[PATCH hwc v2 08/18] drm_hwcomposer: Parse and store possible_clones information

[Alexandru Gheorghe]

drmModeEncoder has a field called possible_clones. It's a bit mask
which tells if the encoder could be simultaneously connected, to the
same CRTC, with the encoders specified in the possible_clones mask.

Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe at arm.com>
---
 drmencoder.cpp   | 8 ++++++++
 drmencoder.h     | 4 ++++
 drmresources.cpp | 9 ++++++++-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drmencoder.cpp b/drmencoder.cpp
index 1da7ec3..ff675f5 100644
--- a/drmencoder.cpp
+++ b/drmencoder.cpp
@@ -39,6 +39,14 @@ DrmCrtc *DrmEncoder::crtc() const {
   return crtc_;
 }
 
+bool DrmEncoder::can_clone(DrmEncoder *encoder) {
+  return possible_clones_.find(encoder) != possible_clones_.end();
+}
+
+void DrmEncoder::add_possible_clone(DrmEncoder *possible_clone) {
+  possible_clones_[possible_clone] = true;
+}
+
 void DrmEncoder::set_crtc(DrmCrtc *crtc) {
   crtc_ = crtc;
   set_display(crtc->display());
diff --git a/drmencoder.h b/drmencoder.h
index 7e06691..5e7c010 100644
--- a/drmencoder.h
+++ b/drmencoder.h
@@ -21,6 +21,7 @@
 
 #include <stdint.h>
 #include <vector>
+#include <map>
 #include <xf86drmMode.h>
 
 namespace android {
@@ -43,6 +44,8 @@ class DrmEncoder {
   const std::vector<DrmCrtc *> &possible_crtcs() const {
     return possible_crtcs_;
   }
+  bool can_clone(DrmEncoder *encoder);
+  void add_possible_clone(DrmEncoder *possible_clone);
 
  private:
   uint32_t id_;
@@ -50,6 +53,7 @@ class DrmEncoder {
   int display_;
 
   std::vector<DrmCrtc *> possible_crtcs_;
+  std::map<DrmEncoder *, bool> possible_clones_;
 };
 }
 
diff --git a/drmresources.cpp b/drmresources.cpp
index a5ddda0..39f50be 100644
--- a/drmresources.cpp
+++ b/drmresources.cpp
@@ -97,6 +97,7 @@ int DrmResources::Init(ResourceManager *resource_manager, char *path,
     crtcs_.emplace_back(std::move(crtc));
   }
 
+  std::vector<int> possible_clones;
   for (int i = 0; !ret && i < res->count_encoders; ++i) {
     drmModeEncoderPtr e = drmModeGetEncoder(fd(), res->encoders[i]);
     if (!e) {
@@ -117,12 +118,18 @@ int DrmResources::Init(ResourceManager *resource_manager, char *path,
 
     std::unique_ptr<DrmEncoder> enc(
         new DrmEncoder(e, current_crtc, possible_crtcs));
-
+    possible_clones.push_back(e->possible_clones);
     drmModeFreeEncoder(e);
 
     encoders_.emplace_back(std::move(enc));
   }
 
+  for (uint32_t i = 0; i < encoders_.size(); i++) {
+    for (uint32_t j = 0; j < encoders_.size(); j++)
+      if (possible_clones[i] & (1 << j))
+        encoders_[i]->add_possible_clone(encoders_[j].get());
+  }
+
   for (int i = 0; !ret && i < res->count_connectors; ++i) {
     drmModeConnectorPtr c = drmModeGetConnector(fd(), res->connectors[i]);
     if (!c) {
-- 
2.7.4