#include <stdio.h> #include <unistd.h> #include <directfb/directfb.h> static IDirectFB *dfb = NULL; static IDirectFBEventBuffer *events = NULL; static IDirectFBSurface *primary = NULL; static IDirectFBSurface *logo = NULL;//此IDirectFBSurface为用于显示的图片 static DFBSurfaceDescription dsc; static IDirectFBImageProvider *provider; //要显示图片，必须要有一个IDirectFBImageProvider， //此接口一般用于收集图片信息， //并将图片提供给IDirectFBSurface显示 static int screen_width = 0; static int screen_height = 0; static int pic_x = 0; //图片的x坐标 static int pic_y = 0; //图片的y坐标 int myBitBlit(int x, int y)//绘制图形 { primary->FillRectangle(primary, 0, 0, screen_width - 1,screen_height - 1); primary->Blit(primary, logo, NULL, x, y); //primary->Blit(primary, logo, NULL, i, (screen_height- dsc.height) / 2); //上面Blit函数原型为： //Blit(IDirectFBSurface *thiz, IDirectFBSurface *source, const DFBRectangle *source_rect, int x, int y); //如果source_rect为NULL，则使用整个平面。DFBRctangle为一个矩形框，由两个点的坐标确定。 //x, y为图像左上角在屏幕上的坐标。 primary->Flip(primary, NULL, DSFLIP_WAITFORSYNC); return 0; } int exit_app( void)//注销函数，销毁申请的变量 { /* Release the event buffer. */ if (events){ events->Release( events ); } if(logo){ logo->Release(logo); } if(primary){ primary->Release(primary); } if(dfb){ dfb->Release(dfb); } exit(0); } int actionMonitor(void) { DFBEvent evt; events->WaitForEvent(events); //等待事件 while(events->GetEvent(events, &evt) == DFB_OK){ if(evt.clazz != DFEC_INPUT){//判断是否是输入事件 break; } if(evt.input.type == DIET_KEYPRESS){//响应键盘事件 switch (evt.input.key_symbol){ case DIKI_ENTER: printf( "ENTER %s(%d); /n", __FILE__, __LINE__); break; case DIKS_ESCAPE: case DIKS_POWER: case DIKS_BACK: case DIKS_SMALL_Q: case DIKS_CAPITAL_Q: return -1; break; case DIKS_CURSOR_LEFT: case DIKI_LEFT: pic_x--; printf( "LEFT %s(%d); /n", __FILE__, __LINE__); break; case DIKS_CURSOR_RIGHT: case DIKI_RIGHT: pic_x++; printf( "RIGHT %s(%d); /n", __FILE__, __LINE__); break; case DIKS_CURSOR_UP: case DIKI_UP: pic_y--; printf( "UP %s(%d); /n", __FILE__, __LINE__); break; case DIKS_CURSOR_DOWN: case DIKI_DOWN: pic_y++; printf( "DOWN %s(%d); /n", __FILE__, __LINE__); break; default: break; } }//if(evt.input.type == DIET_KEYPRESS)//响应键盘事件 if(evt.input.type == DIET_AXISMOTION){//响应鼠标事件 if(evt.input.flags & DIEF_AXISREL){ switch(evt.input.axis){ case DIAI_X: pic_x += evt.input.axisrel; break; case DIAI_Y: pic_y += evt.input.axisrel; break; default : break; }//switch(evt.input.axis){ if(pic_x < 0){pic_x = 0;} if(pic_y < 0){pic_y = 0;} } }//if DIET_AXISMOTION){//响应鼠标事件 }//while(!quit && events->GetEvent(events, &evt) == DFB_OK) return 0; } //int actionMonitor(void )//事件监听只响应键盘 //{ // DFBInputEvent event; // // while (events->GetEvent( events, DFB_EVENT(&event) ) == DFB_OK){ // if (event.type == DIET_KEYPRESS){ // switch (event.key_symbol){ // case DIKI_ENTER: // printf( "ENTER %s(%d); /n", __FILE__, __LINE__); // break; // case DIKS_ESCAPE: // case DIKS_POWER: // case DIKS_BACK: // case DIKS_SMALL_Q: // case DIKS_CAPITAL_Q: // return -1; // break; // // case DIKS_CURSOR_LEFT: // case DIKI_LEFT: // pic_x--; // printf( "LEFT %s(%d); /n", __FILE__, __LINE__); // break; // case DIKS_CURSOR_RIGHT: // case DIKI_RIGHT: // pic_x++; // printf( "RIGHT %s(%d); /n", __FILE__, __LINE__); // break; // case DIKS_CURSOR_UP: // case DIKI_UP: // pic_y--; // printf( "UP %s(%d); /n", __FILE__, __LINE__); // break; // case DIKS_CURSOR_DOWN: // case DIKI_DOWN: // pic_y++; // printf( "DOWN %s(%d); /n", __FILE__, __LINE__); // break; // default: // break; // } // }//if (event.type == DIET_KEYPRESS){ // } // // return 0; //} int main(int argc, char **argv) { int ret = 0; DirectFBInit(&argc, &argv);//程序初始化语句 DirectFBCreate(&dfb); dfb->SetCooperativeLevel(dfb, DFSCL_FULLSCREEN); dsc.flags = DSDESC_CAPS; dsc.caps = DSCAPS_PRIMARY | DSCAPS_FLIPPING; dfb->CreateSurface(dfb, &dsc, &primary); primary->GetSize(primary, &screen_width, &screen_height); //利用指定的图片来创建一个image provider dfb->CreateImageProvider(dfb, "./my.jpg", &provider); //获取一个DFBSurfaceDescription，此描述与image provider中的图像相匹配 provider->GetSurfaceDescription(provider, &dsc); //利用平面描述来创建一个平面，在这里，这个平面即与图像相匹配 dfb->CreateSurface(dfb, &dsc, &logo); //将图像呈递给logo，并自动进行缩放，要注意：如果图像带有alpha通道，则目的层（logo）的像素格式为ARGB， //否则图像文件的透明部分将会和黑色背景混合，这里DFBRectangle参数用的是NULL，则将自动进行缩放 provider->RenderTo(provider, logo, NULL); //到此，provider已经没用，这里将其释放 provider->Release(provider); ret = dfb->CreateInputEventBuffer( dfb, DICAPS_ALL, DFB_TRUE, &events ); //ret = dfb->CreateInputEventBuffer( dfb, DICAPS_KEYS, DFB_FALSE, &events ); if (ret) { DirectFBError( "IDirectFB::CreateEventBuffer() failed", ret ); return -1; } //for (i = -dsc.width; i < screen_width; i++) myBitBlit(pic_x, pic_y); while (1){ ret = actionMonitor(); if(ret == -1){ break; } myBitBlit(3*pic_x, 3*pic_y); } exit_app(); return 0; }
