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GimpOperationCageTransform: pre-full the coordinate buffer with no-displacement coordinate, to keep the background while rendering

This commit is contained in:
Michael Muré 2010-08-10 00:12:10 +02:00
parent 34b40a6c7e
commit 81c948f196
1 changed files with 31 additions and 0 deletions
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31
app/gegl/gimpoperationcagetransform.c
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@ -188,6 +188,37 @@ gimp_operation_cage_transform_process (GeglOperation *operation,
GeglRectangle cage_bb = gimp_cage_config_get_bounding_box (config);
GeglRectangle buffer_bb = *gegl_operation_source_get_bounding_box (operation, "input");
/* pre-fill the out buffer with no-displacement coordinate */
GeglBufferIterator *it = gegl_buffer_iterator_new (out_buf, roi, NULL, GEGL_BUFFER_WRITE);
while (gegl_buffer_iterator_next (it))
{
/* iterate inside the roi */
gint n_pixels = it->length;
gint x = it->roi->x; /* initial x */
gint y = it->roi->y; /* and y coordinates */
gfloat *output = it->data[0];
while(n_pixels--)
{
output[0] = x;
output[1] = y;
output += 2;
/* update x and y coordinates */
x++;
if (x >= (it->roi->x + it->roi->width))
{
x = it->roi->x;
y++;
}
}
}
/* compute, reverse and interpolate the transformation */
for (x = cage_bb.x; x < cage_bb.x + cage_bb.width - 1; x++)
{
for (y = cage_bb.y; y < cage_bb.y + cage_bb.height - 1; y++)