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Force all weight arrays to sum exactly to 65535. (Fixes #70971, reported

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Fri Feb  8 23:11:15 2002  Owen Taylor  <otaylor@redhat.com>

        * pixops/pixops.c: Force all weight arrays to sum exactly
        to 65535. (Fixes #70971, reported by Federico Mena Quintero)

        * Makefile.am (libgdk_pixbuf_1_3_la_DEPENDENCIES): Add
        libpixops.la.
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Owen Taylor 2002-02-09 04:14:53 +00:00 committed by Owen Taylor
parent 9ff27f0f4c
commit e16d01d6a6
3 changed files with 35 additions and 7 deletions
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8
gdk-pixbuf/ChangeLog
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@ -1,3 +1,11 @@
Fri Feb 8 23:11:15 2002 Owen Taylor <otaylor@redhat.com>
* pixops/pixops.c: Force all weight arrays to sum exactly
to 65535. (Fixes #70971, reported by Federico Mena Quintero)
* Makefile.am (libgdk_pixbuf_1_3_la_DEPENDENCIES): Add
libpixops.la.
2002-02-08 Federico Mena Quintero <federico@ximian.com>
* pixops/pixops.h: Fix comment; PixopsInterpType -> GdkInterpType.

2
gdk-pixbuf/Makefile.am
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@ -263,7 +263,7 @@ libgdk_pixbuf_1_3_la_LDFLAGS = @STRIP_BEGIN@ \
@STRIP_END@
libgdk_pixbuf_1_3_la_LIBADD = pixops/libpixops.la $(builtin_objs) $(GDK_PIXBUF_DEP_LIBS)
libgdk_pixbuf_1_3_la_DEPENDENCIES = $(builtin_objs) $(gdk_pixbuf_def)
libgdk_pixbuf_1_3_la_DEPENDENCIES = pixops/libpixops.la $(builtin_objs) $(gdk_pixbuf_def)
gdk_pixbuf_headers = \
gdk-pixbuf.h \

32
gdk-pixbuf/pixops/pixops.c
View File

@ -1098,6 +1098,7 @@ tile_make_weights (PixopsFilter *filter, double x_scale, double y_scale, double
double x = (double)j_offset / SUBSAMPLE;
double y = (double)i_offset / SUBSAMPLE;
int i,j;
int total = 0;
for (i = 0; i < n_y; i++)
{
@ -1105,6 +1106,7 @@ tile_make_weights (PixopsFilter *filter, double x_scale, double y_scale, double
if (i < y)
{
if (i + 1 > y)
th = MIN(i+1, y + 1/y_scale) - y;
else
@ -1120,6 +1122,8 @@ tile_make_weights (PixopsFilter *filter, double x_scale, double y_scale, double
for (j = 0; j < n_x; j++)
{
int weight;
if (j < x)
{
if (j + 1 > x)
@ -1135,8 +1139,12 @@ tile_make_weights (PixopsFilter *filter, double x_scale, double y_scale, double
tw = 0;
}
*(pixel_weights + n_x * i + j) = 65536 * tw * x_scale * th * y_scale * overall_alpha;
weight = 65536 * tw * x_scale * th * y_scale * overall_alpha + 0.5;
total += weight;
*(pixel_weights + n_x * i + j) = weight;
}
*(pixel_weights + n_x * n_y - 1) += 65536 - total;
}
}
}
@ -1184,7 +1192,8 @@ bilinear_make_fast_weights (PixopsFilter *filter, double x_scale, double y_scale
double x = (double)j_offset / SUBSAMPLE;
double y = (double)i_offset / SUBSAMPLE;
int i,j;
int total = 0;
if (x_scale > 1.0) /* Bilinear */
{
for (i = 0; i < n_x; i++)
@ -1251,7 +1260,13 @@ bilinear_make_fast_weights (PixopsFilter *filter, double x_scale, double y_scale
for (i = 0; i < n_y; i++)
for (j = 0; j < n_x; j++)
*(pixel_weights + n_x * i + j) = 65536 * x_weights[j] * x_scale * y_weights[i] * y_scale * overall_alpha + 0.5;
{
int weight = 65536 * x_weights[j] * x_scale * y_weights[i] * y_scale * overall_alpha + 0.5;
*(pixel_weights + n_x * i + j) = weight;
total += weight;
}
*(pixel_weights + n_x * n_y - 1) += 65536 - total;
}
g_free (x_weights);
@ -1336,19 +1351,24 @@ bilinear_make_weights (PixopsFilter *filter, double x_scale, double y_scale, dou
double x = (double)j_offset / SUBSAMPLE;
double y = (double)i_offset / SUBSAMPLE;
int i,j;
int total = 0;
for (i = 0; i < n_y; i++)
for (j = 0; j < n_x; j++)
{
double w;
int weight;
w = bilinear_quadrant (0.5 + j - (x + 1 / x_scale), 0.5 + j - x, 0.5 + i - (y + 1 / y_scale), 0.5 + i - y);
w += bilinear_quadrant (1.5 + x - j, 1.5 + (x + 1 / x_scale) - j, 0.5 + i - (y + 1 / y_scale), 0.5 + i - y);
w += bilinear_quadrant (0.5 + j - (x + 1 / x_scale), 0.5 + j - x, 1.5 + y - i, 1.5 + (y + 1 / y_scale) - i);
w += bilinear_quadrant (1.5 + x - j, 1.5 + (x + 1 / x_scale) - j, 1.5 + y - i, 1.5 + (y + 1 / y_scale) - i);
*(pixel_weights + n_x * i + j) = 65536 * w * x_scale * y_scale * overall_alpha;
weight = 65536 * w * x_scale * y_scale * overall_alpha + 0.5;
*(pixel_weights + n_x * i + j) = weight;
total += weight;
}
*(pixel_weights + n_x * n_y - 1) += 65536 - total;
}
}