caca_rotate_180(3)

libcaca canvas transformation(3caca)libcaclibcaca canvas transformation(3caca)



NAME
       libcaca canvas transformation -

   Functions
       __extern int caca_invert (caca_canvas_t *)
           Invert a canvas' colours.
       __extern int caca_flip (caca_canvas_t *)
           Flip a canvas horizontally.
       __extern int caca_flop (caca_canvas_t *)
           Flip a canvas vertically.
       __extern int caca_rotate_180 (caca_canvas_t *)
           Rotate a canvas.
       __extern int caca_rotate_left (caca_canvas_t *)
           Rotate a canvas, 90 degrees counterclockwise.
       __extern int caca_rotate_right (caca_canvas_t *)
           Rotate a canvas, 90 degrees counterclockwise.
       __extern int caca_stretch_left (caca_canvas_t *)
           Rotate and stretch a canvas, 90 degrees counterclockwise.
       __extern int caca_stretch_right (caca_canvas_t *)
           Rotate and stretch a canvas, 90 degrees clockwise.

Detailed Description
       These functions perform horizontal and vertical canvas flipping.

Function Documentation
   __extern int caca_invert (caca_canvas_t * cv) Invert a canvas' colours
       (black becomes white, red becomes cyan, etc.) without changing the
       characters in it.
       This function never fails.

       Parameters:
           cv The canvas to invert.

       Returns:
           This function always returns 0.

   __extern int caca_flip (caca_canvas_t * cv) Flip a canvas horizontally,
       choosing characters that look like the mirrored version wherever
       possible. Some characters will stay unchanged by the process, but the
       operation is guaranteed to be involutive: performing it again gives
       back the original canvas.
       This function never fails.

       Parameters:
           cv The canvas to flip.

       Returns:
           This function always returns 0.

       References CACA_MAGIC_FULLWIDTH.

   __extern int caca_flop (caca_canvas_t * cv) Flip a canvas vertically,
       choosing characters that look like the mirrored version wherever
       possible. Some characters will stay unchanged by the process, but the
       operation is guaranteed to be involutive: performing it again gives
       back the original canvas.
       This function never fails.

       Parameters:
           cv The canvas to flop.

       Returns:
           This function always returns 0.

   __extern int caca_rotate_180 (caca_canvas_t * cv) Apply a 180-degree
       transformation to a canvas, choosing characters that look like the
       upside-down version wherever possible. Some characters will stay
       unchanged by the process, but the operation is guaranteed to be
       involutive: performing it again gives back the original canvas.
       This function never fails.

       Parameters:
           cv The canvas to rotate.

       Returns:
           This function always returns 0.

       References CACA_MAGIC_FULLWIDTH.

   __extern int caca_rotate_left (caca_canvas_t * cv) Apply a 90-degree
       transformation to a canvas, choosing characters that look like the
       rotated version wherever possible. Characters cells are rotated two-by-
       two. Some characters will stay unchanged by the process, some others
       will be replaced by close equivalents. Fullwidth characters at odd
       horizontal coordinates will be lost. The operation is not guaranteed to
       be reversible at all.
       Note that the width of the canvas is divided by two and becomes the new
       height. Height is multiplied by two and becomes the new width. If the
       original width is an odd number, the division is rounded up.

       If an error occurs, -1 is returned and errno is set accordingly:

       · EBUSY The canvas is in use by a display driver and cannot be rotated.

       · ENOMEM Not enough memory to allocate the new canvas size. If this
         happens, the previous canvas handle is still valid.

       Parameters:
           cv The canvas to rotate left.

       Returns:
           0 in case of success, -1 if an error occurred.

   __extern int caca_rotate_right (caca_canvas_t * cv) Apply a 90-degree
       transformation to a canvas, choosing characters that look like the
       rotated version wherever possible. Characters cells are rotated two-by-
       two. Some characters will stay unchanged by the process, some others
       will be replaced by close equivalents. Fullwidth characters at odd
       horizontal coordinates will be lost. The operation is not guaranteed to
       be reversible at all.
       Note that the width of the canvas is divided by two and becomes the new
       height. Height is multiplied by two and becomes the new width. If the
       original width is an odd number, the division is rounded up.

       If an error occurs, -1 is returned and errno is set accordingly:

       · EBUSY The canvas is in use by a display driver and cannot be rotated.

       · ENOMEM Not enough memory to allocate the new canvas size. If this
         happens, the previous canvas handle is still valid.

       Parameters:
           cv The canvas to rotate right.

       Returns:
           0 in case of success, -1 if an error occurred.

   __extern int caca_stretch_left (caca_canvas_t * cv) Apply a 90-degree
       transformation to a canvas, choosing characters that look like the
       rotated version wherever possible. Some characters will stay unchanged
       by the process, some others will be replaced by close equivalents.
       Fullwidth characters will be lost. The operation is not guaranteed to
       be reversible at all.
       Note that the width and height of the canvas are swapped, causing its
       aspect ratio to look stretched.

       If an error occurs, -1 is returned and errno is set accordingly:

       · EBUSY The canvas is in use by a display driver and cannot be rotated.

       · ENOMEM Not enough memory to allocate the new canvas size. If this
         happens, the previous canvas handle is still valid.

       Parameters:
           cv The canvas to rotate left.

       Returns:
           0 in case of success, -1 if an error occurred.

   __extern int caca_stretch_right (caca_canvas_t * cv) Apply a 270-degree
       transformation to a canvas, choosing characters that look like the
       rotated version wherever possible. Some characters will stay unchanged
       by the process, some others will be replaced by close equivalents.
       Fullwidth characters will be lost. The operation is not guaranteed to
       be reversible at all.
       Note that the width and height of the canvas are swapped, causing its
       aspect ratio to look stretched.

       If an error occurs, -1 is returned and errno is set accordingly:

       · EBUSY The canvas is in use by a display driver and cannot be rotated.

       · ENOMEM Not enough memory to allocate the new canvas size. If this
         happens, the previous canvas handle is still valid.

       Parameters:
           cv The canvas to rotate right.

       Returns:
           0 in case of success, -1 if an error occurred.

Author
       Generated automatically by Doxygen for libcaca from the source code.



Version 0.99.beta16               5 Jan 20libcaca canvas transformation(3caca)