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RandR rotations and reflections offset by one pixel

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The matrix computation for rotation and reflection resulted in dropping a
row or column of pixels as the offsets used in the matrix computations used
width and height rather than width-1 and height-1.

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard 2009-02-25 10:12:23 -08:00
parent 4e8d98b61e
commit 77c7a64e88
1 changed files with 14 additions and 14 deletions
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28
randr/rrtransform.c
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@ -185,21 +185,21 @@ RRTransformCompute (int x,
break;
case RR_Rotate_90:
f_rot_cos = 0; f_rot_sin = 1;
f_rot_dx = height; f_rot_dy = 0;
f_rot_dx = height-1; f_rot_dy = 0;
rot_cos = F ( 0); rot_sin = F ( 1);
rot_dx = F ( height); rot_dy = F (0);
rot_dx = F (height-1); rot_dy = F (0);
break;
case RR_Rotate_180:
f_rot_cos = -1; f_rot_sin = 0;
f_rot_dx = width; f_rot_dy = height;
f_rot_dx = width - 1; f_rot_dy = height - 1;
rot_cos = F (-1); rot_sin = F ( 0);
rot_dx = F (width); rot_dy = F ( height);
rot_dx = F (width-1); rot_dy = F ( height-1);
break;
case RR_Rotate_270:
f_rot_cos = 0; f_rot_sin = -1;
f_rot_dx = 0; f_rot_dy = width;
f_rot_dx = 0; f_rot_dy = width-1;
rot_cos = F ( 0); rot_sin = F (-1);
rot_dx = F ( 0); rot_dy = F ( width);
rot_dx = F ( 0); rot_dy = F ( width-1);
break;
}
@ -222,11 +222,11 @@ RRTransformCompute (int x,
f_scale_x = -1;
scale_x = F(-1);
if (rotation & (RR_Rotate_0|RR_Rotate_180)) {
f_scale_dx = width;
scale_dx = F(width);
f_scale_dx = width-1;
scale_dx = F(width-1);
} else {
f_scale_dx = height;
scale_dx = F(height);
f_scale_dx = height-1;
scale_dx = F(height-1);
}
}
if (rotation & RR_Reflect_Y)
@ -234,11 +234,11 @@ RRTransformCompute (int x,
f_scale_y = -1;
scale_y = F(-1);
if (rotation & (RR_Rotate_0|RR_Rotate_180)) {
f_scale_dy = height;
scale_dy = F(height);
f_scale_dy = height-1;
scale_dy = F(height-1);
} else {
f_scale_dy = width;
scale_dy = F(width);
f_scale_dy = width-1;
scale_dy = F(width-1);
}
}