static void writeobject(int num, int gen) { fz_error error; fz_obj *obj; fz_obj *type; error = pdf_load_object(&obj, xref, num, gen); if (error) die(error); /* skip ObjStm and XRef objects */ if (fz_is_dict(ctx, obj)) { type = fz_dict_gets(ctx, obj, "Type"); if (fz_is_name(ctx, type) && !strcmp(fz_to_name(ctx, type), "ObjStm")) { uselist[num] = 0; fz_drop_obj(ctx, obj); return; } if (fz_is_name(ctx, type) && !strcmp(fz_to_name(ctx, type), "XRef")) { uselist[num] = 0; fz_drop_obj(ctx, obj); return; } } if (!pdf_is_stream(xref, num, gen)) { fprintf(out, "%d %d obj\n", num, gen); fz_fprint_obj(ctx, out, obj, !doexpand); fprintf(out, "endobj\n\n"); } else { if (doexpand && !pdf_is_jpx_image(ctx, obj)) expandstream(obj, num, gen); else copystream(obj, num, gen); } fz_drop_obj(ctx, obj); }
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 void writeobject(int num, int gen) { fz_obj *obj; fz_obj *type; obj = pdf_load_object(xref, num, gen); /* skip ObjStm and XRef objects */ if (fz_is_dict(obj)) { type = fz_dict_gets(obj, "Type"); if (fz_is_name(type) && !strcmp(fz_to_name(type), "ObjStm")) { uselist[num] = 0; fz_drop_obj(obj); return; } if (fz_is_name(type) && !strcmp(fz_to_name(type), "XRef")) { uselist[num] = 0; fz_drop_obj(obj); return; } } if (!pdf_is_stream(xref, num, gen)) { fprintf(out, "%d %d obj\n", num, gen); fz_fprint_obj(out, obj, doexpand == 0); fprintf(out, "endobj\n\n"); } else { int dontexpand = 0; if (doexpand != 0 && doexpand != expand_all) { fz_obj *o; if ((o = fz_dict_gets(obj, "Type"), !strcmp(fz_to_name(o), "XObject")) && (o = fz_dict_gets(obj, "Subtype"), !strcmp(fz_to_name(o), "Image"))) dontexpand = !(doexpand & expand_images); if (o = fz_dict_gets(obj, "Type"), !strcmp(fz_to_name(o), "Font")) dontexpand = !(doexpand & expand_fonts); if (o = fz_dict_gets(obj, "Type"), !strcmp(fz_to_name(o), "FontDescriptor")) dontexpand = !(doexpand & expand_fonts); if ((o = fz_dict_gets(obj, "Length1")) != NULL) dontexpand = !(doexpand & expand_fonts); if ((o = fz_dict_gets(obj, "Length2")) != NULL) dontexpand = !(doexpand & expand_fonts); if ((o = fz_dict_gets(obj, "Length3")) != NULL) dontexpand = !(doexpand & expand_fonts); if (o = fz_dict_gets(obj, "Subtype"), !strcmp(fz_to_name(o), "Type1C")) dontexpand = !(doexpand & expand_fonts); if (o = fz_dict_gets(obj, "Subtype"), !strcmp(fz_to_name(o), "CIDFontType0C")) dontexpand = !(doexpand & expand_fonts); } if (doexpand && !dontexpand && !pdf_is_jpx_image(ctx, obj)) expandstream(obj, num, gen); else copystream(obj, num, gen); } fz_drop_obj(obj); }
static fz_image * pdf_load_image_imp(pdf_document *doc, pdf_obj *rdb, pdf_obj *dict, fz_stream *cstm, int forcemask) { fz_stream *stm = NULL; fz_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 = 0; fz_colorspace *colorspace = NULL; float decode[FZ_MAX_COLORS * 2]; int colorkey[FZ_MAX_COLORS * 2]; int stride; int i; fz_context *ctx = doc->ctx; fz_compressed_buffer *buffer; fz_var(stm); fz_var(mask); fz_var(image); fz_var(colorspace); fz_try(ctx) { /* special case for JPEG2000 images */ if (pdf_is_jpx_image(ctx, dict)) { // image = pdf_load_jpx(doc, dict, forcemask); // // if (forcemask) // { // fz_pixmap *mask_pixmap; // if (image->n != 2) // { // fz_pixmap *gray; // fz_irect bbox; // fz_warn(ctx, "soft mask should be grayscale"); // gray = fz_new_pixmap_with_bbox(ctx, fz_device_gray(ctx), fz_pixmap_bbox(ctx, image->tile, &bbox)); // fz_convert_pixmap(ctx, gray, image->tile); // fz_drop_pixmap(ctx, image->tile); // image->tile = gray; // } // 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; if (imagemask) bpc = 1; if (w <= 0) fz_throw(ctx, FZ_ERROR_GENERIC, "image width is zero (or less)"); if (h <= 0) fz_throw(ctx, FZ_ERROR_GENERIC, "image height is zero (or less)"); if (bpc <= 0) fz_throw(ctx, FZ_ERROR_GENERIC, "image depth is zero (or less)"); if (bpc > 16) fz_throw(ctx, FZ_ERROR_GENERIC, "image depth is too large: %d", bpc); if (w > (1 << 16)) fz_throw(ctx, FZ_ERROR_GENERIC, "image is too wide"); if (h > (1 << 16)) fz_throw(ctx, FZ_ERROR_GENERIC, "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; } colorspace = pdf_load_colorspace(doc, obj); indexed = fz_colorspace_is_indexed(colorspace); n = colorspace->n; } else { n = 1; } obj = pdf_dict_getsa(dict, "Decode", "D"); if (obj) { for (i = 0; i < n * 2; i++) 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++) 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 = pdf_load_image_imp(doc, rdb, obj, NULL, 1); obj = pdf_dict_gets(obj, "Matte"); if (pdf_is_array(obj)) { usecolorkey = 1; for (i = 0; i < n; i++) colorkey[i] = pdf_to_real(pdf_array_get(obj, i)) * 255; } } } 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; } colorkey[i] = pdf_to_int(pdf_array_get(obj, i)); } } /* Do we load from a ref, or do we load an inline stream? */ if (cstm == NULL) { /* 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); buffer = pdf_load_compressed_stream(doc, num, gen); image = fz_new_image(ctx, w, h, bpc, colorspace, 96, 96, interpolate, imagemask, decode, usecolorkey ? colorkey : NULL, buffer, mask); } else { /* Inline stream */ stride = (w * n * bpc + 7) / 8; image = fz_new_image(ctx, w, h, bpc, colorspace, 96, 96, interpolate, imagemask, decode, usecolorkey ? colorkey : NULL, NULL, mask); pdf_load_compressed_inline_image(doc, dict, stride * h, cstm, indexed, image); } } fz_catch(ctx) { fz_drop_colorspace(ctx, colorspace); fz_drop_image(ctx, mask); fz_drop_image(ctx, image); fz_rethrow(ctx); } return image; }
static fz_error pdf_load_image_imp(fz_pixmap **imgp, pdf_xref *xref, fz_obj *rdb, fz_obj *dict, fz_stream *cstm, int forcemask) { fz_stream *stm; fz_pixmap *tile; fz_obj *obj, *res; fz_error error; int w, h, bpc, n; int imagemask; int interpolate; int indexed; fz_colorspace *colorspace; fz_pixmap *mask; /* explicit mask/softmask image */ int usecolorkey; int colorkey[FZ_MAX_COLORS * 2]; float decode[FZ_MAX_COLORS * 2]; int stride; unsigned char *samples; int i, len; /* special case for JPEG2000 images */ if (pdf_is_jpx_image(dict)) { tile = NULL; error = pdf_load_jpx_image(&tile, xref, dict); if (error) return fz_rethrow(error, "cannot load jpx image"); if (forcemask) { if (tile->n != 2) { fz_drop_pixmap(tile); return fz_throw("softmask must be grayscale"); } mask = fz_alpha_from_gray(tile, 1); fz_drop_pixmap(tile); *imgp = mask; return fz_okay; } *imgp = tile; return fz_okay; } 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; colorspace = NULL; mask = NULL; if (imagemask) bpc = 1; if (w == 0) return fz_throw("image width is zero"); if (h == 0) return fz_throw("image height is zero"); if (bpc == 0) return fz_throw("image depth is zero"); if (w > (1 << 16)) return fz_throw("image is too wide"); if (h > (1 << 16)) return fz_throw("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; } error = pdf_load_colorspace(&colorspace, xref, obj); if (error) return fz_rethrow(error, "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) { error = pdf_load_image_imp(&mask, xref, rdb, obj, NULL, 1); if (error) { if (colorspace) fz_drop_colorspace(colorspace); return fz_rethrow(error, "cannot load image mask/softmask"); } } } else if (fz_is_array(obj)) { usecolorkey = 1; for (i = 0; i < n * 2; i++) colorkey[i] = fz_to_int(fz_array_get(obj, i)); } /* Allocate now, to fail early if we run out of memory */ tile = fz_new_pixmap_with_limit(colorspace, w, h); if (!tile) { if (colorspace) fz_drop_colorspace(colorspace); if (mask) fz_drop_pixmap(mask); return fz_throw("out of memory"); } if (colorspace) fz_drop_colorspace(colorspace); tile->mask = mask; tile->interpolate = interpolate; stride = (w * n * bpc + 7) / 8; if (cstm) { stm = pdf_open_inline_stream(cstm, xref, dict, stride * h); } else { error = pdf_open_stream(&stm, xref, fz_to_num(dict), fz_to_gen(dict)); if (error) { fz_drop_pixmap(tile); return fz_rethrow(error, "cannot open image data stream (%d 0 R)", fz_to_num(dict)); } } samples = fz_calloc(h, stride); len = fz_read(stm, samples, h * stride); if (len < 0) { fz_close(stm); fz_free(samples); fz_drop_pixmap(tile); return fz_rethrow(len, "cannot read image data"); } /* Make sure we read the EOF marker (for inline images only) */ if (cstm) { unsigned char tbuf[512]; int tlen = fz_read(stm, tbuf, sizeof tbuf); if (tlen < 0) fz_catch(tlen, "ignoring error at end of image"); if (tlen > 0) fz_warn("ignoring garbage at end of image"); } fz_close(stm); /* Pad truncated images */ if (len < stride * h) { fz_warn("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(samples); 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(tile); fz_drop_pixmap(tile); tile = conv; } else { fz_decode_tile(tile, decode); } *imgp = tile; return fz_okay; }
static fz_image * pdf_load_image_imp(pdf_document *xref, pdf_obj *rdb, pdf_obj *dict, fz_stream *cstm, int forcemask) { fz_stream *stm = NULL; fz_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 = 0; fz_colorspace *colorspace = NULL; float decode[FZ_MAX_COLORS * 2]; int colorkey[FZ_MAX_COLORS * 2]; int i; fz_context *ctx = xref->ctx; fz_var(stm); fz_var(mask); fz_var(image); fz_var(colorspace); fz_try(ctx) { /* special case for JPEG2000 images */ if (pdf_is_jpx_image(ctx, dict)) { image = pdf_load_jpx(xref, dict, forcemask); if (forcemask) { fz_pixmap *mask_pixmap; if (image->n != 2) { /* SumatraPDF: ignore invalid JPX softmasks */ fz_warn(ctx, "soft mask must be grayscale"); mask_pixmap = fz_new_pixmap(ctx, NULL, image->tile->w, image->tile->h); fz_clear_pixmap_with_value(ctx, mask_pixmap, 255); } else 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; } colorspace = pdf_load_colorspace(xref, obj); if (!strcmp(colorspace->name, "Indexed")) indexed = 1; n = colorspace->n; } else { n = 1; } obj = pdf_dict_getsa(dict, "Decode", "D"); if (obj) { for (i = 0; i < n * 2; i++) 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++) 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 = 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; } colorkey[i] = pdf_to_int(pdf_array_get(obj, i)); } } /* Now, do we load a ref, or do we load the actual thing? */ 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); fz_compressed_buffer *buffer = pdf_load_compressed_stream(xref, num, gen); image = fz_new_image(ctx, w, h, bpc, colorspace, 96, 96, interpolate, imagemask, decode, usecolorkey ? colorkey : NULL, buffer, mask); break; /* Out of fz_try */ } /* We need to decompress the image now */ if (cstm) { int stride = (w * n * 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 = fz_new_image(ctx, w, h, bpc, colorspace, 96, 96, interpolate, imagemask, decode, usecolorkey ? colorkey : NULL, NULL, mask); image->tile = fz_decomp_image_from_stream(ctx, stm, image, cstm != NULL, indexed, 0, 0); } fz_catch(ctx) { /* SumatraPDF: fix memory leak */ if (!image) fz_drop_colorspace(ctx, colorspace); else fz_drop_image(ctx, image); fz_rethrow(ctx); } /* cf. http://bugs.ghostscript.com/show_bug.cgi?id=693517 */ fz_try(ctx) { obj = pdf_dict_getp(dict, "SMask/Matte"); if (pdf_is_array(obj) && image->mask) { assert(!image->usecolorkey); image->usecolorkey = 2; for (i = 0; i < n; i++) image->colorkey[i] = pdf_to_int(pdf_array_get(obj, i)); } } fz_catch(ctx) { fz_drop_image(ctx, image); fz_rethrow(ctx); } return image; }
static fz_image * pdf_load_image_imp(fz_context *ctx, pdf_document *doc, pdf_obj *rdb, pdf_obj *dict, fz_stream *cstm, int forcemask) { fz_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 use_colorkey = 0; fz_colorspace *colorspace = NULL; float decode[FZ_MAX_COLORS * 2]; int colorkey[FZ_MAX_COLORS * 2]; int stride; int i; fz_compressed_buffer *buffer; /* special case for JPEG2000 images */ if (pdf_is_jpx_image(ctx, dict)) return pdf_load_jpx_imp(ctx, doc, rdb, dict, cstm, forcemask); w = pdf_to_int(ctx, pdf_dict_geta(ctx, dict, PDF_NAME(Width), PDF_NAME(W))); h = pdf_to_int(ctx, pdf_dict_geta(ctx, dict, PDF_NAME(Height), PDF_NAME(H))); bpc = pdf_to_int(ctx, pdf_dict_geta(ctx, dict, PDF_NAME(BitsPerComponent), PDF_NAME(BPC))); if (bpc == 0) bpc = 8; imagemask = pdf_to_bool(ctx, pdf_dict_geta(ctx, dict, PDF_NAME(ImageMask), PDF_NAME(IM))); interpolate = pdf_to_bool(ctx, pdf_dict_geta(ctx, dict, PDF_NAME(Interpolate), PDF_NAME(I))); indexed = 0; use_colorkey = 0; if (imagemask) bpc = 1; if (w <= 0) fz_throw(ctx, FZ_ERROR_GENERIC, "image width is zero (or less)"); if (h <= 0) fz_throw(ctx, FZ_ERROR_GENERIC, "image height is zero (or less)"); if (bpc <= 0) fz_throw(ctx, FZ_ERROR_GENERIC, "image depth is zero (or less)"); if (bpc > 16) fz_throw(ctx, FZ_ERROR_GENERIC, "image depth is too large: %d", bpc); if (w > (1 << 16)) fz_throw(ctx, FZ_ERROR_GENERIC, "image is too wide"); if (h > (1 << 16)) fz_throw(ctx, FZ_ERROR_GENERIC, "image is too high"); fz_var(mask); fz_var(image); fz_var(colorspace); fz_try(ctx) { obj = pdf_dict_geta(ctx, dict, PDF_NAME(ColorSpace), PDF_NAME(CS)); if (obj && !imagemask && !forcemask) { /* colorspace resource lookup is only done for inline images */ if (pdf_is_name(ctx, obj)) { res = pdf_dict_get(ctx, pdf_dict_get(ctx, rdb, PDF_NAME(ColorSpace)), obj); if (res) obj = res; } colorspace = pdf_load_colorspace(ctx, obj); indexed = fz_colorspace_is_indexed(ctx, colorspace); n = fz_colorspace_n(ctx, colorspace); } else { n = 1; } obj = pdf_dict_geta(ctx, dict, PDF_NAME(Decode), PDF_NAME(D)); if (obj) { for (i = 0; i < n * 2; i++) decode[i] = pdf_array_get_real(ctx, obj, i); } else if (fz_colorspace_is_lab(ctx, colorspace) || fz_colorspace_is_lab_icc(ctx, colorspace)) { decode[0] = 0; decode[1] = 100; decode[2] = -128; decode[3] = 127; decode[4] = -128; decode[5] = 127; } else { float maxval = indexed ? (1 << bpc) - 1 : 1; for (i = 0; i < n * 2; i++) decode[i] = i & 1 ? maxval : 0; } obj = pdf_dict_geta(ctx, dict, PDF_NAME(SMask), PDF_NAME(Mask)); if (pdf_is_dict(ctx, 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 = pdf_load_image_imp(ctx, doc, rdb, obj, NULL, 1); obj = pdf_dict_get(ctx, obj, PDF_NAME(Matte)); if (pdf_is_array(ctx, obj)) { use_colorkey = 1; for (i = 0; i < n; i++) colorkey[i] = pdf_array_get_real(ctx, obj, i) * 255; } } } else if (pdf_is_array(ctx, obj)) { use_colorkey = 1; for (i = 0; i < n * 2; i++) { if (!pdf_is_int(ctx, pdf_array_get(ctx, obj, i))) { fz_warn(ctx, "invalid value in color key mask"); use_colorkey = 0; } colorkey[i] = pdf_array_get_int(ctx, obj, i); } } /* Do we load from a ref, or do we load an inline stream? */ if (cstm == NULL) { /* Just load the compressed image data now and we can decode it on demand. */ buffer = pdf_load_compressed_stream(ctx, doc, pdf_to_num(ctx, dict)); image = fz_new_image_from_compressed_buffer(ctx, w, h, bpc, colorspace, 96, 96, interpolate, imagemask, decode, use_colorkey ? colorkey : NULL, buffer, mask); image->invert_cmyk_jpeg = 0; } else { /* Inline stream */ stride = (w * n * bpc + 7) / 8; image = fz_new_image_from_compressed_buffer(ctx, w, h, bpc, colorspace, 96, 96, interpolate, imagemask, decode, use_colorkey ? colorkey : NULL, NULL, mask); image->invert_cmyk_jpeg = 0; pdf_load_compressed_inline_image(ctx, doc, dict, stride * h, cstm, indexed, (fz_compressed_image *)image); } } fz_always(ctx) { fz_drop_colorspace(ctx, colorspace); fz_drop_image(ctx, mask); } fz_catch(ctx) { fz_drop_image(ctx, image); fz_rethrow(ctx); } return image; }