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app: add a handful more blending innerloops

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Adding linear burn, vivid light, linear light, pinlight and exclusion formulas
as described on
http://www.deepskycolors.com/archivo/2010/04/21/formulas-for-Photoshop-blending-modes.html
This commit is contained in:
Øyvind Kolås
2017-01-22 13:40:20 +01:00
parent 7079d5f730
commit c9ad09df61
1 changed files with 162 additions and 1 deletions
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163
app/operations/layer-modes/gimpblendcomposite.h
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@ -405,7 +405,7 @@ blendfun_screen (const float *dest,
} }
} }
static inline void static inline void /* aka linear_dodge */
blendfun_addition (const float *dest, blendfun_addition (const float *dest,
const float *src, const float *src,
float *out, float *out,
@ -429,6 +429,31 @@ blendfun_addition (const float *dest,
} }
} }
static inline void
blendfun_linear_burn (const float *dest,
const float *src,
float *out,
int samples)
{
while (samples--)
{
if (src[ALPHA] != 0.0f)
{
gint c;
for (c = 0; c < 3; c++)
out[c] = dest[c] + src[c] - 1.0f;
}
out[ALPHA] = src[ALPHA];
out += 4;
src += 4;
dest += 4;
}
}
static inline void static inline void
blendfun_subtract (const float *dest, blendfun_subtract (const float *dest,
const float *src, const float *src,
@ -1105,5 +1130,141 @@ blendfun_copy (const float *dest,
} }
} }
/* added according to:
http://www.deepskycolors.com/archivo/2010/04/21/formulas-for-Photoshop-blending-modes.html */
static inline void
blendfun_vivid_light (const float *dest,
const float *src,
float *out,
int samples)
{
while (samples--)
{
if (src[ALPHA] != 0.0f)
{
gint c;
for (c = 0; c < 3; c++)
{
gfloat comp;
if (src[c] > 0.5f)
{
comp = (1.0f - (1.0f - dest[c]) / (2.0f * (src[c] - 0.5f)));
}
else
{
comp = dest[c] / (1.0f - 2.0f * src[c]);
}
out[c] = comp;
}
}
out[ALPHA] = src[ALPHA];
out += 4;
src += 4;
dest += 4;
}
}
/* added according to:
http://www.deepskycolors.com/archivo/2010/04/21/formulas-for-Photoshop-blending-modes.html */
static inline void
blendfun_linear_light (const float *dest,
const float *src,
float *out,
int samples)
{
while (samples--)
{
if (src[ALPHA] != 0.0f)
{
gint c;
for (c = 0; c < 3; c++)
{
gfloat comp;
if (src[c] > 0.5f)
{
comp = dest[c] + 2.0 * (src[c] - 0.5);
}
else
{
comp = dest[c] + 2 * (src[c] - 1.0);
}
out[c] = comp;
}
}
out[ALPHA] = src[ALPHA];
out += 4;
src += 4;
dest += 4;
}
}
/* added according to:
http://www.deepskycolors.com/archivo/2010/04/21/formulas-for-Photoshop-blending-modes.html */
static inline void
blendfun_pin_light (const float *dest,
const float *src,
float *out,
int samples)
{
while (samples--)
{
if (src[ALPHA] != 0.0f)
{
gint c;
for (c = 0; c < 3; c++)
{
gfloat comp;
if (src[c] > 0.5f)
{
comp = MAX(dest[c], 2 * (src[c] - 0.5));
}
else
{
comp = MIN(dest[c], 2 * src[c]);
}
out[c] = comp;
}
}
out[ALPHA] = src[ALPHA];
out += 4;
src += 4;
dest += 4;
}
}
static inline void
blendfun_exclusion (const float *dest,
const float *src,
float *out,
int samples)
{
while (samples--)
{
if (src[ALPHA] != 0.0f)
{
gint c;
for (c = 0; c < 3; c++)
{
out[c] = 0.5f - 2.0f * (dest[c] - 0.5f) * (src[c] - 0.5f);
}
}
out[ALPHA] = src[ALPHA];
out += 4;
src += 4;
dest += 4;
}
}
#endif /* __GIMP_BLEND_COMPOSITE_H__ */ #endif /* __GIMP_BLEND_COMPOSITE_H__ */