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
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*/
#include "graphics/conversion.h"
namespace Graphics {
// TODO: YUV to RGB conversion function
// Function to blit a rect from one color format to another
bool crossBlit(byte *dst, const byte *src, int dstpitch, int srcpitch,
int w, int h, const Graphics::PixelFormat &dstFmt, const Graphics::PixelFormat &srcFmt) {
// Error out if conversion is impossible
if ((srcFmt.bytesPerPixel == 1) || (dstFmt.bytesPerPixel == 1)
|| (!srcFmt.bytesPerPixel) || (!dstFmt.bytesPerPixel)
|| (srcFmt.bytesPerPixel > dstFmt.bytesPerPixel))
return false;
// Don't perform unnecessary conversion
if (srcFmt == dstFmt) {
if (dst == src)
return true;
if (dstpitch == srcpitch && ((w * dstFmt.bytesPerPixel) == dstpitch)) {
memcpy(dst,src,dstpitch * h);
return true;
} else {
for (int i = 0; i < h; i++) {
memcpy(dst,src,w * dstFmt.bytesPerPixel);
dst += dstpitch;
src += srcpitch;
}
return true;
}
}
// Faster, but larger, to provide optimized handling for each case.
int srcDelta, dstDelta;
srcDelta = (srcpitch - w * srcFmt.bytesPerPixel);
dstDelta = (dstpitch - w * dstFmt.bytesPerPixel);
// TODO: optimized cases for dstDelta of 0
uint8 r, g, b, a;
if (dstFmt.bytesPerPixel == 2) {
uint16 color;
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 2, dst += 2) {
color = *(uint16 *) src;
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
*(uint16 *) dst = color;
}
src += srcDelta;
dst += dstDelta;
}
} else if (dstFmt.bytesPerPixel == 3) {
uint32 color;
uint8 *col = (uint8 *) &color;
#ifdef SCUMM_BIG_ENDIAN
col++;
#endif
if (srcFmt.bytesPerPixel == 2) {
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 2, dst += 3) {
color = *(uint16 *) src;
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
memcpy(dst, col, 3);
}
src += srcDelta;
dst += dstDelta;
}
} else {
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 3, dst += 3) {
memcpy(col, src, 3);
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
memcpy(dst, col, 3);
}
src += srcDelta;
dst += dstDelta;
}
}
} else if (dstFmt.bytesPerPixel == 4) {
uint32 color;
if (srcFmt.bytesPerPixel == 2) {
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 2, dst += 4) {
color = *(uint16 *) src;
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
*(uint32 *) dst = color;
}
src += srcDelta;
dst += dstDelta;
}
} else if (srcFmt.bytesPerPixel == 3) {
uint8 *col = (uint8 *)&color;
#ifdef SCUMM_BIG_ENDIAN
col++;
#endif
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 2, dst += 4) {
memcpy(col, src, 3);
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
*(uint32 *) dst = color;
}
src += srcDelta;
dst += dstDelta;
}
} else {
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 4, dst += 4) {
color = *(uint32 *) src;
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
*(uint32 *) dst = color;
}
src += srcDelta;
dst += dstDelta;
}
}
} else {
return false;
}
return true;
}
} // end of namespace Graphics
|
