267 lines
9.9 KiB
C
267 lines
9.9 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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enum { ALIGN_BITS = 8 * sizeof(uint32_t) };
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static int stride(uint32_t width, uint32_t bits_per_value) {
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uint32_t row_width = width * bits_per_value;
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// align to uint32_t
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return (row_width + ALIGN_BITS - 1) / ALIGN_BITS;
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}
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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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common_hal_displayio_bitmap_construct_from_buffer(self, width, height, bits_per_value, NULL, false);
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}
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void common_hal_displayio_bitmap_construct_from_buffer(displayio_bitmap_t *self, uint32_t width,
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uint32_t height, uint32_t bits_per_value, uint32_t *data, bool read_only) {
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self->width = width;
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self->height = height;
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self->stride = stride(width, bits_per_value);
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if (!data) {
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data = m_malloc(self->stride * height * sizeof(uint32_t), false);
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}
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self->data = data;
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self->read_only = read_only;
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self->bits_per_value = bits_per_value;
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if (bits_per_value > 8 && bits_per_value != 16 && bits_per_value != 32) {
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mp_raise_NotImplementedError(translate("Invalid bits per value"));
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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 < ALIGN_BITS / 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 = (1u << self->x_shift) - 1u; // Used as a modulus on the x value
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self->bitmask = (1u << bits_per_value) - 1u;
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self->dirty_area.x1 = 0;
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self->dirty_area.x2 = width;
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self->dirty_area.y1 = 0;
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self->dirty_area.y2 = height;
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}
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uint16_t common_hal_displayio_bitmap_get_height(displayio_bitmap_t *self) {
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return self->height;
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}
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uint16_t common_hal_displayio_bitmap_get_width(displayio_bitmap_t *self) {
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return self->width;
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}
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uint32_t common_hal_displayio_bitmap_get_bits_per_value(displayio_bitmap_t *self) {
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return self->bits_per_value;
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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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uint32_t bytes_per_value = self->bits_per_value / 8;
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if (bytes_per_value < 1) {
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uint32_t word = self->data[row_start + (x >> self->x_shift)];
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return (word >> (sizeof(uint32_t) * 8 - ((x & self->x_mask) + 1) * self->bits_per_value)) & self->bitmask;
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} else {
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uint32_t *row = self->data + row_start;
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if (bytes_per_value == 1) {
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return ((uint8_t *)row)[x];
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} else if (bytes_per_value == 2) {
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return ((uint16_t *)row)[x];
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} else if (bytes_per_value == 4) {
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return ((uint32_t *)row)[x];
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}
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}
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return 0;
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}
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void displayio_bitmap_set_dirty_area(displayio_bitmap_t *self, const displayio_area_t *dirty_area) {
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if (self->read_only) {
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mp_raise_RuntimeError(translate("Read-only"));
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}
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displayio_area_t area = *dirty_area;
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displayio_area_canon(&area);
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displayio_area_union(&area, &self->dirty_area, &area);
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displayio_area_t bitmap_area = {0, 0, self->width, self->height, NULL};
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displayio_area_compute_overlap(&area, &bitmap_area, &self->dirty_area);
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}
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void displayio_bitmap_write_pixel(displayio_bitmap_t *self, int16_t x, int16_t y, uint32_t value) {
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// Writes the color index value into a pixel position
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// Must update the dirty area separately
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// Update one pixel of data
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int32_t row_start = y * self->stride;
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uint32_t bytes_per_value = self->bits_per_value / 8;
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if (bytes_per_value < 1) {
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uint32_t bit_position = (sizeof(uint32_t) * 8 - ((x & self->x_mask) + 1) * self->bits_per_value);
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uint32_t index = row_start + (x >> self->x_shift);
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uint32_t word = self->data[index];
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word &= ~(self->bitmask << bit_position);
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word |= (value & self->bitmask) << bit_position;
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self->data[index] = word;
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} else {
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uint32_t *row = self->data + row_start;
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if (bytes_per_value == 1) {
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((uint8_t *)row)[x] = value;
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} else if (bytes_per_value == 2) {
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((uint16_t *)row)[x] = value;
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} else if (bytes_per_value == 4) {
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((uint32_t *)row)[x] = value;
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}
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}
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}
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void common_hal_displayio_bitmap_blit(displayio_bitmap_t *self, int16_t x, int16_t y, displayio_bitmap_t *source,
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int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint32_t skip_index, bool skip_index_none) {
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// Copy region of "source" bitmap into "self" bitmap at location x,y in the "self"
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// If skip_value is encountered in the source bitmap, it will not be copied.
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// If skip_value is `None`, then all pixels are copied.
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// This function assumes input checks were performed for pixel index entries.
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// Update the dirty area
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int16_t dirty_x_max = (x + (x2 - x1));
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if (dirty_x_max > self->width) {
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dirty_x_max = self->width;
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}
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int16_t dirty_y_max = y + (y2 - y1);
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if (dirty_y_max > self->height) {
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dirty_y_max = self->height;
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}
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displayio_area_t a = { x, y, dirty_x_max, dirty_y_max, NULL};
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displayio_bitmap_set_dirty_area(self, &a);
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bool x_reverse = false;
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bool y_reverse = false;
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// Add reverse direction option to protect blitting of self bitmap back into self bitmap
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if (x > x1) {
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x_reverse = true;
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}
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if (y > y1) {
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y_reverse = true;
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}
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// simplest version - use internal functions for get/set pixels
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for (int16_t i = 0; i < (x2 - x1); i++) {
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const int xs_index = x_reverse ? ((x2) - i - 1) : x1 + i; // x-index into the source bitmap
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const int xd_index = x_reverse ? ((x + (x2 - x1)) - i - 1) : x + i; // x-index into the destination bitmap
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if ((xd_index >= 0) && (xd_index < self->width)) {
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for (int16_t j = 0; j < (y2 - y1); j++) {
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const int ys_index = y_reverse ? ((y2) - j - 1) : y1 + j; // y-index into the source bitmap
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const int yd_index = y_reverse ? ((y + (y2 - y1)) - j - 1) : y + j; // y-index into the destination bitmap
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if ((yd_index >= 0) && (yd_index < self->height)) {
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uint32_t value = common_hal_displayio_bitmap_get_pixel(source, xs_index, ys_index);
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if ((skip_index_none) || (value != skip_index)) { // write if skip_value_none is True
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displayio_bitmap_write_pixel(self, xd_index, yd_index, value);
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}
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}
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}
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}
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}
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}
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void common_hal_displayio_bitmap_set_pixel(displayio_bitmap_t *self, int16_t x, int16_t y, uint32_t value) {
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// update the dirty region
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displayio_area_t a = {x, y, x + 1, y + 1, NULL};
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displayio_bitmap_set_dirty_area(self, &a);
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// write the pixel
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displayio_bitmap_write_pixel(self, x, y, value);
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}
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displayio_area_t *displayio_bitmap_get_refresh_areas(displayio_bitmap_t *self, displayio_area_t *tail) {
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if (self->dirty_area.x1 == self->dirty_area.x2) {
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return tail;
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}
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self->dirty_area.next = tail;
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return &self->dirty_area;
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}
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void displayio_bitmap_finish_refresh(displayio_bitmap_t *self) {
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self->dirty_area.x1 = 0;
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self->dirty_area.x2 = 0;
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}
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void common_hal_displayio_bitmap_fill(displayio_bitmap_t *self, uint32_t value) {
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displayio_area_t a = {0, 0, self->width, self->height, NULL};
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displayio_bitmap_set_dirty_area(self, &a);
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// build the packed word
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uint32_t word = 0;
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for (uint8_t i = 0; i < 32 / self->bits_per_value; i++) {
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word |= (value & self->bitmask) << (32 - ((i + 1) * self->bits_per_value));
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}
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// copy it in
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for (uint32_t i = 0; i < self->stride * self->height; i++) {
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self->data[i] = word;
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}
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}
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int common_hal_displayio_bitmap_get_buffer(displayio_bitmap_t *self, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
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if ((flags & MP_BUFFER_WRITE) && self->read_only) {
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return 1;
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}
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bufinfo->len = self->stride * self->height * sizeof(uint32_t);
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bufinfo->buf = self->data;
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switch (self->bits_per_value) {
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case 32:
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bufinfo->typecode = 'I';
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break;
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case 16:
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bufinfo->typecode = 'H';
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break;
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default:
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bufinfo->typecode = 'B';
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break;
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}
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return 0;
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}
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