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#include "fitz.h"
#include "mupdf.h"
/* TODO: store JPEG compressed samples */
/* TODO: store flate compressed samples */
static fz_pixmap *pdf_load_jpx_image(pdf_document *xref, fz_obj *dict);
static void
pdf_mask_color_key(fz_pixmap *pix, int n, int *colorkey)
{
unsigned char *p = pix->samples;
int len = pix->w * pix->h;
int k, t;
while (len--)
{
t = 1;
for (k = 0; k < n; k++)
if (p[k] < colorkey[k * 2] || p[k] > colorkey[k * 2 + 1])
t = 0;
if (t)
for (k = 0; k < pix->n; k++)
p[k] = 0;
p += pix->n;
}
}
static fz_pixmap *
pdf_load_image_imp(pdf_document *xref, fz_obj *rdb, fz_obj *dict, fz_stream *cstm, int forcemask)
{
fz_stream *stm = NULL;
fz_pixmap *tile = NULL;
fz_obj *obj, *res;
int w, h, bpc, n;
int imagemask;
int interpolate;
int indexed;
fz_colorspace *colorspace = NULL;
fz_pixmap *mask = NULL; /* explicit mask/softmask image */
int usecolorkey;
int colorkey[FZ_MAX_COLORS * 2];
float decode[FZ_MAX_COLORS * 2];
int stride;
unsigned char *samples = NULL;
int i, len;
fz_context *ctx = xref->ctx;
fz_var(stm);
fz_var(tile);
fz_var(colorspace);
fz_var(mask);
fz_var(samples);
fz_try(ctx)
{
/* special case for JPEG2000 images */
if (pdf_is_jpx_image(ctx, dict))
{
tile = pdf_load_jpx_image(xref, dict);
/* RJW: "cannot load jpx image" */
if (forcemask)
{
if (tile->n != 2)
fz_throw(ctx, "softmask must be grayscale");
mask = fz_alpha_from_gray(ctx, tile, 1);
fz_drop_pixmap(ctx, tile);
tile = mask;
mask = NULL;
}
break; /* Out of fz_try */
}
w = fz_to_int(fz_dict_getsa(dict, "Width", "W"));
h = fz_to_int(fz_dict_getsa(dict, "Height", "H"));
bpc = fz_to_int(fz_dict_getsa(dict, "BitsPerComponent", "BPC"));
imagemask = fz_to_bool(fz_dict_getsa(dict, "ImageMask", "IM"));
interpolate = fz_to_bool(fz_dict_getsa(dict, "Interpolate", "I"));
indexed = 0;
usecolorkey = 0;
mask = NULL;
if (imagemask)
bpc = 1;
if (w == 0)
fz_throw(ctx, "image width is zero");
if (h == 0)
fz_throw(ctx, "image height is zero");
if (bpc == 0)
fz_throw(ctx, "image depth is zero");
if (bpc > 16)
fz_throw(ctx, "image depth is too large: %d", bpc);
if (w > (1 << 16))
fz_throw(ctx, "image is too wide");
if (h > (1 << 16))
fz_throw(ctx, "image is too high");
obj = fz_dict_getsa(dict, "ColorSpace", "CS");
if (obj && !imagemask && !forcemask)
{
/* colorspace resource lookup is only done for inline images */
if (fz_is_name(obj))
{
res = fz_dict_get(fz_dict_gets(rdb, "ColorSpace"), obj);
if (res)
obj = res;
}
colorspace = pdf_load_colorspace(xref, obj);
/* RJW: "cannot load image colorspace" */
if (!strcmp(colorspace->name, "Indexed"))
indexed = 1;
n = colorspace->n;
}
else
{
n = 1;
}
obj = fz_dict_getsa(dict, "Decode", "D");
if (obj)
{
for (i = 0; i < n * 2; i++)
decode[i] = fz_to_real(fz_array_get(obj, i));
}
else
{
float maxval = indexed ? (1 << bpc) - 1 : 1;
for (i = 0; i < n * 2; i++)
decode[i] = i & 1 ? maxval : 0;
}
obj = fz_dict_getsa(dict, "SMask", "Mask");
if (fz_is_dict(obj))
{
/* Not allowed for inline images */
if (!cstm)
{
mask = pdf_load_image_imp(xref, rdb, obj, NULL, 1);
/* RJW: "cannot load image mask/softmask" */
}
}
else if (fz_is_array(obj))
{
usecolorkey = 1;
for (i = 0; i < n * 2; i++)
{
if (!fz_is_int(fz_array_get(obj, i)))
{
fz_warn(ctx, "invalid value in color key mask");
usecolorkey = 0;
}
colorkey[i] = fz_to_int(fz_array_get(obj, i));
}
}
/* Allocate now, to fail early if we run out of memory */
fz_try(ctx)
{
tile = fz_new_pixmap(ctx, colorspace, w, h);
}
fz_catch(ctx)
{
fz_drop_colorspace(ctx, colorspace);
fz_rethrow(ctx);
}
if (colorspace)
{
fz_drop_colorspace(ctx, colorspace);
colorspace = NULL;
}
tile->mask = mask;
mask = NULL;
tile->interpolate = interpolate;
stride = (w * n * bpc + 7) / 8;
if (cstm)
{
stm = pdf_open_inline_stream(cstm, xref, dict, stride * h);
}
else
{
stm = pdf_open_stream(xref, fz_to_num(dict), fz_to_gen(dict));
/* RJW: "cannot open image data stream (%d 0 R)", fz_to_num(dict) */
}
samples = fz_malloc_array(ctx, h, stride);
len = fz_read(stm, samples, h * stride);
if (len < 0)
{
fz_throw(ctx, "cannot read image data");
}
/* Make sure we read the EOF marker (for inline images only) */
if (cstm)
{
unsigned char tbuf[512];
fz_try(ctx)
{
int tlen = fz_read(stm, tbuf, sizeof tbuf);
if (tlen > 0)
fz_warn(ctx, "ignoring garbage at end of image");
}
fz_catch(ctx)
{
fz_warn(ctx, "ignoring error at end of image");
}
}
fz_close(stm);
stm = NULL;
/* Pad truncated images */
if (len < stride * h)
{
fz_warn(ctx, "padding truncated image (%d 0 R)", fz_to_num(dict));
memset(samples + len, 0, stride * h - len);
}
/* Invert 1-bit image masks */
if (imagemask)
{
/* 0=opaque and 1=transparent so we need to invert */
unsigned char *p = samples;
len = h * stride;
for (i = 0; i < len; i++)
p[i] = ~p[i];
}
fz_unpack_tile(tile, samples, n, bpc, stride, indexed);
fz_free(ctx, samples);
samples = NULL;
if (usecolorkey)
pdf_mask_color_key(tile, n, colorkey);
if (indexed)
{
fz_pixmap *conv;
fz_decode_indexed_tile(tile, decode, (1 << bpc) - 1);
conv = pdf_expand_indexed_pixmap(ctx, tile);
fz_drop_pixmap(ctx, tile);
tile = conv;
}
else
{
fz_decode_tile(tile, decode);
}
}
fz_catch(ctx)
{
if (colorspace)
fz_drop_colorspace(ctx, colorspace);
if (mask)
fz_drop_pixmap(ctx, mask);
if (tile)
fz_drop_pixmap(ctx, tile);
fz_close(stm);
fz_free(ctx, samples);
fz_rethrow(ctx);
}
return tile;
}
fz_pixmap *
pdf_load_inline_image(pdf_document *xref, fz_obj *rdb, fz_obj *dict, fz_stream *file)
{
return pdf_load_image_imp(xref, rdb, dict, file, 0);
/* RJW: "cannot load inline image" */
}
int
pdf_is_jpx_image(fz_context *ctx, fz_obj *dict)
{
fz_obj *filter;
int i, n;
filter = fz_dict_gets(dict, "Filter");
if (!strcmp(fz_to_name(filter), "JPXDecode"))
return 1;
n = fz_array_len(filter);
for (i = 0; i < n; i++)
if (!strcmp(fz_to_name(fz_array_get(filter, i)), "JPXDecode"))
return 1;
return 0;
}
static fz_pixmap *
pdf_load_jpx_image(pdf_document *xref, fz_obj *dict)
{
fz_buffer *buf = NULL;
fz_colorspace *colorspace = NULL;
fz_pixmap *img = NULL;
fz_obj *obj;
fz_context *ctx = xref->ctx;
int indexed = 0;
fz_var(img);
fz_var(buf);
fz_var(colorspace);
buf = pdf_load_stream(xref, fz_to_num(dict), fz_to_gen(dict));
/* RJW: "cannot load jpx image data" */
/* FIXME: We can't handle decode arrays for indexed images currently */
fz_try(ctx)
{
obj = fz_dict_gets(dict, "ColorSpace");
if (obj)
{
colorspace = pdf_load_colorspace(xref, obj);
/* RJW: "cannot load image colorspace" */
indexed = !strcmp(colorspace->name, "Indexed");
}
img = fz_load_jpx_image(ctx, buf->data, buf->len, colorspace);
/* RJW: "cannot load jpx image" */
if (colorspace)
{
fz_drop_colorspace(ctx, colorspace);
colorspace = NULL;
}
fz_drop_buffer(ctx, buf);
buf = NULL;
obj = fz_dict_getsa(dict, "SMask", "Mask");
if (fz_is_dict(obj))
{
img->mask = pdf_load_image_imp(xref, NULL, obj, NULL, 1);
/* RJW: "cannot load image mask/softmask" */
}
obj = fz_dict_getsa(dict, "Decode", "D");
if (obj && !indexed)
{
float decode[FZ_MAX_COLORS * 2];
int i;
for (i = 0; i < img->n * 2; i++)
decode[i] = fz_to_real(fz_array_get(obj, i));
fz_decode_tile(img, decode);
}
}
fz_catch(ctx)
{
if (colorspace)
fz_drop_colorspace(ctx, colorspace);
fz_drop_buffer(ctx, buf);
fz_drop_pixmap(ctx, img);
fz_rethrow(ctx);
}
return img;
}
fz_pixmap *
pdf_load_image(pdf_document *xref, fz_obj *dict)
{
fz_context *ctx = xref->ctx;
fz_pixmap *pix;
if ((pix = fz_find_item(ctx, fz_free_pixmap_imp, dict)))
{
return pix;
}
pix = pdf_load_image_imp(xref, NULL, dict, NULL, 0);
/* RJW: "cannot load image (%d 0 R)", fz_to_num(dict) */
fz_store_item(ctx, dict, pix, fz_pixmap_size(pix));
return pix;
}
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