fiasco(3) Fractal Image And Sequence COdec fiasco(3)NAME
fiasco_renderer_new, fiasco_renderer_delete - convert a FIASCO image
object to an X11 XImage
SYNOPSIS
#include <fiasco.h>
fiasco_renderer_t *
fiasco_renderer_new (unsigned long red_mask,
unsigned long green_mask,
unsigned long blue_mask,
unsigned bpp,
int double_resolution);
void
fiasco_renderer_delete (fiasco_renderer_t * renderer);
int
fiasco_renderer_render (const fiasco_renderer_t * renderer,
unsigned char * data);
const fiasco_image_t * fiasco_image);
DESCRIPTION
The fiasco_renderer_new() function allocates and initializes a renderer
object which has to be used to convert an internal FIASCO image object
to one of the supported X11 formats. Currently, the FIASCO image can be
rendered to an X11 XImage of either 16, 24, or 32 bits per pixel. Addi‐
tional formats will be supported upon request.
Function fiasco_renderer_render() is used to convert the given FIASCO
image object to the specified format.
After all frames are rendered, the function fiasco_renderer_delete()
should be called to free temporarily allocated memory and to discard
the renderer object.
Note that the FIASCO renderer class is not restricted to X11 images: a
FIASCO image object can be converted to an image data array of the form
RGBRGB... by setting red_mask=0xff0000, green_mask=0xff00,
blue_mask=0xff, and bpp=24.
ARGUMENTS
bpp Determines the number of bits of a single pixel of the X11 XIm‐
age structure (see XCreateImage(3)). If the XImage is already
allocated then the value XImage->bits_per_pixel should be used.
Currently, 16, 24, and 32 bits per pixel are supported.
red_mask
Determines which bits of a pixel should be used for the red com‐
ponent. If the XImage is already allocated then the value XIm‐
age->red_mask should be used. E.g., if bpp=16 and
red_mask=0xf800 then each pixel is stored with two bytes. The
red component uses bits 11-15, the remaining green and blue com‐
ponents use bits 0-10.
green_mask
Determines which bits of a pixel should be used for the green
component. If the XImage is already allocated then the value
XImage->green_mask should be used.
blue_mask
Determines which bits of a pixel should be used for the blue
component. If the XImage is already allocated then the value
XImage->blue_mask should be used.
data A pointer to the image data. If the XImage is already allocated
then the value XImage->data should be used. This array has to be
large enough to hold the decoded image at the given size (geome‐
try and bits per pixel).
fiasco_image
This object represents the decoded image which has been created
by the FIASCO functions fiasco_decoder_get_frame(3) or
fiasco_image_new(3).
RETURN VALUE
The function fiasco_renderer_new() returns a pointer to the newly allo‐
cated renderer object. If an error has been catched, a NULL pointer is
returned.
The function fiasco_renderer_render() returns 1 if the image has been
successfully converted. Otherwise, the function returns 0.
In case of an error in one of the above functions, use the function
fiasco_get_error_message(3) to get a string with the last error message
of FIASCO.
SEE ALSOfiasco_decoder_get_frame(3), fiasco_get_error_message(3)fiasco_image_new(3)
Ullrich Hafner, Juergen Albert, Stefan Frank, and Michael Unger.
Weighted Finite Automata for Video Compression, IEEE Journal on
Selected Areas In Communications, January 1998
Ullrich Hafner. Low Bit-Rate Image and Video Coding with Weighted
Finite Automata, Ph.D. thesis, Mensch & Buch Verlag, ISBN
3-89820-002-7, October 1999.
AUTHOR
Ullrich Hafner <hafner@bigfoot.de>
FIASCO April, 2000 fiasco(3)
