notgne2/tuxpaint-pencil-sharpener
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Color mixer: Break color average calculation out

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Needs to be a function that we can also call on Undo & Redo
actions.
This commit is contained in:
Bill Kendrick 2022-01-28 01:00:36 -08:00
parent 3e28289db2
commit 4ae07338bf
1 changed files with 61 additions and 47 deletions
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108
src/tuxpaint.c
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@ -2101,6 +2101,7 @@ static int do_new_dialog_add_colors(SDL_Surface * *thumbs, int num_files, int *d
static int do_color_picker(void);
static int do_color_sel(int temp_mode);
static int do_color_mix(void);
static void calc_color_mixer_average(float * out_h, float * out_s, float * out_v);
static void draw_color_mixer_tooltip(void);
static void draw_color_mix_undo_redo(void);
static void render_color_button(int the_color, SDL_Surface * decoration, SDL_Surface * icon);
@ -22242,7 +22243,6 @@ static int do_color_mix(void)
SDL_Surface *backup;
SDL_Rect r_final;
int old_color_mixer_reset;
int tot_count;
val_x = val_y = motioner = 0;
valhat_x = valhat_y = hatmotioner = 0;
@ -22575,54 +22575,9 @@ static int do_color_mix(void)
{
/* Blending in some color */
float circ_mean_avg_sin, circ_mean_avg_cos;
int tot_count_hue;
float sat, val;
color_mixer_color_counts[btn_clicked]++;
tot_count = tot_count_hue = 0;
circ_mean_avg_sin = circ_mean_avg_cos = 0.0;
sat = val = 0.0;
for (i = 0; i < NUM_MIXER_COLORS; i++)
{
tot_count += color_mixer_color_counts[i];
if (mixer_hsv[i][0] != -1)
{
tot_count_hue += color_mixer_color_counts[i];
circ_mean_avg_sin += (sin(mixer_hsv[i][0] * M_PI / 180.0) * color_mixer_color_counts[i]);
circ_mean_avg_cos += (cos(mixer_hsv[i][0] * M_PI / 180.0) * color_mixer_color_counts[i]);
}
sat += mixer_hsv[i][1] * (color_mixer_color_counts[i]);
val += mixer_hsv[i][2] * (color_mixer_color_counts[i]);
}
if (tot_count_hue == 0)
{
/* None of the colors we mixed has any hue! */
h = -1;
}
else
{
/* Average all the hues we have */
circ_mean_avg_sin /= tot_count_hue;
circ_mean_avg_cos /= tot_count_hue;
h = atan2(circ_mean_avg_sin, circ_mean_avg_cos) * 180.0 / M_PI;
if (h < 0.0)
h += 360.0;
else if (h >= 360.0)
h -= 360.0;
}
/* Average the saturation and values */
s = sat / tot_count;
v = val / tot_count;
calc_color_mixer_average(&h, &s, &v);
}
/* Record undo buffer */
@ -22783,6 +22738,65 @@ static int do_color_mix(void)
}
/**
* Take the colors chosen in the mixer, in their various
* proportions, and calculate an HSV value for the
* final color
*/
static void calc_color_mixer_average(float * out_h, float * out_s, float * out_v) {
float h, s, v;
float circ_mean_avg_sin, circ_mean_avg_cos;
int i, tot_count, tot_count_hue;
float sat, val;
tot_count = tot_count_hue = 0;
circ_mean_avg_sin = circ_mean_avg_cos = 0.0;
sat = val = 0.0;
for (i = 0; i < NUM_MIXER_COLORS; i++)
{
tot_count += color_mixer_color_counts[i];
if (mixer_hsv[i][0] != -1)
{
tot_count_hue += color_mixer_color_counts[i];
circ_mean_avg_sin += (sin(mixer_hsv[i][0] * M_PI / 180.0) * color_mixer_color_counts[i]);
circ_mean_avg_cos += (cos(mixer_hsv[i][0] * M_PI / 180.0) * color_mixer_color_counts[i]);
}
sat += mixer_hsv[i][1] * (color_mixer_color_counts[i]);
val += mixer_hsv[i][2] * (color_mixer_color_counts[i]);
}
if (tot_count_hue == 0)
{
/* None of the colors we mixed has any hue! */
h = -1;
}
else
{
/* Average all the hues we have */
circ_mean_avg_sin /= tot_count_hue;
circ_mean_avg_cos /= tot_count_hue;
h = atan2(circ_mean_avg_sin, circ_mean_avg_cos) * 180.0 / M_PI;
if (h < 0.0)
h += 360.0;
else if (h >= 360.0)
h -= 360.0;
}
/* Average the saturation and values */
s = sat / tot_count;
v = val / tot_count;
*out_h = h;
*out_s = s;
*out_v = v;
}
/**
* Draw the undo & redo buttons of the color mixer,
* making the buttons appear clickable ("up") or not ("off"),