102 lines
4.1 KiB
C
102 lines
4.1 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "shared-bindings/displayio/Bitmap.h"
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#include <string.h>
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#include "py/runtime.h"
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void common_hal_displayio_bitmap_construct(displayio_bitmap_t *self, uint32_t width,
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uint32_t height, uint32_t bits_per_value) {
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uint32_t row_width = width * bits_per_value;
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// word align
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if (row_width % 32 != 0) {
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self->stride = (row_width / 32 + 1);
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} else {
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self->stride = row_width / 32;
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}
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self->width = width;
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self->height = height;
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self->data = m_malloc(self->stride * height * sizeof(uint32_t), false);
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self->bits_per_value = bits_per_value;
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if (bits_per_value > 8) {
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mp_raise_NotImplementedError(translate("Only bit maps of 8 bit color or less are supported"));
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}
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// Division and modulus can be slow because it has to handle any integer. We know bits_per_value
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// is a power of two. We divide and mod by bits_per_value to compute the offset into the byte
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// array. So, we can the offset computation to simplify to a shift for division and mask for mod.
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self->x_shift = 0; // Used to divide the index by the number of pixels per word. Its used in a
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// shift which effectively divides by 2 ** x_shift.
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uint32_t power_of_two = 1;
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while (power_of_two < 32 / bits_per_value ) {
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self->x_shift++;
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power_of_two <<= 1;
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}
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self->x_mask = (1 << self->x_shift) - 1; // Used as a modulus on the x value
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self->bitmask = (1 << bits_per_value) - 1;
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}
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void common_hal_displayio_bitmap_load_row(displayio_bitmap_t *self, uint16_t y, uint8_t* data, uint16_t len) {
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if (len != self->stride * sizeof(uint32_t)) {
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mp_raise_ValueError(translate("row must be packed and word aligned"));
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}
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uint32_t* row_value = self->data + (y * self->stride);
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// Do the memcpy ourselves since we may want to flip endianness.
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for (uint32_t i = 0; i < self->stride; i++) {
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-align"
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uint32_t value = ((uint32_t *)data)[i];
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#pragma GCC diagnostic pop
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if (self->bits_per_value < 16) {
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value = ((value >> 24) & 0xff) |
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((value << 8) & 0xff0000) |
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((value >> 8) & 0xff00) |
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((value << 24) & 0xff000000);
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}
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*row_value = value;
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row_value++;
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}
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}
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uint32_t common_hal_displayio_bitmap_get_pixel(displayio_bitmap_t *self, int16_t x, int16_t y) {
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if (x >= self->width || x < 0 || y >= self->height || y < 0) {
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return 0;
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}
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int32_t row_start = y * self->stride;
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if (self->bits_per_value < 8) {
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uint32_t word = self->data[row_start + (x >> self->x_shift)];
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return (word >> (32 - ((x & self->x_mask) + 1) * self->bits_per_value)) & self->bitmask;
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} else {
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uint32_t bytes_per_value = self->bits_per_value / 8;
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return self->data[row_start + x * bytes_per_value];
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}
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}
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