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      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 "android_webview/public/browser/draw_gl.h"
     23 #include "android_webview/public/browser/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 
     36 namespace android {
     37 namespace {
     38 
     39 class PixelInfo : public AwPixelInfo {
     40  public:
     41   PixelInfo(SkCanvas* canvas);
     42   ~PixelInfo();
     43 };
     44 
     45 
     46 PixelInfo::PixelInfo(SkCanvas* canvas) {
     47   memset(this, 0, sizeof(AwPixelInfo));
     48   version = kAwPixelInfoVersion;
     49   state = SkCanvasStateUtils::CaptureCanvasState(canvas);
     50 }
     51 
     52 PixelInfo::~PixelInfo() {
     53   if (state)
     54     SkCanvasStateUtils::ReleaseCanvasState(state);
     55 }
     56 
     57 AwPixelInfo* GetPixels(JNIEnv* env, jobject java_canvas) {
     58   SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, java_canvas);
     59   if (!canvas)
     60     return NULL;
     61 
     62   // Workarounds for http://crbug.com/271096: SW draw only supports
     63   // translate & scale transforms, and a simple rectangular clip.
     64   // (This also avoids significant wasted time in calling
     65   // SkCanvasStateUtils::CaptureCanvasState when the clip is complex).
     66   if (!canvas->isClipRect() ||
     67       (canvas->getTotalMatrix().getType() &
     68                 ~(SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask))) {
     69     return NULL;
     70   }
     71 
     72   PixelInfo* pixels = new PixelInfo(canvas);
     73   if (!pixels->state) {
     74       delete pixels;
     75       pixels = NULL;
     76   }
     77   return pixels;
     78 }
     79 
     80 void ReleasePixels(AwPixelInfo* pixels) {
     81   delete static_cast<PixelInfo*>(pixels);
     82 }
     83 
     84 jlong GetDrawSWFunctionTable(JNIEnv* env, jclass) {
     85   static AwDrawSWFunctionTable function_table;
     86   function_table.version = kAwDrawSWFunctionTableVersion;
     87   function_table.access_pixels = &GetPixels;
     88   function_table.release_pixels = &ReleasePixels;
     89   return reinterpret_cast<intptr_t>(&function_table);
     90 }
     91 
     92 jlong GetDrawGLFunctionTable(JNIEnv* env, jclass) {
     93   static AwDrawGLFunctionTable function_table;
     94   function_table.version = kAwDrawGLFunctionTableVersion;
     95   function_table.create_graphic_buffer = &GraphicBufferImpl::Create;
     96   function_table.release_graphic_buffer = &GraphicBufferImpl::Release;
     97   function_table.map = &GraphicBufferImpl::MapStatic;
     98   function_table.unmap = &GraphicBufferImpl::UnmapStatic;
     99   function_table.get_native_buffer = &GraphicBufferImpl::GetNativeBufferStatic;
    100   function_table.get_stride = &GraphicBufferImpl::GetStrideStatic;
    101   return reinterpret_cast<intptr_t>(&function_table);
    102 }
    103 
    104 const char kClassName[] = "com/android/webview/chromium/GraphicsUtils";
    105 const JNINativeMethod kJniMethods[] = {
    106     { "nativeGetDrawSWFunctionTable", "()J",
    107         reinterpret_cast<void*>(GetDrawSWFunctionTable) },
    108     { "nativeGetDrawGLFunctionTable", "()J",
    109         reinterpret_cast<void*>(GetDrawGLFunctionTable) },
    110 };
    111 
    112 }  // namespace
    113 
    114 void RegisterGraphicsUtils(JNIEnv* env) {
    115   jclass clazz = env->FindClass(kClassName);
    116   LOG_ALWAYS_FATAL_IF(!clazz, "Unable to find class '%s'", kClassName);
    117 
    118   int res = env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods));
    119   LOG_ALWAYS_FATAL_IF(res < 0, "register native methods failed: res=%d", res);
    120 }
    121 
    122 }  // namespace android
    123