fz_pixmap *
fz_decomp_image_from_stream(fz_context *ctx, fz_stream *stm, fz_image *image, int in_line, int indexed, int l2factor, int native_l2factor)
{
fz_pixmap *tile = NULL;
int stride, len, i;
unsigned char *samples = NULL;
int f = 1<<native_l2factor;
int w = (image->w + f-1) >> native_l2factor;
int h = (image->h + f-1) >> native_l2factor;
fz_var(tile);
fz_var(samples);
fz_try(ctx)
{
tile = fz_new_pixmap(ctx, image->colorspace, w, h);
tile->interpolate = image->interpolate;
stride = (w * image->n * image->bpc + 7) / 8;
samples = fz_malloc_array(ctx, h, stride);
len = fz_read(stm, samples, h * stride);
if (len < 0)
{
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot read image data");
}
/* Make sure we read the EOF marker (for inline images only) */
if (in_line)
{
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_rethrow_if(ctx, FZ_ERROR_TRYLATER);
fz_warn(ctx, "ignoring error at end of image");
}
}
/* Pad truncated images */
if (len < stride * h)
{
fz_warn(ctx, "padding truncated image");
memset(samples + len, 0, stride * h - len);
}
/* Invert 1-bit image masks */
if (image->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, image->n, image->bpc, stride, indexed);
fz_free(ctx, samples);
samples = NULL;
if (image->usecolorkey)
fz_mask_color_key(tile, image->n, image->colorkey);
if (indexed)
{
fz_pixmap *conv;
fz_decode_indexed_tile(tile, image->decode, (1 << image->bpc) - 1);
conv = fz_expand_indexed_pixmap(ctx, tile);
fz_drop_pixmap(ctx, tile);
tile = conv;
}
else
{
fz_decode_tile(tile, image->decode);
}
}
fz_always(ctx)
{
fz_close(stm);
}
fz_catch(ctx)
{
if (tile)
fz_drop_pixmap(ctx, tile);
fz_free(ctx, samples);
fz_rethrow(ctx);
}
/* Now apply any extra subsampling required */
if (l2factor - native_l2factor > 0)
{
if (l2factor - native_l2factor > 8)
l2factor = native_l2factor + 8;
fz_subsample_pixmap(ctx, tile, l2factor - native_l2factor);
}
return tile;
}
static fz_pixmap *
decomp_image_from_stream(fz_context *ctx, fz_stream *stm, pdf_image *image, int in_line, int indexed, int l2factor, int native_l2factor, int cache)
{
fz_pixmap *tile = NULL;
fz_pixmap *existing_tile;
int stride, len, i;
unsigned char *samples = NULL;
int f = 1<<native_l2factor;
int w = (image->base.w + f-1) >> native_l2factor;
int h = (image->base.h + f-1) >> native_l2factor;
pdf_image_key *key = NULL;
fz_var(tile);
fz_var(samples);
fz_var(key);
fz_try(ctx)
{
tile = fz_new_pixmap(ctx, image->base.colorspace, w, h);
tile->interpolate = image->interpolate;
stride = (w * image->n * image->base.bpc + 7) / 8;
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 (in_line)
{
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");
}
}
/* Pad truncated images */
if (len < stride * h)
{
fz_warn(ctx, "padding truncated image");
memset(samples + len, 0, stride * h - len);
}
/* Invert 1-bit image masks */
if (image->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, image->n, image->base.bpc, stride, indexed);
fz_free(ctx, samples);
samples = NULL;
if (image->usecolorkey)
pdf_mask_color_key(tile, image->n, image->colorkey);
if (indexed)
{
fz_pixmap *conv;
fz_decode_indexed_tile(tile, image->decode, (1 << image->base.bpc) - 1);
conv = pdf_expand_indexed_pixmap(ctx, tile);
fz_drop_pixmap(ctx, tile);
tile = conv;
}
else
{
fz_decode_tile(tile, image->decode);
}
}
fz_always(ctx)
{
fz_close(stm);
}
fz_catch(ctx)
{
if (tile)
fz_drop_pixmap(ctx, tile);
fz_free(ctx, samples);
fz_rethrow(ctx);
}
/* Now apply any extra subsampling required */
if (l2factor - native_l2factor > 0)
{
if (l2factor - native_l2factor > 8)
l2factor = native_l2factor + 8;
fz_subsample_pixmap(ctx, tile, l2factor - native_l2factor);
}
if (!cache)
return tile;
/* Now we try to cache the pixmap. Any failure here will just result
* in us not caching. */
fz_try(ctx)
{
key = fz_malloc_struct(ctx, pdf_image_key);
key->refs = 1;
key->image = fz_keep_image(ctx, &image->base);
key->l2factor = l2factor;
existing_tile = fz_store_item(ctx, key, tile, fz_pixmap_size(ctx, tile), &pdf_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)
{
pdf_drop_image_key(ctx, key);
}
fz_catch(ctx)
{
/* Do nothing */
}
return tile;
}
fz_pixmap *
fz_decomp_image_from_stream(fz_context *ctx, fz_stream *stm, fz_image *image, int indexed, int l2factor, int native_l2factor)
{
fz_pixmap *tile = NULL;
int stride, len, i;
unsigned char *samples = NULL;
int f = 1<<native_l2factor;
int w = (image->w + f-1) >> native_l2factor;
int h = (image->h + f-1) >> native_l2factor;
/* cf. http://code.google.com/p/sumatrapdf/issues/detail?id=1333 */
int is_banded = indexed < 0;
fz_var(tile);
fz_var(samples);
/* cf. http://code.google.com/p/sumatrapdf/issues/detail?id=1333 */
if (is_banded)
indexed = -1 - indexed;
else if (l2factor - native_l2factor > 0 && image->w > (1 << 8))
return decomp_image_banded(ctx, stm, image, indexed, l2factor, native_l2factor);
fz_try(ctx)
{
tile = fz_new_pixmap(ctx, image->colorspace, w, h);
tile->interpolate = image->interpolate;
stride = (w * image->n * image->bpc + 7) / 8;
samples = fz_malloc_array(ctx, h, stride);
len = fz_read(stm, samples, h * stride);
/* Pad truncated images */
if (len < stride * h)
{
fz_warn(ctx, "padding truncated image");
memset(samples + len, 0, stride * h - len);
}
/* Invert 1-bit image masks */
if (image->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, image->n, image->bpc, stride, indexed);
fz_free(ctx, samples);
samples = NULL;
if (image->usecolorkey && !image->mask)
fz_mask_color_key(tile, image->n, image->colorkey);
if (indexed)
{
fz_pixmap *conv;
fz_decode_indexed_tile(tile, image->decode, (1 << image->bpc) - 1);
conv = fz_expand_indexed_pixmap(ctx, tile);
fz_drop_pixmap(ctx, tile);
tile = conv;
}
else
{
fz_decode_tile(tile, image->decode);
}
/* cf. http://bugs.ghostscript.com/show_bug.cgi?id=693517 */
if (image->usecolorkey && image->mask && !is_banded)
fz_unblend_masked_tile(ctx, tile, image);
}
fz_always(ctx)
{
fz_close(stm);
}
fz_catch(ctx)
{
if (tile)
fz_drop_pixmap(ctx, tile);
fz_free(ctx, samples);
fz_rethrow(ctx);
}
/* Now apply any extra subsampling required */
if (l2factor - native_l2factor > 0)
{
if (l2factor - native_l2factor > 8)
l2factor = native_l2factor + 8;
fz_subsample_pixmap(ctx, tile, l2factor - native_l2factor);
}
return tile;
}
