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| -rw-r--r-- | libglitter.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/libglitter.h b/libglitter.h new file mode 100644 index 0000000..6fc227d --- /dev/null +++ b/libglitter.h @@ -0,0 +1,95 @@ +/* See LICENSE file for copyright and license details. */ +#ifndef LIBGLITTER_H +#define LIBGLITTER_H + +#include <stddef.h> +#include <stdint.h> + + +/** + * Create one raster per monitor colour from a raster of + * subpixels (which may be further divided in the raster) + * + * @param outputs Array of output rasters, on for each subpixel colour; + * each raster must be initialised to have the value 0 + * in each cell. The function may change the offset for + * each raster, as such, the given pointer shall not be + * used anywhere else during the execution of the function + * and the inner pointers shall be considered undefined + * after the execution of the function + * @param noutputs The number of output buffers + * @param input Input raster; cells are adjacent + * @param output_rowsize The number of cells in a row in each output raster + * @param output_cellsize The number of values stored in each output raster, + * between each cell, plus 1 (that is, the number of + * values per cell) + * @param input_rowsize The number of cells in a row in `input` + * @param width The horizontal number of pixels in the rasters + * @param height The vertical number of pixels in the rasters + * @param widthmul The horizontal number of cells per pixel in `input` + * @param heightmul The vertical number of cells per pixel in `input` + * @param cellmap Subpixel map of size `heightmul * widthmul` that + * maps a cell for a pixel in `input` to an output + * raster (the value of the cell is the output's index + * in `outputs`); this is row-major map, and each valid + * value must appear at least once + * @param ncellweights For each `i` in [0, `noutputs`), `ncellvalues[i]` + * shall have the value `1. / x`, where `x` is the + * number of times the value `i` occurs in `cellmap` + * + * The initialisation requirement on the buffers in `outputs` + * does not apply if `noutputs` is 3 and either `widthmul` or + * `heightmul` is 3 and the other one is 1; additionally, in + * this case `ncellweights` will not be used as it is preknown + * that all it's values are 1 + */ +void libglitter_compose_double(double **, size_t, const double *restrict, + size_t, size_t, size_t, size_t, size_t, size_t, size_t, + const uint8_t *restrict, const double *restrict); + +/** + * Create one raster per monitor colour from a raster of + * subpixels (which may be further divided in the raster) + * + * @param outputs Array of output rasters, on for each subpixel colour; + * each raster must be initialised to have the value 0 + * in each cell. The function may change the offset for + * each raster, as such, the given pointer shall not be + * used anywhere else during the execution of the function + * and the inner pointers shall be considered undefined + * after the execution of the function + * @param noutputs The number of output buffers + * @param input Input raster; cells are adjacent + * @param output_rowsize The number of cells in a row in each output raster + * @param output_cellsize The number of values stored in each output raster, + * between each cell, plus 1 (that is, the number of + * values per cell) + * @param input_rowsize The number of cells in a row in `input` + * @param width The horizontal number of pixels in the rasters + * @param height The vertical number of pixels in the rasters + * @param widthmul The horizontal number of cells per pixel in `input` + * @param heightmul The vertical number of cells per pixel in `input` + * @param cellmap Subpixel map of size `heightmul * widthmul` that + * maps a cell for a pixel in `input` to an output + * raster (the value of the cell is the output's index + * in `outputs`); this is row-major map, and each valid + * value must appear at least once + * @param ncellweights For each `i` in [0, `noutputs`), `ncellvalues[i]` + * shall have the value `1. / x`, where `x` is the + * number of times the value `i` occurs in `cellmap` + * + * The initialisation requirement on the buffers in `outputs` + * does not apply if `noutputs` is 3 and either `widthmul` or + * `heightmul` is 3 and the other one is 1; additionally, in + * this case `ncellweights` will not be used as it is preknown + * that all it's values are 1 + */ +void libglitter_compose_float(float **, size_t, const float *restrict, + size_t, size_t, size_t, size_t, size_t, size_t, size_t, + const uint8_t *restrict, const float *restrict); + +/* TODO add integer versions */ +/* TODO add colour space conversion and saturation */ + + +#endif |