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| author | Mattias Andrée <maandree@kth.se> | 2023-01-25 22:59:01 +0100 |
|---|---|---|
| committer | Mattias Andrée <maandree@kth.se> | 2023-01-25 22:59:01 +0100 |
| commit | cd1558586a3ea5ac019b39831a135c2d488e405b (patch) | |
| tree | b73e7dfcfb107e850e536025f2c45223e0c8d6f6 | |
| parent | Improve README (diff) | |
| download | libglitter-cd1558586a3ea5ac019b39831a135c2d488e405b.tar.gz libglitter-cd1558586a3ea5ac019b39831a135c2d488e405b.tar.bz2 libglitter-cd1558586a3ea5ac019b39831a135c2d488e405b.tar.xz | |
Add man pages + some minor fixes
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat (limited to '')
32 files changed, 1181 insertions, 81 deletions
@@ -17,8 +17,8 @@ LIB_NAME = glitter OBJ =\ - libglitter_colour_space_convert_rasters_double.o\ - libglitter_colour_space_convert_rasters_float.o\ + libglitter_colour_model_convert_rasters_double.o\ + libglitter_colour_model_convert_rasters_float.o\ libglitter_compose_double.o\ libglitter_compose_float.o\ libglitter_compose_uint16.o\ @@ -30,8 +30,8 @@ OBJ =\ libglitter_desaturate_float.o\ libglitter_create_render_context.o\ libglitter_free_render_context.o\ - libglitter_get_colour_space_conversion_matrix_double.o\ - libglitter_get_colour_space_conversion_matrix_float.o\ + libglitter_get_colour_model_conversion_matrix_double.o\ + libglitter_get_colour_model_conversion_matrix_float.o\ libglitter_per_channel_desaturate_double.o\ libglitter_per_channel_desaturate_float.o\ libglitter_reorder_rasters.o\ @@ -43,6 +43,9 @@ HDR =\ common.h\ libglitter.h +MAN3 = $(OBJ:.o=.3) +MAN7 = libglitter.7 + LOBJ = $(OBJ:.o=.lo) TESTS = $(OBJ:.o=.test) @@ -89,6 +92,10 @@ install: libglitter.a libglitter.$(LIBEXT) ln -sf -- libglitter.$(LIBMINOREXT) "$(DESTDIR)$(PREFIX)/lib/libglitter.$(LIBMAJOREXT)" ln -sf -- libglitter.$(LIBMAJOREXT) "$(DESTDIR)$(PREFIX)/lib/libglitter.$(LIBEXT)" cp -- libglitter.h "$(DESTDIR)$(PREFIX)/include/" + mkdir -- "$(DESTDIR)$(MANPREFIX)/man3" + mkdir -- "$(DESTDIR)$(MANPREFIX)/man7" + cp -P -- $(MAN3) "$(DESTDIR)$(MANPREFIX)/man3/" + cp -P -- $(MAN7) "$(DESTDIR)$(MANPREFIX)/man7/" uninstall: -rm -f -- "$(DESTDIR)$(PREFIX)/lib/libglitter.a" @@ -96,6 +103,8 @@ uninstall: -rm -f -- "$(DESTDIR)$(PREFIX)/lib/libglitter.$(LIBMINOREXT)" -rm -f -- "$(DESTDIR)$(PREFIX)/lib/libglitter.$(LIBEXT)" -rm -f -- "$(DESTDIR)$(PREFIX)/include/libglitter.h" + -cd -- "$(DESTDIR)$(MANPREFIX)/man3" && rm -f -- $(MAN3) + -cd -- "$(DESTDIR)$(MANPREFIX)/man7" && rm -f -- $(MAN7) clean: -rm -f -- *.o *.a *.lo *.su *.so *.so.* *.dll *.dylib *.test @@ -39,15 +39,15 @@ DESCRIPTION float(3). Then, if the application cannot output directly to the - output's colour space, the application can use - libglitter_get_colour_space_conversion_matrix_double(3) - and libglitter_colour_space_convert_rasters_double(3) or - libglitter_get_colour_space_conversion_matrix_float(3) - and libglitter_colour_space_convert_rasters_float(3) to - convert a colour space the application can output in. It is + output's colour model, the application can use + libglitter_get_colour_model_conversion_matrix_double(3) + and libglitter_colour_model_convert_rasters_double(3) or + libglitter_get_colour_model_conversion_matrix_float(3) + and libglitter_colour_model_convert_rasters_float(3) to + convert a colour model the application can output in. It is however out of the scope of libglitter to get the output's - colour space and the conversion matrix to any other colour - space than sRGB or CIE XYZ. + colour model and the conversion matrix to any other colour + model than sRGB or CIE XYZ. The finally step of the rendering process is out of scope for libglitter, but is to ensure that all floating-point values @@ -1 +0,0 @@ -Add man pages diff --git a/libglitter.7 b/libglitter.7 new file mode 100644 index 0000000..a446eeb --- /dev/null +++ b/libglitter.7 @@ -0,0 +1,89 @@ +.TH LIBGLITTER 7 LIBGLITTER +.SH NAME +libglitter - Subpixel-rendering library +.SH DESCRIPTION +.B libglitter +is a C library for subpixel-rendered text from an +greyscale-antialiased text image. +.B libglitter +is designed to be +used in conjunction with other font libraries: it can neither +rasterise glyphs nor does it know about the montor's subpixel +layout or rendering configurations. +.PP +To use +.B libglitter +you first apply hinting to the text so that +the glyph outlines aligns with the output's pixel-grid as +closely as possible. The next step is to get the output's +subpixel arrangement and scaling factor, then assuming that +the output's subpixel arrangement is subpixel-rendering +compatible and that its native resolution is used, you +rasterise the text using greyscale-antialiasing into a raster +sized according to the output's horizontal and vertical +subpixel densities (rather than pixel densities as normally +done with greyscale-antialiasing; some subpixels may have be +counted multiple times depending on the subpixel arrangement). +After this you create an uninitialised colour raster for text +and the output's pixel density, and split it into one raster +per colour channel using +.BR libglitter_split_uint64_raster (3) +or +.BR libglitter_split_uint32_raster (3), +this is when +.B libglitter +is first used in this process; alternatively you create one +raster for each colour channel directly. Then you use +.BR libglitter_compose_double (3), +.BR libglitter_compose_float (3), +.BR libglitter_compose_uint64 (3), +.BR libglitter_compose_uint32 (3), +.BR libglitter_compose_uint16 (3), +or +.BR libglitter_compose_uint8 (3) +to create the subpixel-antialiased image of the text; you may +have to first call +.BR libglitter_reorder_rasters (3) +to put the rasters in the expected order. +.PP +An optional next step is to use lessen the intensity of the +subpixel-antialiasing with +.BR libglitter_desaturate_double (3), +.BR libglitter_desaturate_float (3), +.BR libglitter_per_channel_desaturate_double (3), +or +.BR libglitter_per_channel_desaturate_float (3). +.PP +Then, if the application cannot output directly to the +output's colour model, the application can use +.BR libglitter_get_colour_model_conversion_matrix_double (3) +and +.BR libglitter_colour_model_convert_rasters_double (3) +or +.BR libglitter_get_colour_model_conversion_matrix_float (3) +and +.BR libglitter_colour_model_convert_rasters_float (3) +to convert a colour model the application can output in. It is +however out of the scope of +.B libglitter +to get the output's +colour model and the conversion matrix to any other colour +model than sRGB or CIE XYZ. +.PP +The finally step of the rendering process is out of scope for +.BR libglitter , +but is to ensure that all floating-point values +(if floating-point rasters are used) are withing [0, 1] and +convert the rasters, which only contain ink-on intensities, +into the desired colour's with the output's transfer function +applied. +.PP +The application may also desire to call +.BR libglitter_enable_acceleration (3) +at the beginning of its execution to enable +any implemented and supported hardware acceleration. This +may however be an expensive process, and may not be +desirable for all applications. +.PP +.SH SEE ALSO +.BR libfonts (7) diff --git a/libglitter.h b/libglitter.h index 0bc65b1..9b2f30f 100644 --- a/libglitter.h +++ b/libglitter.h @@ -9,32 +9,32 @@ /** * The application will use `double`-typed rasters */ -#define LIBGLITTER_FEATURE_DOUBLE_TYPE UINT64_C(0x0000000000000001) +#define LIBGLITTER_FEATURE_DOUBLE_TYPE UINT64_C(0x0000000000000001) /** * The application will use `float`-typed rasters */ -#define LIBGLITTER_FEATURE_FLOAT_TYPE UINT64_C(0x0000000000000002) +#define LIBGLITTER_FEATURE_FLOAT_TYPE UINT64_C(0x0000000000000002) /** * The application will use `uint64_t`-typed rasters */ -#define LIBGLITTER_FEATURE_UINT64_TYPE UINT64_C(0x0000000000000004) +#define LIBGLITTER_FEATURE_UINT64_TYPE UINT64_C(0x0000000000000004) /** * The application will use `uint32_t`-typed rasters */ -#define LIBGLITTER_FEATURE_UINT32_TYPE UINT64_C(0x0000000000000008) +#define LIBGLITTER_FEATURE_UINT32_TYPE UINT64_C(0x0000000000000008) /** * The application will use `uint16_t`-typed rasters */ -#define LIBGLITTER_FEATURE_UINT16_TYPE UINT64_C(0x0000000000000010) +#define LIBGLITTER_FEATURE_UINT16_TYPE UINT64_C(0x0000000000000010) /** * The application will use `uint8_t`-typed rasters */ -#define LIBGLITTER_FEATURE_UINT8_TYPE UINT64_C(0x0000000000000020) +#define LIBGLITTER_FEATURE_UINT8_TYPE UINT64_C(0x0000000000000020) /** * The allocation will use at least one of the functions @@ -45,21 +45,28 @@ * `libglitter_compose_uint16`, and * `libglitter_compose_uint8` */ -#define LIBGLITTER_FEATURE_COMPOSE UINT64_C(0x0000000000000040) +#define LIBGLITTER_FEATURE_COMPOSE UINT64_C(0x0000000000000040) /** * The allocation will use at least one of the functions * `libglitter_desaturate_double`, and * `libglitter_desaturate_float` */ -#define LIBGLITTER_FEATURE_DESATURATION UINT64_C(0x0000000000000080) +#define LIBGLITTER_FEATURE_CU_DESATURATION UINT64_C(0x0000000000000080) /* CU = channel-uniform */ /** * The allocation will use at least one of the functions - * `libglitter_colour_space_convert_rasters_double`, and - * `libglitter_colour_space_convert_rasters_float` + * `libglitter_per_channel_desaturate_double`, and + * `libglitter_per_channel_desaturate_float` */ -#define LIBGLITTER_FEATURE_COLOUR_SPACE UINT64_C(0x0000000000000100) +#define LIBGLITTER_FEATURE_PC_DESATURATION UINT64_C(0x0000000000000100) /* PC = per channel */ + +/** + * The allocation will use at least one of the functions + * `libglitter_colour_model_convert_rasters_double`, and + * `libglitter_colour_model_convert_rasters_float` + */ +#define LIBGLITTER_FEATURE_COLOUR_MODEL UINT64_C(0x0000000000000200) /** @@ -116,8 +123,9 @@ enum libglitter_colour { * - LIBGLITTER_FEATURE_UINT16_TYPE, * - LIBGLITTER_FEATURE_UINT8_TYPE, * - LIBGLITTER_FEATURE_COMPOSE, - * - LIBGLITTER_FEATURE_DESATURATION, and - * - LIBGLITTER_FEATURE_COLOUR_SPACE. + * - LIBGLITTER_FEATURE_CU_DESATURATION, + * - LIBGLITTER_FEATURE_PC_DESATURATION, and + * - LIBGLITTER_FEATURE_COLOUR_MODEL. * @param async Whether the function shall return immediately * rather than when complete * @param callback Callback function that is called at function @@ -130,11 +138,12 @@ enum libglitter_colour { * also be `NULL` if no callback function shall be * called * @param userdata User-specific data to pass into `callback`, may be `NULL` + * @param unused Reserved for future use, shall be `NULL` * @return 1 on success with hardware acceleration enabled, * 0 on success without hardware acceleration enabled, * or -1 on failure */ -int libglitter_enable_acceleration(uint64_t, int, void (*)(int, int, void *), void *); +int libglitter_enable_acceleration(uint64_t, int, void (*)(int, int, void *), void *, void *); /** @@ -161,7 +170,8 @@ int libglitter_enable_acceleration(uint64_t, int, void (*)(int, int, void *), vo * * 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 + * that all its values are 1; in the future this could also happen for + * other situations where `noutputs == widthmul * heightmul` */ LIBGLITTER_RENDER_CONTEXT *libglitter_create_render_context(size_t, size_t, size_t, size_t, const uint8_t *, const uint8_t *); @@ -400,13 +410,13 @@ void libglitter_per_channel_desaturate_float(float **, size_t, size_t, size_t, s /** * Get the matrix each pixel shall be multiplied with - * to convert it from the output's colour space to sRGB + * to convert it from the output's colour model to sRGB * or CIE XYZ * * This is useful when the output does not use sRGB, or * CIE XYZ, but the application does. If the application - * uses some other colour space, this function can output - * the conversion matrix for the CIE XYZ colour space, + * uses some other colour model, this function can output + * the conversion matrix for the CIE XYZ colour model, * which can that be right-hand multiplied to get the * conversion matrix for some other colour; but be aware * that the output matrix is in column-major order, not @@ -423,25 +433,30 @@ void libglitter_per_channel_desaturate_float(float **, size_t, size_t, size_t, s * @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 * @param xyz Whether the output conversion matrix should be to CIE XYZ rather the sRGB + * @param c1Yp Output parameter for the first primary colour CIE Y value, or `NULL` + * @param c2Yp Output parameter for the second primary colour CIE Y value, or `NULL` + * @param c3Yp Output parameter for the third primary colour CIE Y value, or `NULL` * * `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, int); +void libglitter_get_colour_model_conversion_matrix_double(double[3][3], double, double, double, double, + double, double, double, double, double, int, + 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` + * This value is identical to `libglitter_get_colour_model_conversion_matrix_double`, + * apart from it parameter types, see `libglitter_get_colour_model_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, int); +void libglitter_get_colour_model_conversion_matrix_float(float[3][3], float, float, float, float, + float, float, float, float, float, int, + float *, float *, float *); /** - * Convert set of rasters from one colour space to another + * Convert set of rasters from one colour model to another * * @param n The number of input rasters * @param m The number of output rasters @@ -467,18 +482,19 @@ void libglitter_get_colour_space_conversion_matrix_float(float[3][3], float, flo * values per cell) * @param width The horizontal number of pixels in the rasters * @param height The vertical number of pixels in the rasters - * @param matrix Colour space conversion matrix, in column-major order + * @param matrix Colour model conversion matrix, in column-major order */ -void libglitter_colour_space_convert_rasters_double(size_t n, size_t m, double **, const double **, size_t, - size_t, size_t, size_t, size_t, size_t, const double[n][m]); +void libglitter_colour_model_convert_rasters_double(size_t n, size_t m, double **, const double **, size_t, + size_t, size_t, size_t, size_t, size_t, const double[m][n]); /** - * This value is identical to `libglitter_colour_space_convert_rasters_double`, - * apart from it parameter types, see `libglitter_colour_space_convert_rasters_double` + * This value is identical to `libglitter_colour_model_convert_rasters_double`, + * apart from it parameter types, see `libglitter_colour_model_convert_rasters_double` * for details about this function */ -void libglitter_colour_space_convert_rasters_float(size_t n, size_t m, float **, const float **, size_t, - size_t, size_t, size_t, size_t, size_t, const float[n][m]); +void libglitter_colour_model_convert_rasters_float(size_t n, size_t m, float **, const float **, size_t, + size_t, size_t, size_t, size_t, size_t, const float[m][n]); #endif +/* TODO add `restrict` where appropriate */ 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) diff --git a/libglitter_colour_space_convert_rasters_double.c b/libglitter_colour_model_convert_rasters_double.c index 8fa497e..143cd4e 100644 --- a/libglitter_colour_space_convert_rasters_double.c +++ b/libglitter_colour_model_convert_rasters_double.c @@ -30,7 +30,7 @@ multiply_nn(size_t n, double **outputs, size_t opos, const double **inputs, size static void multiply_nm(size_t n, size_t m, double **outputs /* m */, size_t opos, const double **inputs /* n */, - size_t ipos, const double matrix[n][m], double buffer[n]) + size_t ipos, const double matrix[m][n], double buffer[n]) { size_t i, j; for (j = 0; j < n; j++) @@ -44,9 +44,9 @@ multiply_nm(size_t n, size_t m, double **outputs /* m */, size_t opos, const dou void -libglitter_colour_space_convert_rasters_double(size_t n, size_t m, double **outputs /* m */, const double **inputs /* n */, +libglitter_colour_model_convert_rasters_double(size_t n, size_t m, double **outputs /* m */, const double **inputs /* n */, size_t output_rowsize, size_t output_cellsize, size_t input_rowsize, - size_t input_cellsize, size_t width, size_t height, const double matrix[n][m]) + size_t input_cellsize, size_t width, size_t height, const double matrix[m][n]) { size_t y, x, output_i, input_i, output_blanking, input_blanking; double *buffer; diff --git a/libglitter_colour_model_convert_rasters_float.3 b/libglitter_colour_model_convert_rasters_float.3 new file mode 120000 index 0000000..f8e36a0 --- /dev/null +++ b/libglitter_colour_model_convert_rasters_float.3 @@ -0,0 +1 @@ +libglitter_colour_model_convert_rasters_double.3
\ No newline at end of file diff --git a/libglitter_colour_model_convert_rasters_float.c b/libglitter_colour_model_convert_rasters_float.c new file mode 100644 index 0000000..f12322f --- /dev/null +++ b/libglitter_colour_model_convert_rasters_float.c @@ -0,0 +1,6 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" +#define libglitter_colour_model_convert_rasters_double libglitter_colour_model_convert_rasters_float +#define double float +#define fma fmaf +#include "libglitter_colour_model_convert_rasters_double.c" diff --git a/libglitter_colour_space_convert_rasters_float.c b/libglitter_colour_space_convert_rasters_float.c deleted file mode 100644 index c77835a..0000000 --- a/libglitter_colour_space_convert_rasters_float.c +++ /dev/null @@ -1,6 +0,0 @@ -/* See LICENSE file for copyright and license details. */ -#include "common.h" -#define libglitter_colour_space_convert_rasters_double libglitter_colour_space_convert_rasters_float -#define double float -#define fma fmaf -#include "libglitter_colour_space_convert_rasters_double.c" diff --git a/libglitter_compose_double.3 b/libglitter_compose_double.3 new file mode 100644 index 0000000..36bbf02 --- /dev/null +++ b/libglitter_compose_double.3 @@ -0,0 +1,150 @@ +.TH LIBGLITTER_COMPOSE_* 3 LIBGLITTER +.SH NAME +libglitter_compose_* - Convert a subpixel-resolution raster to multiple pixel-resolution rasters +.SH SYNOPSIS +.LP +.nf +#include <libglitter.h> + +void libglitter_compose_double(double **\fIoutputs\fP, const double *\fIinput\fP, + size_t \fIoutput_rowsize\fP, size_t \fIoutput_cellsize\fP, + size_t \fIwidth\fP, size_t \fIheight\fP, + const LIBGLITTER_RENDER_CONTEXT *\fIrender_ctx\fP); + +void libglitter_compose_float(float **\fIoutputs\fP, const float *\fIinput\fP, + size_t \fIoutput_rowsize\fP, size_t \fIoutput_cellsize\fP, + size_t \fIwidth\fP, size_t \fIheight\fP, + const LIBGLITTER_RENDER_CONTEXT *\fIrender_ctx\fP); + +void libglitter_compose_uint64(uint64_t **\fIoutputs\fP, const uint64_t *\fIinput\fP, + size_t \fIoutput_rowsize\fP, size_t \fIoutput_cellsize\fP, + size_t \fIwidth\fP, size_t \fIheight\fP, + const LIBGLITTER_RENDER_CONTEXT *\fIrender_ctx\fP); + +void libglitter_compose_uint32(uint32_t **\fIoutputs\fP, const uint32_t *\fIinput\fP, + size_t \fIoutput_rowsize\fP, size_t \fIoutput_cellsize\fP, + size_t \fIwidth\fP, size_t \fIheight\fP, + const LIBGLITTER_RENDER_CONTEXT *\fIrender_ctx\fP); + +void libglitter_compose_uint16(uint16_t **\fIoutputs\fP, const uint16_t *\fIinput\fP, + size_t \fIoutput_rowsize\fP, size_t \fIoutput_cellsize\fP, + size_t \fIwidth\fP, size_t \fIheight\fP, + const LIBGLITTER_RENDER_CONTEXT *\fIrender_ctx\fP); + +void libglitter_compose_uint8(uint8_t **\fIoutputs\fP, const uint8_t *\fIinput\fP, + size_t \fIoutput_rowsize\fP, size_t \fIoutput_cellsize\fP, + size_t \fIwidth\fP, size_t \fIheight\fP, + const LIBGLITTER_RENDER_CONTEXT *\fIrender_ctx\fP); +.fi +.PP +Link with +.IR "-lglitter" . +.SH DESCRIPTION +The +.BR libglitter_compose_double (), +.BR libglitter_compose_float (), +.BR libglitter_compose_uint64 (), +.BR libglitter_compose_uint32 (), +.BR libglitter_compose_uint16 (), +and +.BR libglitter_compose_uint8 (), +functions convert, based on input used to create the +.I render_ctx +argument (the +.BR libglitter_create_render_context (3) +function is used to create +.IR render_ctx ), +a raster (input to the function via the +.I input +parameter) with a text rendered with greyscale antialiasing +on subpixel resolution (rather than pixel resolution) into +a set of rasters with pixel resolution: one raster per colour +channel. +.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 when creating +.IR render_ctx . +.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 width +and +.I height +shall describe the affected area in the output 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. It shall not be the number of subpixels +in the input rasters, but rather the number of pixels, +which is easiest to think of in terms of the size of +the output rasters (minus any unused area, however +the pointers must point to the first used pixel). +.PP +All rasters are in row-major order. +.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_COMPOSE | LIBGLITTER_FEATURE_DOUBLE_TYPE +for +.BR libglitter_compose_double (), +.TP +.I LIBGLITTER_FEATURE_COMPOSE | LIBGLITTER_FEATURE_FLOAT_TYPE +for +.BR libglitter_compose_float (), +.TP +.I LIBGLITTER_FEATURE_COMPOSE | LIBGLITTER_FEATURE_UINT64_TYPE +for +.BR libglitter_compose_uint64 (), +.TP +.I LIBGLITTER_FEATURE_COMPOSE | LIBGLITTER_FEATURE_UINT32_TYPE +for +.BR libglitter_compose_uint32 (), +.TP +.I LIBGLITTER_FEATURE_COMPOSE | LIBGLITTER_FEATURE_UINT16_TYPE +for +.BR libglitter_compose_uint16 (), +or +.TP +.I LIBGLITTER_FEATURE_COMPOSE | LIBGLITTER_FEATURE_UINT8_TYPE +for +.BR libglitter_compose_uint8 (). +.RE +.SH RETURN VALUES +None. +.SH ERRORS +None. +.SH SEE ALSO +.BR libglitter (7), +.BR libglitter_colour_model_convert_rasters_double (3), +.BR libglitter_desaturate_double (3), +.BR libglitter_reorder_rasters (3), +.BR libglitter_split_uint64_raster (3) diff --git a/libglitter_compose_float.3 b/libglitter_compose_float.3 new file mode 120000 index 0000000..869c46a --- /dev/null +++ b/libglitter_compose_float.3 @@ -0,0 +1 @@ +libglitter_compose_double.3
\ No newline at end of file diff --git a/libglitter_compose_uint16.3 b/libglitter_compose_uint16.3 new file mode 120000 index 0000000..869c46a --- /dev/null +++ b/libglitter_compose_uint16.3 @@ -0,0 +1 @@ +libglitter_compose_double.3
\ No newline at end of file diff --git a/libglitter_compose_uint32.3 b/libglitter_compose_uint32.3 new file mode 120000 index 0000000..869c46a --- /dev/null +++ b/libglitter_compose_uint32.3 @@ -0,0 +1 @@ +libglitter_compose_double.3
\ No newline at end of file diff --git a/libglitter_compose_uint64.3 b/libglitter_compose_uint64.3 new file mode 120000 index 0000000..869c46a --- /dev/null +++ b/libglitter_compose_uint64.3 @@ -0,0 +1 @@ +libglitter_compose_double.3
\ No newline at end of file diff --git a/libglitter_compose_uint8.3 b/libglitter_compose_uint8.3 new file mode 120000 index 0000000..869c46a --- /dev/null +++ b/libglitter_compose_uint8.3 @@ -0,0 +1 @@ +libglitter_compose_double.3
\ No newline at end of file diff --git a/libglitter_create_render_context.3 b/libglitter_create_render_context.3 new file mode 100644 index 0000000..574ccf6 --- /dev/null +++ b/libglitter_create_render_context.3 @@ -0,0 +1,137 @@ +.TH LIBGLITTER_*_RENDER_CONTEXT 3 LIBGLITTER +.SH NAME +libglitter_create_render_context - Precompute data for libglitter_compose_*(3) +.br +libglitter_update_render_context - Precompute data for updated information for libglitter_compose_*(3) +.br +libglitter_free_render_context - Deallocate precompute data for libglitter_compose_*(3) +.SH SYNOPSIS +.LP +.nf +#include <libglitter.h> + +LIBGLITTER_RENDER_CONTEXT * +libglitter_create_render_context(size_t \fInoutputs\fP, size_t \fIrowsize\fP, + size_t \fIwidthmul\fP, size_t \fIheightmul\fP, + const uint8_t *\fIcellmap\fP, + const uint8_t *\fIncellvalues\fP); + +void libglitter_update_render_context(LIBGLITTER_RENDER_CONTEXT *\fIthis\fP, size_t \fIrowsize\fP); + +void libglitter_free_render_context(LIBGLITTER_RENDER_CONTEXT *\fIthis\fP); +.fi +.PP +Link with +.IR "-lglitter" . +.SH DESCRIPTION +The +.BR libglitter_create_render_context () +function precalculates information required for the +.BR libglitter_compose_double (3) +function and similar functions. +.PP +The +.I noutputs +argument shall be the number of rasters the +.BR libglitter_compose_double (3) +function and similar functions, output to; that is, +the number of primary colours of the output (normally +three: red, green, and blue). +.PP +The +.I rowsize +argument shall the number of cells the input raster +has per row. It required that the input raster's +cells are contigious for each row, meaning that +moving one element over moves one cell over, so +there is not cell size parameter. If the input +raster is modified to have a different number of +cellss per row, the returned object must be updated +using the +.BR libglitter_update_render_context () +function. +.PP +The +.I widthmul +argument shall be the number of cells the input +raster has in the horizontal dimension per pixel. +For the standard horizontally stacked vertical +stripes for red, green, and blue, this value is +three. A cell is not necessarily a subpixel, in +some layouts, some subpixels occupy multiple cells. +.PP +The +.I heighmul +argument shall be the number of cells the input +raster has in the vertical dimension per pixel. +For the standard horizontally stacked vertical +stripes for red, green, and blue, this value is +one. +.PP +The +.I cellmap +argument shall be a list of size +.IR (heightmul*widthmul) , +more specifically, it shall be a row-major matrix +of height +.I heightmul +and width +.IR widthmul . +Its elements shall be values in [0, +.IR noutputs ), +specifying which subpixel occupies each cell +for any pixel in the input raster. +.PP +Any pointer output by the +.BR libglitter_create_render_context () +function can, and (unless it is the null pointer) +should be, deallocated using the +.BR libglitter_free_render_context () +function. +.PP +For any value +.I i +in [0, +.IR noutputs ), +.I ncellvalues[i] +shall be the number of times the value +.I i +appears in +.IR cellmap . +.RE +.SH RETURN VALUES +The +.BR libglitter_create_render_context () +function returns, upon successful completion, +a pointer to newly allocated memory. On failure, +it returns +.IR NULL . +.PP +The +.BR libglitter_update_render_context () +and +.BR libglitter_free_render_context () +functions do not return any value. +.SH ERRORS +The +.BR libglitter_create_render_context () +can fail with the following errors: +.TP +.B ENOMEM +Could not allocate enough memory. +.PP +The +.BR libglitter_update_render_context () +and +.BR libglitter_free_render_context () +functions cannot fail. +.SH NOTES +In some (common) cases, the library infer the +values stored in +.I ncellvalues +rather than read +.IR ncellvalues . +.SH SEE ALSO +.BR libglitter (7), +.BR libglitter_compose_double (3), +.BR libglitter_reorder_rasters (3) diff --git a/libglitter_desaturate_double.3 b/libglitter_desaturate_double.3 new file mode 100644 index 0000000..057efb7 --- /dev/null +++ b/libglitter_desaturate_double.3 @@ -0,0 +1,141 @@ +.TH LIBGLITTER_*DESATURATE_* 3 LIBGLITTER +.SH NAME +libglitter_*desature_* - Create a blend between subpixel- and greyscale-antialiasing +.SH SYNOPSIS +.LP +.nf +#include <libglitter.h> + +void libglitter_desaturate_double(double **\fIrasters\fP, size_t \fInrasters\fP, + size_t \fIrowsize\fP, size_t \fIcellsize\fP, + size_t \fIwidth\fP, size_t \fIheight\fP, + double \fIsaturation\fP, + const double *\fIprimary_ys\fP); + +void libglitter_desaturate_float(float **\fIrasters\fP, size_t \fInrasters\fP, + size_t \fIrowsize\fP, size_t \fIcellsize\fP, + size_t \fIwidth\fP, size_t \fIheight\fP, + float \fIsaturation\fP, + const float *\fIprimary_ys\fP); + +void libglitter_per_channel_desaturate_double(double **\fIrasters\fP, size_t \fInrasters\fP, + size_t \fIrowsize\fP, size_t \fIcellsize\fP, + size_t \fIwidth\fP, size_t \fIheight\fP, + const double \fIsaturations\fP, + const double *\fIprimary_ys\fP); + +void libglitter_per_channel_desaturate_float(float **\fIrasters\fP, size_t \fInrasters\fP, + size_t \fIrowsize\fP, size_t \fIcellsize\fP, + size_t \fIwidth\fP, size_t \fIheight\fP, + const float \fIsaturations\fP, + const float *\fIprimary_ys\fP); +.fi +.PP +Link with +.IR "-lglitter -lm" . +.SH DESCRIPTION +The +.BR libglitter_desaturate_double (), +.BR libglitter_desaturate_float (), +.BR libglitter_per_channel_desaturate_double (), +and +.BR libglitter_per_channel_desaturate_float (), +functions desaturates a set of corasters (makes them more grey). +.PP +.I rasters +shall be the list of rasters, which are modified in place. +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. +.PP +The number of rasters shall be specified as the +.I nrasters +argument. +.PP +.I cellsize +shall be the number of elements in a raster the pointer +to the raster must be offset with to get to a pointer to +the next cell in the raster. +.PP +.I rowsize +shall be the number of cells (not elements; but rather the +number of elements divided by +.IR input_cellsize ) +in a 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 +For the +.BR libglitter_desaturate_double () +and +.BR libglitter_desaturate_float () +functions, the +.I saturation +argument shall be how saturated the subpixel-antialiasing shall +be, where 0 renders greyscale-antialiasing and 1 renders regular +subpixel-antialiasing. For the +.BR libglitter_per_channel_desaturate_double () +and +.BR libglitter_per_channel_desaturate_float () +functions this parameter is replaced with the +.I saturations +parameter which shall be a list of one saturation value per +raster: these functions let the user desaturate each channel +by a different amount. +.PP +Each primary colour's CIE Y value shall be provided via the +.I primary_ys +parameter. If you only have the output's primary colours' +chroma as CIE xy values, and the output's white point, the +.BR libglitter_get_colour_model_conversion_matrix_double (3) +and +.BR libglitter_get_colour_model_conversion_matrix_float (3) +can calculate and output the primary colour's CIE Y values. +.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_CU_DESATURATION | LIBGLITTER_FEATURE_DOUBLE_TYPE +for +.BR libglitter_desaturate_double (), +.TP +.I LIBGLITTER_FEATURE_CU_DESATURATION | LIBGLITTER_FEATURE_FLOAT_TYPE +for +.BR libglitter_desaturate_float (), +.TP +.I LIBGLITTER_FEATURE_PC_DESATURATION | LIBGLITTER_FEATURE_DOUBLE_TYPE +for +.BR libglitter_per_channel_desaturate_double (), +or +.TP +.I LIBGLITTER_FEATURE_PC_DESATURATION | LIBGLITTER_FEATURE_FLOAT_TYPE +for +.BR libglitter_per_channel_desaturate_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) diff --git a/libglitter_desaturate_float.3 b/libglitter_desaturate_float.3 new file mode 120000 index 0000000..28942e9 --- /dev/null +++ b/libglitter_desaturate_float.3 @@ -0,0 +1 @@ +libglitter_desaturate_double.3
\ No newline at end of file diff --git a/libglitter_enable_acceleration.3 b/libglitter_enable_acceleration.3 new file mode 100644 index 0000000..3f3f833 --- /dev/null +++ b/libglitter_enable_acceleration.3 @@ -0,0 +1,113 @@ +.TH LIBGLITTER_ENABLE_ACCELERATION 3 LIBGLITTER +.SH NAME +libglitter_enable_acceleration - Enable hardware acceleration +.SH SYNOPSIS +.LP +.nf +#include <libglitter.h> + +int libglitter_enable_acceleration(uint64_t \fIfeatures\fP, int \fIasync\fP, + void (*\fIcallback\fP)(int, int, void *), + void *\fIuserdata\fP, void *\fIunused\fP); +.fi +.PP +Link with +.IR "-lglitter" . +.SH DESCRIPTION +The +.BR libglitter_enable_acceleration () +function is planned to in the future enable hardware +acceleration. Because it can be expansive to enable hardware +acceleration (such as compiling code for the acceleration +hardware (normally a graphics card)), and depending on the +use case, it could also be too expensive to issue commands +to the acceleration hardware, (1) hardware acceleration +is not enabled by default, and (2) it can be enabled +asynchronous, meaning that the applications can use the +CPU implementations of the libraries functions at the +beginning of its runtime and enable hardware acceleration +in the background, and once it has been enabled, the +library will shift over to using the hardware acceleration. +.PP +The +.I features +parameter is used to specify which functions to enable +hardware acceleration for. Recognised values are documented +separately, in the documentation for the affected functions. +Any unsupported bit, or combination, is silently ignored. +.PP +To enable hardware acceleration asynchronously, specify a +non-zero value as the +.I async +argument. To enable hardware acceleration synchronously +(meaning that the function does not return until either +hardware acceleration has been enabled or failed to be +enabled), specify zero as the +.I async +argument. +.PP +Unless +.I callback +is +.IR NULL , +the function will call +.I *callback +immedately before it or the thread it spawns terminates. +The first argument will be set to the value the function +would return if +.I async +was 0, and the second argument will be set to the value +the function will set +.I errno +to if +.I async +was 0 (note that the function call still set +.I errno +if it returns a negative value even if +.I async +is not 0). The third argument will be +.IR userdata . +.PP +The +.I userdata +argument not used except for being passed into +.IR *callback . +.PP +The +.I unused +parameter is reserved for future use, +.I NULL +must be specified at the moment. +.SH RETURN VALUES +The +.BR libglitter_enable_acceleration () +function returns the value 1 if it completes successfully +with hardware acceleration enabled, the value 0 if it +completes successfully without hardware acceleration enabled +(this is what will usually happen if +.I async +is set to a non-zero value, but another value may still be +provided as the first argument to +.IR *callback ), +and a negative value on failure. The value -1 is reserved +for when the function sets +.I errno +to specify the error. Other negative values may be used +in the future to specify errors that do not have a good +.I errno +value. +.SH ERRORS +Currently none. +.SH FUTURE DIRECTIONS +The +.BR libglitter_enable_acceleration () +function, once properly implemented, will require additional +linking flags, including (probably) +.I -pthread +(for asynchronous operation) and linking to libraries needed +to use hardware acceleration. +.SH SEE ALSO +.BR libglitter (7), +.BR libglitter_colour_model_convert_rasters_double (3), +.BR libglitter_compose_double (3), +.BR libglitter_desaturate_double (3) diff --git a/libglitter_enable_acceleration.c b/libglitter_enable_acceleration.c index 791fe71..5539116 100644 --- a/libglitter_enable_acceleration.c +++ b/libglitter_enable_acceleration.c @@ -4,10 +4,11 @@ int -libglitter_enable_acceleration(uint64_t features, int async, void (*callback)(int r, int e, void *u), void *userdata) +libglitter_enable_acceleration(uint64_t features, int async, void (*callback)(int r, int e, void *u), void *userdata, void *unused) { (void) features; (void) async; + (void) unused; /* TODO add support for hardware acceleration */ @@ -45,30 +46,30 @@ int main(void) { char data = 'u'; - ASSERT(!libglitter_enable_acceleration(0, 0, NULL, NULL)); - ASSERT(!libglitter_enable_acceleration(0, 1, NULL, NULL)); - ASSERT(!libglitter_enable_acceleration(~0, 0, NULL, NULL)); - ASSERT(!libglitter_enable_acceleration(~0, 1, NULL, NULL)); - ASSERT(!libglitter_enable_acceleration(0, 0, NULL, &data)); - ASSERT(!libglitter_enable_acceleration(0, 1, NULL, &data)); - ASSERT(!libglitter_enable_acceleration(~0, 0, NULL, &data)); - ASSERT(!libglitter_enable_acceleration(~0, 1, NULL, &data)); + ASSERT(!libglitter_enable_acceleration(0, 0, NULL, NULL, NULL)); + ASSERT(!libglitter_enable_acceleration(0, 1, NULL, NULL, NULL)); + ASSERT(!libglitter_enable_acceleration(~0, 0, NULL, NULL, NULL)); + ASSERT(!libglitter_enable_acceleration(~0, 1, NULL, NULL, NULL)); + ASSERT(!libglitter_enable_acceleration(0, 0, NULL, &data, NULL)); + ASSERT(!libglitter_enable_acceleration(0, 1, NULL, &data, NULL)); + ASSERT(!libglitter_enable_acceleration(~0, 0, NULL, &data, NULL)); + ASSERT(!libglitter_enable_acceleration(~0, 1, NULL, &data, NULL)); ASSERT(callback_calls == 0); - ASSERT(!libglitter_enable_acceleration(0, 0, callback, &data)); + ASSERT(!libglitter_enable_acceleration(0, 0, callback, &data, NULL)); ASSERT(callback_calls == 1); - ASSERT(!libglitter_enable_acceleration(0, 1, callback, &data)); + ASSERT(!libglitter_enable_acceleration(0, 1, callback, &data, NULL)); ASSERT(callback_calls == 2); - ASSERT(!libglitter_enable_acceleration(~0, 0, callback, &data)); + ASSERT(!libglitter_enable_acceleration(~0, 0, callback, &data, NULL)); ASSERT(callback_calls == 3); - ASSERT(!libglitter_enable_acceleration(~0, 1, callback, &data)); + ASSERT(!libglitter_enable_acceleration(~0, 1, callback, &data, NULL)); ASSERT(callback_calls == 4); - ASSERT(!libglitter_enable_acceleration(0, 0, callback_null, NULL)); + ASSERT(!libglitter_enable_acceleration(0, 0, callback_null, NULL, NULL)); ASSERT(callback_calls == 5); - ASSERT(!libglitter_enable_acceleration(0, 1, callback_null, NULL)); + ASSERT(!libglitter_enable_acceleration(0, 1, callback_null, NULL, NULL)); ASSERT(callback_calls == 6); - ASSERT(!libglitter_enable_acceleration(~0, 0, callback_null, NULL)); + ASSERT(!libglitter_enable_acceleration(~0, 0, callback_null, NULL, NULL)); ASSERT(callback_calls == 7); - ASSERT(!libglitter_enable_acceleration(~0, 1, callback_null, NULL)); + ASSERT(!libglitter_enable_acceleration(~0, 1, callback_null, NULL, NULL)); ASSERT(callback_calls == 8); return 0; } diff --git a/libglitter_free_render_context.3 b/libglitter_free_render_context.3 new file mode 120000 index 0000000..63bb093 --- /dev/null +++ b/libglitter_free_render_context.3 @@ -0,0 +1 @@ +libglitter_create_render_context.3
\ No newline at end of file diff --git a/libglitter_get_colour_model_conversion_matrix_double.3 b/libglitter_get_colour_model_conversion_matrix_double.3 new file mode 100644 index 0000000..adf06e5 --- /dev/null +++ b/libglitter_get_colour_model_conversion_matrix_double.3 @@ -0,0 +1,124 @@ +.TH LIBGLITTER_GET_COLOUR_MODEL_CONVERSION_MATRIX_* 3 LIBGLITTER +.SH NAME +libglitter_get_colour_model_conversion_matrix_* - Create a column-major colour model conversion matrix +.SH SYNOPSIS +.LP +.nf +#include <libglitter.h> + +void libglitter_get_colour_model_conversion_matrix_double(double \fImatrix\fP[3][3], + double \fIc1x\fP, double \fIc1y\fP, + double \fIc2x\fP, double \fIc2y\fP, + double \fIc3x\fP, double \fIc3y\fP, + double \fIwhite_x\fP, double \fIwhite_y\fP, + double \fIwhite_Y\fP, int \fIxyz\fP, + double *\fIc1Yp\fP, double *\fIc2Yp\fP, + double *\fIc3Yp\fP); + +void libglitter_get_colour_model_conversion_matrix_float(float \fImatrix\fP[3][3], + float \fIc1x\fP, float \fIc1y\fP, + float \fIc2x\fP, float \fIc2y\fP, + float \fIc3x\fP, float \fIc3y\fP, + float \fIwhite_x\fP, float \fIwhite_y\fP, + float \fIwhite_Y\fP, int \fIxyz\fP, + float *\fIc1Yp\fP, float *\fIc2Yp\fP, + float *\fIc3Yp\fP); +.fi +.PP +Link with +.IR "-lglitter -lm" . +.SH DESCRIPTION +The +.BR libglitter_get_colour_model_conversion_matrix_double () +and +.BR libglitter_get_colour_model_conversion_matrix_float () +functions calculate the CIE XYZ values for an output's +primary colours from there chromas expressed as CIE xy +values (CIE xyY sans Y) and the output's whitepoint's +CIE xyY values. It is assumed that the output uses additive +colour mixing and that the blackpoint is perfect black. +After calculating the primary colours' CIE XYZ values, +the functions either output, to +.I matrix +a column-major conversion matrix from the output's colour +model to CIE XYZ (if +.I xyz +is non-zero) or a column-major conversion matrix from the +output's colour model to [0, 1]-normalised sRGB (otherwise). +.PP +The x and y values of the output's first primary colour +shall be input as the +.I c1x +and +.I c1y +arguments, the second primary colour's values as +.I c2x +and +.I c2y +and the third primary colour's values as +.I c3x +and +.IR c3y . +.PP +.IR white_x , +.IR white_y , +and +.IR white_Y +shall be the output's whitepoint's CIE xyY values +(x, y, and Y respectively). +.I white_Y +is normally 1, and if it is, and if the whitepoint is +also the D65 illuminant (which it usually is), the macro +.I LIBGLITTER_ILLUMINANT_D65 +can be used to specify these three arguments (it expands +into three arguments): +.RS +.nf + +void libglitter_get_colour_model_conversion_matrix_double(double \fImatrix\fP[3][3], + double \fIc1x\fP, double \fIc1y\fP, + double \fIc2x\fP, double \fIc2y\fP, + double \fIc3x\fP, double \fIc3y\fP, + LIBGLITTER_ILLUMINANT_D65, + int \fIxyz\fP, double *\fIc1Yp\fP, + double *\fIc2Yp\fP, double *\fIc3Yp\fP); + +void libglitter_get_colour_model_conversion_matrix_float(float \fImatrix\fP[3][3], + float \fIc1x\fP, float \fIc1y\fP, + float \fIc2x\fP, float \fIc2y\fP, + float \fIc3x\fP, float \fIc3y\fP, + LIBGLITTER_ILLUMINANT_D65, + int \fIxyz\fP, float *\fIc1Yp\fP, + float *\fIc2Yp\fP, float *\fIc3Yp\fP); +.fi +.RE +.PP +Unless +.I c1Yp +is +.IR NULL , +.I *c1Yp +is set to the first primary colour's CIE Y value. +Likewise, unless +.I c2Yp +is +.IR NULL , +.I *c2Yp +is set to the second primary colour's CIE Y value, +and unless +.I c3Yp +is +.IR NULL , +.I *c3Yp +is set to the third primary colour's CIE Y value, +.PP +The output's three primary colours not form a straight +line: they must render a three dimensional colour space. +.SH RETURN VALUES +None. +.SH ERRORS +None. +.SH SEE ALSO +.BR libglitter (7), +.BR libglitter_colour_model_convert_rasters_double (3), +.BR libglitter_desaturate_double (3) diff --git a/libglitter_get_colour_space_conversion_matrix_double.c b/libglitter_get_colour_model_conversion_matrix_double.c index 285f625..eb8a87d 100644 --- a/libglitter_get_colour_space_conversion_matrix_double.c +++ b/libglitter_get_colour_model_conversion_matrix_double.c @@ -29,7 +29,7 @@ static const double srgb[3][3] = { static void -invert(double m[3][4]) /* row-major order */ +eliminate(double m[3][4]) /* row-major order */ { double t; size_t i; @@ -49,16 +49,17 @@ invert(double m[3][4]) /* row-major order */ void -libglitter_get_colour_space_conversion_matrix_double(double matrix[3][3], double c1x, double c1y, +libglitter_get_colour_model_conversion_matrix_double(double matrix[3][3], double c1x, double c1y, double c2x, double c2y, double c3x, double c3y, - double white_x, double white_y, double white_Y, int xyz) + double white_x, double white_y, double white_Y, + int xyz, double *c1Yp, double *c2Yp, double *c3Yp) { double mat[3][4]; double x1, x2, x3; double y1, y2, y3; double z1, z2, z3; - /* Get colour space in CIE XYZ (the matrix is in row-major order) */ + /* Get colour model in CIE XYZ (the matrix is in row-major order) */ mat[0][0] = x1 = X(c1x, c1y); mat[0][1] = x2 = X(c2x, c2y); mat[0][2] = x3 = X(c3x, c3y); @@ -71,10 +72,16 @@ libglitter_get_colour_space_conversion_matrix_double(double matrix[3][3], double mat[2][1] = z2 = Z(c2x, c2y); mat[2][2] = z3 = Z(c3x, c3y); mat[2][3] = Z(white_x, white_y) * white_Y; - invert(mat); + eliminate(mat); y1 = mat[0][3]; y2 = mat[1][3]; y3 = mat[2][3]; + if (c1Yp) + *c1Yp = y1; + if (c2Yp) + *c2Yp = y2; + if (c3Yp) + *c3Yp = y3; /* [x1, x2, x3; y1, y2, y3; z1, z2, z3] is * the output RGB-to-CIE XYZ conversion matrix. diff --git a/libglitter_get_colour_model_conversion_matrix_float.3 b/libglitter_get_colour_model_conversion_matrix_float.3 new file mode 120000 index 0000000..eeab8a0 --- /dev/null +++ b/libglitter_get_colour_model_conversion_matrix_float.3 @@ -0,0 +1 @@ +libglitter_get_colour_model_conversion_matrix_double.3
\ No newline at end of file diff --git a/libglitter_get_colour_space_conversion_matrix_float.c b/libglitter_get_colour_model_conversion_matrix_float.c index 6f71baf..771151d 100644 --- a/libglitter_get_colour_space_conversion_matrix_float.c +++ b/libglitter_get_colour_model_conversion_matrix_float.c @@ -4,16 +4,18 @@ void -libglitter_get_colour_space_conversion_matrix_float(float matrix[3][3], float c1x, float c1y, +libglitter_get_colour_model_conversion_matrix_float(float matrix[3][3], float c1x, float c1y, float c2x, float c2y, float c3x, float c3y, - float white_x, float white_y, float white_Y, int xyz) + float white_x, float white_y, float white_Y, + int xyz, float *c1Yp, float *c2Yp, float *c3Yp) { - double double_matrix[3][3]; - libglitter_get_colour_space_conversion_matrix_double(double_matrix, + double double_matrix[3][3], c1Y, c2Y, c3Y; + libglitter_get_colour_model_conversion_matrix_double(double_matrix, (double)c1x, (double)c1y, (double)c2x, (double)c2y, (double)c3x, (double)c3y, - (double)white_x, (double)white_y, (double)white_Y, xyz); + (double)white_x, (double)white_y, (double)white_Y, + xyz, &c1Y, &c2Y, &c3Y); matrix[0][0] = (float)double_matrix[0][0]; matrix[0][1] = (float)double_matrix[0][1]; matrix[0][2] = (float)double_matrix[0][2]; @@ -23,6 +25,12 @@ libglitter_get_colour_space_conversion_matrix_float(float matrix[3][3], float c1 matrix[2][0] = (float)double_matrix[2][0]; matrix[2][1] = (float)double_matrix[2][1]; matrix[2][2] = (float)double_matrix[2][2]; + if (c1Yp) + *c1Yp = (float)c1Y; + if (c2Yp) + *c2Yp = (float)c2Y; + if (c3Yp) + *c3Yp = (float)c3Y; } diff --git a/libglitter_per_channel_desaturate_double.3 b/libglitter_per_channel_desaturate_double.3 new file mode 120000 index 0000000..28942e9 --- /dev/null +++ b/libglitter_per_channel_desaturate_double.3 @@ -0,0 +1 @@ +libglitter_desaturate_double.3
\ No newline at end of file diff --git a/libglitter_per_channel_desaturate_float.3 b/libglitter_per_channel_desaturate_float.3 new file mode 120000 index 0000000..703044f --- /dev/null +++ b/libglitter_per_channel_desaturate_float.3 @@ -0,0 +1 @@ +libglitter_per_channel_desaturate_double.3
\ No newline at end of file diff --git a/libglitter_reorder_rasters.3 b/libglitter_reorder_rasters.3 new file mode 100644 index 0000000..03aaf92 --- /dev/null +++ b/libglitter_reorder_rasters.3 @@ -0,0 +1,76 @@ +.TH LIBGLITTER_REORDER_RASTERS 3 LIBGLITTER +.SH NAME +libglitter_reorder_rasters - Reorder rasters from the application's order to the physical order +.SH SYNOPSIS +.LP +.nf +#include <libglitter.h> + +void libglitter_reorder_rasters(void **\fIrasters\fP, + enum libglitter_colour \fIcolour1\fP, + enum libglitter_colour \fIcolour2\fP, + enum libglitter_colour \fIcolour3\fP); +.fi +.PP +Link with +.IR "-lglitter" . +.SH DESCRIPTION +The +.BR libglitter_reorder_rasters (), +function reorders a set of three rasters to the +order desired by the +.BR libglitter_compose_double (3) +function and similar functions. +.PP +The +.I rasters +argument shall be a list of three rasters, in +the order (0) red, (1) green, (2) blue. During +the execution of the function, the function +will reorder the elements in this list. So that +it matches the order expected by the +.BR libglitter_compose_double (3) +function and similar functions, which is +determined the mean in the values in the +.I cellmap +argument input to the +.BR libglitter_create_render_context (3) +function. These meaning of these values is +specified via the +.IR colour1 , +.IR colour2 , +and +.I colour3 +parameters. The +.IR colour1 +argument shall specify colour of subpixel +whose index is 0 +.IR cellmap , +likewise the +.IR colour2 +argument shall specify colour of subpixel +whose index is 1 +.IR cellmap , +and the +.IR colour3 +argument shall specify colour of subpixel +whose index is 2. +.PP +Exactly one of +.IR colour1 , +.IR colour2 , +and +.I colour3 +shall be +.IR LIBGLITTER_CHANNEL_RED , +exactly one shall be +.IR LIBGLITTER_CHANNEL_GREEN , +and exactly one shall be +.IR LIBGLITTER_CHANNEL_BLUE . +.SH RETURN VALUES +None. +.SH ERRORS +None. +.SH SEE ALSO +.BR libglitter (7), +.BR libglitter_split_uint64_raster (3) diff --git a/libglitter_split_uint32_raster.3 b/libglitter_split_uint32_raster.3 new file mode 120000 index 0000000..1dfe00f --- /dev/null +++ b/libglitter_split_uint32_raster.3 @@ -0,0 +1 @@ +libglitter_split_uint64_raster.3
\ No newline at end of file diff --git a/libglitter_split_uint64_raster.3 b/libglitter_split_uint64_raster.3 new file mode 100644 index 0000000..001b279 --- /dev/null +++ b/libglitter_split_uint64_raster.3 @@ -0,0 +1,67 @@ +.TH LIBGLITTER_SPLIT_*_RASTER 3 LIBGLITTER +.SH NAME +libglitter_split_*_raster - Split an integer raster into mutliple rasters with narrower integers +.SH SYNOPSIS +.LP +.nf +#include <libglitter.h> + +void libglitter_split_uint64_raster(uint16_t *\fIrasters\fP[3], uint16_t **\fIalphap\fP, uint64_t *\fIraster\fP, + uint64_t \fIred\fP, uint64_t \fIgreen\fP, uint64_t \fIblue\fP); + +void libglitter_split_uint32_raster(uint8_t *\fIrasters\fP[3], uint8_t **\fIalphap\fP, uint32_t *\fIraster\fP, + uint32_t \fIred\fP, uint32_t \fIgreen\fP, uint32_t \fIblue\fP); +.fi +.PP +Link with +.IR "-lglitter" . +.SH DESCRIPTION +The +.BR libglitter_split_uint64_raster () +and +.BR libglitter_split_uint32_raster () +functions split the colour raster input in to the +.I raster +parameter into four intensity rasters, and output +the raster for the red channel to +.IR rasters[0] , +the raster for the green channel to +.IR rasters[1] , +and the raster for the blue channel to +.IR rasters[2] , +and unless +.I alphap +is null, it also outputs the alpha raster to +.IR *alphap . +.PP +For the +.BR libglitter_split_uint64_raster () +function, +.I red +shall be the value +.I 0xFFFF +shifted to make out a colour that is pure +primary red, +.I green +shall be the value +.I 0xFFFF +shifted to make out a colour that is pure +primary green, and +.I blue +shall be the value +.I 0xFFFF +shifted to make out a colour that is pure +primary blue. +For the +.BR libglitter_split_uint32_raster () +function, the value +.I 0xFF +is used rather than +.IR 0xFFFF . +.SH RETURN VALUES +None. +.SH ERRORS +None. +.SH SEE ALSO +.BR libglitter (7), +.BR libglitter_reorder_rasters (3) diff --git a/libglitter_update_render_context.3 b/libglitter_update_render_context.3 new file mode 120000 index 0000000..63bb093 --- /dev/null +++ b/libglitter_update_render_context.3 @@ -0,0 +1 @@ +libglitter_create_render_context.3
\ No newline at end of file |