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Shape.c
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126 lines (105 loc) · 3.88 KB
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// This file is part of the CircuitPython project: https://circuitpython.org
//
// SPDX-FileCopyrightText: Copyright (c) 2019 Scott Shawcroft for Adafruit Industries
//
// SPDX-License-Identifier: MIT
#include "shared-bindings/displayio/Shape.h"
#include <string.h>
#include "py/runtime.h"
#include "py/misc.h"
void common_hal_displayio_shape_construct(displayio_shape_t *self, uint32_t width,
uint32_t height, bool mirror_x, bool mirror_y) {
self->mirror_x = mirror_x;
self->mirror_y = mirror_y;
self->width = width;
if (self->mirror_x) {
width /= 2;
width += self->width % 2;
}
self->half_width = width;
self->height = height;
if (self->mirror_y) {
height /= 2;
height += self->height % 2;
}
self->half_height = height;
self->data = m_malloc(height * sizeof(uint32_t));
for (uint16_t i = 0; i < height; i++) {
self->data[2 * i] = 0;
self->data[2 * i + 1] = width;
}
self->dirty_area.x1 = 0;
self->dirty_area.x2 = width;
self->dirty_area.y1 = 0;
self->dirty_area.y2 = height;
}
void common_hal_displayio_shape_set_boundary(displayio_shape_t *self, uint16_t y, uint16_t start_x, uint16_t end_x) {
uint16_t max_y = self->height - 1;
if (self->mirror_y) {
max_y = self->half_height - 1;
}
mp_arg_validate_int_range(y, 0, max_y, MP_QSTR_y);
uint16_t max_x = self->width - 1;
if (self->mirror_x) {
max_x = self->half_width - 1;
}
mp_arg_validate_int_range(start_x, 0, max_x, MP_QSTR_start_x);
mp_arg_validate_int_range(end_x, 0, max_x, MP_QSTR_end_x);
uint16_t lower_x, upper_x, lower_y, upper_y;
// find x-boundaries for updating based on current data and start_x, end_x, and mirror_x
lower_x = MIN(start_x, self->data[2 * y]);
if (self->mirror_x) {
upper_x = self->width - lower_x + 1; // dirty rectangles are treated with max value exclusive
} else {
upper_x = MAX(end_x, self->data[2 * y + 1]) + 1; // dirty rectangles are treated with max value exclusive
}
// find y-boundaries based on y and mirror_y
lower_y = y;
if (self->mirror_y) {
upper_y = self->height - lower_y + 1; // dirty rectangles are treated with max value exclusive
} else {
upper_y = y + 1; // dirty rectangles are treated with max value exclusive
}
self->data[2 * y] = start_x; // update the data array with the new boundaries
self->data[2 * y + 1] = end_x;
if (self->dirty_area.x1 == self->dirty_area.x2) { // Dirty region is empty
self->dirty_area.x1 = lower_x;
self->dirty_area.x2 = upper_x;
self->dirty_area.y1 = lower_y;
self->dirty_area.y2 = upper_y;
} else { // Dirty region is not empty
self->dirty_area.x1 = MIN(lower_x, self->dirty_area.x1);
self->dirty_area.x2 = MAX(upper_x, self->dirty_area.x2);
self->dirty_area.y1 = MIN(lower_y, self->dirty_area.y1);
self->dirty_area.y2 = MAX(upper_y, self->dirty_area.y2);
}
}
uint32_t common_hal_displayio_shape_get_pixel(void *obj, int16_t x, int16_t y) {
displayio_shape_t *self = obj;
if (x >= self->width || x < 0 || y >= self->height || y < 0) {
return 0;
}
if (self->mirror_x && x >= self->half_width) {
x = self->width - x - 1;
}
if (self->mirror_y && y >= self->half_height) {
y = self->height - y - 1;
}
uint16_t start_x = self->data[2 * y];
uint16_t end_x = self->data[2 * y + 1];
if (x < start_x || x > end_x) {
return 0;
}
return 1;
}
displayio_area_t *displayio_shape_get_refresh_areas(displayio_shape_t *self, displayio_area_t *tail) {
if (self->dirty_area.x1 == self->dirty_area.x2) {
return tail;
}
self->dirty_area.next = tail;
return &self->dirty_area;
}
void displayio_shape_finish_refresh(displayio_shape_t *self) {
self->dirty_area.x1 = 0;
self->dirty_area.x2 = 0;
}