diff options
Diffstat (limited to 'src/display/cairo-utils.h')
| -rw-r--r-- | src/display/cairo-utils.h | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/src/display/cairo-utils.h b/src/display/cairo-utils.h index af4727c01..2596cd969 100644 --- a/src/display/cairo-utils.h +++ b/src/display/cairo-utils.h @@ -108,6 +108,7 @@ guint32 ink_cairo_surface_average_color(cairo_surface_t *surface); void ink_cairo_surface_average_color(cairo_surface_t *surface, double &r, double &g, double &b, double &a); void ink_cairo_surface_average_color_premul(cairo_surface_t *surface, double &r, double &g, double &b, double &a); +double srgb_to_linear( const double c ); int ink_cairo_surface_srgb_to_linear(cairo_surface_t *surface); int ink_cairo_surface_linear_to_srgb(cairo_surface_t *surface); @@ -127,13 +128,13 @@ G_GNUC_CONST guint32 argb32_from_rgba(guint32 in); G_GNUC_CONST inline guint32 -premul_alpha(guint32 color, guint32 alpha) +premul_alpha(const guint32 color, const guint32 alpha) { - guint32 temp = alpha * color + 128; + const guint32 temp = alpha * color + 128; return (temp + (temp >> 8)) >> 8; } G_GNUC_CONST inline guint32 -unpremul_alpha(guint32 color, guint32 alpha) +unpremul_alpha(const guint32 color, const guint32 alpha) { // NOTE: you must check for alpha != 0 yourself. return (255 * color + alpha/2) / alpha; @@ -153,6 +154,15 @@ void feed_pathvector_to_cairo (cairo_t *ct, Geom::PathVector const &pathv); #define ASSEMBLE_ARGB32(px,a,r,g,b) \ guint32 px = (a << 24) | (r << 16) | (g << 8) | b; +inline double srgb_to_linear( const double c ) { + if( c < 0.04045 ) { + return c / 12.92; + } else { + return pow( (c+0.055)/1.055, 2.4 ); + } +} + + namespace Inkscape { namespace Display |