summaryrefslogtreecommitdiff
path: root/fitz/base_trans.c
blob: 92582253eb35b40a2c9a56510c00f8d4dd8f93a7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
#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_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);
		}
	}
	return 0;
}