Add initial color management framework code
ICC profiles can now be specified in weston.ini for each output, or a CMS
implementation can optionally loaded from a pluggable module.
diff --git a/src/cms-helper.c b/src/cms-helper.c
new file mode 100644
index 0000000..2c7b57f
--- /dev/null
+++ b/src/cms-helper.c
@@ -0,0 +1,134 @@
+/*
+ * Copyright © 2013 Richard Hughes
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission. The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#ifdef HAVE_LCMS
+#include <lcms2.h>
+#endif
+
+#include "compositor.h"
+#include "cms-helper.h"
+
+#ifdef HAVE_LCMS
+static void
+weston_cms_gamma_clear(struct weston_output *o)
+{
+ int i;
+ uint16_t *red;
+
+ if (!o->set_gamma)
+ return;
+
+ red = calloc(o->gamma_size, sizeof(uint16_t));
+ for (i = 0; i < o->gamma_size; i++)
+ red[i] = (uint32_t) 0xffff * (uint32_t) i / (uint32_t) (o->gamma_size - 1);
+ o->set_gamma(o, o->gamma_size, red, red, red);
+ free(red);
+}
+#endif
+
+void
+weston_cms_set_color_profile(struct weston_output *o,
+ struct weston_color_profile *p)
+{
+#ifdef HAVE_LCMS
+ cmsFloat32Number in;
+ const cmsToneCurve **vcgt;
+ int i;
+ int size;
+ uint16_t *red = NULL;
+ uint16_t *green = NULL;
+ uint16_t *blue = NULL;
+
+ if (!o->set_gamma)
+ return;
+ if (!p) {
+ weston_cms_gamma_clear(o);
+ return;
+ }
+
+ weston_log("Using ICC profile %s\n", p->filename);
+ vcgt = cmsReadTag (p->lcms_handle, cmsSigVcgtTag);
+ if (vcgt == NULL || vcgt[0] == NULL) {
+ weston_cms_gamma_clear(o);
+ return;
+ }
+
+ size = o->gamma_size;
+ red = calloc(size, sizeof(uint16_t));
+ green = calloc(size, sizeof(uint16_t));
+ blue = calloc(size, sizeof(uint16_t));
+ for (i = 0; i < size; i++) {
+ in = (cmsFloat32Number) i / (cmsFloat32Number) (size - 1);
+ red[i] = cmsEvalToneCurveFloat(vcgt[0], in) * (double) 0xffff;
+ green[i] = cmsEvalToneCurveFloat(vcgt[1], in) * (double) 0xffff;
+ blue[i] = cmsEvalToneCurveFloat(vcgt[2], in) * (double) 0xffff;
+ }
+ o->set_gamma(o, size, red, green, blue);
+ free(red);
+ free(green);
+ free(blue);
+#endif
+}
+
+void
+weston_cms_destroy_profile(struct weston_color_profile *p)
+{
+ if (!p)
+ return;
+#ifdef HAVE_LCMS
+ cmsCloseProfile(p->lcms_handle);
+#endif
+ free(p->filename);
+ free(p);
+}
+
+struct weston_color_profile *
+weston_cms_create_profile(const char *filename,
+ void *lcms_profile)
+{
+ struct weston_color_profile *p;
+ p = calloc(1, sizeof(struct weston_color_profile));
+ p->filename = strdup(filename);
+ p->lcms_handle = lcms_profile;
+ return p;
+}
+
+struct weston_color_profile *
+weston_cms_load_profile(const char *filename)
+{
+ struct weston_color_profile *p = NULL;
+#ifdef HAVE_LCMS
+ cmsHPROFILE lcms_profile;
+ lcms_profile = cmsOpenProfileFromFile(filename, "r");
+ if (lcms_profile)
+ p = weston_cms_create_profile(filename, lcms_profile);
+#endif
+ return p;
+}