Home | History | Annotate | Download | only in plat_support 
      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 <utils/UniquePtr.h>
     29 #include "graphic_buffer_impl.h"
     30 #include "GraphicsJNI.h"
     31 #include "SkCanvasStateUtils.h"
     32 #include "SkGraphics.h"
     33 #include "SkPicture.h"
     34 
     35 #define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
     36 
     37 namespace android {
     38 namespace {
     39 
     40 class PixelInfo : public AwPixelInfo {
     41  public:
     42   PixelInfo(SkCanvas* canvas);
     43   ~PixelInfo();
     44 };
     45 
     46 
     47 PixelInfo::PixelInfo(SkCanvas* canvas) {
     48   memset(this, 0, sizeof(AwPixelInfo));
     49   version = kAwPixelInfoVersion;
     50   state = SkCanvasStateUtils::CaptureCanvasState(canvas);
     51 }
     52 
     53 PixelInfo::~PixelInfo() {
     54   if (state)
     55     SkCanvasStateUtils::ReleaseCanvasState(state);
     56 }
     57 
     58 AwPixelInfo* GetPixels(JNIEnv* env, jobject java_canvas) {
     59   SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, java_canvas);
     60   if (!canvas)
     61     return NULL;
     62 
     63   // Workarounds for http://crbug.com/271096: SW draw only supports
     64   // translate & scale transforms, and a simple rectangular clip.
     65   // (This also avoids significant wasted time in calling
     66   // SkCanvasStateUtils::CaptureCanvasState when the clip is complex).
     67   if (!canvas->getTotalClip().isRect() ||
     68       (canvas->getTotalMatrix().getType() &
     69                 ~(SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask))) {
     70     return NULL;
     71   }
     72 
     73   UniquePtr<PixelInfo> pixels(new PixelInfo(canvas));
     74   return pixels->state ? pixels.release() : NULL;
     75 }
     76 
     77 void ReleasePixels(AwPixelInfo* pixels) {
     78   delete static_cast<PixelInfo*>(pixels);
     79 }
     80 
     81 jobject CreatePicture(JNIEnv* env, SkPicture* picture) {
     82   jclass clazz = env->FindClass("android/graphics/Picture");
     83   jmethodID constructor = env->GetMethodID(clazz, "<init>", "(IZ)V");
     84   ALOG_ASSERT(clazz);
     85   ALOG_ASSERT(constructor);
     86   return env->NewObject(clazz, constructor, picture, false);
     87 }
     88 
     89 bool IsSkiaVersionCompatible(SkiaVersionFunction function) {
     90   bool compatible = false;
     91   if (function && function == &SkGraphics::GetVersion) {
     92     int android_major, android_minor, android_patch;
     93     SkGraphics::GetVersion(&android_major, &android_minor, &android_patch);
     94 
     95     int chromium_major, chromium_minor, chromium_patch;
     96     (*function)(&chromium_major, &chromium_minor, &chromium_patch);
     97 
     98     compatible = android_major == chromium_major &&
     99                  android_minor == chromium_minor &&
    100                  android_patch == chromium_patch;
    101   }
    102   return compatible;
    103 }
    104 
    105 jint GetDrawSWFunctionTable(JNIEnv* env, jclass) {
    106   static const AwDrawSWFunctionTable function_table = {
    107       &GetPixels,
    108       &ReleasePixels,
    109       &CreatePicture,
    110       &IsSkiaVersionCompatible,
    111   };
    112   return reinterpret_cast<jint>(&function_table);
    113 }
    114 
    115 jint GetDrawGLFunctionTable(JNIEnv* env, jclass) {
    116   static const AwDrawGLFunctionTable function_table = {
    117     &GraphicBufferImpl::Create,
    118     &GraphicBufferImpl::Release,
    119     &GraphicBufferImpl::MapStatic,
    120     &GraphicBufferImpl::UnmapStatic,
    121     &GraphicBufferImpl::GetNativeBufferStatic,
    122     &GraphicBufferImpl::GetStrideStatic,
    123   };
    124   return reinterpret_cast<jint>(&function_table);
    125 }
    126 
    127 const char kClassName[] = "com/android/webview/chromium/GraphicsUtils";
    128 const JNINativeMethod kJniMethods[] = {
    129     { "nativeGetDrawSWFunctionTable", "()I",
    130         reinterpret_cast<void*>(GetDrawSWFunctionTable) },
    131     { "nativeGetDrawGLFunctionTable", "()I",
    132         reinterpret_cast<void*>(GetDrawGLFunctionTable) },
    133 };
    134 
    135 }  // namespace
    136 
    137 void RegisterGraphicsUtils(JNIEnv* env) {
    138   jclass clazz = env->FindClass(kClassName);
    139   LOG_ALWAYS_FATAL_IF(!clazz, "Unable to find class '%s'", kClassName);
    140 
    141   int res = env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods));
    142   LOG_ALWAYS_FATAL_IF(res < 0, "register native methods failed: res=%d", res);
    143 }
    144 
    145 }  // namespace android
    146