160 lines
3.5 KiB
C++
160 lines
3.5 KiB
C++
/*
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* Copyright (C) OpenTX
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*
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* Based on code named
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* th9x - http://code.google.com/p/th9x
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* er9x - http://code.google.com/p/er9x
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* gruvin9x - http://code.google.com/p/gruvin9x
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*
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* License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "opentx.h"
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uint8_t * lcdLoadBitmap(uint8_t * bmp, const char * filename, uint8_t width, uint8_t height)
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{
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FIL bmpFile;
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UINT read;
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uint8_t bmpBuf[LCD_W]; /* maximum with LCD_W */
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uint8_t * buf = &bmpBuf[0];
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if (width > LCD_W) {
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return NULL;
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}
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FRESULT result = f_open(&bmpFile, filename, FA_OPEN_EXISTING | FA_READ);
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if (result != FR_OK) {
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return NULL;
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}
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if (f_size(&bmpFile) < 14) {
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f_close(&bmpFile);
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return NULL;
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}
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result = f_read(&bmpFile, buf, 14, &read);
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if (result != FR_OK || read != 14) {
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f_close(&bmpFile);
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return NULL;
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}
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if (buf[0] != 'B' || buf[1] != 'M') {
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f_close(&bmpFile);
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return NULL;
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}
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uint32_t fsize = *((uint32_t *)&buf[2]);
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uint32_t hsize = *((uint32_t *)&buf[10]); /* header size */
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uint32_t len = limit((uint32_t)4, (uint32_t)(hsize-14), (uint32_t)32);
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result = f_read(&bmpFile, buf, len, &read);
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if (result != FR_OK || read != len) {
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f_close(&bmpFile);
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return NULL;
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}
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uint32_t ihsize = *((uint32_t *)&buf[0]); /* more header size */
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/* invalid header size */
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if (ihsize + 14 > hsize) {
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f_close(&bmpFile);
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return NULL;
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}
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/* sometimes file size is set to some headers size, set a real size in that case */
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if (fsize == 14 || fsize == ihsize + 14) {
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fsize = f_size(&bmpFile) - 2;
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}
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/* declared file size less than header size */
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if (fsize <= hsize) {
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f_close(&bmpFile);
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return NULL;
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}
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uint32_t w, h;
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switch (ihsize){
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case 40: // windib
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case 56: // windib v3
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case 64: // OS/2 v2
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case 108: // windib v4
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case 124: // windib v5
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w = *((uint32_t *)&buf[4]);
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h = *((uint32_t *)&buf[8]);
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buf += 12;
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break;
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case 12: // OS/2 v1
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w = *((uint16_t *)&buf[4]);
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h = *((uint16_t *)&buf[6]);
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buf += 8;
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break;
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default:
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f_close(&bmpFile);
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return NULL;
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}
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if (*((uint16_t *)&buf[0]) != 1) { /* planes */
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f_close(&bmpFile);
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return NULL;
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}
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if (w > width || h > height) {
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f_close(&bmpFile);
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return NULL;
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}
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uint16_t depth = *((uint16_t *)&buf[2]);
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buf = &bmpBuf[0];
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if (f_lseek(&bmpFile, hsize) != FR_OK) {
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f_close(&bmpFile);
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return NULL;
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}
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uint8_t * dest = bmp;
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*dest++ = w;
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*dest++ = h;
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memset(dest, 0, BITMAP_BUFFER_SIZE(w, h) - 2);
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uint8_t rowSize = (w + 7) / 8;
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switch (depth) {
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case 1:
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for (int8_t i=h-1; i>=0; i--) {
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result = f_read(&bmpFile, buf, rowSize, &read);
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if (result != FR_OK || read != rowSize) {
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f_close(&bmpFile);
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return NULL;
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}
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for (uint8_t j=0; j<w; j++) {
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if (!(buf[j/8] & (1<<(7-(j%8))))) {
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uint8_t *dst = dest + i / 8 * w + j;
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*dst |= (0x01 << (i & 0x07));
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}
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}
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}
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break;
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default:
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f_close(&bmpFile);
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return NULL;
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}
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f_close(&bmpFile);
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return bmp;
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}
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