C++ (Cpp) de_fmtutil_uncompress_packbits примеры использования

Пример #1

static void do_read_bitmap(deark *c, lctx *d, de_int64 pos)
{
	de_int64 ver_num;
	dbuf *unc_pixels = NULL;

	ver_num = de_getui32be(pos);
	de_dbg(c, "version number: %u\n", (unsigned int)ver_num);
	if(ver_num!=0 && ver_num!=2 && ver_num!=3) {
		de_warn(c, "Unrecognized version number: %u\n", (unsigned int)ver_num);
	}

	pos += 512;

	unc_pixels = dbuf_create_membuf(c, MACPAINT_IMAGE_BYTES, 1);

	de_fmtutil_uncompress_packbits(c->infile, pos, c->infile->len - pos, unc_pixels, NULL);

	if(unc_pixels->len < MACPAINT_IMAGE_BYTES) {
		de_warn(c, "Image decompressed to %d bytes, expected %d.\n",
			(int)unc_pixels->len, (int)MACPAINT_IMAGE_BYTES);
	}

	de_convert_and_write_image_bilevel(unc_pixels, 0,
		MACPAINT_WIDTH, MACPAINT_HEIGHT, MACPAINT_WIDTH/8,
		DE_CVTF_WHITEISZERO, NULL, 0);

	dbuf_close(unc_pixels);
}

Пример #2

Файл: alphabmp.c Проект: jsummers/deark

static int do_uncompress_image(deark *c, lctx *d, i64 pos1, dbuf *unc_pixels)
{
	i64 bytes_in_this_line;
	i64 pos = pos1;
	i64 j;
	int ret;

	de_dbg(c, "decompressing bitmap");

	// Each line is compressed independently, using PackBits.

	for(j=0; j<d->h; j++) {
		bytes_in_this_line = de_getu16le(pos);
		pos += 2;
		ret = de_fmtutil_uncompress_packbits(c->infile, pos, bytes_in_this_line,
			unc_pixels, NULL);
		if(!ret) return 0;
		pos += bytes_in_this_line;
	}
	de_dbg(c, "decompressed %d bytes to %d bytes", (int)(pos-pos1),
		(int)unc_pixels->len);
	return 1;
}