Momentum-Apps/_image_tool/_convert_test.c

#include <stdint.h>
#include <stdio.h>

#include "images.h"

//-----------------------------------------------------------------------------
// This will be the plot function out of your graphics library
//
#define PLOT(x, y, c)                     \
    do {                                  \
        printf("%s", (c ? "#" : "."));    \
        if(x == img->w - 1) printf("\n"); \
    } while(0)

//+============================================================================
// The pain we endure to avoid code duplication cleanly
//
#define PLOTBYTE(b)                                                       \
    do {                                                                  \
        for(uint8_t m = 0x80; m; m >>= 1) {                               \
            PLOT(x, y, (b & m));                                          \
            if(((++x) == img->w) && !(x = 0) && ((++y) == img->h)) break; \
        }                                                                 \
    } while(0)

void show(const image_t* img) {
    // Some variables
    const uint8_t* bp = img->data;
    unsigned int x = 0;
    unsigned int y = 0;

    // Compressed
    if(img->c) {
        for(unsigned int i = 0; i < img->len; i++, bp++) {
            // Compressed data? {tag, length, value}
            if(*bp == img->tag) {
                for(uint16_t c = 0; c < bp[1]; c++) PLOTBYTE(bp[2]);
                bp += 3 - 1;
                i += 3 - 1;

                // Uncompressed byte
            } else {
                PLOTBYTE(*bp);
            }
        }

        // Not compressed
    } else {
        for(unsigned int i = 0; i < img->len; i++, bp++) PLOTBYTE(*bp);
    }
}

#undef PLOTBYTE

//+============================================================================
int main(void) {
    show(&img_zzz);
    return 0;
}