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bitmap_helpers.h
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#ifndef _BITMAP_HELPERS_H_
#define _BITMAP_HELPERS_H_
#include <stdio.h>
#include <string.h>
#include <string.h>
static void _r565_to_rgb(uint16_t color, uint8_t *r, uint8_t *g, uint8_t *b) {
*r = (color & 0xF800) >> 8;
*g = (color & 0x07E0) >> 3;
*b = (color & 0x1F) << 3;
}
// adapted from https://stackoverflow.com/a/2654860/107642
// used for debugging
int create_bitmap_file(const char *filename, uint16_t *buffer, size_t w, size_t h) {
int filesize = 54 + 3 * w * h;
uint8_t *img = (uint8_t*)calloc(3 * w * h, 1);
if (!img) {
return -1; /* OOM */
}
for (size_t i = 0; i < w; i++) {
for (size_t j = 0; j < h; j++) {
uint8_t r, g, b;
uint16_t color = buffer[(j * w) + i];
_r565_to_rgb(color, &r, &g, &b);
size_t x = i;
size_t y = (h - 1) - j;
img[(x+y*w)*3+2] = (unsigned char)(r);
img[(x+y*w)*3+1] = (unsigned char)(g);
img[(x+y*w)*3+0] = (unsigned char)(b);
}
}
uint8_t bmpfileheader[14] = { 'B','M', 0,0,0,0, 0,0, 0,0, 54,0,0,0 };
uint8_t bmpinfoheader[40] = { 40,0,0,0, 0,0,0,0, 0,0,0,0, 1,0, 24,0 };
uint8_t bmppad[3] = {0,0,0};
bmpfileheader[ 2] = (uint8_t)(filesize );
bmpfileheader[ 3] = (uint8_t)(filesize>> 8);
bmpfileheader[ 4] = (uint8_t)(filesize>>16);
bmpfileheader[ 5] = (uint8_t)(filesize>>24);
bmpinfoheader[ 4] = (uint8_t)( w );
bmpinfoheader[ 5] = (uint8_t)( w>> 8);
bmpinfoheader[ 6] = (uint8_t)( w>>16);
bmpinfoheader[ 7] = (uint8_t)( w>>24);
bmpinfoheader[ 8] = (uint8_t)( h );
bmpinfoheader[ 9] = (uint8_t)( h>> 8);
bmpinfoheader[10] = (uint8_t)( h>>16);
bmpinfoheader[11] = (uint8_t)( h>>24);
FILE *f = fopen(filename, "wb");
if (!f) {
free(img);
return -2; /* could not open file */
}
fwrite(bmpfileheader, 1, 14, f);
fwrite(bmpinfoheader, 1, 40, f);
for(int i = 0; i < h; i++) {
fwrite(img + (w * (h - i - 1) * 3), 3, w, f);
fwrite(bmppad, 1, (4 - (w * 3) % 4 ) % 4, f);
}
free(img);
fclose(f);
return 0;
}
// adapted from https://stackoverflow.com/a/2654860/107642
// used for debugging
int create_bitmap_file(uint8_t *out_buf, float *buffer, size_t w, size_t h) {
int filesize = 54 + 3 * w * h;
uint8_t *img = (uint8_t*)calloc(3 * w * h, 1);
if (!img) {
return -1; /* OOM */
}
for (size_t i = 0; i < w; i++) {
for (size_t j = 0; j < h; j++) {
float pixel_f = buffer[(j * w) + i];
uint32_t pixel = static_cast<uint32_t>(pixel_f);
uint8_t r = static_cast<uint8_t>(pixel >> 16 & 0xff);
uint8_t g = static_cast<uint8_t>(pixel >> 8 & 0xff);
uint8_t b = static_cast<uint8_t>(pixel & 0xff);
size_t x = i;
size_t y = (h - 1) - j;
img[(x+y*w)*3+2] = (unsigned char)(r);
img[(x+y*w)*3+1] = (unsigned char)(g);
img[(x+y*w)*3+0] = (unsigned char)(b);
}
}
uint8_t bmpfileheader[14] = { 'B','M', 0,0,0,0, 0,0, 0,0, 54,0,0,0 };
uint8_t bmpinfoheader[40] = { 40,0,0,0, 0,0,0,0, 0,0,0,0, 1,0, 24,0 };
uint8_t bmppad[3] = {0,0,0};
bmpfileheader[ 2] = (uint8_t)(filesize );
bmpfileheader[ 3] = (uint8_t)(filesize>> 8);
bmpfileheader[ 4] = (uint8_t)(filesize>>16);
bmpfileheader[ 5] = (uint8_t)(filesize>>24);
bmpinfoheader[ 4] = (uint8_t)( w );
bmpinfoheader[ 5] = (uint8_t)( w>> 8);
bmpinfoheader[ 6] = (uint8_t)( w>>16);
bmpinfoheader[ 7] = (uint8_t)( w>>24);
bmpinfoheader[ 8] = (uint8_t)( h );
bmpinfoheader[ 9] = (uint8_t)( h>> 8);
bmpinfoheader[10] = (uint8_t)( h>>16);
bmpinfoheader[11] = (uint8_t)( h>>24);
uint8_t *ptr = out_buf;
size_t bytes;
bytes = 14;
memcpy(ptr, bmpfileheader, bytes);
ptr += bytes;
bytes = 40;
memcpy(ptr, bmpinfoheader, bytes);
ptr += bytes;
for(int i = 0; i < h; i++) {
bytes = 3*w;
memcpy(ptr, img + (w * (h - i - 1) * 3), bytes);
ptr += bytes;
bytes = (4 - (w * 3) % 4 ) % 4;
memcpy(ptr, bmppad, bytes);
ptr += bytes;
}
free(img);
//fclose(f);
return 0;
}
int bitmap_from_signal(uint8_t *img_buffer, size_t img_buffer_size, signal_t *signal, size_t w, size_t h) {
int filesize = 54 + 3 * w * h;
if (img_buffer_size != filesize) {
return -3;
}
size_t buffer_size = 1024;
size_t buffer_offset = buffer_size;
size_t items_left = signal->total_length;
float *buffer = (float*)malloc(buffer_size * sizeof(float));
if (!buffer) {
return -1;
}
memset(img_buffer, 0, filesize);
for (size_t i = 0; i < w; i++) {
for (size_t j = 0; j < h; j++) {
if (buffer_offset == buffer_size) {
size_t items_to_read = buffer_size;
if (items_to_read > items_left) {
items_to_read = items_left;
}
signal->get_data((j * w) + i, items_to_read, buffer);
buffer_offset = 0;
}
float pixel_f = buffer[buffer_offset];
uint32_t pixel = static_cast<uint32_t>(pixel_f);
uint8_t r = static_cast<uint8_t>(pixel >> 16 & 0xff);
uint8_t g = static_cast<uint8_t>(pixel >> 8 & 0xff);
uint8_t b = static_cast<uint8_t>(pixel & 0xff);
size_t x = i;
size_t y = (h - 1) - j;
img_buffer[(x+y*w)*3+0] = (uint8_t)(b);
img_buffer[(x+y*w)*3+1] = (uint8_t)(g);
img_buffer[(x+y*w)*3+2] = (uint8_t)(r);
buffer_offset++;
}
}
uint8_t bmpfileheader[14] = { 'B','M', 0,0,0,0, 0,0, 0,0, 54,0,0,0 };
uint8_t bmpinfoheader[40] = { 40,0,0,0, 0,0,0,0, 0,0,0,0, 1,0, 24,0 };
uint8_t bmppad[3] = {0,0,0};
bmpfileheader[ 2] = (uint8_t)(filesize );
bmpfileheader[ 3] = (uint8_t)(filesize>> 8);
bmpfileheader[ 4] = (uint8_t)(filesize>>16);
bmpfileheader[ 5] = (uint8_t)(filesize>>24);
bmpinfoheader[ 4] = (uint8_t)( w );
bmpinfoheader[ 5] = (uint8_t)( w>> 8);
bmpinfoheader[ 6] = (uint8_t)( w>>16);
bmpinfoheader[ 7] = (uint8_t)( w>>24);
bmpinfoheader[ 8] = (uint8_t)( h );
bmpinfoheader[ 9] = (uint8_t)( h>> 8);
bmpinfoheader[10] = (uint8_t)( h>>16);
bmpinfoheader[11] = (uint8_t)( h>>24);
uint8_t *ptr = img_buffer;
size_t bytes;
bytes = 14;
memcpy(ptr, bmpfileheader, bytes);
ptr += bytes;
bytes = 40;
memcpy(ptr, bmpinfoheader, bytes);
ptr += bytes;
for(int i = 0; i < h; i++) {
bytes = 3*w;
memcpy(ptr, img_buffer + (w * (h - i - 1) * 3), bytes);
ptr += bytes;
bytes = (4 - (w * 3) % 4 ) % 4;
memcpy(ptr, bmppad, bytes);
ptr += bytes;
}
free(buffer);
return 0;
}
#endif // _BITMAP_HELPERS_H_