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// This file is part of the CircuitPython project: https://circuitpython.org

// SPDX-License-Identifier: MIT

#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,

int16_t vx, int16_t vy,

mp_obj_t *layers, size_t layers_size,

uint16_t *buffer, size_t buffer_size,

busdisplay_busdisplay_obj_t *display,

uint8_t scale, uint16_t background) {

displayio_area_t area;

area.x1 = x0 * scale;

area.y1 = y0 * scale;

area.x2 = x1 * scale;

area.y2 = y1 * scale;

displayio_display_bus_set_region_to_update(&display->bus, &display->core, &area);

while (!displayio_display_bus_begin_transaction(&display->bus)) {

RUN_BACKGROUND_TASKS;

}

display->bus.send(display->bus.bus, DISPLAY_COMMAND,

CHIP_SELECT_TOGGLE_EVERY_BYTE,

&display->write_ram_command, 1);

size_t index = 0;

for (int16_t y = y0 + vy; y < y1 + vy; ++y) {

for (uint8_t yscale = 0; yscale < scale; ++yscale) {

for (int16_t x = x0 + vx; x < x1 + vx; ++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->bus.send(display->bus.bus, DISPLAY_DATA,

CHIP_SELECT_UNTOUCHED,

((uint8_t *)buffer), buffer_size * 2);

index = 0;

}

// Send the remaining data.

if (index) {

display->bus.send(display->bus.bus, DISPLAY_DATA,

CHIP_SELECT_UNTOUCHED,

((uint8_t *)buffer), index * 2);

}

displayio_display_bus_end_transaction(&display->bus);

}

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