circuitpython/shared-module/displayio/OnDiskBitmap.c

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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/OnDiskBitmap.h"
#include <string.h>
#include "py/mperrno.h"
#include "py/runtime.h"
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static uint32_t read_word(uint16_t *bmp_header, uint16_t index) {
return bmp_header[index] | bmp_header[index + 1] << 16;
}
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void common_hal_displayio_ondiskbitmap_construct(displayio_ondiskbitmap_t *self, pyb_file_obj_t *file) {
// Load the wave
self->file = file;
uint16_t bmp_header[69];
f_rewind(&self->file->fp);
UINT bytes_read;
if (f_read(&self->file->fp, bmp_header, 138, &bytes_read) != FR_OK) {
mp_raise_OSError(MP_EIO);
}
if (bytes_read != 138 ||
memcmp(bmp_header, "BM", 2) != 0) {
mp_raise_ValueError(translate("Invalid BMP file"));
}
// We can't cast because we're not aligned.
self->data_offset = read_word(bmp_header, 5);
uint32_t header_size = read_word(bmp_header, 7);
uint16_t bits_per_pixel = bmp_header[14];
uint32_t compression = read_word(bmp_header, 15);
uint32_t number_of_colors = read_word(bmp_header, 23);
bool indexed = bits_per_pixel <= 8;
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self->bitfield_compressed = (compression == 3);
self->bits_per_pixel = bits_per_pixel;
self->width = read_word(bmp_header, 9);
self->height = read_word(bmp_header, 11);
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if (bits_per_pixel == 16) {
if (((header_size >= 56)) || (self->bitfield_compressed)) {
self->r_bitmask = read_word(bmp_header, 27);
self->g_bitmask = read_word(bmp_header, 29);
self->b_bitmask = read_word(bmp_header, 31);
} else { // no compression or short header means 5:5:5
self->r_bitmask = 0x7c00;
self->g_bitmask = 0x3e0;
self->b_bitmask = 0x1f;
}
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} else if (indexed && self->bits_per_pixel != 1) {
if (number_of_colors == 0) {
number_of_colors = 1 << bits_per_pixel;
}
uint16_t palette_size = number_of_colors * sizeof(uint32_t);
uint16_t palette_offset = 0xe + header_size;
self->palette_data = m_malloc(palette_size, false);
f_rewind(&self->file->fp);
f_lseek(&self->file->fp, palette_offset);
UINT palette_bytes_read;
if (f_read(&self->file->fp, self->palette_data, palette_size, &palette_bytes_read) != FR_OK) {
mp_raise_OSError(MP_EIO);
}
if (palette_bytes_read != palette_size) {
mp_raise_ValueError(translate("Unable to read color palette data"));
}
} else if (!(header_size == 12 || header_size == 40 || header_size == 108 || header_size == 124)) {
mp_raise_ValueError_varg(translate("Only Windows format, uncompressed BMP supported: given header size is %d"), header_size);
}
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if (bits_per_pixel == 8 && number_of_colors == 0) {
mp_raise_ValueError_varg(translate("Only monochrome, indexed 4bpp or 8bpp, and 16bpp or greater BMPs supported: %d bpp given"), bits_per_pixel);
}
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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);
// Rows are word aligned.
if (self->stride % 4 != 0) {
self->stride += 4 - self->stride % 4;
}
} else {
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uint32_t bit_stride = self->width * self->bits_per_pixel;
if (bit_stride % 32 != 0) {
bit_stride += 32 - bit_stride % 32;
}
self->stride = (bit_stride / 8);
}
}
uint32_t common_hal_displayio_ondiskbitmap_get_pixel(displayio_ondiskbitmap_t *self,
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int16_t x, int16_t y) {
if (x < 0 || x >= self->width || y < 0 || y >= self->height) {
return 0;
}
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) {
location = self->data_offset + (self->height - y - 1) * self->stride + x * bytes_per_pixel;
} else {
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location = self->data_offset + (self->height - y - 1) * self->stride + x / pixels_per_byte;
}
// We don't cache here because the underlying FS caches sectors.
f_lseek(&self->file->fp, location);
UINT bytes_read;
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uint32_t pixel_data = 0;
uint32_t result = f_read(&self->file->fp, &pixel_data, bytes_per_pixel, &bytes_read);
if (result == FR_OK) {
uint32_t tmp = 0;
uint8_t red;
uint8_t green;
uint8_t blue;
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if (bytes_per_pixel == 1) {
uint8_t offset = (x % pixels_per_byte) * self->bits_per_pixel;
uint8_t mask = (1 << self->bits_per_pixel) - 1;
uint8_t index = (pixel_data >> ((8 - self->bits_per_pixel) - offset)) & mask;
if (self->bits_per_pixel == 1) {
if (index == 1) {
return 0xFFFFFF;
} else {
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return 0x000000;
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}
}
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return self->palette_data[index];
} else if (bytes_per_pixel == 2) {
if (self->g_bitmask == 0x07e0) { // 565
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red = ((pixel_data & self->r_bitmask) >> 11);
green = ((pixel_data & self->g_bitmask) >> 5);
blue = ((pixel_data & self->b_bitmask) >> 0);
} else { // 555
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red = ((pixel_data & self->r_bitmask) >> 10);
green = ((pixel_data & self->g_bitmask) >> 4);
blue = ((pixel_data & self->b_bitmask) >> 0);
}
tmp = (red << 19 | green << 10 | blue << 3);
return tmp;
} else if ((bytes_per_pixel == 4) && (self->bitfield_compressed)) {
return pixel_data & 0x00FFFFFF;
} else {
return pixel_data;
}
}
return 0;
}
uint16_t common_hal_displayio_ondiskbitmap_get_height(displayio_ondiskbitmap_t *self) {
return self->height;
}
uint16_t common_hal_displayio_ondiskbitmap_get_width(displayio_ondiskbitmap_t *self) {
return self->width;
}