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fixed line clipping (ticket #1284)

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This commit is contained in:
Vadim Pisarevsky 2012-03-29 13:06:38 +00:00
parent 1564fe9a83
commit 0404b2989e
2 changed files with 95 additions and 64 deletions
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125
modules/core/src/drawing.cpp
View File

@ -552,7 +552,7 @@ Line2( Mat& img, Point pt1, Point pt2, const void* color )
int dx, dy;
int ecount;
int ax, ay;
int i, j;
int i, j, x, y;
int x_step, y_step;
int cb = ((uchar*)color)[0];
int cg = ((uchar*)color)[1];
@ -560,20 +560,11 @@ Line2( Mat& img, Point pt1, Point pt2, const void* color )
int pix_size = (int)img.elemSize();
uchar *ptr = img.data, *tptr;
size_t step = img.step;
Size size = img.size();
Size size = img.size(), sizeScaled(size.width*XY_ONE, size.height*XY_ONE);
//assert( img && (nch == 1 || nch == 3) && img.depth() == CV_8U );
pt1.x -= XY_ONE*2;
pt1.y -= XY_ONE*2;
pt2.x -= XY_ONE*2;
pt2.y -= XY_ONE*2;
ptr += img.step*2 + 2*pix_size;
size.width = ((size.width - 5) << XY_SHIFT) + 1;
size.height = ((size.height - 5) << XY_SHIFT) + 1;
if( !clipLine( size, pt1, pt2 ))
if( !clipLine( sizeScaled, pt1, pt2 ))
return;
dx = pt2.x - pt1.x;
@ -620,40 +611,41 @@ Line2( Mat& img, Point pt1, Point pt2, const void* color )
if( pix_size == 3 )
{
#define ICV_PUT_POINT() \
{ \
tptr[0] = (uchar)cb; \
tptr[1] = (uchar)cg; \
tptr[2] = (uchar)cr; \
#define ICV_PUT_POINT(_x,_y) \
x = (_x); y = (_y); \
if( 0 <= x && x < size.width && \
0 <= y && y < size.height ) \
{ \
tptr = ptr + y*step + x*3; \
tptr[0] = (uchar)cb; \
tptr[1] = (uchar)cg; \
tptr[2] = (uchar)cr; \
}
tptr = ptr + ((pt2.x + (XY_ONE >> 1))>> XY_SHIFT)*3 +
((pt2.y + (XY_ONE >> 1)) >> XY_SHIFT)*step;
ICV_PUT_POINT();
ICV_PUT_POINT((pt2.x + (XY_ONE >> 1)) >> XY_SHIFT,
(pt2.y + (XY_ONE >> 1)) >> XY_SHIFT);
if( ax > ay )
{
ptr += (pt1.x >> XY_SHIFT) * 3;
pt1.x >>= XY_SHIFT;
while( ecount >= 0 )
{
tptr = ptr + (pt1.y >> XY_SHIFT) * step;
ICV_PUT_POINT();
ICV_PUT_POINT(pt1.x, pt1.y >> XY_SHIFT);
pt1.x++;
pt1.y += y_step;
ptr += 3;
ecount--;
}
}
else
{
ptr += (pt1.y >> XY_SHIFT) * step;
pt1.y >>= XY_SHIFT;
while( ecount >= 0 )
{
tptr = ptr + (pt1.x >> XY_SHIFT) * 3;
ICV_PUT_POINT();
ICV_PUT_POINT(pt1.x >> XY_SHIFT, pt1.y);
pt1.x += x_step;
ptr += step;
pt1.y++;
ecount--;
}
}
@ -662,80 +654,85 @@ Line2( Mat& img, Point pt1, Point pt2, const void* color )
}
else if( pix_size == 1 )
{
#define ICV_PUT_POINT() \
{ \
tptr[0] = (uchar)cb; \
#define ICV_PUT_POINT(_x,_y) \
x = (_x); y = (_y); \
if( 0 <= x && x < size.width && \
0 <= y && y < size.height ) \
{ \
tptr = ptr + y*step + x;\
tptr[0] = (uchar)cb; \
}
tptr = ptr + ((pt2.x + (XY_ONE >> 1))>> XY_SHIFT) +
((pt2.y + (XY_ONE >> 1)) >> XY_SHIFT)*step;
ICV_PUT_POINT();
ICV_PUT_POINT((pt2.x + (XY_ONE >> 1)) >> XY_SHIFT,
(pt2.y + (XY_ONE >> 1)) >> XY_SHIFT);
if( ax > ay )
{
ptr += (pt1.x >> XY_SHIFT);
pt1.x >>= XY_SHIFT;
while( ecount >= 0 )
{
tptr = ptr + (pt1.y >> XY_SHIFT) * step;
ICV_PUT_POINT();
ICV_PUT_POINT(pt1.x, pt1.y >> XY_SHIFT);
pt1.x++;
pt1.y += y_step;
ptr++;
ecount--;
}
}
else
{
ptr += (pt1.y >> XY_SHIFT) * step;
pt1.y >>= XY_SHIFT;
while( ecount >= 0 )
{
tptr = ptr + (pt1.x >> XY_SHIFT);
ICV_PUT_POINT();
ICV_PUT_POINT(pt1.x >> XY_SHIFT, pt1.y);
pt1.x += x_step;
ptr += step;
pt1.y++;
ecount--;
}
}
#undef ICV_PUT_POINT
}
else
{
#define ICV_PUT_POINT() \
for( j = 0; j < pix_size; j++ ) \
tptr[j] = ((uchar*)color)[j];
#define ICV_PUT_POINT(_x,_y) \
x = (_x); y = (_y); \
if( 0 <= x && x < size.width && \
0 <= y && y < size.height ) \
{ \
tptr = ptr + y*step + x*pix_size;\
for( j = 0; j < pix_size; j++ ) \
tptr[j] = ((uchar*)color)[j]; \
}
tptr = ptr + ((pt2.x + (XY_ONE >> 1))>> XY_SHIFT)*pix_size +
((pt2.y + (XY_ONE >> 1)) >> XY_SHIFT)*step;
ICV_PUT_POINT();
ICV_PUT_POINT((pt2.x + (XY_ONE >> 1)) >> XY_SHIFT,
(pt2.y + (XY_ONE >> 1)) >> XY_SHIFT);
if( ax > ay )
{
ptr += (pt1.x >> XY_SHIFT) * pix_size;
pt1.x >>= XY_SHIFT;
while( ecount >= 0 )
{
tptr = ptr + (pt1.y >> XY_SHIFT) * step;
ICV_PUT_POINT();
ICV_PUT_POINT(pt1.x, pt1.y >> XY_SHIFT);
pt1.x++;
pt1.y += y_step;
ptr += pix_size;
ecount--;
}
}
else
{
ptr += (pt1.y >> XY_SHIFT) * step;
pt1.y >>= XY_SHIFT;
while( ecount >= 0 )
{
tptr = ptr + (pt1.x >> XY_SHIFT) * pix_size;
ICV_PUT_POINT();
ICV_PUT_POINT(pt1.x >> XY_SHIFT, pt1.y);
pt1.x += x_step;
ptr += step;
pt1.y++;
ecount--;
}
}
#undef ICV_PUT_POINT
}
}
@ -1013,7 +1010,7 @@ FillConvexPoly( Mat& img, const Point* v, int npts, const void* color, int line_
LineAA( img, p0, p, color );
p0 = p;
}
xmin = (xmin + delta) >> shift;
xmax = (xmax + delta) >> shift;
ymin = (ymin + delta) >> shift;

34
modules/highgui/test/test_drawing.cpp
View File

@ -408,3 +408,37 @@ int CV_DrawingTest_C::checkLineIterator( Mat& _img )
TEST(Highgui_Drawing_CPP, regression) { CV_DrawingTest_CPP test; test.safe_run(); }
TEST(Highgui_Drawing_C, regression) { CV_DrawingTest_C test; test.safe_run(); }
class CV_FillConvexPolyTest : public cvtest::BaseTest
{
public:
CV_FillConvexPolyTest() {}
~CV_FillConvexPolyTest() {}
protected:
void run(int)
{
vector<Point> line1;
vector<Point> line2;
line1.push_back(Point(1, 1));
line1.push_back(Point(5, 1));
line1.push_back(Point(5, 8));
line1.push_back(Point(1, 8));
line2.push_back(Point(2, 2));
line2.push_back(Point(10, 2));
line2.push_back(Point(10, 16));
line2.push_back(Point(2, 16));
Mat gray0(10,10,CV_8U, Scalar(0));
fillConvexPoly(gray0, line1, Scalar(255), 8, 0);
int nz1 = countNonZero(gray0);
fillConvexPoly(gray0, line2, Scalar(0), 8, 1);
int nz2 = countNonZero(gray0)/255;
CV_Assert( nz1 == 40 && nz2 == 0 );
}
};
TEST(Highgui_Drawing_FillConvexPoly, clipping) { CV_FillConvexPolyTest test; test.safe_run(); }