Correctly support pre-multiplied alpha, optimizations, more stuff.

Add support for the following drawing functions:
- drawBitmap(int[]...)
- drawPaint()

Optimizes shader state changes by enabling/disabling attribute arrays
only when needed.

Adds quick rejects when drawing trivial shapes to avoid unnecessary
OpenGL operations.

Change-Id: Ic2c6c2ed1523d08a63a8c95601a1ec40b6c7fbc9

1 files changed, 22 insertions, 0 deletions

diff --git a/libs/hwui/Program.cpp b/libs/hwui/Program.cpp
index 3b5e5da0ad18..609b28a4f361 100644
--- a/libs/hwui/Program.cpp
+++ b/libs/hwui/Program.cpp
@@ -146,6 +146,16 @@ void DrawColorProgram::set(const mat4& projectionMatrix, const mat4& modelViewMa
     glUniformMatrix4fv(transform, 1, GL_FALSE, &t.data[0]);
 }
 
+void DrawColorProgram::use() {
+    Program::use();
+    glEnableVertexAttribArray(position);
+}
+
+void DrawColorProgram::remove() {
+    Program::remove();
+    glDisableVertexAttribArray(position);
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // Draw texture
 ///////////////////////////////////////////////////////////////////////////////
@@ -156,5 +166,17 @@ DrawTextureProgram::DrawTextureProgram():
     sampler = addUniform("sampler");
 }
 
+void DrawTextureProgram::use() {
+    DrawColorProgram::use();
+    glActiveTexture(GL_TEXTURE0);
+    glUniform1i(sampler, 0);
+    glEnableVertexAttribArray(texCoords);
+}
+
+void DrawTextureProgram::remove() {
+    DrawColorProgram::remove();
+    glDisableVertexAttribArray(texCoords);
+}
+
 }; // namespace uirenderer
 }; // namespace android