/* Copyright (C) 2001-2024 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.

*/

/* Low-level bitmap image handling for PDF-writing driver */

#include "string_.h"

#include "gx.h"

#include "gserrors.h"

#include "gdevpdfx.h"

#include "gdevpdfg.h"

#include "gdevpdfo.h"                /* for data stream */

#include "gxcspace.h"

#include "gxdcolor.h"

#include "gxpcolor.h"

#include "gxhldevc.h"

#include "gxchar.h"

#include "gdevpdtf.h"                /* Required to include gdevpdti.h */

#include "gdevpdti.h"                /* For pdf_charproc_x_offset */

#include "gsptype1.h"

#include "gdevpdtt.h"

/* We need this color space type for constructing temporary color spaces. */

extern const gs_color_space_type gs_color_space_type_Indexed;

/* ---------------- Utilities ---------------- */

/* Fill in the image parameters for a bitmap image. */

static void

pdf_make_bitmap_image(gs_image_t * pim, int x, int y, int w, int h)

{

    pim->Width = w;

    pim->Height = h;

    pdf_make_bitmap_matrix(&pim->ImageMatrix, x, y, w, h, h);

}

/* ---------------- Driver procedures ---------------- */

/* Copy a mask bitmap.  for_pattern = -1 means put the image in-line, */

/* 1 means put the image in a resource. */

static int

pdf_copy_mask_data(gx_device_pdf * pdev, const byte * base, int sourcex,

                   int raster, gx_bitmap_id id, int x, int y, int w, int h,

                   gs_image_t *pim, pdf_image_writer *piw,

                   int for_pattern)

{

    uint64_t nbytes;

    int code;

    const byte *row_base;

    int row_step;

    bool in_line;

    gs_image_t_init_mask(pim, true);

    pdf_make_bitmap_image(pim, x, y, w, h);

    nbytes = ((uint64_t)w * h + 7) / 8;

    if (for_pattern) {

        /*

         * Patterns must be emitted in order of increasing user Y, i.e.,

         * the opposite of PDF's standard image order.

         */

        row_base = base + (h - 1) * raster;

        row_step = -raster;

        in_line = for_pattern < 0;

    } else {

        row_base = base;

        row_step = raster;

        in_line = nbytes < pdev->MaxInlineImageSize;

        pdf_put_image_matrix(pdev, &pim->ImageMatrix, 1.0);

        /*

         * Check whether we've already made an XObject resource for this

         * image.

         */

        if (id != gx_no_bitmap_id) {

            piw->pres = pdf_find_resource_by_gs_id(pdev, resourceXObject, id);

            if (piw->pres)

                return 0;

        }

    }

    /*

     * We have to be able to control whether to put Pattern images in line,

     * to avoid trying to create an XObject resource while we're in the

     * middle of writing a Pattern resource.

     */

    if (for_pattern < 0)

        stream_puts(pdev->strm, "q ");

    pdf_image_writer_init(piw);

    pdev->ParamCompatibilityLevel = pdev->CompatibilityLevel;

    if ((code = pdf_begin_write_image(pdev, piw, id, w, h, NULL, in_line)) < 0 ||

        (code = psdf_setup_lossless_filters((gx_device_psdf *) pdev,

                                            &piw->binary[0],

                                            (gs_pixel_image_t *)pim, in_line)) < 0 ||

        (code = pdf_begin_image_data(pdev, piw, (const gs_pixel_image_t *)pim,

                                     NULL, 0)) < 0

        )

        return code;

    pdf_copy_mask_bits(piw->binary[0].strm, row_base, sourcex, row_step, w, h, 0);

    pdf_end_image_binary(pdev, piw, piw->height);

    return pdf_end_write_image(pdev, piw);

}

static void

set_image_color(gx_device_pdf *pdev, gx_color_index c)

{

    pdf_set_pure_color(pdev, c, &pdev->saved_fill_color,

                        &pdev->fill_used_process_color,

                        &psdf_set_fill_color_commands);

    if (!pdev->HaveStrokeColor)

        pdf_set_pure_color(pdev, c, &pdev->saved_stroke_color,

                            &pdev->stroke_used_process_color,

                            &psdf_set_stroke_color_commands);

}

static int

pdf_copy_mono(gx_device_pdf *pdev,

              const byte *base, int sourcex, int raster, gx_bitmap_id id,

              int x, int y, int w, int h, gx_color_index zero,

              gx_color_index one, const gx_clip_path *pcpath)

{

    int code;

    gs_color_space *pcs = NULL;

    cos_value_t cs_value;

    cos_value_t *pcsvalue;

    byte palette[ARCH_SIZEOF_COLOR_INDEX * 2];

    gs_image_t image;

    pdf_image_writer writer;

    pdf_stream_position_t ipos;

    pdf_resource_t *pres = 0;

    byte invert = 0;

    bool in_line = false, char_proc_begun = false;

    gs_show_enum *show_enum = (gs_show_enum *)pdev->pte;

    int x_offset, y_offset;

    double width;

    /* Update clipping. */

    if (pdf_must_put_clip_path(pdev, pcpath)) {

        code = pdf_open_page(pdev, PDF_IN_STREAM);

        if (code < 0)

            return code;

        code = pdf_put_clip_path(pdev, pcpath);

        if (code < 0)

            return code;

    }

    /* We have 3 cases: mask, inverse mask, and solid. */

    if (zero == gx_no_color_index) {

        if (one == gx_no_color_index)

            return 0;

        /* If a mask has an id, assume it's a character. */

        if (id != gx_no_bitmap_id && sourcex == 0 && show_enum) {

            pdf_char_proc_t *pcp;

            if (show_enum->use_wxy_float)

                pdev->char_width.x = show_enum->wxy_float.x;

            else

                pdev->char_width.x = fixed2float(show_enum->wxy.x);

            pres = pdf_find_resource_by_gs_id(pdev, resourceCharProc, id);

            if (pres == 0) {        /* Define the character in an embedded font. */

                gs_image_t_init_mask(&image, false);

                invert = 0xff;

                x_offset = x - (int)show_enum->pgs->current_point.x;

                y_offset = y - (int)show_enum->pgs->current_point.y;

                x -= x_offset;

                y -= y_offset;

                y -= h;

                pdf_make_bitmap_image(&image, x, y, w, h);

                /*

                 * The Y axis of the text matrix is inverted,

                 * so we need to negate the Y offset appropriately.

                 */

                code = pdf_begin_char_proc(pdev, w, h, 0, y_offset, x_offset, id,

                                           &pcp, &ipos);

                if (code < 0)

                    return code;

                char_proc_begun = true;

                y_offset = -y_offset;

                width = psdf_round(pdev->char_width.x, 100, 10); /* See

                        pdf_write_Widths about rounding. We need to provide

                        a compatible data for Tj. */

                pprintg1(pdev->strm, "%g ", width);

                pprintd4(pdev->strm, "0 %d %d %d %d d1\n",  x_offset, -h + y_offset, w + x_offset, y_offset);

                pprintd4(pdev->strm, "%d 0 0 %d %d %d cm\n", w, h, x_offset,

                         -h + y_offset);

                pdf_image_writer_init(&writer);

                code = pdf_begin_write_image(pdev, &writer, gs_no_id, w, h, NULL, true);

                if (code < 0)

                    goto fail;

                pres = (pdf_resource_t *) pcp;

                goto wr;

            } else if (pdev->pte != NULL) {

                /* We're under pdf_text_process. It set a high level color. */

            } else

                set_image_color(pdev, one);

            pcp = (pdf_char_proc_t *) pres;

            x -= pdf_charproc_x_offset(pcp);

            y -= pdf_charproc_y_offset(pcp);

            y -= h;

            pdf_make_bitmap_image(&image, x, y, w, h);

            goto rx;

        }

        if (pdev->pte == NULL)

            set_image_color(pdev, one);

        gs_image_t_init_mask(&image, false);

        invert = 0xff;

    } else if (one == gx_no_color_index) {

        gs_image_t_init_mask(&image, false);

        if (pdev->pte == NULL)

            set_image_color(pdev, zero);

    } else if (zero == pdev->black && one == pdev->white) {

        pcs = gs_cspace_new_DeviceGray(pdev->memory);

        if (pcs == NULL) {

            code = gs_note_error(gs_error_VMerror);

            goto fail;

        }

        gs_image_t_init(&image, pcs);

    } else if (zero == pdev->white && one == pdev->black) {

        pcs = gs_cspace_new_DeviceGray(pdev->memory);

        if (pcs == NULL) {

            code = gs_note_error(gs_error_VMerror);

            goto fail;

        }

        gs_image_t_init(&image, pcs);

        invert = 0xff;

    } else {

        /*

         * We think this code is never executed when interpreting PostScript

         * or PDF: the library never uses monobit non-mask images

         * internally, and high-level images don't go through this code.

         * However, we still want the code to work.

         */

        gs_color_space *pcs_base;

        gx_color_index c[2];

        int i, j;

        int ncomp = pdev->color_info.num_components;

        byte *p;

        code = pdf_cspace_init_Device(pdev->memory, &pcs_base, ncomp);

        if (code < 0)

            goto fail;

        c[0] = psdf_adjust_color_index((gx_device_vector *)pdev, zero);

        c[1] = psdf_adjust_color_index((gx_device_vector *)pdev, one);

        pcs = gs_cspace_alloc(pdev->memory, &gs_color_space_type_Indexed);

        if (pcs == NULL) {

            rc_decrement_cs(pcs_base, "pdf_copy_mono");

            code = gs_note_error(gs_error_VMerror);

            goto fail;

        }

        pcs->base_space = pcs_base;

        pcs->params.indexed.hival = 1;

        pcs->params.indexed.n_comps = ncomp;

        p = palette;

        for (i = 0; i < 2; ++i)

            for (j = ncomp - 1; j >= 0; --j)

                *p++ = (byte)(c[i] >> (j * 8));

        pcs->params.indexed.lookup.table.data = palette;

        pcs->params.indexed.lookup.table.size = p - palette;

        pcs->params.indexed.use_proc = false;

        gs_image_t_init(&image, pcs);

        image.BitsPerComponent = 1;

    }

    pdf_make_bitmap_image(&image, x, y, w, h);

    {

        uint64_t nbytes = (uint64_t) ((w + 7) >> 3) * h;

        code = pdf_open_page(pdev, PDF_IN_STREAM);

        if (code < 0)

            goto fail;

        in_line = nbytes < pdev->MaxInlineImageSize;

        if (in_line)

            pdf_put_image_matrix(pdev, &image.ImageMatrix, 1.0);

        pdf_image_writer_init(&writer);

        code = pdf_begin_write_image(pdev, &writer, gs_no_id, w, h, NULL, in_line);

        if (code < 0)

            goto fail;

    }

  wr:

    if (image.ImageMask)

        pcsvalue = NULL;

    else {

        /*

         * We don't have to worry about color space scaling: the color

         * space is always a Device space.

         */

        code = pdf_color_space_named(pdev, NULL, &cs_value, NULL, pcs,

                               &writer.pin->color_spaces, in_line, NULL, 0, false);

        if (code < 0)

            goto fail;

        pcsvalue = &cs_value;

    }

    /*

     * There are 3 different cases at this point:

     *      - Writing an in-line image (pres == 0, writer.pres == 0);

     *      - Writing an XObject image (pres == 0, writer.pres != 0);

     *      - Writing the image for a CharProc (pres != 0).

     * We handle them with in-line code followed by a switch,

     * rather than making the shared code into a procedure,

     * simply because there would be an awful lot of parameters

     * that would need to be passed.

     */

    if (pres) {

        if (!pdev->NoT3CCITT) {

            /*

             * Always use CCITTFax 2-D for character bitmaps.  It takes less

             * space to invert the data with Decode than to set BlackIs1.

             */

            float d0 = image.Decode[0];

            image.Decode[0] = image.Decode[1];

            image.Decode[1] = d0;

            psdf_CFE_binary(&writer.binary[0], image.Width, image.Height, true);

            invert ^= 0xff;

        }

    } else {

        /* Use the Distiller compression parameters. */

        pdev->ParamCompatibilityLevel = pdev->CompatibilityLevel;

        psdf_setup_image_filters((gx_device_psdf *) pdev, &writer.binary[0],

                                 (gs_pixel_image_t *)&image, NULL, NULL, true, in_line);

    }

    code = pdf_begin_image_data(pdev, &writer, (const gs_pixel_image_t *)&image,

                         pcsvalue, 0);

    if (code < 0)

        goto fail;

    code = pdf_copy_mask_bits(writer.binary[0].strm, base, sourcex, raster,

                              w, h, invert);

    if (code < 0)

        goto fail;

    code = pdf_end_image_binary(pdev, &writer, writer.height);

    if (code < 0)

        goto fail;

    if (!pres) {

        switch ((code = pdf_end_write_image(pdev, &writer))) {

            default:                /* error */

                goto fail;

            case 1:

                code = 0;

                goto fail;

            case 0:

                code = pdf_do_image(pdev, writer.pres, &image.ImageMatrix,

                                    true);

                goto fail;

        }

    }

    writer.end_string = "";        /* no Q */

    switch ((code = pdf_end_write_image(pdev, &writer))) {

    default:                /* error */

        goto fail;

        return code;

    case 0:                        /* not possible */

        code = gs_note_error(gs_error_Fatal);

        goto fail;

    case 1:

        break;

    }

    code = pdf_end_char_proc(pdev, &ipos);

    if (code < 0)

        return code;

  rx:{

        gs_matrix imat;

        imat = image.ImageMatrix;

        imat.xx /= w;

        imat.xy /= h;

        imat.yx /= w;

        imat.yy /= h;

        return pdf_do_char_image(pdev, (const pdf_char_proc_t *)pres, &imat);

    }

fail:

    if (char_proc_begun)

        (void)pdf_end_char_proc(pdev, &ipos);

    return code;

}

int

gdev_pdf_copy_mono(gx_device * dev,

                   const byte * base, int sourcex, int raster, gx_bitmap_id id,

                   int x, int y, int w, int h, gx_color_index zero,

                   gx_color_index one)

{

    gx_device_pdf *pdev = (gx_device_pdf *) dev;

    if (w <= 0 || h <= 0)

        return 0;

    return pdf_copy_mono(pdev, base, sourcex, raster, id, x, y, w, h,

                         zero, one, NULL);

}

/* Copy a color bitmap.  for_pattern = -1 means put the image in-line, */

/* 1 means put the image in a resource, 2 means image is a rasterized shading. */

int

pdf_copy_color_data(gx_device_pdf * pdev, const byte * base, int sourcex,

                    int raster, gx_bitmap_id id, int x, int y, int w, int h,

                    gs_image_t *pim, pdf_image_writer *piw,

                    int for_pattern)

{

    int depth = pdev->color_info.depth;

    int bytes_per_pixel = depth >> 3;

    gs_color_space *pcs;

    cos_value_t cs_value;

    uint64_t nbytes;

    int code = pdf_cspace_init_Device(pdev->memory, &pcs, bytes_per_pixel);

    const byte *row_base;

    int row_step;

    bool in_line;

    if (code < 0)

        return code;                /* can't happen */

    if (!base)

        return 1;

    gs_image_t_init(pim, pcs);

    pdf_make_bitmap_image(pim, x, y, w, h);

    pim->BitsPerComponent = 8;

    nbytes = (uint64_t)w * bytes_per_pixel * h;

    if (for_pattern == 1) {

        /*

         * Patterns must be emitted in order of increasing user Y, i.e.,

         * the opposite of PDF's standard image order.

         */

        row_base = base + (h - 1) * raster;

        row_step = -raster;

        in_line = for_pattern < 0;

    } else {

        row_base = base;

        row_step = raster;

        in_line = nbytes < pdev->MaxInlineImageSize;

        pdf_put_image_matrix(pdev, &pim->ImageMatrix, 1.0);

        /*

         * Check whether we've already made an XObject resource for this

         * image.

         */

        if (id != gx_no_bitmap_id) {

            piw->pres = pdf_find_resource_by_gs_id(pdev, resourceXObject, id);

            if (piw->pres)

                return 0;

        }

    }

    /*

     * We have to be able to control whether to put Pattern images in line,

     * to avoid trying to create an XObject resource while we're in the

     * middle of writing a Pattern resource.

     */

    if (for_pattern < 0)

        stream_puts(pdev->strm, "q ");

    /*

     * We don't have to worry about color space scaling: the color

     * space is always a Device space.

     */

    pdf_image_writer_init(piw);

    pdev->ParamCompatibilityLevel = pdev->CompatibilityLevel;

    if ((code = pdf_begin_write_image(pdev, piw, id, w, h, NULL, in_line)) < 0 ||

        (code = pdf_color_space_named(pdev, NULL, &cs_value, NULL, pcs,

                                &piw->pin->color_spaces, in_line, NULL, 0, false)) < 0 ||

        (for_pattern < 2 || nbytes < 512000 ?

            (code = psdf_setup_lossless_filters((gx_device_psdf *) pdev,

                        &piw->binary[0], (gs_pixel_image_t *)pim, false)) :

            (code = psdf_setup_image_filters((gx_device_psdf *) pdev,

                        &piw->binary[0], (gs_pixel_image_t *)pim, NULL, NULL, false, false))

        ) < 0 ||

        (code = pdf_begin_image_data(pdev, piw, (const gs_pixel_image_t *)pim,

                                     &cs_value, 0)) < 0

        )

        return code;

    pdf_copy_color_bits(piw->binary[0].strm, row_base, sourcex, row_step, w, h,

                        bytes_per_pixel);

    pdf_end_image_binary(pdev, piw, piw->height);

    rc_decrement(pcs, "pdf_copy_color_data");

    return pdf_end_write_image(pdev, piw);

}

int

gdev_pdf_copy_color(gx_device * dev, const byte * base, int sourcex,

                    int raster, gx_bitmap_id id, int x, int y, int w, int h)

{

    gx_device_pdf *pdev = (gx_device_pdf *) dev;

    gs_image_t image;

    pdf_image_writer writer;

    int code;

    if (w <= 0 || h <= 0)

        return 0;

    code = pdf_open_page(pdev, PDF_IN_STREAM);

    if (code < 0)

        return code;

    /* Make sure we aren't being clipped. */

    code = pdf_put_clip_path(pdev, NULL);

    if (code < 0)

        return code;

    code = pdf_copy_color_data(pdev, base, sourcex, raster, id, x, y, w, h,

                               &image, &writer, 0);

    switch (code) {

        default:

            return code;        /* error */

        case 1:

            return 0;

        case 0:

            return pdf_do_image(pdev, writer.pres, NULL, true);

    }

}

/* Fill a mask. */

int

gdev_pdf_fill_mask(gx_device * dev,

                   const byte * data, int data_x, int raster, gx_bitmap_id id,

                   int x, int y, int width, int height,

                   const gx_drawing_color * pdcolor, int depth,

                   gs_logical_operation_t lop, const gx_clip_path * pcpath)

{

    gx_device_pdf *pdev = (gx_device_pdf *) dev;

    pdf_text_enum_t *penum = (pdf_text_enum_t *)pdev->OCR_enum;

    if (width <= 0 || height <= 0)

        return 0;

    /* If OCRStage is 'OCR_Rendering' then we are handling an image which is a rendered glyph

     * that we want to have OCR software process and return a Unicode code point for.

     * We specifically do *not* want to send the image to the output PDF file!

     */

    if (pdev->OCRStage == OCR_Rendering) {

        int code = 0;

        ocr_glyph_t *new_glyph = NULL;

        int index;

        new_glyph = (ocr_glyph_t *)gs_alloc_bytes(pdev->pdf_memory, sizeof(ocr_glyph_t), "");

        if (new_glyph == NULL)

            return_error(gs_error_VMerror);

        new_glyph->data = gs_alloc_bytes(pdev->pdf_memory, raster*height, "");

        if (new_glyph->data == NULL)

            return_error(gs_error_VMerror);

        memcpy(new_glyph->data, data, raster * height);

        new_glyph->height = height;

        new_glyph->width = width;

        new_glyph->raster = raster;

        new_glyph->x = x;

        new_glyph->y = y;

        if (penum != NULL) {

            new_glyph->char_code = penum->pte_default->returned.current_char;

            new_glyph->glyph = penum->pte_default->returned.current_glyph;

        } else {

            new_glyph->char_code = pdev->OCR_char_code;

            new_glyph->glyph = pdev->OCR_glyph;

        }

        new_glyph->next = NULL;

        new_glyph->is_space = true;

        for(index = 0; index < height * raster;index++){

            if(data[index] != 0x00) {

                new_glyph->is_space = false;

                break;

            }

        }

        if (pdev->ocr_glyphs == NULL)

            pdev->ocr_glyphs = new_glyph;

        else {

            ocr_glyph_t *next = pdev->ocr_glyphs;

            while (next->next != NULL)

                next = next->next;

            next->next = new_glyph;

        }

        return code;

    }

    if (depth > 1 || (!gx_dc_is_pure(pdcolor) != 0 && !(gx_dc_is_pattern1_color(pdcolor))))

        return gx_default_fill_mask(dev, data, data_x, raster, id,

                                    x, y, width, height, pdcolor, depth, lop,

                                    pcpath);

    return pdf_copy_mono(pdev, data, data_x, raster, id, x, y, width, height,

                         gx_no_color_index, gx_dc_pure_color(pdcolor),

                         pcpath);

}

/* Tile with a bitmap.  This is important for pattern fills. */

int

gdev_pdf_strip_tile_rectangle(gx_device * dev, const gx_strip_bitmap * tiles,

                              int x, int y, int w, int h,

                              gx_color_index color0, gx_color_index color1,

                              int px, int py)

{

    gx_device_pdf *const pdev = (gx_device_pdf *) dev;

    int tw = tiles->rep_width, th = tiles->rep_height;

    double xscale = pdev->HWResolution[0] / 72.0,

        yscale = pdev->HWResolution[1] / 72.0;

    bool mask;

    int depth;

    int (*copy_data)(gx_device_pdf *, const byte *, int, int,

                     gx_bitmap_id, int, int, int, int,

                     gs_image_t *, pdf_image_writer *, int);

    pdf_resource_t *pres;

    cos_value_t cs_value;

    int code;

    if (tiles->id == gx_no_bitmap_id || tiles->shift != 0 ||

        (w < tw && h < th) ||

        color0 != gx_no_color_index

        )

        goto use_default;

    if (color1 != gx_no_color_index) {

        /* This is a mask pattern. */

        mask = true;

        depth = 1;

        copy_data = pdf_copy_mask_data;

        code = pdf_cs_Pattern_uncolored(pdev, &cs_value);

    } else {

        /* This is a colored pattern. */

        mask = false;

        depth = pdev->color_info.depth;

        copy_data = pdf_copy_color_data;

        code = pdf_cs_Pattern_colored(pdev, &cs_value);

    }

    if (code < 0)

        goto use_default;

    pres = pdf_find_resource_by_gs_id(pdev, resourcePattern, tiles->id);

    if (!pres) {

        /* Create the Pattern resource. */

        int code;

        int64_t length_id;

        gs_offset_t start, end;

        stream *s;

        gs_image_t image;

        pdf_image_writer writer;

        int64_t image_bytes = ((int64_t)tw * depth + 7) / 8 * th;

        bool in_line = image_bytes < pdev->MaxInlineImageSize;

        int64_t tile_id =

            (tw == tiles->size.x && th == tiles->size.y ? tiles->id :

             gx_no_bitmap_id);

        if (!in_line)

            goto use_default;

        code = pdf_begin_resource(pdev, resourcePattern, tiles->id, &pres);

        if (code < 0)

            goto use_default;

        s = pdev->strm;

        pprintd1(s, "/PatternType 1/PaintType %d/TilingType 1/Resources<<\n",

                 (mask ? 2 : 1));

        if (pdev->CompatibilityLevel <= 1.7)

            pprints1(s, "/ProcSet[/PDF/Image%s]>>\n", (mask ? "B" : "C"));

        /*

         * Because of bugs in Acrobat Reader's Print function, we can't use

         * the natural BBox and Step here: they have to be 1.

         */

        pprintg2(s, "/Matrix[%g 0 0 %g 0 0]", tw / xscale, th / yscale);

        stream_puts(s, "/BBox[0 0 1 1]/XStep 1/YStep 1/Length ");

        length_id = pdf_obj_ref(pdev);

        pprinti64d1(s, "%"PRId64" 0 R>>stream\n", length_id);

        start = pdf_stell(pdev);

        code = copy_data(pdev, tiles->data, 0, tiles->raster,

                         tile_id, 0, 0, tw, th, &image, &writer, -1);

        switch (code) {

        default:

            return code;        /* error */

        case 1:

            break;

        case 0:                        /* not possible */

            return_error(gs_error_Fatal);

        }

        end = pdf_stell(pdev);

        stream_puts(s, "\nendstream\n");

        pdf_end_resource(pdev, resourcePattern);

        pdf_open_separate(pdev, length_id, resourceNone);

        pprinti64d1(pdev->strm, "%"PRId64"\n", end - start);

        pdf_end_separate(pdev, resourceNone);

        pres->object->written = true; /* don't write at end of page */

    }

    /* Fill the rectangle with the Pattern. */

    {

        int code = pdf_open_page(pdev, PDF_IN_STREAM);

        stream *s;

        if (code < 0)

            goto use_default;

        /* Make sure we aren't being clipped. */

        code = pdf_put_clip_path(pdev, NULL);

        if (code < 0)

            return code;

        s = pdev->strm;

        /*

         * Because of bugs in Acrobat Reader's Print function, we can't

         * leave the CTM alone here: we have to reset it to the default.

         */

        pprintg2(s, "q %g 0 0 %g 0 0 cm\n", xscale, yscale);

        cos_value_write(&cs_value, pdev);

        stream_puts(s, " cs");

        if (mask)

            pprintg3(s, " %g %g %g", (int)(color1 >> 16) / 255.0,

                     (int)((color1 >> 8) & 0xff) / 255.0,

                     (int)(color1 & 0xff) / 255.0);

        pprinti64d1(s, "/R%"PRId64" scn", pdf_resource_id(pres));

        pprintg4(s, " %g %g %g %g re f Q\n",

                 x / xscale, y / yscale, w / xscale, h / xscale);

    }

    return 0;

use_default:

    return gx_default_strip_tile_rectangle(dev, tiles, x, y, w, h,

                                           color0, color1, px, py);

}