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
|
/* Copyright (C) 2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
*/
#include "android/skin/scaler.h"
#include <stdint.h>
#include <math.h>
struct SkinScaler {
double scale;
double xdisp, ydisp;
double invscale;
int valid;
};
static SkinScaler _scaler0;
SkinScaler*
skin_scaler_create( void )
{
_scaler0.scale = 1.0;
_scaler0.xdisp = 0.0;
_scaler0.ydisp = 0.0;
_scaler0.invscale = 1.0;
return &_scaler0;
}
/* change the scale of a given scaler. returns 0 on success, or -1 in case of
* problem (unsupported scale) */
int
skin_scaler_set( SkinScaler* scaler, double scale, double xdisp, double ydisp )
{
/* right now, we only support scales in the 0.5 .. 1.0 range */
if (scale < 0.1)
scale = 0.1;
else if (scale > 6.0)
scale = 6.0;
scaler->scale = scale;
scaler->xdisp = xdisp;
scaler->ydisp = ydisp;
scaler->invscale = 1/scale;
scaler->valid = 1;
return 0;
}
void
skin_scaler_free( SkinScaler* scaler )
{
scaler=scaler;
}
typedef struct {
SDL_Rect rd; /* destination rectangle */
int sx, sy; /* source start position in 16.16 format */
int ix, iy; /* source increments in 16.16 format */
int src_pitch;
int src_w;
int src_h;
int dst_pitch;
uint8_t* dst_line;
uint8_t* src_line;
double scale;
} ScaleOp;
#define ARGB_SCALE_GENERIC scale_generic
#define ARGB_SCALE_05_TO_10 scale_05_to_10
#define ARGB_SCALE_UP_BILINEAR scale_up_bilinear
/* #define ARGB_SCALE_UP_QUICK_4x4 scale_up_quick_4x4 UNUSED */
#include "android/skin/argb.h"
void
skin_scaler_get_scaled_rect( SkinScaler* scaler,
SkinRect* srect,
SkinRect* drect )
{
int sx = srect->pos.x;
int sy = srect->pos.y;
int sw = srect->size.w;
int sh = srect->size.h;
double scale = scaler->scale;
if (!scaler->valid) {
drect[0] = srect[0];
return;
}
drect->pos.x = (int)(sx * scale + scaler->xdisp);
drect->pos.y = (int)(sy * scale + scaler->ydisp);
drect->size.w = (int)(ceil((sx + sw) * scale + scaler->xdisp)) - drect->pos.x;
drect->size.h = (int)(ceil((sy + sh) * scale + scaler->ydisp)) - drect->pos.y;
}
void
skin_scaler_scale( SkinScaler* scaler,
SDL_Surface* dst_surface,
SDL_Surface* src_surface,
int sx,
int sy,
int sw,
int sh )
{
ScaleOp op;
if ( !scaler->valid )
return;
SDL_LockSurface( src_surface );
SDL_LockSurface( dst_surface );
{
op.scale = scaler->scale;
op.src_pitch = src_surface->pitch;
op.src_line = src_surface->pixels;
op.src_w = src_surface->w;
op.src_h = src_surface->h;
op.dst_pitch = dst_surface->pitch;
op.dst_line = dst_surface->pixels;
/* compute the destination rectangle */
op.rd.x = (int)(sx * scaler->scale + scaler->xdisp);
op.rd.y = (int)(sy * scaler->scale + scaler->ydisp);
op.rd.w = (int)(ceil((sx + sw) * scaler->scale + scaler->xdisp)) - op.rd.x;
op.rd.h = (int)(ceil((sy + sh) * scaler->scale + scaler->ydisp)) - op.rd.y;
/* compute the starting source position in 16.16 format
* and the corresponding increments */
op.sx = (int)((op.rd.x - scaler->xdisp) * scaler->invscale * 65536);
op.sy = (int)((op.rd.y - scaler->ydisp) * scaler->invscale * 65536);
op.ix = (int)( scaler->invscale * 65536 );
op.iy = op.ix;
op.dst_line += op.rd.x*4 + op.rd.y*op.dst_pitch;
if (op.scale >= 0.5 && op.scale <= 1.0)
scale_05_to_10( &op );
else if (op.scale > 1.0)
scale_up_bilinear( &op );
else
scale_generic( &op );
}
SDL_UnlockSurface( dst_surface );
SDL_UnlockSurface( src_surface );
SDL_UpdateRects( dst_surface, 1, &op.rd );
}
|
