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authorscuri <scuri>2010-06-16 17:18:08 +0000
committerscuri <scuri>2010-06-16 17:18:08 +0000
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@@ -27,8 +27,8 @@
<b>Image</b>, <b>Printer</b> and <b>Double Buffer</b> were implemented.</p>
<p>The main motivation for the use of Cairo was transparency for all the
primitives. Beyond that we got other features like anti-aliasing, gradient
-filling, transformations and back-ends (support to rendering: PDF, PS, SVG and
-PNG surfaces).</p>
+filling, transformations and other back-ends (support to rendering: PDF, PS, SVG and
+IMAGERGB surfaces).</p>
<p>This driver still does not completely replace the X-Windows and GDI Windows
base drivers, because Cairo does not have support for bitwise XOR operations and
for complex clipping regions.</p>
@@ -38,9 +38,12 @@ for complex clipping regions.</p>
This function affects only the <font face="Courier"><strong>cdCreateCanvas</strong></font> function call, once created
the canvas will be always a Cairo canvas. In fact the function affects primary the definitions
<font face="Courier"><strong>CD_NATIVEWINDOW</strong></font>,
- <strong><span style="font-family: Courier">CD_IMAGE</span></strong> and <strong>
+ <strong><span style="font-family: Courier">CD_IMAGE</span></strong>,
+ <strong><span style="font-family: Courier">CD_PRINTER</span></strong> and <strong>
<span style="font-family: Courier">CD_DBUFFER</span></strong>, because they are
- function calls and not static defines.</p>
+ function calls and not static defines.
+ <strong><span style="font-family: Courier">CD_PRINTER</span></strong> can only
+ be used along with GDK base driver in UNIX.</p>
<p>Using Cairo it is allowed to create more that one canvas at the same time for the same Window. And they can co-exist
with a standard GDK, Win32 or X-Windows canvas.</p>
<p>To enable the use of Cairo based drivers you must call the initialization function <font face="Courier"><strong>
@@ -60,7 +63,8 @@ used.</p>
<p>Similar to <a href="ps.html">CD_PS</a>, uses the same creation parameters.
But margins are not supported and Postscript level can be 2 (parameter -2)
- or 3 (parameter -3).</p>
+ or 3 (parameter -3). The &quot;CMD&quot; attribute is not supported, and the new
+ attribute &quot;DSCCOMMENT&quot; accepts a string that is saved as a DSC comment.</p>
<h4>CD_CAIRO_PDF - PDF Driver</h4>
@@ -84,7 +88,10 @@ used.</p>
returns the line size in bytes, when data is specified during creation then
stride is always width*32. Even when there is not alpha channel, data is
stored in 32 bits per pixel. Image data is also organized in top-bottom
- orientation, it means the data pointer points to the top-left corner.</p>
+ orientation, it means the data pointer points to the top-left corner. And
+ the &quot;WRITE2PNG&quot; attribute that accepts a filename to save the image as a PNG
+ file (this does not depends of the
+ <a href="http://www.tecgraf.puc-rio.br/im">IM</a> library).</p>
<h3>Behavior of Functions</h3>
<h4>Control&nbsp; </h4>