circuitpython/shared-module/_stage/__init__.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2017 Radomir Dopieralski
 *
 * 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 "Layer.h"
#include "Text.h"
#include "__init__.h"
#include "shared-bindings/_stage/Layer.h"
#include "shared-bindings/_stage/Text.h"


void render_stage(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1,
        mp_obj_t *layers, size_t layers_size,
        uint16_t *buffer, size_t buffer_size,
        displayio_display_obj_t *display,
        uint8_t scale, uint16_t background) {


    displayio_area_t area;
    area.x1 = x0;
    area.y1 = y0;
    area.x2 = x1;
    area.y2 = y1;
    displayio_display_core_set_region_to_update(
        &display->core, display->set_column_command, display->set_row_command,
        NO_COMMAND, NO_COMMAND, display->data_as_commands, false, &area, display->SH1107_addressing);

    while (!displayio_display_core_begin_transaction(&display->core)) {
        RUN_BACKGROUND_TASKS;
    }
    display->core.send(display->core.bus, DISPLAY_COMMAND,
                      CHIP_SELECT_TOGGLE_EVERY_BYTE,
                      &display->write_ram_command, 1);
    size_t index = 0;
    for (uint16_t y = y0; y < y1; ++y) {
        for (uint8_t yscale = 0; yscale < scale; ++yscale) {
            for (uint16_t x = x0; x < x1; ++x) {
                uint16_t c = TRANSPARENT;
                for (size_t layer = 0; layer < layers_size; ++layer) {
                    layer_obj_t *obj = MP_OBJ_TO_PTR(layers[layer]);
                    if (obj->base.type == &mp_type_layer) {
                        c = get_layer_pixel(obj, x, y);
                    } else if (obj->base.type == &mp_type_text) {
                        c = get_text_pixel((text_obj_t *)obj, x, y);
                    }
                    if (c != TRANSPARENT) {
                        break;
                    }
                }
                if (c == TRANSPARENT) {
                    c = background;
                }
                for (uint8_t xscale = 0; xscale < scale; ++xscale) {
                    buffer[index] = c;
                    index += 1;
                    // The buffer is full, send it.
                    if (index >= buffer_size) {
                        display->core.send(display->core.bus, DISPLAY_DATA,
                                           CHIP_SELECT_UNTOUCHED,
                                           ((uint8_t*)buffer), buffer_size * 2);
                        index = 0;
                    }
                }
            }
        }
    }
    // Send the remaining data.
    if (index) {
        display->core.send(display->core.bus, DISPLAY_DATA,
                           CHIP_SELECT_UNTOUCHED,
                           ((uint8_t*)buffer), index * 2);
    }

    displayio_display_core_end_transaction(&display->core);
}