1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "android_webview/native/java_browser_view_renderer_helper.h"
6
7 #include <android/bitmap.h>
8
9 #include "android_webview/public/browser/draw_sw.h"
10 #include "base/debug/trace_event.h"
11 #include "jni/JavaBrowserViewRendererHelper_jni.h"
12 #include "third_party/skia/include/core/SkBitmap.h"
13 #include "third_party/skia/include/utils/SkCanvasStateUtils.h"
14
15 using base::android::JavaRef;
16 using base::android::ScopedJavaLocalRef;
17
18 namespace android_webview {
19
20 namespace {
21
22 // Provides software rendering functions from the Android glue layer.
23 // Allows preventing extra copies of data when rendering.
24 AwDrawSWFunctionTable* g_sw_draw_functions = NULL;
25
26 class ScopedPixelAccess {
27 public:
ScopedPixelAccess(JNIEnv * env,jobject java_canvas)28 ScopedPixelAccess(JNIEnv* env, jobject java_canvas) : pixels_(NULL) {
29 if (g_sw_draw_functions)
30 pixels_ = g_sw_draw_functions->access_pixels(env, java_canvas);
31 }
32
~ScopedPixelAccess()33 ~ScopedPixelAccess() {
34 if (pixels_)
35 g_sw_draw_functions->release_pixels(pixels_);
36 }
37
pixels()38 AwPixelInfo* pixels() { return pixels_; }
39
40 private:
41 AwPixelInfo* pixels_;
42
43 DISALLOW_IMPLICIT_CONSTRUCTORS(ScopedPixelAccess);
44 };
45
46 } // namespace
47
48 // static
SetAwDrawSWFunctionTable(AwDrawSWFunctionTable * table)49 void JavaBrowserViewRendererHelper::SetAwDrawSWFunctionTable(
50 AwDrawSWFunctionTable* table) {
51 g_sw_draw_functions = table;
52 }
53
54 // static
GetInstance()55 JavaBrowserViewRendererHelper* JavaBrowserViewRendererHelper::GetInstance() {
56 static JavaBrowserViewRendererHelper* g_instance =
57 new JavaBrowserViewRendererHelper;
58 return g_instance;
59 }
60
61 // static
GetInstance()62 BrowserViewRendererJavaHelper* BrowserViewRendererJavaHelper::GetInstance() {
63 return JavaBrowserViewRendererHelper::GetInstance();
64 }
65
JavaBrowserViewRendererHelper()66 JavaBrowserViewRendererHelper::JavaBrowserViewRendererHelper() {}
67
~JavaBrowserViewRendererHelper()68 JavaBrowserViewRendererHelper::~JavaBrowserViewRendererHelper() {}
69
RenderViaAuxilaryBitmapIfNeeded(jobject java_canvas,const gfx::Vector2d & scroll_correction,const gfx::Size & auxiliary_bitmap_size,RenderMethod render_source)70 bool JavaBrowserViewRendererHelper::RenderViaAuxilaryBitmapIfNeeded(
71 jobject java_canvas,
72 const gfx::Vector2d& scroll_correction,
73 const gfx::Size& auxiliary_bitmap_size,
74 RenderMethod render_source) {
75 TRACE_EVENT0("android_webview", "RenderViaAuxilaryBitmapIfNeeded");
76
77 JNIEnv* env = base::android::AttachCurrentThread();
78 ScopedPixelAccess auto_release_pixels(env, java_canvas);
79 AwPixelInfo* pixels = auto_release_pixels.pixels();
80 if (pixels && pixels->state) {
81 skia::RefPtr<SkCanvas> canvas = skia::AdoptRef(
82 SkCanvasStateUtils::CreateFromCanvasState(pixels->state));
83
84 // Workarounds for http://crbug.com/271096: SW draw only supports
85 // translate & scale transforms, and a simple rectangular clip.
86 if (canvas && (!canvas->isClipRect() ||
87 (canvas->getTotalMatrix().getType() &
88 ~(SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask)))) {
89 canvas.clear();
90 }
91 if (canvas) {
92 canvas->translate(scroll_correction.x(), scroll_correction.y());
93 return render_source.Run(canvas.get());
94 }
95 }
96 return RenderViaAuxilaryBitmap(env,
97 java_canvas,
98 scroll_correction,
99 auxiliary_bitmap_size,
100 render_source);
101 }
102
RenderViaAuxilaryBitmap(JNIEnv * env,jobject java_canvas,const gfx::Vector2d & scroll_correction,const gfx::Size & auxiliary_bitmap_size,const RenderMethod & render_source)103 bool JavaBrowserViewRendererHelper::RenderViaAuxilaryBitmap(
104 JNIEnv* env,
105 jobject java_canvas,
106 const gfx::Vector2d& scroll_correction,
107 const gfx::Size& auxiliary_bitmap_size,
108 const RenderMethod& render_source) {
109 // Render into an auxiliary bitmap if pixel info is not available.
110 ScopedJavaLocalRef<jobject> jcanvas(env, java_canvas);
111 TRACE_EVENT0("android_webview", "RenderToAuxBitmap");
112
113 if (auxiliary_bitmap_size.width() <= 0 || auxiliary_bitmap_size.height() <= 0)
114 return false;
115
116 ScopedJavaLocalRef<jobject> jbitmap(
117 Java_JavaBrowserViewRendererHelper_createBitmap(
118 env,
119 auxiliary_bitmap_size.width(),
120 auxiliary_bitmap_size.height(),
121 jcanvas.obj()));
122 if (!jbitmap.obj())
123 return false;
124
125 if (!RasterizeIntoBitmap(env,
126 jbitmap,
127 render_source)) {
128 return false;
129 }
130
131 Java_JavaBrowserViewRendererHelper_drawBitmapIntoCanvas(
132 env,
133 jbitmap.obj(),
134 jcanvas.obj(),
135 scroll_correction.x(),
136 scroll_correction.y());
137 return true;
138 }
139
RegisterJavaBrowserViewRendererHelper(JNIEnv * env)140 bool RegisterJavaBrowserViewRendererHelper(JNIEnv* env) {
141 return RegisterNativesImpl(env);
142 }
143
RasterizeIntoBitmap(JNIEnv * env,const JavaRef<jobject> & jbitmap,const JavaBrowserViewRendererHelper::RenderMethod & renderer)144 bool JavaBrowserViewRendererHelper::RasterizeIntoBitmap(
145 JNIEnv* env,
146 const JavaRef<jobject>& jbitmap,
147 const JavaBrowserViewRendererHelper::RenderMethod& renderer) {
148 DCHECK(jbitmap.obj());
149
150 AndroidBitmapInfo bitmap_info;
151 if (AndroidBitmap_getInfo(env, jbitmap.obj(), &bitmap_info) < 0) {
152 LOG(ERROR) << "Error getting java bitmap info.";
153 return false;
154 }
155
156 void* pixels = NULL;
157 if (AndroidBitmap_lockPixels(env, jbitmap.obj(), &pixels) < 0) {
158 LOG(ERROR) << "Error locking java bitmap pixels.";
159 return false;
160 }
161
162 bool succeeded;
163 {
164 SkImageInfo info =
165 SkImageInfo::MakeN32Premul(bitmap_info.width, bitmap_info.height);
166 SkBitmap bitmap;
167 bitmap.installPixels(info, pixels, bitmap_info.stride);
168
169 SkCanvas canvas(bitmap);
170 succeeded = renderer.Run(&canvas);
171 }
172
173 if (AndroidBitmap_unlockPixels(env, jbitmap.obj()) < 0) {
174 LOG(ERROR) << "Error unlocking java bitmap pixels.";
175 return false;
176 }
177
178 return succeeded;
179 }
180
181 } // namespace android_webview
182