好的——经过几次不成功的尝试，我终于从这个字节数组中得到了一些东西。我编写了这个简单的 C 程序来将字节数组转换为 Windows 位图文件。如果有人感兴趣，我将删除代码。
我针对 VisualC 6.0 和 gcc 3.4.4 编译了它，它应该可以在任何操作系统上运行（在 Windows、Linux 和 MacOS X 上测试）。
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
/* Types */
typedef unsigned char byte;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
typedef int int32_t;
/* Constants */
#define RMASK 0x00ff0000
#define GMASK 0x0000ff00
#define BMASK 0x000000ff
#define AMASK 0xff000000
/* Structures */
struct bmpfile_magic {
unsigned char magic[2];
};
struct bmpfile_header {
uint32_t filesz;
uint16_t creator1;
uint16_t creator2;
uint32_t bmp_offset;
};
struct bmpfile_dibheader {
uint32_t header_sz;
uint32_t width;
uint32_t height;
uint16_t nplanes;
uint16_t bitspp;
uint32_t compress_type;
uint32_t bmp_bytesz;
int32_t hres;
int32_t vres;
uint32_t ncolors;
uint32_t nimpcolors;
uint32_t rmask, gmask, bmask, amask;
uint32_t colorspace_type;
byte colorspace[0x24];
uint32_t rgamma, ggamma, bgamma;
};
/* Displays usage info and exits */
void usage(char *cmd) {
printf("Usage:\t%s <img_src> <img_dest.bmp> <width> <height>\n"
"\timg_src:\timage byte buffer obtained from Eclipse MAT, using 'copy > save value to file' while selecting the byte[] buffer corresponding to an android.graphics.Bitmap\n"
"\timg_dest:\tpath to target *.bmp file\n"
"\twidth:\t\tpicture width, obtained in Eclipse MAT, selecting the android.graphics.Bitmap object and seeing the object member values\n"
"\theight:\t\tpicture height\n\n", cmd);
exit(1);
}
/* C entry point */
int main(int argc, char **argv) {
FILE *in, *out;
char *file_in, *file_out;
int w, h, W, H;
byte r, g, b, a, *image;
struct bmpfile_magic magic;
struct bmpfile_header header;
struct bmpfile_dibheader dibheader;
/* Parse command line */
if (argc < 5) {
usage(argv[0]);
}
file_in = argv[1];
file_out = argv[2];
W = atoi(argv[3]);
H = atoi(argv[4]);
in = fopen(file_in, "rb");
out = fopen(file_out, "wb");
/* Check parameters */
if (in == NULL || out == NULL || W == 0 || H == 0) {
usage(argv[0]);
}
/* Init BMP headers */
magic.magic[0] = 'B';
magic.magic[1] = 'M';
header.filesz = W * H * 4 + sizeof(magic) + sizeof(header) + sizeof(dibheader);
header.creator1 = 0;
header.creator2 = 0;
header.bmp_offset = sizeof(magic) + sizeof(header) + sizeof(dibheader);
dibheader.header_sz = sizeof(dibheader);
dibheader.width = W;
dibheader.height = H;
dibheader.nplanes = 1;
dibheader.bitspp = 32;
dibheader.compress_type = 3;
dibheader.bmp_bytesz = W * H * 4;
dibheader.hres = 2835;
dibheader.vres = 2835;
dibheader.ncolors = 0;
dibheader.nimpcolors = 0;
dibheader.rmask = RMASK;
dibheader.gmask = BMASK;
dibheader.bmask = GMASK;
dibheader.amask = AMASK;
dibheader.colorspace_type = 0x57696e20;
memset(&dibheader.colorspace, 0, sizeof(dibheader.colorspace));
dibheader.rgamma = dibheader.bgamma = dibheader.ggamma = 0;
/* Read picture data */
image = (byte*) malloc(4*W*H);
if (image == NULL) {
printf("Could not allocate a %d-byte buffer.\n", 4*W*H);
exit(1);
}
fread(image, 4*W*H, sizeof(byte), in);
fclose(in);
/* Write header */
fwrite(&magic, sizeof(magic), 1, out);
fwrite(&header, sizeof(header), 1, out);
fwrite(&dibheader, sizeof(dibheader), 1, out);
/* Convert the byte array to BMP format */
for (h = H-1; h >= 0; h--) {
for (w = 0; w < W; w++) {
r = *(image + w*4 + 4 * W * h);
b = *(image + w*4 + 4 * W * h + 1);
g = *(image + w*4 + 4 * W * h + 2);
a = *(image + w*4 + 4 * W * h + 3);
fwrite(&b, 1, 1, out);
fwrite(&g, 1, 1, out);
fwrite(&r, 1, 1, out);
fwrite(&a, 1, 1, out);
}
}
free(image);
fclose(out);
}
所以使用这个工具我能够识别用于生成这个 1280x1920 位图的图片。
