ImageSurface.this - multiple declarations

Function ImageSurface.this

Create a ImageSurface from a existing cairo_surface_t*. ImageSurface is a garbage collected class. It will call cairo_surface_destroy when it gets collected by the GC or when dispose() is called.

Prototype

this(
  cairo_surface_t* ptr
);

Warning

ptr's reference count is not increased by this function! Adjust reference count before calling it if necessary

Only use this if you know what your doing! This function should not be needed for standard cairoD usage.

Function ImageSurface.this

Creates an image surface of the specified format and dimensions. Initially the surface contents are all 0. (Specifically, within each pixel, each color or alpha channel belonging to format will be 0. The contents of bits within a pixel, but not belonging to the given format are undefined).

Prototype

this(
  cairo_format_t format,
  int width,
  int height
);

Parameters

NameDescription
format format of pixels in the surface to create
width width of the surface, in pixels
height height of the surface, in pixels

Function ImageSurface.this

Creates an image surface for the provided pixel data. The output buffer must be kept around until the Surface is destroyed or Surface.finish() is called on the surface. The initial contents of data will be used as the initial image contents; you must explicitly clear the buffer, using, for example, Context.rectangle() and Context.fill() if you want it cleared.

Note that the stride may be larger than width*bytes_per_pixel to provide proper alignment for each pixel and row. This alignment is required to allow high-performance rendering within cairo. The correct way to obtain a legal stride value is to call formatStrideForWidth with the desired format and maximum image width value, and then use the resulting stride value to allocate the data and to create the image surface. See formatStrideForWidth for example code.

Prototype

this(
  ubyte[] data,
  cairo_format_t format,
  int width,
  int height,
  int stride
);

Parameters

NameDescription
data a pointer to a buffer supplied by the application in which to write contents. This pointer must be suitably aligned for any kind of variable, (for example, a pointer returned by malloc).
format the format of pixels in the buffer
width the width of the image to be stored in the buffer
height the height of the image to be stored in the buffer
stride the number of bytes between the start of rows in the buffer as allocated. This value should always be computed by formatStrideForWidth before allocating the data buffer.

Authors

Johannes Pfau cairoD
Andrej Mitrovic cairoD
cairo team cairo

Copyright

License

cairoD wrapper/bindings Boost License 1.0
cairo LGPL 2.1 / MPL 1.1