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output: use doubles when converting in out_colour_get_rgb()

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and `out_colour_get_cmyk()`, to lessen chances of rounding
  errors (in particular for VC6)
test_large: fix regression in change to test for formatting
  `uint64_t` for `printf()`
win32/README: update MinGW/MSYS Qt version
This commit is contained in:
gitlost 2024-01-19 09:28:03 +00:00
parent 57fac4048d
commit 7c1bdba8ae
8 changed files with 33 additions and 32 deletions
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14
backend/output.c
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@ -129,13 +129,13 @@ INTERNAL int out_colour_get_rgb(const char *colour, unsigned char *red, unsigned
black = 100 - to_int((const unsigned char *) (comma3 + 1), (int) strlen(comma3 + 1));
val = 100 - to_int((const unsigned char *) colour, (int) (comma1 - colour)); /* Cyan */
*red = (int) roundf((0xFF * val * black) / 10000.0f);
*red = (int) round((0xFF * val * black) / 10000.0);
val = 100 - to_int((const unsigned char *) (comma1 + 1), (int) (comma2 - (comma1 + 1))); /* Magenta */
*green = (int) roundf((0xFF * val * black) / 10000.0f);
*green = (int) round((0xFF * val * black) / 10000.0);
val = 100 - to_int((const unsigned char *) (comma2 + 1), (int) (comma3 - (comma2 + 1))); /* Yellow */
*blue = (int) roundf((0xFF * val * black) / 10000.0f);
*blue = (int) round((0xFF * val * black) / 10000.0);
if (alpha) {
*alpha = 0xFF;
@ -176,10 +176,10 @@ INTERNAL int out_colour_get_cmyk(const char *colour, int *cyan, int *magenta, in
*cyan = *magenta = *yellow = 0;
*black = 100;
} else {
*cyan = (int) roundf((k - red) * 100.0f / k);
*magenta = (int) roundf((k - green) * 100.0f / k);
*yellow = (int) roundf((k - blue) * 100.0f / k);
*black = (int) roundf(((0xFF - k) * 100.0f) / 0xFF);
*cyan = (int) round((k - red) * 100.0 / k);
*magenta = (int) round((k - green) * 100.0 / k);
*yellow = (int) round((k - blue) * 100.0 / k);
*black = (int) round(((0xFF - k) * 100.0) / 0xFF);
}
if (rgb_alpha) {