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Keep computed brush values from overflowing with large reduction factors. 

2004-11-11  Jay Cox  <jaycox@gimp.org>

	* app/base/brush-scale.c: Keep computed brush values from
	overflowing with large reduction factors.  Fixes bug #76228.
This commit is contained in:
Jay Cox 2004-11-11 09:10:48 +00:00 committed by jaycox
parent 7961719353
commit e1a47b5232
2 changed files with 25 additions and 20 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2004-11-11 Jay Cox <jaycox@gimp.org>
* app/base/brush-scale.c: Keep computed brush values from
overflowing with large reduction factors. Fixes bug #76228.
2004-11-11 Sven Neumann <sven@gimp.org>
* libgimpwidgets/gimpintstore.c

40
app/base/brush-scale.c
View File

@ -57,7 +57,7 @@ brush_scale_mask (MaskBuf *brush_mask,
fx = fx0 = (256.0 * src_width) / dest_width;
fy = fy0 = (256.0 * src_height) / dest_height;
area = fx0 * fy0;
area = (fx0 * fy0) >> 8;
x = x0 = 0;
y = y0 = 0;
@ -82,20 +82,20 @@ brush_scale_mask (MaskBuf *brush_mask,
if (dx)
{
value += dx * dy * src[x + src_width * y];
value += (dx * dy * src[x + src_width * y]) >> 8;
x++;
fx -= dx;
dx = 0;
}
while (fx >= 256)
{
value += 256 * dy * src[x + src_width * y];
value += dy * src[x + src_width * y];
x++;
fx -= 256;
}
if (fx)
{
value += fx * dy * src[x + src_width * y];
value += fx * dy * src[x + src_width * y] >> 8;
dx = 256 - fx;
}
y++;
@ -111,20 +111,20 @@ brush_scale_mask (MaskBuf *brush_mask,
if (dx)
{
value += dx * 256 * src[x + src_width * y];
value += dx * src[x + src_width * y];
x++;
fx -= dx;
dx = 0;
}
while (fx >= 256)
{
value += 256 * 256 * src[x + src_width * y];
value += 256 * src[x + src_width * y];
x++;
fx -= 256;
}
if (fx)
{
value += fx * 256 * src[x + src_width * y];
value += fx * src[x + src_width * y];
dx = 256 - fx;
}
y++;
@ -139,20 +139,20 @@ brush_scale_mask (MaskBuf *brush_mask,
if (dx)
{
value += dx * fy * src[x + src_width * y];
value += (dx * fy * src[x + src_width * y]) >> 8;
x++;
fx -= dx;
dx = 0;
}
while (fx >= 256)
{
value += 256 * fy * src[x + src_width * y];
value += fy * src[x + src_width * y];
x++;
fx -= 256;
}
if (fx)
{
value += fx * fy * src[x + src_width * y];
value += (fx * fy * src[x + src_width * y]) >> 8;
dx = 256 - fx;
}
dy = 256 - fy;
@ -210,7 +210,7 @@ brush_scale_pixmap (MaskBuf *pixmap,
fx = fx0 = (256.0 * src_width) / dest_width;
fy = fy0 = (256.0 * src_height) / dest_height;
area = fx0 * fy0;
area = (fx0 * fy0) >> 8;
x = x0 = 0;
y = y0 = 0;
@ -237,7 +237,7 @@ brush_scale_pixmap (MaskBuf *pixmap,
if (dx)
{
factor = dx * dy;
factor = (dx * dy) >> 8;
src_ptr = src + 3 * (x + y * src_width);
ADD_RGB (value, factor, src_ptr);
x++;
@ -246,7 +246,7 @@ brush_scale_pixmap (MaskBuf *pixmap,
}
while (fx >= 256)
{
factor = 256 * dy;
factor = dy;
src_ptr = src + 3 * (x + y * src_width);
ADD_RGB (value, factor, src_ptr);
x++;
@ -254,7 +254,7 @@ brush_scale_pixmap (MaskBuf *pixmap,
}
if (fx)
{
factor = fx * dy;
factor = (fx * dy) >> 8;
src_ptr = src + 3 * (x + y * src_width);
ADD_RGB (value, factor, src_ptr);
dx = 256 - fx;
@ -272,7 +272,7 @@ brush_scale_pixmap (MaskBuf *pixmap,
if (dx)
{
factor = dx * 256;
factor = dx;
src_ptr = src + 3 * (x + y * src_width);
ADD_RGB (value, factor, src_ptr);
x++;
@ -281,7 +281,7 @@ brush_scale_pixmap (MaskBuf *pixmap,
}
while (fx >= 256)
{
factor = 256 * 256;
factor = 256;
src_ptr = src + 3 * (x + y * src_width);
ADD_RGB (value, factor, src_ptr);
x++;
@ -289,7 +289,7 @@ brush_scale_pixmap (MaskBuf *pixmap,
}
if (fx)
{
factor = fx * 256;
factor = fx;
src_ptr = src + 3 * (x + y * src_width);
ADD_RGB (value, factor, src_ptr);
dx = 256 - fx;
@ -306,7 +306,7 @@ brush_scale_pixmap (MaskBuf *pixmap,
if (dx)
{
factor = dx * fy;
factor = (dx * fy) >> 8;
src_ptr = src + 3 * (x + y * src_width);
ADD_RGB (value, factor, src_ptr);
x++;
@ -315,7 +315,7 @@ brush_scale_pixmap (MaskBuf *pixmap,
}
while (fx >= 256)
{
factor = 256 * fy;
factor = fy;
src_ptr = src + 3 * (x + y * src_width);
ADD_RGB (value, factor, src_ptr);
x++;
@ -323,7 +323,7 @@ brush_scale_pixmap (MaskBuf *pixmap,
}
if (fx)
{
factor = fx * fy;
factor = (fx * fy) >> 8;
src_ptr = src + 3 * (x + y * src_width);
ADD_RGB (value, factor, src_ptr);
dx = 256 - fx;