graphics_utils.cpp revision a68073f3c0ef06b8a5c0a6c71cf33bc1f37664b9 
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 <utils/Vector.h>
30#include "graphic_buffer_impl.h"
31#include "GraphicsJNI.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, const SkBitmap* bitmap);
43  ~PixelInfo();
44
45  void AddRectToClip(const SkIRect& rect);
46
47 private:
48  const SkBitmap* bitmap_;
49  SkAutoLockPixels bitmap_locker_;
50  Vector<int> clip_rect_storage_;
51};
52
53class ClipValidator : public SkCanvas::ClipVisitor {
54 public:
55  ClipValidator() : failed_(false) {}
56  bool failed() { return failed_; }
57
58  // ClipVisitor
59  virtual void clipRect(const SkRect& rect, SkRegion::Op op, bool antialias) {
60    failed_ |= antialias;
61  }
62
63  virtual void clipPath(const SkPath&, SkRegion::Op, bool antialias) {
64    failed_ |= antialias;
65  }
66
67 private:
68  bool failed_;
69};
70
71PixelInfo::PixelInfo(SkCanvas* canvas, const SkBitmap* bitmap)
72    : bitmap_(bitmap),
73      bitmap_locker_(*bitmap) {
74  memset(this, 0, sizeof(AwPixelInfo));
75  version = kAwPixelInfoVersion;
76}
77
78PixelInfo::~PixelInfo() {}
79
80void PixelInfo::AddRectToClip(const SkIRect& rect) {
81  ALOG_ASSERT(rect.width() >= 0 && rect.height() >= 0);
82  clip_rect_storage_.push_back(rect.x());
83  clip_rect_storage_.push_back(rect.y());
84  clip_rect_storage_.push_back(rect.width());
85  clip_rect_storage_.push_back(rect.height());
86  clip_rects = const_cast<int*>(clip_rect_storage_.array());
87  clip_rect_count = clip_rect_storage_.size() / 4;
88}
89
90PixelInfo* TryToCreatePixelInfo(SkCanvas* canvas) {
91  // Check the clip can decompose into simple rectangles. This validator is
92  // not a perfect guarantee, but it's the closest I can do with the current
93  // API. TODO: compile this out in release builds as currently Java canvases
94  // do not allow for antialiased clip.
95  ClipValidator validator;
96  canvas->replayClips(&validator);
97  if (validator.failed())
98    return NULL;
99
100  SkCanvas::LayerIter layer(SkCanvas::LayerIter(canvas, false));
101  if (layer.done())
102    return NULL;
103  SkDevice* device = layer.device();
104  if (!device)
105    return NULL;
106  const SkBitmap* bitmap = &device->accessBitmap(true);
107  if (!bitmap->lockPixelsAreWritable())
108    return NULL;
109  const SkRegion& region = layer.clip();
110  layer.next();
111  // Currently don't handle multiple layers well, so early out
112  // TODO: Return all layers in PixelInfo
113  if (!layer.done())
114    return NULL;
115
116  UniquePtr<PixelInfo> pixels(new PixelInfo(canvas, bitmap));
117  pixels->config =
118      bitmap->config() == SkBitmap::kARGB_8888_Config ? AwConfig_ARGB_8888 :
119      bitmap->config() == SkBitmap::kARGB_4444_Config ? AwConfig_ARGB_4444 :
120      bitmap->config() == SkBitmap::kRGB_565_Config ? AwConfig_RGB_565 : -1;
121  if (pixels->config < 0)
122    return NULL;
123
124  pixels->width = bitmap->width();
125  pixels->height = bitmap->height();
126  pixels->row_bytes = bitmap->rowBytes();
127  pixels->pixels = bitmap->getPixels();
128  const SkMatrix& matrix = layer.matrix();
129  for (int i = 0; i < 9; i++) {
130    pixels->matrix[i] = matrix.get(i);
131  }
132
133  if (region.isEmpty()) {
134    pixels->AddRectToClip(region.getBounds());
135  } else {
136    SkRegion::Iterator clip_iterator(region);
137    for (; !clip_iterator.done(); clip_iterator.next()) {
138      pixels->AddRectToClip(clip_iterator.rect());
139    }
140  }
141
142  // WebViewClassic used the DrawFilter for its own purposes (e.g. disabling
143  // dithering when zooming/scrolling) so for now at least, just ignore any
144  // client supplied DrawFilter.
145  ALOGW_IF(canvas->getDrawFilter(),
146           "DrawFilter not supported in webviewchromium, will be ignored");
147  return pixels.release();
148}
149
150AwPixelInfo* GetPixels(JNIEnv* env, jobject java_canvas) {
151  SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, java_canvas);
152  if (!canvas)
153    return NULL;
154
155  return TryToCreatePixelInfo(canvas);
156}
157
158void ReleasePixels(AwPixelInfo* pixels) {
159  delete static_cast<PixelInfo*>(pixels);
160}
161
162jobject CreatePicture(JNIEnv* env, SkPicture* picture) {
163  jclass clazz = env->FindClass("android/graphics/Picture");
164  jmethodID constructor = env->GetMethodID(clazz, "<init>", "(IZ)V");
165  ALOG_ASSERT(clazz);
166  ALOG_ASSERT(constructor);
167  return env->NewObject(clazz, constructor, picture, false);
168}
169
170bool IsSkiaVersionCompatible(SkiaVersionFunction function) {
171  bool compatible = false;
172  if (function && function == &SkGraphics::GetVersion) {
173    int android_major, android_minor, android_patch;
174    SkGraphics::GetVersion(&android_major, &android_minor, &android_patch);
175
176    int chromium_major, chromium_minor, chromium_patch;
177    (*function)(&chromium_major, &chromium_minor, &chromium_patch);
178
179    compatible = android_major == chromium_major &&
180                 android_minor == chromium_minor &&
181                 android_patch == chromium_patch;
182  }
183  return compatible;
184}
185
186jint GetDrawSWFunctionTable(JNIEnv* env, jclass) {
187  static const AwDrawSWFunctionTable function_table = {
188      &GetPixels,
189      &ReleasePixels,
190      &CreatePicture,
191      &IsSkiaVersionCompatible,
192  };
193  return reinterpret_cast<jint>(&function_table);
194}
195
196jint GetDrawGLFunctionTable(JNIEnv* env, jclass) {
197  static const AwDrawGLFunctionTable function_table = {
198    &GraphicBufferImpl::Create,
199    &GraphicBufferImpl::Release,
200    &GraphicBufferImpl::MapStatic,
201    &GraphicBufferImpl::UnmapStatic,
202    &GraphicBufferImpl::GetNativeBufferStatic,
203    &GraphicBufferImpl::GetStrideStatic,
204  };
205  return reinterpret_cast<jint>(&function_table);
206}
207
208const char kClassName[] = "com/android/webview/chromium/GraphicsUtils";
209const JNINativeMethod kJniMethods[] = {
210    { "nativeGetDrawSWFunctionTable", "()I",
211        reinterpret_cast<void*>(GetDrawSWFunctionTable) },
212    { "nativeGetDrawGLFunctionTable", "()I",
213        reinterpret_cast<void*>(GetDrawGLFunctionTable) },
214};
215
216}  // namespace
217
218void RegisterGraphicsUtils(JNIEnv* env) {
219  jclass clazz = env->FindClass(kClassName);
220  LOG_ALWAYS_FATAL_IF(!clazz, "Unable to find class '%s'", kClassName);
221
222  int res = env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods));
223  LOG_ALWAYS_FATAL_IF(res < 0, "register native methods failed: res=%d", res);
224}
225
226}  // namespace android
227