commit 9580146f5076aaa7c498f86bd3d724c00599f6f4
author John Reck <jreck@google.com> Thu Sep 01 09:44:09 2016 -0700
committer John Reck <jreck@google.com> Wed Sep 07 11:41:15 2016 -0700
tree 33df26fef261fe9ce563b20438726e0094d3c583
parent 51c1b3466acfb77c14ee5332ff1ff2a273af4670

Add API to copy a window

Change-Id: I9bb5209010db6665be4b6f8db81a6fc1b7debc45

libs/hwui/Readback.cpp

diff --git a/libs/hwui/Readback.cpp b/libs/hwui/Readback.cpp
index 65a8ebb..ddca122 100644
--- a/libs/hwui/Readback.cpp
+++ b/libs/hwui/Readback.cpp
@@ -32,7 +32,8 @@
 namespace uirenderer {
 
 static CopyResult copyTextureInto(Caches& caches, RenderState& renderState,
-        Texture& sourceTexture, Matrix4& texTransform, SkBitmap* bitmap) {
+        Texture& sourceTexture, Matrix4& texTransform, const Rect& srcRect,
+        SkBitmap* bitmap) {
     int destWidth = bitmap->width();
     int destHeight = bitmap->height();
     if (destWidth > caches.maxTextureSize
@@ -100,11 +101,19 @@
         renderState.blend().syncEnabled();
         renderState.stencil().disable();
 
+        Matrix4 croppedTexTransform(texTransform);
+        if (!srcRect.isEmpty()) {
+            croppedTexTransform.loadTranslate(srcRect.left / sourceTexture.width(),
+                    srcRect.top / sourceTexture.height(), 0);
+            croppedTexTransform.scale(srcRect.getWidth() / sourceTexture.width(),
+                    srcRect.getHeight() / sourceTexture.height(), 1);
+            croppedTexTransform.multiply(texTransform);
+        }
         Glop glop;
         GlopBuilder(renderState, caches, &glop)
                 .setRoundRectClipState(nullptr)
                 .setMeshTexturedUnitQuad(nullptr)
-                .setFillExternalTexture(sourceTexture, texTransform)
+                .setFillExternalTexture(sourceTexture, croppedTexTransform)
                 .setTransform(Matrix4::identity(), TransformFlags::None)
                 .setModelViewMapUnitToRect(Rect(destWidth, destHeight))
                 .build();
@@ -126,7 +135,8 @@
 }
 
 CopyResult Readback::copySurfaceInto(renderthread::RenderThread& renderThread,
-        Surface& surface, SkBitmap* bitmap) {
+        Surface& surface, const Rect& srcRect, SkBitmap* bitmap) {
+    ATRACE_CALL();
     renderThread.eglManager().initialize();
 
     Caches& caches = Caches::getInstance();
@@ -190,7 +200,7 @@
             sourceBuffer->getWidth(), sourceBuffer->getHeight(), 0 /* total lie */);
 
     CopyResult copyResult = copyTextureInto(caches, renderThread.renderState(),
-            sourceTexture, texTransform, bitmap);
+            sourceTexture, texTransform, srcRect, bitmap);
     sourceTexture.deleteTexture();
     // All we're flushing & finishing is the deletion of the texture since
     // copyTextureInto already did a major flush & finish as an implicit
@@ -202,8 +212,9 @@
 
 CopyResult Readback::copyTextureLayerInto(renderthread::RenderThread& renderThread,
         Layer& layer, SkBitmap* bitmap) {
+    ATRACE_CALL();
     return copyTextureInto(Caches::getInstance(), renderThread.renderState(),
-            layer.getTexture(), layer.getTexTransform(), bitmap);
+            layer.getTexture(), layer.getTexTransform(), Rect(), bitmap);
 }
 
 } // namespace uirenderer