New widget: TextureView

Bug #4343984

TextureView can be used to render media content (video, OpenGL,
RenderScript) inside a View.

The key difference with SurfaceView is that TextureView does
not create a new Surface. This gives the ability to seamlessly
transform, animate, fade, etc. a TextureView, which was hard
if not impossible to do with a SurfaceView.
A TextureView also interacts perfectly with ScrollView,
ListView, etc. It allows application to embed media content
in a much more flexible way than before.

For instance, to render the camera preview at 50% opacity,
all you need to do is the following:

mTextureView.setAlpha(0.5f);
Camera c = Camera.open();
c.setPreviewTexture(mTextureView.getSurfaceTexture());
c.startPreview();

TextureView uses a SurfaceTexture to get the job done. More
APIs are required to make it easy to create OpenGL contexts
for a TextureView. It can currently be done with a bit of
JNI code.

Change-Id: Iaa7953097ab5beb8437bcbbfa03b2df5b7f80cd7

1 files changed, 13 insertions, 0 deletions

diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index 0276095c98e7..a3e12f671c5b 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -248,6 +248,8 @@ private:
      */
     void composeLayerRect(Layer* layer, const Rect& rect, bool swap = false);
 
+    void drawTextureLayer(Layer* layer, const Rect& rect);
+
     /**
      * Mark the layer as dirty at the specified coordinates. The coordinates
      * are transformed with the supplied matrix.
@@ -400,6 +402,14 @@ private:
     }
 
     /**
+     * Binds the specified EGLImage texture. The texture unit must have been selected
+     * prior to calling this method.
+     */
+    inline void bindExternalTexture(GLuint texture) {
+        glBindTexture(GL_TEXTURE_EXTERNAL_OES, texture);
+    }
+
+    /**
      * Sets the wrap modes for the specified texture. The wrap modes are modified
      * only when needed.
      */
@@ -438,6 +448,7 @@ private:
      * Various methods to setup OpenGL rendering.
      */
     void setupDrawWithTexture(bool isAlpha8 = false);
+    void setupDrawWithExternalTexture();
     void setupDrawAALine();
     void setupDrawPoint(float pointSize);
     void setupDrawColor(int color);
@@ -466,6 +477,8 @@ private:
     void setupDrawColorFilterUniforms();
     void setupDrawSimpleMesh();
     void setupDrawTexture(GLuint texture);
+    void setupDrawExternalTexture(GLuint texture);
+    void setupDrawTextureTransform(mat4& transform);
     void setupDrawMesh(GLvoid* vertices, GLvoid* texCoords = NULL, GLuint vbo = 0);
     void setupDrawVertices(GLvoid* vertices);
     void setupDrawAALine(GLvoid* vertices, GLvoid* distanceCoords, float strokeWidth);