gecko-dev/widget/src/xpwidgets/GfxInfoBase.cpp

/* vim: se cin sw=2 ts=2 et : */
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#include "GfxInfoBase.h"
#include "GfxInfoWebGL.h"
#include "nsIPrefBranch2.h"
#include "nsIPrefService.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsServiceManagerUtils.h"

using namespace mozilla::widget;

NS_IMPL_ISUPPORTS1(GfxInfoBase, nsIGfxInfo)

#define BLACKLIST_PREF_BRANCH "gfx.blacklist."
#define SUGGESTED_VERSION_PREF BLACKLIST_PREF_BRANCH "suggested-driver-version"

static const char*
GetPrefNameForFeature(PRInt32 aFeature)
{
  const char* name = nsnull;
  switch(aFeature) {
    case nsIGfxInfo::FEATURE_DIRECT2D:
      name = BLACKLIST_PREF_BRANCH "direct2d";
      break;
    case nsIGfxInfo::FEATURE_DIRECT3D_9_LAYERS:
      name = BLACKLIST_PREF_BRANCH "layers.direct3d9";
      break;
    case nsIGfxInfo::FEATURE_DIRECT3D_10_LAYERS:
      name = BLACKLIST_PREF_BRANCH "layers.direct3d10";
      break;
    case nsIGfxInfo::FEATURE_DIRECT3D_10_1_LAYERS:
      name = BLACKLIST_PREF_BRANCH "layers.direct3d10-1";
      break;
    case nsIGfxInfo::FEATURE_OPENGL_LAYERS:
      name = BLACKLIST_PREF_BRANCH "layers.opengl";
      break;
    case nsIGfxInfo::FEATURE_WEBGL_OPENGL:
      name = BLACKLIST_PREF_BRANCH "webgl.opengl";
      break;
    case nsIGfxInfo::FEATURE_WEBGL_ANGLE:
      name = BLACKLIST_PREF_BRANCH "webgl.angle";
      break;
    default:
      break;
  };

  return name;
}

// Returns the value of the pref for the relevant feature in aValue.
// If the pref doesn't exist, aValue is not touched, and returns false.
static bool
GetPrefValueForFeature(PRInt32 aFeature, PRInt32& aValue)
{
  const char *prefname = GetPrefNameForFeature(aFeature);
  if (!prefname)
    return false;

  nsCOMPtr<nsIPrefBranch2> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
  if (prefs) {
    PRInt32 val;
    if (NS_SUCCEEDED(prefs->GetIntPref(prefname, &val))) {
      aValue = val;
      return true;
    }
  }

  return false;
}

static void
SetPrefValueForFeature(PRInt32 aFeature, PRInt32 aValue)
{
  const char *prefname = GetPrefNameForFeature(aFeature);
  if (!prefname)
    return;

  nsCOMPtr<nsIPrefBranch2> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
  if (prefs) {
    prefs->SetIntPref(prefname, aValue);
  }
}

static void
RemovePrefForFeature(PRInt32 aFeature)
{
  const char *prefname = GetPrefNameForFeature(aFeature);
  if (!prefname)
    return;

  nsCOMPtr<nsIPrefBranch2> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
  if (prefs) {
    prefs->ClearUserPref(prefname);
  }
}

static bool
GetPrefValueForDriverVersion(nsACString& aVersion)
{
  nsCOMPtr<nsIPrefBranch2> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
  if (prefs) {
    nsXPIDLCString version;
    if (NS_SUCCEEDED(prefs->GetCharPref(SUGGESTED_VERSION_PREF,
                                        getter_Copies(version)))) {
      aVersion = version;
      return true;
    }
  }

  return false;
}

static void
SetPrefValueForDriverVersion(const nsAString& aVersion)
{
  nsCOMPtr<nsIPrefBranch2> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
  if (prefs) {
    nsCAutoString ver = NS_LossyConvertUTF16toASCII(aVersion);
    prefs->SetCharPref(SUGGESTED_VERSION_PREF,
                       PromiseFlatCString(ver).get());
  }
}

static void
RemovePrefForDriverVersion()
{
  nsCOMPtr<nsIPrefBranch2> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
  if (prefs) {
    prefs->ClearUserPref(SUGGESTED_VERSION_PREF);
  }
}

NS_IMETHODIMP
GfxInfoBase::GetFeatureStatus(PRInt32 aFeature, PRInt32* aStatus NS_OUTPARAM)
{
  if (GetPrefValueForFeature(aFeature, *aStatus))
    return NS_OK;

  nsString version;
  return GetFeatureStatusImpl(aFeature, aStatus, version);
}

NS_IMETHODIMP
GfxInfoBase::GetFeatureSuggestedDriverVersion(PRInt32 aFeature,
                                              nsAString& aVersion NS_OUTPARAM)
{
  nsCString version;
  if (GetPrefValueForDriverVersion(version)) {
    aVersion = NS_ConvertASCIItoUTF16(version);
    return NS_OK;
  }

  PRInt32 status;
  return GetFeatureStatusImpl(aFeature, &status, aVersion);
}


NS_IMETHODIMP
GfxInfoBase::GetWebGLParameter(const nsAString& aParam,
                               nsAString& aResult NS_OUTPARAM)
{
  return GfxInfoWebGL::GetWebGLParameter(aParam, aResult);
}