Subject:
Re: [nanogui] regarding banner lagging
From:
Michael Bogaerts ####@####.####
Date:
6 Feb 2006 10:42:40 +0000
Message-Id: <1139222272.7920.16.camel@ENGLINUX.tokheim.com>
Hi,
as far as i can see you keep onloading the images all the time.
what i would do i create an offscreen pixmap for each image(keeping it
in memory) and copy it onto the screen when required. the copying
doesn't not take that much time. i beleive that the image loading is
causing the lag
Regards
Michael
On Mon, 2006-02-06 at 00:36 -0800, sai baba wrote:
> hi ,
> i have implemented banner with u r idea of 2
> offscreen buffers .Now i have lagging problem with the
> banner application when i am loading the buffer with
> the below given loop.
>
> Here is the buffer fill up routine i implemented(for
> scrolling the bmp image from left to right).
>
>
>
> GR_IMAGE_ID image_id;
> GR_IMAGE_INFO info;
> GR_IMAGE_ID p;
> int x;//for showing how much buffer filled when the
> image is completed
> if ( fileptr > nofiles ) //fileptr for keeping track
> of the bmp file name
> fileptr = 0 ; //if it ends start from first
>
>
> if ( partial == 1 ) { //partial for image is loaded
> partial into buffer or full
> if ( fileptr > nofiles )
> fileptr = 0 ;
> image_id = GrLoadImageFromFile(filenames [
> fileptr ] ,0);
> GrGetImageInfo(image_id, &info);
> p = GrNewPixmap(info.width,h,0);
> if ( width >= w ) {
>
> if ( width == w ) { //w,h are the width and
> height of the banner window in nanox
> partial = 0;
> fileptr ++;
> }
> GrDrawImageToFit( p , gc,0,0,info.width,h,
> image_id);// image to be scaled to h
> GrCopyArea(offscreen, gc, 0,0,w,h,
> p,width-w,0,MWROP_SRCCOPY);
> width -= w;
> GrDestroyWindow(p);
> GrFreeImage(image_id);
> return;
> }
> else {
> GrDrawImageToFit( p , gc,0,0,info.width,h,
> image_id);
> GrCopyArea(offscreen, gc,w-width ,0,width,h,
> p,0,0,MWROP_SRCCOPY);
>
> GrFreeImage(image_id);
> x = width ;
> fileptr ++;
> partial = 0 ;
> width = 0;
> GrDestroyWindow(p); // new code on 02/02
>
> while ( x <= w ) {
> if ( fileptr > nofiles )
> fileptr = 0 ;
> image_id = GrLoadImageFromFile(filenames [
> fileptr ] ,0);
> // GrDrawImageToFit( p ,
> gc,0,0,info.width,h, image_id);
> GrGetImageInfo(image_id, &info);
> p=GrNewPixmap(info.width,h,0); // new
> code on 02/02
>
> GrDrawImageToFit(p,gc,0,0,info.width,h,image_id);
>
> if (info.width >= ( w - x ) ) {
> GrCopyArea(offscreen, gc,0 ,0, w - x ,h,
> p,info.width-(w-x),0,MWROP_SRCCOPY);
> if ( info.width > ( w - x ) ) {
> partial = 1;
> width = info.width - (w - x) ;
> }
> else
> fileptr ++;
>
> GrDestroyWindow(p);
> GrFreeImage(image_id);
> return;
> }
> else {
>
> GrCopyArea(offscreen, gc,w-(x+info.width)
> ,0,info.width,h, p,0,0,MWROP_SRCCOPY);
> GrFreeImage(image_id);
> x += info.width;
> fileptr ++;
> GrDestroyWindow(p);
> }
> }
> }
> }
> else if ( partial == 0 ) {
>
> if ( fileptr > nofiles )
> fileptr = 0 ;
> image_id = GrLoadImageFromFile(filenames [
> fileptr ] ,0);
> GrGetImageInfo(image_id, &info);
> p = GrNewPixmap(info.width,h,0);
> if (info.width >= w ) {
>
> if ( info.width > w ) {
> partial = 1;
> width = info.width - w;
> }
> else
> fileptr++;
>
> GrDrawImageToFit( p , gc,0,0,info.width,h,
> image_id);// image to be scaled to h
> GrCopyArea(offscreen, gc, 0,0,w,h,
> p,width,0,MWROP_SRCCOPY);
> GrDestroyWindow(p);
> GrFreeImage(image_id);
> return;
> }
> else {
> GrDrawImageToFit( p , gc,0,0,info.width,h,
> image_id);
> GrCopyArea(offscreen, gc,w-info.width
> ,0,info.width ,h, p,0,0,MWROP_SRCCOPY);
> GrFreeImage(image_id);
> x = info.width ;
> fileptr ++;
> GrDestroyWindow(p); // new code on 02/02
>
> while ( x <= w ) {
> if ( fileptr > nofiles )
> fileptr = 0 ;
> image_id = GrLoadImageFromFile(filenames [
> fileptr ] ,0);
> //GrDrawImageToFit( p ,
> gc,0,0,info.width,h, image_id);
> GrGetImageInfo(image_id, &info);
> p=GrNewPixmap(info.width,h,0); // new code
> on 02/02
> GrDrawImageToFit(p , gc , 0 , 0
> ,info.width,h,image_id);
>
> if (info.width >= ( w - x ) ) {
> GrCopyArea(offscreen, gc,0 ,0, w - x ,h,
> p,info.width-(w-x),0,MWROP_SRCCOPY);
> if ( info.width > ( w - x ) ) {
> partial = 1;
> width = info.width - ( w - x ) ;
> }
> else
> fileptr++;
> GrDestroyWindow(p);
> GrFreeImage(image_id);
> return;
> }
> else {
>
> GrCopyArea(offscreen, gc,w-(x+info.width)
> ,0, info.width,h, p,0,0,MWROP_SRCCOPY);
> GrFreeImage(image_id);
> x += info.width;
> fileptr ++;
> GrDestroyWindow(p);
> }
> }
> }
> }
> }
>
>
>
> Is there any other way of implementing this with some
> less processing .
>
> Thanking you
>
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