commit 5b9549acaa26e3e2cae8919a0ee0e4cdeb59e1e8
author Brian Osman <brianosman@google.com> Wed May 09 14:56:54 2018 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> Wed May 09 19:04:51 2018 +0000
tree f20f692811ea0ba566f4ce8e5f28e745b9471053
parent 78ee9e8913e0ab2ddb5208b7844b24f1301ce37e

Add utilities for programmatically making profiles

These are trivial, but some image decoders or other code may need them.

Change-Id: Ia646711c85d2eac6eef3d90cc5c27df5afac930a
Reviewed-on: https://skia-review.googlesource.com/127120
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>

skcms.h

diff --git a/skcms.h b/skcms.h
index 79d0abf..0451a58 100644
--- a/skcms.h
+++ b/skcms.h
@@ -16,6 +16,7 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <string.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -238,6 +239,28 @@
                                        float wx, float wy,
                                        skcms_Matrix3x3* toXYZD50);
 
+// Utilities for programmatically constructing profiles
+static inline void skcms_Init(skcms_ICCProfile* p) {
+    memset(p, 0, sizeof(*p));
+    p->data_color_space = skcms_Signature_RGB;
+    p->pcs = skcms_Signature_XYZ;
+}
+
+static inline void skcms_SetTransferFunction(skcms_ICCProfile* p,
+                                             const skcms_TransferFunction* tf) {
+    p->has_trc = true;
+    for (int i = 0; i < 3; ++i) {
+        p->trc[i].table_entries = 0;
+        p->trc[i].parametric = *tf;
+        p->has_poly_tf[i] = false;
+    }
+}
+
+static inline void skcms_SetXYZD50(skcms_ICCProfile* p, const skcms_Matrix3x3* m) {
+    p->has_toXYZD50 = true;
+    p->toXYZD50 = *m;
+}
+
 #ifdef __cplusplus
 }
 #endif

tests.c

diff --git a/tests.c b/tests.c
index 15d3c02..7a38533 100644
--- a/tests.c
+++ b/tests.c
@@ -1149,6 +1149,23 @@
         }
 }
 
+static void test_Programmatic_sRGB() {
+    skcms_Matrix3x3 srgb_to_xyz;
+    expect(skcms_PrimariesToXYZD50(0.64f, 0.33f,
+                                   0.30f, 0.60f,
+                                   0.15f, 0.06f,
+                                   0.3127f, 0.3290f,
+                                   &srgb_to_xyz));
+    skcms_ICCProfile srgb = *skcms_sRGB_profile();
+
+    skcms_ICCProfile p;
+    skcms_Init(&p);
+    skcms_SetTransferFunction(&p, &srgb.trc[0].parametric);
+    skcms_SetXYZD50(&p, &srgb_to_xyz);
+
+    expect(skcms_ApproximatelyEqualProfiles(&p, &srgb));
+}
+
 int main(int argc, char** argv) {
     bool regenTestData = false;
     for (int i = 1; i < argc; ++i) {
@@ -1180,6 +1197,7 @@
     test_AlmostLinear2();
     test_AlmostLinear3();
     test_PrimariesToXYZ();
+    test_Programmatic_sRGB();
 #if 0
     test_CLUT();
 #endif