/* Copyright (C) 2001-2025 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.

*/

/* Interpolated image procedures */

#include "gx.h"

#include "math_.h"

#include "memory_.h"

#include "stdint_.h"

#include "gpcheck.h"

#include "gserrors.h"

#include "gxfixed.h"

#include "gxfrac.h"

#include "gxarith.h"

#include "gxmatrix.h"

#include "gsccolor.h"

#include "gspaint.h"

#include "gxdevice.h"

#include "gxcmap.h"

#include "gxdcolor.h"

#include "gxgstate.h"

#include "gxdevmem.h"

#include "gxcpath.h"

#include "gximage.h"

#include "stream.h"             /* for s_alloc_state */

#include "siinterp.h"           /* for spatial interpolation */

#include "siscale.h"            /* for Mitchell filtering */

#include "sidscale.h"           /* for special case downscale filter */

#include "gscindex.h"           /* included for proper handling of index color spaces

                                and keeping data in source color space */

#include "gsbitops.h"

#include "gxcolor2.h"           /* define of float_color_to_byte_color */

#include "gscspace.h"           /* Needed for checking is space is CIE */

#include "gsicc_cache.h"

#include "gsicc_manage.h"

#include "gsicc.h"

#include "gxdevsop.h"

#include <limits.h>             /* For INT_MAX */

static void

decode_sample_frac_to_float(gx_image_enum *penum, frac sample_value, gs_client_color *cc, int i);

/*

 * Define whether we are using Mitchell filtering or spatial

 * interpolation to implement Interpolate.  (The latter doesn't work yet.)

 */

#define USE_MITCHELL_FILTER

/* ------ Strategy procedure ------ */

/* Check the prototype. */

iclass_proc(gs_image_class_0_interpolate);

/* If we're interpolating, use special logic.

   This function just gets interpolation stucture

   initialized and allocates buffer space if needed */

static irender_proc(image_render_interpolate);

static irender_proc(image_render_interpolate_icc);

static irender_proc(image_render_interpolate_masked);

static irender_proc(image_render_interpolate_masked_hl);

static irender_proc(image_render_interpolate_landscape);

static irender_proc(image_render_interpolate_landscape_icc);

static irender_proc(image_render_interpolate_landscape_masked);

static irender_proc(image_render_interpolate_landscape_masked_hl);

#if 0 /* Unused now, but potentially useful in the future */

static bool

is_high_level_device(gx_device *dev)

{

    char data[] = "HighLevelDevice";

    dev_param_req_t request;

    gs_c_param_list list;

    int highlevel = 0;

    int code;

    gs_c_param_list_write(&list, dev->memory);

    /* Stuff the data into a structure for passing to the spec_op */

    request.Param = data;

    request.list = &list;

    code = dev_proc(dev, dev_spec_op)(dev, gxdso_get_dev_param, &request, sizeof(dev_param_req_t));

    if (code < 0 && code != gs_error_undefined) {

        gs_c_param_list_release(&list);

        return 0;

    }

    gs_c_param_list_read(&list);

    code = param_read_bool((gs_param_list *)&list,

            "HighLevelDevice",

            &highlevel);

    gs_c_param_list_release(&list);

    if (code < 0)

        return 0;

    return highlevel;

}

#endif

static bool

device_allows_imagemask_interpolation(gx_device *dev)

{

    char data[] = "NoInterpolateImagemasks";

    dev_param_req_t request;

    gs_c_param_list list;

    bool nointerpolate = false;

    int code;

    gs_c_param_list_write(&list, dev->memory);

    /* Stuff the data into a structure for passing to the spec_op */

    request.Param = data;

    request.list = &list;

    code = dev_proc(dev, dev_spec_op)(dev, gxdso_get_dev_param, &request, sizeof(dev_param_req_t));

    if (code < 0 && code != gs_error_undefined) {

        gs_c_param_list_release(&list);

        return 0;

    }

    gs_c_param_list_read(&list);

    code = param_read_bool((gs_param_list *)&list,

            "NoInterpolateImagemasks",

            &nointerpolate);

    gs_c_param_list_release(&list);

    if (code < 0)

        return 0;

    return !nointerpolate;

}

#define DC_IS_NULL(pdc)\

  (gx_dc_is_pure(pdc) && (pdc)->colors.pure == gx_no_color_index)

/* Returns < 0 for error, 0 for pure color, 1 for high level */

static int mask_suitable_for_interpolation(gx_image_enum *penum)

{

    gx_device_color * const pdc1 = penum->icolor1;

    int code;

    int high_level_color = 1;

    if (gx_device_must_halftone(penum->dev))

        /* We don't interpolate when going to 1bpp outputs */

        return -1;

    if (dev_proc(penum->dev, dev_spec_op)(penum->dev, gxdso_copy_alpha_disabled, NULL, 0) == 1)

        /* The target device has copy_alpha() disabled. */

        return -1;

    if (gx_dc_is_pure(pdc1) && (pdc1)->colors.pure != gx_no_color_index &&

        dev_proc(penum->dev, copy_alpha) != NULL &&

        dev_proc(penum->dev, copy_alpha) != gx_no_copy_alpha) {

        /* We have a 'pure' color, and a valid copy_alpha. We can work with that. */

        high_level_color = 0;

    } else if (dev_proc(penum->dev, copy_alpha_hl_color) == gx_default_no_copy_alpha_hl_color) {

        /* No copy_alpha_hl_color. We're out of luck. */

        return -1;

    } else if ((code = gx_color_load(pdc1, penum->pgs, penum->dev)) < 0) {

        /* Otherwise we'll need to load the color value. If this gives an

         * error, we can't cope. */

        return -1;

    } else if (!gx_dc_is_devn(pdc1)) {

        /* If it's not a devn color, then we're really out of luck. */

        return -1;

    }

    /* Never turn this on for devices that disallow it (primarily

     * high level devices) */

    if (!device_allows_imagemask_interpolation(penum->dev))

        return -1;

    return high_level_color;

}

/*

    Helper function to take an int64_t, and "fixed2int_pixround_perfect"

    it while testing for overflow.

*/

static int

safe64fixed2int(int64_t v, int *overflow)

{

    if (v > (int)((1U<<(sizeof(int)*8-1))-128) ||

        v < 0)

        *overflow = 1;

    return fixed2int_pixround_perfect(v);

}

int

gs_image_class_0_interpolate(gx_image_enum * penum, irender_proc_t *render_fn)

{

    gs_memory_t *mem = penum->memory;

    stream_image_scale_params_t iss;

    stream_image_scale_state *pss;

    const stream_template *templat;

    byte *line;

    const gs_color_space *pcs = penum->pcs;

    uint in_size;

    bool use_icc = false;

    int num_des_comps;

    cmm_dev_profile_t *dev_profile;

    int code;

    gx_color_polarity_t pol = GX_CINFO_POLARITY_UNKNOWN;

    int mask_col_high_level = 0;

    int interpolate_control = penum->dev->interpolate_control;

    int abs_interp_limit = max(1, any_abs(interpolate_control));

    int limited_WidthOut, limited_HeightOut;

    int overflow = 0;

    if (interpolate_control < 0)

        penum->interpolate = interp_on;   /* not the same as "interp_force" -- threshold still used */

    if (interpolate_control == interp_off || penum->interpolate == interp_off) {

        penum->interpolate = interp_off;

        return 0;

    }

    if (penum->masked && (mask_col_high_level = mask_suitable_for_interpolation(penum)) < 0) {

        penum->interpolate = interp_off;

        return 0;

    }

    if (penum->use_mask_color ||

        (penum->posture != image_portrait &&

         penum->posture != image_landscape) ||

        penum->alpha) {

        /* We can't handle these cases yet.  Punt. */

        penum->interpolate = interp_off;

        return 0;

    }

    if (penum->Width == 0 || penum->Height == 0) {

        penum->interpolate = interp_off; /* No need to interpolate and      */

        return 0;                  /* causes division by 0 if we try. */

    }

    if (penum->Width == 1 && penum->Height == 1) {

        penum->interpolate = interp_off; /* No need to interpolate */

        return 0;

    }

    if (any_abs(penum->dst_width) < 0 || any_abs(penum->dst_height) < 0)

    {

        /* A calculation has overflowed. Bale */

        return 0;

    }

    if (penum->x_extent.x == INT_MIN || penum->x_extent.x == INT_MAX ||

        penum->x_extent.y == INT_MIN || penum->x_extent.y == INT_MAX ||

        penum->y_extent.x == INT_MIN || penum->y_extent.x == INT_MAX ||

        penum->y_extent.y == INT_MIN || penum->y_extent.y == INT_MAX)

    {

        /* A calculation has overflowed. Bail */

        return 0;

    }

    if (penum->masked) {

        abs_interp_limit = 1;   /* ignore this for masked images for now */

        use_icc = false;

        num_des_comps = 1;

        if (pcs)

            pol = cs_polarity(pcs);

        else

            pol = GX_CINFO_POLARITY_ADDITIVE;

    } else {

        if (pcs == NULL)

            return 0;   /* can't handle this */

        if (pcs->cmm_icc_profile_data != NULL) {

            use_icc = true;

        }

        if (pcs->type->index == gs_color_space_index_Indexed) {

            if (pcs->base_space->cmm_icc_profile_data != NULL) {

                use_icc = true;

            }

        }

        if (!(penum->bps <= 8 || penum->bps == 16)) {

            use_icc = false;

        }

        /* Do not allow mismatch in devices component output with the

           profile output size.  For example sep device with CMYK profile should

           not go through the fast method */

        code = dev_proc(penum->dev, get_profile)(penum->dev, &dev_profile);

        if (code) {

            penum->interpolate = interp_off;

            return 0;

        }

        num_des_comps = gsicc_get_device_profile_comps(dev_profile);

        if (num_des_comps != penum->dev->color_info.num_components ||

            dev_profile->usefastcolor == true) {

            use_icc = false;

        }

        /* If the device has some unique color mapping procs due to its color space,

           then we will need to use those and go through pixel by pixel instead

           of blasting through buffers.  This is true for example with many of

           the color spaces for CUPs */

        if(!gx_device_uses_std_cmap_procs(penum->dev, penum->pgs)) {

            use_icc = false;

        }

        pol = cs_polarity(pcs);

    }

/*

 * USE_CONSERVATIVE_INTERPOLATION_RULES is normally NOT defined since

 * the MITCHELL digital filter seems OK as long as we are going out to

 * a device that can produce > 15 shades.

 */

#if defined(USE_MITCHELL_FILTER) && defined(USE_CONSERVATIVE_INTERPOLATION_RULES)

    /*

     * We interpolate using a digital filter, rather than Adobe's

     * spatial interpolation algorithm: this produces very bad-looking

     * results if the input resolution is close to the output resolution,

     * especially if the input has low color resolution, so we resort to

     * some hack tests on the input color resolution and scale to suppress

     * interpolation if we think the result would look especially bad.

     * If we used Adobe's spatial interpolation approach, we wouldn't need

     * to do this, but the spatial interpolation filter doesn't work yet.

     */

    if (penum->bps < 4 || penum->bps * penum->spp < 8 ||

        (fabs(penum->matrix.xx) <= 5 && fabs(penum->matrix.yy <= 5))

        ) {

        penum->interpolate = interp_off;

        return 0;

    }

#endif

    iss.abs_interp_limit = abs_interp_limit;

    if (penum->masked) {

        iss.BitsPerComponentOut = 8;

        iss.MaxValueOut = 0xff;

    } else if (use_icc) {

        iss.BitsPerComponentOut = 16;

        iss.MaxValueOut = 0xffff;

    } else {

        iss.BitsPerComponentOut = sizeof(frac) * 8;

        iss.MaxValueOut = frac_1;

    }

    iss.PatchWidthIn = penum->drect.w;

    iss.PatchHeightIn = penum->drect.h;

    iss.LeftMarginIn = penum->drect.x - penum->rect.x;

    iss.TopMarginIn = penum->drect.y - penum->rect.y;

    if (penum->posture == image_portrait) {

        fixed dw = any_abs(penum->dst_width);

        fixed dh = any_abs(penum->dst_height);

        iss.WidthOut = safe64fixed2int((int64_t)(penum->rect.x + penum->rect.w) *

                                       dw / penum->Width, &overflow)

                     - safe64fixed2int((int64_t)penum->rect.x *

                                       dw / penum->Width, &overflow);

        iss.HeightOut = safe64fixed2int((int64_t)(penum->rect.y + penum->rect.h) *

                                        dh / penum->Height, &overflow)

                      - safe64fixed2int((int64_t)penum->rect.y *

                                        dh / penum->Height, &overflow);

        iss.EntireWidthOut = safe64fixed2int(dw, &overflow);

        iss.EntireHeightOut = safe64fixed2int(dh, &overflow);

        iss.TopMarginOut = safe64fixed2int((int64_t)(penum->rrect.y - penum->rect.y) *

                                           dh / penum->Height, &overflow);

        iss.PatchHeightOut = safe64fixed2int((int64_t)penum->rrect.h *

                                             dh / penum->Height, &overflow)

                           - iss.TopMarginOut;

        iss.PatchWidthOut = safe64fixed2int((int64_t)(penum->rrect.x + penum->rrect.w) *

                                            dw / penum->Width, &overflow)

                          - safe64fixed2int((int64_t)penum->rrect.x *

                                            dw / penum->Width, &overflow);

        iss.LeftMarginOut = safe64fixed2int((int64_t)(penum->rrect.x - penum->rect.x) *

                                            dw / penum->Width, &overflow);

        iss.TopMarginOut2 = safe64fixed2int((int64_t)penum->rrect.y *

                                            dh / penum->Height, &overflow);

        iss.PatchHeightOut2 = safe64fixed2int((int64_t)(penum->rrect.y + penum->rrect.h) *

                                              dh / penum->Height, &overflow)

                           - iss.TopMarginOut2;

        iss.pad_y = iss.TopMarginOut2

                  - safe64fixed2int((int64_t)penum->rect.y *

                                    dh / penum->Height, &overflow);

    } else {

        fixed dw = any_abs(penum->dst_width);

        fixed dh = any_abs(penum->dst_height);

        iss.WidthOut = safe64fixed2int((int64_t)(penum->rect.x + penum->rect.w) *

                                       dh / penum->Width, &overflow)

                     - safe64fixed2int((int64_t)penum->rect.x *

                                       dh / penum->Width, &overflow);

        iss.HeightOut = safe64fixed2int((int64_t)(penum->rect.y + penum->rect.h) *

                                        dw / penum->Height, &overflow)

                      - safe64fixed2int((int64_t)penum->rect.y *

                                        dw / penum->Height, &overflow);

        iss.EntireWidthOut = safe64fixed2int(dh, &overflow);

        iss.EntireHeightOut = safe64fixed2int(dw, &overflow);

        iss.TopMarginOut = safe64fixed2int((int64_t)(penum->rrect.y - penum->rect.y) *

                                           dw / penum->Height, &overflow);

        iss.PatchHeightOut = safe64fixed2int((int64_t)penum->rrect.h *

                                             dw / penum->Height, &overflow)

                           - iss.TopMarginOut;

        iss.PatchWidthOut = safe64fixed2int((int64_t)(penum->rrect.x + penum->rrect.w) *

                                            dh / penum->Width, &overflow)

                          - safe64fixed2int((int64_t)penum->rrect.x *

                                            dh / penum->Width, &overflow);

        iss.LeftMarginOut = safe64fixed2int((int64_t)(penum->rrect.x - penum->rect.x) *

                                            dh / penum->Width, &overflow);

        iss.TopMarginOut2 = safe64fixed2int((int64_t)penum->rect.y *

                                            dw / penum->Height, &overflow);

        iss.PatchHeightOut2 = safe64fixed2int((int64_t)(penum->rrect.y + penum->rrect.h) *

                                              dw / penum->Height, &overflow)

                           - iss.TopMarginOut2;

        iss.pad_y = 0;

    }

    iss.PatchWidthOut = any_abs(iss.PatchWidthOut);

    if (iss.LeftMarginOut + iss.PatchWidthOut >= iss.WidthOut) {

        iss.LeftMarginOut = iss.WidthOut - iss.PatchWidthOut;

        if (iss.LeftMarginOut < 0) {

            iss.WidthOut += iss.LeftMarginOut;

            iss.LeftMarginOut = 0;

        }

    }

    iss.src_y_offset = penum->rect.y;

    iss.EntireWidthIn = penum->Width;

    iss.EntireHeightIn = penum->Height;

    iss.WidthIn = penum->rect.w;

    iss.HeightIn = penum->rect.h;

    iss.WidthOut = any_abs(iss.WidthOut);

    iss.HeightOut = any_abs(iss.HeightOut);

    limited_WidthOut = (iss.WidthOut + abs_interp_limit - 1)/abs_interp_limit;

    limited_HeightOut = (iss.HeightOut + abs_interp_limit - 1)/abs_interp_limit;

    if ((penum->posture == image_portrait ? penum->dst_width : penum->dst_height) < 0)

        iss.LeftMarginOut = iss.WidthOut - iss.LeftMarginOut - iss.PatchWidthOut;

    /* For interpolator cores that don't set Active, have us always active */

    iss.Active = 1;

    if (iss.EntireWidthOut == 0 || iss.EntireHeightOut == 0 || overflow)

    {

        penum->interpolate = interp_off;

        return 0;

    }

    if (penum->masked) {

        iss.spp_decode = 1;

    } else {

        /* If we are in an indexed space then we need to use the number of components

           in the base space.  Otherwise we use the number of components in the source space */

        if (pcs->type->index == gs_color_space_index_Indexed) {

           /* Use the number of colors in the base space */

            iss.spp_decode = cs_num_components(pcs->base_space);

        } else {

            /* Use the number of colors that exist in the source space

            as this is where we are doing our interpolation */

            iss.spp_decode = cs_num_components(pcs);

        }

    }

    /* Set up the filter template. May be changed for "Special" downscaling */

#ifdef USE_MITCHELL_FILTER

    templat = &s_IScale_template;

#else

    templat = &s_IIEncode_template;

#endif

    if ((iss.WidthOut < iss.WidthIn) &&

        (iss.HeightOut < iss.HeightIn) &&       /* downsampling */

        (pol != GX_CINFO_POLARITY_UNKNOWN) &&

        (dev_proc(penum->dev, dev_spec_op)(penum->dev, gxdso_interpolate_antidropout, NULL, 0) > 0)) {

        /* Special case handling for when we are downsampling to a dithered

        * device.  The point of this non-linear downsampling is to preserve

        * dark pixels from the source image to avoid dropout. The color

        * polarity is used for this. */

        templat = &s_ISpecialDownScale_template;

    } else {

        /* No interpolation unless we exceed the device selected minimum */

        int threshold = dev_proc(penum->dev, dev_spec_op)(penum->dev, gxdso_interpolate_threshold, NULL, 0);

        if ((iss.WidthOut == iss.WidthIn && iss.HeightOut == iss.HeightIn) ||

            ((penum->interpolate != interp_force) &&

                (threshold > 0) &&

                (iss.WidthOut < iss.WidthIn * threshold) &&

                (iss.HeightOut < iss.HeightIn * threshold))) {

            penum->interpolate = interp_off;

            return 0;       /* don't interpolate if not scaled up enough */

        }

    }

    /* The SpecialDownScale filter needs polarity, either ADDITIVE or SUBTRACTIVE */

    /* UNKNOWN case (such as for palette colors) has been handled above */

    iss.ColorPolarityAdditive = (pol == GX_CINFO_POLARITY_ADDITIVE);

    if (iss.HeightOut > iss.EntireHeightIn && use_icc) {

        iss.early_cm = true;

        iss.spp_interp = num_des_comps;

    } else {

        iss.early_cm = false;

        iss.spp_interp = iss.spp_decode;

    }

    if (penum->bps <= 8 ) {

       /* If the input is ICC or other device independent format, go ahead

          and do the interpolation in that space.

          If we have more than 8 bits per channel then we will need to

          handle that in a slightly different manner so

          that the interpolation algorithm handles it properly.

          The interpolation will still be in the source

          color space.  Note that if image data was less the 8 bps

          It is handed here to us in 8 bit form already decoded. */

        iss.BitsPerComponentIn = 8;

        iss.MaxValueIn = 0xff;

        if (penum->masked) {

            in_size = iss.WidthIn * iss.spp_decode;

        } else {

            /* We either use the data as is, or allocate space if it is

               reversed in X or if the colorspace requires it */

            /* Do we need a buffer for reversing each scan line? */

            bool reverse = (penum->posture == image_portrait ?

                            penum->matrix.xx : penum->matrix.xy) < 0;

            in_size = (reverse ? iss.WidthIn * iss.spp_decode : 0);

            /* If it is not reversed, and we have 8 bit/color channel data then

               we may not need to allocate extra as we will use the source directly.

               However, if we have a nonstandard encoding and are in a device

               color space we will need to allocate in that case also. We will

               maintain 8 bits but do the decode and then interpolate.

               This is OK for the linear decode

            */

            if (!penum->device_color ||  pcs->type->index > gs_color_space_index_DeviceCMYK) {

                in_size = iss.WidthIn * iss.spp_decode;

            }

        }

    } else {

        /* If it has more than 8 bits per color channel then we will go to frac

           for the interpolation to mantain precision or 16 bit for icc  */

        if (use_icc) {

            iss.BitsPerComponentIn = 16;

            iss.MaxValueIn = 0xffff;

        } else {

            iss.BitsPerComponentIn = sizeof(frac) * 8;

            iss.MaxValueIn = frac_1;

        }

        in_size = round_up(iss.WidthIn * iss.spp_decode * (int)sizeof(frac),

                           align_bitmap_mod);

        /* Size to allocate space to store the input as frac type */

    }

    /* Allocate a buffer for one source/destination line.     */

    /* NB: The out_size is for full device res, regardless of abs_interp_limit  */

    /*     since we will expand into that area in the x-loop      */

    {

        uint out_size = iss.WidthOut * max(iss.spp_interp * ((iss.BitsPerComponentOut) / 8),

                                   ARCH_SIZEOF_COLOR_INDEX);

        /* Allocate based upon frac size (as BitsPerComponentOut=16) output scan

           line input plus output. The outsize may have an adjustment for

           word boundary on it. Need to account for that now */

        out_size += align_bitmap_mod;

        line = gs_alloc_bytes(mem, in_size + out_size,

                              "image scale src+dst line");

    }

    pss = (stream_image_scale_state *)

        s_alloc_state(mem, templat->stype, "image scale state");

    if (line == 0 || pss == 0 ||

        (pss->params = iss, pss->templat = templat,

         (*pss->templat->init) ((stream_state *) pss) < 0)

        ) {

        gs_free_object(mem, pss, "image scale state");

        gs_free_object(mem, line, "image scale src+dst line");

        /* Try again without interpolation. */

        penum->interpolate = interp_off;

        return 0;

    }

    penum->line = line;  /* Set to the input and output buffer */

    penum->scaler = pss;

    penum->line_xy = 0;

    if (penum->posture == image_portrait) {

        gx_dda_fixed x0;

        x0 = penum->dda.pixel0.x;

        /* We always plot from left to right. If the matrix would have us

         * plotting from right to left, then adjust to allow for the fact

         * we'll flip the data later. */

        if (penum->matrix.xx < 0)

            dda_advance(x0, penum->rect.w);

        penum->xyi.x = fixed2int_pixround(dda_current(x0)) + pss->params.LeftMarginOut;

        penum->xyi.y = penum->yi0 + fixed2int_pixround_perfect(

                                 (fixed)((int64_t)penum->rect.y *

                                         penum->dst_height / penum->Height));

    } else /* penum->posture == image_landscape */ {

        /* We always plot from top to bottom. If the matrix would have us

         * plotting from bottom to top, then adjust to allow for the fact

         * we'll flip the data later. */

        int x0 = penum->rrect.x;

        if (penum->matrix.xy < 0)

            x0 += penum->rrect.w;

        penum->xyi.x = fixed2int_pixround(dda_current(penum->dda.pixel0.x));

        penum->xyi.y = penum->yi0 + fixed2int_pixround_perfect(

                                 (fixed)((int64_t)x0 *

                                         penum->dst_height / penum->Width));

    }

    /* If the InterpolationControl specifies interpolation to less than full device res */

    /* Set up a scaling DDA to control scaling back to desired image size.    */

    if (abs_interp_limit > 1) {

        dda_init(pss->params.scale_dda.x, 0, iss.WidthOut, limited_WidthOut);

        dda_init(pss->params.scale_dda.y, 0, iss.HeightOut, limited_HeightOut);

    }

    if_debug0m('b', penum->memory, "[b]render=interpolate\n");

    if (penum->masked) {

        if (!mask_col_high_level) {

            *render_fn = (penum->posture == image_portrait ?

                    &image_render_interpolate_masked :

                    &image_render_interpolate_landscape_masked);

            return 0;

        } else {

            *render_fn = (penum->posture == image_portrait ?

                    &image_render_interpolate_masked_hl :

                    &image_render_interpolate_landscape_masked_hl);

            return 0;

        }

    } else if (use_icc) {

        /* Set up the link now */

        const gs_color_space *pcs;

        gsicc_rendering_param_t rendering_params;

        int k;

        int src_num_comp = cs_num_components(penum->pcs);

        penum->icc_setup.need_decode = false;

        /* Check if we need to do any decoding.  If yes, then that will slow us down */

        for (k = 0; k < src_num_comp; k++) {

            if ( penum->map[k].decoding != sd_none ) {

                penum->icc_setup.need_decode = true;

                break;

            }

        }

        /* Define the rendering intents */

        rendering_params.black_point_comp = penum->pgs->blackptcomp;

        rendering_params.graphics_type_tag = GS_IMAGE_TAG;

        rendering_params.override_icc = false;

        rendering_params.preserve_black = gsBKPRESNOTSPECIFIED;

        rendering_params.rendering_intent = penum->pgs->renderingintent;

        rendering_params.cmm = gsCMM_DEFAULT;

        if (gs_color_space_is_PSCIE(penum->pcs) && penum->pcs->icc_equivalent != NULL) {

            pcs = penum->pcs->icc_equivalent;

        } else {

            /* Look for indexed space */

            if ( penum->pcs->type->index == gs_color_space_index_Indexed) {

                pcs = penum->pcs->base_space;

            } else {

                pcs = penum->pcs;

            }

        }

        penum->icc_setup.is_lab = pcs->cmm_icc_profile_data->islab;

        if (penum->icc_setup.is_lab) penum->icc_setup.need_decode = false;

        penum->icc_setup.must_halftone = gx_device_must_halftone(penum->dev);

        penum->icc_setup.has_transfer =

            gx_has_transfer(penum->pgs, num_des_comps);

        if (penum->icc_link == NULL) {

            penum->icc_link = gsicc_get_link(penum->pgs, penum->dev, pcs, NULL,

                &rendering_params, penum->memory);

        }

        /* We need to make sure that we do the proper unpacking proc if we

           are doing 16 bit */

        if (penum->bps == 16) {

            penum->unpack = sample_unpackicc_16;

        }

        *render_fn = (penum->posture == image_portrait ?

                &image_render_interpolate_icc :

                &image_render_interpolate_landscape_icc);

        return 0;

    } else {

        /* If we are doing fastcolor we may still have

           a decode situation.  To avoid yet another

           variable, use the existing one in the

           icc setup */

        if (dev_profile->usefastcolor) {

            int k;

            int src_num_comp = cs_num_components(penum->pcs);

            penum->icc_setup.need_decode = false;

            /* Check if we need to do any decoding.  If yes, then that will slow us down */

            for (k = 0; k < src_num_comp; k++) {

                if ( penum->map[k].decoding != sd_none ) {

                    penum->icc_setup.need_decode = true;

                    break;

                }

            }

        }

        *render_fn = (penum->posture == image_portrait ?

                &image_render_interpolate :

                &image_render_interpolate_landscape);

        return 0;

    }

}

/* ------ Rendering for interpolated images ------ */

/* This does some initial required decoding of index spaces and general

   decoding of odd scaled image data needed prior to interpolation or

   application of color management. */

static void

initial_decode(gx_image_enum * penum, const byte * buffer, int data_x, int h,

               stream_cursor_read *stream_r, bool is_icc)

{

    stream_image_scale_state *pss = penum->scaler;

    const gs_color_space *pcs = penum->pcs;

    int spp_decode = pss->params.spp_decode;

    byte *out = penum->line;

    bool need_decode;

    int reversed =

        (penum->posture == image_portrait ? penum->matrix.xx : penum->matrix.xy) < 0;

    /* If cs is neither a device color nor a CIE color then for an image case

       it is going to be deviceN, sep, or index. */

    bool is_devn_sep_index =

        (!(penum->device_color) && !gs_color_space_is_CIE(pcs));

    /* Determine if we need to perform any decode procedures */

    if (is_icc) {

        /* In icc case, decode upfront occurs if specified by icc setup or if

           cs is neither a device color nor a CIE color (i.e. if it's DeviceN,

           Index or Separation) The color space cannot be a pattern for an image */

        need_decode = (penum->icc_setup.need_decode || is_devn_sep_index);

    } else {

        cmm_dev_profile_t *dev_profile;

        dev_proc(penum->dev, get_profile)(penum->dev, &dev_profile);

        if (dev_profile != NULL && dev_profile->usefastcolor)

            need_decode = (penum->icc_setup.need_decode || is_devn_sep_index);

        else

            need_decode = is_devn_sep_index;

    }

    if (h != 0) {

        /* Convert the unpacked data to concrete values in the source buffer. */

        int sizeofPixelIn = pss->params.BitsPerComponentIn / 8;

        uint row_size = pss->params.WidthIn * spp_decode * sizeofPixelIn;

        /* raw input data */

        const int raw_size = (pcs != NULL && pcs->type->index == gs_color_space_index_Indexed ?

                              1 : spp_decode);

        const unsigned char *bdata = buffer + data_x * raw_size * sizeofPixelIn;

        /* We have the following cases to worry about

          1) Device 8 bit color but not indexed (e.g. ICC).

             Apply CMM after interpolation if needed.

             Also if ICC CIELAB do not do a decode operation

          2) Indexed 8 bit color.  Get to the base space. We will then be in

             the same state as 1.

          3) 16 bit not indexed.  Remap after interpolation.

          4) Indexed 16bit color.   Get to base space in 16bit form. We

             will then be in same state as 3.

         */

        if (sizeofPixelIn == 1) {

            if (pcs == NULL || pcs->type->index != gs_color_space_index_Indexed) {

                /* An issue here is that we may not be "device color" due to

                   how the data is encoded.  Need to check for that case here */

                /* Decide here if we need to decode or not. Essentially, as

                 * far as I can gather, we use the top case if we DON'T need

                 * to decode. This is fairly obviously conditional on

                 * need_decode being set to 0. The major exception to this is

                 * that if the colorspace is CIE, we interpolate, THEN decode,

                 * so the decode is done later in the pipeline, so we needn't

                 * decode here (see Bugs 692225 and 692331). */

                if (!need_decode) {

                    /* 8-bit color values, possibly device  indep. or device

                       depend., not indexed. Decode range was [0 1] */

                    if (!reversed) {

                        /* Use the input data directly. sets up data in the

                           stream buffer structure */

                        stream_r->ptr = bdata - 1;

                    } else {

                        /* Mirror the data in X. */

                        const byte *p = bdata + row_size - spp_decode;

                        byte *q = out;

                        int i;

                        for (i = 0; i < pss->params.WidthIn;

                            p -= spp_decode, q += spp_decode, ++i)

                            memcpy(q, p, spp_decode);

                        stream_r->ptr = out - 1;

                    }

                } else {

                    /* We need to do some decoding. Data will remain in 8 bits

                       This does not occur if color space was CIE encoded.

                       Then we do the decode during concretization which occurs

                       after interpolation */

                    int dc = penum->spp;

                    const byte *pdata = bdata;

                    byte *psrc = (byte *) penum->line;

                    int i, j;

                    int dpd = dc;

                    gs_client_color cc;

                    /* Go backwards through the data */

                    if (reversed) {

                        pdata += (pss->params.WidthIn - 1) * dpd;

                        dpd = - dpd;

                    }

                    stream_r->ptr = (byte *) psrc - 1;

                    for (i = 0; i < pss->params.WidthIn; i++, psrc += spp_decode) {

                        /* Do the decode but remain in 8 bits */

                        for (j = 0; j < dc;  ++j) {

                            decode_sample(pdata[j], cc, j);

                            psrc[j] = float_color_to_byte_color(cc.paint.values[j]);

                        }

                        pdata += dpd;

                    }

                }

            } else {

                /* indexed 8 bit color values, possibly a device indep. or

                   device depend. base space. We need to get out of the indexed

                   space and into the base color space. Note that we need to

                   worry about the decode function for the index values. */

                int bps = penum->bps;

                int dc = penum->spp;

                const byte *pdata = bdata; /* Input buffer */

                unsigned char *psrc = (unsigned char *) penum->line;  /* Output */

                int i;

                int dpd = dc * (bps <= 8 ? 1 : sizeof(frac));

                float max_range;

                /* Get max of decode range */

                max_range = (penum->map[0].decode_factor < 0 ?

                    penum->map[0].decode_base :

                penum->map[0].decode_base + 255.0 * penum->map[0].decode_factor);

                /* flip the horizontal direction if indicated by the matrix value */

                if (reversed) {

                    pdata += (pss->params.WidthIn - 1) * dpd;

                    dpd = - dpd;

                }

                stream_r->ptr = (byte *) psrc - 1;

                for (i = 0; i < pss->params.WidthIn; i++, psrc += spp_decode) {

                    /* Let's get directly to a decoded byte type loaded into

                       psrc, and do the interpolation in the source space. Then

                       we will do the appropriate remap function after

                       interpolation. */

                    /* First we need to get the properly decoded value. */

                    float decode_value;

                    switch ( penum->map[0].decoding )

                    {

                        case sd_none:

                         /* while our indexin is going to be 0 to 255.0 due to

                            what is getting handed to us, the range of our

                            original data may not have been as such and we may

                            need to rescale, to properly lookup at the correct

                            location (or do the proc correctly) during the index

                            look-up.  This occurs even if decoding was set to

                            sd_none.  */

                            decode_value = (float) pdata[0] * (float)max_range / 255.0;

                            break;

                        case sd_lookup:

                            decode_value =

                              (float) penum->map[0].decode_lookup[pdata[0] >> 4];

                            break;

                        case sd_compute:

                            decode_value =

                              penum->map[0].decode_base +

                              ((float) pdata[0]) * penum->map[0].decode_factor;

                            break;

                        default:

                            decode_value = 0; /* Quiet gcc warning. */

                    }

                    gs_cspace_indexed_lookup_bytes(pcs, decode_value,psrc);

                    pdata += dpd;    /* Can't have just ++

                                        since we could be going backwards */

                }

            }

        } else {

            /* More than 8-bits/color values */

            /* Even in this case we need to worry about an indexed color space.

               We need to get to the base color space for the interpolation and

               then if necessary do the remap to the device space */

            if (pcs == NULL || pcs->type->index != gs_color_space_index_Indexed) {

                int bps = penum->bps;

                int dc = penum->spp;

                const byte *pdata = bdata;

                frac *psrc = (frac *) penum->line;

                int i, j;

                int dpd = dc * (bps <= 8 ? 1 : sizeof(frac));

                if (reversed) {

                    pdata += (pss->params.WidthIn - 1) * dpd;

                    dpd = - dpd;

                }

                stream_r->ptr = (byte *) psrc - 1;

                if_debug0m('B', penum->memory, "[B]Remap row:\n[B]");

                if (is_icc) {

                    if (reversed) {

                        byte *to = penum->line;

                        for (i = 0; i < pss->params.WidthIn; i++) {

                            memcpy(to, pdata, -dpd);

                            to -= dpd;

                            pdata += dpd;

                        }

                    } else {

                        stream_r->ptr = (byte *) pdata - 1;

                    }

                } else {

                    if (sizeof(frac) * dc == dpd) {

                        stream_r->ptr = (byte *) pdata - 1;

                    } else {

                        for (i = 0; i < pss->params.WidthIn; i++,

                             psrc += spp_decode) {

                            for (j = 0; j < dc; ++j) {

                                psrc[j] = ((const frac *)pdata)[j];

                            }

                            pdata += dpd;

    #ifdef DEBUG

                            if (gs_debug_c('B')) {

                                int ci;

                                for (ci = 0; ci < spp_decode; ++ci)

                                    dmprintf2(penum->memory, "%c%04x", (ci == 0 ? ' ' : ','), psrc[ci]);

                            }

    #endif

                        }

                    }

                }

                if_debug0m('B', penum->memory, "\n");

            } else {

                /* indexed and more than 8bps.  Need to get to the base space */

                int bps = penum->bps;

                int dc = penum->spp;

                const byte *pdata = bdata; /* Input buffer */

                frac *psrc = (frac *) penum->line;    /* Output buffer */

                int i;

                int dpd = dc * (bps <= 8 ? 1 : sizeof(frac));

                float decode_value;

                /* flip the horizontal direction if indicated by the matrix value */

                if (reversed) {

                    pdata += (pss->params.WidthIn - 1) * dpd;

                    dpd = - dpd;

                }

                stream_r->ptr = (byte *) psrc - 1;

                for (i = 0; i < pss->params.WidthIn; i++, psrc += spp_decode) {

                    /* Lets get the decoded value. Then we need to do the lookup

                       of this */

                    decode_value = penum->map[0].decode_base +

                        (((const frac *)pdata)[0]) * penum->map[0].decode_factor;

                    /* Now we need to do the lookup of this value, and stick it

                       in psrc as a frac, which is what the interpolator is

                       expecting, since we had more than 8 bits of original

                       image data */

                    gs_cspace_indexed_lookup_frac(pcs, decode_value,psrc);

                    pdata += dpd;