| Wayne Xia | 5042ca5 | 2011-07-08 11:02:09 +0800 | [diff] [blame^] | 1 | /* |
| 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 | |
| 15 | typedef 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 | |
| 23 | typedef 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 | |
| 37 | typedef 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 | */ |
| 50 | static 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 | |
| 61 | struct bmp_decdata *bmp_alloc(void) |
| 62 | { |
| 63 | struct bmp_decdata *bmp = malloc_tmphigh(sizeof(*bmp)); |
| 64 | return bmp; |
| 65 | } |
| 66 | |
| 67 | int 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 | |
| 86 | void bmp_get_size(struct bmp_decdata *bmp, int *width, int *height) |
| 87 | { |
| 88 | *width = bmp->width; |
| 89 | *height = bmp->height; |
| 90 | } |
| 91 | |
| 92 | |
| 93 | int 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 | } |