circuitpython/shared-bindings/displayio/Bitmap.c

/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
 *
 * 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-module/displayio/Bitmap.h"

#include <stdint.h>

#include "lib/utils/context_manager_helpers.h"
#include "py/binary.h"
#include "py/objproperty.h"
#include "py/runtime.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/util.h"
#include "supervisor/shared/translate.h"

//| class Bitmap:
//|     """Stores values of a certain size in a 2D array
//|
//| Bitmaps can be treated as read-only buffers. If the number of bits in a pixel is 8, 16, or 32; and the number of bytes
//| per row is a multiple of 4, then the resulting memoryview will correspond directly with the bitmap's contents. Otherwise,
//| the bitmap data is packed into the memoryview with unspecified padding.
//|
//| A Bitmap can be treated as a buffer, allowing its content to be
//| viewed and modified using e.g., with ``ulab.numpy.frombuffer``,
//| but the `displayio.Bitmap.dirty` method must be used to inform
//| displayio when a bitmap was modified through the buffer interface.
//|
//| `bitmaptools.arrayblit` can also be useful to move data efficiently
//| into a Bitmap.
//| """
//|
//|     def __init__(self, width: int, height: int, value_count: int) -> None:
//|         """Create a Bitmap object with the given fixed size. Each pixel stores a value that is used to
//|         index into a corresponding palette. This enables differently colored sprites to share the
//|         underlying Bitmap. value_count is used to minimize the memory used to store the Bitmap.
//|
//|         :param int width: The number of values wide
//|         :param int height: The number of values high
//|         :param int value_count: The number of possible pixel values."""
//|         ...
//|
STATIC mp_obj_t displayio_bitmap_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    mp_arg_check_num(n_args, kw_args, 3, 3, false);
    uint32_t width = mp_obj_get_int(pos_args[0]);
    uint32_t height = mp_obj_get_int(pos_args[1]);
    uint32_t value_count = mp_obj_get_int(pos_args[2]);
    uint32_t bits = 1;

    if (value_count == 0) {
        mp_raise_ValueError(translate("value_count must be > 0"));
    }
    while ((value_count - 1) >> bits) {
        if (bits < 8) {
            bits <<= 1;
        } else {
            bits += 8;
        }
    }

    displayio_bitmap_t *self = m_new_obj(displayio_bitmap_t);
    self->base.type = &displayio_bitmap_type;
    common_hal_displayio_bitmap_construct(self, width, height, bits);

    return MP_OBJ_FROM_PTR(self);
}
//|     width: int
//|     """Width of the bitmap. (read only)"""
//|
STATIC mp_obj_t displayio_bitmap_obj_get_width(mp_obj_t self_in) {
    displayio_bitmap_t *self = MP_OBJ_TO_PTR(self_in);

    return MP_OBJ_NEW_SMALL_INT(common_hal_displayio_bitmap_get_width(self));
}

MP_DEFINE_CONST_FUN_OBJ_1(displayio_bitmap_get_width_obj, displayio_bitmap_obj_get_width);

const mp_obj_property_t displayio_bitmap_width_obj = {
    .base.type = &mp_type_property,
    .proxy = {(mp_obj_t)&displayio_bitmap_get_width_obj,
              (mp_obj_t)&mp_const_none_obj,
              (mp_obj_t)&mp_const_none_obj},
};

//|     height: int
//|     """Height of the bitmap. (read only)"""
//|
STATIC mp_obj_t displayio_bitmap_obj_get_height(mp_obj_t self_in) {
    displayio_bitmap_t *self = MP_OBJ_TO_PTR(self_in);

    return MP_OBJ_NEW_SMALL_INT(common_hal_displayio_bitmap_get_height(self));
}

MP_DEFINE_CONST_FUN_OBJ_1(displayio_bitmap_get_height_obj, displayio_bitmap_obj_get_height);

const mp_obj_property_t displayio_bitmap_height_obj = {
    .base.type = &mp_type_property,
    .proxy = {(mp_obj_t)&displayio_bitmap_get_height_obj,
              (mp_obj_t)&mp_const_none_obj,
              (mp_obj_t)&mp_const_none_obj},
};

//|     def __getitem__(self, index: Union[Tuple[int, int], int]) -> int:
//|         """Returns the value at the given index. The index can either be an x,y tuple or an int equal
//|         to ``y * width + x``.
//|
//|         This allows you to::
//|
//|           print(bitmap[0,1])"""
//|         ...
//|
//|     def __setitem__(self, index: Union[Tuple[int, int], int], value: int) -> None:
//|         """Sets the value at the given index. The index can either be an x,y tuple or an int equal
//|         to ``y * width + x``.
//|
//|         This allows you to::
//|
//|           bitmap[0,1] = 3"""
//|         ...
//|
STATIC mp_obj_t bitmap_subscr(mp_obj_t self_in, mp_obj_t index_obj, mp_obj_t value_obj) {
    if (value_obj == mp_const_none) {
        // delete item
        mp_raise_AttributeError(translate("Cannot delete values"));
        return mp_const_none;
    }

    displayio_bitmap_t *self = MP_OBJ_TO_PTR(self_in);

    if (mp_obj_is_type(index_obj, &mp_type_slice)) {
        // TODO(tannewt): Implement subscr after slices support start, stop and step tuples.
        mp_raise_NotImplementedError(translate("Slices not supported"));
        return mp_const_none;
    }

    uint16_t x = 0;
    uint16_t y = 0;
    if (mp_obj_is_small_int(index_obj)) {
        mp_int_t i = MP_OBJ_SMALL_INT_VALUE(index_obj);
        uint16_t width = common_hal_displayio_bitmap_get_width(self);
        x = i % width;
        y = i / width;
    } else {
        mp_obj_t *items;
        mp_obj_get_array_fixed_n(index_obj, 2, &items);
        x = mp_obj_get_int(items[0]);
        y = mp_obj_get_int(items[1]);
        if (x >= common_hal_displayio_bitmap_get_width(self) || y >= common_hal_displayio_bitmap_get_height(self)) {
            mp_raise_IndexError(translate("pixel coordinates out of bounds"));
        }
    }

    if (value_obj == MP_OBJ_SENTINEL) {
        // load
        return MP_OBJ_NEW_SMALL_INT(common_hal_displayio_bitmap_get_pixel(self, x, y));
    } else {
        mp_uint_t value = (mp_uint_t)mp_obj_get_int(value_obj);
        if ((value >> common_hal_displayio_bitmap_get_bits_per_value(self)) != 0) {
            mp_raise_ValueError(translate("pixel value requires too many bits"));
        }
        common_hal_displayio_bitmap_set_pixel(self, x, y, value);
    }
    return mp_const_none;
}

//|     def blit(self, x: int, y: int, source_bitmap: Bitmap, *, x1: int, y1: int, x2: int, y2: int, skip_index: int) -> None:
//|         """Inserts the source_bitmap region defined by rectangular boundaries
//|                     (x1,y1) and (x2,y2) into the bitmap at the specified (x,y) location.
//|
//|         :param int x: Horizontal pixel location in bitmap where source_bitmap upper-left
//|                       corner will be placed
//|         :param int y: Vertical pixel location in bitmap where source_bitmap upper-left
//|                       corner will be placed
//|         :param bitmap source_bitmap: Source bitmap that contains the graphical region to be copied
//|         :param int x1: Minimum x-value for rectangular bounding box to be copied from the source bitmap
//|         :param int y1: Minimum y-value for rectangular bounding box to be copied from the source bitmap
//|         :param int x2: Maximum x-value (exclusive) for rectangular bounding box to be copied from the source bitmap
//|         :param int y2: Maximum y-value (exclusive) for rectangular bounding box to be copied from the source bitmap
//|         :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 displayio_bitmap_obj_blit(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum {ARG_x, ARG_y, ARG_source, ARG_x1, ARG_y1, ARG_x2, ARG_y2, ARG_skip_index};
    static const mp_arg_t allowed_args[] = {
        {MP_QSTR_x, MP_ARG_REQUIRED | MP_ARG_INT},
        {MP_QSTR_y, MP_ARG_REQUIRED | MP_ARG_INT},
        {MP_QSTR_source_bitmap, MP_ARG_REQUIRED | MP_ARG_OBJ},
        {MP_QSTR_x1, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
        {MP_QSTR_y1, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
        {MP_QSTR_x2, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} }, // None convert to source->width
        {MP_QSTR_y2, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} }, // None convert to source->height
        {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 - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    displayio_bitmap_t *self = MP_OBJ_TO_PTR(pos_args[0]);

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

    displayio_bitmap_t *source = MP_OBJ_TO_PTR(args[ARG_source].u_obj);

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

    int16_t x1 = args[ARG_x1].u_int;
    int16_t y1 = args[ARG_y1].u_int;
    int16_t x2, y2;
    // if x2 or y2 is None, then set as the maximum size of the source bitmap
    if (args[ARG_x2].u_obj == mp_const_none) {
        x2 = source->width;
    } else {
        x2 = mp_obj_get_int(args[ARG_x2].u_obj);
    }
    // int16_t y2;
    if (args[ARG_y2].u_obj == mp_const_none) {
        y2 = source->height;
    } else {
        y2 = mp_obj_get_int(args[ARG_y2].u_obj);
    }

    // Check x,y are within self (target) bitmap boundary
    if ((x < 0) || (y < 0) || (x > self->width) || (y > self->height)) {
        mp_raise_ValueError(translate("out of range of target"));
    }
    // Check x1,y1,x2,y2 are within source bitmap boundary
    if ((x1 < 0) || (x1 > source->width) ||
        (y1 < 0) || (y1 > source->height) ||
        (x2 < 0) || (x2 > source->width) ||
        (y2 < 0) || (y2 > source->height)) {
        mp_raise_ValueError(translate("out of range of source"));
    }

    // Ensure x1 < x2 and y1 < y2
    if (x1 > x2) {
        int16_t temp = x2;
        x2 = x1;
        x1 = temp;
    }
    if (y1 > y2) {
        int16_t temp = y2;
        y2 = y1;
        y1 = temp;
    }

    uint32_t skip_index;
    bool skip_index_none; // flag whether 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_displayio_bitmap_blit(self, x, y, source, x1, y1, x2, y2, skip_index, skip_index_none);

    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(displayio_bitmap_blit_obj, 4, displayio_bitmap_obj_blit);
// `displayio_bitmap_obj_blit` requires at least 4 arguments

//|     def fill(self, value: int) -> None:
//|         """Fills the bitmap with the supplied palette index value."""
//|         ...
//|
STATIC mp_obj_t displayio_bitmap_obj_fill(mp_obj_t self_in, mp_obj_t value_obj) {
    displayio_bitmap_t *self = MP_OBJ_TO_PTR(self_in);

    mp_uint_t value = (mp_uint_t)mp_obj_get_int(value_obj);
    if ((value >> common_hal_displayio_bitmap_get_bits_per_value(self)) != 0) {
        mp_raise_ValueError(translate("pixel value requires too many bits"));
    }
    common_hal_displayio_bitmap_fill(self, value);

    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_2(displayio_bitmap_fill_obj, displayio_bitmap_obj_fill);

//|     def dirty(self, x1: int=0, y1: int=0, x2: int=-1, y2:int = -1) -> None:
//|         """Inform displayio of bitmap updates done via the buffer
//|         protocol.
//|
//|         :param int x1: Minimum x-value for rectangular bounding box to be considered as modified
//|         :param int y1: Minimum y-value for rectangular bounding box to be considered as modified
//|         :param int x2: Maximum x-value (exclusive) for rectangular bounding box to be considered as modified
//|         :param int y2: Maximum y-value (exclusive) for rectangular bounding box to be considered as modified
//|
//|         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.  Thus, calling dirty() with the
//|         default arguments treats the whole bitmap as modified.
//|
//|         When a bitmap is modified through the buffer protocol, the
//|         display will not be properly updated unless the bitmap is
//|         notified of the "dirty rectangle" that encloses all modified
//|         pixels."""
//|         ...
//|
STATIC mp_obj_t displayio_bitmap_obj_dirty(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    displayio_bitmap_t *self = MP_OBJ_TO_PTR(pos_args[0]);
    enum { ARG_x1, ARG_y1, ARG_x2, ARG_y2 };
    static const mp_arg_t allowed_args[] = {
        { 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_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    displayio_area_t dirty_area = {
        .x1 = args[ARG_x1].u_int,
        .y1 = args[ARG_y1].u_int,
        .x2 = args[ARG_x2].u_int == -1 ? self->width : args[ARG_x2].u_int,
        .y2 = args[ARG_y2].u_int == -1 ? self->height : args[ARG_y2].u_int,
    };

    displayio_bitmap_set_dirty_area(self, &dirty_area);

    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(displayio_bitmap_dirty_obj, 0, displayio_bitmap_obj_dirty);

STATIC const mp_rom_map_elem_t displayio_bitmap_locals_dict_table[] = {
    { MP_ROM_QSTR(MP_QSTR_height), MP_ROM_PTR(&displayio_bitmap_height_obj) },
    { MP_ROM_QSTR(MP_QSTR_width), MP_ROM_PTR(&displayio_bitmap_width_obj) },
    { MP_ROM_QSTR(MP_QSTR_blit), MP_ROM_PTR(&displayio_bitmap_blit_obj) },
    { MP_ROM_QSTR(MP_QSTR_fill), MP_ROM_PTR(&displayio_bitmap_fill_obj) },
    { MP_ROM_QSTR(MP_QSTR_dirty), MP_ROM_PTR(&displayio_bitmap_dirty_obj) },

};
STATIC MP_DEFINE_CONST_DICT(displayio_bitmap_locals_dict, displayio_bitmap_locals_dict_table);

// (the get_buffer protocol returns 0 for success, 1 for failure)
STATIC mp_int_t bitmap_get_buffer(mp_obj_t self_in, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
    displayio_bitmap_t *self = MP_OBJ_TO_PTR(self_in);
    return common_hal_displayio_bitmap_get_buffer(self, bufinfo, flags);
}

const mp_obj_type_t displayio_bitmap_type = {
    { &mp_type_type },
    .name = MP_QSTR_Bitmap,
    .make_new = displayio_bitmap_make_new,
    .subscr = bitmap_subscr,
    .locals_dict = (mp_obj_dict_t *)&displayio_bitmap_locals_dict,
    .buffer_p = { .get_buffer = bitmap_get_buffer },
};