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use double and better math to avoid rounding errors especially with cm->inch conversion

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@40427 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Riccardo Mottola 2017-03-28 15:35:38 +00:00
parent 28b15bce9f
commit c774fd75c3
1 changed files with 7 additions and 7 deletions
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14
Source/NSBitmapImageRep+JPEG.m
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@ -393,7 +393,7 @@ static void gs_jpeg_memory_dest_destroy (j_compress_ptr cinfo)
JSAMPARRAY sclbuffer = NULL;
unsigned char *imgbuffer = NULL;
BOOL isProgressive;
unsigned x_density, y_density;
double x_density, y_density;
if (!(self = [super init]))
return nil;
@ -507,8 +507,8 @@ static void gs_jpeg_memory_dest_destroy (j_compress_ptr cinfo)
[self setProperty: NSImageProgressive
withValue: [NSNumber numberWithBool: isProgressive]];
x_density = cinfo.X_density;
y_density = cinfo.Y_density;
x_density = (double) cinfo.X_density;
y_density = (double) cinfo.Y_density;
if (x_density > 0 && y_density > 0)
{
unsigned short d_unit;
@ -517,16 +517,16 @@ static void gs_jpeg_memory_dest_destroy (j_compress_ptr cinfo)
/* we have dots/cm, convert to dots/inch*/
if (d_unit == 2)
{
x_density = (x_density * 254)/100;
y_density = (y_density * 254)/100;
x_density = x_density * 2.54;
y_density = y_density * 2.54;
}
if (!(x_density == 72 && y_density == 72))
{
NSSize pointSize;
pointSize = NSMakeSize((double)cinfo.output_width * (72.0 / (double)x_density),
(double)cinfo.output_height * (72.0 / (double)y_density));
pointSize = NSMakeSize((double)cinfo.output_width * 72.0 / x_density,
(double)cinfo.output_height * 72.0 / y_density);
[self setSize: pointSize];
}
}