コード例 #1
0
ファイル: pnm_dec.c プロジェクト: rdrago/LCSource
jas_image_t *pnm_decode(jas_stream_t *in, char *opts)
{
    pnm_hdr_t hdr;
    jas_image_t *image;
    jas_image_cmptparm_t cmptparms[3];
    jas_image_cmptparm_t *cmptparm;
    int i;

    if (opts) {
        jas_eprintf("warning: ignoring options\n");
    }

    /* Read the file header. */
    if (pnm_gethdr(in, &hdr)) {
        return 0;
    }

    /* Create an image of the correct size. */
    for (i = 0, cmptparm = cmptparms; i < hdr.numcmpts; ++i, ++cmptparm) {
        cmptparm->tlx = 0;
        cmptparm->tly = 0;
        cmptparm->hstep = 1;
        cmptparm->vstep = 1;
        cmptparm->width = hdr.width;
        cmptparm->height = hdr.height;
        cmptparm->prec = pnm_maxvaltodepth(hdr.maxval);
        cmptparm->sgnd = hdr.sgnd;
    }
    if (!(image = jas_image_create(hdr.numcmpts, cmptparms, JAS_CLRSPC_UNKNOWN))) {
        return 0;
    }

    if (hdr.numcmpts == 3) {
        jas_image_setclrspc(image, JAS_CLRSPC_SRGB);
        jas_image_setcmpttype(image, 0,
                              JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_R));
        jas_image_setcmpttype(image, 1,
                              JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_G));
        jas_image_setcmpttype(image, 2,
                              JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_B));
    } else {
        jas_image_setclrspc(image, JAS_CLRSPC_SGRAY);
        jas_image_setcmpttype(image, 0,
                              JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_GRAY_Y));
    }

    /* Read image data from stream into image. */
    if (pnm_getdata(in, &hdr, image)) {
        jas_image_destroy(image);
        return 0;
    }

    return image;
}
コード例 #2
0
ファイル: pnm_dec.c プロジェクト: rdrago/LCSource
static int pnm_getdata(jas_stream_t *in, pnm_hdr_t *hdr, jas_image_t *image)
{
    int ret;
#if 0
    int numcmpts;
#endif
    int cmptno;
    int fmt;
    jas_matrix_t *data[3];
    int x;
    int y;
    int_fast64_t v;
    int depth;
    int type;
    int c;
    int n;

    ret = -1;

#if 0
    numcmpts = jas_image_numcmpts(image);
#endif
    fmt = pnm_fmt(hdr->magic);
    type = pnm_type(hdr->magic);
    depth = pnm_maxvaltodepth(hdr->maxval);

    data[0] = 0;
    data[1] = 0;
    data[2] = 0;
    for (cmptno = 0; cmptno < hdr->numcmpts; ++cmptno) {
        if (!(data[cmptno] = jas_matrix_create(1, hdr->width))) {
            goto done;
        }
    }

    for (y = 0; y < hdr->height; ++y) {
        if (type == PNM_TYPE_PBM) {
            if (fmt == PNM_FMT_BIN) {
                for (x = 0; x < hdr->width;) {
                    if ((c = jas_stream_getc(in)) == EOF) {
                        goto done;
                    }
                    n = 8;
                    while (n > 0 && x < hdr->width) {
                        jas_matrix_set(data[0], 0, x, 1 - ((c >> 7) & 1));
                        c <<= 1;
                        --n;
                        ++x;
                    }
                }
            } else {
                for (x = 0; x < hdr->width; ++x) {
                    int uv;
                    if (pnm_getbitstr(in, &uv)) {
                        goto done;
                    }
                    jas_matrix_set(data[0], 0, x, 1 - uv);
                }
            }
        } else {
            for (x = 0; x < hdr->width; ++x) {
コード例 #3
0
ファイル: pnm_dec.c プロジェクト: ImageMagick/jp2
jas_image_t *pnm_decode(jas_stream_t *in, const char *optstr)
{
	pnm_hdr_t hdr;
	jas_image_t *image;
	jas_image_cmptparm_t cmptparms[3];
	jas_image_cmptparm_t *cmptparm;
	int i;
	pnm_dec_importopts_t opts;
	size_t num_samples;

	image = 0;

	JAS_DBGLOG(10, ("pnm_decode(%p, \"%s\")\n", in, optstr ? optstr : ""));

	if (pnm_dec_parseopts(optstr, &opts)) {
		goto error;
	}

	/* Read the file header. */
	if (pnm_gethdr(in, &hdr)) {
		goto error;
	}
	JAS_DBGLOG(10, (
	  "magic %lx; width %lu; height %ld; numcmpts %d; maxval %ld; sgnd %d\n",
	  JAS_CAST(unsigned long, hdr.magic), JAS_CAST(long, hdr.width),
	  JAS_CAST(long, hdr.height), hdr.numcmpts, JAS_CAST(long, hdr.maxval),
	  hdr.sgnd)
	  );

	if (!jas_safe_size_mul3(hdr.width, hdr.height, hdr.numcmpts,
	  &num_samples)) {
		jas_eprintf("image too large\n");
		goto error;
	}
	if (opts.max_samples > 0 && num_samples > opts.max_samples) {
		jas_eprintf(
		  "maximum number of samples would be exceeded (%zu > %zu)\n",
		  num_samples, opts.max_samples);
		goto error;
	}

	/* Create an image of the correct size. */
	for (i = 0, cmptparm = cmptparms; i < hdr.numcmpts; ++i, ++cmptparm) {
		cmptparm->tlx = 0;
		cmptparm->tly = 0;
		cmptparm->hstep = 1;
		cmptparm->vstep = 1;
		cmptparm->width = hdr.width;
		cmptparm->height = hdr.height;
		cmptparm->prec = pnm_maxvaltodepth(hdr.maxval);
		cmptparm->sgnd = hdr.sgnd;
	}
	if (!(image = jas_image_create(hdr.numcmpts, cmptparms,
	  JAS_CLRSPC_UNKNOWN))) {
		goto error;
	}

	if (hdr.numcmpts == 3) {
		jas_image_setclrspc(image, JAS_CLRSPC_SRGB);
		jas_image_setcmpttype(image, 0,
		  JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_R));
		jas_image_setcmpttype(image, 1,
		  JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_G));
		jas_image_setcmpttype(image, 2,
		  JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_B));
	} else {
		jas_image_setclrspc(image, JAS_CLRSPC_SGRAY);
		jas_image_setcmpttype(image, 0,
		  JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_GRAY_Y));
	}

	/* Read image data from stream into image. */
	if (pnm_getdata(in, &hdr, image, opts.allow_trunc)) {
		goto error;
	}

	return image;

error:
	if (image) {
		jas_image_destroy(image);
	}
	return 0;
}