DirectFB 之 实例图像不断右移

/********************************************** * Author: [e-mail] * File name: imgrotate.c * Description: animation * Modified: *   date:   2014-01-06  create *********************************************/#include <directfb.h>#include "animation.h"#define MAX_LOOP        2#define INTERVAL_PIXEL   2#define EYE_HZ          50#define INTERVAL_TIME   (1000 / EYE_HZ)static int animation(int argc, char **argv);int main(int argc, char **argv){    return  animation(argc, argv);}static int animation(int argc, char **argv){    int i, loop = 0;    int screen_width = 0, screen_height = 0;    DFBSurfaceDescription dsc;    /*     * For collecting infomation of image,     * and provide image to IDirectFBSurface     */    IDirectFBImageProvider *provider;    IDirectFB *dfb = NULL;    IDirectFBSurface *primary = NULL;    IDirectFBSurface *logo = NULL;    /* 初始化整个DirectFB库，为后续画图等操作做准备 */    DirectFBInit(&argc, &argv);    DirectFBCreate(&dfb);        /* 设置协作等级为全屏模式,具体请阅读SetCooperativeLevel接口解析 */    dfb->SetCooperativeLevel(dfb, DFSCL_FULLSCREEN);    dsc.flags = DSDESC_CAPS;    dsc.caps = DSCAPS_PRIMARY | DSCAPS_FLIPPING;    /* 根据dsc创建一个基本平面 */    dfb->CreateSurface(dfb, &dsc, &primary);    /* 获取该基本平面的宽度和高度 */    primary->GetSize(primary, &screen_width, &screen_height);    /* 将要显示的图片及其相关信息保存在provider中 */    dfb->CreateImageProvider(dfb, BA_IMG_NAME, &provider);    /* 将保存在provider中的图片信息提取出来，存于dsc中 */    provider->GetSurfaceDescription(provider, &dsc);    /* 根据dsc创建一个图像平面 */    dfb->CreateSurface(dfb, &dsc, &logo);    /* 将图片呈递给刚才建立的logo平面，如果大小不一，则进行缩放 */    provider->RenderTo(provider, logo, NULL);    /* 释放资源provider */    provider->Release(provider);    for (i = -dsc.width;            i < screen_width && !ba_check_exit(shared_mem);            i = i + INTERVAL_PIXEL) {        /* 清空屏幕 */        primary->FillRectangle(primary, 0, 0,                    screen_width, screen_height);        primary->Blit(primary, logo, NULL, i,                    (screen_height - dsc.height) / 2);        /*         * Blit model:将图片blit到平面         * Blit(IDirectFBSurface *thiz, IDirectFBSurface *source,         *          const DFBRectangle *source_rect, int x, int y);         * if source_rect == NULL，use entire surface.         * DFBRctangle is rectangular frame defined by two points.         * (x, y):the point of top left corner.         */        /* flit整个屏幕 */        primary->Flip(primary, NULL, DSFLIP_WAITFORSYNC);        msleep(INTERVAL_TIME);        if ((screen_width - INTERVAL_PIXEL) <= i && loop < MAX_LOOP) {            BA_LOG(1, "screen_width:%d, loop:%d.\n", screen_width, loop);            loop++;            i = -dsc.width;        }    }    logo->Release(logo);    primary->Release(primary);    dfb->Release(dfb);    return 0;}