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#include "mupdf/fitz.h"
static int
fade(fz_pixmap *tpix, fz_pixmap *opix, fz_pixmap *npix, int time)
{
unsigned char *t, *o, *n;
int size;
if (!tpix || !opix || !npix || tpix->w != opix->w || opix->w != npix->w || tpix->h != opix->h || opix->h != npix->h || tpix->n != opix->n || opix->n != npix->n)
return 0;
size = tpix->w * tpix->h * tpix->n;
t = tpix->samples;
o = opix->samples;
n = npix->samples;
while (size-- > 0)
{
int op = *o++;
int np = *n++;
*t++ = ((op<<8) + ((np-op) * time) + 0x80)>>8;
}
return 1;
}
static int
blind_horiz(fz_pixmap *tpix, fz_pixmap *opix, fz_pixmap *npix, int time)
{
unsigned char *t, *o, *n;
int blind_height, span, position, y;
if (!tpix || !opix || !npix || tpix->w != opix->w || opix->w != npix->w || tpix->h != opix->h || opix->h != npix->h || tpix->n != opix->n || opix->n != npix->n)
return 0;
span = tpix->w * tpix->n;
blind_height = (tpix->h+7) / 8;
position = blind_height * time / 256;
t = tpix->samples;
o = opix->samples;
n = npix->samples;
for (y = 0; y < tpix->h; y++)
{
memcpy(t, ((y % blind_height) <= position ? n : o), span);
t += span;
o += span;
n += span;
}
return 1;
}
static int
blind_vertical(fz_pixmap *tpix, fz_pixmap *opix, fz_pixmap *npix, int time)
{
unsigned char *t, *o, *n;
int blind_width, span, position, y;
if (!tpix || !opix || !npix || tpix->w != opix->w || opix->w != npix->w || tpix->h != opix->h || opix->h != npix->h || tpix->n != opix->n || opix->n != npix->n)
return 0;
span = tpix->w * tpix->n;
blind_width = (tpix->w+7) / 8;
position = blind_width * time / 256;
blind_width *= tpix->n;
position *= tpix->n;
t = tpix->samples;
o = opix->samples;
n = npix->samples;
for (y = 0; y < tpix->h; y++)
{
int w, x;
x = 0;
while ((w = span - x) > 0)
{
int p;
if (w > blind_width)
w = blind_width;
p = position;
if (p > w)
p = w;
memcpy(t, n, p);
memcpy(t+position, o+position, w - p);
x += blind_width;
t += w;
o += w;
n += w;
}
}
return 1;
}
static int
wipe_tb(fz_pixmap *tpix, fz_pixmap *opix, fz_pixmap *npix, int time)
{
unsigned char *t, *o, *n;
int span, position, y;
if (!tpix || !opix || !npix || tpix->w != opix->w || opix->w != npix->w || tpix->h != opix->h || opix->h != npix->h || tpix->n != opix->n || opix->n != npix->n)
return 0;
span = tpix->w * tpix->n;
position = tpix->h * time / 256;
t = tpix->samples;
o = opix->samples;
n = npix->samples;
for (y = 0; y < position; y++)
{
memcpy(t, n, span);
t += span;
o += span;
n += span;
}
for (; y < tpix->h; y++)
{
memcpy(t, o, span);
t += span;
o += span;
n += span;
}
return 1;
}
static int
wipe_lr(fz_pixmap *tpix, fz_pixmap *opix, fz_pixmap *npix, int time)
{
unsigned char *t, *o, *n;
int span, position, y;
if (!tpix || !opix || !npix || tpix->w != opix->w || opix->w != npix->w || tpix->h != opix->h || opix->h != npix->h || tpix->n != opix->n || opix->n != npix->n)
return 0;
span = tpix->w * tpix->n;
position = tpix->w * time / 256;
position *= tpix->n;
t = tpix->samples;
o = opix->samples + position;
n = npix->samples;
for (y = 0; y < tpix->h; y++)
{
memcpy(t, n, position);
memcpy(t+position, o, span-position);
t += span;
o += span;
n += span;
}
return 1;
}
int fz_generate_transition(fz_context *ctx, fz_pixmap *tpix, fz_pixmap *opix, fz_pixmap *npix, int time, fz_transition *trans)
{
switch (trans->type)
{
default:
case FZ_TRANSITION_FADE:
return fade(tpix, opix, npix, time);
case FZ_TRANSITION_BLINDS:
if (trans->vertical)
return blind_vertical(tpix, opix, npix, time);
else
return blind_horiz(tpix, opix, npix, time);
case FZ_TRANSITION_WIPE:
switch (((trans->direction + 45 + 360) % 360) / 90)
{
default:
case 0: return wipe_lr(tpix, opix, npix, time);
case 1: return wipe_tb(tpix, npix, opix, 256-time);
case 2: return wipe_lr(tpix, npix, opix, 256-time);
case 3: return wipe_tb(tpix, opix, npix, time);
}
}
}
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