This source file includes following definitions.
- mod_brightness
- mod_contrast
- mod_gamma
- mod_tint
- colormod
- init
- deinit
- exec
#include "filter_common.h"
#include <string.h>
#include <math.h>
#define GET_INT(x, ptr) (((ptr)->type == VAR_PTR) ? \
(x) = (*(int *)(ptr)->data) : \
((ptr)->type == VAR_CHAR) ? \
(x) = strtol((ptr)->data, 0, 0) \
: 0)
#define GET_DOUBLE(x, ptr) (((ptr)->type == VAR_PTR) ? \
(x) = (*(double *)(ptr)->data) : \
((ptr)->type == VAR_CHAR) ? \
(x) = strtod((ptr)->data, 0) \
: 0)
static void
mod_brightness(double t[256], double v)
{
int i;
for (i = 256; --i >= 0;)
t[i] += v;
}
static void
mod_contrast(double t[256], double v)
{
int i;
for (i = 256; --i >= 0;)
t[i] = ((t[i] - 0.5) * v) + 0.5;
}
static void
mod_gamma(double t[256], double v)
{
int i;
for (i = 256; --i >= 0;)
t[i] = pow(t[i], 1 / v);
}
static void
mod_tint(double t[256], double v)
{
int i;
for (i = 256; --i >= 0;)
t[i] *= v;
}
static Imlib_Image
colormod(Imlib_Image im, pIFunctionParam par)
{
double a_d[256], r_d[256], g_d[256], b_d[256];
DATA8 a_b[256], r_b[256], g_b[256], b_b[256];
pIFunctionParam ptr;
int x = 0, y = 0, h, w, i;
double v = 0.0;
imlib_context_set_image(im);
w = imlib_image_get_width();
h = imlib_image_get_height();
for (i = 256; --i >= 0;)
a_d[i] = r_d[i] = g_d[i] = b_d[i] = (double)i / 255;
for (ptr = par; ptr; ptr = ptr->next)
{
if (!strcmp("x", ptr->key))
{
GET_INT(x, ptr);
}
else if (!strcmp("y", ptr->key))
{
GET_INT(y, ptr);
}
else if (!strcmp("w", ptr->key))
{
GET_INT(w, ptr);
}
else if (!strcmp("h", ptr->key))
{
GET_INT(h, ptr);
}
else if (!memcmp("brightness", ptr->key, 10))
{
GET_DOUBLE(v, ptr);
if (!ptr->key[10])
{
mod_brightness(r_d, v);
mod_brightness(g_d, v);
mod_brightness(b_d, v);
mod_brightness(a_d, v);
}
else if (!strcmp("_r", ptr->key + 10))
{
mod_brightness(r_d, v);
}
else if (!strcmp("_g", ptr->key + 10))
{
mod_brightness(g_d, v);
}
else if (!strcmp("_b", ptr->key + 10))
{
mod_brightness(b_d, v);
}
else if (!strcmp("_a", ptr->key + 10))
{
mod_brightness(a_d, v);
}
}
else if (!memcmp("contrast", ptr->key, 8))
{
GET_DOUBLE(v, ptr);
if (!ptr->key[8])
{
mod_contrast(r_d, v);
mod_contrast(g_d, v);
mod_contrast(b_d, v);
mod_contrast(a_d, v);
}
else if (!strcmp("_r", ptr->key + 8))
{
mod_contrast(r_d, v);
}
else if (!strcmp("_g", ptr->key + 8))
{
mod_contrast(g_d, v);
}
else if (!strcmp("_b", ptr->key + 8))
{
mod_contrast(b_d, v);
}
else if (!strcmp("_a", ptr->key + 8))
{
mod_contrast(a_d, v);
}
}
else if (!memcmp("gamma", ptr->key, 5))
{
GET_DOUBLE(v, ptr);
if (!ptr->key[5])
{
mod_gamma(r_d, v);
mod_gamma(g_d, v);
mod_gamma(b_d, v);
mod_gamma(a_d, v);
}
else if (!strcmp("_r", ptr->key + 5))
{
mod_gamma(r_d, v);
}
else if (!strcmp("_g", ptr->key + 5))
{
mod_gamma(g_d, v);
}
else if (!strcmp("_b", ptr->key + 5))
{
mod_gamma(b_d, v);
}
else if (!strcmp("_a", ptr->key + 5))
{
mod_gamma(a_d, v);
}
}
else if (!memcmp("tint", ptr->key, 4))
{
GET_DOUBLE(v, ptr);
if (!ptr->key[4])
{
mod_tint(r_d, v);
mod_tint(g_d, v);
mod_tint(b_d, v);
mod_tint(a_d, v);
}
else if (!strcmp("_r", ptr->key + 4))
{
mod_tint(r_d, v);
}
else if (!strcmp("_g", ptr->key + 4))
{
mod_tint(g_d, v);
}
else if (!strcmp("_b", ptr->key + 4))
{
mod_tint(b_d, v);
}
else if (!strcmp("_a", ptr->key + 4))
{
mod_tint(a_d, v);
}
}
}
for (i = 256; --i >= 0;)
{
if (a_d[i] < 0)
a_d[i] = 0;
if (a_d[i] > 1)
a_d[i] = 1;
a_b[i] = a_d[i] * 255;
if (r_d[i] < 0)
r_d[i] = 0;
if (r_d[i] > 1)
r_d[i] = 1;
r_b[i] = r_d[i] * 255;
if (g_d[i] < 0)
g_d[i] = 0;
if (g_d[i] > 1)
g_d[i] = 1;
g_b[i] = g_d[i] * 255;
if (b_d[i] < 0)
b_d[i] = 0;
if (b_d[i] > 1)
b_d[i] = 1;
b_b[i] = b_d[i] * 255;
}
imlib_context_set_color_modifier(imlib_create_color_modifier());
imlib_set_color_modifier_tables(r_b, g_b, b_b, a_b);
imlib_apply_color_modifier_to_rectangle(x, y, w, h);
imlib_free_color_modifier();
return im;
}
void
init(struct imlib_filter_info *info)
{
char *filters[] = { "colormod" };
int i = (sizeof(filters) / sizeof(*filters));
info->name = strdup("Tinting");
info->author = strdup("Willem Monsuwe (willem@stack.nl)");
info->description =
strdup("Provides most common color modification filters.");
info->num_filters = i;
info->filters = malloc(sizeof(char *) * i);
while (--i >= 0)
info->filters[i] = strdup(filters[i]);
}
void
deinit()
{
return;
}
void *
exec(char *filter, void *im, pIFunctionParam par)
{
if (!strcmp(filter, "colormod"))
return colormod((Imlib_Image) im, par);
return im;
}