/* Copyright (C) 2001-2006 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 that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: gstparam.h 8022 2007-06-05 22:23:38Z giles $ */
/* Transparency parameter definitions */

#ifndef gstparam_INCLUDED
#  define gstparam_INCLUDED

#include "gsccolor.h"
#include "gsrefct.h"

/* Define the names of the known blend modes. */
typedef enum {
    BLEND_MODE_Compatible,
    BLEND_MODE_Normal,
    BLEND_MODE_Multiply,
    BLEND_MODE_Screen,
    BLEND_MODE_Difference,
    BLEND_MODE_Darken,
    BLEND_MODE_Lighten,
    BLEND_MODE_ColorDodge,
    BLEND_MODE_ColorBurn,
    BLEND_MODE_Exclusion,
    BLEND_MODE_HardLight,
    BLEND_MODE_Overlay,
    BLEND_MODE_SoftLight,
    BLEND_MODE_Luminosity,
    BLEND_MODE_Hue,
    BLEND_MODE_Saturation,
    BLEND_MODE_Color
#define MAX_BLEND_MODE BLEND_MODE_Color
} gs_blend_mode_t;
#define GS_BLEND_MODE_NAMES\
  "Compatible", "Normal", "Multiply", "Screen", "Difference",\
  "Darken", "Lighten", "ColorDodge", "ColorBurn", "Exclusion",\
  "HardLight", "Overlay", "SoftLight", "Luminosity", "Hue",\
  "Saturation", "Color"

/* Define the common part for a transparency stack state. */
typedef enum {
    TRANSPARENCY_STATE_Group = 1,	/* must not be 0 */
    TRANSPARENCY_STATE_Mask
} gs_transparency_state_type_t;
#define GS_TRANSPARENCY_STATE_COMMON\
    gs_transparency_state_t *saved;\
    gs_transparency_state_type_t type
typedef struct gs_transparency_state_s gs_transparency_state_t;
struct gs_transparency_state_s {
    GS_TRANSPARENCY_STATE_COMMON;
};

/* Define the common part for a cached transparency mask. */
#define GS_TRANSPARENCY_MASK_COMMON\
    rc_header rc
typedef struct gs_transparency_mask_s {
    GS_TRANSPARENCY_MASK_COMMON;
} gs_transparency_mask_t;

/* Define the parameter structure for a transparency group. */
#ifndef gs_color_space_DEFINED
#  define gs_color_space_DEFINED
typedef struct gs_color_space_s gs_color_space;
#endif
#ifndef gs_function_DEFINED
typedef struct gs_function_s gs_function_t;
#  define gs_function_DEFINED
#endif

/* (Update gs_trans_group_params_init if these change.) */
typedef struct gs_transparency_group_params_s {
    const gs_color_space *ColorSpace;
    bool Isolated;
    bool Knockout;
    bool image_with_SMask;
} gs_transparency_group_params_t;

/* Define the parameter structure for a transparency mask. */
typedef enum {
    TRANSPARENCY_MASK_Alpha,
    TRANSPARENCY_MASK_Luminosity
} gs_transparency_mask_subtype_t;

#define GS_TRANSPARENCY_MASK_SUBTYPE_NAMES\
  "Alpha", "Luminosity"

/* See the gx_transparency_mask_params_t type below */
/* (Update gs_trans_mask_params_init if these change.) */
typedef struct gs_transparency_mask_params_s {
    gs_transparency_mask_subtype_t subtype;
    int Background_components;
    float Background[GS_CLIENT_COLOR_MAX_COMPONENTS];
    float GrayBackground;
    int (*TransferFunction)(floatp in, float *out, void *proc_data);
    gs_function_t *TransferFunction_data;
} gs_transparency_mask_params_t;

#define MASK_TRANSFER_FUNCTION_SIZE 256

/* The post clist version of transparency mask parameters */
typedef struct gx_transparency_mask_params_s {
    gs_transparency_mask_subtype_t subtype;
    int Background_components;
    float Background[GS_CLIENT_COLOR_MAX_COMPONENTS];
    float GrayBackground;
    bool function_is_identity;
    byte transfer_fn[MASK_TRANSFER_FUNCTION_SIZE];
} gx_transparency_mask_params_t;

#define MAX_CLIST_COMPOSITOR_SIZE (sizeof( gx_transparency_mask_params_t ) + 1)

/* Select the opacity or shape parameters. */
typedef enum {
    TRANSPARENCY_CHANNEL_Opacity = 0,
    TRANSPARENCY_CHANNEL_Shape = 1
} gs_transparency_channel_selector_t;

#endif /* gstparam_INCLUDED */