213 lines
7.9 KiB
C
213 lines
7.9 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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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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// align to size_t
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uint8_t align_bits = 8 * sizeof(size_t);
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if (row_width % align_bits != 0) {
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self->stride = (row_width / align_bits + 1);
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} else {
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self->stride = row_width / align_bits;
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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(size_t), false);
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self->read_only = false;
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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 = (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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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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size_t word = self->data[row_start + (x >> self->x_shift)];
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return (word >> (sizeof(size_t) * 8 - ((x & self->x_mask) + 1) * self->bits_per_value)) & self->bitmask;
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} else {
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size_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 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 complete "source" bitmap into "self" bitmap at location x,y in the "self"
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// Add a boolean to determine if all values are copied, or only if non-zero
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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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if (self->read_only) {
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mp_raise_RuntimeError(translate("Read-only object"));
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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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if ( (x+i >= 0) && (x+i < self->width) ) {
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for (int16_t j=0; j < (y2-y1) ; j++){
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if ((y+j >= 0) && (y+j < self->height) ) {
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uint32_t value = common_hal_displayio_bitmap_get_pixel(source, x1+i, y1+j);
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if ( (skip_index_none) || (value != skip_index) ) { // write if skip_value_none is True
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common_hal_displayio_bitmap_set_pixel(self, x+i, y+j, 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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if (self->read_only) {
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mp_raise_RuntimeError(translate("Read-only object"));
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}
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// Update the dirty area.
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if (self->dirty_area.x1 == self->dirty_area.x2) {
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self->dirty_area.x1 = x;
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self->dirty_area.x2 = x + 1;
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self->dirty_area.y1 = y;
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self->dirty_area.y2 = y + 1;
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} else {
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if (x < self->dirty_area.x1) {
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self->dirty_area.x1 = x;
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} else if (x >= self->dirty_area.x2) {
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self->dirty_area.x2 = x + 1;
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}
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if (y < self->dirty_area.y1) {
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self->dirty_area.y1 = y;
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} else if (y >= self->dirty_area.y2) {
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self->dirty_area.y2 = y + 1;
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}
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}
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// Update our 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(size_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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size_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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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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if (self->read_only) {
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mp_raise_RuntimeError(translate("Read-only object"));
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}
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// Update the dirty area.
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self->dirty_area.x1 = 0;
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self->dirty_area.x2 = self->width;
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self->dirty_area.y1 = 0;
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self->dirty_area.y2 = self->height;
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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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