graphics_utils.cpp revision 165a43df7df4aa5121697893c31b9571492939bc
1/* 2 * Copyright (C) 2012 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// Provides a webviewchromium glue layer adapter from the internal Android 18// graphics types into the types the chromium stack expects, and back. 19 20#define LOG_TAG "webviewchromium_plat_support" 21 22#include "draw_gl.h" 23#include "draw_sw.h" 24 25#include <cstdlib> 26#include <jni.h> 27#include <utils/Log.h> 28#include "graphic_buffer_impl.h" 29#include "GraphicsJNI.h" 30#include "SkCanvasStateUtils.h" 31#include "SkGraphics.h" 32#include "SkPicture.h" 33 34#define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0]))) 35 36namespace android { 37namespace { 38 39class PixelInfo : public AwPixelInfo { 40 public: 41 PixelInfo(SkCanvas* canvas); 42 ~PixelInfo(); 43}; 44 45 46PixelInfo::PixelInfo(SkCanvas* canvas) { 47 memset(this, 0, sizeof(AwPixelInfo)); 48 version = kAwPixelInfoVersion; 49 state = SkCanvasStateUtils::CaptureCanvasState(canvas); 50} 51 52PixelInfo::~PixelInfo() { 53 if (state) 54 SkCanvasStateUtils::ReleaseCanvasState(state); 55} 56 57AwPixelInfo* GetPixels(JNIEnv* env, jobject java_canvas) { 58 android::Canvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, java_canvas); 59 if (!nativeCanvas) 60 return NULL; 61 62 SkCanvas* canvas = nativeCanvas->asSkCanvas(); 63 if (!canvas) 64 return NULL; 65 66 // Workarounds for http://crbug.com/271096: SW draw only supports 67 // translate & scale transforms, and a simple rectangular clip. 68 // (This also avoids significant wasted time in calling 69 // SkCanvasStateUtils::CaptureCanvasState when the clip is complex). 70 if (!canvas->isClipRect() || 71 (canvas->getTotalMatrix().getType() & 72 ~(SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask))) { 73 return NULL; 74 } 75 76 PixelInfo* pixels = new PixelInfo(canvas); 77 if (!pixels->state) { 78 delete pixels; 79 pixels = NULL; 80 } 81 return pixels; 82} 83 84void ReleasePixels(AwPixelInfo* pixels) { 85 delete static_cast<PixelInfo*>(pixels); 86} 87 88jlong GetDrawSWFunctionTable(JNIEnv* env, jclass) { 89 static AwDrawSWFunctionTable function_table; 90 function_table.version = kAwDrawSWFunctionTableVersion; 91 function_table.access_pixels = &GetPixels; 92 function_table.release_pixels = &ReleasePixels; 93 return reinterpret_cast<intptr_t>(&function_table); 94} 95 96jlong GetDrawGLFunctionTable(JNIEnv* env, jclass) { 97 static AwDrawGLFunctionTable function_table; 98 function_table.version = kAwDrawGLFunctionTableVersion; 99 function_table.create_graphic_buffer = &GraphicBufferImpl::Create; 100 function_table.release_graphic_buffer = &GraphicBufferImpl::Release; 101 function_table.map = &GraphicBufferImpl::MapStatic; 102 function_table.unmap = &GraphicBufferImpl::UnmapStatic; 103 function_table.get_native_buffer = &GraphicBufferImpl::GetNativeBufferStatic; 104 function_table.get_stride = &GraphicBufferImpl::GetStrideStatic; 105 return reinterpret_cast<intptr_t>(&function_table); 106} 107 108const char kClassName[] = "com/android/webview/chromium/GraphicsUtils"; 109const JNINativeMethod kJniMethods[] = { 110 { "nativeGetDrawSWFunctionTable", "()J", 111 reinterpret_cast<void*>(GetDrawSWFunctionTable) }, 112 { "nativeGetDrawGLFunctionTable", "()J", 113 reinterpret_cast<void*>(GetDrawGLFunctionTable) }, 114}; 115 116} // namespace 117 118void RegisterGraphicsUtils(JNIEnv* env) { 119 jclass clazz = env->FindClass(kClassName); 120 LOG_ALWAYS_FATAL_IF(!clazz, "Unable to find class '%s'", kClassName); 121 122 int res = env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods)); 123 LOG_ALWAYS_FATAL_IF(res < 0, "register native methods failed: res=%d", res); 124} 125 126} // namespace android 127