Data and code to measure CopyTextureChromium vs CopyTexImage2D

gistfile1.cpp

Measure time of coping texture by 1000x times between CopyTextureChromium (i.e. GL Drawing) and CopyTexImage2D

Linux (Intel IvyBridge i7-3520M)
   GL Drawing	TexImage2D
	14060	5107
	14110	5568
	14837	5614
	14963	5636
	14997	5713
	15015	5726
	15205	5786
	15434	5807
	15541	5810
	15927	5850
	16029	5884
	16140	5892
	16141	6076
	16458	6084
	16459	6086
	16501	6120
	16699	6188
	16967	6267
	17018	6298
	17144	6732
	17370	6736
	17538	7041
	17616	7555
avg. us	16007.347826087	6068.5217391304
one call takes 16 us vs 6 us. -> 260% faster

Android (Nexus 5)
    GL Drawing	TexImage2D
	208616	157685
	212839	163109
	213974	167021
	240559	186774
	283695	187070
	307009	191004
	309751	191648
	311740	196643
	316058	197462
	318250	218105
	325146	237101
	325744	237386
	326661	257562
	329559	268138
	330081	274138
	331468	274971
	333304	276210
	343436	286782
	348705	295076
	356014	295269
	363481	301604
	373549	303562
	398441	312742
	403329	318381
	440969	334829
	451194	345659
	457643	347749
avg. us	331896.851851852	252728.888888889
one call takes 331.8 us vs 252.7 us. -> 31% faster

diff --git a/content/renderer/media/android/webmediaplayer_android.cc b/content/renderer/media/android/webmediaplayer_android.cc
index 9ebaaae..04b9f93 100644
--- a/content/renderer/media/android/webmediaplayer_android.cc
+++ b/content/renderer/media/android/webmediaplayer_android.cc
@@ -533,6 +533,17 @@ bool WebMediaPlayerAndroid::copyVideoTextureToPlatformTexture(
   web_graphics_context->pixelStorei(GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM,
                                     false);
 
+  uint32 dummy_texture = web_graphics_context->createTexture();
+  web_graphics_context->bindTexture(GL_TEXTURE_2D, dummy_texture);
+  web_graphics_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  web_graphics_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  web_graphics_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  web_graphics_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  web_graphics_context->copyTextureCHROMIUM(GL_TEXTURE_2D, texture,
+                                            dummy_texture, 0, GL_RGBA,
+                                            GL_UNSIGNED_BYTE);
+  web_graphics_context->deleteTexture(dummy_texture);
+
   if (mailbox_holder->texture_target == GL_TEXTURE_EXTERNAL_OES)
     web_graphics_context->bindTexture(GL_TEXTURE_EXTERNAL_OES, 0);
   else
diff --git a/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc b/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
index ab5491e..d823c0d 100644
--- a/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
+++ b/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
@@ -307,7 +307,9 @@ void CopyTextureCHROMIUMResourceManager::Destroy() {
   glDeleteBuffersARB(1, &buffer_id_);
   buffer_id_ = 0;
 }
-
+}
+#include "base/time/time.h"
+namespace gpu {
 void CopyTextureCHROMIUMResourceManager::DoCopyTexture(
     const gles2::GLES2Decoder* decoder,
     GLenum source_target,
@@ -320,10 +322,14 @@ void CopyTextureCHROMIUMResourceManager::DoCopyTexture(
     bool flip_y,
     bool premultiply_alpha,
     bool unpremultiply_alpha) {
+  static int tick = 1;
+  tick++;
   bool premultiply_alpha_change = premultiply_alpha ^ unpremultiply_alpha;
   // GL_TEXTURE_RECTANGLE_ARB on FBO is supported by OpenGL, not GLES2,
   // so restrict this to TEXTURE_2D.
-  if (source_target == GL_TEXTURE_2D && !flip_y && !premultiply_alpha_change) {
+  if (source_target == GL_TEXTURE_2D && !flip_y && !premultiply_alpha_change && (tick % 2)) {
+    base::TimeTicks begin_time = base::TimeTicks::Now();
+    for (int i = 0; i< 1000; i++) {
     DoCopyTexImage2D(decoder,
                      source_target,
                      source_id,
@@ -333,6 +339,9 @@ void CopyTextureCHROMIUMResourceManager::DoCopyTexture(
                      width,
                      height,
                      framebuffer_);
+    }
+    base::TimeDelta delta = base::TimeTicks::Now() - begin_time;
+    LOG(ERROR)<<"DoCopyTexImage2D us:"<<delta.InMicroseconds();
     return;
   }
 
@@ -341,9 +350,14 @@ void CopyTextureCHROMIUMResourceManager::DoCopyTexture(
                                              0.0f, 1.0f, 0.0f, 0.0f,
                                              0.0f, 0.0f, 1.0f, 0.0f,
                                              0.0f, 0.0f, 0.0f, 1.0f};
+  base::TimeTicks begin_time = base::TimeTicks::Now();
+  for (int i = 0; i< 1000; i++) {
   DoCopyTextureWithTransform(decoder, source_target, source_id, dest_id,
       level, internal_format, width, height, flip_y, premultiply_alpha,
       unpremultiply_alpha, default_matrix);
+  }
+  base::TimeDelta delta = base::TimeTicks::Now() - begin_time;
+  LOG(ERROR)<<"DoCopyTexture us:"<<delta.InMicroseconds();
 }
 
 void CopyTextureCHROMIUMResourceManager::DoCopyTextureWithTransform(