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
|
/* bitmap.c
*
* Copyright (C) 2010 dking <dking024@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licens e 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
*/
//v1.1
#include "fs_api.h"
#include "bitmap.h"
int BMP_read(char* filename, char *buf, unsigned int width, unsigned int height, unsigned int* type)
{
FILE* fp;
BMPHEADER bmp_header;
int flag;
u32 bytepixel;
u32 x, y, sx, sy, m;
unsigned char *dest;
s32 fpos;
unsigned short st[54/2];
fp= fopen(filename, "rb");
if(fp == NULL)
return BMP_ERR_OPENFAILURE;
flag= fread(st, sizeof(st), 1, fp);
if(!flag) {
fclose(fp);
return BMP_ERR_FORMATE;
}
bmp_header.bfType= st[0];
bmp_header.bfSize= st[1] | (st[2]<<16);
bmp_header.bfReserved0= st[3];
bmp_header.bfReserved1= st[4];
bmp_header.bfImgoffst= st[5] | (st[6]<<16);
bmp_header.bfImghead.imHeadsize= st[7] | (st[8]<<16);
bmp_header.bfImghead.imBitmapW= st[9] | (st[10]<<16);
bmp_header.bfImghead.imBitmapH= st[11] | (st[12]<<16);
bmp_header.bfImghead.imPlanes= st[13];
bmp_header.bfImghead.imBitpixel= st[14];
bmp_header.bfImghead.imCompess= st[15] | (st[16]<<16);
bmp_header.bfImghead.imImgsize= st[17] | (st[18]<<16);
bmp_header.bfImghead.imHres= st[19] | (st[20]<<16);
bmp_header.bfImghead.imVres= st[21] | (st[22]<<16);
bmp_header.bfImghead.imColnum= st[23] | (st[24]<<16);
bmp_header.bfImghead.imImcolnum= st[25] | (st[26]<<16);
if(bmp_header.bfType != 0x4D42) //"BM"
return BMP_ERR_FORMATE;
if(bmp_header.bfImghead.imCompess != BI_RGB &&
bmp_header.bfImghead.imCompess != BI_BITFIELDS)
return BMP_ERR_NEED_GO_ON; //This funciton now not support...
bytepixel= bmp_header.bfImghead.imBitpixel >> 3;
if(bytepixel < 2) //byte per pixel >= 2
return BMP_ERR_NEED_GO_ON; //This funciton now not support...
*type = bytepixel;
x= width;
y= height;
sx= bmp_header.bfImghead.imBitmapW;
sy= bmp_header.bfImghead.imBitmapH;
if(x > sx)
x= sx;
if(y > sy)
y= sy;
//BMP scan from down to up
fpos= (s32)bmp_header.bfImgoffst;
dest= (unsigned char*)buf+(y-1)*x*bytepixel;
for(m= 0; m < y; m++) {
fseek(fp, fpos, SEEK_SET);
fread(dest, 1, x*bytepixel, fp);
fpos += ((sx*bytepixel+3)>>2)<<2;
dest -= x*bytepixel;
}
fclose(fp);
return BMP_OK;
}
/*
* open BMP file
*/
int openBMP(BMPINFO* bmpInfo, const char* file)
{
FILE* fp;
unsigned short st[54/2];
int len;
bmpInfo->fp = NULL;
fp = fopen(file, "r");
if(NULL == fp)
return BMP_ERR_OPENFAILURE;
len = fread((void*)st, 1, sizeof(BMPHEADER), fp);
if(len < sizeof(BMPHEADER)) {
fclose(fp);
return BMP_ERR_FORMATE;
}
bmpInfo->bmpHead.bfType= st[0];
bmpInfo->bmpHead.bfSize= st[1] | (st[2]<<16);
bmpInfo->bmpHead.bfReserved0= st[3];
bmpInfo->bmpHead.bfReserved1= st[4];
bmpInfo->bmpHead.bfImgoffst= st[5] | (st[6]<<16);
bmpInfo->bmpHead.bfImghead.imHeadsize= st[7] | (st[8]<<16);
bmpInfo->bmpHead.bfImghead.imBitmapW= st[9] | (st[10]<<16);
bmpInfo->bmpHead.bfImghead.imBitmapH= st[11] | (st[12]<<16);
bmpInfo->bmpHead.bfImghead.imPlanes= st[13];
bmpInfo->bmpHead.bfImghead.imBitpixel= st[14];
bmpInfo->bmpHead.bfImghead.imCompess= st[15] | (st[16]<<16);
bmpInfo->bmpHead.bfImghead.imImgsize= st[17] | (st[18]<<16);
bmpInfo->bmpHead.bfImghead.imHres= st[19] | (st[20]<<16);
bmpInfo->bmpHead.bfImghead.imVres= st[21] | (st[22]<<16);
bmpInfo->bmpHead.bfImghead.imColnum= st[23] | (st[24]<<16);
bmpInfo->bmpHead.bfImghead.imImcolnum= st[25] | (st[26]<<16);
if(bmpInfo->bmpHead.bfType != 0x4D42) //"BM"
{
fclose(fp);
return BMP_ERR_FORMATE;
}
if(bmpInfo->bmpHead.bfImghead.imCompess != BI_RGB &&
bmpInfo->bmpHead.bfImghead.imCompess != BI_BITFIELDS)
{
fclose(fp);
return BMP_ERR_NEED_GO_ON; //This funciton now not support...
}
bmpInfo->fp = fp;
return BMP_OK;
}
/*
* read pixel form BMP file
*/
int readBMP(BMPINFO* bmpInfo, unsigned int start_x, unsigned int start_y,
unsigned int width, unsigned int height, void* buffer)
{
unsigned int m, n;
unsigned int bmp_w, bmp_h;
int fpos;
unsigned char* dst;
unsigned int bytepixel;
bytepixel = bmpInfo->bmpHead.bfImghead.imBitpixel >> 3;
if(bytepixel < 2) //Not support <2 bytes per pixel now
return -1;
//BMP scan from down to up
bmp_w = bmpInfo->bmpHead.bfImghead.imBitmapW;
bmp_h = bmpInfo->bmpHead.bfImghead.imBitmapH;
if(((start_x +1) > bmp_w) || ((start_y+1) > bmp_h)) return -1;
n = bmp_w - start_x;
if(n > width) n = width; //start_x + width < bmp_w
m = bmp_h - start_y;
if(m > height) m = height; //start_y + height < bmp_h
fpos = (int)bmpInfo->bmpHead.bfImgoffst;
fpos += (((bmp_w*bytepixel+3)>>2)<<2)*(bmp_h - start_y -1) + start_x*bytepixel;
dst = (unsigned char*)buffer;
n *= bytepixel;
while(m--) {
fseek(bmpInfo->fp, fpos, SEEK_SET);
fread(dst, 1, n, bmpInfo->fp);
fpos -= ((bmp_w*bytepixel+3)>>2)<<2;
dst += width*bytepixel;
}
return 0;
}
/*
* close BMP file
*/
void closeBMP(BMPINFO* bmpInfo)
{
if(NULL != bmpInfo->fp)
fclose(bmpInfo->fp);
}
|
