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rgbgfx: Add an option to take the CGB's color profile into account

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This commit is contained in:
Jakub Kądziołka
2019-08-20 14:15:07 +02:00
parent b8d5dd1824
commit 91984cb7e7
4 changed files with 50 additions and 5 deletions
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1
include/gfx/main.h
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@@ -23,6 +23,7 @@ struct Options {
bool horizontal;
bool mirror;
bool unique;
bool colorcurve;
int trim;
char *tilemapfile;
bool tilemapout;

47
src/gfx/gb.c
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@@ -285,6 +285,30 @@ void output_attrmap_file(const struct Options *opts,
free(opts->attrmapfile);
}
/*
* based on the Gaussian-like curve used by SameBoy since commit
* 65dd02cc52f531dbbd3a7e6014e99d5b24e71a4c (Oct 2017)
* with ties resolved by comparing the difference of the squares.
*/
static int reverse_curve[] = {
0, 0, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7,
7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13,
13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14,
14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17,
17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18,
18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21,
21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 23, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24,
24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26,
26, 27, 27, 27, 27, 27, 28, 28, 28, 28, 29, 29, 29, 30, 30, 31,
};
void output_palette_file(const struct Options *opts,
const struct RawIndexedImage *raw_image)
{
@@ -297,10 +321,25 @@ void output_palette_file(const struct Options *opts,
err(1, "Opening palette file '%s' failed", opts->palfile);
for (i = 0; i < raw_image->num_colors; i++) {
color =
raw_image->palette[i].blue >> 3 << 10 |
raw_image->palette[i].green >> 3 << 5 |
raw_image->palette[i].red >> 3;
int r = raw_image->palette[i].red;
int g = raw_image->palette[i].green;
int b = raw_image->palette[i].blue;
if (opts->colorcurve) {
g = (g * 4 - b) / 3;
if (g < 0)
g = 0;
r = reverse_curve[r];
g = reverse_curve[g];
b = reverse_curve[b];
} else {
r >>= 3;
g >>= 3;
b >>= 3;
}
color = b << 10 | g << 5 | r;
cur_bytes[0] = color & 0xFF;
cur_bytes[1] = color >> 8;
fwrite(cur_bytes, 2, 1, f);

5
src/gfx/main.c
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@@ -45,7 +45,7 @@ int main(int argc, char *argv[])
depth = 2;
while ((ch = getopt(argc, argv, "Aa:Dd:Ffhmo:Tt:uPp:Vvx:")) != -1) {
while ((ch = getopt(argc, argv, "Aa:CDd:Ffhmo:Tt:uPp:Vvx:")) != -1) {
switch (ch) {
case 'A':
opts.attrmapout = true;
@@ -53,6 +53,9 @@ int main(int argc, char *argv[])
case 'a':
opts.attrmapfile = optarg;
break;
case 'C':
opts.colorcurve = true;
break;
case 'D':
opts.debug = true;
break;

2
src/gfx/rgbgfx.1
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@@ -61,6 +61,8 @@ Same as
but the attrmap file output name is made by taking the input filename, removing
the file extension, and appending
.Pa .attrmap .
.It Fl C
Use the color curve of the Game Boy Color when generating palettes.
.It Fl D
Debug features are enabled.
.It Fl f