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authorTavian Barnes <tavianator@tavianator.com>2014-08-19 17:10:03 -0400
committerTavian Barnes <tavianator@tavianator.com>2015-10-25 11:03:56 -0400
commit7b09710392d35fb55b52031d447a542d99fc6b4b (patch)
tree270eb927ee8c52ceeb99926ebf4843704775a610 /libdimension/dimension/color.h
parent200c86b91ea7063d35be3bffc11c5da53c054653 (diff)
downloaddimension-7b09710392d35fb55b52031d447a542d99fc6b4b.tar.xz
Modularize the libdimension codebase.
Diffstat (limited to 'libdimension/dimension/color.h')
-rw-r--r--libdimension/dimension/color.h177
1 files changed, 13 insertions, 164 deletions
diff --git a/libdimension/dimension/color.h b/libdimension/dimension/color.h
index adbd396..74bed59 100644
--- a/libdimension/dimension/color.h
+++ b/libdimension/dimension/color.h
@@ -1,5 +1,5 @@
/*************************************************************************
- * Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com> *
+ * Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
@@ -20,174 +20,23 @@
/**
* @file
- * Colors.
+ * Color handling.
*/
-#include <stdbool.h>
+#ifndef DMNSN_COLOR_H
+#define DMNSN_COLOR_H
-/** A color value. */
-typedef struct {
- double R; /**< Red component. */
- double G; /**< Green component. */
- double B; /**< Blue component. */
-} dmnsn_color;
+#ifdef __cplusplus
+extern "C" {
+#endif
-/** A standard format string for colors. */
-#define DMNSN_COLOR_FORMAT "Color<%g, %g, %g>"
-/** The appropriate arguements to printf() a color. */
-#define DMNSN_COLOR_PRINTF(c) (c).R, (c).G, (c).B
+#include <dimension/math.h>
-/** Construct a new color. */
-DMNSN_INLINE dmnsn_color
-dmnsn_new_color(double R, double G, double B)
-{
- dmnsn_color ret = { R, G, B };
- return ret;
-}
-
-/** Apply sRGB gamma */
-DMNSN_INLINE double
-dmnsn_sRGB_gamma(double Clinear)
-{
- /*
- * If C represents R, G, and B, then the sRGB values are now found as follows:
- *
- * { 12.92*Clinear, Clinear <= 0.0031308
- * Csrgb = { 1/2.4
- * { (1.055)*Clinear - 0.055, Clinear > 0.0031308
- */
- if (Clinear == 1.0) {
- return 1.0; /* Map 1.0 to 1.0 instead of 0.9999999999999999 */
- } else if (Clinear > 0.0031308) {
- return 1.055*pow(Clinear, 1.0/2.4) - 0.055;
- } else {
- return 12.92*Clinear;
- }
-}
-
-/** Convert to sRGB space. */
-DMNSN_INLINE dmnsn_color
-dmnsn_color_to_sRGB(dmnsn_color color)
-{
- return dmnsn_new_color(
- dmnsn_sRGB_gamma(color.R),
- dmnsn_sRGB_gamma(color.G),
- dmnsn_sRGB_gamma(color.B)
- );
-}
-
-/** Remove sRGB gamma */
-DMNSN_INLINE double
-dmnsn_sRGB_inverse_gamma(double CsRGB)
-{
- /*
- * If C represents R, G, and B, then the Clinear values are now found as
- * follows:
- *
- * { Csrgb/12.92, Csrgb <= 0.04045
- * Clinear = { 2.4
- * { ((Csrgb + 0.055)/1.055) , Csrgb > 0.04045
- */
- if (CsRGB == 1.0) {
- return 1.0; /* Map 1.0 to 1.0 instead of 0.9999999999999999 */
- } else if (CsRGB <= 0.040449936) {
- return CsRGB/12.92;
- } else {
- return pow((CsRGB + 0.055)/1.055, 2.4);
- }
-}
-
-/** Convert from sRGB space. */
-DMNSN_INLINE dmnsn_color
-dmnsn_color_from_sRGB(dmnsn_color color)
-{
- return dmnsn_new_color(
- dmnsn_sRGB_inverse_gamma(color.R),
- dmnsn_sRGB_inverse_gamma(color.G),
- dmnsn_sRGB_inverse_gamma(color.B)
- );
-}
-
-/** Greyscale color intensity. */
-DMNSN_INLINE double
-dmnsn_color_intensity(dmnsn_color color)
-{
- return 0.2126*color.R + 0.7152*color.G + 0.0722*color.B;
-}
-
-/** Add two colors together. */
-DMNSN_INLINE dmnsn_color
-dmnsn_color_add(dmnsn_color lhs, dmnsn_color rhs)
-{
- return dmnsn_new_color(lhs.R + rhs.R, lhs.G + rhs.G, lhs.B + rhs.B);
-}
-
-/** Subtract two colors. */
-DMNSN_INLINE dmnsn_color
-dmnsn_color_sub(dmnsn_color lhs, dmnsn_color rhs)
-{
- return dmnsn_new_color(lhs.R - rhs.R, lhs.G - rhs.G, lhs.B - rhs.B);
-}
-
-/** Scale a color's intensity. */
-DMNSN_INLINE dmnsn_color
-dmnsn_color_mul(double n, dmnsn_color color)
-{
- return dmnsn_new_color(n*color.R, n*color.G, n*color.B);
-}
-
-/** Return the color at \p n on a gradient from \p c1 at 0 to \p c2 at 1. */
-DMNSN_INLINE dmnsn_color
-dmnsn_color_gradient(dmnsn_color c1, dmnsn_color c2, double n)
-{
- return dmnsn_new_color(
- n*(c2.R - c1.R) + c1.R,
- n*(c2.G - c1.G) + c1.G,
- n*(c2.B - c1.B) + c1.B
- );
-}
-
-/** Illuminate \p color with \p light. */
-DMNSN_INLINE dmnsn_color
-dmnsn_color_illuminate(dmnsn_color light, dmnsn_color color)
-{
- return dmnsn_new_color(light.R*color.R, light.G*color.G, light.B*color.B);
-}
+#include <dimension/color/color.h>
+#include <dimension/color/tcolor.h>
-/** Saturate the color components to [0.0, 1.0]. */
-DMNSN_INLINE dmnsn_color
-dmnsn_color_clamp(dmnsn_color color)
-{
- color.R = dmnsn_clamp(color.R, 0.0, 1.0);
- color.G = dmnsn_clamp(color.G, 0.0, 1.0);
- color.B = dmnsn_clamp(color.B, 0.0, 1.0);
- return color;
+#ifdef __cplusplus
}
+#endif
-/** Return whether a color contains any NaN components. */
-DMNSN_INLINE bool
-dmnsn_color_isnan(dmnsn_color color)
-{
- return dmnsn_isnan(color.R) || dmnsn_isnan(color.G) || dmnsn_isnan(color.B);
-}
-
-/* Standard colors */
-
-/** Black. */
-#define dmnsn_black dmnsn_new_color(0.0, 0.0, 0.0)
-/** White. */
-#define dmnsn_white dmnsn_new_color(1.0, 1.0, 1.0)
-/** Red. */
-#define dmnsn_red dmnsn_new_color(1.0, 0.0, 0.0)
-/** Green. */
-#define dmnsn_green dmnsn_new_color(0.0, 1.0, 0.0)
-/** Blue. */
-#define dmnsn_blue dmnsn_new_color(0.0, 0.0, 1.0)
-/** Magenta. */
-#define dmnsn_magenta dmnsn_new_color(1.0, 0.0, 1.0)
-/** Orange. */
-#define dmnsn_orange dmnsn_new_color(1.0, 0.21404114048223255, 0.0)
-/** Yellow. */
-#define dmnsn_yellow dmnsn_new_color(1.0, 1.0, 0.0)
-/** Cyan. */
-#define dmnsn_cyan dmnsn_new_color(0.0, 1.0, 1.0)
+#endif /* DMNSN_COLOR_H */