208 lines
8.1 KiB
C
208 lines
8.1 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/OnDiskBitmap.h"
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#include "shared-bindings/displayio/ColorConverter.h"
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#include "shared-bindings/displayio/Palette.h"
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#include "shared-module/displayio/ColorConverter.h"
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#include "shared-module/displayio/Palette.h"
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#include <string.h>
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#include "py/mperrno.h"
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#include "py/runtime.h"
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static uint32_t read_word(uint16_t *bmp_header, uint16_t index) {
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return bmp_header[index] | bmp_header[index + 1] << 16;
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}
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void common_hal_displayio_ondiskbitmap_construct(displayio_ondiskbitmap_t *self, pyb_file_obj_t *file) {
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// Load the wave
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self->file = file;
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uint16_t bmp_header[69];
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f_rewind(&self->file->fp);
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UINT bytes_read;
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if (f_read(&self->file->fp, bmp_header, 138, &bytes_read) != FR_OK) {
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mp_raise_OSError(MP_EIO);
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}
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if (bytes_read != 138 ||
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memcmp(bmp_header, "BM", 2) != 0) {
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mp_arg_error_invalid(MP_QSTR_file);
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}
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// We can't cast because we're not aligned.
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self->data_offset = read_word(bmp_header, 5);
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uint32_t header_size = read_word(bmp_header, 7);
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uint16_t bits_per_pixel = bmp_header[14];
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uint32_t compression = read_word(bmp_header, 15);
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uint32_t number_of_colors = read_word(bmp_header, 23);
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bool indexed = bits_per_pixel <= 8;
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self->bitfield_compressed = (compression == 3);
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self->bits_per_pixel = bits_per_pixel;
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self->width = read_word(bmp_header, 9);
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self->height = read_word(bmp_header, 11);
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displayio_colorconverter_t *colorconverter =
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mp_obj_malloc(displayio_colorconverter_t, &displayio_colorconverter_type);
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common_hal_displayio_colorconverter_construct(colorconverter, false, DISPLAYIO_COLORSPACE_RGB888);
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self->colorconverter = colorconverter;
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if (bits_per_pixel == 16) {
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if (((header_size >= 56)) || (self->bitfield_compressed)) {
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self->r_bitmask = read_word(bmp_header, 27);
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self->g_bitmask = read_word(bmp_header, 29);
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self->b_bitmask = read_word(bmp_header, 31);
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} else { // no compression or short header means 5:5:5
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self->r_bitmask = 0x7c00;
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self->g_bitmask = 0x3e0;
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self->b_bitmask = 0x1f;
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}
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} else if (indexed) {
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if (number_of_colors == 0) {
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number_of_colors = 1 << bits_per_pixel;
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}
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displayio_palette_t *palette = mp_obj_malloc(displayio_palette_t, &displayio_palette_type);
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common_hal_displayio_palette_construct(palette, number_of_colors, false);
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if (number_of_colors > 1) {
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uint16_t palette_size = number_of_colors * sizeof(uint32_t);
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uint16_t palette_offset = 0xe + header_size;
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uint32_t *palette_data = m_malloc(palette_size);
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f_rewind(&self->file->fp);
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f_lseek(&self->file->fp, palette_offset);
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UINT palette_bytes_read;
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if (f_read(&self->file->fp, palette_data, palette_size, &palette_bytes_read) != FR_OK) {
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mp_raise_OSError(MP_EIO);
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}
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if (palette_bytes_read != palette_size) {
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mp_raise_ValueError(MP_ERROR_TEXT("Unable to read color palette data"));
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}
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for (uint16_t i = 0; i < number_of_colors; i++) {
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common_hal_displayio_palette_set_color(palette, i, palette_data[i]);
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}
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m_free(palette_data);
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} else {
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common_hal_displayio_palette_set_color(palette, 0, 0x0);
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common_hal_displayio_palette_set_color(palette, 1, 0xffffff);
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}
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self->palette = palette;
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} else if (!(header_size == 12 || header_size == 40 || header_size == 108 || header_size == 124)) {
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mp_raise_ValueError_varg(MP_ERROR_TEXT("Only Windows format, uncompressed BMP supported: given header size is %d"), header_size);
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}
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if (bits_per_pixel == 8 && number_of_colors == 0) {
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mp_raise_ValueError_varg(MP_ERROR_TEXT("Only monochrome, indexed 4bpp or 8bpp, and 16bpp or greater BMPs supported: %d bpp given"), bits_per_pixel);
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}
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uint8_t bytes_per_pixel = (self->bits_per_pixel / 8) ? (self->bits_per_pixel / 8) : 1;
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uint8_t pixels_per_byte = 8 / self->bits_per_pixel;
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if (pixels_per_byte == 0) {
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self->stride = (self->width * bytes_per_pixel);
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// Rows are word aligned.
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if (self->stride % 4 != 0) {
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self->stride += 4 - self->stride % 4;
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}
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} else {
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uint32_t bit_stride = self->width * self->bits_per_pixel;
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if (bit_stride % 32 != 0) {
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bit_stride += 32 - bit_stride % 32;
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}
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self->stride = (bit_stride / 8);
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}
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}
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uint32_t common_hal_displayio_ondiskbitmap_get_pixel(displayio_ondiskbitmap_t *self,
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int16_t x, int16_t y) {
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if (x < 0 || x >= self->width || y < 0 || y >= self->height) {
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return 0;
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}
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uint32_t location;
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uint8_t bytes_per_pixel = (self->bits_per_pixel / 8) ? (self->bits_per_pixel / 8) : 1;
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uint8_t pixels_per_byte = 8 / self->bits_per_pixel;
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if (pixels_per_byte == 0) {
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location = self->data_offset + (self->height - y - 1) * self->stride + x * bytes_per_pixel;
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} else {
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location = self->data_offset + (self->height - y - 1) * self->stride + x / pixels_per_byte;
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}
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// We don't cache here because the underlying FS caches sectors.
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f_lseek(&self->file->fp, location);
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UINT bytes_read;
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uint32_t pixel_data = 0;
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uint32_t result = f_read(&self->file->fp, &pixel_data, bytes_per_pixel, &bytes_read);
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if (result == FR_OK) {
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uint32_t tmp = 0;
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uint8_t red;
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uint8_t green;
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uint8_t blue;
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if (bytes_per_pixel == 1) {
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uint8_t offset = (x % pixels_per_byte) * self->bits_per_pixel;
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uint8_t mask = (1 << self->bits_per_pixel) - 1;
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return (pixel_data >> ((8 - self->bits_per_pixel) - offset)) & mask;
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} else if (bytes_per_pixel == 2) {
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if (self->g_bitmask == 0x07e0) { // 565
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red = ((pixel_data & self->r_bitmask) >> 11);
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green = ((pixel_data & self->g_bitmask) >> 5);
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blue = ((pixel_data & self->b_bitmask) >> 0);
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} else { // 555
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red = ((pixel_data & self->r_bitmask) >> 10);
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green = ((pixel_data & self->g_bitmask) >> 4);
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blue = ((pixel_data & self->b_bitmask) >> 0);
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}
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tmp = (red << 19 | green << 10 | blue << 3);
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return tmp;
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} else if ((bytes_per_pixel == 4) && (self->bitfield_compressed)) {
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return pixel_data & 0x00FFFFFF;
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} else {
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return pixel_data;
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}
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}
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return 0;
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}
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uint16_t common_hal_displayio_ondiskbitmap_get_height(displayio_ondiskbitmap_t *self) {
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return self->height;
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}
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uint16_t common_hal_displayio_ondiskbitmap_get_width(displayio_ondiskbitmap_t *self) {
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return self->width;
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}
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mp_obj_t common_hal_displayio_ondiskbitmap_get_pixel_shader(displayio_ondiskbitmap_t *self) {
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return MP_OBJ_FROM_PTR(self->pixel_shader_base);
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}
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