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ex_color2.c
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ex_color2.c
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#define ALLEGRO_UNSTABLE
#include <allegro5/allegro.h>
#include <allegro5/allegro_font.h>
#include <allegro5/allegro_color.h>
#include <allegro5/allegro_primitives.h>
#include <stdlib.h>
#include <math.h>
#include "common.c"
#define FPS 60
typedef struct {
ALLEGRO_COLOR rgb;
float l, a, b;
} Color;
struct Example {
ALLEGRO_FONT *font;
ALLEGRO_BITMAP *lab[512];
ALLEGRO_COLOR black;
ALLEGRO_COLOR white;
Color color[2];
int mx, my;
int mb; // 1 = clicked, 2 = released, 3 = pressed
int slider;
int top_y;
int left_x;
int slider_x;
int half_x;
} example;
static void draw_lab(int l)
{
if (example.lab[l]) return;
example.lab[l] = al_create_bitmap(512, 512);
ALLEGRO_LOCKED_REGION *rg = al_lock_bitmap(example.lab[l],
ALLEGRO_PIXEL_FORMAT_ABGR_8888_LE, ALLEGRO_LOCK_WRITEONLY);
int x, y;
for (y = 0; y < 512; y++) {
for (x = 0; x < 512; x++) {
float a = (x - 511.0 / 2) / (511.0 / 2);
float b = (y - 511.0 / 2) / (511.0 / 2);
b = -b;
ALLEGRO_COLOR rgb = al_color_lab(l / 511.0, a, b);
if (!al_is_color_valid(rgb)) {
rgb = al_map_rgb_f(0, 0, 0);
}
int red = 255 * rgb.r;
int green = 255 * rgb.g;
int blue = 255 * rgb.b;
uint8_t *p = rg->data;
p += rg->pitch * y;
p += x * 4;
p[0] = red;
p[1] = green;
p[2] = blue;
p[3] = 255;
}
}
al_unlock_bitmap(example.lab[l]);
}
static void draw_range(int ci)
{
float l = example.color[ci].l;
int cx = (example.color[ci].a * 511.0 / 2) + 511.0 / 2;
int cy = (-example.color[ci].b * 511.0 / 2) + 511.0 / 2;
int r = 2;
/* Loop around the center in outward circles, starting with a 3 x 3
* rectangle, then 5 x 5, then 7 x 7, and so on.
* Each loop has four sides, top, right, bottom, left. For example
* these are the four loops for the 5 x 5 case:
* 1 2 3 4 .
* . .
* . .
* . .
* . . . . .
*
* o o o o 1
* . 2
* . 3
* . 4
* . . . . .
*
* o o o o o
* . o
* . o
* . 3 2 1 1
*
* o o o o o
* 4 o
* 3 o
* 2 o
* 1 o o o o
*
* 1654321
*/
while (true) {
bool found = false;
int x = cx - r / 2;
int y = cy - r / 2;
int i;
for (i = 0; i < r * 4; i++) {
if (i < r) x++;
else if (i < r * 2) y++;
else if (i < r * 3) x--;
else y--;
float a = (x - 511.0 / 2) / (511.0 / 2);
float b = (y - 511.0 / 2) / (511.0 / 2);
float rf, gf, bf;
b = -b;
al_color_lab_to_rgb(l, a, b, &rf, &gf, &bf);
if (rf < 0 || rf > 1 || gf < 0 || gf > 1 || bf < 0 || bf > 1) {
continue;
}
ALLEGRO_COLOR rgb = {rf, gf, bf, 1};
float d = al_color_distance_ciede2000(rgb, example.color[ci].rgb);
if (d <= 0.05) {
if (d > 0.04) {
al_draw_pixel(example.half_x * ci + example.left_x + x,
example.top_y + y, example.white);
}
found = true;
}
}
if (!found) break;
r += 2;
if (r > 128) break;
}
}
static void init(void)
{
example.black = al_map_rgb_f(0, 0, 0);
example.white = al_map_rgb_f(1, 1, 1);
example.left_x = 120;
example.top_y = 48;
example.slider_x = 48;
example.color[0].l = 0.5;
example.color[1].l = 0.5;
example.color[0].a = 0.2;
example.half_x = al_get_display_width(al_get_current_display()) / 2;
}
static void draw_axis(float x, float y, float a, float a2, float l,
float tl, char const *label, int ticks,
char const *numformat, float num1, float num2, float num) {
al_draw_line(x, y, x + l * cos(a), y - l * sin(a), example.white, 1);
int i;
for (i = 0; i < ticks; i++) {
float x2 = x + l * cos(a) * i / (ticks - 1);
float y2 = y - l * sin(a) * i / (ticks - 1);
al_draw_line(x2, y2, x2 + tl * cos(a2), y2 - tl * sin(a2), example.white, 1);
al_draw_textf(example.font, example.white,
(int)(x2 + (tl + 2) * cos(a2)), (int)(y2 - (tl + 2) * sin(a2)), ALLEGRO_ALIGN_RIGHT, numformat,
num1 + i * (num2 - num1) / (ticks - 1));
}
float lv = (num - num1) * l / (num2 - num1);
al_draw_filled_circle(x + lv * cos(a), y - lv * sin(a), 8, example.white);
al_draw_textf(example.font, example.white,
(int)(x + (l + 4) * cos(a)) - 24, (int)(y - (l + 4) * sin(a)) - 12, 0, "%s", label);
}
static void redraw(void)
{
al_clear_to_color(example.black);
int w = al_get_display_width(al_get_current_display());
int h = al_get_display_height(al_get_current_display());
int ci;
for (ci = 0; ci < 2; ci++) {
int cx = w / 2 * ci;
float l = example.color[ci].l;
float a = example.color[ci].a;
float b = example.color[ci].b;
ALLEGRO_COLOR rgb = example.color[ci].rgb;
draw_lab((int)(l * 511));
al_draw_bitmap(example.lab[(int)(l * 511)], cx + example.left_x, example.top_y, 0);
draw_axis(cx + example.left_x, example.top_y + 512.5, 0, ALLEGRO_PI / -2, 512, 16,
"a*", 11, "%.2f", -1, 1, a);
draw_axis(cx + example.left_x - 0.5, example.top_y + 512, ALLEGRO_PI / 2, ALLEGRO_PI,
512, 16, "b*", 11, "%.2f", -1, 1, b);
al_draw_textf(example.font, example.white, cx + example.left_x + 36, 8, 0,
"L*a*b* = %.2f/%.2f/%.2f sRGB = %.2f/%.2f/%.2f",
l, a, b, rgb.r, rgb.g, rgb.b);
draw_axis(cx + example.slider_x - 0.5, example.top_y + 512, ALLEGRO_PI / 2, ALLEGRO_PI,
512, 4, "L*", 3, "%.1f", 0, 1, l);
ALLEGRO_COLOR c = al_map_rgb_f(rgb.r, rgb.g, rgb.b);
al_draw_filled_rectangle(cx, h - 128, cx + w / 2, h, c);
draw_range(ci);
}
al_draw_textf(example.font, example.white, example.left_x + 36, 28, 0,
"%s", "Lab colors visible in sRGB");
al_draw_textf(example.font, example.white, example.half_x + example.left_x + 36, 28, 0,
"%s", "ellipse shows CIEDE2000 between 0.4 and 0.5");
al_draw_line(w / 2, 0, w / 2, h - 128, example.white, 4);
float dr = example.color[0].rgb.r - example.color[1].rgb.r;
float dg = example.color[0].rgb.g - example.color[1].rgb.g;
float db = example.color[0].rgb.b - example.color[1].rgb.b;
float drgb = sqrt(dr * dr + dg * dg + db * db);
float dl = example.color[0].l - example.color[1].l;
float da = example.color[0].a - example.color[1].a;
db = example.color[0].b - example.color[1].b;
float dlab = sqrt(da * da + db * db + dl * dl);
float d2000 = al_color_distance_ciede2000(example.color[0].rgb,
example.color[1].rgb);
al_draw_textf(example.font, example.white, w / 2, h - 64,
ALLEGRO_ALIGN_CENTER, "dRGB = %.2f", drgb);
al_draw_textf(example.font, example.white, w / 2, h - 64 + 12,
ALLEGRO_ALIGN_CENTER, "dLab = %.2f", dlab);
al_draw_textf(example.font, example.white, w / 2, h - 64 + 24,
ALLEGRO_ALIGN_CENTER, "CIEDE2000 = %.2f", d2000);
al_draw_rectangle(w / 2 - 80, h - 70, w / 2 + 80, h - 24,
example.white, 4);
}
static void update(void)
{
if (example.mb == 1 || example.mb == 3) {
if (example.mb == 1) {
int s = 0;
int mx = example.mx;
if (example.mx >= example.half_x) {
mx -= example.half_x;
s += 2;
}
if (mx > example.left_x) {
s += 1;
}
example.slider = s;
}
if (example.slider == 0 || example.slider == 2) {
int l = example.my - example.top_y;
if (l < 0) l = 0;
if (l > 511) l = 511;
example.color[example.slider / 2].l = 1 - l / 511.0;
}
else {
int ci = example.slider / 2;
int a = example.mx - example.left_x - ci * example.half_x;
int b = example.my - example.top_y;
b = 511 - b;
if (a < 0) a = 0;
if (b < 0) b = 0;
if (a > 511) a = 511;
if (b > 511) b = 511;
example.color[ci].a = 2 * a / 511.0 - 1;
example.color[ci].b = 2 * b / 511.0 - 1;
}
}
if (example.mb == 1) example.mb = 3;
if (example.mb == 2) example.mb = 0;
int ci;
for (ci = 0; ci < 2; ci++) {
example.color[ci].rgb = al_color_lab(example.color[ci].l,
example.color[ci].a, example.color[ci].b);
}
}
int main(int argc, char **argv)
{
ALLEGRO_TIMER *timer;
ALLEGRO_EVENT_QUEUE *queue;
ALLEGRO_DISPLAY *display;
int w = 1280, h = 720;
bool done = false;
bool need_redraw = true;
(void)argc;
(void)argv;
if (!al_init()) {
abort_example("Failed to init Allegro.\n");
}
al_init_font_addon();
example.font = al_create_builtin_font();
init_platform_specific();
display = al_create_display(w, h);
if (!display) {
abort_example("Error creating display.\n");
}
al_install_keyboard();
al_install_mouse();
al_init_primitives_addon();
init();
timer = al_create_timer(1.0 / FPS);
queue = al_create_event_queue();
al_register_event_source(queue, al_get_mouse_event_source());
al_register_event_source(queue, al_get_keyboard_event_source());
al_register_event_source(queue, al_get_timer_event_source(timer));
al_register_event_source(queue, al_get_display_event_source(display));
al_start_timer(timer);
while (!done) {
ALLEGRO_EVENT event;
if (need_redraw) {
redraw();
al_flip_display();
need_redraw = false;
}
while (true) {
al_wait_for_event(queue, &event);
switch (event.type) {
case ALLEGRO_EVENT_KEY_CHAR:
if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
done = true;
break;
case ALLEGRO_EVENT_MOUSE_AXES:
example.mx = event.mouse.x;
example.my = event.mouse.y;
break;
case ALLEGRO_EVENT_MOUSE_BUTTON_DOWN:
example.mb = 1;
break;
case ALLEGRO_EVENT_MOUSE_BUTTON_UP:
example.mb = 2;
break;
case ALLEGRO_EVENT_DISPLAY_CLOSE:
done = true;
break;
case ALLEGRO_EVENT_TIMER:
update();
need_redraw = true;
break;
}
if (al_is_event_queue_empty(queue))
break;
}
}
return 0;
}