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Better compression for Ultracode in BMP

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Also corrects colour shifting bug
File size is still bigger than it needs to be for Ultracode, but now uses 4bpp
This commit is contained in:
Robin Stuart 2020-08-12 13:19:56 +01:00
parent 20f767c4b6
commit b5e27d3e0b
5 changed files with 80 additions and 95 deletions
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45
backend/common.c
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@ -449,6 +449,51 @@ INTERNAL void pn_define_mode(char *mode, const unsigned int data[], const size_t
}
}
INTERNAL int colour_to_red(int colour) {
int return_val = 0;
switch(colour) {
case 8: // White
case 3: // Magenta
case 4: // Red
case 5: // Yellow
return_val = 255;
break;
}
return return_val;
}
INTERNAL int colour_to_green(int colour) {
int return_val = 0;
switch(colour) {
case 8: // White
case 1: // Cyan
case 5: // Yellow
case 6: // Green
return_val = 255;
break;
}
return return_val;
}
INTERNAL int colour_to_blue(int colour) {
int return_val = 0;
switch(colour) {
case 8: // White
case 1: // Cyan
case 2: // Blue
case 3: // Magenta
return_val = 255;
break;
}
return return_val;
}
#ifdef ZINT_TEST
/* Dumps hex-formatted codewords in symbol->errtxt (for use in testing) */
void debug_test_codeword_dump(struct zint_symbol *symbol, unsigned char *codewords, int length) {