1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "GraphicsJNI.h"
18
19 #include "SkColor.h"
20 #include "SkColorSpace.h"
21 #include "SkHalf.h"
22
23 using namespace android;
24
getNativeXYZMatrix(JNIEnv * env,jfloatArray xyzD50)25 static skcms_Matrix3x3 getNativeXYZMatrix(JNIEnv* env, jfloatArray xyzD50) {
26 skcms_Matrix3x3 xyzMatrix;
27 jfloat* array = env->GetFloatArrayElements(xyzD50, NULL);
28 xyzMatrix.vals[0][0] = array[0];
29 xyzMatrix.vals[1][0] = array[1];
30 xyzMatrix.vals[2][0] = array[2];
31 xyzMatrix.vals[0][1] = array[3];
32 xyzMatrix.vals[1][1] = array[4];
33 xyzMatrix.vals[2][1] = array[5];
34 xyzMatrix.vals[0][2] = array[6];
35 xyzMatrix.vals[1][2] = array[7];
36 xyzMatrix.vals[2][2] = array[8];
37 env->ReleaseFloatArrayElements(xyzD50, array, 0);
38 return xyzMatrix;
39 }
40
41 ///////////////////////////////////////////////////////////////////////////////
42
halfToFloat(uint16_t bits)43 static float halfToFloat(uint16_t bits) {
44 #ifdef __ANDROID__ // __fp16 is not defined on non-Android builds
45 __fp16 h;
46 memcpy(&h, &bits, 2);
47 return (float)h;
48 #else
49 return SkHalfToFloat(bits);
50 #endif
51 }
52
convertColorLong(jlong color)53 SkColor4f GraphicsJNI::convertColorLong(jlong color) {
54 if ((color & 0x3f) == 0) {
55 // This corresponds to sRGB, which is treated differently than the rest.
56 uint8_t a = color >> 56 & 0xff;
57 uint8_t r = color >> 48 & 0xff;
58 uint8_t g = color >> 40 & 0xff;
59 uint8_t b = color >> 32 & 0xff;
60 SkColor c = SkColorSetARGB(a, r, g, b);
61 return SkColor4f::FromColor(c);
62 }
63
64 // These match the implementation of android.graphics.Color#red(long) etc.
65 float r = halfToFloat((uint16_t)(color >> 48 & 0xffff));
66 float g = halfToFloat((uint16_t)(color >> 32 & 0xffff));
67 float b = halfToFloat((uint16_t)(color >> 16 & 0xffff));
68 float a = (color >> 6 & 0x3ff) / 1023.0f;
69
70 return SkColor4f{r, g, b, a};
71 }
72
getNativeColorSpace(jlong colorSpaceHandle)73 sk_sp<SkColorSpace> GraphicsJNI::getNativeColorSpace(jlong colorSpaceHandle) {
74 if (colorSpaceHandle == 0) return nullptr;
75 return sk_ref_sp(reinterpret_cast<SkColorSpace*>(colorSpaceHandle));
76 }
77
unref_colorSpace(SkColorSpace * cs)78 static void unref_colorSpace(SkColorSpace* cs) {
79 SkSafeUnref(cs);
80 }
81
ColorSpace_getNativeFinalizer(JNIEnv *,jobject)82 static jlong ColorSpace_getNativeFinalizer(JNIEnv*, jobject) {
83 return static_cast<jlong>(reinterpret_cast<uintptr_t>(&unref_colorSpace));
84 }
85
ColorSpace_creator(JNIEnv * env,jobject,jfloat a,jfloat b,jfloat c,jfloat d,jfloat e,jfloat f,jfloat g,jfloatArray xyzD50)86 static jlong ColorSpace_creator(JNIEnv* env, jobject, jfloat a, jfloat b, jfloat c,
87 jfloat d, jfloat e, jfloat f, jfloat g, jfloatArray xyzD50) {
88 skcms_TransferFunction p;
89 p.a = a;
90 p.b = b;
91 p.c = c;
92 p.d = d;
93 p.e = e;
94 p.f = f;
95 p.g = g;
96 skcms_Matrix3x3 xyzMatrix = getNativeXYZMatrix(env, xyzD50);
97
98 return reinterpret_cast<jlong>(SkColorSpace::MakeRGB(p, xyzMatrix).release());
99 }
100
101 static const JNINativeMethod gColorSpaceRgbMethods[] = {
102 { "nativeGetNativeFinalizer", "()J", (void*)ColorSpace_getNativeFinalizer },
103 { "nativeCreate", "(FFFFFFF[F)J", (void*)ColorSpace_creator }
104 };
105
106 namespace android {
107
register_android_graphics_ColorSpace(JNIEnv * env)108 int register_android_graphics_ColorSpace(JNIEnv* env) {
109 return android::RegisterMethodsOrDie(env, "android/graphics/ColorSpace$Rgb",
110 gColorSpaceRgbMethods, NELEM(gColorSpaceRgbMethods));
111 }
112
113 }; // namespace android
114