Add lock/unlockCanvas to TextureView

With this change, TextureView has feature parity with SurfaceView.

Change-Id: I4ef2da33420fc9590f868636ae72a5a6de61965b

1 files changed, 187 insertions, 1 deletions

diff --git a/core/jni/android_view_TextureView.cpp b/core/jni/android_view_TextureView.cpp
index b046b23..9484c6b 100644
--- a/core/jni/android_view_TextureView.cpp
+++ b/core/jni/android_view_TextureView.cpp
@@ -19,11 +19,48 @@
 #include <android_runtime/AndroidRuntime.h>
 #include <android_runtime/android_graphics_SurfaceTexture.h>
 
+#include <ui/Region.h>
+#include <ui/Rect.h>
+
 #include <gui/SurfaceTexture.h>
+#include <gui/SurfaceTextureClient.h>
+
+#include <SkBitmap.h>
+#include <SkCanvas.h>
 
 namespace android {
 
 // ----------------------------------------------------------------------------
+// JNI Glue
+// ----------------------------------------------------------------------------
+
+static struct {
+    jmethodID set;
+    jfieldID left;
+    jfieldID top;
+    jfieldID right;
+    jfieldID bottom;
+} gRectClassInfo;
+
+static struct {
+    jfieldID nativeCanvas;
+    jfieldID surfaceFormat;
+} gCanvasClassInfo;
+
+static struct {
+    jfieldID nativeWindow;
+} gTextureViewClassInfo;
+
+#define GET_INT(object, field) \
+    env->GetIntField(object, field)
+
+#define SET_INT(object, field, value) \
+    env->SetIntField(object, field, value)
+
+#define INVOKEV(object, method, ...) \
+    env->CallVoidMethod(object, method, __VA_ARGS__)
+
+// ----------------------------------------------------------------------------
 // Native layer
 // ----------------------------------------------------------------------------
 
@@ -34,6 +71,118 @@ static void android_view_TextureView_setDefaultBufferSize(JNIEnv* env, jobject,
     surfaceTexture->setDefaultBufferSize(width, height);
 }
 
+static inline SkBitmap::Config convertPixelFormat(int32_t format) {
+    switch (format) {
+        case WINDOW_FORMAT_RGBA_8888:
+            return SkBitmap::kARGB_8888_Config;
+        case WINDOW_FORMAT_RGBX_8888:
+            return SkBitmap::kARGB_8888_Config;
+        case WINDOW_FORMAT_RGB_565:
+            return SkBitmap::kRGB_565_Config;
+        default:
+            return SkBitmap::kNo_Config;
+    }
+}
+
+/**
+ * This is a private API, and this implementation is also provided in the NDK.
+ * However, the NDK links against android_runtime, which means that using the
+ * NDK implementation would create a circular dependency between the libraries.
+ */
+static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
+        Rect* inOutDirtyBounds) {
+    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
+}
+
+static int32_t native_window_unlockAndPost(ANativeWindow* window) {
+    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
+}
+
+static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
+        jobject surface) {
+
+    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, surface));
+    sp<ANativeWindow> window = new SurfaceTextureClient(surfaceTexture);
+
+    window->incStrong(0);
+    SET_INT(textureView, gTextureViewClassInfo.nativeWindow, jint(window.get()));
+}
+
+static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
+
+    ANativeWindow* nativeWindow = (ANativeWindow*)
+            GET_INT(textureView, gTextureViewClassInfo.nativeWindow);
+
+    if (nativeWindow) {
+        sp<ANativeWindow> window(nativeWindow);
+            window->decStrong(0);
+        SET_INT(textureView, gTextureViewClassInfo.nativeWindow, 0);
+    }
+}
+
+static void android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
+        jint nativeWindow, jobject canvas, jobject dirtyRect) {
+
+    if (!nativeWindow) {
+        return;
+    }
+
+    ANativeWindow_Buffer buffer;
+
+    Rect rect;
+    if (dirtyRect) {
+        rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
+        rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
+        rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
+        rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
+    } else {
+        rect.set(Rect(0x3FFF, 0x3FFF));
+    }
+
+    sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
+    native_window_lock(window.get(), &buffer, &rect);
+
+    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
+
+    SkBitmap bitmap;
+    bitmap.setConfig(convertPixelFormat(buffer.format), buffer.width, buffer.height, bytesCount);
+
+    if (buffer.format == WINDOW_FORMAT_RGBX_8888) {
+        bitmap.setIsOpaque(true);
+    }
+
+    if (buffer.width > 0 && buffer.height > 0) {
+        bitmap.setPixels(buffer.bits);
+    } else {
+        bitmap.setPixels(NULL);
+    }
+
+    SET_INT(canvas, gCanvasClassInfo.surfaceFormat, buffer.format);
+    SkCanvas* nativeCanvas = (SkCanvas*) GET_INT(canvas, gCanvasClassInfo.nativeCanvas);
+    nativeCanvas->setBitmapDevice(bitmap);
+
+    SkRect clipRect;
+    clipRect.set(rect.left, rect.top, rect.right, rect.bottom);
+    nativeCanvas->clipRect(clipRect);
+
+    if (dirtyRect) {
+        INVOKEV(dirtyRect, gRectClassInfo.set,
+                int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
+    }
+}
+
+static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
+        jint nativeWindow, jobject canvas) {
+
+    SkCanvas* nativeCanvas = (SkCanvas*) GET_INT(canvas, gCanvasClassInfo.nativeCanvas);
+    nativeCanvas->setBitmapDevice(SkBitmap());
+
+    if (nativeWindow) {
+        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
+        native_window_unlockAndPost(window.get());
+    }
+}
+
 // ----------------------------------------------------------------------------
 // JNI Glue
 // ----------------------------------------------------------------------------
@@ -42,10 +191,47 @@ const char* const kClassPathName = "android/view/TextureView";
 
 static JNINativeMethod gMethods[] = {
     {   "nSetDefaultBufferSize", "(Landroid/graphics/SurfaceTexture;II)V",
-            (void*) android_view_TextureView_setDefaultBufferSize }
+            (void*) android_view_TextureView_setDefaultBufferSize },
+
+    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
+            (void*) android_view_TextureView_createNativeWindow },
+    {   "nDestroyNativeWindow", "()V",
+            (void*) android_view_TextureView_destroyNativeWindow },
+
+    {   "nLockCanvas", "(ILandroid/graphics/Canvas;Landroid/graphics/Rect;)V",
+            (void*) android_view_TextureView_lockCanvas },
+    {   "nUnlockCanvasAndPost", "(ILandroid/graphics/Canvas;)V",
+            (void*) android_view_TextureView_unlockCanvasAndPost },
 };
 
+#define FIND_CLASS(var, className) \
+        var = env->FindClass(className); \
+        LOG_FATAL_IF(!var, "Unable to find class " className);
+
+#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
+        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
+        LOG_FATAL_IF(!var, "Unable to find method " methodName);
+
+#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
+        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
+        LOG_FATAL_IF(!var, "Unable to find field" fieldName);
+
 int register_android_view_TextureView(JNIEnv* env) {
+    jclass clazz;
+    FIND_CLASS(clazz, "android/graphics/Rect");
+    GET_METHOD_ID(gRectClassInfo.set, clazz, "set", "(IIII)V");
+    GET_FIELD_ID(gRectClassInfo.left, clazz, "left", "I");
+    GET_FIELD_ID(gRectClassInfo.top, clazz, "top", "I");
+    GET_FIELD_ID(gRectClassInfo.right, clazz, "right", "I");
+    GET_FIELD_ID(gRectClassInfo.bottom, clazz, "bottom", "I");
+
+    FIND_CLASS(clazz, "android/graphics/Canvas");
+    GET_FIELD_ID(gCanvasClassInfo.nativeCanvas, clazz, "mNativeCanvas", "I");
+    GET_FIELD_ID(gCanvasClassInfo.surfaceFormat, clazz, "mSurfaceFormat", "I");
+
+    FIND_CLASS(clazz, "android/view/TextureView");
+    GET_FIELD_ID(gTextureViewClassInfo.nativeWindow, clazz, "mNativeWindow", "I");
+
     return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
 }