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PDF: Limit precision of Td operands

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As the translation is in text space, the full precision of a double
for numbers close to zero is not required. Limit the precision to the
same as for numbers > 1.
This commit is contained in:
Adrian Johnson 2008-07-08 21:12:28 +09:30
parent d5c7b87ca9
commit 0c05aa60f5
1 changed files with 6 additions and 0 deletions
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6
src/cairo-pdf-operators.c
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@ -985,6 +985,8 @@ _cairo_pdf_operators_set_text_matrix (cairo_pdf_operators_t *pdf_operators,
return _cairo_output_stream_get_status (pdf_operators->stream);
}
#define TEXT_MATRIX_TOLERANCE 1e-6
/* Set the translation components of the PDF text matrix to x, y. The
* 'Td' operator is used to transform the text matrix.
*/
@ -1009,6 +1011,10 @@ _cairo_pdf_operators_set_text_position (cairo_pdf_operators_t *pdf_operators,
pdf_operators->text_matrix.x0 = x;
pdf_operators->text_matrix.y0 = y;
cairo_matrix_multiply (&translate, &pdf_operators->text_matrix, &inverse);
if (fabs(translate.x0) < TEXT_MATRIX_TOLERANCE)
translate.x0 = 0.0;
if (fabs(translate.y0) < TEXT_MATRIX_TOLERANCE)
translate.y0 = 0.0;
_cairo_output_stream_printf (pdf_operators->stream,
"%f %f Td\n",
translate.x0,