diff options
Diffstat (limited to 'draw/draw_scale.c')
| -rw-r--r-- | draw/draw_scale.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/draw/draw_scale.c b/draw/draw_scale.c index 9b94702e..40a5deff 100644 --- a/draw/draw_scale.c +++ b/draw/draw_scale.c @@ -989,6 +989,65 @@ scale_single_col(unsigned char *dst, unsigned char *src, fz_weights *weights, in #endif /* SINGLE_PIXEL_SPECIALS */ fz_pixmap * +fz_scale_pixmap_gridfit(fz_pixmap *src, float x, float y, float w, float h, int gridfit) +{ + if (gridfit) { + float n; + if (w > 0) { + /* Adjust the left hand edge, leftwards to a pixel boundary */ + n = (float)(int)x; /* n is now on a pixel boundary */ + if (n > x) /* Ensure it's the pixel boundary BELOW x */ + n -= 1.0f; + w += x-n; /* width gets wider as x >= n */ + x = n; + /* Adjust the right hand edge rightwards to a pixel boundary */ + n = (float)(int)w; /* n is now the integer width <= w */ + if (n != w) /* If w isn't an integer already, bump it */ + w = 1.0f + n;/* up to the next integer. */ + } else { + /* Adjust the right hand edge, rightwards to a pixel boundary */ + n = (float)(int)x; /* n is now on a pixel boundary */ + if (n > x) /* Ensure it's the pixel boundary <= x */ + n -= 1.0f; + if (n != x) /* If x isn't on a pixel boundary already, */ + n += 1.0f; /* make n be the pixel boundary above x. */ + w -= n-x; /* Expand width (more negative!) as n >= x */ + x = n; + /* Adjust the left hand edge leftwards to a pixel boundary */ + n = (float)(int)w; + if (n != w) + w = n - 1.0f; + } + if (h > 0) { + /* Adjust the bottom edge, downwards to a pixel boundary */ + n = (float)(int)y; /* n is now on a pixel boundary */ + if (n > y) /* Ensure it's the pixel boundary BELOW y */ + n -= 1.0f; + h += y-n; /* height gets larger as y >= n */ + y = n; + /* Adjust the top edge upwards to a pixel boundary */ + n = (float)(int)h; /* n is now the integer height <= h */ + if (n != h) /* If h isn't an integer already, bump it */ + h = 1.0f + n;/* up to the next integer. */ + } else { + /* Adjust the top edge, upwards to a pixel boundary */ + n = (float)(int)y; /* n is now on a pixel boundary */ + if (n > y) /* Ensure it's the pixel boundary <= y */ + n -= 1.0f; + if (n != y) /* If y isn't on a pixel boundary already, */ + n += 1.0f; /* make n be the pixel boundary above y. */ + h -= n-y; /* Expand height (more negative!) as n >= y */ + y = n; + /* Adjust the bottom edge downwards to a pixel boundary */ + n = (float)(int)h; + if (n != h) + h = n - 1.0f; + } + } + return fz_scale_pixmap(src, x, y, w, h); +} + +fz_pixmap * fz_scale_pixmap(fz_pixmap *src, float x, float y, float w, float h) { fz_scale_filter *filter = &fz_scale_filter_simple; |