fz_stream *
fz_open_image_decomp_stream_from_buffer(fz_context *ctx, fz_compressed_buffer *buffer, int *l2factor)
{
fz_stream *chain = fz_open_buffer(ctx, buffer->buffer);
return fz_open_image_decomp_stream(ctx, chain, &buffer->params, l2factor);
}
fz_stream *
fz_open_compressed_buffer(fz_context *ctx, fz_compressed_buffer *buffer)
{
int factor = 1;
return fz_open_image_decomp_stream(ctx, buffer, &factor);
}
/*
* Create a filter given a name and param dictionary.
*/
static fz_stream *
build_filter(fz_context *ctx, fz_stream *chain, pdf_document *doc, pdf_obj *f, pdf_obj *p, int num, int gen, fz_compression_params *params)
{
fz_compression_params local_params;
if (params == NULL)
params = &local_params;
build_compression_params(ctx, f, p, params);
/* If we were using params we were passed in, and we successfully
* recognised the image type, we can use the existing filter and
* shortstop here. */
if (params != &local_params && params->type != FZ_IMAGE_RAW)
return chain;
if (params->type != FZ_IMAGE_RAW)
return fz_open_image_decomp_stream(ctx, chain, params, NULL);
if (pdf_name_eq(ctx, f, PDF_NAME_ASCIIHexDecode) || pdf_name_eq(ctx, f, PDF_NAME_AHx))
return fz_open_ahxd(ctx, chain);
else if (pdf_name_eq(ctx, f, PDF_NAME_ASCII85Decode) || pdf_name_eq(ctx, f, PDF_NAME_A85))
return fz_open_a85d(ctx, chain);
else if (pdf_name_eq(ctx, f, PDF_NAME_JBIG2Decode))
{
fz_jbig2_globals *globals = NULL;
pdf_obj *obj = pdf_dict_get(ctx, p, PDF_NAME_JBIG2Globals);
if (pdf_is_indirect(ctx, obj))
globals = pdf_load_jbig2_globals(ctx, doc, obj);
/* fz_open_jbig2d takes possession of globals */
return fz_open_jbig2d(ctx, chain, globals);
}
else if (pdf_name_eq(ctx, f, PDF_NAME_JPXDecode))
return chain; /* JPX decoding is special cased in the image loading code */
else if (pdf_name_eq(ctx, f, PDF_NAME_Crypt))
{
pdf_obj *name;
if (!doc->crypt)
{
fz_warn(ctx, "crypt filter in unencrypted document");
return chain;
}
name = pdf_dict_get(ctx, p, PDF_NAME_Name);
if (pdf_is_name(ctx, name))
return pdf_open_crypt_with_filter(ctx, chain, doc->crypt, name, num, gen);
return chain;
}
fz_warn(ctx, "unknown filter name (%s)", pdf_to_name(ctx, f));
return chain;
}
static fz_pixmap *
pdf_image_get_pixmap(fz_context *ctx, fz_image *image_, int w, int h)
{
pdf_image *image = (pdf_image *)image_;
fz_pixmap *tile;
fz_stream *stm;
int l2factor;
pdf_image_key key;
int native_l2factor;
int indexed;
/* Check for 'simple' images which are just pixmaps */
if (image->buffer == NULL)
{
tile = image->tile;
if (!tile)
return NULL;
return fz_keep_pixmap(ctx, tile); /* That's all we can give you! */
}
/* Ensure our expectations for tile size are reasonable */
if (w > image->base.w)
w = image->base.w;
if (h > image->base.h)
h = image->base.h;
/* What is our ideal factor? */
if (w == 0 || h == 0)
l2factor = 0;
else
for (l2factor=0; image->base.w>>(l2factor+1) >= w && image->base.h>>(l2factor+1) >= h && l2factor < 8; l2factor++);
/* Can we find any suitable tiles in the cache? */
key.refs = 1;
key.image = &image->base;
key.l2factor = l2factor;
do
{
tile = fz_find_item(ctx, fz_free_pixmap_imp, &key, &pdf_image_store_type);
if (tile)
return tile;
key.l2factor--;
}
while (key.l2factor >= 0);
/* We need to make a new one. */
native_l2factor = l2factor;
stm = fz_open_image_decomp_stream(ctx, image->buffer, &native_l2factor);
indexed = fz_colorspace_is_indexed(image->base.colorspace);
return decomp_image_from_stream(ctx, stm, image, 0, indexed, l2factor, native_l2factor, 1);
}
void
pdf_load_compressed_inline_image(fz_context *ctx, pdf_document *doc, pdf_obj *dict, int length, fz_stream *stm, int indexed, fz_image *image)
{
fz_compressed_buffer *bc = fz_malloc_struct(ctx, fz_compressed_buffer);
fz_try(ctx)
{
int dummy_l2factor = 0;
bc->buffer = fz_new_buffer(ctx, 1024);
stm = pdf_open_inline_stream(ctx, doc, dict, length, stm, &bc->params);
stm = fz_open_leecher(ctx, stm, bc->buffer);
stm = fz_open_image_decomp_stream(ctx, stm, &bc->params, &dummy_l2factor);
image->tile = fz_decomp_image_from_stream(ctx, stm, image, indexed, 0, 0);
}
fz_catch(ctx)
{
fz_drop_compressed_buffer(ctx, bc);
fz_rethrow(ctx);
}
image->buffer = bc;
}
fz_pixmap *
fz_image_get_pixmap(fz_context *ctx, fz_image *image, int w, int h)
{
fz_pixmap *tile;
fz_stream *stm;
int l2factor;
fz_image_key key;
int native_l2factor;
int indexed;
fz_image_key *keyp;
/* Check for 'simple' images which are just pixmaps */
if (image->buffer == NULL)
{
tile = image->tile;
if (!tile)
return NULL;
return fz_keep_pixmap(ctx, tile); /* That's all we can give you! */
}
/* Ensure our expectations for tile size are reasonable */
if (w > image->w)
w = image->w;
if (h > image->h)
h = image->h;
/* What is our ideal factor? */
if (w == 0 || h == 0)
l2factor = 0;
else
for (l2factor=0; image->w>>(l2factor+1) >= w && image->h>>(l2factor+1) >= h && l2factor < 8; l2factor++);
/* Can we find any suitable tiles in the cache? */
key.refs = 1;
key.image = image;
key.l2factor = l2factor;
do
{
tile = fz_find_item(ctx, fz_free_pixmap_imp, &key, &fz_image_store_type);
if (tile)
return tile;
key.l2factor--;
}
while (key.l2factor >= 0);
/* We need to make a new one. */
/* First check for ones that we can't decode using streams */
switch (image->buffer->params.type)
{
case FZ_IMAGE_PNG:
tile = fz_load_png(ctx, image->buffer->buffer->data, image->buffer->buffer->len);
break;
case FZ_IMAGE_TIFF:
tile = fz_load_tiff(ctx, image->buffer->buffer->data, image->buffer->buffer->len);
break;
default:
native_l2factor = l2factor;
stm = fz_open_image_decomp_stream(ctx, image->buffer, &native_l2factor);
indexed = fz_colorspace_is_indexed(image->colorspace);
tile = fz_decomp_image_from_stream(ctx, stm, image, 0, indexed, l2factor, native_l2factor);
break;
}
/* Now we try to cache the pixmap. Any failure here will just result
* in us not caching. */
fz_var(keyp);
fz_try(ctx)
{
fz_pixmap *existing_tile;
keyp = fz_malloc_struct(ctx, fz_image_key);
keyp->refs = 1;
keyp->image = fz_keep_image(ctx, image);
keyp->l2factor = l2factor;
existing_tile = fz_store_item(ctx, keyp, tile, fz_pixmap_size(ctx, tile), &fz_image_store_type);
if (existing_tile)
{
/* We already have a tile. This must have been produced by a
* racing thread. We'll throw away ours and use that one. */
fz_drop_pixmap(ctx, tile);
tile = existing_tile;
}
}
fz_always(ctx)
{
fz_drop_image_key(ctx, keyp);
}
fz_catch(ctx)
{
/* Do nothing */
}
return tile;
}
