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diff --git a/libglitter_colour_model_convert_rasters_double.3 b/libglitter_colour_model_convert_rasters_double.3 new file mode 100644 index 0000000..329b638 --- /dev/null +++ b/libglitter_colour_model_convert_rasters_double.3 @@ -0,0 +1,150 @@ +.TH LIBGLITTER_COLOUR_MODEL_CONVERT_RASTERS_* 3 LIBGLITTER +.SH NAME +LIBGLITTER_COLOUR_MODEL_CONVERT_RASTERS_* - Change colour model used for a set of corasters +.SH SYNOPSIS +.LP +.nf +#include <libglitter.h> + +void libglitter_colour_model_convert_rasters_double(size_t \fIn\fP, size_t \fIm\fP, double *\fIoutputs\fP[m], + const double *\fIinputs\fP[n], size_t \fIoutput_rowsize\fP, + size_t \fIoutput_cellsize\fP, size_t \fIinput_rowsize\fP, + size_t \fIinput_cellsize\fP, size_t \fIwidth\fP, + size_t \fIheight\fP, const double \fImatrix\fP[m][n]); + +void libglitter_colour_model_convert_rasters_float(size_t \fIn\fP, size_t \fIm\fP, float *\fIoutputs\fP[m], + const float *\fIinputs\fP[n], size_t \fIoutput_rowsize\fP, + size_t \fIoutput_cellsize\fP, size_t \fIinput_rowsize\fP, + size_t \fIinput_cellsize\fP, size_t \fIwidth\fP, + size_t \fIheight\fP, const float \fImatrix\fP[m][n]); +.fi +.PP +Link with +.IR "-lglitter -lm" . +.SH DESCRIPTION +The +.BR libglitter_colour_model_convert_rasters_double () +and +.BR libglitter_colour_model_convert_rasters_float () +functions convert a set of rasters (one per source +colour channel) into another set of rasters (one per +target colour channel) using a different colour model. +This is useful for application that cannot output +directly in the output's colour model. +.PP +.I n +shall be the number of source colour channels +(input rasters), and +.I m +shall be the number of target colour channels +(output rasters). +.PP +.I outputs +shall be the list of output rasters: it is to its elements +that the function will write. Note that the rasters shall +already be allocated. Additionally, the function may offset +the input pointers in this list during execution. Therefore, +the contents of this list shall be considered undefined +immediately when the function is called, and may not be +modified before the function terminates. The application +must therefore have the pointers to these rasters saved +elsewhere. The order the rasters shall have in the list +.I outputs +is determined how the colour model conversion matrix +.RI ( matrix ) +was constructed: if it was created using the +.BR libglitter_colour_model_convert_rasters_double (3), +function, or the +.BR libglitter_colour_model_convert_rasters_float (3), +function, the order shall be (0) red, (1) green, (2) blue +or (0) X, (1) Y, (2) Z. +.PP +.I inputs +shall be the list of input rasters: it is from its elements +that the function will read. The function may offset the +input pointers in this list during execution. Therefore, +the contents of this list shall be considered undefined +immediately when the function is called, and may not be +modified before the function terminates. The application +must therefore have the pointers to these rasters saved +elsewhere. The order the rasters shall have in the list +.I inputs +is determined how the colour model conversion matrix +.RI ( matrix ) +was constructed: if it was created using the +.BR libglitter_colour_model_convert_rasters_double (3), +function, or the +.BR libglitter_colour_model_convert_rasters_float (3), +function, the order shall the order the output's primary +colours' chromas hade in the function's argument list. +.PP +.I output_cellsize +shall be the number of elements in an output raster the +pointer to the raster must be offset with to get to a +pointer to the next cell in the raster. +.PP +.I output_rowsize +shall be the number of cells (not elements; but rather the +number of elements divided by +.IR output_cellsize ) +in an output raster the pointer to the raster must be +offset with to get a pointer to the next row but the +same column in the raster +.PP +.I input_cellsize +shall be the number of elements in an input raster the +pointer to the raster must be offset with to get to a +pointer to the next cell in the raster. +.PP +.I input_rowsize +shall be the number of cells (not elements; but rather the +number of elements divided by +.IR input_cellsize ) +in an input raster the pointer to the raster must be +offset with to get a pointer to the next row but the +same column in the raster +.PP +.I width +and +.I height +shall describe the affected area in the rasters. +.I width +shall be the number of pixels the rasters have +horizontally, and +.I height +shall be the number of pixels the rasters have +vertically. +.PP +.I matrix +shall be column-major conversion matrix from the source +colour model (the output's colour model) to the target +colour model (the application's colour model). +.PP +All rasters are in row-major order and must be distinct. +.PP +By default, these functions do not use hardware acceleration, +they run on the CPU. However the +.BR libglitter_enable_acceleration (3) +may be able to enable hardware acceleration for these +functions. It will require at least the following bits in +its first argument to enable hardware acceleration: +.RS +.TP +.I LIBGLITTER_FEATURE_COLOUR_MODEL | LIBGLITTER_FEATURE_DOUBLE_TYPE +for +.BR libglitter_colour_model_convert_rasters_double () +or +.TP +.I LIBGLITTER_FEATURE_COLOUR_MODEL | LIBGLITTER_FEATURE_FLOAT_TYPE +for +.BR libglitter_colour_model_convert_rasters_float (). +.RE +.SH RETURN VALUES +None. +.SH ERRORS +None. +.SH SEE ALSO +.BR libglitter (7), +.BR libglitter_colour_model_convert_rasters_double (3), +.BR libglitter_compose_double (3), +.BR libglitter_desaturate_double (3) |