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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"
static uint32_t read_word(uint16_t* bmp_header, uint16_t index) {
return bmp_header[index] | bmp_header[index + 1] << 16;
}
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[24];
f_rewind(&self->file->fp);
UINT bytes_read;
if (f_read(&self->file->fp, bmp_header, 48, &bytes_read) != FR_OK) {
mp_raise_OSError(MP_EIO);
}
if (bytes_read != 48 ||
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);
uint32_t compression = read_word(bmp_header, 15);
if (!(header_size == 12 || header_size == 40 || header_size == 108 || header_size == 124) ||
!(compression == 0)) {
mp_raise_ValueError_varg(translate("Only Windows format, uncompressed BMP supported %d"), header_size);
}
// TODO(tannewt): Support bitfield compressed colors since RGB565 can be produced by the GIMP.
uint16_t bits_per_pixel = bmp_header[14];
if (bits_per_pixel < 24) {
mp_raise_ValueError_varg(translate("Only true color (24 bpp or higher) BMP supported %x"), bits_per_pixel);
}
self->bytes_per_pixel = bits_per_pixel / 8;
self->width = read_word(bmp_header, 9);
self->height = read_word(bmp_header, 11);
uint32_t byte_width = self->width * self->bytes_per_pixel;
self->stride = byte_width;
// Rows are word aligned.
if (self->stride % 4 != 0) {
self->stride += 4 - self->stride % 4;
}
}
uint32_t common_hal_displayio_ondiskbitmap_get_pixel(displayio_ondiskbitmap_t *self,
int16_t x, int16_t y) {
if (x < 0 || x >= self->width || y < 0 || y >= self->height) {
return 0;
}
uint32_t location = self->data_offset + (self->height - y) * self->stride + x * self->bytes_per_pixel;
// We don't cache here because the underlying FS caches sectors.
f_lseek(&self->file->fp, location);
UINT bytes_read;
uint32_t pixel = 0;
uint32_t result = f_read(&self->file->fp, &pixel, self->bytes_per_pixel, &bytes_read);
if (result == FR_OK) {
return pixel;
}
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;
}
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