File: gximage4.c

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/* 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: gximage4.c 10456 2009-12-06 14:55:58Z alexcher $ */
/* ImageType 4 image implementation */
#include "memory_.h"
#include "gx.h"
#include "gserrors.h"
#include "gscspace.h"
#include "gsiparm4.h"
#include "gxiparam.h"
#include "gximage.h"
#include "stream.h"

/* Forward references */
static dev_proc_begin_typed_image(gx_begin_image4);

/* Structure descriptor */
private_st_gs_image4();

/* Define the image type for ImageType 4 images. */
static image_proc_sput(gx_image4_sput);
static image_proc_sget(gx_image4_sget);
static image_proc_release(gx_image4_release);
const gx_image_type_t gs_image_type_4 = {
    &st_gs_image4, gx_begin_image4, gx_data_image_source_size,
    gx_image4_sput, gx_image4_sget, gx_image4_release, 4
};
/*
 * The implementation is shared with ImageType 1, so we don't need our own
 * enum_procs.
 */
/*
  static const gx_image_enum_procs_t image4_enum_procs = {
    gx_image1_plane_data, gx_image1_end_image
  };
*/

/* Initialize an ImageType 4 image. */
void
gs_image4_t_init(gs_image4_t * pim, gs_color_space * color_space)
{
    gs_pixel_image_t_init((gs_pixel_image_t *) pim, color_space);
    pim->type = &gs_image_type_4;
    pim->MaskColor_is_range = false;
}

/* Start processing an ImageType 4 image. */
static int
gx_begin_image4(gx_device * dev,
		const gs_imager_state * pis, const gs_matrix * pmat,
		const gs_image_common_t * pic, const gs_int_rect * prect,
		const gx_drawing_color * pdcolor, const gx_clip_path * pcpath,
		gs_memory_t * mem, gx_image_enum_common_t ** pinfo)
{
    gx_image_enum *penum;
    const gs_image4_t *pim = (const gs_image4_t *)pic;
    int code = gx_image_enum_alloc(pic, prect, mem, &penum);

    if (code < 0)
	return code;
    penum->alpha = gs_image_alpha_none;
    penum->masked = false;
    penum->adjust = fixed_0;
    /* Check that MaskColor values are within the valid range. */
    {
	bool opaque = false;
	uint max_value = (1 << pim->BitsPerComponent) - 1;
	int spp = cs_num_components(pim->ColorSpace);
	int i;

	for (i = 0; i < spp * 2; i += 2) {
	    uint c0, c1;

	    if (pim->MaskColor_is_range)
		c0 = pim->MaskColor[i], c1 = pim->MaskColor[i + 1];
	    else
		c0 = c1 = pim->MaskColor[i >> 1];

	    if ((c0 | c1) > max_value) {
		gs_free_object(mem, penum, "gx_begin_image4");
		return_error(gs_error_rangecheck);
	    }
	    if (c0 > c1) {
		opaque = true;	/* pixel can never match mask color */
		break;
	    }
	    penum->mask_color.values[i] = c0;
	    penum->mask_color.values[i + 1] = c1;
	}
	penum->use_mask_color = !opaque;
    }
    code = gx_image_enum_begin(dev, pis, pmat, pic, pdcolor, pcpath, mem,
			       penum);
    if (code >= 0)
	*pinfo = (gx_image_enum_common_t *)penum;
    return code;
}

/* Serialization */

static int
gx_image4_sput(const gs_image_common_t *pic, stream *s,
	       const gs_color_space **ppcs)
{
    const gs_image4_t *pim = (const gs_image4_t *)pic;
    bool is_range = pim->MaskColor_is_range;
    int code = gx_pixel_image_sput((const gs_pixel_image_t *)pim, s, ppcs,
				   is_range);
    int num_values =
	gs_color_space_num_components(pim->ColorSpace) * (is_range ? 2 : 1);
    int i;

    if (code < 0)
	return code;
    for (i = 0; i < num_values; ++i)
	sput_variable_uint(s, pim->MaskColor[i]);
    *ppcs = pim->ColorSpace;
    return 0;
}

static int
gx_image4_sget(gs_image_common_t *pic, stream *s,
	       gs_color_space *pcs)
{
    gs_image4_t *const pim = (gs_image4_t *)pic;
    int num_values;
    int i;
    int code = gx_pixel_image_sget((gs_pixel_image_t *)pim, s, pcs);

    if (code < 0)
	return code;
    pim->type = &gs_image_type_4;
    pim->MaskColor_is_range = code;
    num_values =
	gs_color_space_num_components(pcs) *
	(pim->MaskColor_is_range ? 2 : 1);
    for (i = 0; i < num_values; ++i) {
	code = sget_variable_uint(s, &pim->MaskColor[i]);
        if (code < 0)
	    return code;
    }
    return 0;
}

static void
gx_image4_release(gs_image_common_t *pic, gs_memory_t *mem)
{
    gx_pixel_image_release((gs_pixel_image_t *)pic, mem);
}