ozone: Allocate scanout buffers according to KMS modifiers.

ui/ozone/platform/drm/gpu/gbm_buffer_base.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/gpu/gbm_buffer_base.h"
 
 #include <gbm.h>
 
 #include "base/logging.h"
 #include "ui/ozone/platform/drm/common/drm_util.h"
 #include "ui/ozone/platform/drm/gpu/gbm_device.h"
 
 namespace ui {
 
 GbmBufferBase::GbmBufferBase(const scoped_refptr<GbmDevice>& drm,
                              gbm_bo* bo,
                              uint32_t format,
-                             uint32_t flags)
+                             uint32_t flags,
+                             uint64_t modifier,
+                             uint32_t addfb_flags)
     : drm_(drm), bo_(bo) {
   if (flags & GBM_BO_USE_SCANOUT) {
     DCHECK(bo_);
     // The framebuffer format might be different than the format:
     // drm supports 24 bit color depth and formats with alpha will
     // be converted to one without it.
     framebuffer_pixel_format_ =
         GetFourCCFormatForFramebuffer(GetBufferFormatFromFourCCFormat(format));
 
     // TODO(dcastagna): Add multi-planar support.
     uint32_t handles[4] = {0};
     handles[0] = gbm_bo_get_handle(bo).u32;
     uint32_t strides[4] = {0};
     strides[0] = gbm_bo_get_stride(bo);
     uint32_t offsets[4] = {0};
+    uint64_t modifiers[4] = {0};
+    modifiers[0] = modifier;
 
+    // AddFramebuffer2 only considers the modifiers if addfb_flags has
+    // DRM_MODE_FB_MODIFIERS set. We only set that when we've created
+    // a bo with modifiers, otherwise, we rely on the "no modifiers"
+    // behavior doing the right thing.
     if (!drm_->AddFramebuffer2(gbm_bo_get_width(bo), gbm_bo_get_height(bo),
                                framebuffer_pixel_format_, handles, strides,
-                               offsets, &framebuffer_, 0)) {
+                               offsets, modifiers, &framebuffer_,
+                               addfb_flags)) {
       PLOG(ERROR) << "Failed to register buffer";
       return;
     }
   }
 }
 
 GbmBufferBase::~GbmBufferBase() {
   if (framebuffer_)
     drm_->RemoveFramebuffer(framebuffer_);
 }
@@ skipping 17 matching lines @@
 
 const DrmDevice* GbmBufferBase::GetDrmDevice() const {
   return drm_.get();
 }
 
 bool GbmBufferBase::RequiresGlFinish() const {
   return !drm_->is_primary_device();
 }
 
 }  // namespace ui