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/* Copyright (C) 1998, 2000 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: gximage4.c,v 1.6 2005/04/13 20:04:46 ray Exp $ */
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/* ImageType 4 image implementation */
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#include "memory_.h"
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#include "gx.h"
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#include "gserrors.h"
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#include "gscspace.h"
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#include "gsiparm4.h"
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#include "gxiparam.h"
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#include "gximage.h"
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#include "stream.h"
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/* Forward references */
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private dev_proc_begin_typed_image(gx_begin_image4);
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/* Structure descriptor */
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private_st_gs_image4();
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/* Define the image type for ImageType 4 images. */
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private image_proc_sput(gx_image4_sput);
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private image_proc_sget(gx_image4_sget);
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private image_proc_release(gx_image4_release);
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const gx_image_type_t gs_image_type_4 = {
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&st_gs_image4, gx_begin_image4, gx_data_image_source_size,
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gx_image4_sput, gx_image4_sget, gx_image4_release, 4
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};
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/*
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* The implementation is shared with ImageType 1, so we don't need our own
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* enum_procs.
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*/
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/*
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private const gx_image_enum_procs_t image4_enum_procs = {
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gx_image1_plane_data, gx_image1_end_image
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};
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*/
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/* Initialize an ImageType 4 image. */
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void
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gs_image4_t_init(gs_image4_t * pim, const gs_color_space * color_space)
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{
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gs_pixel_image_t_init((gs_pixel_image_t *) pim, color_space);
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pim->type = &gs_image_type_4;
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pim->MaskColor_is_range = false;
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}
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/* Start processing an ImageType 4 image. */
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private int
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gx_begin_image4(gx_device * dev,
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const gs_imager_state * pis, const gs_matrix * pmat,
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const gs_image_common_t * pic, const gs_int_rect * prect,
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const gx_drawing_color * pdcolor, const gx_clip_path * pcpath,
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gs_memory_t * mem, gx_image_enum_common_t ** pinfo)
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{
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gx_image_enum *penum;
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const gs_image4_t *pim = (const gs_image4_t *)pic;
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int code = gx_image_enum_alloc(pic, prect, mem, &penum);
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if (code < 0)
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return code;
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penum->alpha = gs_image_alpha_none;
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penum->masked = false;
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penum->adjust = fixed_0;
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/* Check that MaskColor values are within the valid range. */
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{
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bool opaque = false;
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uint max_value = (1 << pim->BitsPerComponent) - 1;
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int spp = cs_num_components(pim->ColorSpace);
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int i;
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for (i = 0; i < spp * 2; i += 2) {
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uint c0, c1;
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if (pim->MaskColor_is_range)
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c0 = pim->MaskColor[i], c1 = pim->MaskColor[i + 1];
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else
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c0 = c1 = pim->MaskColor[i >> 1];
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if ((c0 | c1) > max_value) {
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gs_free_object(mem, penum, "gx_begin_image4");
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return_error(gs_error_rangecheck);
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}
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if (c0 > c1) {
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opaque = true; /* pixel can never match mask color */
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break;
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}
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penum->mask_color.values[i] = c0;
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penum->mask_color.values[i + 1] = c1;
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}
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penum->use_mask_color = !opaque;
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}
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code = gx_image_enum_begin(dev, pis, pmat, pic, pdcolor, pcpath, mem,
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penum);
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if (code >= 0)
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*pinfo = (gx_image_enum_common_t *)penum;
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return code;
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}
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/* Serialization */
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private int
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gx_image4_sput(const gs_image_common_t *pic, stream *s,
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const gs_color_space **ppcs)
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{
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const gs_image4_t *pim = (const gs_image4_t *)pic;
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bool is_range = pim->MaskColor_is_range;
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int code = gx_pixel_image_sput((const gs_pixel_image_t *)pim, s, ppcs,
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is_range);
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int num_values =
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gs_color_space_num_components(pim->ColorSpace) * (is_range ? 2 : 1);
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int i;
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if (code < 0)
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return code;
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for (i = 0; i < num_values; ++i)
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sput_variable_uint(s, pim->MaskColor[i]);
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*ppcs = pim->ColorSpace;
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return 0;
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}
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private int
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gx_image4_sget(gs_image_common_t *pic, stream *s,
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const gs_color_space *pcs)
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{
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gs_image4_t *const pim = (gs_image4_t *)pic;
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int num_values;
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int i;
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int code = gx_pixel_image_sget((gs_pixel_image_t *)pim, s, pcs);
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if (code < 0)
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return code;
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pim->type = &gs_image_type_4;
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pim->MaskColor_is_range = code;
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num_values =
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gs_color_space_num_components(pcs) *
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(pim->MaskColor_is_range ? 2 : 1);
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for (i = 0; i < num_values; ++i)
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sget_variable_uint(s, &pim->MaskColor[i]);
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return 0;
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}
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private void
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gx_image4_release(gs_image_common_t *pic, gs_memory_t *mem)
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{
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gx_pixel_image_release((gs_pixel_image_t *)pic, mem);
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}
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