/* See LICENSE file for copyright and license details. */ #ifndef LIBGLITTER_H #define LIBGLITTER_H #include #include /** * The CIE xyY values of the D65 illuminant */ #define LIBGLITTER_ILLUMINANT_D65\ 0.312726871026564878786047074755,\ 0.329023206641284038376227272238, 1.0\ /** * Rendering context for an input raster's specifications * * Render context's are thread-safe, however updating them are not */ typedef struct libglitter_render_context LIBGLITTER_RENDER_CONTEXT; /** * Create a render context for an input raster's specifications * * Render context's are thread-safe * * @param noutputs The number of output buffers * @param rowsize The number of cells per row in the input raster * @param widthmul The horizontal number of cells per pixel in the input raster * @param heightmul The vertical number of cells per pixel in the input raster * @param cellmap Subpixel map of size `heightmul * widthmul` that maps a * cell for a pixel in the input raster to an output raster * (the output raster's index); this is row-major map, and * each valid value must appear at least once * @param ncellvalues For each `i` in [0, `noutputs`), `ncellvalues[i]` * shall be the number of times the value `i` occurs * in `cellmap` * @return A render context that can be deallocate using * `libglitter_free_render_context` or updated with * `libglitter_update_render_context`; `NULL` on failure * * @throws ENOMEM Couldn't not allocate enough memory * * If `noutputs` is 3 and either `widthmul` or `heightmul` is 3 and * the other one is 1, `ncellvalues` will not be used as it is preknown * that all its values are 1 */ LIBGLITTER_RENDER_CONTEXT *libglitter_create_render_context(size_t, size_t, size_t, size_t, const uint8_t *, const uint8_t *); /** * Update a render context (created by `libglitter_create_render_context`) * for a new input raster buffer * * Updating a render context is not thread-safe * * @param this The render context to refresh * @param rowsize The number of cells per row in the input raster */ void libglitter_update_render_context(LIBGLITTER_RENDER_CONTEXT *, size_t); /** * Deallocates a render context (created by `libglitter_create_render_context`) * * @param this The render context to deallocate */ void libglitter_free_render_context(LIBGLITTER_RENDER_CONTEXT *); /** * Create one raster per monitor colour from a raster of * subpixels (which may be further divided in the raster) * * Note that this function does not regard the colour * model's transfer function: it does not directly give * you appropriate sRGB values * * @param outputs Array of output rasters, one for each subpixel colour. * 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 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 width The horizontal number of pixels in the rasters * @param height The vertical number of pixels in the rasters * @param render_ctx Rendering context created for the input raster's * specification */ void libglitter_compose_double(double **, const double *restrict, size_t, size_t, size_t, size_t, const LIBGLITTER_RENDER_CONTEXT *); /** * This value is identical to `libglitter_compose_double`, * apart from it parameter types, see `libglitter_compose_double` * for details about this function */ void libglitter_compose_float(float **, const float *restrict, size_t, size_t, size_t, size_t, const LIBGLITTER_RENDER_CONTEXT *); /** * Create one raster per monitor colour from a raster of * subpixels (which may be further divided in the raster) * * Note that this function does not regard the colour * model's transfer function: it does not directly give * you appropriate sRGB values * * @param outputs Array of output rasters, one for each subpixel colour. * 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 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 width The horizontal number of pixels in the rasters * @param height The vertical number of pixels in the rasters * @param render_ctx Rendering context created for the input raster's * specification */ void libglitter_compose_uint64(uint64_t **, const uint64_t *restrict, size_t, size_t, size_t, size_t, const LIBGLITTER_RENDER_CONTEXT *); /** * This value is identical to `libglitter_compose_uint64`, * apart from it parameter types, see `libglitter_compose_uint64` * for details about this function */ void libglitter_compose_uint32(uint32_t **, const uint32_t *restrict, size_t, size_t, size_t, size_t, const LIBGLITTER_RENDER_CONTEXT *); /** * This value is identical to `libglitter_compose_uint64`, * apart from it parameter types, see `libglitter_compose_uint64` * for details about this function */ void libglitter_compose_uint16(uint16_t **, const uint16_t *restrict, size_t, size_t, size_t, size_t, const LIBGLITTER_RENDER_CONTEXT *); /** * This value is identical to `libglitter_compose_uint64`, * apart from it parameter types, see `libglitter_compose_uint64` * for details about this function */ void libglitter_compose_uint8(uint8_t **, const uint8_t *restrict, size_t, size_t, size_t, size_t, const LIBGLITTER_RENDER_CONTEXT *); /** * Transform rasters from fully using subpixel rendering to * balance between subpixel rendering and greyscale antialiasing * * @param rasters Array of rasters, one for each subpixel colour. * 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 nrasters The number of rasters * @param rowsize The number of cells in a row in each raster * @param cellsize The number of values stored in each raster, * between each cell, plus 1 (that is, the number of * values per cell) * @param width The horizontal number of pixels in the rasters * @param height The vertical number of pixels in the rasters * @param saturation The subpixel rendering saturation, 1 for regular * subpixel rendering, 0 for greyscale, values * inbetween for a compromise * @param primary_ys The CIE Y value (in e.g. CIE xyY or CIE XYZ) for * each subpixel colour; or `NULL` for the sRGB values * (this is only allowed if there are exactly 3 rasters) */ void libglitter_desaturate_double(double **, size_t, size_t, size_t, size_t, size_t, double, const double *); /** * This value is identical to `libglitter_desaturate_double`, * apart from it parameter types, see `libglitter_desaturate_double` * for details about this function */ void libglitter_desaturate_float(float **, size_t, size_t, size_t, size_t, size_t, float, const float *); /** * Get the matrix each pixel shall be multiplied with * to convert it from the output's colour space to sRGB * * This is useful when the output does not use sRGB, * but the application does * * @param matrix Output buffer for the conversion matrix * @param c1x The CIE x value (as in CIE xyY) of the output's first primary colour * @param c1y The CIE y value (as in CIE xyY) of the output's first primary colour * @param c2x The CIE x value (as in CIE xyY) of the output's second primary colour * @param c2y The CIE y value (as in CIE xyY) of the output's second primary colour * @param c3x The CIE x value (as in CIE xyY) of the output's third primary colour * @param c3y The CIE y value (as in CIE xyY) of the output's third primary colour * @param white_x The CIE x value (as in CIE xyY) of the output's white point * @param white_y The CIE y value (as in CIE xyY) of the output's white point * @param white_Y The CIE Y value (as in CIE xyY) of the output's white point, normally 1 * * `LIBGLITTER_ILLUMINANT_D65` can be input in place of * `white_x, white_y, white_Y` (it expands to three arguments) * if the output's whitepoint is the D65 illuminant */ void libglitter_get_colour_space_conversion_matrix_double(double[3][3], double, double, double, double, double, double, double, double, double); /** * This value is identical to `libglitter_get_colour_space_conversion_matrix_double`, * apart from it parameter types, see `libglitter_get_colour_space_conversion_matrix_double` * for details about this function */ void libglitter_get_colour_space_conversion_matrix_float(float[3][3], float, float, float, float, float, float, float, float, float); #endif