/* Copyright (C) 2001-2023 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.,  39 Mesa Street, Suite 108A, San Francisco,
   CA 94129, USA, for further information.
*/

/* High level device color save/compare procedures */

/*
 * See comments at the start of gxhldevc.h for more explanation of the
 * purpose and operation of these procedures.
 */
#include "gx.h"
#include "gzstate.h"
#include "gscspace.h"
#include "gxcspace.h"
#include "gxhldevc.h"
#include "memory_.h"
#include "gxpcolor.h"
#include "gsptype1.h"
#include "gsptype2.h"

/*
 * Initiailze a high level saved color to null
 */
void gx_hld_saved_color_init(gx_hl_saved_color * psc)
{
    gx_device_color temp_devc;

    memset(psc, 0, sizeof(*psc));	/* clear the entire structure */
    psc->color_space_id = psc->pattern_id = gs_no_id;
    color_set_null(&temp_devc);
    temp_devc.type->save_dc(&temp_devc, &(psc->saved_dev_color));
}

/*
 * Save the device color information including the color space id and
 * client color data (if available).
 *
 * More description in src/gxhldevc.h
 */
bool
gx_hld_save_color(const gs_gstate * pgs, const gx_device_color * pdevc,
                gx_hl_saved_color * psc)
{
    memset(psc, 0, sizeof(*psc));	/* clear the entire structure */

    if (pdevc == NULL) {
        /* No device color given, should not happen */
        gx_hld_saved_color_init(psc);	/* revert to unknown color */
        return false;
    } else if (pgs == NULL) {
        /* No color space, simply save device color specific info */
        psc->color_space_id = psc->pattern_id = gs_no_id;
        pdevc->type->save_dc(pdevc, &(psc->saved_dev_color));
        return false;
    } else {
        /*
         * Have color space, save id,  ccolor, & device color specific info.
         * Also save the high level colors since two gx_color_index values
         * may be the same but for differing high level colors (due to the
         * usual lower resolution of the gx_color_index values.
         */
        const gs_color_space * pcs = gs_currentcolorspace_inline(pgs);
        int i = gs_color_space_num_components(pcs);

        psc->color_space_id = pcs->id;
        pdevc->type->save_dc(pdevc, &(psc->saved_dev_color));
        if (pdevc->type == gx_dc_type_pattern2)
            i = 0;
        else if (i < 0)
            i = -i - 1; /* See gx_num_components_Pattern. */
        for (i--; i >= 0; i--)
            psc->ccolor.paint.values[i] = pdevc->ccolor.paint.values[i];

        /* Save the pattern id - if present */
        if ((pdevc->type == gx_dc_type_pattern
           || pdevc->type == gx_dc_type_pattern2) && pdevc->ccolor_valid)
            psc->pattern_id = pdevc->ccolor.pattern->pattern_id;
        else
            psc->pattern_id = gs_no_id;
        return true;
    }
}

/*
 * Compare two saved colors to check if match.
 * This routine used to be a simple memcmp(), but
 * that is insufficient, the checks must be explicit.
 */
bool gx_hld_saved_color_equal(const gx_hl_saved_color * psc1,
                           const gx_hl_saved_color * psc2)
{

    int i;

    if (psc1->saved_dev_color.type != psc2->saved_dev_color.type
     || psc1->color_space_id != psc2->color_space_id
     || psc1->pattern_id != psc2->pattern_id
     || psc1->ccolor_valid != psc2->ccolor_valid
     || psc1->ccolor.pattern != psc2->ccolor.pattern
     || psc1->saved_dev_color.phase.x != psc2->saved_dev_color.phase.x
     || psc1->saved_dev_color.phase.y != psc2->saved_dev_color.phase.y) {

        return(false);
    }

    /* early bailout for pattern comparison */
    if (gx_dc_is_pattern1_color((gx_device_color *)(&psc1->saved_dev_color.type))) {

        if (psc1->saved_dev_color.colors.pattern.id != psc2->saved_dev_color.colors.pattern.id)
            return(false);
        else
            return true;
    }
    if (gx_dc_is_pattern2_color((gx_device_color *)(&psc1->saved_dev_color.type))) {
        if (psc1->saved_dev_color.colors.pattern2.id != psc2->saved_dev_color.colors.pattern2.id
         || psc1->saved_dev_color.colors.pattern2.shfill != psc2->saved_dev_color.colors.pattern2.shfill)
            return(false);
        else
            return true;
    }

    for (i = 0; i < GX_DEVICE_COLOR_MAX_COMPONENTS; i++) {
        if (psc1->ccolor.paint.values[i] != psc2->ccolor.paint.values[i]) {
            return(false);
        }
    }
    /* NAFF: only gx_dc_pure_masked doesn't have a type checker */
    if (gx_dc_is_pure(&psc1->saved_dev_color) || psc1->saved_dev_color.type == &gx_dc_pure_masked) {
        if (psc1->saved_dev_color.colors.pure != psc2->saved_dev_color.colors.pure) {
            return(false);
        }
    }
    else if (gx_dc_is_binary_halftone(&psc1->saved_dev_color)) {

        if ((psc1->saved_dev_color.colors.binary.b_color[0] != psc2->saved_dev_color.colors.binary.b_color[0])
             || (psc1->saved_dev_color.colors.binary.b_color[1] != psc2->saved_dev_color.colors.binary.b_color[1])
             || (psc1->saved_dev_color.colors.binary.b_level != psc2->saved_dev_color.colors.binary.b_level)
             || (psc1->saved_dev_color.colors.binary.b_index != psc2->saved_dev_color.colors.binary.b_index)) {

            return(false);
        }
    }
    else if (gx_dc_is_colored_halftone(&psc1->saved_dev_color)) {

        for (i = 0; i < GX_DEVICE_COLOR_MAX_COMPONENTS; i++) {
            if (psc1->saved_dev_color.colors.colored.c_base[i] != psc2->saved_dev_color.colors.colored.c_base[i]
              || psc1->saved_dev_color.colors.colored.c_level[i] != psc2->saved_dev_color.colors.colored.c_level[i]) {

                return(false);
            }
        }
    }
    else if (gx_dc_is_devn(&psc1->saved_dev_color)) {

        for (i = 0; i < GX_DEVICE_COLOR_MAX_COMPONENTS; i++) {
             if (psc1->saved_dev_color.colors.devn.values[i] != psc2->saved_dev_color.colors.devn.values[i]) {

                 return(false);
             }
        }
    }

    return (true);
}

/*
 * Check whether two saved colors have same color space.
 */
bool gx_hld_saved_color_same_cspace(const gx_hl_saved_color * psc1,
                           const gx_hl_saved_color * psc2)
{
    if (psc1->color_space_id != psc2->color_space_id)
        return false;
    if (psc1->pattern_id != psc2->pattern_id)
        return false;
    if (psc1->ccolor_valid != psc2->ccolor_valid)
        return false;
    if (psc1->color_space_id != psc2->color_space_id)
        return false;
    return true;
}

/*
 * Check if a high level color is availavble.
 */
bool
gx_hld_is_hl_color_available(const gs_gstate * pgs,
                const gx_device_color * pdevc)
{
    if (pgs != NULL && pdevc != NULL && pdevc->type != gx_dc_type_null && pdevc->ccolor_valid)
        return true;
    return false;
}

/*
 * Get pointers to the current color space and client color.
 *
 * More description in src/gxhldevc.h
 */
gx_hld_get_color_space_and_ccolor_status
gx_hld_get_color_space_and_ccolor(const gs_gstate * pgs,
                const gx_device_color * pdevc, const gs_color_space ** ppcs,
                const gs_client_color ** ppcc)
{
    /* Check if the current color space was used to build the device color */
    if (gx_hld_is_hl_color_available(pgs, pdevc)) {
        const gs_color_space * pcs = gs_currentcolorspace_inline(pgs);

        *ppcs = pcs;
        *ppcc = &(pdevc->ccolor);
        if (pdevc->type == gx_dc_type_pattern
           || pdevc->type == &gx_dc_pure_masked
           || pdevc->type == gx_dc_type_pattern2)
            return pattern_color_space;
        else {
            return non_pattern_color_space;
        }
    }
    /* No color space */
    *ppcs = NULL;
    *ppcc = NULL;
    return use_process_color;
}

/*
 * Get the number of components in the current color space.
 *
 * More description in src/gxhldevc.h
 */
int
gx_hld_get_number_color_components(const gs_gstate * pgs)
{
    if (pgs != NULL) {
        const gs_color_space * pcs = gs_currentcolorspace_inline(pgs);
        int n = gs_color_space_num_components(pcs);

        return (n >= 0 ? n : -n - 1);
    } else
        return -1;
}

/*
 * Get the requested high level color value.
 *
 * More description in src/gxhldevc.h
 */
gx_hld_get_color_component_status
gx_hld_get_color_component(const gs_gstate * pgs,
                          const gx_device_color * pdevc,
                          int comp_num, float * output)
{
    if (pdevc != NULL && pdevc->ccolor_valid) {
        int ncomp = gx_hld_get_number_color_components(pgs);

        if (ncomp < 0)
            return invalid_color_info;
        if (comp_num < 0 || comp_num >= ncomp)
            return invalid_component_requested;
        *output = pdevc->ccolor.paint.values[comp_num];
        return valid_result;
    }
    return invalid_color_info;
}