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app: add gimp_gegl_dodgeburn() to replace the lut in GimpDodgeBurn

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This commit is contained in:
Michael Natterer
2012-04-02 19:17:06 +02:00
parent 72894671d5
commit 08d179acc6
2 changed files with 135 additions and 9 deletions
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118
app/gegl/gimp-gegl-loops.c
View File

@ -189,3 +189,121 @@ gimp_gegl_convolve (GeglBuffer *src_buffer,
}
}
}
void
gimp_gegl_dodgeburn (GeglBuffer *src_buffer,
const GeglRectangle *src_rect,
GeglBuffer *dest_buffer,
const GeglRectangle *dest_rect,
gdouble exposure,
GimpDodgeBurnType type,
GimpTransferMode mode)
{
GeglBufferIterator *iter;
if (type == GIMP_BURN)
exposure = -exposure;
iter = gegl_buffer_iterator_new (src_buffer, src_rect, 0,
babl_format ("R'G'B'A float"),
GEGL_BUFFER_READ, GEGL_ABYSS_NONE);
gegl_buffer_iterator_add (iter, dest_buffer, dest_rect, 0,
babl_format ("R'G'B'A float"),
GEGL_BUFFER_WRITE, GEGL_ABYSS_NONE);
switch (mode)
{
gfloat factor;
case GIMP_HIGHLIGHTS:
factor = 1.0 + exposure * (0.333333);
while (gegl_buffer_iterator_next (iter))
{
gfloat *src = iter->data[0];
gfloat *dest = iter->data[1];
while (iter->length--)
{
*dest++ = *src++ * factor;
*dest++ = *src++ * factor;
*dest++ = *src++ * factor;
*dest++ = *src++;
}
}
break;
case GIMP_MIDTONES:
if (exposure < 0)
factor = 1.0 - exposure * (0.333333);
else
factor = 1.0 / (1.0 + exposure);
while (gegl_buffer_iterator_next (iter))
{
gfloat *src = iter->data[0];
gfloat *dest = iter->data[1];
while (iter->length--)
{
*dest++ = pow (*src++, factor);
*dest++ = pow (*src++, factor);
*dest++ = pow (*src++, factor);
*dest++ = *src++;
}
}
break;
case GIMP_SHADOWS:
if (exposure >= 0)
factor = 0.333333 * exposure;
else
factor = -0.333333 * exposure;
while (gegl_buffer_iterator_next (iter))
{
gfloat *src = iter->data[0];
gfloat *dest = iter->data[1];
while (iter->length--)
{
if (exposure >= 0)
{
gfloat s;
s = *src++; *dest++ = factor + s - factor * s;
s = *src++; *dest++ = factor + s - factor * s;
s = *src++; *dest++ = factor + s - factor * s;
}
else
{
gfloat s;
s = *src++;
if (s < factor)
*dest++ = 0;
else /* factor <= value <=1 */
*dest++ = (s - factor) / (1.0 - factor);
s = *src++;
if (s < factor)
*dest++ = 0;
else /* factor <= value <=1 */
*dest++ = (s - factor) / (1.0 - factor);
s = *src++;
if (s < factor)
*dest++ = 0;
else /* factor <= value <=1 */
*dest++ = (s - factor) / (1.0 - factor);
}
*dest++ = *src++;
}
}
break;
}
}

26
app/gegl/gimp-gegl-loops.h
View File

@ -25,15 +25,23 @@
/* this is a pretty stupid port of concolve_region() that only works
* on a linear source buffer
*/
void gimp_gegl_convolve (GeglBuffer *src_buffer,
const GeglRectangle *src_rect,
GeglBuffer *dest_buffer,
const GeglRectangle *dest_rect,
const gfloat *matrix,
gint size,
gdouble divisor,
GimpConvolutionType mode,
gboolean alpha_weighting);
void gimp_gegl_convolve (GeglBuffer *src_buffer,
const GeglRectangle *src_rect,
GeglBuffer *dest_buffer,
const GeglRectangle *dest_rect,
const gfloat *matrix,
gint size,
gdouble divisor,
GimpConvolutionType mode,
gboolean alpha_weighting);
void gimp_gegl_dodgeburn (GeglBuffer *src_buffer,
const GeglRectangle *src_rect,
GeglBuffer *dest_buffer,
const GeglRectangle *dest_rect,
gdouble exposure,
GimpDodgeBurnType type,
GimpTransferMode mode);
#endif /* __GIMP_GEGL_LOOPS_H__ */