/*
zoom()
Resizes bitmaps while resampling them.
Returns -1 if error, 0 if success.
*/
int zoom( ILimage *dst, ILimage *src, double (*filterf)(double), double fwidth) {
ILubyte* tmp;
double xscale, yscale; /* zoom scale factors */
int xx;
int i, j, k; /* loop variables */
int n; /* pixel number */
double center, left, right; /* filter calculation variables */
double width, fscale, weight; /* filter calculation variables */
ILubyte pel, pel2;
int bPelDelta;
CLIST *contribY; /* array of contribution lists */
CLIST contribX;
int nRet = -1;
/* create intermediate column to hold horizontal dst column zoom */
tmp = (ILubyte*)ialloc(src->Height * sizeof(ILubyte));
if (tmp == NULL) {
return 0;
}
xscale = (double) dst->Width / (double) src->Width;
/* Build y weights */
/* pre-calculate filter contributions for a column */
contribY = (CLIST*)icalloc(dst->Height, sizeof(CLIST));
if (contribY == NULL) {
ifree(tmp);
return -1;
}
yscale = (double) dst->Height / (double) src->Height;
if(yscale < 1.0)
{
width = fwidth / yscale;
fscale = 1.0 / yscale;
for(i = 0; i < (ILint)dst->Height; ++i)
{
contribY[i].n = 0;
contribY[i].p = (CONTRIB*)icalloc((int) (width * 2 + 1),
sizeof(CONTRIB));
if(contribY[i].p == NULL) {
ifree(tmp);
ifree(contribY);
return -1;
}
center = (double) i / yscale;
left = ceil(center - width);
right = floor(center + width);
for(j = (int)left; j <= right; ++j) {
weight = center - (double) j;
weight = (*filterf)(weight / fscale) / fscale;
n = wrap_filter_sample(j, src->Height);
k = contribY[i].n++;
contribY[i].p[k].pixel = n;
contribY[i].p[k].weight = weight;
}
}
} else {
for(i = 0; i < (ILint)dst->Height; ++i) {
contribY[i].n = 0;
contribY[i].p = (CONTRIB*)icalloc((int) (fwidth * 2 + 1),
sizeof(CONTRIB));
if (contribY[i].p == NULL) {
ifree(tmp);
ifree(contribY);
return -1;
}
center = (double) i / yscale;
left = ceil(center - fwidth);
right = floor(center + fwidth);
for(j = (int)left; j <= right; ++j) {
weight = center - (double) j;
weight = (*filterf)(weight);
n = wrap_filter_sample(j, src->Height);
k = contribY[i].n++;
contribY[i].p[k].pixel = n;
contribY[i].p[k].weight = weight;
}
}
}
for(xx = 0; xx < (ILint)dst->Width; xx++)
{
if(0 != calc_x_contrib(&contribX, xscale, fwidth,
dst->Width, src->Width, filterf, xx))
{
goto __zoom_cleanup;
}
/* Apply horz filter to make dst column in tmp. */
for(k = 0; k < (ILint)src->Height; ++k)
{
weight = 0.0;
bPelDelta = IL_FALSE;
// Denton: Put get_pixel source here
//pel = get_pixel(src, contribX.p[0].pixel, k);
pel = src->Data[k * src->Bps + contribX.p[0].pixel * src->Bpp + c];
for(j = 0; j < contribX.n; ++j)
{
// Denton: Put get_pixel source here
//pel2 = get_pixel(src, contribX.p[j].pixel, k);
pel2 = src->Data[k * src->Bps + contribX.p[j].pixel * src->Bpp + c];
if(pel2 != pel)
bPelDelta = IL_TRUE;
weight += pel2 * contribX.p[j].weight;
}
weight = bPelDelta ? roundcloser(weight) : pel;
tmp[k] = (ILubyte)CLAMP(weight, BLACK_PIXEL, WHITE_PIXEL);
} /* next row in temp column */
ifree(contribX.p);
/* The temp column has been built. Now stretch it
vertically into dst column. */
for(i = 0; i < (ILint)dst->Height; ++i)
{
weight = 0.0;
bPelDelta = IL_FALSE;
pel = tmp[contribY[i].p[0].pixel];
for(j = 0; j < contribY[i].n; ++j)
{
pel2 = tmp[contribY[i].p[j].pixel];
if(pel2 != pel)
bPelDelta = IL_TRUE;
weight += pel2 * contribY[i].p[j].weight;
}
weight = bPelDelta ? roundcloser(weight) : pel;
// Denton: Put set_pixel source here
//put_pixel(dst, xx, i, (ILubyte)CLAMP(weight, BLACK_PIXEL, WHITE_PIXEL));
dst->Data[i * dst->Bps + xx * dst->Bpp + c] =
(ILubyte)CLAMP(weight, BLACK_PIXEL, WHITE_PIXEL);
} /* next dst row */
} /* next dst column */
nRet = 0; /* success */
__zoom_cleanup:
ifree(tmp);
// Free the memory allocated for vertical filter weights
for (i = 0; i < (ILint)dst->Height; ++i)
ifree(contribY[i].p);
ifree(contribY);
return nRet;
} /* zoom */
//---------------------------------------------------------------------------
static int ib_resample(tTVPBaseBitmap *dst,
const tTVPRect &destrect,
const tTVPBaseBitmap *src,
const tTVPRect &srcrect,
real_t (*filterf)(real_t),
// void (*blend)(tjs_uint32 *dest, tjs_uint32 src),
real_t fwidth)
{
pixel_t * tmp;
real_t xscale, yscale; /* zoom scale factors */
int xx;
int i, j, k; /* loop variables */
int n; /* pixel number */
real_t center, left, right; /* filter calculation variables */
real_t width, fscale; /* filter calculation variables */
pixel_real_t_t weight;
pixel_t pel, pel2;
pixel_t bPelDelta;
CLIST *contribY; /* array of contribution lists */
CLIST contribX;
int nRet = -1;
int srcwidth = srcrect.get_width();
int srcheight = srcrect.get_height();
int destwidth = destrect.get_width();
int destheight = destrect.get_height();
/* create intermediate column to hold horizontal dst column zoom */
tmp = (pixel_t*)malloc(srcheight * sizeof(pixel_t));
if(tmp == NULL)
return 0;
xscale = (real_t) destwidth / (real_t) srcwidth;
/* Build y weights */
/* pre-calculate filter contributions for a column */
contribY = (CLIST *)calloc(destheight, sizeof(CLIST));
if(contribY == NULL)
{
free(tmp);
return -1;
}
yscale = (real_t) destheight / (real_t) srcheight;
if(yscale < 1.0)
{
real_t weight;
width = fwidth / yscale;
fscale = static_cast<real_t>(1.0 / yscale);
for(i = 0; i < destheight; ++i)
{
real_t w_sum = 0;
contribY[i].n = 0;
contribY[i].p = (CONTRIB *)calloc((int) (width * 2 + 1),
sizeof(CONTRIB));
if(contribY[i].p == NULL)
{
free(tmp);
free(contribY);
return -1;
}
center = (real_t) i * fscale;
left = ceil(center - width);
right = floor(center + width);
for(j = (int)left; j <= right; ++j)
{
weight = center - (real_t) j;
weight = (*filterf)(weight * yscale); //* yscale;
w_sum += weight;
if(j < 0)
{
n = -j;
}
else if(j >= srcheight)
{
n = (srcheight - j) + srcheight - 1;
}
else
{
n = j;
}
if(n < 0) n = 0;
if(n >= srcheight - 1) n = srcheight - 1;
k = contribY[i].n++;
contribY[i].p[k].pixel = n;
contribY[i].p[k].weight = weight;
}
if(w_sum != 0.0)
{
w_sum = static_cast<real_t>(1.0 / w_sum);
for(j = 0; j < contribY[i].n; j ++)
contribY[i].p[j].weight *= w_sum;
}
}
}
else
{
real_t weight;
for(i = 0; i < destheight; ++i)
{
contribY[i].n = 0;
contribY[i].p = (CONTRIB *)calloc((int) (fwidth * 2 + 1),
sizeof(CONTRIB));
if(contribY[i].p == NULL)
{
free(tmp);
free(contribY);
return -1;
}
center = (real_t) i / yscale;
left = ceil(center - fwidth);
right = floor(center + fwidth);
for(j = (int)left; j <= right; ++j)
{
weight = center - (real_t) j;
weight = (*filterf)(weight);
if(j < 0)
{
n = -j;
}
else if(j >= srcheight)
{
n = (srcheight - j) + srcheight - 1;
}
else
{
n = j;
}
if(n < 0) n = 0;
if(n >= srcheight - 1) n = srcheight - 1;
k = contribY[i].n++;
contribY[i].p[k].pixel = n;
contribY[i].p[k].weight = weight;
}
}
}
const pixel_t *srclinestart = (const pixel_t*)src->GetScanLine(srcrect.top) +
srcrect.left;
tjs_int srcpitchbytes = src->GetPitchBytes();
pixel_t *destlinestart = (pixel_t*)dst->GetScanLineForWrite(destrect.top) +
destrect.left;
tjs_int destpitchbytes = dst->GetPitchBytes();
for(xx = 0; xx < destwidth; xx++)
{
if(0 != calc_x_contrib(&contribX, xscale, fwidth,
destwidth, srcwidth, filterf, xx))
{
goto __zoom_cleanup;
}
/* Apply horz filter to make dst column in tmp. */
{
const pixel_t *line = srclinestart;
for(k = 0; k < srcheight; ++k)
{
weight.r = weight.g = weight.b = weight.a = 0;
bPelDelta.r = bPelDelta.g = bPelDelta.b = bPelDelta.a = FALSE;
pel = line[contribX.p[0].pixel];
for(j = contribX.n - 1; j >= 0; --j)
{
CONTRIB *c = contribX.p + j;
pel2 = line[c->pixel];
bPelDelta.r |= (pel2.r - pel.r);
bPelDelta.b |= (pel2.b - pel.b);
bPelDelta.g |= (pel2.g - pel.g);
bPelDelta.a |= (pel2.a - pel.a);
weight.r += pel2.r * c->weight;
weight.g += pel2.g * c->weight;
weight.b += pel2.b * c->weight;
weight.a += pel2.a * c->weight;
}
weight.r = static_cast<real_t>(bPelDelta.r ? roundcloser(weight.r) : pel.r);
weight.g = static_cast<real_t>(bPelDelta.g ? roundcloser(weight.g) : pel.g);
weight.b = static_cast<real_t>(bPelDelta.b ? roundcloser(weight.b) : pel.b);
weight.a = static_cast<real_t>(bPelDelta.a ? roundcloser(weight.a) : pel.a);
tmp[k].r = (unsigned char)CLAMP(static_cast<int>(weight.r), 0, 255);
tmp[k].g = (unsigned char)CLAMP(static_cast<int>(weight.g), 0, 255);
tmp[k].b = (unsigned char)CLAMP(static_cast<int>(weight.b), 0, 255);
tmp[k].a = (unsigned char)CLAMP(static_cast<int>(weight.a), 0, 255);
//(tjs_uint8*)(line) += srcpitchbytes;
const tjs_uint8* b = reinterpret_cast<const tjs_uint8*>(line);
b += srcpitchbytes;
line = reinterpret_cast<const pixel_t*>(b);
} /* next row in temp column */
}
free(contribX.p);
/* The temp column has been built. Now stretch it
vertically into dst column. */
{
pixel_t *line = destlinestart;
for(i = 0; i < destheight; ++i)
{
CLIST *cl = contribY + i;
weight.r = weight.g = weight.b = weight.a = 0;
bPelDelta.r = bPelDelta.g = bPelDelta.b = bPelDelta.a = FALSE;
pel = tmp[cl->p[0].pixel];
for(j = cl->n - 1; j >= 0; --j)
{
CONTRIB *c = cl->p + j;
pel2 = tmp[c->pixel];
bPelDelta.r |= (pel2.r - pel.r);
bPelDelta.b |= (pel2.b - pel.b);
bPelDelta.g |= (pel2.g - pel.g);
bPelDelta.a |= (pel2.a - pel.a);
weight.r += pel2.r * c->weight;
weight.g += pel2.g * c->weight;
weight.b += pel2.b * c->weight;
weight.a += pel2.a * c->weight;
}
weight.r = static_cast<real_t>(bPelDelta.r ? roundcloser(weight.r) : pel.r);
weight.g = static_cast<real_t>(bPelDelta.g ? roundcloser(weight.g) : pel.g);
weight.b = static_cast<real_t>(bPelDelta.b ? roundcloser(weight.b) : pel.b);
weight.a = static_cast<real_t>(bPelDelta.a ? roundcloser(weight.a) : pel.a);
line[xx].r = (unsigned char)CLAMP(static_cast<int>(weight.r), 0, 255);
line[xx].g = (unsigned char)CLAMP(static_cast<int>(weight.g), 0, 255);
line[xx].b = (unsigned char)CLAMP(static_cast<int>(weight.b), 0, 255);
line[xx].a = (unsigned char)CLAMP(static_cast<int>(weight.a), 0, 255);
const tjs_uint8* b = reinterpret_cast<const tjs_uint8*>(line);
b += destpitchbytes;
line = const_cast<pixel_t*>(reinterpret_cast<const pixel_t*>(b));
//(const tjs_uint8*)(line) += destpitchbytes;
} /* next dst row */
}
} /* next dst column */
nRet = 0; /* success */
__zoom_cleanup:
free(tmp);
/* free the memory allocated for vertical filter weights */
for(i = 0; i < destheight; ++i)
free(contribY[i].p);
free(contribY);
return nRet;
} /* ib_resample */
