LQR_RWINDOW_READ(3) LqR library API reference LQR_RWINDOW_READ(3)NAME
lqr_rwindow_read - read the content of a LqrReadingWindow object
SYNOPSIS
#include <lqr.h>
gfloat lqr_rwindow_read(LqrReadingWindow* rwindow, gint x, gint y, gint channel);
DESCRIPTION
The function lqr_rwindow_read returns the content of the reading window rwindow at point x, y and at channel channel.
The coordinates x and y are relative to the rwindow centre, and they both can range from -radius to radius (extremes included), where
radius can be obtained with the function lqr_rwindow_get_radius(3).
The function returns 0 when the coordinates are out of range, either because they are beyond the rwindow radius or because they are outside
the image boundary.
The channel parameter specifies which channel to read out; depending on the rwindow reader type, the range and meaning of this parameter
changes: for the cases LQR_ER_BRIGHTNESS and LQR_ER_LUMA it must be 0, because the readout consists of a single channel, for LQR_ER_RGBA it
must be between 0 and 3 (and then the readout will contain the RGBA information), while for LQR_ER_CUSTOM it must be one of the original
image channels.
SEE ALSO lqr_carver_set_energy_function(3), lqr_rwindow_get_read_t(3), lqr_rwindow_get_radius(3), lqr_rwindow_get_channels(3)COPYRIGHT
Copyright (C) 2007-2009 Carlo Baldassi
LqR library 0.4.1 API (3:1:3) 10 Maj 2009 LQR_RWINDOW_READ(3)
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LQR_CARVER_NEW(3) LqR library API reference LQR_CARVER_NEW(3)NAME
lqr_carver_new, lqr_carver_new_ext - the LqrCarver object constructors
SYNOPSIS
#include <lqr.h>
LqrCarver* lqr_carver_new(guchar* buffer, gint width, gint height, gint channels);
LqrCarver* lqr_carver_new_ext(void* buffer, gint width, gint height, gint channels, LqrColDepth colour_depth);
DESCRIPTION
The functions lqr_carver_new and lqr_carver_new_ext create a new LqrCarver object from an image of size width * height with channels colour
channels.
The image must be stored in buffer as a plain array of unsigned chars (for lqr_carver_new) or the appropriate type cast to void (for
lqr_carver_new_ext), ordered by row, then by column, then by colour channel.
In the extended constructor lqr_carver_new_ext, the additional parameter colour_depth is required to specify the colour depth of the buffer
(see LqrColDepth(3) for more information).
After calling the function, the buffer will be owned by the LqrCarver object and must not be accessed any more, unless you subsequently
call the lqr_carver_set_preserve_input_image(3) function.
The image type is et automatically from the value of channels according to this table:
Table 3.1. Image types assigned by default
+---------+------------------+
|channels | type |
+---------+------------------+
|1 | LQR_GREY_IMAGE |
+---------+------------------+
|2 | LQR_GREYA_IMAGE |
+---------+------------------+
|3 | LQR_RGB_IMAGE |
+---------+------------------+
|4 | LQR_RGBA_IMAGE |
+---------+------------------+
|5 | LQR_CMYKA_IMAGE |
+---------+------------------+
|>5 | LQR_CUSTOM_IMAGE |
+---------+------------------+
RETURN VALUE
The return value is the address of the newly created LqrCarver object, or NULL in case of failure (insufficient memory).
SEE ALSO LqrColDepth(3), LqrImageType(3), lqr_carver_destroy(3), lqr_carver_init(3), lqr_carver_set_preserve_input_image(3)COPYRIGHT
Copyright (C) 2007-2009 Carlo Baldassi
LqR library 0.4.1 API (3:1:3) 10 Maj 2009 LQR_CARVER_NEW(3)
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