caca_frame(3caca) libcaca caca_frame(3caca)
NAME
caca_frame - libcaca canvas frame handling
SYNOPSIS
Modules
libcaca bitmap dithering
Functions
__extern int caca_get_frame_count (caca_canvas_t const *)
Get the number of frames in a canvas.
__extern int caca_set_frame (caca_canvas_t *, int)
Activate a given canvas frame.
__extern char const * caca_get_frame_name (caca_canvas_t const *)
Get the current frame's name.
__extern int caca_set_frame_name (caca_canvas_t *, char const *)
Set the current frame's name.
__extern int caca_create_frame (caca_canvas_t *, int)
Add a frame to a canvas.
__extern int caca_free_frame (caca_canvas_t *, int)
Remove a frame from a canvas.
Detailed Description
These functions provide high level routines for canvas frame insertion,
removal, copying etc.
Function Documentation
__extern int caca_get_frame_count (caca_canvas_t const * cv)
Return the current canvas' frame count.
This function never fails.
Parameters
cv A libcaca canvas
Returns
The frame count
Referenced by caca_set_canvas_boundaries().
__extern int caca_set_frame (caca_canvas_t * cv, int id)
Set the active canvas frame. All subsequent drawing operations will be
performed on that frame. The current painting context set by
caca_set_attr() is inherited.
If the frame index is outside the canvas' frame range, nothing happens.
If an error occurs, -1 is returned and errno is set accordingly:
• EINVAL Requested frame is out of range.
Parameters
cv A libcaca canvas
id The canvas frame to activate
Returns
0 in case of success, -1 if an error occurred.
References caca_add_dirty_rect().
Referenced by caca_set_canvas_boundaries().
__extern char const* caca_get_frame_name (caca_canvas_t const * cv)
Return the current frame's name. The returned string is valid until the
frame is deleted or caca_set_frame_name() is called to change the frame
name again.
This function never fails.
Parameters
cv A libcaca canvas.
Returns
The current frame's name.
__extern int caca_set_frame_name (caca_canvas_t * cv, char const * name)
Set the current frame's name. Upon creation, a frame has a default name
of 'frame#xxxxxxxx' where xxxxxxxx is a self-incrementing hexadecimal
number.
If an error occurs, -1 is returned and errno is set accordingly:
• ENOMEM Not enough memory to allocate new frame.
Parameters
cv A libcaca canvas.
name The name to give to the current frame.
Returns
0 in case of success, -1 if an error occurred.
__extern int caca_create_frame (caca_canvas_t * cv, int id)
Create a new frame within the given canvas. Its contents and attributes
are copied from the currently active frame.
The frame index indicates where the frame should be inserted. Valid
values range from 0 to the current canvas frame count. If the frame
index is greater than or equals the current canvas frame count, the new
frame is appended at the end of the canvas. If the frame index is less
than zero, the new frame is inserted at index 0.
The active frame does not change, but its index may be renumbered due
to the insertion.
If an error occurs, -1 is returned and errno is set accordingly:
• ENOMEM Not enough memory to allocate new frame.
Parameters
cv A libcaca canvas
id The index where to insert the new frame
Returns
0 in case of success, -1 if an error occurred.
Referenced by caca_set_canvas_boundaries().
__extern int caca_free_frame (caca_canvas_t * cv, int id)
Delete a frame from a given canvas.
The frame index indicates the frame to delete. Valid values range from
0 to the current canvas frame count minus 1. If the frame index is
greater than or equals the current canvas frame count, the last frame
is deleted.
If the active frame is deleted, frame 0 becomes the new active frame.
Otherwise, the active frame does not change, but its index may be
renumbered due to the deletion.
If an error occurs, -1 is returned and errno is set accordingly:
• EINVAL Requested frame is out of range, or attempt to delete the last
frame of the canvas.
Parameters
cv A libcaca canvas
id The index of the frame to delete
Returns
0 in case of success, -1 if an error occurred.
References caca_add_dirty_rect().
Author
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Version 0.99.beta20 Tue Jul 12 2022 caca_frame(3caca)
Generated by dwww version 1.15 on Wed Jun 26 18:07:57 CEST 2024.