/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2021 Kevin Matocha
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "shared-bindings/displayio/Bitmap.h"
#include "shared-bindings/displayio/Palette.h"
#include "shared-bindings/displayio/ColorConverter.h"
#include "shared-bindings/bitmaptools/__init__.h"

#include <stdint.h>

#include "py/binary.h"
#include "py/enum.h"
#include "py/obj.h"
#include "py/runtime.h"

#if MICROPY_VFS
#include "extmod/vfs.h"
#endif
#if defined(MICROPY_VFS_POSIX) && MICROPY_VFS_POSIX
#include "extmod/vfs_posix.h"
#endif

//| """Collection of bitmap manipulation tools"""
//|

STATIC int16_t validate_point(mp_obj_t point, int16_t default_value) {
    // Checks if point is None and returns default_value, otherwise decodes integer value
    if (point == mp_const_none) {
        return default_value;
    }
    return mp_obj_get_int(point);
}

STATIC void extract_tuple(mp_obj_t xy_tuple, int16_t *x, int16_t *y, int16_t x_default, int16_t y_default) {
    // Helper function for rotozoom
    // Extract x,y values from a tuple or default if None
    if (xy_tuple == mp_const_none) {
        *x = x_default;
        *y = y_default;
    } else if (!mp_obj_is_obj(xy_tuple)) {
        mp_raise_ValueError(translate("clip point must be (x,y) tuple"));
    } else {
        mp_obj_t *items;
        mp_obj_get_array_fixed_n(xy_tuple, 2, &items);
        *x = mp_obj_get_int(items[0]);
        *y = mp_obj_get_int(items[1]);
    }
}

STATIC void validate_clip_region(displayio_bitmap_t *bitmap, mp_obj_t clip0_tuple, int16_t *clip0_x, int16_t *clip0_y,
    mp_obj_t clip1_tuple, int16_t *clip1_x, int16_t *clip1_y) {
    // Helper function for rotozoom
    // 1. Extract the clip x,y points from the two clip tuples
    // 2. Rearrange values such that clip0_ < clip1_
    // 3. Constrain the clip points to within the bitmap

    extract_tuple(clip0_tuple, clip0_x, clip0_y, 0, 0);
    extract_tuple(clip1_tuple, clip1_x, clip1_y, bitmap->width, bitmap->height);

    // Ensure the value for clip0 is less than clip1 (for both x and y)
    if (*clip0_x > *clip1_x) {
        int16_t temp_value = *clip0_x; // swap values
        *clip0_x = *clip1_x;
        *clip1_x = temp_value;
    }
    if (*clip0_y > *clip1_y) {
        int16_t temp_value = *clip0_y; // swap values
        *clip0_y = *clip1_y;
        *clip1_y = temp_value;
    }

    // Constrain the clip window to within the bitmap boundaries
    if (*clip0_x < 0) {
        *clip0_x = 0;
    }
    if (*clip0_y < 0) {
        *clip0_y = 0;
    }
    if (*clip0_x > bitmap->width) {
        *clip0_x = bitmap->width;
    }
    if (*clip0_y > bitmap->height) {
        *clip0_y = bitmap->height;
    }
    if (*clip1_x < 0) {
        *clip1_x = 0;
    }
    if (*clip1_y < 0) {
        *clip1_y = 0;
    }
    if (*clip1_x > bitmap->width) {
        *clip1_x = bitmap->width;
    }
    if (*clip1_y > bitmap->height) {
        *clip1_y = bitmap->height;
    }

}

//|
//| def rotozoom(
//|        dest_bitmap: displayio.Bitmap, source_bitmap: displayio.Bitmap,
//|        *,
//|        ox: int, oy: int, dest_clip0: Tuple[int, int], dest_clip1: Tuple[int, int],
//|        px: int, py: int, source_clip0: Tuple[int, int], source_clip1: Tuple[int, int],
//|        angle: float, scale: float, skip_index: int) -> None:
//|      """Inserts the source bitmap region into the destination bitmap with rotation
//|      (angle), scale and clipping (both on source and destination bitmaps).
//|
//|      :param bitmap dest_bitmap: Destination bitmap that will be copied into
//|      :param bitmap source_bitmap: Source bitmap that contains the graphical region to be copied
//|      :param int ox: Horizontal pixel location in destination bitmap where source bitmap
//|             point (px,py) is placed
//|      :param int oy: Vertical pixel location in destination bitmap where source bitmap
//|             point (px,py) is placed
//|      :param Tuple[int,int] dest_clip0: First corner of rectangular destination clipping
//|             region that constrains region of writing into destination bitmap
//|      :param Tuple[int,int] dest_clip1: Second corner of rectangular destination clipping
//|             region that constrains region of writing into destination bitmap
//|      :param int px: Horizontal pixel location in source bitmap that is placed into the
//|             destination bitmap at (ox,oy)
//|      :param int py: Vertical pixel location in source bitmap that is placed into the
//|             destination bitmap at (ox,oy)
//|      :param Tuple[int,int] source_clip0: First corner of rectangular source clipping
//|             region that constrains region of reading from the source bitmap
//|      :param Tuple[int,int] source_clip1: Second corner of rectangular source clipping
//|             region that constrains region of reading from the source bitmap
//|      :param float angle: Angle of rotation, in radians (positive is clockwise direction)
//|      :param float scale: Scaling factor
//|      :param int skip_index: Bitmap palette index in the source that will not be copied,
//|             set to None to copy all pixels"""
//|      ...
//|
STATIC mp_obj_t bitmaptools_obj_rotozoom(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum {ARG_dest_bitmap, ARG_source_bitmap,
          ARG_ox, ARG_oy, ARG_dest_clip0, ARG_dest_clip1,
          ARG_px, ARG_py, ARG_source_clip0, ARG_source_clip1,
          ARG_angle, ARG_scale, ARG_skip_index};

    static const mp_arg_t allowed_args[] = {
        {MP_QSTR_dest_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_source_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL}},

        {MP_QSTR_ox, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} }, // None convert to destination->width  / 2
        {MP_QSTR_oy, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} }, // None convert to destination->height / 2
        {MP_QSTR_dest_clip0, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
        {MP_QSTR_dest_clip1, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },

        {MP_QSTR_px, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} }, // None convert to source->width  / 2
        {MP_QSTR_py, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} }, // None convert to source->height / 2
        {MP_QSTR_source_clip0, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
        {MP_QSTR_source_clip1, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },

        {MP_QSTR_angle, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} }, // None convert to 0.0
        {MP_QSTR_scale, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} }, // None convert to 1.0
        {MP_QSTR_skip_index, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
    };

    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(args[ARG_dest_bitmap].u_obj); // the destination bitmap

    displayio_bitmap_t *source = MP_OBJ_TO_PTR(args[ARG_source_bitmap].u_obj); // the source bitmap

    // ensure that the destination bitmap has at least as many `bits_per_value` as the source
    if (destination->bits_per_value < source->bits_per_value) {
        mp_raise_ValueError(translate("source palette too large"));
    }

    // Confirm the destination location target (ox,oy); if None, default to bitmap midpoint
    int16_t ox, oy;
    ox = validate_point(args[ARG_ox].u_obj, destination->width / 2);
    oy = validate_point(args[ARG_oy].u_obj, destination->height / 2);

    // Confirm the source location target (px,py); if None, default to bitmap midpoint
    int16_t px, py;
    px = validate_point(args[ARG_px].u_obj, source->width / 2);
    py = validate_point(args[ARG_py].u_obj, source->height / 2);

    // Validate the clipping regions for the destination bitmap
    int16_t dest_clip0_x, dest_clip0_y, dest_clip1_x, dest_clip1_y;

    validate_clip_region(destination, args[ARG_dest_clip0].u_obj, &dest_clip0_x, &dest_clip0_y,
        args[ARG_dest_clip1].u_obj, &dest_clip1_x, &dest_clip1_y);

    // Validate the clipping regions for the source bitmap
    int16_t source_clip0_x, source_clip0_y, source_clip1_x, source_clip1_y;

    validate_clip_region(source, args[ARG_source_clip0].u_obj, &source_clip0_x, &source_clip0_y,
        args[ARG_source_clip1].u_obj, &source_clip1_x, &source_clip1_y);

    // Confirm the angle value
    mp_float_t angle = 0.0;
    if (args[ARG_angle].u_obj != mp_const_none) {
        angle = mp_obj_get_float(args[ARG_angle].u_obj);
    }

    // Confirm the scale value
    mp_float_t scale = 1.0;
    if (args[ARG_scale].u_obj != mp_const_none) {
        scale = mp_obj_get_float(args[ARG_scale].u_obj);
    }
    if (scale < 0) { // ensure scale >= 0
        scale = 1.0;
    }

    uint32_t skip_index;
    bool skip_index_none; // Flag whether input skip_value was None
    if (args[ARG_skip_index].u_obj == mp_const_none) {
        skip_index = 0;
        skip_index_none = true;
    } else {
        skip_index = mp_obj_get_int(args[ARG_skip_index].u_obj);
        skip_index_none = false;
    }

    common_hal_bitmaptools_rotozoom(destination, ox, oy,
        dest_clip0_x, dest_clip0_y,
        dest_clip1_x, dest_clip1_y,
        source, px, py,
        source_clip0_x, source_clip0_y,
        source_clip1_x, source_clip1_y,
        angle,
        scale,
        skip_index, skip_index_none);

    return mp_const_none;
}

MP_DEFINE_CONST_FUN_OBJ_KW(bitmaptools_rotozoom_obj, 0, bitmaptools_obj_rotozoom);
// requires at least 2 arguments (destination bitmap and source bitmap)

//|
//| def alphablend(dest_bitmap, source_bitmap_1, source_bitmap_2, colorspace: displayio.Colorspace, factor1: float=.5, factor2: float=None):
//|     """Alpha blend the two source bitmaps into the destination.
//|
//|     It is permitted for the destination bitmap to be one of the two
//|     source bitmaps.
//|
//|     :param bitmap dest_bitmap: Destination bitmap that will be written into
//|     :param bitmap source_bitmap_1: The first source bitmap
//|     :param bitmap source_bitmap_2: The second source bitmap
//|     :param float factor1: The proportion of bitmap 1 to mix in
//|     :param float factor2: The proportion of bitmap 2 to mix in.  If specified as `None`, ``1-factor1`` is used.  Usually the proportions should sum to 1.
//|     :param displayio.Colorspace colorspace: The colorspace of the bitmaps. They must all have the same colorspace.  Only the following colorspaces are permitted:  ``L8``, ``RGB565``, ``RGB565_SWAPPED``, ``BGR565`` and ``BGR565_SWAPPED``.
//|
//|     For the L8 colorspace, the bitmaps must have a bits-per-value of 8.
//|     For the RGB colorspaces, they must have a bits-per-value of 16."""
//|

STATIC mp_obj_t bitmaptools_alphablend(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum {ARG_dest_bitmap, ARG_source_bitmap_1, ARG_source_bitmap_2, ARG_colorspace, ARG_factor_1, ARG_factor_2};

    static const mp_arg_t allowed_args[] = {
        {MP_QSTR_dest_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = NULL}},
        {MP_QSTR_source_bitmap_1, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = NULL}},
        {MP_QSTR_source_bitmap_2, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = NULL}},
        {MP_QSTR_colorspace, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = NULL}},
        {MP_QSTR_factor_1, MP_ARG_OBJ, {.u_obj = MP_ROM_NONE}},
        {MP_QSTR_factor_2, MP_ARG_OBJ, {.u_obj = MP_ROM_NONE}},
    };
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(mp_arg_validate_type(args[ARG_dest_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_dest_bitmap)); // the destination bitmap
    displayio_bitmap_t *source1 = MP_OBJ_TO_PTR(mp_arg_validate_type(args[ARG_source_bitmap_1].u_obj, &displayio_bitmap_type, MP_QSTR_source_bitmap_1)); // the first source bitmap
    displayio_bitmap_t *source2 = MP_OBJ_TO_PTR(mp_arg_validate_type(args[ARG_source_bitmap_2].u_obj, &displayio_bitmap_type, MP_QSTR_source_bitmap_2)); // the second source bitmap

    mp_float_t factor1 = (args[ARG_factor_1].u_obj == mp_const_none) ? MICROPY_FLOAT_CONST(.5) : mp_obj_float_get(args[ARG_factor_1].u_obj);
    mp_float_t factor2 = (args[ARG_factor_2].u_obj == mp_const_none) ? 1 - factor1 : mp_obj_float_get(args[ARG_factor_2].u_obj);

    displayio_colorspace_t colorspace = (displayio_colorspace_t)cp_enum_value(&displayio_colorspace_type, args[ARG_colorspace].u_obj);

    if (destination->width != source1->width
        || destination->height != source1->height
        || destination->bits_per_value != source1->bits_per_value
        || destination->width != source2->width
        || destination->height != source2->height
        || destination->bits_per_value != source2->bits_per_value
        ) {
        mp_raise_ValueError(translate("Bitmap size and bits per value must match"));
    }

    switch (colorspace) {
        case DISPLAYIO_COLORSPACE_L8:
            if (destination->bits_per_value != 8) {
                mp_raise_ValueError(translate("For L8 colorspace, input bitmap must have 8 bits per pixel"));
            }
            break;

        case DISPLAYIO_COLORSPACE_RGB565:
        case DISPLAYIO_COLORSPACE_RGB565_SWAPPED:
        case DISPLAYIO_COLORSPACE_BGR565:
        case DISPLAYIO_COLORSPACE_BGR565_SWAPPED:
            if (destination->bits_per_value != 16) {
                mp_raise_ValueError(translate("For RGB colorspaces, input bitmap must have 16 bits per pixel"));
            }
            break;

        default:
            mp_raise_ValueError(translate("Unsupported colorspace"));
    }

    common_hal_bitmaptools_alphablend(destination, source1, source2, colorspace, factor1, factor2);

    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(bitmaptools_alphablend_obj, 0, bitmaptools_alphablend);

//|
//| def fill_region(
//|        dest_bitmap: displayio.Bitmap,
//|        x1: int, y1: int,
//|        x2: int, y2: int,
//|        value: int) -> None:
//|      """Draws the color value into the destination bitmap within the
//|      rectangular region bounded by (x1,y1) and (x2,y2), exclusive.
//|
//|      :param bitmap dest_bitmap: Destination bitmap that will be written into
//|      :param int x1: x-pixel position of the first corner of the rectangular fill region
//|      :param int y1: y-pixel position of the first corner of the rectangular fill region
//|      :param int x2: x-pixel position of the second corner of the rectangular fill region (exclusive)
//|      :param int y2: y-pixel position of the second corner of the rectangular fill region (exclusive)
//|      :param int value: Bitmap palette index that will be written into the rectangular
//|             fill region in the destination bitmap"""
//|      ...
//|
STATIC mp_obj_t bitmaptools_obj_fill_region(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum {ARG_dest_bitmap, ARG_x1, ARG_y1, ARG_x2, ARG_y2, ARG_value};

    static const mp_arg_t allowed_args[] = {
        {MP_QSTR_dest_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_x1, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_y1, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_x2, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_y2, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_value, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
    };
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(args[ARG_dest_bitmap].u_obj);     // the destination bitmap

    uint32_t value, color_depth;
    value = args[ARG_value].u_int;
    color_depth = (1 << destination->bits_per_value);
    if (color_depth <= value) {
        mp_raise_ValueError(translate("out of range of target"));
    }

    int16_t x1 = args[ARG_x1].u_int;
    int16_t y1 = args[ARG_y1].u_int;
    int16_t x2 = args[ARG_x2].u_int;
    int16_t y2 = args[ARG_y2].u_int;

    common_hal_bitmaptools_fill_region(destination, x1, y1, x2, y2, value);

    return mp_const_none;
}

MP_DEFINE_CONST_FUN_OBJ_KW(bitmaptools_fill_region_obj, 0, bitmaptools_obj_fill_region);
//|
//| def boundary_fill(
//|        dest_bitmap: displayio.Bitmap,
//|        x: int, y: int,
//|        fill_color_value: int, replaced_color_value: int) -> None:
//|      """Draws the color value into the destination bitmap enclosed
//|      area of pixels of the background_value color. Like "Paint Bucket"
//|      fill tool.
//|
//|      :param bitmap dest_bitmap: Destination bitmap that will be written into
//|      :param int x: x-pixel position of the first pixel to check and fill if needed
//|      :param int y: y-pixel position of the first pixel to check and fill if needed
//|      :param int fill_color_value: Bitmap palette index that will be written into the
//|             enclosed area in the destination bitmap
//|      :param int replaced_color_value: Bitmap palette index that will filled with the
//|             value color in the enclosed area in the destination bitmap"""
//|      ...
//|
STATIC mp_obj_t bitmaptools_obj_boundary_fill(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum {ARG_dest_bitmap, ARG_x, ARG_y, ARG_fill_color_value, ARG_replaced_color_value};

    static const mp_arg_t allowed_args[] = {
        {MP_QSTR_dest_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_x, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_y, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_fill_color_value, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_replaced_color_value, MP_ARG_INT, {.u_int = INT_MAX} },
    };
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(mp_arg_validate_type(args[ARG_dest_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_dest_bitmap));     // the destination bitmap

    uint32_t fill_color_value, color_depth;
    fill_color_value = args[ARG_fill_color_value].u_int;
    color_depth = (1 << destination->bits_per_value);
    if (color_depth <= fill_color_value) {
        mp_raise_ValueError(translate("value out of range of target"));
    }

    uint32_t replaced_color_value;
    replaced_color_value = args[ARG_replaced_color_value].u_int;
    if (replaced_color_value != INT_MAX && color_depth <= replaced_color_value) {
        mp_raise_ValueError(translate("background value out of range of target"));
    }

    int16_t x = args[ARG_x].u_int;
    int16_t y = args[ARG_y].u_int;

    if (x < 0 || x >= destination->width) {
        mp_raise_ValueError(translate("out of range of target"));
    }
    if (y < 0 || y >= destination->height) {
        mp_raise_ValueError(translate("out of range of target"));
    }

    common_hal_bitmaptools_boundary_fill(destination, x, y, fill_color_value, replaced_color_value);

    return mp_const_none;
}

MP_DEFINE_CONST_FUN_OBJ_KW(bitmaptools_boundary_fill_obj, 0, bitmaptools_obj_boundary_fill);
// requires all 6 arguments

//|
//| def draw_line(
//|        dest_bitmap: displayio.Bitmap,
//|        x1: int, y1: int,
//|        x2: int, y2: int,
//|        value: int) -> None:
//|      """Draws a line into a bitmap specified two endpoints (x1,y1) and (x2,y2).
//|
//|      :param bitmap dest_bitmap: Destination bitmap that will be written into
//|      :param int x1: x-pixel position of the line's first endpoint
//|      :param int y1: y-pixel position of the line's first endpoint
//|      :param int x2: x-pixel position of the line's second endpoint
//|      :param int y2: y-pixel position of the line's second endpoint
//|      :param int value: Bitmap palette index that will be written into the
//|             line in the destination bitmap"""
//|      ...
//|
STATIC mp_obj_t bitmaptools_obj_draw_line(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum {ARG_dest_bitmap, ARG_x1, ARG_y1, ARG_x2, ARG_y2, ARG_value};

    static const mp_arg_t allowed_args[] = {
        {MP_QSTR_dest_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_x1, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_y1, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_x2, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_y2, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
        {MP_QSTR_value, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL}},
    };
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(args[ARG_dest_bitmap].u_obj);     // the destination bitmap

    uint32_t value, color_depth;
    value = args[ARG_value].u_int;
    color_depth = (1 << destination->bits_per_value);
    if (color_depth <= value) {
        mp_raise_ValueError(translate("out of range of target"));
    }

    int16_t x1 = args[ARG_x1].u_int;
    int16_t y1 = args[ARG_y1].u_int;
    int16_t x2 = args[ARG_x2].u_int;
    int16_t y2 = args[ARG_y2].u_int;

    // verify points are within the bitmap boundary (inclusive)
    if ((x1 < 0) || (x2 < 0) || (y1 < 0) || (y2 < 0) ||
        (x1 >= destination->width) || (x2 >= destination->width) ||
        (y1 >= destination->height) || (y2 >= destination->height)) {
        mp_raise_ValueError(translate("out of range of target"));
    }

    common_hal_bitmaptools_draw_line(destination, x1, y1, x2, y2, value);

    return mp_const_none;
}

MP_DEFINE_CONST_FUN_OBJ_KW(bitmaptools_draw_line_obj, 0, bitmaptools_obj_draw_line);
// requires all 6 arguments

//| def arrayblit(bitmap: displayio.Bitmap, data: ReadableBuffer, x1: int=0, y1: int=0, x2: Optional[int]=None, y2: Optional[int]=None, skip_index:Optional[int]=None) -> None:
//|     """Inserts pixels from ``data`` into the rectangle of width×height pixels with the upper left corner at ``(x,y)``
//|
//|     The values from ``data`` are taken modulo the number of color values
//|     avalable in the destination bitmap.
//|
//|     If x1 or y1 are not specified, they are taken as 0.  If x2 or y2
//|     are not specified, or are given as -1, they are taken as the width
//|     and height of the image.
//|
//|     The coordinates affected by the blit are ``x1 <= x < x2`` and ``y1 <= y < y2``.
//|
//|     ``data`` must contain at least as many elements as required.  If it
//|     contains excess elements, they are ignored.
//|
//|     The blit takes place by rows, so the first elements of ``data`` go
//|     to the first row, the next elements to the next row, and so on.
//|
//|     :param displayio.Bitmap bitmap: A writable bitmap
//|     :param ReadableBuffer data: Buffer containing the source pixel values
//|     :param int x1: The left corner of the area to blit into (inclusive)
//|     :param int y1: The top corner of the area to blit into (inclusive)
//|     :param int x2: The right of the area to blit into (exclusive)
//|     :param int y2: The bottom corner of the area to blit into (exclusive)
//|     :param int skip_index: Bitmap palette index in the source that will not be copied,
//|             set to None to copy all pixels
//|     """
//|     ...
//|
STATIC mp_obj_t bitmaptools_arrayblit(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum { ARG_bitmap, ARG_data, ARG_x1, ARG_y1, ARG_x2, ARG_y2, ARG_skip_index };
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
        { MP_QSTR_data, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
        { MP_QSTR_x1, MP_ARG_INT, {.u_int = 0} },
        { MP_QSTR_y1, MP_ARG_INT, {.u_int = 0} },
        { MP_QSTR_x2, MP_ARG_INT, {.u_int = -1} },
        { MP_QSTR_y2, MP_ARG_INT, {.u_int = -1} },
        { MP_QSTR_skip_index, MP_ARG_OBJ, {.u_obj = mp_const_none } },
    };
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    displayio_bitmap_t *bitmap = mp_arg_validate_type(args[ARG_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_bitmap);

    mp_buffer_info_t bufinfo;
    mp_get_buffer_raise(args[ARG_data].u_obj, &bufinfo, MP_BUFFER_READ);

    int x1 = args[ARG_x1].u_int;
    int y1 = args[ARG_y1].u_int;
    int x2 = args[ARG_x2].u_int == -1 ? bitmap->width : args[ARG_x2].u_int;
    int y2 = args[ARG_y2].u_int == -1 ? bitmap->height : args[ARG_y2].u_int;

    if ((x1 < 0) || (y1 < 0) || (x1 > x2) || (y1 > y2) || (x2 > bitmap->width) || (y2 > bitmap->height)) {
        mp_raise_IndexError(translate("pixel coordinates out of bounds"));
    }

    size_t output_element_count = (x2 - x1) * (y2 - y1);
    size_t element_size = mp_binary_get_size('@', bufinfo.typecode, NULL);
    size_t input_element_count = bufinfo.len / element_size;

    bool skip_specified = args[ARG_skip_index].u_obj != mp_const_none;
    uint32_t skip_index = skip_specified ? mp_obj_get_int(args[ARG_skip_index].u_obj) : 0;
    if (input_element_count < output_element_count) {
        mp_raise_IndexError(translate("index out of range"));
    }

    common_hal_bitmaptools_arrayblit(bitmap, bufinfo.buf, element_size, x1, y1, x2, y2, skip_specified, skip_index);

    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(bitmaptools_arrayblit_obj, 0, bitmaptools_arrayblit);


//| def readinto(bitmap: displayio.Bitmap, file: typing.BinaryIO, bits_per_pixel: int, element_size: int = 1, reverse_pixels_in_element: bool = False, swap_bytes_in_element: bool = False, reverse_rows: bool = False) -> None:
//|     """Reads from a binary file into a bitmap.
//|
//|     The file must be positioned so that it consists of ``bitmap.height`` rows of pixel data, where each row is the smallest multiple of ``element_size`` bytes that can hold ``bitmap.width`` pixels.
//|
//|     The bytes in an element can be optionally swapped, and the pixels in an element can be reversed.  Also, the
//|     row loading direction can be reversed, which may be requires for loading certain bitmap files.
//|
//|     This function doesn't parse image headers, but is useful to speed up loading of uncompressed image formats such as PCF glyph data.
//|
//|     :param displayio.Bitmap bitmap: A writable bitmap
//|     :param typing.BinaryIO file: A file opened in binary mode
//|     :param int bits_per_pixel: Number of bits per pixel.  Values 1, 2, 4, 8, 16, 24, and 32 are supported;
//|     :param int element_size: Number of bytes per element.  Values of 1, 2, and 4 are supported, except that 24 ``bits_per_pixel`` requires 1 byte per element.
//|     :param bool reverse_pixels_in_element: If set, the first pixel in a word is taken from the Most Signficant Bits; otherwise, it is taken from the Least Significant Bits.
//|     :param bool swap_bytes_in_element: If the ``element_size`` is not 1, then reverse the byte order of each element read.
//|     :param bool reverse_rows: Reverse the direction of the row loading (required for some bitmap images).
//|     """
//|     ...
//|

STATIC mp_obj_t bitmaptools_readinto(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum { ARG_bitmap, ARG_file, ARG_bits_per_pixel, ARG_element_size, ARG_reverse_pixels_in_element, ARG_swap_bytes_in_element, ARG_reverse_rows };
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
        { MP_QSTR_file, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
        { MP_QSTR_bits_per_pixel, MP_ARG_REQUIRED | MP_ARG_INT, {.u_obj = MP_OBJ_NULL} },
        { MP_QSTR_element_size, MP_ARG_INT, { .u_int = 1 } },
        { MP_QSTR_reverse_pixels_in_element, MP_ARG_BOOL, { .u_bool = false } },
        { MP_QSTR_swap_bytes_in_element,  MP_ARG_BOOL, { .u_bool = false } },
        { MP_QSTR_reverse_rows,  MP_ARG_BOOL, { .u_bool = false } },
    };

    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    displayio_bitmap_t *bitmap = mp_arg_validate_type(args[ARG_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_bitmap);

    pyb_file_obj_t *file = mp_arg_validate_type(args[ARG_file].u_obj, &mp_type_fileio, MP_QSTR_file);

    int element_size = args[ARG_element_size].u_int;
    if (element_size != 1 && element_size != 2 && element_size != 4) {
        mp_raise_ValueError_varg(translate("invalid element_size %d, must be, 1, 2, or 4"), element_size);
    }

    int bits_per_pixel = args[ARG_bits_per_pixel].u_int;
    switch (bits_per_pixel) {
        case 24:
            if (element_size != 1) {
                mp_raise_ValueError_varg(translate("invalid element size %d for bits_per_pixel %d\n"), element_size, bits_per_pixel);
            }
            break;
        case 1:
        case 2:
        case 4:
        case 8:
        case 16:
        case 32:
            break;
        default:
            mp_raise_ValueError_varg(translate("invalid bits_per_pixel %d, must be, 1, 2, 4, 8, 16, 24, or 32"), bits_per_pixel);
    }

    bool reverse_pixels_in_element = args[ARG_reverse_pixels_in_element].u_bool;
    bool swap_bytes_in_element = args[ARG_swap_bytes_in_element].u_bool;
    bool reverse_rows = args[ARG_reverse_rows].u_bool;

    common_hal_bitmaptools_readinto(bitmap, file, element_size, bits_per_pixel, reverse_pixels_in_element, swap_bytes_in_element, reverse_rows);

    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(bitmaptools_readinto_obj, 0, bitmaptools_readinto);

//| class DitherAlgorithm:
//|     """Identifies the algorith for dither to use"""
//|
//|     Atkinson: "DitherAlgorithm"
//|     """The classic Atkinson dither, often associated with the Hypercard esthetic"""
//|
//|     FloydStenberg: "DitherAlgorithm"
//|     """The Floyd-Stenberg dither"""
//|
MAKE_ENUM_VALUE(bitmaptools_dither_algorithm_type, dither_algorithm, Atkinson, DITHER_ALGORITHM_ATKINSON);
MAKE_ENUM_VALUE(bitmaptools_dither_algorithm_type, dither_algorithm, FloydStenberg, DITHER_ALGORITHM_ATKINSON);

MAKE_ENUM_MAP(bitmaptools_dither_algorithm) {
    MAKE_ENUM_MAP_ENTRY(dither_algorithm, Atkinson),
    MAKE_ENUM_MAP_ENTRY(dither_algorithm, FloydStenberg),
};
STATIC MP_DEFINE_CONST_DICT(bitmaptools_dither_algorithm_locals_dict, bitmaptools_dither_algorithm_locals_table);

MAKE_PRINTER(bitmaptools, bitmaptools_dither_algorithm);

MAKE_ENUM_TYPE(bitmaptools, DitherAlgorithm, bitmaptools_dither_algorithm);

//| def dither(dest_bitmap: displayio.Bitmap, source_bitmapp: displayio.Bitmap, source_colorspace: displayio.Colorspace, algorithm: DitherAlgorithm=DitherAlgorithm.Atkinson) -> None:
//|     """Convert the input image into a 2-level output image using the given dither algorithm.
//|
//|     :param bitmap dest_bitmap: Destination bitmap.  It must have a value_count of 2 or 65536.  The stored values are 0 and the maximum pixel value.
//|     :param bitmap source_bitmap: Source bitmap that contains the graphical region to be dithered.  It must have a value_count of 65536.
//|     :param colorspace: The colorspace of the image.  The supported colorspaces are ``RGB565``, ``BGR565``, ``RGB565_SWAPPED``, and ``BGR565_SWAPPED``
//|     :param algorithm: The dither algorithm to use, one of the `DitherAlgorithm` values.
//|     """
//|     ...
//|
STATIC mp_obj_t bitmaptools_dither(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum { ARG_dest_bitmap, ARG_source_bitmap, ARG_source_colorspace, ARG_algorithm };
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_dest_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
        { MP_QSTR_source_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
        { MP_QSTR_source_colorspace, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
        { MP_QSTR_algorithm, MP_ARG_OBJ, { .u_obj = MP_ROM_PTR((void *)&dither_algorithm_Atkinson_obj) } },
    };
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
    displayio_bitmap_t *source_bitmap = mp_arg_validate_type(args[ARG_source_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_source_bitmap);
    displayio_bitmap_t *dest_bitmap = mp_arg_validate_type(args[ARG_dest_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_dest_bitmap);
    bitmaptools_dither_algorithm_t algorithm = cp_enum_value(&bitmaptools_dither_algorithm_type, args[ARG_algorithm].u_obj);
    displayio_colorspace_t colorspace = cp_enum_value(&displayio_colorspace_type, args[ARG_source_colorspace].u_obj);

    if (source_bitmap->width != dest_bitmap->width || source_bitmap->height != dest_bitmap->height) {
        mp_raise_TypeError(translate("bitmap sizes must match"));
    }

    if (dest_bitmap->bits_per_value != 16 && dest_bitmap->bits_per_value != 1) {
        mp_raise_TypeError(translate("source_bitmap must have value_count of 2 or 65536"));
    }


    switch (colorspace) {
        case DISPLAYIO_COLORSPACE_RGB565:
        case DISPLAYIO_COLORSPACE_RGB565_SWAPPED:
        case DISPLAYIO_COLORSPACE_BGR565:
        case DISPLAYIO_COLORSPACE_BGR565_SWAPPED:
            if (source_bitmap->bits_per_value != 16) {
                mp_raise_TypeError(translate("source_bitmap must have value_count of 65536"));
            }
            break;

        case DISPLAYIO_COLORSPACE_L8:
            if (source_bitmap->bits_per_value != 8) {
                mp_raise_TypeError(translate("source_bitmap must have value_count of 8"));
            }
            break;

        default:
            mp_raise_TypeError(translate("unsupported colorspace for dither"));
    }


    common_hal_bitmaptools_dither(dest_bitmap, source_bitmap, colorspace, algorithm);

    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(bitmaptools_dither_obj, 0, bitmaptools_dither);


STATIC const mp_rom_map_elem_t bitmaptools_module_globals_table[] = {
    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_bitmaptools) },
    { MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&bitmaptools_readinto_obj) },
    { MP_ROM_QSTR(MP_QSTR_rotozoom), MP_ROM_PTR(&bitmaptools_rotozoom_obj) },
    { MP_ROM_QSTR(MP_QSTR_arrayblit), MP_ROM_PTR(&bitmaptools_arrayblit_obj) },
    { MP_ROM_QSTR(MP_QSTR_alphablend), MP_ROM_PTR(&bitmaptools_alphablend_obj) },
    { MP_ROM_QSTR(MP_QSTR_fill_region), MP_ROM_PTR(&bitmaptools_fill_region_obj) },
    { MP_ROM_QSTR(MP_QSTR_boundary_fill), MP_ROM_PTR(&bitmaptools_boundary_fill_obj) },
    { MP_ROM_QSTR(MP_QSTR_draw_line), MP_ROM_PTR(&bitmaptools_draw_line_obj) },
    { MP_ROM_QSTR(MP_QSTR_dither), MP_ROM_PTR(&bitmaptools_dither_obj) },
    { MP_ROM_QSTR(MP_QSTR_DitherAlgorithm), MP_ROM_PTR(&bitmaptools_dither_algorithm_type) },
};
STATIC MP_DEFINE_CONST_DICT(bitmaptools_module_globals, bitmaptools_module_globals_table);

const mp_obj_module_t bitmaptools_module = {
    .base = {&mp_type_module },
    .globals = (mp_obj_dict_t *)&bitmaptools_module_globals,
};

MP_REGISTER_MODULE(MP_QSTR_bitmaptools, bitmaptools_module, CIRCUITPY_BITMAPTOOLS);