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Bill Skaggs <weskaggs@primate.ucdavis.edu>

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* plug-ins/common/emboss.c: fix usage of RGBA data,
	change to premultiplied alpha for embossing, hopefully
	fixes bug #72864.
This commit is contained in:
William Skaggs 2005-03-25 19:37:19 +00:00
parent 5e32e298d2
commit cd25a29605
2 changed files with 40 additions and 21 deletions
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6
ChangeLog
View file

@ -1,3 +1,9 @@
2005-03-25 Bill Skaggs <weskaggs@primate.ucdavis.edu>
* plug-ins/common/emboss.c: fix usage of RGBA data,
change to premultiplied alpha for embossing, hopefully
fixes bug #72864.
2005-03-25 Sven Neumann <sven@gimp.org>
* app/core/gimpmarshal.list: added VOID: OBJECT, OBJECT.

55
plug-ins/common/emboss.c
View file

@ -255,34 +255,47 @@ EmbossRow (guchar *src,
guint bypp,
gint alpha)
{
glong Nx, Ny, NdotL;
guchar *s1, *s2, *s3;
gint x, shade, b;
gint bytes;
glong Nx, Ny, NdotL;
guchar *s[3];
gint i, j, x, shade, b;
gint bytes;
gdouble M[3][3];
gdouble a;
/* mung pixels, avoiding edge pixels */
s1 = src + bypp;
s2 = s1 + (xSize * bypp);
s3 = s2 + (xSize * bypp);
s[0] = src + bypp;
s[1] = s[0] + (xSize * bypp);
s[2] = s[1] + (xSize * bypp);
dst += bypp;
bytes = (alpha) ? bypp - 1 : bypp;
if (texture)
texture += bypp;
texture += (xSize + 1) * bypp;
for (x = 1; x < xSize - 1; x++, s1 += bypp, s2 += bypp, s3 += bypp)
for (x = 1; x < xSize - 1; x++)
{
/*
* compute the normal from the src map. the type of the
* expression before the cast is compiler dependent. in
* some cases the sum is unsigned, in others it is
* signed. ergo, cast to signed.
*/
Nx = (int) (s1[-(int)bypp] + s2[-(int)bypp] + s3[-(int)bypp]
- s1[bypp] - s2[bypp] - s3[bypp]);
Ny = (int) (s3[-(int)bypp] + s3[0] + s3[bypp] - s1[-(int)bypp]
- s1[0] - s1[bypp]);
for (i = 0; i < 3; i++)
s[i] += bypp;
for (i = 0; i < 3; i++)
for (j = 0; j < 3; j++)
M[i][j] = 0;
for (b = 0; b < bytes; b++)
for (i = 0; i < 3; i++)
for (j = 0; j < 3; j++)
{
if (alpha)
a = s[i][(j - 1) * bypp + bytes] / (gdouble) 255;
else
a = 1;
M[i][j] += a * s[i][(j - 1) * bypp + b];
}
Nx = M[0][0] + M[1][0] + M[2][0] - M[0][2] - M[1][2] - M[2][2];
Ny = M[2][0] + M[2][1] + M[2][2] - M[0][0] - M[0][1] - M[0][2];
/* shade with distant light source */
if ( Nx == 0 && Ny == 0 )
@ -301,7 +314,7 @@ EmbossRow (guchar *src,
}
if (alpha)
{
*dst++ = s2[bytes]; /* preserve the alpha */
*dst++ = s[1][bytes]; /* preserve the alpha */
texture++;
}
}
@ -312,7 +325,7 @@ EmbossRow (guchar *src,
*dst++ = shade;
}
if (alpha)
*dst++ = s2[bytes]; /* preserve the alpha */
*dst++ = s[1][bytes]; /* preserve the alpha */
}
}
if (texture)