[cairo-commit] src/cairo-ps-surface.c

[Adrian Johnson]

 src/cairo-ps-surface.c |   20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

New commits:
commit 477bcd89d716be372ebecc2b89381f4d9745f5e2
Author: Adrian Johnson <ajohnson at redneon.com>
Date:   Thu Feb 2 22:58:06 2012 +1030

    ps: ensure shading domain is [ 0 1 ]
    
    Printing to a printer with an Adobe PostScript 3 interpreter fails
    with rangecheck when the shading domain is not [ 0 1 ]. Workaround
    this by using a type 3 function to map from [ 0 1] to the required
    domain.

diff --git a/src/cairo-ps-surface.c b/src/cairo-ps-surface.c
index f20bd4f..62b7d64 100644
--- a/src/cairo-ps-surface.c
+++ b/src/cairo-ps-surface.c
@@ -3722,10 +3722,6 @@ _cairo_ps_surface_emit_gradient (cairo_ps_surface_t       *surface,
 				     MAX (end.radius, 0));
     }
 
-    _cairo_output_stream_printf (surface->stream,
-				 "      /Domain [ %f %f ]\n",
-				 domain[0], domain[1]);
-
     if (pattern->base.extend != CAIRO_EXTEND_NONE) {
 	_cairo_output_stream_printf (surface->stream,
                                      "      /Extend [ true true ]\n");
@@ -3734,8 +3730,22 @@ _cairo_ps_surface_emit_gradient (cairo_ps_surface_t       *surface,
                                      "      /Extend [ false false ]\n");
     }
 
+    if (domain[0] == 0.0 && domain[1] == 1.0) {
+	_cairo_output_stream_printf (surface->stream,
+				     "      /Function CairoFunction\n");
+    } else {
+	_cairo_output_stream_printf (surface->stream,
+				     "      /Function <<\n"
+				     "         /FunctionType 3\n"
+				     "         /Domain [ 0 1 ]\n"
+				     "         /Bounds [ ]\n"
+				     "         /Encode [ %f %f ]\n"
+				     "         /Functions [ CairoFunction ]\n"
+				     "      >>\n",
+				     domain[0], domain[1]);
+    }
+
     _cairo_output_stream_printf (surface->stream,
-				 "      /Function CairoFunction\n"
 				 "   >>\n");
 
     if (is_ps_pattern) {