/* Copyright (C) 1989, 2000 Aladdin Enterprises.  All rights reserved.
  
  This file is part of AFPL Ghostscript.
  
  AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
  distributor accepts any responsibility for the consequences of using it, or
  for whether it serves any particular purpose or works at all, unless he or
  she says so in writing.  Refer to the Aladdin Free Public License (the
  "License") for full details.
  
  Every copy of AFPL Ghostscript must include a copy of the License, normally
  in a plain ASCII text file named PUBLIC.  The License grants you the right
  to copy, modify and redistribute AFPL Ghostscript, but only under certain
  conditions described in the License.  Among other things, the License
  requires that the copyright notice and this notice be preserved on all
  copies.
*/

/*$Id: gximage1.c,v 1.5 2000/09/19 19:00:38 lpd Exp $ */
/* ImageType 1 initialization */
#include "gx.h"
#include "gserrors.h"
#include "gxiparam.h"
#include "gximage.h"
#include "stream.h"

/* Structure descriptor */
public_st_gs_image1();

/*
 * Define the image types for ImageType 1 images.
 * Note that opaque images and masks have different types, although
 * they have the same ImageType.
 */
private image_proc_sput(gx_image1_sput);
private image_proc_sget(gx_image1_sget);
private image_proc_release(gx_image1_release);
const gx_image_type_t gs_image_type_1 = {
    &st_gs_image1, gx_begin_image1, gx_data_image_source_size,
    gx_image1_sput, gx_image1_sget, gx_image1_release, 1
};
private image_proc_sput(gx_image1_mask_sput);
private image_proc_sget(gx_image1_mask_sget);
/*
 * Image masks are not actually pixel images, so they don't need to
 * worry about releasing the color space.
 */
const gx_image_type_t gs_image_type_mask1 = {
    &st_gs_image1, gx_begin_image1, gx_data_image_source_size,
    gx_image1_mask_sput, gx_image1_mask_sget, gx_image_default_release, 1
};

/* Define the procedures for initializing gs_image_ts to default values. */
void
gs_image_t_init_adjust(gs_image_t * pim, const gs_color_space * color_space,
		       bool adjust)
{
    gs_pixel_image_t_init((gs_pixel_image_t *) pim, color_space);
    pim->ImageMask = (color_space == NULL);
    pim->adjust = adjust;
    pim->type = (pim->ImageMask ? &gs_image_type_mask1 : &gs_image_type_1);
    pim->Alpha = gs_image_alpha_none;
}
void
gs_image_t_init_mask_adjust(gs_image_t * pim, bool write_1s, bool adjust)
{
    gs_image_t_init(pim, NULL);
    if (write_1s)
	pim->Decode[0] = 1, pim->Decode[1] = 0;
    else
	pim->Decode[0] = 0, pim->Decode[1] = 1;
    pim->adjust = adjust;
}

/* Start processing an ImageType 1 image. */
int
gx_begin_image1(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_image_t *pim = (const gs_image_t *)pic;
    int code = gx_image_enum_alloc(pic, prect, mem, &penum);

    if (code < 0)
	return code;
    penum->alpha = pim->Alpha;
    penum->use_mask_color = false;
    penum->masked = pim->ImageMask;
    penum->adjust =
	(pim->ImageMask && pim->adjust ? float2fixed(0.25) : fixed_0);
    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 */

/*
 * We add the Alpha value to the control word.
 */

private int
gx_image1_sput(const gs_image_common_t *pic, stream *s,
	       const gs_color_space **ppcs)
{
    const gs_image_t *const pim = (const gs_image_t *)pic;

    return gx_pixel_image_sput((const gs_pixel_image_t *)pic, s, ppcs,
			       (int)pim->Alpha);
}

private int
gx_image1_sget(gs_image_common_t *pic, stream *s,
	       const gs_color_space *pcs)
{
    gs_image1_t *const pim = (gs_image1_t *)pic;
    int code = gx_pixel_image_sget((gs_pixel_image_t *)pim, s, pcs);

    if (code < 0)
	return code;
    pim->type = &gs_image_type_1;
    pim->ImageMask = false;
    pim->Alpha = code;
    return 0;
}

/*
 * Masks have different parameters, so we use a different encoding:
 *	FFFFEEDCBA
 *	    A = 0 if standard ImageMatrix, 1 if explicit ImageMatrix
 *	    B = 0 if Decode=[0 1], 1 if Decode=[1 0]
 *	    C = Interpolate
 *	    D = adjust
 *	    EE = Alpha
 *	    FFFF = BitsPerComponent - 1 (only needed for soft masks)
 *	Width, encoded as a variable-length uint
 *	Height, encoded like Width
 *	ImageMatrix (if A = 1), per gs_matrix_store/fetch
 */
#define MI_ImageMatrix 0x01
#define MI_Decode 0x02
#define MI_Interpolate 0x04
#define MI_adjust 0x08
#define MI_Alpha_SHIFT 4
#define MI_Alpha_MASK 0x3
#define MI_BPC_SHIFT 6
#define MI_BPC_MASK 0xf
#define MI_BITS 10

private int
gx_image1_mask_sput(const gs_image_common_t *pic, stream *s,
		    const gs_color_space **ignore_ppcs)
{
    const gs_image_t *pim = (const gs_image_t *)pic;
    uint control =
	(gx_image_matrix_is_default((const gs_data_image_t *)pim) ? 0 :
	 MI_ImageMatrix) |
	(pim->Decode[0] != 0 ? MI_Decode : 0) |
	(pim->Interpolate ? MI_Interpolate : 0) |
	(pim->adjust ? MI_adjust : 0) |
	(pim->Alpha << MI_Alpha_SHIFT) |
	((pim->BitsPerComponent - 1) << MI_BPC_SHIFT);

    sput_variable_uint(s, control);
    sput_variable_uint(s, (uint)pim->Width);
    sput_variable_uint(s, (uint)pim->Height);
    if (control & MI_ImageMatrix)
	sput_matrix(s, &pim->ImageMatrix);
    return 0;
}

private int
gx_image1_mask_sget(gs_image_common_t *pic, stream *s,
		    const gs_color_space *ignore_pcs)
{
    gs_image1_t *const pim = (gs_image1_t *)pic;
    int code;
    uint control;

    if ((code = sget_variable_uint(s, &control)) < 0)
	return code;
    gs_image_t_init_mask(pim, (control & MI_Decode) != 0);
    if ((code = sget_variable_uint(s, (uint *)&pim->Width)) < 0 ||
	(code = sget_variable_uint(s, (uint *)&pim->Height)) < 0
	)
	return code;
    if (control & MI_ImageMatrix) {
	if ((code = sget_matrix(s, &pim->ImageMatrix)) < 0)
	    return code;
    } else
	gx_image_matrix_set_default((gs_data_image_t *)pim);
    pim->Interpolate = (control & MI_Interpolate) != 0;
    pim->adjust = (control & MI_adjust) != 0;
    pim->Alpha = (control >> MI_Alpha_SHIFT) & MI_Alpha_MASK;
    pim->BitsPerComponent = ((control >> MI_BPC_SHIFT) & MI_BPC_MASK) + 1;
    return 0;
}

private void
gx_image1_release(gs_image_common_t *pic, gs_memory_t *mem)
{
    gx_pixel_image_release((gs_pixel_image_t *)pic, mem);
}
