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/*
* 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 <string.h>
#include "py/runtime.h"
void common_hal_displayio_bitmap_construct(displayio_bitmap_t *self, uint32_t width,
uint32_t height, uint32_t bits_per_value) {
uint32_t row_width = width * bits_per_value;
// align to size_t
uint8_t align_bits = 8 * sizeof(size_t);
if (row_width % align_bits != 0) {
self->stride = (row_width / align_bits + 1);
} else {
self->stride = row_width / align_bits;
}
self->width = width;
self->height = height;
self->data = m_malloc(self->stride * height * sizeof(size_t), false);
self->read_only = false;
self->bits_per_value = bits_per_value;
if (bits_per_value > 8 && bits_per_value != 16 && bits_per_value != 32) {
mp_raise_NotImplementedError(translate("Invalid bits per value"));
}
// Division and modulus can be slow because it has to handle any integer. We know bits_per_value
// is a power of two. We divide and mod by bits_per_value to compute the offset into the byte
// array. So, we can the offset computation to simplify to a shift for division and mask for mod.
self->x_shift = 0; // Used to divide the index by the number of pixels per word. Its used in a
// shift which effectively divides by 2 ** x_shift.
uint32_t power_of_two = 1;
while (power_of_two < align_bits / bits_per_value ) {
self->x_shift++;
power_of_two <<= 1;
}
self->x_mask = (1 << self->x_shift) - 1; // Used as a modulus on the x value
self->bitmask = (1 << bits_per_value) - 1;
}
uint16_t common_hal_displayio_bitmap_get_height(displayio_bitmap_t *self) {
return self->height;
}
uint16_t common_hal_displayio_bitmap_get_width(displayio_bitmap_t *self) {
return self->width;
}
uint32_t common_hal_displayio_bitmap_get_bits_per_value(displayio_bitmap_t *self) {
return self->bits_per_value;
}
uint32_t common_hal_displayio_bitmap_get_pixel(displayio_bitmap_t *self, int16_t x, int16_t y) {
if (x >= self->width || x < 0 || y >= self->height || y < 0) {
return 0;
}
int32_t row_start = y * self->stride;
uint32_t bytes_per_value = self->bits_per_value / 8;
if (bytes_per_value < 1) {
size_t word = self->data[row_start + (x >> self->x_shift)];
return (word >> (sizeof(size_t) * 8 - ((x & self->x_mask) + 1) * self->bits_per_value)) & self->bitmask;
} else {
size_t* row = self->data + row_start;
if (bytes_per_value == 1) {
return ((uint8_t*) row)[x];
} else if (bytes_per_value == 2) {
return ((uint16_t*) row)[x];
} else if (bytes_per_value == 4) {
return ((uint32_t*) row)[x];
}
}
return 0;
}
void common_hal_displayio_bitmap_set_pixel(displayio_bitmap_t *self, int16_t x, int16_t y, uint32_t value) {
if (self->read_only) {
mp_raise_RuntimeError(translate("Read-only object"));
}
int32_t row_start = y * self->stride;
uint32_t bytes_per_value = self->bits_per_value / 8;
if (bytes_per_value < 1) {
uint32_t bit_position = (sizeof(size_t) * 8 - ((x & self->x_mask) + 1) * self->bits_per_value);
uint32_t index = row_start + (x >> self->x_shift);
uint32_t word = self->data[index];
word &= ~(self->bitmask << bit_position);
word |= (value & self->bitmask) << bit_position;
self->data[index] = word;
} else {
size_t* row = self->data + row_start;
if (bytes_per_value == 1) {
((uint8_t*) row)[x] = value;
} else if (bytes_per_value == 2) {
((uint16_t*) row)[x] = value;
} else if (bytes_per_value == 4) {
((uint32_t*) row)[x] = value;
}
}
}
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