/* qbism.h
 *
 * Copyright (C) 2005-2006 by Andy Goth <unununium@openverse.com>.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307, USA. */

#ifndef SEEN_QBISM_H
#define SEEN_QBISM_H

#include <stdio.h>

/* Supported transformation operations. */
typedef enum {
    XOP_PROJECTION,
    XOP_SHIFT,
    XOP_SHIFTBACK,
    XOP_ROTATE,
    XOP_ROTATEBACK,
    XOP_MULTIPLY,
    XOP_SINE,
    XOP_CONDITIONAL,
    XOP_COMPLEMENT,
    XOP_COUNT
} xform_op_t;

/* Single transformation instruction. */
typedef struct {
    xform_op_t opcode;          /* Operation to perform. */
    int source;                 /* Index of the source register. */
    int control;                /* Index of the control register. */
    int dest;                   /* Index of the destination register. */
} xform_t;

/* Sequence of transformation instructions. */
typedef struct {
    xform_t* seq;               /* The sequence of instructions. */
    int seq_len;                /* Number of instructions in the sequence. */
    int num_regs;               /* Number of registers needed. */
} algo_t;

/* RGB pixel or register consisting of red, green, and blue channels. */
typedef union {
    float c[3];                 /* Channels by number. */
    struct {
        float r, g, b;          /* Channels by name. */
    };
} pixel_t;

/* Supported output image formats. */
typedef enum {
    IF_MIFF8,                   /* 8 bits/channel ImageMagick MIFF. */
    IF_MIFF16,                  /* 16 bits/channel ImageMagick MIFF. */
    IF_BMP                      /* Micro$oft Windohs BMP format. */
} imgfmt_t;

/* Image parameters. */
typedef struct {
    int width;                  /* Image width in pixels. */
    int height;                 /* Image height in pixels. */
    int oversample;             /* Subsampling factor. */
    algo_t* algo;               /* Algorithm to execute. */
    imgfmt_t format;            /* Output image format. */
    FILE* target;               /* Output target file. */
} image_t;

/* Function prototypes. */
extern void* xmalloc(size_t bytes);
extern void* xrealloc(void* buf, size_t bytes);
extern void qbe_read(algo_t* algo, FILE* in);
extern void qbe_read(algo_t* algo, FILE* in);
extern void qbm_write(algo_t* algo, FILE* out);
extern void qbm_write(algo_t* algo, FILE* out);
extern void qbism_render_image(image_t* img);

#endif

/* vim: set ts=4 sts=4 sw=4 tw=80 et: */