GLImageEGL: add dmabuf queries

ui/gl/gl_image_egl.cc

Index: ui/gl/gl_image_egl.cc
diff --git a/ui/gl/gl_image_egl.cc b/ui/gl/gl_image_egl.cc
index 181999997ea4cdfd484704ad7b6e0caf27ecd131..841442019e9ac681fe19497cfb48be9caff41e04 100644
--- a/ui/gl/gl_image_egl.cc
+++ b/ui/gl/gl_image_egl.cc
@@ -7,6 +7,10 @@
 #include "ui/gl/egl_util.h"
 #include "ui/gl/gl_surface_egl.h"
 
+#define MAX_FORMATS 100
+#define MAX_MODIFIERS 20
+#define DRM_FORMAT_MOD_NONE 0
+
 namespace gl {
 
 GLImageEGL::GLImageEGL(const gfx::Size& size)
@@ -39,6 +43,30 @@ bool GLImageEGL::Initialize(EGLenum target,
   return true;
 }
 
+std::vector<std::pair<EGLint, EGLuint64KHR>>
+GLImageEGL::GetDmaBufFormatsWithModifiers() {
+  EGLDisplay dpy = GLSurfaceEGL::GetHardwareDisplay();
+  std::vector<std::pair<EGLint, EGLuint64KHR>> supported;
+  EGLint drm_formats[MAX_FORMATS];
+  EGLint num_formats = 0;
+
+  eglQueryDmaBufFormatsEXT(dpy, MAX_FORMATS, &drm_formats[0], &num_formats);
+
+  for (int i = 0; i < num_formats; i++) {
+    EGLuint64KHR drm_modifiers[MAX_MODIFIERS];
+    EGLint num_modifiers = 0;
+
+    eglQueryDmaBufModifiersEXT(dpy, drm_formats[i], MAX_MODIFIERS,
+                               &drm_modifiers[0], NULL, &num_modifiers);
+
+    if (num_modifiers == 0)
+      supported.push_back(std::make_pair(drm_formats[i], DRM_FORMAT_MOD_NONE));
+    for (int j = 0; j < num_modifiers; j++)
+      supported.push_back(std::make_pair(drm_formats[i], drm_modifiers[j]));
+  }
+  return supported;
+}
+
 gfx::Size GLImageEGL::GetSize() {
   return size_;
 }