diff options
| -rw-r--r-- | libass/ass_render.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libass/ass_render.c b/libass/ass_render.c index eaf135b..9498a18 100644 --- a/libass/ass_render.c +++ b/libass/ass_render.c @@ -511,7 +511,7 @@ static bool quantize_transform(double m[3][3], ASS_Vector *pos, // = m_zx * (x + sign(m_zx) * dx) + m_zy * (y + sign(m_zy) * dy) + z0. // D(f)--absolute value of error in quantity f - // as function of error in matrix coefficients, i. e. D(m_??). + // as function of error in matrix coefficients, i. e. D(m_ij) for i, j from {x, y, z}. // Error in constant is zero, i. e. D(dx) = D(dy) = D(z0) = 0. // In the following calculation errors are considered small // and second- and higher-order terms are dropped. @@ -536,7 +536,7 @@ static bool quantize_transform(double m[3][3], ASS_Vector *pos, // To estimate acceptable error in matrix coefficient // set error in all other coefficients to zero and solve system - // D(x_out) <= ACCURACY & D(y_out) <= ACCURACY for desired D(m_??). + // D(x_out) <= ACCURACY & D(y_out) <= ACCURACY for desired D(m_ij). // ACCURACY here is some part of total error, i. e. ACCURACY ~ POSITION_PRECISION. // Note that POSITION_PRECISION isn't total error, it's convenient constant. // True error can be up to several POSITION_PRECISION. @@ -1400,7 +1400,7 @@ get_bitmap_glyph(ASS_Renderer *render_priv, GlyphInfo *info, // Notation from quantize_transform(). // Note that goal here is to estimate acceptable error for stroking, i. e. D(x) and D(y). - // Matrix coefficients are constants now, so D(m_??) = 0. + // Matrix coefficients are constants now, so D(m_ij) = 0 for all i, j from {x, y, z}. // D(z) <= |m_zx| * D(x) + |m_zy| * D(y), // D(x_out) = D((m_xx * x + m_xy * y) / z) |