QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
Transparent .gif Images for Buttons |
| Ref. No. |
QNX.000009777 |
| Category(ies) |
Development |
| Issue |
I am attempting to create a button that has a transparent gif image. The idea is that the button would be over a bitmap and the bitmap would show through the transparent part of the button.
Is this possible with PhAB?
|
| Solution |
Yes, it is possible. Put your image under the button into shared memory. Try to match the pallete of your image with the palette that you use in Photon.
Then make your button with transparent fill color and a border width of 0.
Here is a sample example on putting the button background image into shared memory:
#define PX_IMAGE_MODULES
#define PX_JPG_SUPPORT
#include <photon/PxImage.h>
void *memory_allocate(long nbytes, int type)
{
x09return(PgShmemCreate(nbytes, NULL));
}
void memory_free(void *memory, int type)
{
x09PgShmemDestroy(memory);
}
int base_setup(PtWidget_t *link_instance, ApInfo_t *apinfo, PtCallbackInfo_t *cbinfo)
{
x09int i = 0;
x09char *fname ="/tmp/slaunch_bkgd.jpg";
x09PtArg_t arg[2];
x09PhImage_t *img;
x09PxMethods_t methods;
x09/*eliminate 'unreferenced' warnings*/
x09link_instance = link_instance, apinfo = apinfo, cbinfo =cbinfo;
x09memset(&methods, 0, sizeof(PxMethods_t));
x09methods.px_alloc = memory allocate;
x09methods.px_free = memory_free;
x09methods.flags |= PX_LOAD;
x09if(((img = PxLoadImage(fname, &methods))== NULL)
x09{
x09x09fprintf(stderr, "error loading %sn", fname);
x09x09exit(EXIT_FAILURE);
x09}
x09PtSetArg(&arg[0], Pt_ARG_BKGD_IMAGE, img, sizeof(PhImage_t));
x09PtSetResources(ABW_bkgd1, 1, arg);
x09return(Pt_CONTINUE);
}
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