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, 18 insertions, 0 deletions

diff --git a/libs/hwui/Layer.h b/libs/hwui/Layer.h
index 6c4a2a9a972d..16566b80164d 100644
--- a/libs/hwui/Layer.h
+++ b/libs/hwui/Layer.h
@@ -45,6 +45,8 @@ struct Layer {
         mesh = NULL;
         meshIndices = NULL;
         meshElementCount = 0;
+        isCacheable = true;
+        isTextureLayer = false;
     }
 
     ~Layer() {
@@ -137,6 +139,22 @@ struct Layer {
     TextureVertex* mesh;
     uint16_t* meshIndices;
     GLsizei meshElementCount;
+
+    /**
+     * If set to true (by default), the layer can be reused.
+     */
+    bool isCacheable;
+
+    /**
+     * When set to true, this layer must be treated as a texture
+     * layer.
+     */
+    bool isTextureLayer;
+
+    /**
+     * Optional texture coordinates transform.
+     */
+    mat4 texTransform;
 }; // struct Layer
 
 }; // namespace uirenderer