94 lines
3.6 KiB
C
94 lines
3.6 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 <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[24];
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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, 48, &bytes_read) != FR_OK) {
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mp_raise_OSError(MP_EIO);
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}
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if (bytes_read != 48 ||
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memcmp(bmp_header, "BM", 2) != 0) {
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mp_raise_ValueError(translate("Invalid BMP 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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uint32_t compression = read_word(bmp_header, 15);
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if (!(header_size == 12 || header_size == 40 || header_size == 108 || header_size == 124) ||
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!(compression == 0)) {
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mp_raise_ValueError_varg(translate("Only Windows format, uncompressed BMP supported %d"), header_size);
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}
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// TODO(tannewt): Support bitfield compressed colors since RGB565 can be produced by the GIMP.
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uint16_t bits_per_pixel = bmp_header[14];
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if (bits_per_pixel < 24) {
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mp_raise_ValueError_varg(translate("Only true color (24 bpp or higher) BMP supported %x"), bits_per_pixel);
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}
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self->bytes_per_pixel = bits_per_pixel / 8;
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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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uint32_t byte_width = self->width * self->bytes_per_pixel;
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self->stride = byte_width;
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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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}
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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 = self->data_offset + (self->height - y) * self->stride + x * self->bytes_per_pixel;
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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 = 0;
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uint32_t result = f_read(&self->file->fp, &pixel, self->bytes_per_pixel, &bytes_read);
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if (result == FR_OK) {
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return pixel;
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}
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return 0;
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}
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