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comparison src/filters/scanline.cpp @ 1:f9f4f1b99eed

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importing src directory
author Robert McIntyre <rlm@mit.edu>
date Sat, 03 Mar 2012 10:31:27 -0600
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0:8ced16adf2e1 1:f9f4f1b99eed
1 #include "../Port.h"
2
3 extern u32 RGB_LOW_BITS_MASK;
4
5 void Scanlines(u8 *srcPtr, u32 srcPitch, u8 *,
6 u8 *dstPtr, u32 dstPitch, int width, int height)
7 {
8 u8 *nextLine, *finish;
9
10 nextLine = dstPtr + dstPitch;
11
12 do
13 {
14 u32 *bP = (u32 *) srcPtr;
15 u32 *dP = (u32 *) dstPtr;
16 u32 *nL = (u32 *) nextLine;
17 u32 currentPixel;
18 u32 nextPixel;
19
20 finish = (u8 *) bP + ((width + 2) << 1);
21 nextPixel = *bP++;
22
23 do
24 {
25 currentPixel = nextPixel;
26 nextPixel = *bP++;
27 u32 colorA, colorB;
28
29 #ifdef WORDS_BIGENDIAN
30 colorA = currentPixel >> 16;
31 colorB = currentPixel & 0xffff;
32 #else
33 colorA = currentPixel & 0xffff;
34 colorB = currentPixel >> 16;
35 #endif
36
37 *(dP) = colorA | colorA << 16;
38 *(nL) = 0;
39
40 #ifdef WORDS_BIGENDIAN
41 colorA = nextPixel >> 16;
42 #else
43 colorA = nextPixel & 0xffff;
44 #endif
45
46 *(dP + 1) = colorB | (colorB << 16);
47 *(nL + 1) = 0;
48
49 dP += 2;
50 nL += 2;
51 }
52 while ((u8 *) bP < finish);
53
54 srcPtr += srcPitch;
55 dstPtr += dstPitch << 1;
56 nextLine += dstPitch << 1;
57 }
58 while (--height);
59 }
60
61 void Scanlines32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
62 u8 *dstPtr, u32 dstPitch, int width, int height)
63 {
64 u8 *nextLine, *finish;
65
66 nextLine = dstPtr + dstPitch;
67
68 do
69 {
70 u32 *bP = (u32 *) srcPtr;
71 u32 *dP = (u32 *) dstPtr;
72 u32 *nL = (u32 *) nextLine;
73 u32 currentPixel;
74 u32 nextPixel;
75
76 finish = (u8 *) bP + ((width + 1) << 2);
77 nextPixel = *bP++;
78
79 do
80 {
81 currentPixel = nextPixel;
82 nextPixel = *bP++;
83
84 u32 colorA, colorB;
85
86 colorA = currentPixel;
87 colorB = nextPixel;
88
89 *(dP) = colorA;
90 *(dP + 1) = colorA;
91 *(nL) = 0;
92 *(nL + 1) = 0;
93
94 *(dP + 2) = colorB;
95 *(dP + 3) = colorB;
96 *(nL + 2) = 0;
97 *(nL + 3) = 0;
98
99 nextPixel = *bP++;
100
101 dP += 4;
102 nL += 4;
103 }
104 while ((u8 *) bP < finish);
105
106 srcPtr += srcPitch;
107 dstPtr += dstPitch << 1;
108 nextLine += dstPitch << 1;
109 }
110 while (--height);
111 }
112
113 void ScanlinesTV(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
114 u8 *dstPtr, u32 dstPitch, int width, int height)
115 {
116 u8 *nextLine, *finish;
117 u32 colorMask = ~(RGB_LOW_BITS_MASK | (RGB_LOW_BITS_MASK << 16));
118
119 nextLine = dstPtr + dstPitch;
120
121 do
122 {
123 u32 *bP = (u32 *) srcPtr;
124 u32 *dP = (u32 *) dstPtr;
125 u32 *nL = (u32 *) nextLine;
126 u32 currentPixel;
127 u32 nextPixel;
128
129 finish = (u8 *) bP + ((width + 2) << 1);
130 nextPixel = *bP++;
131
132 do
133 {
134 currentPixel = nextPixel;
135 nextPixel = *bP++;
136
137 u32 colorA, colorB;
138
139 #ifdef WORDS_BIGENDIAN
140 colorA = currentPixel >> 16;
141 colorB = currentPixel & 0xFFFF;
142 #else
143 colorA = currentPixel & 0xFFFF;
144 colorB = currentPixel >> 16;
145 #endif
146
147 *(dP) = colorA = colorA | ((((colorA & colorMask) >> 1) +
148 ((colorB & colorMask) >> 1))) << 16;
149 colorA = ((colorA & colorMask) >> 1);
150 colorA += ((colorA & colorMask) >> 1);
151 *(nL) = colorA;
152
153 colorA = nextPixel & 0xFFFF;
154
155 *(dP + 1) = colorB = colorB | ((((colorA & colorMask) >> 1) +
156 ((colorB & colorMask) >> 1))) << 16;
157 colorB = ((colorB & colorMask) >> 1);
158 colorB += ((colorB & colorMask) >> 1);
159
160 *(nL + 1) = colorB;
161
162 dP += 2;
163 nL += 2;
164 }
165 while ((u8 *) bP < finish);
166
167 srcPtr += srcPitch;
168 dstPtr += dstPitch << 1;
169 nextLine += dstPitch << 1;
170 }
171 while (--height);
172 }
173
174 void ScanlinesTV32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
175 u8 *dstPtr, u32 dstPitch, int width, int height)
176 {
177 u8 *nextLine, *finish;
178 u32 colorMask = ~RGB_LOW_BITS_MASK;
179
180 nextLine = dstPtr + dstPitch;
181
182 do
183 {
184 u32 *bP = (u32 *) srcPtr;
185 u32 *dP = (u32 *) dstPtr;
186 u32 *nL = (u32 *) nextLine;
187 u32 currentPixel;
188 u32 nextPixel;
189
190 finish = (u8 *) bP + ((width + 1) << 2);
191 nextPixel = *bP++;
192
193 do
194 {
195 currentPixel = nextPixel;
196 nextPixel = *bP++;
197
198 u32 colorA, colorB, temp;
199
200 colorA = currentPixel;
201 colorB = nextPixel;
202
203 *(dP) = colorA;
204 *(dP + 1) = temp = ((colorA & colorMask) >> 1) +
205 ((colorB & colorMask) >> 1);
206 temp = ((temp & colorMask) >> 1);
207 temp += ((temp & colorMask) >> 1);
208 colorA = ((colorA & colorMask) >> 1);
209 colorA += ((colorA & colorMask) >> 1);
210
211 *(nL) = colorA;
212 *(nL + 1) = temp;
213
214 dP += 2;
215 nL += 2;
216 }
217 while ((u8 *) bP < finish);
218
219 srcPtr += srcPitch;
220 dstPtr += dstPitch << 1;
221 nextLine += dstPitch << 1;
222 }
223 while (--height);
224 }
225