summaryrefslogtreecommitdiffstats
path: root/src
diff options
context:
space:
mode:
Diffstat (limited to 'src')
-rw-r--r--src/display/cairo-utils.cpp110
-rw-r--r--src/display/cairo-utils.h14
2 files changed, 124 insertions, 0 deletions
diff --git a/src/display/cairo-utils.cpp b/src/display/cairo-utils.cpp
index 2e2eb42dd..92303fed8 100644
--- a/src/display/cairo-utils.cpp
+++ b/src/display/cairo-utils.cpp
@@ -24,6 +24,7 @@
#include <2geom/transforms.h>
#include <2geom/sbasis-to-bezier.h>
#include "color.h"
+#include "style.h"
#include "helper/geom-curves.h"
namespace Inkscape {
@@ -276,6 +277,26 @@ feed_pathvector_to_cairo (cairo_t *ct, Geom::PathVector const &pathv)
}
}
+SPColorInterpolation
+get_cairo_surface_ci(cairo_surface_t *surface) {
+ void* data = cairo_surface_get_user_data( surface, &ci_key );
+ if( data != NULL ) {
+ return (SPColorInterpolation)GPOINTER_TO_INT( data );
+ } else {
+ return SP_CSS_COLOR_INTERPOLATION_AUTO;
+ }
+}
+
+void
+set_cairo_surface_ci(cairo_surface_t *surface, SPColorInterpolation ci) {
+ cairo_surface_set_user_data(surface, &ci_key, GINT_TO_POINTER (ci), NULL);
+}
+
+void
+copy_cairo_surface_ci(cairo_surface_t *in, cairo_surface_t *out) {
+ cairo_surface_set_user_data(out, &ci_key, cairo_surface_get_user_data(in, &ci_key), NULL);
+}
+
void
ink_cairo_set_source_rgba32(cairo_t *ct, guint32 rgba)
{
@@ -395,6 +416,7 @@ cairo_surface_t *
ink_cairo_surface_create_identical(cairo_surface_t *s)
{
cairo_surface_t *ns = ink_cairo_surface_create_same_size(s, cairo_surface_get_content(s));
+ cairo_surface_set_user_data(ns, &ci_key, cairo_surface_get_user_data(s, &ci_key), NULL);
return ns;
}
@@ -547,6 +569,94 @@ void ink_cairo_surface_average_color_premul(cairo_surface_t *surface, double &r,
a = CLAMP(a, 0.0, 1.0);
}
+void srgb_to_linear( guint32* c, guint32 a ) {
+
+ *c = unpremul_alpha( *c, a );
+
+ double cc = *c/255.0;
+
+ if( cc < 0.04045 ) {
+ cc /= 12.92;
+ } else {
+ cc = pow( (cc+0.055)/1.055, 2.4 );
+ }
+ cc *= 255.0;
+
+ *c = (int)cc;
+
+ *c = premul_alpha( *c, a );
+}
+
+void linear_to_srgb( guint32* c, guint32 a ) {
+
+ *c = unpremul_alpha( *c, a );
+
+ double cc = *c/255.0;
+
+ if( cc < 0.0031308 ) {
+ cc *= 12.92;
+ } else {
+ cc = pow( cc, 1.0/2.4 )*1.055-0.055;
+ }
+ cc *= 255.0;
+
+ *c = (int)cc;
+
+ *c = premul_alpha( *c, a );
+}
+
+int ink_cairo_surface_srgb_to_linear(cairo_surface_t *surface)
+{
+ cairo_surface_flush(surface);
+ int width = cairo_image_surface_get_width(surface);
+ int height = cairo_image_surface_get_height(surface);
+ int stride = cairo_image_surface_get_stride(surface);
+ unsigned char *data = cairo_image_surface_get_data(surface);
+
+ /* TODO convert this to OpenMP somehow */
+ for (int y = 0; y < height; ++y, data += stride) {
+ for (int x = 0; x < width; ++x) {
+ guint32 px = *reinterpret_cast<guint32*>(data + 4*x);
+ EXTRACT_ARGB32(px, a,r,g,b) ; // Unneeded semi-colon for indenting
+ if( a != 0 ) {
+ srgb_to_linear( &r, a );
+ srgb_to_linear( &g, a );
+ srgb_to_linear( &b, a );
+ }
+ ASSEMBLE_ARGB32(px2, a,r,g,b);
+ *reinterpret_cast<guint32*>(data + 4*x) = px2;
+ }
+ }
+ set_cairo_surface_ci( surface, SP_CSS_COLOR_INTERPOLATION_LINEARRGB );
+ return width * height;
+}
+
+int ink_cairo_surface_linear_to_srgb(cairo_surface_t *surface)
+{
+ cairo_surface_flush(surface);
+ int width = cairo_image_surface_get_width(surface);
+ int height = cairo_image_surface_get_height(surface);
+ int stride = cairo_image_surface_get_stride(surface);
+ unsigned char *data = cairo_image_surface_get_data(surface);
+
+ /* TODO convert this to OpenMP somehow */
+ for (int y = 0; y < height; ++y, data += stride) {
+ for (int x = 0; x < width; ++x) {
+ guint32 px = *reinterpret_cast<guint32*>(data + 4*x);
+ EXTRACT_ARGB32(px, a,r,g,b) ; // Unneeded semi-colon for indenting
+ if( a != 0 ) {
+ linear_to_srgb( &r, a );
+ linear_to_srgb( &g, a );
+ linear_to_srgb( &b, a );
+ }
+ ASSEMBLE_ARGB32(px2, a,r,g,b);
+ *reinterpret_cast<guint32*>(data + 4*x) = px2;
+ }
+ }
+ set_cairo_surface_ci( surface, SP_CSS_COLOR_INTERPOLATION_SRGB );
+ return width * height;
+}
+
cairo_pattern_t *
ink_cairo_pattern_create_checkerboard()
{
diff --git a/src/display/cairo-utils.h b/src/display/cairo-utils.h
index e67872891..edaf5ebaa 100644
--- a/src/display/cairo-utils.h
+++ b/src/display/cairo-utils.h
@@ -15,6 +15,7 @@
#include <glib.h>
#include <cairomm/cairomm.h>
#include <2geom/forward.h>
+#include "style.h"
struct SPColor;
struct _GdkPixbuf;
@@ -81,6 +82,16 @@ public:
} // namespace Inkscape
+/**
+ * Key for cairo_surface_t to keep track of current color interpolation value
+ * Only the address of the structure is used, it is never initialized. See:
+ * http://www.cairographics.org/manual/cairo-Types.html#cairo-user-data-key-t
+ */
+static cairo_user_data_key_t ci_key;
+SPColorInterpolation get_cairo_surface_ci(cairo_surface_t *surface);
+void set_cairo_surface_ci(cairo_surface_t *surface, SPColorInterpolation cif);
+void copy_cairo_surface_ci(cairo_surface_t *in, cairo_surface_t *out);
+
void ink_cairo_set_source_color(cairo_t *ct, SPColor const &color, double opacity);
void ink_cairo_set_source_rgba32(cairo_t *ct, guint32 rgba);
void ink_cairo_transform(cairo_t *ct, Geom::Affine const &m);
@@ -102,6 +113,9 @@ 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);
+int ink_cairo_surface_srgb_to_linear(cairo_surface_t *surface);
+int ink_cairo_surface_linear_to_srgb(cairo_surface_t *surface);
+
cairo_pattern_t *ink_cairo_pattern_create_checkerboard();
void convert_pixels_pixbuf_to_argb32(guchar *data, int w, int h, int rs);
generated by cgit v1.2.3 (git 2.25.1) at 2026-08-04 22:50:22 +0000