*** empty log message ***

3 files changed, 27 insertions, 3 deletions

diff --git a/html/en/drv/printer.html b/html/en/drv/printer.html
index 3ef31d4..6b6ca19 100644
--- a/html/en/drv/printer.html
+++ b/html/en/drv/printer.html
@@ -84,6 +84,28 @@ before creating the canvas.</p>
 	the name of the selected printer.</li>
 </ul>
 
+<h3>Notes</h3>
+
+<h4>Patterns</h4>
+<p>Usually when printing regions filled with patterns you have to compensate for 
+the printer high resolution or the pattern will come out very small. If you 
+don't want to create a high resolution version of your pattern, then the 
+simplest way is to use <strong>wdCanvasPattern</strong> to resize the pattern to 
+an expected millimeter size. This will increase the pattern raster size so it 
+will be more visible in the printer.</p>
+<p>But on some printers the result were not what we expect:</p>
+<ul>
+  <li>
+  Laser printers automatically increase the real size of the pattern, so it 
+	seems that <strong>wdCanvasPattern</strong> is not necessary on those 
+	printers.</li>
+	<li>
+  PDF and Postscript based printer drivers (like Adobe PDF Creator and CutePDF 
+	Writer) need that the pattern has a width multiple of 8, if not they will 
+	appear distorted with an increasing horizontal shift on every line. This 
+	does NOT applies to the CD_PDF or CD_PS drivers.</li>
+</ul>
+
 </body>
 
 </html>
diff --git a/src/wd.c b/src/wd.c
index 0bd4f9a..9332518 100644
--- a/src/wd.c
+++ b/src/wd.c
@@ -522,7 +522,7 @@ void wdCanvasGetTextBounds(cdCanvas* canvas, double x, double y, const char *s,
 
 void wdCanvasPattern(cdCanvas* canvas, int w, int h, const long *color, double w_mm, double h_mm)
 {
-  long *pattern = 0;
+  long *pattern = NULL;
   int w_pxl, h_pxl, x, y, cx, cy;
   int wratio, hratio;
   int *XTab, *YTab;
@@ -531,6 +531,7 @@ void wdCanvasPattern(cdCanvas* canvas, int w, int h, const long *color, double w
 
   cdCanvasMM2Pixel(canvas, w_mm, h_mm, &w_pxl, &h_pxl);
 
+  /* to preserve the pattern characteristics must be an integer number */
   wratio = cdRound((double)w_pxl/(double)w);
   hratio = cdRound((double)h_pxl/(double)h);
 
@@ -564,7 +565,7 @@ void wdCanvasPattern(cdCanvas* canvas, int w, int h, const long *color, double w
 
 void wdCanvasStipple(cdCanvas* canvas, int w, int h, const unsigned char *fgbg, double w_mm, double h_mm)
 {
-  unsigned char *stipple = 0;
+  unsigned char *stipple = NULL;
   int w_pxl, h_pxl, x, y, cx, cy;
   int wratio, hratio;
   int *XTab, *YTab;
@@ -573,6 +574,7 @@ void wdCanvasStipple(cdCanvas* canvas, int w, int h, const unsigned char *fgbg,
 
   cdCanvasMM2Pixel(canvas, w_mm, h_mm, &w_pxl, &h_pxl);
 
+  /* to preserve the pattern characteristics must be an integer number */
   wratio = cdRound((double)w_pxl/(double)w);
   hratio = cdRound((double)h_pxl/(double)h);
 
diff --git a/src/win32/cdwin.c b/src/win32/cdwin.c
index 4b38187..313e833 100644
--- a/src/win32/cdwin.c
+++ b/src/win32/cdwin.c
@@ -595,7 +595,7 @@ static void cdpattern(cdCtxCanvas* ctxcanvas, int w, int h, const long int *colo
   if (!cdwCreateDIB(&dib))
     return;
 
-  /* important to preserve pattern size during printing */
+  /* trying to preserve pattern size during printing */
   set_dib_res(&dib, ctxcanvas);
 
   cdwDIBEncodePattern(&dib, colors);