#include "images/images.h"
-// A comparison of four multimedia RGB spaces, Danny Pascale
-
+/* Basic color spaces */
enum {
COLOR_SPACE_UNKNOWN = 0,
+ COLOR_SPACE_UNKNOWN_1 = 1, /* unknown 1-channel color space */
+ COLOR_SPACE_UNKNOWN_2 = 2, /* unknown 2-channels color space */
+ COLOR_SPACE_UNKNOWN_3 = 3, /* unknown 3-channels color space */
+ COLOR_SPACE_UNKNOWN_4 = 4, /* unknown 4-channels color space */
+ COLOR_SPACE_UNKNOWN_MAX = 4,
COLOR_SPACE_GRAYSCALE,
COLOR_SPACE_RGB,
COLOR_SPACE_XYZ,
COLOR_SPACE_LAB,
COLOR_SPACE_LUV,
COLOR_SPACE_YCBCR,
+ COLOR_SPACE_CMYK,
+ COLOR_SPACE_YCCK,
COLOR_SPACE_MAX
};
+extern uns color_space_channels[COLOR_SPACE_MAX];
+extern byte *color_space_name[COLOR_SPACE_MAX];
+
+/* Color space ID <-> name conversions */
+byte *color_space_id_to_name(uns id);
+uns color_space_name_to_id(byte *name);
+
+/* Struct color manipulation */
+int color_get(struct color *color, byte *src, uns src_space);
+int color_put(struct image_context *ctx, struct color *color, byte *dest, uns dest_space);
+
+static inline void
+color_make_gray(struct color *color, uns gray)
+{
+ color->c[0] = gray;
+ color->color_space = COLOR_SPACE_GRAYSCALE;
+}
+
+static inline void
+color_make_rgb(struct color *color, uns r, uns g, uns b)
+{
+ color->c[0] = r;
+ color->c[1] = g;
+ color->c[2] = b;
+ color->color_space = COLOR_SPACE_RGB;
+}
+
+extern struct color color_black, color_white;
+
+/* Conversion between various pixel formats */
+
+enum {
+ IMAGE_CONV_FILL_ALPHA = 1,
+ IMAGE_CONV_COPY_ALPHA = 2,
+ IMAGE_CONV_APPLY_ALPHA = 4,
+};
+
+struct image_conv_options {
+ uns flags;
+ struct color background;
+};
+
+extern struct image_conv_options image_conv_defaults;
+
+int image_conv(struct image_context *ctx, struct image *dest, struct image *src, struct image_conv_options *opt);
+
/* Color spaces in the CIE 1931 chromacity diagram */
struct color_space_chromacity_info {
return (r * 19660 + g * 38666 + b * 7210) >> 16;
}
-extern struct color color_black, color_white;
-
-static inline void
-color_make_gray(struct color *color, uns gray)
-{
- color->c[0] = gray;
- color->color_space = COLOR_SPACE_GRAYSCALE;
-}
-
-static inline void
-color_make_rgb(struct color *color, uns r, uns g, uns b)
-{
- color->c[0] = r;
- color->c[1] = g;
- color->c[2] = b;
- color->color_space = COLOR_SPACE_RGB;
-}
-
-void color_put_color_space(byte *dest, struct color *color, uns color_space);
-void color_put_grayscale(byte *dest, struct color *color);
-void color_put_rgb(byte *dest, struct color *color);
-
/* Exact slow conversion routines */
void srgb_to_xyz_exact(double dest[3], double src[3]);
void xyz_to_srgb_exact(double dest[3], double src[3]);
void xyz_to_luv_exact(double dest[3], double src[3]);
void luv_to_xyz_exact(double dest[3], double src[3]);
+void rgb_to_cmyk_exact(double dest[4], double src[3]);
+void cmyk_to_rgb_exact(double dest[3], double src[4]);
/* Reference white */
#define REF_WHITE_X 0.96422