f224ed1848
Microsoft documentation says: > If biCompression equals BI_RGB and the bitmap uses 8 bpp or less, the bitmap has a color table immediatelly following the BITMAPINFOHEADER structure. The color table consists of an array of RGBQUAD values. The size of the array is given by the biClrUsed member. If biClrUsed is zero, the array contains the maximum number of colors for the given bitdepth; that is, 2^biBitCount colors. Formerly, we treated 0 colors as "no image palette" during construction, but then during common_hal_displayio_ondiskbitmap_get_pixel indexed into the palette anyway. This could have unpredictable results. On a pygamer, it gave an image that was blue and black. On magtag, it gave a crash.
188 lines
7.1 KiB
C
188 lines
7.1 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 <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_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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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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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 && self->bits_per_pixel != 1) {
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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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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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self->palette_data = m_malloc(palette_size, false);
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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, self->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(translate("Unable to read color palette data"));
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}
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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(translate("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(translate("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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uint8_t index = (pixel_data >> ((8 - self->bits_per_pixel) - offset)) & mask;
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if (self->bits_per_pixel == 1) {
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if (index == 1) {
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return 0xFFFFFF;
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} else {
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return 0x000000;
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}
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}
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return self->palette_data[index];
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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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