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); }
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 factor; pdf_image_key key; /* Check for 'simple' images which are just pixmaps */ /* SumatraPDF: don't produce additional tiles for preloaded images */ if (image->tile || !image->buffer) { 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) factor = 1; else for (factor=1; image->base.w/(2*factor) >= w && image->base.h/(2*factor) >= h && factor < 8; factor *= 2); /* Can we find any suitable tiles in the cache? */ key.refs = 1; key.image = &image->base; key.factor = factor; do { tile = fz_find_item(ctx, fz_free_pixmap_imp, &key, &pdf_image_store_type); if (tile) return tile; key.factor >>= 1; } while (key.factor > 0); /* We need to make a new one. */ stm = pdf_open_image_decomp_stream(ctx, image->buffer, &image->params, &factor); return decomp_image_from_stream(ctx, stm, image, 0, 0, factor, 0); }
static pdf_image * pdf_load_image_imp(pdf_document *xref, pdf_obj *rdb, pdf_obj *dict, fz_stream *cstm, int forcemask) { fz_stream *stm = NULL; pdf_image *image = NULL; pdf_obj *obj, *res; int w, h, bpc, n; int imagemask; int interpolate; int indexed; fz_image *mask = NULL; /* explicit mask/soft mask image */ int usecolorkey; int i; fz_context *ctx = xref->ctx; fz_var(stm); fz_var(mask); image = fz_malloc_struct(ctx, pdf_image); fz_try(ctx) { /* special case for JPEG2000 images */ if (pdf_is_jpx_image(ctx, dict)) { pdf_load_jpx(xref, dict, image, forcemask); if (forcemask) { fz_pixmap *mask_pixmap; if (image->n != 2) fz_throw(ctx, "soft mask must be grayscale"); mask_pixmap = fz_alpha_from_gray(ctx, image->tile, 1); fz_drop_pixmap(ctx, image->tile); image->tile = mask_pixmap; } break; /* Out of fz_try */ } w = pdf_to_int(pdf_dict_getsa(dict, "Width", "W")); h = pdf_to_int(pdf_dict_getsa(dict, "Height", "H")); bpc = pdf_to_int(pdf_dict_getsa(dict, "BitsPerComponent", "BPC")); if (bpc == 0) bpc = 8; imagemask = pdf_to_bool(pdf_dict_getsa(dict, "ImageMask", "IM")); interpolate = pdf_to_bool(pdf_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 (or less)"); if (h <= 0) fz_throw(ctx, "image height is zero (or less)"); if (bpc <= 0) fz_throw(ctx, "image depth is zero (or less)"); 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 = pdf_dict_getsa(dict, "ColorSpace", "CS"); if (obj && !imagemask && !forcemask) { /* colorspace resource lookup is only done for inline images */ if (pdf_is_name(obj)) { res = pdf_dict_get(pdf_dict_gets(rdb, "ColorSpace"), obj); if (res) obj = res; } image->base.colorspace = pdf_load_colorspace(xref, obj); if (!strcmp(image->base.colorspace->name, "Indexed")) indexed = 1; n = image->base.colorspace->n; } else { n = 1; } obj = pdf_dict_getsa(dict, "Decode", "D"); if (obj) { for (i = 0; i < n * 2; i++) image->decode[i] = pdf_to_real(pdf_array_get(obj, i)); } else { float maxval = indexed ? (1 << bpc) - 1 : 1; for (i = 0; i < n * 2; i++) image->decode[i] = i & 1 ? maxval : 0; } obj = pdf_dict_getsa(dict, "SMask", "Mask"); if (pdf_is_dict(obj)) { /* Not allowed for inline images or soft masks */ if (cstm) fz_warn(ctx, "Ignoring invalid inline image soft mask"); else if (forcemask) fz_warn(ctx, "Ignoring recursive image soft mask"); else mask = (fz_image *)pdf_load_image_imp(xref, rdb, obj, NULL, 1); } else if (pdf_is_array(obj)) { usecolorkey = 1; for (i = 0; i < n * 2; i++) { if (!pdf_is_int(pdf_array_get(obj, i))) { fz_warn(ctx, "invalid value in color key mask"); usecolorkey = 0; } image->colorkey[i] = pdf_to_int(pdf_array_get(obj, i)); } } /* Now, do we load a ref, or do we load the actual thing? */ FZ_INIT_STORABLE(&image->base, 1, pdf_free_image); image->base.get_pixmap = pdf_image_get_pixmap; image->base.w = w; image->base.h = h; image->base.bpc = bpc; image->n = n; image->interpolate = interpolate; image->imagemask = imagemask; image->usecolorkey = usecolorkey; image->base.mask = mask; if (!cstm) { /* Just load the compressed image data now and we can * decode it on demand. */ int num = pdf_to_num(dict); int gen = pdf_to_gen(dict); image->buffer = pdf_load_compressed_stream(xref, num, gen); break; /* Out of fz_try */ } /* We need to decompress the image now */ if (cstm) { int stride = (w * image->n * image->base.bpc + 7) / 8; stm = pdf_open_inline_stream(xref, dict, stride * h, cstm, NULL); } else { stm = pdf_open_stream(xref, pdf_to_num(dict), pdf_to_gen(dict)); } image->tile = decomp_image_from_stream(ctx, stm, image, cstm != NULL, indexed, 0, 0, 0); } fz_catch(ctx) { pdf_free_image(ctx, (fz_storable *) image); fz_rethrow(ctx); } return image; }
static fz_pixmap * decomp_image_banded(fz_context *ctx, fz_stream *stm, pdf_image *image, int indexed, int l2factor, int native_l2factor, int cache) { fz_pixmap *tile = NULL, *part = NULL; int w = (image->base.w + (1 << l2factor) - 1) >> l2factor; int h = (image->base.h + (1 << l2factor) - 1) >> l2factor; int part_h, orig_h = image->base.h; int band = 1 << fz_maxi(8, l2factor); fz_var(tile); fz_var(part); fz_try(ctx) { tile = fz_new_pixmap(ctx, image->base.colorspace, w, h); tile->interpolate = image->interpolate; tile->has_alpha = 0; /* SumatraPDF: allow optimizing non-alpha pixmaps */ /* decompress the image in bands of 256 lines */ for (part_h = h; part_h > 0; part_h -= band >> l2factor) { image->base.h = part_h > band >> l2factor ? band : (orig_h - 1) % band + 1; part = decomp_image_from_stream(ctx, fz_keep_stream(stm), image, -1, indexed, l2factor, native_l2factor, 0); memcpy(tile->samples + (h - part_h) * tile->w * tile->n, part->samples, part->h * part->w * part->n); tile->has_alpha |= part->has_alpha; /* SumatraPDF: allow optimizing non-alpha pixmaps */ fz_drop_pixmap(ctx, part); part = NULL; } /* cf. http://bugs.ghostscript.com/show_bug.cgi?id=693517 */ if (image->usecolorkey && image->base.mask) pdf_unblend_masked_tile(ctx, tile, image); } fz_always(ctx) { image->base.h = orig_h; fz_close(stm); } fz_catch(ctx) { fz_drop_pixmap(ctx, part); fz_drop_pixmap(ctx, tile); fz_rethrow(ctx); } if (cache) { pdf_image_key *key = NULL; fz_var(key); 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; fz_store_item(ctx, key, tile, fz_pixmap_size(ctx, tile), &pdf_image_store_type); } fz_always(ctx) { pdf_drop_image_key(ctx, key); } fz_catch(ctx) { } } return tile; }