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New function to make sure that the weights sum up to the correct total

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* pixops/pixops.c (correct_total): New function to make sure
	that the weights sum up to the correct total without introducing
	negative weights.
	(tile_make_weights, bilinear_make_fast_weights,
	bilinear_make_weights): Use correct_total.
This commit is contained in:
Matthias Clasen 2002-02-15 21:11:25 +00:00
parent dbe4dbe8e9
commit bc90028d8d
2 changed files with 36 additions and 9 deletions
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8
gdk-pixbuf/ChangeLog
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@ -1,3 +1,11 @@
2002-02-15 Matthias Clasen <matthias@YAST_ASK>
* pixops/pixops.c (correct_total): New function to make sure
that the weights sum up to the correct total without introducing
negative weights.
(tile_make_weights, bilinear_make_fast_weights,
bilinear_make_weights): Use correct_total.
2002-02-10 Matthias Clasen <matthias@local> 2002-02-10 Matthias Clasen <matthias@local>
* test-images.h (tiff1_test_3), test-loaders.c (main): Add a * test-images.h (tiff1_test_3), test-loaders.c (main): Add a

25
gdk-pixbuf/pixops/pixops.c
View File

@ -1077,6 +1077,25 @@ pixops_process (guchar *dest_buf,
g_free (line_bufs); g_free (line_bufs);
} }
static void
correct_total (int *weights,
int n_x,
int n_y,
int total,
double overall_alpha)
{
int correction = (int)(0.5 + 65536 * overall_alpha) - total;
int i;
for (i = n_x * n_y - 1; i >= 0; i--)
{
if (*(weights + i) + correction >= 0)
{
*(weights + i) += correction;
break;
}
}
}
static void static void
tile_make_weights (PixopsFilter *filter, double x_scale, double y_scale, double overall_alpha) tile_make_weights (PixopsFilter *filter, double x_scale, double y_scale, double overall_alpha)
{ {
@ -1144,7 +1163,7 @@ tile_make_weights (PixopsFilter *filter, double x_scale, double y_scale, double
*(pixel_weights + n_x * i + j) = weight; *(pixel_weights + n_x * i + j) = weight;
} }
*(pixel_weights + n_x * n_y - 1) += (int)(0.5 + 65536 * overall_alpha) - total; correct_total (pixel_weights, n_x, n_y, total, overall_alpha);
} }
} }
} }
@ -1266,7 +1285,7 @@ bilinear_make_fast_weights (PixopsFilter *filter, double x_scale, double y_scale
total += weight; total += weight;
} }
*(pixel_weights + n_x * n_y - 1) += (int)(0.5 + 65536 * overall_alpha) - total; correct_total (pixel_weights, n_x, n_y, total, overall_alpha);
} }
g_free (x_weights); g_free (x_weights);
@ -1368,7 +1387,7 @@ bilinear_make_weights (PixopsFilter *filter, double x_scale, double y_scale, dou
total += weight; total += weight;
} }
*(pixel_weights + n_x * n_y - 1) += (int)(0.5 + 65536 * overall_alpha) - total; correct_total (pixel_weights, n_x, n_y, total, overall_alpha);
} }
} }