DrawFilter.cpp revision 76f6a86de25e1bf74717e047e55fd44b089673f3
1/* libs/android_runtime/android/graphics/ColorFilter.cpp 2** 3** Copyright 2006, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18// This file was generated from the C++ include file: SkColorFilter.h 19// Any changes made to this file will be discarded by the build. 20// To change this file, either edit the include, or device/tools/gluemaker/main.cpp, 21// or one of the auxilary file specifications in device/tools/gluemaker. 22 23#include "jni.h" 24#include "GraphicsJNI.h" 25#include <android_runtime/AndroidRuntime.h> 26 27#include "core_jni_helpers.h" 28 29#include "SkDrawFilter.h" 30#include "SkPaintFlagsDrawFilter.h" 31#include "SkPaint.h" 32 33namespace android { 34 35// Custom version of SkPaintFlagsDrawFilter that also calls setFilterLevel. 36class CompatFlagsDrawFilter : public SkPaintFlagsDrawFilter { 37public: 38 CompatFlagsDrawFilter(uint32_t clearFlags, uint32_t setFlags, 39 SkPaint::FilterLevel desiredLevel) 40 : SkPaintFlagsDrawFilter(clearFlags, setFlags) 41 , fDesiredLevel(desiredLevel) { 42 } 43 44 virtual bool filter(SkPaint* paint, Type type) { 45 SkPaintFlagsDrawFilter::filter(paint, type); 46 paint->setFilterLevel(fDesiredLevel); 47 return true; 48 } 49 50private: 51 const SkPaint::FilterLevel fDesiredLevel; 52}; 53 54// Returns whether flags contains FILTER_BITMAP_FLAG. If flags does, remove it. 55static inline bool hadFiltering(jint& flags) { 56 // Equivalent to the Java Paint's FILTER_BITMAP_FLAG. 57 static const uint32_t sFilterBitmapFlag = 0x02; 58 59 const bool result = (flags & sFilterBitmapFlag) != 0; 60 flags &= ~sFilterBitmapFlag; 61 return result; 62} 63 64class SkDrawFilterGlue { 65public: 66 67 static void finalizer(JNIEnv* env, jobject clazz, jlong objHandle) { 68 SkDrawFilter* obj = reinterpret_cast<SkDrawFilter*>(objHandle); 69 SkSafeUnref(obj); 70 } 71 72 static jlong CreatePaintFlagsDF(JNIEnv* env, jobject clazz, 73 jint clearFlags, jint setFlags) { 74 if (clearFlags | setFlags) { 75 // Mask both groups of flags to remove FILTER_BITMAP_FLAG, which no 76 // longer has a Skia equivalent flag (instead it corresponds to 77 // calling setFilterLevel), and keep track of which group(s), if 78 // any, had the flag set. 79 const bool turnFilteringOn = hadFiltering(setFlags); 80 const bool turnFilteringOff = hadFiltering(clearFlags); 81 82 SkDrawFilter* filter; 83 if (turnFilteringOn) { 84 // Turning filtering on overrides turning it off. 85 filter = new CompatFlagsDrawFilter(clearFlags, setFlags, 86 SkPaint::kLow_FilterLevel); 87 } else if (turnFilteringOff) { 88 filter = new CompatFlagsDrawFilter(clearFlags, setFlags, 89 SkPaint::kNone_FilterLevel); 90 } else { 91 filter = new SkPaintFlagsDrawFilter(clearFlags, setFlags); 92 } 93 return reinterpret_cast<jlong>(filter); 94 } else { 95 return NULL; 96 } 97 } 98}; 99 100static const JNINativeMethod drawfilter_methods[] = { 101 {"nativeDestructor", "(J)V", (void*) SkDrawFilterGlue::finalizer} 102}; 103 104static const JNINativeMethod paintflags_methods[] = { 105 {"nativeConstructor","(II)J", (void*) SkDrawFilterGlue::CreatePaintFlagsDF} 106}; 107 108int register_android_graphics_DrawFilter(JNIEnv* env) { 109 int result = RegisterMethodsOrDie(env, "android/graphics/DrawFilter", drawfilter_methods, 110 NELEM(drawfilter_methods)); 111 result |= RegisterMethodsOrDie(env, "android/graphics/PaintFlagsDrawFilter", paintflags_methods, 112 NELEM(paintflags_methods)); 113 114 return 0; 115} 116 117} 118