Add color manipulation utilities
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doc/Manual/en/BH_Color.pod
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314
doc/Manual/en/BH_Color.pod
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=encoding UTF-8
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=head1 NAME
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BH_Color - color manipulation utility
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=head1 SYNTAX
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#include <BH/Math/Box3f.h>
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cc prog.c -o prog -lbh
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=head1 DESCRIPTION
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The BH_Color module provides mechanism for color representation and translation
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between different color spaces color spaces (RGB, HSL and HSV). Additionally,
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this module provides mechanism for blending two colors.
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=head1 NOTES
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Internally, color is stored in four 16-bit integers.
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When converting between RGB and HSV/HSL there is ~0.009% error. While this is
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not an issue, if you are using 8-bit RGB value, this may become a problem for
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the 16-bit RGB values (not every RGB value can be represented in unique HSV/HSL
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value). If you need this kind of precision, then this module is not for you.
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Almost all color blending modes work like in other software packages. The
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exception is I<BH_COLOR_MODE_SOFT_LIGHT>. This library opted-in for the Pegtop's
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version of the formula (which might yield different results). This might be an
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issue if you are trying to implement standard complient SVG or PDF renderer.
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The I<BH_COLOR_MODE_HUE>, I<BH_COLOR_MODE_SATURATION>, I<BH_COLOR_MODE_COLOR>
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and I<BH_COLOR_MODE_LUMINOSITY> are implemented in HSL color space.
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=head1 API CALLS
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=head2 BH_ColorRGBA8
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void BH_ColorRGBA8(const BH_Color *color,
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uint8_t *r,
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uint8_t *g,
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uint8_t *b,
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uint8_t *a);
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Gets 8-bit RGBA representation of the I<color>.
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Parameters I<r>, I<g>, I<b>, I<a> represent color components in RGB color space.
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=head2 BH_ColorRGBA16
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void BH_ColorRGBA16(const BH_Color *color,
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uint16_t *r,
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uint16_t *g,
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uint16_t *b,
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uint16_t *a);
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Gets 16-bit RGBA representation of the I<color>.
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Parameters I<r>, I<g>, I<b>, I<a> represent color components in RGB color space.
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=head2 BH_ColorRGBAf
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void BH_ColorRGBAf(const BH_Color *color,
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float *r,
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float *g,
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float *b,
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float *a);
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Gets floating-point RGBA representation of the I<color>.
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Parameters I<r>, I<g>, I<b>, I<a> represent color components in RGB color space.
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=head2 BH_ColorSetRGBA8
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void BH_ColorSetRGBA8(BH_Color *color,
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uint8_t r,
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uint8_t g,
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uint8_t b,
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uint8_t a);
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Sets 8-bit I<r>, I<g>, I<b>, I<a> components of the color.
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=head2 BH_ColorSetRGBA16
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void BH_ColorSetRGBA16(BH_Color *color,
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uint16_t r,
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uint16_t g,
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uint16_t b,
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uint16_t a);
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Sets 16-bit I<r>, I<g>, I<b>, I<a> components of the color.
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=head2 BH_ColorSetRGBAf
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void BH_ColorSetRGBAf(BH_Color *color,
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float r,
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float g,
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float b,
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float a);
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Sets floating-point I<r>, I<g>, I<b>, I<a> components of the color.
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=head2 BH_ColorHSVAf
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void BH_ColorHSVAf(const BH_Color *color,
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float *h,
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float *s,
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float *v,
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float *a);
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Gets floating-point HSV representation of the I<color>.
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Parameters I<h>, I<s>, I<v>, I<a> represent color components in HSV color space.
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=head2 BH_ColorSetHSVAf
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void BH_ColorSetHSVAf(BH_Color *color,
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float h,
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float s,
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float v,
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float a);
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Sets floating-point I<h>, I<s>, I<v>, I<a> components of the color.
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=head2 BH_ColorHSLAf
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void BH_ColorHSLAf(const BH_Color *color,
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float *h,
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float *s,
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float *l,
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float *a);
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Gets floating-point HSL representation of the I<color>.
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Parameters I<h>, I<s>, I<l>, I<a> represent color components in HSV color space.
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=head2 BH_ColorSetHSLAf
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void BH_ColorSetHSLAf(BH_Color *color,
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float h,
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float s,
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float l,
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float a);
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Sets floating-point I<h>, I<s>, I<l>, I<a> components of the color.
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=head2 BH_ColorToRGBA
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void BH_ColorToRGBA(const BH_Color *color,
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BH_Color *out);
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Converts I<color> to RGB color space.
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=head2 BH_ColorToHSVA
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void BH_ColorToHSVA(const BH_Color *color,
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BH_Color *out);
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Converts I<color> to HSV color space.
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=head2 BH_ColorToHSLA
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void BH_ColorToHSLA(const BH_Color *color,
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BH_Color *out);
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Converts I<color> to HSL color space.
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=head2 BH_ColorBlend
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void BH_ColorBlend(const BH_Color *foreground,
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const BH_Color *background,
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int mode,
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BH_Color *dest);
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Blends I<foreground> and I<background> color, using specified blending I<mode>.
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The following modes can be used:
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=over
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=item B<BH_COLOR_MODE_NORMAL>
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r = f
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=item B<BH_COLOR_MODE_MULTIPLY>
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r = f * b
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=item B<BH_COLOR_MODE_SCREEN>
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r = 1 - (1 - f) * (1 - b)
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=item B<BH_COLOR_MODE_OVERLAY>
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r = HardLight(b, f)
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=item B<BH_COLOR_MODE_DARKEN>
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r = min(f, b)
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=item B<BH_COLOR_MODE_LIGHTEN>
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r = max(f, b)
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=item B<BH_COLOR_MODE_COLOR_DODGE>
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r = min(1, b / (1 - f))
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=item B<BH_COLOR_MODE_COLOR_BURN>
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r = 1 - min(1, (1 - b) / f)
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=item B<BH_COLOR_MODE_LINEAR_DODGE>
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r = f + b
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=item B<BH_COLOR_MODE_LINEAR_BURN>
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r = f + b - 1
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=item B<BH_COLOR_MODE_HARD_LIGHT>
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if (f < 0.5)
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r = Multipy(2 * f, b)
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else
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r = Screen(2 * f - 1, b)
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=item B<BH_COLOR_MODE_SOFT_LIGHT>
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r = (1 - 2 * f) * b^2 + 2 * f * b
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=item B<BH_COLOR_MODE_DIFFERENCE>
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r = abs(f - b)
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=item B<BH_COLOR_MODE_EXCLUSION>
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r = f + b - (2 * f * b)
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=item B<BH_COLOR_MODE_HUE>
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r = HSL(H(f), S(b), L(b))
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=item B<BH_COLOR_MODE_SATURATION>
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r = HSL(H(b), S(f), L(b))
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=item B<BH_COLOR_MODE_COLOR>
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r = HSL(H(f), S(f), L(b))
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=item B<BH_COLOR_MODE_LUMINOSITY>
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r = HSL(H(b), S(b), L(f))
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=back
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=head1 STRUCTURES
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=head2 BH_Color
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typedef struct BH_Color
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{
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int type;
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union
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{
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struct
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{
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uint16_t r;
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uint16_t g;
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uint16_t b;
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uint16_t a;
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} rgba;
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struct
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{
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uint16_t h;
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uint16_t s;
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uint16_t v;
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uint16_t a;
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} hsva;
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struct
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{
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uint16_t h;
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uint16_t s;
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uint16_t l;
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uint16_t a;
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} hsla;
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} data;
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} BH_Color;
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=head1 SEE ALSO
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L<BH>
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@@ -5,6 +5,7 @@ HTMLS = BH_Algo.html \
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BH_Args.html \
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BH_Box2f.html \
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BH_Box3f.html \
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BH_Color.html \
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BH_Hashmap.html \
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BH_IO.html \
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BH_Line.html \
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@@ -31,6 +32,7 @@ MANS = BH_Algo.3 \
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BH_Args.3 \
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BH_Box2f.3 \
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BH_Box3f.3 \
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BH_Color.3 \
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BH_Hashmap.3 \
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BH_IO.3 \
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BH_Line.3 \
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