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 "draw_gl.h"
23 #include "draw_sw.h"
24
25 #include <cstdlib>
26 #include <jni.h>
27 #include <utils/Log.h>
28 #include "GraphicsJNI.h"
29 #include "graphic_buffer_impl.h"
30 #include "SkCanvasStateUtils.h"
31
32 #define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
33
34 namespace android {
35 namespace {
36
37 class PixelInfo : public AwPixelInfo {
38 public:
39 explicit PixelInfo(android::Canvas* canvas);
40 ~PixelInfo();
41 };
42
43
PixelInfo(android::Canvas * canvas)44 PixelInfo::PixelInfo(android::Canvas* canvas) {
45 memset(this, 0, sizeof(AwPixelInfo));
46 version = kAwPixelInfoVersion;
47 state = canvas->captureCanvasState();
48 }
49
~PixelInfo()50 PixelInfo::~PixelInfo() {
51 if (state)
52 SkCanvasStateUtils::ReleaseCanvasState(state);
53 }
54
GetPixels(JNIEnv * env,jobject java_canvas)55 AwPixelInfo* GetPixels(JNIEnv* env, jobject java_canvas) {
56 android::Canvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, java_canvas);
57 if (!nativeCanvas)
58 return NULL;
59
60 PixelInfo* pixels = new PixelInfo(nativeCanvas);
61 if (!pixels->state) {
62 delete pixels;
63 pixels = NULL;
64 }
65 return pixels;
66 }
67
ReleasePixels(AwPixelInfo * pixels)68 void ReleasePixels(AwPixelInfo* pixels) {
69 delete static_cast<PixelInfo*>(pixels);
70 }
71
GetDrawSWFunctionTable(JNIEnv * env,jclass)72 jlong GetDrawSWFunctionTable(JNIEnv* env, jclass) {
73 static AwDrawSWFunctionTable function_table;
74 function_table.version = kAwDrawSWFunctionTableVersion;
75 function_table.access_pixels = &GetPixels;
76 function_table.release_pixels = &ReleasePixels;
77 return reinterpret_cast<intptr_t>(&function_table);
78 }
79
GetDrawGLFunctionTable(JNIEnv * env,jclass)80 jlong GetDrawGLFunctionTable(JNIEnv* env, jclass) {
81 static AwDrawGLFunctionTable function_table;
82 function_table.version = kAwDrawGLFunctionTableVersion;
83 function_table.create_graphic_buffer = &GraphicBufferImpl::Create;
84 function_table.release_graphic_buffer = &GraphicBufferImpl::Release;
85 function_table.map = &GraphicBufferImpl::MapStatic;
86 function_table.unmap = &GraphicBufferImpl::UnmapStatic;
87 function_table.get_native_buffer = &GraphicBufferImpl::GetNativeBufferStatic;
88 function_table.get_stride = &GraphicBufferImpl::GetStrideStatic;
89 return reinterpret_cast<intptr_t>(&function_table);
90 }
91
92 const char kClassName[] = "com/android/webview/chromium/GraphicsUtils";
93 const JNINativeMethod kJniMethods[] = {
94 { "nativeGetDrawSWFunctionTable", "()J",
95 reinterpret_cast<void*>(GetDrawSWFunctionTable) },
96 { "nativeGetDrawGLFunctionTable", "()J",
97 reinterpret_cast<void*>(GetDrawGLFunctionTable) },
98 };
99
100 } // namespace
101
RegisterGraphicsUtils(JNIEnv * env)102 void RegisterGraphicsUtils(JNIEnv* env) {
103 jclass clazz = env->FindClass(kClassName);
104 LOG_ALWAYS_FATAL_IF(!clazz, "Unable to find class '%s'", kClassName);
105
106 int res = env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods));
107 LOG_ALWAYS_FATAL_IF(res < 0, "register native methods failed: res=%d", res);
108 }
109
110 } // namespace android
111