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app, libgimpcolor: 2 new libgimpcolor functions.
Adding gimp_color_is_out_of_gamut() and gimp_color_is_out_of_self_gamut() and using them where relevant.
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Jehan
parent
4a30f431fd
commit
ee19ad54d6
6 changed files with 197 additions and 132 deletions
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@ -144,6 +144,184 @@ gimp_color_is_perceptually_identical (GeglColor *color1,
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#undef SQR
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}
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/**
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* gimp_color_is_out_of_self_gamut:
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* @color: a [class@Gegl.Color]
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*
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* Determine whether @color is out of its own space gamut. This can only
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* happen if the color space is unbounded and any of the color component
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* is out of the `[0; 1]` range.
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* A small error of margin is accepted, so that for instance a component
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* at -0.0000001 is not making the whole color to be considered as
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* out-of-gamut while it may just be computation imprecision.
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*
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* Returns: whether the color is out of its own color space gamut.
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*
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* Since: 3.0
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**/
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gboolean
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gimp_color_is_out_of_self_gamut (GeglColor *color)
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{
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const Babl *format;
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const Babl *space;
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const Babl *ctype;
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gboolean oog = FALSE;
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format = gegl_color_get_format (color);
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space = babl_format_get_space (format);
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/* XXX assuming that all components have the same type. */
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ctype = babl_format_get_type (format, 0);
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if (ctype == babl_type ("half") ||
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ctype == babl_type ("float") ||
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ctype == babl_type ("double"))
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{
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/* Only unbounded colors can be out-of-gamut. */
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const Babl *model;
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model = babl_format_get_model (format);
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#define CHANNEL_EPSILON 1e-3
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if (model == babl_model ("R'G'B'") ||
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model == babl_model ("R~G~B~") ||
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model == babl_model ("RGB") ||
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model == babl_model ("R'G'B'A") ||
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model == babl_model ("R~G~B~A") ||
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model == babl_model ("RGBA"))
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{
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gdouble rgb[3];
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gegl_color_get_pixel (color, babl_format_with_space ("RGB double", space), rgb);
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oog = ((rgb[0] < 0.0 && -rgb[0] > CHANNEL_EPSILON) ||
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(rgb[0] > 1.0 && rgb[0] - 1.0 > CHANNEL_EPSILON) ||
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(rgb[1] < 0.0 && -rgb[1] > CHANNEL_EPSILON) ||
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(rgb[1] > 1.0 && rgb[1] - 1.0 > CHANNEL_EPSILON) ||
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(rgb[2] < 0.0 && -rgb[2] > CHANNEL_EPSILON) ||
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(rgb[2] > 1.0 && rgb[2] - 1.0 > CHANNEL_EPSILON));
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}
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else if (model == babl_model ("Y'") ||
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model == babl_model ("Y~") ||
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model == babl_model ("Y") ||
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model == babl_model ("Y'A") ||
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model == babl_model ("Y~A") ||
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model == babl_model ("YA"))
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{
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gdouble gray[1];
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gegl_color_get_pixel (color, babl_format_with_space ("Y double", space), gray);
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oog = ((gray[0] < 0.0 && -gray[0] > CHANNEL_EPSILON) ||
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(gray[0] > 1.0 && gray[0] - 1.0 > CHANNEL_EPSILON));
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}
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else if (model == babl_model ("CMYK") ||
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model == babl_model ("CMYKA") ||
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model == babl_model ("cmyk") ||
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model == babl_model ("cmykA"))
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{
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gdouble cmyk[4];
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gegl_color_get_pixel (color, babl_format_with_space ("CMYK double", space), cmyk);
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oog = ((cmyk[0] < 0.0 && -cmyk[0] > CHANNEL_EPSILON) ||
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(cmyk[0] > 1.0 && cmyk[0] - 1.0 > CHANNEL_EPSILON) ||
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(cmyk[1] < 0.0 && -cmyk[1] > CHANNEL_EPSILON) ||
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(cmyk[1] > 1.0 && cmyk[1] - 1.0 > CHANNEL_EPSILON) ||
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(cmyk[2] < 0.0 && -cmyk[2] > CHANNEL_EPSILON) ||
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(cmyk[2] > 1.0 && cmyk[2] - 1.0 > CHANNEL_EPSILON) ||
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(cmyk[3] < 0.0 && -cmyk[3] > CHANNEL_EPSILON) ||
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(cmyk[3] > 1.0 && cmyk[3] - 1.0 > CHANNEL_EPSILON));
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}
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#undef CHANNEL_EPSILON
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}
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return oog;
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}
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/**
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* gimp_color_is_out_of_gamut:
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* @color: a [class@Gegl.Color]
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* @space: a color space to convert @color to.
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*
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* Determine whether @color is out of its @space gamut.
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* A small error of margin is accepted, so that for instance a component
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* at -0.0000001 is not making the whole color to be considered as
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* out-of-gamut while it may just be computation imprecision.
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*
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* Returns: whether the color is out of @space gamut.
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*
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* Since: 3.0
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**/
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gboolean
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gimp_color_is_out_of_gamut (GeglColor *color,
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const Babl *space)
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{
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gboolean is_out_of_gamut = FALSE;
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#define CHANNEL_EPSILON 1e-3
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if (babl_space_is_gray (space))
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{
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gfloat gray[1];
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gegl_color_get_pixel (color,
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babl_format_with_space ("Y' float", space),
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gray);
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is_out_of_gamut = ((gray[0] < 0.0 && -gray[0] > CHANNEL_EPSILON) ||
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(gray[0] > 1.0 && gray[0] - 1.0 > CHANNEL_EPSILON));
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if (! is_out_of_gamut)
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{
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gdouble rgb[3];
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/* Grayscale colors can be out of gamut if the color is out of the [0;
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* 1] range in the target space and also if they can be converted to
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* RGB with non-equal components.
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*/
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gegl_color_get_pixel (color,
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babl_format_with_space ("R'G'B' double", space),
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rgb);
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is_out_of_gamut = (ABS (rgb[0] - rgb[0]) > CHANNEL_EPSILON ||
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ABS (rgb[1] - rgb[1]) > CHANNEL_EPSILON ||
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ABS (rgb[2] - rgb[2]) > CHANNEL_EPSILON);
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}
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}
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else if (babl_space_is_cmyk (space))
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{
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gdouble cmyk[4];
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gegl_color_get_pixel (color,
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babl_format_with_space ("CMYK double", space),
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cmyk);
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/* We make sure that each component is within [0; 1], but accept a small
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* error of margin (we don't want to show small precision errors as
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* out-of-gamut colors).
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*/
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is_out_of_gamut = ((cmyk[0] < 0.0 && -cmyk[0] > CHANNEL_EPSILON) ||
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(cmyk[0] > 1.0 && cmyk[0] - 1.0 > CHANNEL_EPSILON) ||
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(cmyk[1] < 0.0 && -cmyk[1] > CHANNEL_EPSILON) ||
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(cmyk[1] > 1.0 && cmyk[1] - 1.0 > CHANNEL_EPSILON) ||
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(cmyk[2] < 0.0 && -cmyk[2] > CHANNEL_EPSILON) ||
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(cmyk[2] > 1.0 && cmyk[2] - 1.0 > CHANNEL_EPSILON) ||
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(cmyk[3] < 0.0 && -cmyk[3] > CHANNEL_EPSILON) ||
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(cmyk[3] > 1.0 && cmyk[3] - 1.0 > CHANNEL_EPSILON));
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}
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else
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{
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gdouble rgb[3];
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gegl_color_get_pixel (color,
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babl_format_with_space ("R'G'B' double", space),
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rgb);
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is_out_of_gamut = ((rgb[0] < 0.0 && -rgb[0] > CHANNEL_EPSILON) ||
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(rgb[0] > 1.0 && rgb[0] - 1.0 > CHANNEL_EPSILON) ||
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(rgb[1] < 0.0 && -rgb[1] > CHANNEL_EPSILON) ||
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(rgb[1] > 1.0 && rgb[1] - 1.0 > CHANNEL_EPSILON) ||
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(rgb[2] < 0.0 && -rgb[2] > CHANNEL_EPSILON) ||
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(rgb[2] > 1.0 && rgb[2] - 1.0 > CHANNEL_EPSILON));
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}
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#undef CHANNEL_EPSILON
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return is_out_of_gamut;
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}
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/* Private functions. */
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@ -19,6 +19,8 @@ EXPORTS
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gimp_cmyka_get_uchar
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gimp_cmyka_set
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gimp_cmyka_set_uchar
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gimp_color_is_out_of_gamut
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gimp_color_is_out_of_self_gamut
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gimp_color_is_perceptually_identical
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gimp_color_managed_get_color_profile
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gimp_color_managed_get_icc_profile
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@ -56,6 +56,9 @@ gboolean gimp_color_is_perceptually_identical (GeglColor *color1,
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GeglColor * gimp_color_parse_css (const gchar *css,
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gint len);
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gboolean gimp_color_is_out_of_self_gamut (GeglColor *color);
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gboolean gimp_color_is_out_of_gamut (GeglColor *color,
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const Babl *space);
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G_END_DECLS
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