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circuitpython/shared-module/_pixelbuf/PixelBuf.c

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/*
* This file is part of the Circuit Python project, https://github.com/adafruit/circuitpython
*
* The MIT License (MIT)
*
* Copyright (c) 2018 Roy Hooper
*
* 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 "py/obj.h"
#include "py/objstr.h"
#include "py/objtype.h"
#include "py/runtime.h"
#include "shared-bindings/_pixelbuf/PixelBuf.h"
#include <string.h>
// Helper to ensure we have the native super class instead of a subclass.
static pixelbuf_pixelbuf_obj_t* native_pixelbuf(mp_obj_t pixelbuf_obj) {
mp_obj_t native_pixelbuf = mp_instance_cast_to_native_base(pixelbuf_obj, &pixelbuf_pixelbuf_type);
mp_obj_assert_native_inited(native_pixelbuf);
return MP_OBJ_TO_PTR(native_pixelbuf);
}
void common_hal__pixelbuf_pixelbuf_construct(pixelbuf_pixelbuf_obj_t *self, size_t n,
pixelbuf_byteorder_details_t* byteorder, mp_float_t brightness, bool auto_write,
uint8_t* header, size_t header_len, uint8_t* trailer, size_t trailer_len) {
self->pixel_count = n;
self->byteorder = *byteorder; // Copied because we modify for dotstar
self->bytes_per_pixel = byteorder->is_dotstar ? 4 : byteorder->bpp;
self->auto_write = false;
size_t pixel_len = self->pixel_count * self->bytes_per_pixel;
self->transmit_buffer_obj = mp_obj_new_bytes_of_zeros(header_len + pixel_len + trailer_len);
mp_obj_str_t *o = MP_OBJ_TO_PTR(self->transmit_buffer_obj);
// Abuse the bytes object a bit by mutating it's data by dropping the const. If the user's
// Python code holds onto it, they'll find out that it changes. At least this way it isn't
// mutable by the code itself.
uint8_t* transmit_buffer = (uint8_t*) o->data;
memcpy(transmit_buffer, header, header_len);
memcpy(transmit_buffer + header_len + pixel_len, trailer, trailer_len);
self->post_brightness_buffer = transmit_buffer + header_len;
if (self->byteorder.is_dotstar) {
// Initialize the buffer with the dotstar start bytes.
// Note: Header and end must be setup by caller
for (uint i = 0; i < self->pixel_count * 4; i += 4) {
self->post_brightness_buffer[i] = DOTSTAR_LED_START_FULL_BRIGHT;
}
}
// Call set_brightness so that it can allocate a second buffer if needed.
self->brightness = 1.0;
common_hal__pixelbuf_pixelbuf_set_brightness(MP_OBJ_FROM_PTR(self), brightness);
// Turn on auto_write. We don't want to do it with the above brightness call.
self->auto_write = auto_write;
}
size_t common_hal__pixelbuf_pixelbuf_get_len(mp_obj_t self_in) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
return self->pixel_count;
}
uint8_t common_hal__pixelbuf_pixelbuf_get_bpp(mp_obj_t self_in) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
return self->byteorder.bpp;
}
mp_obj_t common_hal__pixelbuf_pixelbuf_get_byteorder_string(mp_obj_t self_in) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
return self->byteorder.order_string;
}
bool common_hal__pixelbuf_pixelbuf_get_auto_write(mp_obj_t self_in) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
return self->auto_write;
}
void common_hal__pixelbuf_pixelbuf_set_auto_write(mp_obj_t self_in, bool auto_write) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
self->auto_write = auto_write;
}
mp_float_t common_hal__pixelbuf_pixelbuf_get_brightness(mp_obj_t self_in) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
return self->brightness;
}
void common_hal__pixelbuf_pixelbuf_set_brightness(mp_obj_t self_in, mp_float_t brightness) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
// Skip out if the brightness is already set. The default of self->brightness is 1.0. So, this
// also prevents the pre_brightness_buffer allocation when brightness is set to 1.0 again.
mp_float_t change = brightness - self->brightness;
if (-0.001 < change && change < 0.001) {
return;
}
self->brightness = brightness;
size_t pixel_len = self->pixel_count * self->bytes_per_pixel;
if (self->pre_brightness_buffer == NULL) {
self->pre_brightness_buffer = m_malloc(pixel_len, false);
memcpy(self->pre_brightness_buffer, self->post_brightness_buffer, pixel_len);
}
for (size_t i = 0; i < pixel_len; i++) {
// Don't adjust per-pixel luminance bytes in dotstar mode
if (self->byteorder.is_dotstar && i % 4 == 0) {
continue;
}
self->post_brightness_buffer[i] = self->pre_brightness_buffer[i] * self->brightness;
}
if (self->auto_write) {
common_hal__pixelbuf_pixelbuf_show(self_in);
}
}
uint8_t _pixelbuf_get_as_uint8(mp_obj_t obj) {
if (MP_OBJ_IS_SMALL_INT(obj)) {
return MP_OBJ_SMALL_INT_VALUE(obj);
} else if (MP_OBJ_IS_INT(obj)) {
return mp_obj_get_int_truncated(obj);
} else if (mp_obj_is_float(obj)) {
return (uint8_t)mp_obj_get_float(obj);
}
mp_raise_TypeError_varg(
translate("can't convert %q to %q"), mp_obj_get_type_qstr(obj), MP_QSTR_int);
}
void _pixelbuf_parse_color(pixelbuf_pixelbuf_obj_t* self, mp_obj_t color, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* w) {
pixelbuf_byteorder_details_t *byteorder = &self->byteorder;
// w is shared between white in NeoPixels and brightness in dotstars (so that DotStars can have
// per-pixel brightness). Set the defaults here in case it isn't set below.
if (byteorder->is_dotstar) {
*w = 255;
} else {
*w = 0;
}
if (MP_OBJ_IS_INT(color) || mp_obj_is_float(color)) {
mp_int_t value = MP_OBJ_IS_INT(color) ? mp_obj_get_int_truncated(color) : mp_obj_get_float(color);
*r = value >> 16 & 0xff;
*g = (value >> 8) & 0xff;
*b = value & 0xff;
} else {
mp_obj_t *items;
size_t len;
mp_obj_get_array(color, &len, &items);
if (len < 3 || len > 4) {
mp_raise_ValueError_varg(translate("Expected tuple of length %d, got %d"), byteorder->bpp, len);
}
*r = _pixelbuf_get_as_uint8(items[PIXEL_R]);
*g = _pixelbuf_get_as_uint8(items[PIXEL_G]);
*b = _pixelbuf_get_as_uint8(items[PIXEL_B]);
if (len > 3) {
if (mp_obj_is_float(items[PIXEL_W])) {
*w = 255 * mp_obj_get_float(items[PIXEL_W]);
} else {
*w = mp_obj_get_int_truncated(items[PIXEL_W]);
}
return;
}
}
// Int colors can't set white directly so convert to white when all components are equal.
// Also handles RGBW values assigned an RGB tuple.
if (!byteorder->is_dotstar && byteorder->bpp == 4 && byteorder->has_white && *r == *g && *r == *b) {
*w = *r;
*r = 0;
*g = 0;
*b = 0;
}
}
void _pixelbuf_set_pixel_color(pixelbuf_pixelbuf_obj_t* self, size_t index, uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
// DotStars don't have white, instead they have 5 bit brightness so pack it into w. Shift right
// by three to leave the top five bits.
if (self->bytes_per_pixel == 4 && self->byteorder.is_dotstar) {
w = DOTSTAR_LED_START | w >> 3;
}
pixelbuf_rgbw_t *rgbw_order = &self->byteorder.byteorder;
size_t offset = index * self->bytes_per_pixel;
if (self->pre_brightness_buffer != NULL) {
uint8_t* pre_brightness_buffer = self->pre_brightness_buffer + offset;
if (self->bytes_per_pixel == 4) {
pre_brightness_buffer[rgbw_order->w] = w;
}
pre_brightness_buffer[rgbw_order->r] = r;
pre_brightness_buffer[rgbw_order->g] = g;
pre_brightness_buffer[rgbw_order->b] = b;
}
uint8_t* post_brightness_buffer = self->post_brightness_buffer + offset;
if (self->bytes_per_pixel == 4) {
// Only apply brightness if w is actually white (aka not DotStar.)
if (!self->byteorder.is_dotstar) {
w *= self->brightness;
}
post_brightness_buffer[rgbw_order->w] = w;
}
post_brightness_buffer[rgbw_order->r] = r * self->brightness;
post_brightness_buffer[rgbw_order->g] = g * self->brightness;
post_brightness_buffer[rgbw_order->b] = b * self->brightness;
}
void _pixelbuf_set_pixel(pixelbuf_pixelbuf_obj_t* self, size_t index, mp_obj_t value) {
uint8_t r;
uint8_t g;
uint8_t b;
uint8_t w;
_pixelbuf_parse_color(self, value, &r, &g, &b, &w);
_pixelbuf_set_pixel_color(self, index, r, g, b, w);
}
void common_hal__pixelbuf_pixelbuf_set_pixels(mp_obj_t self_in, size_t start, mp_int_t step, size_t slice_len, mp_obj_t* values,
mp_obj_tuple_t *flatten_to)
{
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
mp_obj_iter_buf_t iter_buf;
mp_obj_t iterable = mp_getiter(values, &iter_buf);
mp_obj_t item;
size_t i = 0;
bool flattened = flatten_to != mp_const_none;
if (flattened) flatten_to->len = self->bytes_per_pixel;
while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
if (flattened) {
flatten_to->items[i % self->bytes_per_pixel] = item;
if (++i % self->bytes_per_pixel == 0) {
_pixelbuf_set_pixel(self, start, flatten_to);
start+=step;
}
} else {
_pixelbuf_set_pixel(self, start, item);
start+=step;
}
}
if (self->auto_write) {
common_hal__pixelbuf_pixelbuf_show(self_in);
}
}
void common_hal__pixelbuf_pixelbuf_set_pixel(mp_obj_t self_in, size_t index, mp_obj_t value) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
_pixelbuf_set_pixel(self, index, value);
if (self->auto_write) {
common_hal__pixelbuf_pixelbuf_show(self_in);
}
}
mp_obj_t common_hal__pixelbuf_pixelbuf_get_pixel(mp_obj_t self_in, size_t index) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
mp_obj_t elems[self->byteorder.bpp];
uint8_t* pixel_buffer = self->post_brightness_buffer;
if (self->pre_brightness_buffer != NULL) {
pixel_buffer = self->pre_brightness_buffer;
}
pixel_buffer += self->byteorder.bpp * index;
pixelbuf_rgbw_t *rgbw_order = &self->byteorder.byteorder;
elems[0] = MP_OBJ_NEW_SMALL_INT(pixel_buffer[rgbw_order->r]);
elems[1] = MP_OBJ_NEW_SMALL_INT(pixel_buffer[rgbw_order->g]);
elems[2] = MP_OBJ_NEW_SMALL_INT(pixel_buffer[rgbw_order->b]);
if (self->byteorder.bpp > 3) {
uint8_t w = pixel_buffer[rgbw_order->w];
if (self->byteorder.is_dotstar) {
elems[3] = mp_obj_new_float((w & 0b00011111) / 31.0);
} else {
elems[3] = MP_OBJ_NEW_SMALL_INT(w);
}
}
return mp_obj_new_tuple(self->byteorder.bpp, elems);
}
void common_hal__pixelbuf_pixelbuf_show(mp_obj_t self_in) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
mp_obj_t dest[2 + 1];
mp_load_method(self_in, MP_QSTR__transmit, dest);
dest[2] = self->transmit_buffer_obj;
mp_call_method_n_kw(1, 0, dest);
}
void common_hal__pixelbuf_pixelbuf_fill(mp_obj_t self_in, mp_obj_t fill_color) {
pixelbuf_pixelbuf_obj_t* self = native_pixelbuf(self_in);
uint8_t r;
uint8_t g;
uint8_t b;
uint8_t w;
_pixelbuf_parse_color(self, fill_color, &r, &g, &b, &w);
for (size_t i = 0; i < self->pixel_count; i++) {
_pixelbuf_set_pixel_color(self, i, r, g, b, w);
}
if (self->auto_write) {
common_hal__pixelbuf_pixelbuf_show(self_in);
}
}
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