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| author | Owen Taylor <otaylor@redhat.com> | 2002-02-09 04:14:53 +0000 |
|---|---|---|
| committer | Owen Taylor <otaylor@src.gnome.org> | 2002-02-09 04:14:53 +0000 |
| commit | e16d01d6a69f3482970f62dc3902a84cae0fb1ce (patch) | |
| tree | 6cfd20ab1fc844d9ca3cb4ffe14df0e3e32ffb4f /gdk-pixbuf/pixops/pixops.c | |
| parent | 9ff27f0f4c5780707bd0b70d37983453d8b98dea (diff) | |
| download | gdk-pixbuf-e16d01d6a69f3482970f62dc3902a84cae0fb1ce.tar.gz | |
Force all weight arrays to sum exactly to 65535. (Fixes #70971, reported
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.
Diffstat (limited to 'gdk-pixbuf/pixops/pixops.c')
| -rw-r--r-- | gdk-pixbuf/pixops/pixops.c | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/gdk-pixbuf/pixops/pixops.c b/gdk-pixbuf/pixops/pixops.c index 201c17c0e..12ba7f754 100644 --- a/gdk-pixbuf/pixops/pixops.c +++ b/gdk-pixbuf/pixops/pixops.c @@ -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; } } |