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
PixelInfo(SkCanvas * canvas)46 PixelInfo::PixelInfo(SkCanvas* canvas) {
47 memset(this, 0, sizeof(AwPixelInfo));
48 version = kAwPixelInfoVersion;
49 state = SkCanvasStateUtils::CaptureCanvasState(canvas);
50 }
51
~PixelInfo()52 PixelInfo::~PixelInfo() {
53 if (state)
54 SkCanvasStateUtils::ReleaseCanvasState(state);
55 }
56
GetPixels(JNIEnv * env,jobject java_canvas)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->getTotalClip().isRect() ||
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
ReleasePixels(AwPixelInfo * pixels)80 void ReleasePixels(AwPixelInfo* pixels) {
81 delete static_cast<PixelInfo*>(pixels);
82 }
83
CreatePicture(JNIEnv * env,SkPicture * picture)84 jobject CreatePicture(JNIEnv* env, SkPicture* picture) {
85 jclass clazz = env->FindClass("android/graphics/Picture");
86 jmethodID constructor = env->GetMethodID(clazz, "<init>", "(IZ)V");
87 ALOG_ASSERT(clazz);
88 ALOG_ASSERT(constructor);
89 return env->NewObject(clazz, constructor, picture, false);
90 }
91
IsSkiaVersionCompatible(SkiaVersionFunction function)92 bool IsSkiaVersionCompatible(SkiaVersionFunction function) {
93 bool compatible = false;
94 if (function && function == &SkGraphics::GetVersion) {
95 int android_major, android_minor, android_patch;
96 SkGraphics::GetVersion(&android_major, &android_minor, &android_patch);
97
98 int chromium_major, chromium_minor, chromium_patch;
99 (*function)(&chromium_major, &chromium_minor, &chromium_patch);
100
101 compatible = android_major == chromium_major &&
102 android_minor == chromium_minor &&
103 android_patch == chromium_patch;
104 }
105 return compatible;
106 }
107
GetDrawSWFunctionTable(JNIEnv * env,jclass)108 jint GetDrawSWFunctionTable(JNIEnv* env, jclass) {
109 static const AwDrawSWFunctionTable function_table = {
110 &GetPixels,
111 &ReleasePixels,
112 &CreatePicture,
113 &IsSkiaVersionCompatible,
114 };
115 return reinterpret_cast<jint>(&function_table);
116 }
117
GetDrawGLFunctionTable(JNIEnv * env,jclass)118 jint GetDrawGLFunctionTable(JNIEnv* env, jclass) {
119 static const AwDrawGLFunctionTable function_table = {
120 &GraphicBufferImpl::Create,
121 &GraphicBufferImpl::Release,
122 &GraphicBufferImpl::MapStatic,
123 &GraphicBufferImpl::UnmapStatic,
124 &GraphicBufferImpl::GetNativeBufferStatic,
125 &GraphicBufferImpl::GetStrideStatic,
126 };
127 return reinterpret_cast<jint>(&function_table);
128 }
129
130 const char kClassName[] = "com/android/webview/chromium/GraphicsUtils";
131 const JNINativeMethod kJniMethods[] = {
132 { "nativeGetDrawSWFunctionTable", "()I",
133 reinterpret_cast<void*>(GetDrawSWFunctionTable) },
134 { "nativeGetDrawGLFunctionTable", "()I",
135 reinterpret_cast<void*>(GetDrawGLFunctionTable) },
136 };
137
138 } // namespace
139
RegisterGraphicsUtils(JNIEnv * env)140 void RegisterGraphicsUtils(JNIEnv* env) {
141 jclass clazz = env->FindClass(kClassName);
142 LOG_ALWAYS_FATAL_IF(!clazz, "Unable to find class '%s'", kClassName);
143
144 int res = env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods));
145 LOG_ALWAYS_FATAL_IF(res < 0, "register native methods failed: res=%d", res);
146 }
147
148 } // namespace android
149