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->isClipRect() ||
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
GetDrawSWFunctionTable(JNIEnv * env,jclass)84 jlong GetDrawSWFunctionTable(JNIEnv* env, jclass) {
85 static AwDrawSWFunctionTable function_table;
86 function_table.version = kAwDrawSWFunctionTableVersion;
87 function_table.access_pixels = &GetPixels;
88 function_table.release_pixels = &ReleasePixels;
89 return reinterpret_cast<intptr_t>(&function_table);
90 }
91
GetDrawGLFunctionTable(JNIEnv * env,jclass)92 jlong GetDrawGLFunctionTable(JNIEnv* env, jclass) {
93 static AwDrawGLFunctionTable function_table;
94 function_table.version = kAwDrawGLFunctionTableVersion;
95 function_table.create_graphic_buffer = &GraphicBufferImpl::Create;
96 function_table.release_graphic_buffer = &GraphicBufferImpl::Release;
97 function_table.map = &GraphicBufferImpl::MapStatic;
98 function_table.unmap = &GraphicBufferImpl::UnmapStatic;
99 function_table.get_native_buffer = &GraphicBufferImpl::GetNativeBufferStatic;
100 function_table.get_stride = &GraphicBufferImpl::GetStrideStatic;
101 return reinterpret_cast<intptr_t>(&function_table);
102 }
103
104 const char kClassName[] = "com/android/webview/chromium/GraphicsUtils";
105 const JNINativeMethod kJniMethods[] = {
106 { "nativeGetDrawSWFunctionTable", "()J",
107 reinterpret_cast<void*>(GetDrawSWFunctionTable) },
108 { "nativeGetDrawGLFunctionTable", "()J",
109 reinterpret_cast<void*>(GetDrawGLFunctionTable) },
110 };
111
112 } // namespace
113
RegisterGraphicsUtils(JNIEnv * env)114 void RegisterGraphicsUtils(JNIEnv* env) {
115 jclass clazz = env->FindClass(kClassName);
116 LOG_ALWAYS_FATAL_IF(!clazz, "Unable to find class '%s'", kClassName);
117
118 int res = env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods));
119 LOG_ALWAYS_FATAL_IF(res < 0, "register native methods failed: res=%d", res);
120 }
121
122 } // namespace android
123