-
Notifications
You must be signed in to change notification settings - Fork 0
/
rotation64.c
212 lines (188 loc) · 5.01 KB
/
rotation64.c
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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
extern void copyLines(unsigned char* copywritePtr, unsigned char* readPtr, int rem, int imageHeight, int lineBytes);
#pragma pack(push, 1)
typedef struct
{
uint16_t bfType;
uint32_t bfSize;
uint16_t bfReserved1;
uint16_t bfReserved2;
uint32_t bfOffBits;
uint32_t biSize;
int32_t biWidth;
int32_t biHeight;
int16_t biPlanes;
int16_t biBitCount;
uint32_t biCompression;
uint32_t biSizeImage;
int32_t biXPelsPerMeter;
int32_t biYPelsPerMeter;
uint32_t biClrUsed;
uint32_t biClrImportant;
uint32_t RGBQuad_0;
uint32_t RGBQuad_1;
} bmpHdr;
#pragma pack(pop)
typedef struct
{
unsigned char *pImg;
int width;
int height;
} imgInfo;
void* freeResources(FILE* pFile, void* pFirst, void* pSnd)
{
if (pFile != 0)
fclose(pFile);
if (pFirst != 0)
free(pFirst);
if (pSnd !=0)
free(pSnd);
return 0;
}
imgInfo* readBMP(const char* fname)
{
imgInfo* pInfo = 0;
FILE* fbmp = 0;
bmpHdr bmpHead;
int lineBytes, y;
unsigned long imageSize = 0;
unsigned char* ptr;
pInfo = 0;
fbmp = fopen(fname, "rb");
if (fbmp == 0)
{
printf("error in opening file\n");
return 0;
}
fread((void *) &bmpHead, sizeof(bmpHead), 1, fbmp);
// some basic checks
if (bmpHead.bfType != 0x4D42 || bmpHead.biPlanes != 1 ||
bmpHead.biBitCount != 1 ||
(pInfo = (imgInfo *) malloc(sizeof(imgInfo))) == 0)
{
printf("error in basic checks\n");
return (imgInfo*) freeResources(fbmp, pInfo->pImg, pInfo);
}
pInfo->width = bmpHead.biWidth;
pInfo->height = bmpHead.biHeight;
imageSize = (((pInfo->width + 31) >> 5) << 2) * pInfo->height;
if ((pInfo->pImg = (unsigned char*) malloc(imageSize)) == 0)
{
printf("error in allocation\n");
return (imgInfo*) freeResources(fbmp, pInfo->pImg, pInfo);
}
// process height (it can be negative)
ptr = pInfo->pImg;
lineBytes = ((pInfo->width + 31) >> 5) << 2; // line size in bytes
if (pInfo->height > 0)
{
// "upside down", bottom of the image first
ptr += lineBytes * (pInfo->height - 1);
lineBytes = -lineBytes;
}
else
pInfo->height = -pInfo->height;
// reading image
// moving to the proper position in the file
if (fseek(fbmp, bmpHead.bfOffBits, SEEK_SET) != 0)
{
printf("error in moving to the beggining of data\n");
return (imgInfo*) freeResources(fbmp, pInfo->pImg, pInfo);
}
for (y=0; y<pInfo->height; ++y)
{
fread(ptr, 1, abs(lineBytes), fbmp);
ptr += lineBytes;
}
fclose(fbmp);
return pInfo;
}
unsigned char* allocateMem(const imgInfo* pInfo)
{
int colBytes = ((pInfo->height + 31) >> 5) << 2;
unsigned char* memory = (unsigned char*) malloc(colBytes * pInfo->width);
return memory;
}
void rotate(const imgInfo* pInfo, unsigned char *writePtr)
{
int lineBytes = ((pInfo->width + 31) >> 5) << 2;
int colBytes = ((pInfo->height + 31) >> 5) << 2;
unsigned char *readPtr;
unsigned char *copywritePtr = writePtr;
int rem;
int readBytesCol = 0;
int imageHeight = pInfo->height;
int w = 0;
while (w < pInfo->width)
{
readPtr = pInfo->pImg + lineBytes * (pInfo->height - 1);
copywritePtr = writePtr + (w * colBytes);
readPtr += readBytesCol;
rem = (w % 8);
copyLines(copywritePtr, readPtr, rem, imageHeight, lineBytes);
w++;
if ((w % 8) == 0)
{
readBytesCol++;
}
}
}
int saveBMP(const imgInfo* pInfo, const char* fname, unsigned char *writePtr)
{
int lineBytes = ((pInfo->width + 31) >> 5)<<2;
int colBytes = ((pInfo->height + 31) >> 5) << 2;
bmpHdr bmpHead =
{
0x4D42, // unsigned short bfType;
sizeof(bmpHdr), // unsigned long bfSize;
0, 0, // unsigned short bfReserved1, bfReserved2;
sizeof(bmpHdr), // unsigned long bfOffBits;
40, // unsigned long biSize;
pInfo->height, // long biWidth;
pInfo->width, // long biHeight;
1, // short biPlanes;
1, // short biBitCount;
0, // unsigned long biCompression;
colBytes* pInfo->width, // unsigned long biSizeImage;
11811, // long biXPelsPerMeter; = 300 dpi
11811, // long biYPelsPerMeter;
2, // unsigned long biClrUsed;
0, // unsigned long biClrImportant;
0x00000000, // unsigned long RGBQuad_0;
0x00FFFFFF // unsigned long RGBQuad_1;
};
FILE * fbmp;
unsigned char *ptr;
int y;
if ((fbmp = fopen(fname, "wb")) == 0)
{
printf("error in opening file");
return -1;
}
if (fwrite(&bmpHead, sizeof(bmpHdr), 1, fbmp) != 1)
{
fclose(fbmp);
return -2;
}
ptr = writePtr + colBytes * (pInfo->width - 1);
for (y = (pInfo->width); y > 0; --y, ptr -= colBytes)
if (fwrite(ptr, sizeof(unsigned char), colBytes, fbmp) != colBytes)
{
fclose(fbmp);
return -3;
}
fclose(fbmp);
return 0;
}
int main(int argc, char* argv[])
{
imgInfo* pInfo;
pInfo = readBMP("kitty.bmp"); // Set name of source file
unsigned char* memoryOut = allocateMem(pInfo);
rotate(pInfo, memoryOut);
saveBMP(pInfo, "out.bmp", memoryOut); // Set name of destination file
return 0;
}