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app: add "hard mix" blend mode

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Similar to the Photoshop mode of the same name.  Assigns
either 0 or 1 to each of the channels, depending on whether the
sum of source and destination channel values is less than, or
greater than (or equals to), one, respectively.

This is equivalent to inverting the source, and using it to perform
per-pixel, per-channel threshold against the destination, which is
useful for various effects.
This commit is contained in:
Ell
2017-02-04 16:04:59 -05:00
parent 5c873bd93f
commit 8f4700b839
7 changed files with 75 additions and 11 deletions
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42
app/operations/layer-modes/gimpoperationlayermode.c
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@ -1838,6 +1838,31 @@ blendfun_pin_light (const float *dest,
}
}
static inline void
blendfun_hard_mix (const float *dest,
const float *src,
float *out,
int samples)
{
while (samples--)
{
if (dest[ALPHA] != 0.0f && src[ALPHA] != 0.0f)
{
gint c;
for (c = 0; c < 3; c++)
{
out[c] = dest[c] + src[c] < 1.0f ? 0.0f : 1.0f;
}
}
out[ALPHA] = src[ALPHA];
out += 4;
src += 4;
dest += 4;
}
}
static inline void
blendfun_exclusion (const float *dest,
const float *src,
@ -1863,6 +1888,7 @@ blendfun_exclusion (const float *dest,
}
}
static inline void dummy_fun(void)
{
}
@ -1919,6 +1945,8 @@ static inline GimpBlendFunc gimp_layer_mode_get_blend_fun (GimpLayerMode mode)
case GIMP_LAYER_MODE_PIN_LIGHT: return blendfun_pin_light;
case GIMP_LAYER_MODE_LINEAR_LIGHT_LINEAR:
case GIMP_LAYER_MODE_LINEAR_LIGHT: return blendfun_linear_light;
case GIMP_LAYER_MODE_HARD_MIX_LINEAR:
case GIMP_LAYER_MODE_HARD_MIX: return blendfun_hard_mix;
case GIMP_LAYER_MODE_EXCLUSION_LINEAR:
case GIMP_LAYER_MODE_EXCLUSION: return blendfun_exclusion;
case GIMP_LAYER_MODE_LINEAR_BURN_LINEAR:
@ -2385,6 +2413,20 @@ static GimpLayerModeInfo gimp_layer_mode_infos[]=
GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
},
{ GIMP_LAYER_MODE_HARD_MIX,
"gimp:layer-mode",
GIMP_LAYER_MODE_FLAG_WANTS_LINEAR_DATA,
GIMP_LAYER_COMPOSITE_SRC_ATOP,
GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
},
{ GIMP_LAYER_MODE_HARD_MIX_LINEAR,
"gimp:layer-mode",
GIMP_LAYER_MODE_FLAG_WANTS_LINEAR_DATA,
GIMP_LAYER_COMPOSITE_SRC_ATOP,
GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
},
{ GIMP_LAYER_MODE_EXCLUSION,
"gimp:layer-mode",
GIMP_LAYER_MODE_FLAG_WANTS_LINEAR_DATA,