graphics_utils.cpp revision 2479270939ee95cbf8f7f1f2f20d7d68b66bb1d2 
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 <UniquePtr.h>
28#include <utils/Log.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
37namespace android {
38namespace {
39
40class PixelInfo : public AwPixelInfo {
41 public:
42  PixelInfo(SkCanvas* canvas);
43  ~PixelInfo();
44};
45
46
47PixelInfo::PixelInfo(SkCanvas* canvas) {
48  memset(this, 0, sizeof(AwPixelInfo));
49  version = kAwPixelInfoVersion;
50  state = SkCanvasStateUtils::CaptureCanvasState(canvas);
51}
52
53PixelInfo::~PixelInfo() {
54  if (state)
55    SkCanvasStateUtils::ReleaseCanvasState(state);
56}
57
58AwPixelInfo* GetPixels(JNIEnv* env, jobject java_canvas) {
59  SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, java_canvas);
60  if (!canvas)
61    return NULL;
62
63  UniquePtr<PixelInfo> pixels(new PixelInfo(canvas));
64  return pixels->state ? pixels.release() : NULL;
65}
66
67void ReleasePixels(AwPixelInfo* pixels) {
68  delete static_cast<PixelInfo*>(pixels);
69}
70
71jobject CreatePicture(JNIEnv* env, SkPicture* picture) {
72  jclass clazz = env->FindClass("android/graphics/Picture");
73  jmethodID constructor = env->GetMethodID(clazz, "<init>", "(IZ)V");
74  ALOG_ASSERT(clazz);
75  ALOG_ASSERT(constructor);
76  return env->NewObject(clazz, constructor, picture, false);
77}
78
79bool IsSkiaVersionCompatible(SkiaVersionFunction function) {
80  bool compatible = false;
81  if (function && function == &SkGraphics::GetVersion) {
82    int android_major, android_minor, android_patch;
83    SkGraphics::GetVersion(&android_major, &android_minor, &android_patch);
84
85    int chromium_major, chromium_minor, chromium_patch;
86    (*function)(&chromium_major, &chromium_minor, &chromium_patch);
87
88    compatible = android_major == chromium_major &&
89                 android_minor == chromium_minor &&
90                 android_patch == chromium_patch;
91  }
92  return compatible;
93}
94
95jint GetDrawSWFunctionTable(JNIEnv* env, jclass) {
96  static const AwDrawSWFunctionTable function_table = {
97      &GetPixels,
98      &ReleasePixels,
99      &CreatePicture,
100      &IsSkiaVersionCompatible,
101  };
102  return reinterpret_cast<jint>(&function_table);
103}
104
105jint GetDrawGLFunctionTable(JNIEnv* env, jclass) {
106  static const AwDrawGLFunctionTable function_table = {
107    &GraphicBufferImpl::Create,
108    &GraphicBufferImpl::Release,
109    &GraphicBufferImpl::MapStatic,
110    &GraphicBufferImpl::UnmapStatic,
111    &GraphicBufferImpl::GetNativeBufferStatic,
112    &GraphicBufferImpl::GetStrideStatic,
113  };
114  return reinterpret_cast<jint>(&function_table);
115}
116
117const char kClassName[] = "com/android/webview/chromium/GraphicsUtils";
118const JNINativeMethod kJniMethods[] = {
119    { "nativeGetDrawSWFunctionTable", "()I",
120        reinterpret_cast<void*>(GetDrawSWFunctionTable) },
121    { "nativeGetDrawGLFunctionTable", "()I",
122        reinterpret_cast<void*>(GetDrawGLFunctionTable) },
123};
124
125}  // namespace
126
127void RegisterGraphicsUtils(JNIEnv* env) {
128  jclass clazz = env->FindClass(kClassName);
129  LOG_ALWAYS_FATAL_IF(!clazz, "Unable to find class '%s'", kClassName);
130
131  int res = env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods));
132  LOG_ALWAYS_FATAL_IF(res < 0, "register native methods failed: res=%d", res);
133}
134
135}  // namespace android
136