blob: 0d54efda46d29b9c19a6e8755678be2194ca787c [file] [log] [blame]
Wayne Xia5042ca52011-07-08 11:02:09 +08001/*
2* Basic BMP data process and Raw picture data handle functions.
3* Could be used to adjust pixel data format, get infomation, etc.
4*
5* Copyright (C) 2011 Wayne Xia <xiawenc@cn.ibm.com>
6*
7* This work is licensed under the terms of the GNU LGPLv3.
8*/
9#include "util.h"
10#include "bmp.h"
11
12#define bmp_load4byte(addr) (*(u32 *)(addr))
13#define bmp_load2byte(addr) (*(u16 *)(addr))
14
15typedef struct tagBITMAPFILEHEADER {
16 u8 bfType[2];
17 u8 bfSize[4];
18 u8 bfReserved1[2];
19 u8 bfReserved2[2];
20 u8 bfOffBits[4];
21} BITMAPFILEHEADER, tagBITMAPFILEHEADER;
22
23typedef struct tagBITMAPINFOHEADER {
24 u8 biSize[4];
25 u8 biWidth[4];
26 u8 biHeight[4];
27 u8 biPlanes[2];
28 u8 biBitCount[2];
29 u8 biCompression[4];
30 u8 biSizeImage[4];
31 u8 biXPelsPerMeter[4];
32 u8 biYPelsPerMeter[4];
33 u8 biClrUsed[4];
34 u8 biClrImportant[4];
35} BITMAPINFOHEADER, tagBITMAPINFOHEADER;
36
37typedef struct tagRGBQUAD {
38 u8 rgbBlue;
39 u8 rgbGreen;
40 u8 rgbRed;
41 u8 rgbReserved;
42} RGBQUAD, tagRGBQUAD;
43
44/* flat picture data adjusting function
45* description:
46* switch the vertical line sequence
47* arrange horizontal pixel data, add extra space in the dest buffer
48* for every line
49*/
50static void raw_data_format_adjust_24bpp(u8 *src, u8 *dest, int width,
51 int height, int bytes_per_line_dest)
52{
53 int bytes_per_line_src = 3 * width;
54 int i;
55 for (i = 0 ; i < height ; i++) {
56 memcpy(dest + i * bytes_per_line_dest,
57 src + (height - 1 - i) * bytes_per_line_src, bytes_per_line_src);
58 }
59}
60
61struct bmp_decdata *bmp_alloc(void)
62{
63 struct bmp_decdata *bmp = malloc_tmphigh(sizeof(*bmp));
64 return bmp;
65}
66
67int bmp_decode(struct bmp_decdata *bmp, unsigned char *data, int data_size)
68{
69 if (data_size < 54)
70 return 1;
71
72 u16 bmp_filehead = bmp_load2byte(data + 0);
73 if (bmp_filehead != 0x4d42)
74 return 2;
75 u32 bmp_recordsize = bmp_load4byte(data + 2);
76 if (bmp_recordsize != data_size)
77 return 3;
78 u32 bmp_dataoffset = bmp_load4byte(data + 10);
79 bmp->datap = (unsigned char *)data + bmp_dataoffset;
80 bmp->width = bmp_load4byte(data + 18);
81 bmp->height = bmp_load4byte(data + 22);
82 bmp->bpp = bmp_load2byte(data + 28);
83 return 0;
84}
85
86void bmp_get_size(struct bmp_decdata *bmp, int *width, int *height)
87{
88 *width = bmp->width;
89 *height = bmp->height;
90}
91
92
93int bmp_show(struct bmp_decdata *bmp, unsigned char *pic, int width
94 , int height, int depth, int bytes_per_line_dest)
95{
96 if (bmp->datap == pic)
97 return 0;
98 /* now only support 24bpp bmp file */
99 if ((depth == 24) && (bmp->bpp == 24)) {
100 raw_data_format_adjust_24bpp(bmp->datap, pic, width, height,
101 bytes_per_line_dest);
102 return 0;
103 }
104 return 1;
105}