cairo-Image-Surfaces {RGtk2} | R Documentation |
Image Surfaces
Description
Rendering to memory buffers
Methods and Functions
cairoImageSurfaceCreate(format, width, height)
cairoImageSurfaceCreateForData(data, format, width, height, stride)
cairoImageSurfaceGetData(surface)
cairoImageSurfaceGetFormat(surface)
cairoImageSurfaceGetWidth(surface)
cairoImageSurfaceGetHeight(surface)
cairoImageSurfaceGetStride(surface)
Detailed Description
Image surfaces provide the ability to render to memory buffers
either allocated by cairo or by the calling code. The supported
image formats are those defined in CairoFormat
.
Enums and Flags
CairoFormat
CairoFormat
is used to identify the memory format of
image data.
New entries may be added in future versions.
argb32
- each pixel is a 32-bit quantity, with
alpha in the upper 8 bits, then red, then green, then blue.
The 32-bit quantities are stored native-endian. Pre-multiplied
alpha is used. (That is, 50% transparent red is 0x80800000,
not 0x80ff0000.)
rgb24
- each pixel is a 32-bit quantity, with
the upper 8 bits unused. Red, Green, and Blue are stored
in the remaining 24 bits in that order.
a8
- each pixel is a 8-bit quantity holding
an alpha value.
a1
- each pixel is a 1-bit quantity holding
an alpha value. Pixels are packed together into 32-bit
quantities. The ordering of the bits matches the
endianess of the platform. On a big-endian machine, the
first pixel is in the uppermost bit, on a little-endian
machine the first pixel is in the least-significant bit.
rgb16-565
- undocumented
Author(s)
Derived by RGtkGen from GTK+ documentation
References
http://www.cairographics.org/manual/cairo-Image-Surfaces.html
[Package
RGtk2 version 2.12.5-3
Index]