9 static unsigned short work_buf[WIDTH * HEIGHT];
11 static int writepng(const char *fname, const unsigned short *src)
13 png_structp png_ptr = NULL;
14 png_infop info_ptr = NULL;
15 png_bytepp row_pointers;
19 f = fopen(fname, "wb");
21 printf(__FILE__ ": failed to open \"%s\"\n", fname);
25 row_pointers = calloc(HEIGHT, sizeof(row_pointers[0]));
26 if (row_pointers == NULL)
29 for (i = 0; i < HEIGHT; i++) {
30 unsigned char *dst = malloc(WIDTH * 3);
33 row_pointers[i] = dst;
34 for (j = 0; j < WIDTH; j++, src++, dst += 3) {
35 unsigned short v = (*src >> 8) | (*src << 8);
36 dst[0] = (v & 0x7c00) >> 7;
37 dst[1] = (v & 0x03e0) >> 2;
38 dst[2] = (v & 0x001f) << 3;
42 /* initialize stuff */
43 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
44 if (png_ptr == NULL) {
45 fprintf(stderr, "png_create_write_struct() failed");
49 info_ptr = png_create_info_struct(png_ptr);
50 if (info_ptr == NULL) {
51 fprintf(stderr, "png_create_info_struct() failed");
55 if (setjmp(png_jmpbuf(png_ptr)) != 0) {
56 fprintf(stderr, "error in png code\n");
60 png_init_io(png_ptr, f);
62 png_set_IHDR(png_ptr, info_ptr, WIDTH, HEIGHT,
63 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
64 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
66 png_write_info(png_ptr, info_ptr);
67 png_write_image(png_ptr, row_pointers);
68 png_write_end(png_ptr, NULL);
73 // png_destroy_info_struct(png_ptr, &info_ptr); // freed below
75 png_destroy_write_struct(&png_ptr, &info_ptr);
77 for (i = 0; i < HEIGHT; i++)
78 free(row_pointers[i]);
85 int main(int argc, char *argv[])
90 printf("usage:\n%s <fb_dump> <png>\n", argv[0]);
94 f = fopen(argv[1], "rb");
96 perror("fopen fb_dump");
100 if (fread(work_buf, 1, sizeof(work_buf), f) != sizeof(work_buf))
101 printf("read error?\n");
103 writepng(argv[2], work_buf);