static gboolean
gimp_operation_posterize_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
GimpPosterizeConfig *config = GIMP_POSTERIZE_CONFIG (point->config);
gfloat *src = in_buf;
gfloat *dest = out_buf;
gfloat levels;
if (! config)
return FALSE;
levels = config->levels - 1.0;
while (samples--)
{
dest[RED] = RINT (src[RED] * levels) / levels;
dest[GREEN] = RINT (src[GREEN] * levels) / levels;
dest[BLUE] = RINT (src[BLUE] * levels) / levels;
dest[ALPHA] = src[ALPHA];
src += 4;
dest += 4;
}
return TRUE;
}
static gboolean
gimp_operation_colorize_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
GimpColorizeConfig *config = GIMP_COLORIZE_CONFIG (point->config);
gfloat *src = in_buf;
gfloat *dest = out_buf;
GimpHSL hsl;
if (! config)
return FALSE;
hsl.h = config->hue;
hsl.s = config->saturation;
hsl.a = src[ALPHA];
while (samples--)
{
GimpRGB rgb;
gfloat lum = GIMP_RGB_LUMINANCE (src[RED],
src[GREEN],
src[BLUE]);
if (config->lightness > 0)
{
lum = lum * (1.0 - config->lightness);
lum += 1.0 - (1.0 - config->lightness);
}
else if (config->lightness < 0)
{
lum = lum * (config->lightness + 1.0);
}
hsl.l = lum;
gimp_hsl_to_rgb (&hsl, &rgb);
/* the code in base/colorize.c would multiply r,b,g with lum,
* but this is a bug since it should multiply with 255. We
* don't repeat this bug here (this is the reason why the gegl
* colorize is brighter than the legacy one).
*/
dest[RED] = rgb.r; /* * lum; */
dest[GREEN] = rgb.g; /* * lum; */
dest[BLUE] = rgb.b; /* * lum */;
dest[ALPHA] = rgb.a;
src += 4;
dest += 4;
}
return TRUE;
}
static gboolean
gimp_operation_brightness_contrast_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
GimpBrightnessContrastConfig *config = GIMP_BRIGHTNESS_CONTRAST_CONFIG (point->config);
gfloat *src = in_buf;
gfloat *dest = out_buf;
gdouble brightness;
gdouble slant;
if (! config)
return FALSE;
brightness = config->brightness / 2.0;
slant = tan ((config->contrast + 1) * G_PI_4);
while (samples--)
{
dest[RED] = gimp_operation_brightness_contrast_map (src[RED],
brightness,
slant);
dest[GREEN] = gimp_operation_brightness_contrast_map (src[GREEN],
brightness,
slant);
dest[BLUE] = gimp_operation_brightness_contrast_map (src[BLUE],
brightness,
slant);
dest[ALPHA] = src[ALPHA];
src += 4;
dest += 4;
}
return TRUE;
}
static gboolean
gimp_operation_curves_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi)
{
GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
GimpCurvesConfig *config = GIMP_CURVES_CONFIG (point->config);
gfloat *src = in_buf;
gfloat *dest = out_buf;
if (! config)
return FALSE;
gimp_curve_map_pixels (config->curve[0],
config->curve[1],
config->curve[2],
config->curve[3],
config->curve[4], src, dest, samples);
return TRUE;
}
static gboolean
gimp_operation_hue_saturation_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi)
{
GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
GimpHueSaturationConfig *config = GIMP_HUE_SATURATION_CONFIG (point->config);
gfloat *src = in_buf;
gfloat *dest = out_buf;
gfloat overlap;
if (! config)
return FALSE;
overlap = config->overlap / 2.0;
while (samples--)
{
GimpRGB rgb;
GimpHSL hsl;
gdouble h;
gint hue_counter;
gint hue = 0;
gint secondary_hue = 0;
gboolean use_secondary_hue = FALSE;
gfloat primary_intensity = 0.0;
gfloat secondary_intensity = 0.0;
rgb.r = src[RED];
rgb.g = src[GREEN];
rgb.b = src[BLUE];
gimp_rgb_to_hsl (&rgb, &hsl);
h = hsl.h * 6.0;
for (hue_counter = 0; hue_counter < 7; hue_counter++)
{
gdouble hue_threshold = (gdouble) hue_counter + 0.5;
if (h < ((gdouble) hue_threshold + overlap))
{
hue = hue_counter;
if (overlap > 0.0 && h > ((gdouble) hue_threshold - overlap))
{
use_secondary_hue = TRUE;
secondary_hue = hue_counter + 1;
secondary_intensity =
(h - (gdouble) hue_threshold + overlap) / (2.0 * overlap);
primary_intensity = 1.0 - secondary_intensity;
}
else
{
use_secondary_hue = FALSE;
}
break;
}
}
if (hue >= 6)
{
hue = 0;
use_secondary_hue = FALSE;
}
if (secondary_hue >= 6)
{
secondary_hue = 0;
}
/* transform into GimpHueRange values */
hue++;
secondary_hue++;
if (use_secondary_hue)
{
gdouble mapped_primary_hue;
gdouble mapped_secondary_hue;
gdouble diff;
mapped_primary_hue = map_hue (config, hue, hsl.h);
mapped_secondary_hue = map_hue (config, secondary_hue, hsl.h);
/* Find nearest hue on the circle between primary and
* secondary hue
*/
diff = mapped_primary_hue - mapped_secondary_hue;
if (diff < -0.5)
{
mapped_secondary_hue -= 1.0;
}
else if (diff >= 0.5)
{
mapped_secondary_hue += 1.0;
}
hsl.h = (mapped_primary_hue * primary_intensity +
mapped_secondary_hue * secondary_intensity);
hsl.s = (map_saturation (config, hue, hsl.s) * primary_intensity +
map_saturation (config, secondary_hue, hsl.s) * secondary_intensity);
hsl.l = (map_lightness (config, hue, hsl.l) * primary_intensity +
map_lightness (config, secondary_hue, hsl.l) * secondary_intensity);
}
else
{
hsl.h = map_hue (config, hue, hsl.h);
hsl.s = map_saturation (config, hue, hsl.s);
hsl.l = map_lightness (config, hue, hsl.l);
}
gimp_hsl_to_rgb (&hsl, &rgb);
dest[RED] = rgb.r;
dest[GREEN] = rgb.g;
dest[BLUE] = rgb.b;
dest[ALPHA] = src[ALPHA];
src += 4;
dest += 4;
}
return TRUE;
}
static gboolean
gimp_operation_color_balance_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
GimpColorBalanceConfig *config = GIMP_COLOR_BALANCE_CONFIG (point->config);
gfloat *src = in_buf;
gfloat *dest = out_buf;
if (! config)
return FALSE;
while (samples--)
{
gfloat r = src[RED];
gfloat g = src[GREEN];
gfloat b = src[BLUE];
gfloat r_n;
gfloat g_n;
gfloat b_n;
GimpRGB rgb = { r, g, b};
GimpHSL hsl;
gimp_rgb_to_hsl (&rgb, &hsl);
r_n = gimp_operation_color_balance_map (r, hsl.l,
config->cyan_red[GIMP_SHADOWS],
config->cyan_red[GIMP_MIDTONES],
config->cyan_red[GIMP_HIGHLIGHTS]);
g_n = gimp_operation_color_balance_map (g, hsl.l,
config->magenta_green[GIMP_SHADOWS],
config->magenta_green[GIMP_MIDTONES],
config->magenta_green[GIMP_HIGHLIGHTS]);
b_n = gimp_operation_color_balance_map (b, hsl.l,
config->yellow_blue[GIMP_SHADOWS],
config->yellow_blue[GIMP_MIDTONES],
config->yellow_blue[GIMP_HIGHLIGHTS]);
if (config->preserve_luminosity)
{
GimpHSL hsl2;
rgb.r = r_n;
rgb.g = g_n;
rgb.b = b_n;
gimp_rgb_to_hsl (&rgb, &hsl);
rgb.r = r;
rgb.g = g;
rgb.b = b;
gimp_rgb_to_hsl (&rgb, &hsl2);
hsl.l = hsl2.l;
gimp_hsl_to_rgb (&hsl, &rgb);
r_n = rgb.r;
g_n = rgb.g;
b_n = rgb.b;
}
dest[RED] = r_n;
dest[GREEN] = g_n;
dest[BLUE] = b_n;
dest[ALPHA] = src[ALPHA];
src += 4;
dest += 4;
}
return TRUE;
}
static gboolean
gimp_operation_desaturate_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
GimpDesaturateConfig *config = GIMP_DESATURATE_CONFIG (point->config);
gfloat *src = in_buf;
gfloat *dest = out_buf;
if (! config)
return FALSE;
switch (config->mode)
{
case GIMP_DESATURATE_LIGHTNESS:
while (samples--)
{
gfloat min, max, value;
max = MAX (src[0], src[1]);
max = MAX (max, src[2]);
min = MIN (src[0], src[1]);
min = MIN (min, src[2]);
value = (max + min) / 2;
dest[0] = value;
dest[1] = value;
dest[2] = value;
dest[3] = src[3];
src += 4;
dest += 4;
}
break;
case GIMP_DESATURATE_LUMINOSITY:
while (samples--)
{
gfloat value = GIMP_RGB_LUMINANCE (src[0], src[1], src[2]);
dest[0] = value;
dest[1] = value;
dest[2] = value;
dest[3] = src[3];
src += 4;
dest += 4;
}
break;
case GIMP_DESATURATE_AVERAGE:
while (samples--)
{
gfloat value = (src[0] + src[1] + src[2]) / 3;
dest[0] = value;
dest[1] = value;
dest[2] = value;
dest[3] = src[3];
src += 4;
dest += 4;
}
break;
}
return TRUE;
}
