/** \brief Rotate a canvas.
*
* Apply a 180-degree transformation to a canvas, choosing characters
* that look like the upside-down version wherever possible. Some
* characters will stay unchanged by the process, but the operation is
* guaranteed to be involutive: performing it again gives back the
* original canvas.
*
* This function never fails.
*
* \param cv The canvas to rotate.
* \return This function always returns 0.
*/
int caca_rotate_180(caca_canvas_t *cv)
{
uint32_t *cbegin = cv->chars;
uint32_t *cend = cbegin + cv->width * cv->height - 1;
uint32_t *abegin = cv->attrs;
uint32_t *aend = abegin + cv->width * cv->height - 1;
int y;
if(!cbegin)
return 0;
while(cbegin < cend)
{
uint32_t ch;
uint32_t attr;
/* Swap attributes */
attr = *aend; *aend = *abegin; *abegin = attr;
/* Swap characters */
ch = *cend; *cend = rotatechar(*cbegin); *cbegin = rotatechar(ch);
cbegin++; cend--; abegin++; aend--;
}
if(cbegin == cend)
*cbegin = rotatechar(*cbegin);
/* Fix fullwidth characters. Could it be done in one loop? */
for(y = 0; y < cv->height; y++)
{
cbegin = cv->chars + y * cv->width;
cend = cbegin + cv->width - 1;
for( ; cbegin < cend; cbegin++)
{
if(cbegin[0] == CACA_MAGIC_FULLWIDTH)
{
cbegin[0] = cbegin[1];
cbegin[1] = CACA_MAGIC_FULLWIDTH;
cbegin++;
}
}
}
if(!cv->dirty_disabled)
caca_add_dirty_rect(cv, 0, 0, cv->width, cv->height);
return 0;
}
void OsdSetTitle(char *s,int a)
{
// Compose the title, condensing character gaps
arrow=a;
char zeros=0;
char i=0,j=0;
char outp=0;
while(1)
{
int c=s[i++];
if(c && (outp<64))
{
unsigned char *p = &charfont[c][0];
for(j=0;j<8;++j)
{
unsigned char nc=*p++;
if(nc)
{
zeros=0;
titlebuffer[outp++]=nc;
}
else if(zeros==0)
{
titlebuffer[outp++]=0;
zeros=1;
}
if(outp>63)
break;
}
}
else
break;
}
for(i=outp;i<64;++i)
{
titlebuffer[i]=0;
}
// Now centre it:
int c=(63-outp)/2;
for(i=(63-c);i>=0;--i)
{
titlebuffer[i+c]=titlebuffer[i];
}
for(i=0;i<c;++i)
titlebuffer[i]=0;
// Finally rotate it.
for(i=0;i<64;i+=8)
{
unsigned char tmp[8];
rotatechar(&titlebuffer[i],tmp);
for(c=0;c<8;++c)
{
titlebuffer[i+c]=tmp[c];
}
}
}
