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<!-- ##### SECTION Title ##### -->
PNG Support
<!-- ##### SECTION Short_Description ##### -->
Reading and writing PNG images
<!-- ##### SECTION Long_Description ##### -->
<para>
The PNG functions allow reading PNG images into image surfaces, and writing
any surface to a PNG file.
</para>
<!-- ##### SECTION See_Also ##### -->
<para>
<itemizedlist>
<listitem>#cairo_surface_t</listitem>
</itemizedlist>
</para>
<!-- ##### SECTION Stability_Level ##### -->
<!-- ##### MACRO CAIRO_HAS_PNG_FUNCTIONS ##### -->
<para>
Defined if the PNG functions are available.
This macro can be used to conditionally compile code using the cairo
PNG functions.
</para>
<!-- ##### FUNCTION cairo_image_surface_create_from_png ##### -->
<para>
</para>
@filename:
@Returns:
<!-- ##### USER_FUNCTION cairo_read_func_t ##### -->
<para>
</para>
@closure:
@data:
@length:
@Returns:
<!-- ##### FUNCTION cairo_image_surface_create_from_png_stream ##### -->
<para>
</para>
@read_func:
@closure:
@Returns:
<!-- ##### FUNCTION cairo_surface_write_to_png ##### -->
<para>
</para>
@surface:
@filename:
@Returns:
<!-- ##### USER_FUNCTION cairo_write_func_t ##### -->
<para>
</para>
@closure:
@data:
@length:
@Returns:
<!-- ##### FUNCTION cairo_surface_write_to_png_stream ##### -->
<para>
</para>
@surface:
@write_func:
@closure:
@Returns:
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