void Bilinear(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
u8 *dstPtr, u32 dstPitch, int width, int height)
{
u16 *to = (u16 *)dstPtr;
u16 *to_odd = (u16 *)(dstPtr + dstPitch);
int from_width = width;
u16 *from = (u16 *)srcPtr;
fill_rgb_row_16(from, from_width, rgb_row_cur, width+1);
for(int y = 0; y < height; y++) {
u16 *from_orig = from;
u16 *to_orig = to;
if (y+1 < height)
fill_rgb_row_16(from+width+2, from_width, rgb_row_next,
width+1);
else
fill_rgb_row_16(from, from_width, rgb_row_next, width+1);
// every pixel in the src region, is extended to 4 pixels in the
// destination, arranged in a square 'quad'; if the current src
// pixel is 'a', then in what follows 'b' is the src pixel to the
// right, 'c' is the src pixel below, and 'd' is the src pixel to
// the right and down
u8 *cur_row = rgb_row_cur;
u8 *next_row = rgb_row_next;
u8 *ar = cur_row++;
u8 *ag = cur_row++;
u8 *ab = cur_row++;
u8 *cr = next_row++;
u8 *cg = next_row++;
u8 *cb = next_row++;
for(int x=0; x < width; x++) {
u8 *br = cur_row++;
u8 *bg = cur_row++;
u8 *bb = cur_row++;
u8 *dr = next_row++;
u8 *dg = next_row++;
u8 *db = next_row++;
// upper left pixel in quad: just copy it in
*to++ = RGB(*ar, *ag, *ab);
// upper right
*to++ = RGB((*ar+*br)>>1, (*ag+*bg)>>1, (*ab+*bb)>>1);
// lower left
*to_odd++ = RGB((*ar+*cr)>>1, (*ag+*cg)>>1, (*ab+*cb)>>1);
// lower right
*to_odd++ = RGB((*ar+*br+*cr+*dr)>>2,
(*ag+*bg+*cg+*dg)>>2,
(*ab+*bb+*cb+*db)>>2);
// 'b' becomes 'a', 'd' becomes 'c'
ar = br;
ag = bg;
ab = bb;
cr = dr;
cg = dg;
cb = db;
}
// the "next" rgb row becomes the current; the old current rgb row is
// recycled and serves as the new "next" row
u8 *temp;
temp = rgb_row_cur;
rgb_row_cur = rgb_row_next;
rgb_row_next = temp;
// update the pointers for start of next pair of lines
from = (u16 *)((u8 *)from_orig + srcPitch);
to = (u16 *)((u8 *)to_orig + (dstPitch << 1));
to_odd = (u16 *)((u8 *)to + dstPitch);
}
}
void BilinearPlus(u8 * srcPtr, u32 srcPitch, u8 * deltaPtr, u8 * dstPtr, u32 dstPitch, int width, int height) {
int x, y, from_width = width + 1;
u8 *temp = NULL;
u16 *to = (u16 *) dstPtr;
u16 *to_odd = (u16 *) (dstPtr + dstPitch);
u16 *from = (u16 *) srcPtr;
fill_rgb_row_16(from, from_width, rgb_row_cur, width);
for(y = 0; y < height; y++) {
u16 *from_orig = from;
u16 *to_orig = to;
u8 *cur_row = NULL;
u8 *next_row = NULL;
u8 *ar = NULL;
u8 *ag = NULL;
u8 *ab = NULL;
u8 *cr = NULL;
u8 *cg = NULL;
u8 *cb = NULL;
fill_rgb_row_16(from, from_width, rgb_row_next, width);
// every pixel in the src region, is extended to 4 pixels in the
// destination, arranged in a square 'quad'; if the current src
// pixel is 'a', then in what follows 'b' is the src pixel to the
// right, 'c' is the src pixel below, and 'd' is the src pixel to
// the right and down
cur_row = rgb_row_cur;
next_row = rgb_row_next;
ar = cur_row++;
ag = cur_row++;
ab = cur_row++;
cr = next_row++;
cg = next_row++;
cb = next_row++;
for(x = 0; x < width; x++) {
u8 *br = cur_row++;
u8 *bg = cur_row++;
u8 *bb = cur_row++;
u8 *dr = next_row++;
u8 *dg = next_row++;
u8 *db = next_row++;
// upper left pixel in quad: just copy it in
//*to++ = manip.rgb(*ar, *ag, *ab);
#ifdef USE_ORIGINAL_BILINEAR_PLUS
*to++ = RGB((((*ar) << 2) + ((*ar)) + (*cr + *br + *br)) >> 3,
(((*ag) << 2) + ((*ag)) + (*cg + *bg + *bg)) >> 3,
(((*ab) << 2) + ((*ab)) + (*cb + *bb + *bb)) >> 3);
#else
*to++ = RGB((((*ar) << 3) + ((*ar) << 1) + (*cr + *br + *br + *cr)) >> 4,
(((*ag) << 3) + ((*ag) << 1) + (*cg + *bg + *bg + *cg)) >> 4,
(((*ab) << 3) + ((*ab) << 1) + (*cb + *bb + *bb + *cb)) >> 4);
#endif
// upper right
*to++ = RGB((*ar + *br) >> 1, (*ag + *bg) >> 1, (*ab + *bb) >> 1);
// lower left
*to_odd++ = RGB((*ar + *cr) >> 1, (*ag + *cg) >> 1, (*ab + *cb) >> 1);
// lower right
*to_odd++ =
RGB((*ar + *br + *cr + *dr) >> 2, (*ag + *bg + *cg + *dg) >> 2,
(*ab + *bb + *cb + *db) >> 2);
// 'b' becomes 'a', 'd' becomes 'c'
ar = br;
ag = bg;
ab = bb;
cr = dr;
cg = dg;
cb = db;
}
// the "next" rgb row becomes the current; the old current rgb row is
// recycled and serves as the new "next" row
temp = rgb_row_cur;
rgb_row_cur = rgb_row_next;
rgb_row_next = temp;
// update the pointers for start of next pair of lines
from = (u16 *) ((u8 *) from_orig + srcPitch);
to = (u16 *) ((u8 *) to_orig + (dstPitch << 1));
to_odd = (u16 *) ((u8 *) to + dstPitch);
}
}