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diff --git a/pdf/pdf_trans.h b/pdf/pdf_trans.h
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+/* Copyright (C) 2019-2021 Artifex Software, Inc.
+   All Rights Reserved.
+
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied,
+   modified or distributed except as expressly authorized under the terms
+   of the license contained in the file LICENSE in this distribution.
+
+   Refer to licensing information at http://www.artifex.com or contact
+   Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
+   CA 94945, U.S.A., +1(415)492-9861, for further information.
+*/
+
+#ifndef PDF_TRANSPARENCY_OPERATORS
+#define PDF_TRANSPARENCY_OPERATORS
+
+/* these names are to match the PS code (pdf_ops.ps/OPSaveDstack, setup_trans, teardown_trans) */
+typedef struct {
+    bool GroupPushed;
+    bool ChangeBM;
+    float saveStrokeAlpha;
+    float saveFillAlpha;
+    gs_blend_mode_t saveBM;
+} pdfi_trans_state_t;
+
+typedef enum {
+    TRANSPARENCY_Caller_Other,
+    TRANSPARENCY_Caller_Image,
+    TRANSPARENCY_Caller_Stroke,
+    TRANSPARENCY_Caller_Fill, /* Also includes EOFill */
+    TRANSPARENCY_Caller_FillStroke /* Also includes EOFillStroke */
+} pdfi_transparency_caller_t;
+
+int pdfi_trans_setup_text(pdf_context *ctx, pdfi_trans_state_t *state, bool is_show);
+int pdfi_trans_teardown_text(pdf_context *ctx, pdfi_trans_state_t *state);
+int pdfi_trans_setup(pdf_context *ctx, pdfi_trans_state_t *state, gs_rect *bbox, pdfi_transparency_caller_t caller);
+
+int pdfi_trans_teardown(pdf_context *ctx, pdfi_trans_state_t *state);
+
+int pdfi_trans_begin_simple_group(pdf_context *ctx, gs_rect *bbox, bool stroked_bbox, bool isolated, bool knockout);
+int pdfi_trans_begin_page_group(pdf_context *ctx, pdf_dict *page_dict, pdf_dict *group_dict);
+int pdfi_trans_begin_form_group(pdf_context *ctx, pdf_dict *page_dict, pdf_dict *form_dict);
+int pdfi_trans_end_group(pdf_context *ctx);
+int pdfi_trans_end_simple_group(pdf_context *ctx);
+int pdfi_trans_set_params(pdf_context *ctx);
+int pdfi_trans_begin_isolated_group(pdf_context *ctx, bool image_with_SMask, gs_color_space *pcs);
+int pdfi_trans_end_isolated_group(pdf_context *ctx);
+int pdfi_trans_end_smask_notify(pdf_context *ctx);
+void pdfi_trans_set_needs_OP(pdf_context *ctx);
+
+#endif