Hello devels
I have managed to create my gfx driver and i am now at the stage where i
experiment with the blit function. I want to implement the blit with
alpha channel blend algorithm. My test code so far is:
bool sciensis_blit(
void *drv_data,
void *dev_data,
DFBRectangle *rect,
i32 dx,
i32 dy
)
{
u32 *dst, *src;
u32 i, j;
sciensis_drv_data *scdrv = (sciensis_drv_data *) drv_data;
sciensis_dev_data *scdev = (sciensis_dev_data *) dev_data;
/* Software blit/blend implementation */
dst = scdev->dst_addr + dy * scdev->dst_pitch;
dst += DFB_BYTES_PER_LINE(scdev->dst_fmt, dx);
src = scdev->src_addr + rect->y * scdev->src_pitch;
src += DFB_BYTES_PER_LINE(scdev->src_fmt, rect->x);
while (rect->h--) {
direct_memcpy(dst, src, rect->w * scdev->dst_bpp);
dst += scdev->dst_pitch;
src += scdev->src_pitch;
}
return true;
}
This works fine. But when i replace direct_memcpy with memcpy or any
other way of manipulating surface data i get segfaults. That makes me
understand that the surface data buffers are not linear but have some
other format or data structure. I have seen some of the surface struct
declaration code but i can't resolve this. This must be easy for you.
Can you help?
Best regards
Tasos Parisinos at sciensis dot com
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