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Topic: exception with hint(SMOOTH_IMAGES) (Read 301 times) |
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arielm
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exception with hint(SMOOTH_IMAGES)
« on: Jun 1st, 2003, 10:33am » |
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sometimes (tested with 0054), playing with texture mapping and using hint(SMOOTH_IMAGES) cause a
"ArrayIndexOutOfBoundsException at BPolygon.scanline"
this bug is hard to reproduce, but the following manage to do it:
Code:
BImage img;
float a = 0.0;
void setup()
{
size(200, 200);
hint(SMOOTH_IMAGES);
fill(255);
img = loadImage("paradis.jpg"); // 180 x 210
}
void loop()
{
rotateY(a);
a += radians(1.0);
image(img, 0.0, 0.0, 90.0, 105.0, 0.0, 0.0, 179.0, 209.0);
}
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the exception is occuring when the rotation angle is about 120 degrees, but with other "image" parameters, it can happen before...
n.b: i don't know if it's like this by design, but if i would have use 180.0 and 210.0 as the last 2 params of image() in loop(), this same exception would have occur from frame 0...
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Ariel Malka | www.chronotext.org
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arielm
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Re: exception with hint(SMOOTH_IMAGES)
« Reply #2 on: Jun 2nd, 2003, 9:59pm » |
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just a supposition why (smoothed) text is not affected by this bug:
could it be because each 64x64 font character bitmap have a huge pixels int[] of 64x64x4 instead of 64x64?
maybe as a temporary workaround, it could help to extend the size of the pixels array of BImages canditate to smoothed texture mapping (the question is how much to extend...)
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Ariel Malka | www.chronotext.org
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arielm
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Re: exception with hint(SMOOTH_IMAGES)
« Reply #3 on: Jun 5th, 2003, 12:43pm » |
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okay, it seems that extending the pixels array of an image by 2 rows is a workaroung to this bug!
then, the following corrected code will work smoothly...
Code:
BImage img;
float a = 0.0;
void setup()
{
size(200, 200);
hint(SMOOTH_IMAGES);
fill(255);
img = loadImage("paradis.jpg"); // 180 x 210
int n = 180 * 2; // adding 2 "rows" to the image is enough...
int temp[] = new int[img.pixels.length + n];
System.arraycopy(img.pixels, 0, temp, 0, img.pixels.length);
img.pixels = temp;
// Q: should i trust java for correct garbage collecting here?
}
void loop()
{
rotateY(a);
a += radians(1.0);
image(img, 0.0, 0.0, 90.0, 105.0, 0.0, 0.0, 180.0, 210.0);
}
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Ariel Malka | www.chronotext.org
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fry
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Re: exception with hint(SMOOTH_IMAGES)
« Reply #4 on: Sep 18th, 2003, 4:30am » |
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finally found this one.. have fixed it many times now.. same four lines of code, but they've produced many bugs..
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