX; 42     iHeight=Image->sizeY; 43     pImage=Image->data; 44 } 45  46 void OnDisplay(void) 47 { 48     glClear(GL_COLOR_BUFFER_BIT); 49  50     GLbyte *pModified=NULL; 51     GLfloat invert[256]; 52     GLint i; 53  54     glRasterPos2i(0,0); 55  56     switch(iMode){ 57     case 2: 58         glPixelZoom(-1.0f,-1.0f); 59         glRasterPos2i(iWidth-1,iHeight-1); 60         break; 61  62     case 3: 63         glPixelZoom(0.5f,0.5f); 64         break; 65  66     case 4: 67         glPixelTransferf(GL_RED_SCALE,1.0f); 68         glPixelTransferf(GL_GREEN_SCALE,0.0f); 69         glPixelTransferf(GL_BLUE_SCALE,0.0f); 70         break; 71  72     case 5: 73         glPixelTransferf(GL_RED_SCALE,0.0f); 74         glPixelTransferf(GL_GREEN_SCALE,1.0f); 75         glPixelTransferf(GL_BLUE_SCALE,0.0f); 76         break; 77  78     case 6: 79         glPixelTransferf(GL_RED_SCALE,0.0f); 80         glPixelTransferf(GL_GREEN_SCALE,0.0f); 81         glPixelTransferf(GL_BLUE_SCALE,1.0f); 82         break; 83  84     case 7: 85         glDrawPixels(iWidth,iHeight,GL_RGB,GL_UNSIGNED_BYTE,pImage); 86         pModified=(GLbyte*)new GLbyte[iWidth*iHeight]; 87          88         glPixelTransferf(GL_RED_SCALE,0.3f); 89         glPixelTransferf(GL_GREEN_SCALE,0.59f); 90         glPixelTransferf(GL_BLUE_BITS,0.11f); 91  92         glReadPixels(0,0,iWidth,iHeight,GL_LUMINANCE,GL_UNSIGNED_BYTE,pModified); 93         glPixelTransferf(GL_RED_SCALE,1.0f); 94         glPixelTransferf(GL_GREEN_SCALE,1.0f); 95         glPixelTransferf(GL_BLUE_SCALE,1.0f); 96         break; 97  98     case 8: 99         invert[0]=1.0f;100         for(i=1;i<256;i++)101             invert[i]=1.0f-(1.0f/255.0f*GLfloat(i));102 103         glPixelMapfv(GL_PIXEL_MAP_R_TO_R,255,invert);104         glPixelMapfv(GL_PIXEL_MAP_G_TO_G,255,invert);105         glPixelMapfv(GL_PIXEL_MAP_B_TO_B,255,invert);106         glPixelTransferf(GL_MAP_COLOR,GL_TRUE);107         break;108 109     case 1:110     default:111         break;112 113     }114 115     if(pModified==NULL)116         glDrawPixels(iWidth,iHeight,GL_RGB,GL_UNSIGNED_BYTE,pImage);117     else{118         glDrawPixels(iWidth,iHeight,GL_LUMINANCE,GL_UNSIGNED_BYTE,pModified);119         delete []pModified;120     }121 122     glPixelTransferi(GL_MAP_COLOR,GL_FALSE);123     glPixelTransferf(GL_RED_SCALE,1.0f);124     glPixelTransferf(GL_GREEN_SCALE,1.0f);125     glPixelTransferf(GL_BLUE_SCALE,1.0f);126     glPixelZoom(1.0f,1.0f);127 128     glutSwapBuffers();129 }130 131 void OnReshape(int w,int h)132 {133     GLfloat aspectRatio=(GLfloat)w/(GLfloat)h;//计算窗口的纵横比134     GLfloat winWidth,winHeight;135     136     137     glViewport(0,0,w,h);138     139     140     glMatrixMode(GL_PROJECTION);141     glLoadIdentity();142     143     144     if(w<=h){                               //根据纵横比计算绘图区域的宽和高145         winWidth=400;146         winHeight=400*aspectRatio;147     }148     else{149         winWidth=400*aspectRatio;150         winHeight=400;151     }152     gluOrtho2D(0,winWidth,0,winHeight);153     154     155     glMatrixMode(GL_MODELVIEW);156     glLoadIdentity();157 158 }159 160 void OnMenu(int value)161 {162     iMode=value;163     164     glutPostRedisplay();165 }166 167 void MenuCreate(void)168 {169     glutAddMenuEntry("正常显示",1);170     glutAddMenuEntry("翻转图像",2);171     glutAddMenuEntry("缩小图像",3);172     glutAddMenuEntry("红色通道",4);173     glutAddMenuEntry("绿色通道",5);174     glutAddMenuEntry("蓝色通道",6);175     glutAddMenuEntry("灰度图",7);176     glutAddMenuEntry("反转颜色",8);177 178     glutAttachMenu(GLUT_RIGHT_BUTTON);179 180 }