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applied patch from Loren Merritt that replaces the floating-point 

2006-06-01  Sven Neumann  <sven@gimp.org>

	* plug-ins/common/sel_gauss.c: applied patch from Loren Merritt
	that replaces the floating-point implementation of selective
	gaussian blur with a fixed-point version (bug #342860).
This commit is contained in:
Sven Neumann 2006-06-01 10:16:56 +00:00 committed by Sven Neumann
parent 8387dd98a4
commit a3e967f4e8
2 changed files with 121 additions and 77 deletions
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11
ChangeLog
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@ -1,8 +1,13 @@
2006-06-01 Sven Neumann <sven@gimp.org>
* plug-ins/common/sel_gauss.c: applied patch from Loren Merritt
that replaces the floating-point implementation of selective
gaussian blur with a fixed-point version (bug #342860).
2006-05-31 Bill Skaggs <weskaggs@primate.ucdavis.edu>
* app/tools/gimprectangletool.[ch]: add "constrain" property
to specify whether to clip at image bounds when computing
dimensions.
* app/tools/gimprectangletool.[ch]: add "constrain" property to
specify whether to clip at image bounds when computing dimensions.
* app/tools/gimpcroptool.c
* app/tools/gimpnewrectselecttool.c: set "constrain" to TRUE.

187
plug-ins/common/sel_gauss.c
View File

@ -4,6 +4,7 @@
*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
* Copyright (C) 1999 Thom van Os <thom@vanos.com>
* Copyright (C) 2006 Loren Merritt
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -39,6 +40,14 @@
#define PLUG_IN_PROC "plug-in-sel-gauss"
#define PLUG_IN_BINARY "sel_gauss"
#ifndef ALWAYS_INLINE
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
# define ALWAYS_INLINE __attribute__((always_inline)) inline
#else
# define ALWAYS_INLINE inline
#endif
#endif
typedef struct
{
@ -292,11 +301,11 @@ sel_gauss_dialog (GimpDrawable *drawable)
}
static void
init_matrix (gdouble radius,
gdouble **mat,
gint num)
init_matrix (gdouble radius,
gdouble *mat,
gint num)
{
gint dx, dy;
gint dx;
gdouble sd, c1, c2;
/* This formula isn't really correct, but it'll do */
@ -304,91 +313,102 @@ init_matrix (gdouble radius,
c1 = 1.0 / sqrt (2.0 * G_PI * sd);
c2 = -2.0 * (sd * sd);
for (dy = 0; dy < num; dy++)
{
for (dx = dy; dx < num; dx++)
{
mat[dx][dy] = c1 * exp ((dx * dx + dy * dy)/ c2);
mat[dy][dx] = mat[dx][dy];
}
}
for (dx = 0; dx < num; dx++)
mat[dx] = c1 * exp ((dx * dx)/ c2);
}
static void
matrixmult (guchar *src,
guchar *dest,
gint width,
gint height,
gdouble **mat,
gint numrad,
gint bytes,
gboolean has_alpha,
gint maxdelta,
gboolean preview_mode)
static ALWAYS_INLINE void
matrixmult_int (const guchar *src,
guchar *dest,
gint width,
gint height,
const gdouble *mat,
gint numrad,
gint bytes,
gboolean has_alpha,
gint maxdelta,
gboolean preview_mode)
{
gint i, j, b, nb, x, y;
gint six, dix, tmp;
gint rowstride;
gdouble sum, fact, d, alpha = 1.0;
guchar *src_b, *src_db;
gdouble *m;
gint offset;
const gint nb = bytes - (has_alpha ? 1 : 0);
const gint rowstride = width * bytes;
gushort *imat = g_new (gushort, 2 * numrad);
nb = bytes - (has_alpha ? 1 : 0);
rowstride = width * bytes;
gdouble fsum, fscale;
gint i, j, b, x, y, d;
fsum = 0.0;
for (y = 1 - numrad; y < numrad; y++)
fsum += mat[ABS(y)];
/* Ensure that the sum fits in 32bits. */
fscale = 0x1000 / fsum;
for (y = 0; y < numrad; y++)
imat[numrad - y] = imat[numrad + y] = mat[y] * fscale;
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
dix = bytes * (width * y + x);
gint dix = bytes * (width * y + x);
if (has_alpha)
dest[dix + nb] = src[dix + nb];
for (b = 0; b < nb; b++)
{
sum = 0.0;
fact = 0.0;
src_db = src + dix + b;
const guchar *src_db = src + dix + b;
guint sum = 0;
guint fact = 0;
gint offset;
offset = rowstride * (y - numrad) + bytes * (x - numrad);
for (i = 1 - numrad; i < numrad; i++)
for (j = 1 - numrad; j < numrad; j++)
{
offset += bytes;
if (x + i < 0 || x + i >= width)
const guchar *src_b;
guint rowsum = 0;
guint rowfact = 0;
offset += rowstride;
if (y + j < 0 || y + j >= height)
continue;
six = offset;
m = mat[ABS(i)];
src_b = src + offset + b;
src_b = src + six + b;
for (j = 1 - numrad; j < numrad; j++)
for (i = 1 - numrad; i < numrad; i++)
{
src_b += rowstride;
six += rowstride;
gint tmp;
if (y + j < 0 || y + j >= height)
src_b += bytes;
if (x + i < 0 || x + i >= width)
continue;
tmp = *src_db - *src_b;
if (tmp > maxdelta || tmp < -maxdelta)
continue;
d = m[ABS(j)];
d = imat[numrad+i];
if (has_alpha)
{
if (!src[six + nb])
continue;
alpha = (double) src[six + nb] / 255.0;
d *= alpha;
}
sum += d * *src_b;
fact += d;
d *= src_b[nb - b];
rowsum += d * *src_b;
rowfact += d;
}
d = imat[numrad+j];
if (has_alpha)
{
rowsum >>= 8;
rowfact >>= 8;
}
sum += d * rowsum;
fact += d * rowfact;
}
if (fact == 0.0)
if (fact == 0)
dest[dix + b] = *src_db;
else
dest[dix + b] = sum / fact;
@ -396,8 +416,37 @@ matrixmult (guchar *src,
}
if (!(y % 10) && !preview_mode)
gimp_progress_update ((double)y / (double)height);
gimp_progress_update ((gdouble) y / (gdouble) height);
}
g_free (imat);
}
/* Force compilation of several versions with inlined constants. */
static void
matrixmult (const guchar *src,
guchar *dest,
gint width,
gint height,
const gdouble *mat,
gint numrad,
gint bytes,
gboolean has_alpha,
gint maxdelta,
gboolean preview_mode)
{
has_alpha = has_alpha ? 1 : 0;
#define EXPAND(BYTES, ALPHA)\
if (bytes == BYTES && has_alpha == ALPHA)\
return matrixmult_int (src, dest, width, height, mat, numrad,\
BYTES, ALPHA, maxdelta, preview_mode);
EXPAND (1, 0)
EXPAND (2, 1)
EXPAND (3, 0)
EXPAND (4, 1)
EXPAND (bytes, has_alpha)
#undef EXPAND
}
static void
@ -412,8 +461,7 @@ sel_gauss (GimpDrawable *drawable,
guchar *dest;
guchar *src;
gint x1, y1, x2, y2;
gint i;
gdouble **mat;
gdouble *mat;
gint numrad;
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
@ -424,9 +472,7 @@ sel_gauss (GimpDrawable *drawable,
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
numrad = (gint) (radius + 1.0);
mat = g_new (gdouble *, numrad);
for (i = 0; i < numrad; i++)
mat[i] = g_new (gdouble, numrad);
mat = g_new (gdouble, numrad);
init_matrix(radius, mat, numrad);
src = g_new (guchar, width * height * bytes);
@ -451,8 +497,6 @@ sel_gauss (GimpDrawable *drawable,
/* free up buffers */
g_free (src);
g_free (dest);
for (i = 0; i < numrad; i++)
g_free (mat[i]);
g_free (mat);
}
@ -469,8 +513,8 @@ preview_update (GimpPreview *preview)
GimpPixelRgn srcPR; /* Pixel region */
guchar *src;
gboolean has_alpha;
gint numrad, i;
gdouble **mat;
gint numrad;
gdouble *mat;
gdouble radius;
/* Get drawable info */
@ -499,19 +543,14 @@ preview_update (GimpPreview *preview)
radius = fabs (bvals.radius) + 1.0;
numrad = (gint) (radius + 1.0);
mat = g_new (gdouble *, numrad);
for (i = 0; i < numrad; i++)
mat[i] = g_new (gdouble, numrad);
init_matrix(radius, mat, numrad);
mat = g_new (gdouble, numrad);
init_matrix (radius, mat, numrad);
matrixmult (src, render_buffer,
width, height,
mat, numrad,
bytes, has_alpha, bvals.maxdelta, TRUE);
for (i = 0; i < numrad; i++)
g_free (mat[i]);
g_free (mat);
g_free (src);