graphics_utils.cpp revision 86abeb66b6f8237f85ccce79495f15ace437a96a 
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  // 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
77void ReleasePixels(AwPixelInfo* pixels) {
78  delete static_cast<PixelInfo*>(pixels);
79}
80
81jobject 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
89bool 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
105jint 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
115jint 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
127const char kClassName[] = "com/android/webview/chromium/GraphicsUtils";
128const JNINativeMethod kJniMethods[] = {
129    { "nativeGetDrawSWFunctionTable", "()I",
130        reinterpret_cast<void*>(GetDrawSWFunctionTable) },
131    { "nativeGetDrawGLFunctionTable", "()I",
132        reinterpret_cast<void*>(GetDrawGLFunctionTable) },
133};
134
135}  // namespace
136
137void 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