Reland linux_aura: Implement most of DesktopScreenX11.

base/x11/edid_parser_x11.cc

 // Copyright (c) 2013 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 "chromeos/display/output_util.h"
+#include "base/x11/edid_parser_x11.h"
 
-#include <X11/Xlib.h>
 #include <X11/extensions/Xrandr.h>
 #include <X11/Xatom.h>
+#include <X11/Xlib.h>
 
 #include "base/hash.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_util.h"
 #include "base/sys_byteorder.h"
 
-namespace chromeos {
 namespace {
 
-// Prefixes for the built-in displays.
-const char kInternal_LVDS[] = "LVDS";
-const char kInternal_eDP[] = "eDP";
-const char kInternal_DSI[] = "DSI";
-
 // Returns 64-bit persistent ID for the specified manufacturer's ID and
 // product_code_hash, and the index of the output it is connected to.
 // |output_index| is used to distinguish the displays of the same type. For
 // example, swapping two identical display between two outputs will not be
 // treated as swap. The 'serial number' field in EDID isn't used here because
 // it is not guaranteed to have unique number and it may have the same fixed
 // value (like 0).
 int64 GetID(uint16 manufacturer_id,
             uint32 product_code_hash,
             uint8 output_index) {
   return ((static_cast<int64>(manufacturer_id) << 40) |
           (static_cast<int64>(product_code_hash) << 8) | output_index);
 }
 
 bool IsRandRAvailable() {
   int randr_version_major = 0;
   int randr_version_minor = 0;
   static bool is_randr_available = XRRQueryVersion(
       base::MessagePumpX11::GetDefaultXDisplay(),
       &randr_version_major, &randr_version_minor);
   return is_randr_available;
 }
 
-// Get the EDID data from the |output| and stores to |prop|. |nitem| will store
-// the number of characters |prop| will have. It doesn't take the ownership of
-// |prop|, so caller must release it by XFree().
-// Returns true if EDID property is successfully obtained. Otherwise returns
-// false and does not touch |prop| and |nitems|.
+}  // namespace
+
+namespace base {
+
 bool GetEDIDProperty(XID output, unsigned long* nitems, unsigned char** prop) {
   if (!IsRandRAvailable())
     return false;
 
   Display* display = base::MessagePumpX11::GetDefaultXDisplay();
 
   static Atom edid_property = XInternAtom(
       base::MessagePumpX11::GetDefaultXDisplay(),
       RR_PROPERTY_RANDR_EDID, false);
 
@@ skipping 24 matching lines @@
                        &actual_type,
                        &actual_format,
                        nitems,
                        &bytes_after,
                        prop);
   DCHECK_EQ(XA_INTEGER, actual_type);
   DCHECK_EQ(8, actual_format);
   return true;
 }
 
-// Gets some useful data from the specified output device, such like
-// manufacturer's ID, product code, and human readable name. Returns false if it
-// fails to get those data and doesn't touch manufacturer ID/product code/name.
-// NULL can be passed for unwanted output parameters.
-bool GetOutputDeviceData(XID output,
-                         uint16* manufacturer_id,
-                         std::string* human_readable_name) {
-  unsigned long nitems = 0;
-  unsigned char *prop = NULL;
-  if (!GetEDIDProperty(output, &nitems, &prop))
-    return false;
-
-  bool result = ParseOutputDeviceData(
-      prop, nitems, manufacturer_id, human_readable_name);
-  XFree(prop);
-  return result;
-}
-
-}  // namespace
-
-std::string GetDisplayName(XID output_id) {
-  std::string display_name;
-  GetOutputDeviceData(output_id, NULL, &display_name);
-  return display_name;
-}
-
 bool GetDisplayId(XID output_id, size_t output_index, int64* display_id_out) {
   unsigned long nitems = 0;
   unsigned char* prop = NULL;
   if (!GetEDIDProperty(output_id, &nitems, &prop))
     return false;
 
   bool result =
       GetDisplayIdFromEDID(prop, nitems, output_index, display_id_out);
   XFree(prop);
   return result;
@@ skipping 87 matching lines @@
     if (!isascii(c) || !isprint(c)) {
       human_readable_name->clear();
       LOG(ERROR) << "invalid EDID: human unreadable char in name";
       return false;
     }
   }
 
   return true;
 }
 
-bool GetOutputOverscanFlag(XID output, bool* flag) {
-  unsigned long nitems = 0;
-  unsigned char *prop = NULL;
-  if (!GetEDIDProperty(output, &nitems, &prop))
-    return false;
-
-  bool found = ParseOutputOverscanFlag(prop, nitems, flag);
-  XFree(prop);
-  return found;
-}
-
-bool ParseOutputOverscanFlag(const unsigned char* prop,
-                             unsigned long nitems,
-                             bool *flag) {
-  // See http://en.wikipedia.org/wiki/Extended_display_identification_data
-  // for the extension format of EDID.  Also see EIA/CEA-861 spec for
-  // the format of the extensions and how video capability is encoded.
-  //  - byte 0: tag.  should be 02h.
-  //  - byte 1: revision.  only cares revision 3 (03h).
-  //  - byte 4-: data block.
-  const unsigned int kExtensionBase = 128;
-  const unsigned int kExtensionSize = 128;
-  const unsigned int kNumExtensionsOffset = 126;
-  const unsigned int kDataBlockOffset = 4;
-  const unsigned char kCEAExtensionTag = '\x02';
-  const unsigned char kExpectedExtensionRevision = '\x03';
-  const unsigned char kExtendedTag = 7;
-  const unsigned char kExtendedVideoCapabilityTag = 0;
-  const unsigned int kPTOverscan = 4;
-  const unsigned int kITOverscan = 2;
-  const unsigned int kCEOverscan = 0;
-
-  if (nitems <= kNumExtensionsOffset)
-    return false;
-
-  unsigned char num_extensions = prop[kNumExtensionsOffset];
-
-  for (size_t i = 0; i < num_extensions; ++i) {
-    // Skip parsing the whole extension if size is not enough.
-    if (nitems < kExtensionBase + (i + 1) * kExtensionSize)
-      break;
-
-    const unsigned char* extension = prop + kExtensionBase + i * kExtensionSize;
-    unsigned char tag = extension[0];
-    unsigned char revision = extension[1];
-    if (tag != kCEAExtensionTag || revision != kExpectedExtensionRevision)
-      continue;
-
-    unsigned char timing_descriptors_start =
-        std::min(extension[2], static_cast<unsigned char>(kExtensionSize));
-    const unsigned char* data_block = extension + kDataBlockOffset;
-    while (data_block < extension + timing_descriptors_start) {
-      // A data block is encoded as:
-      // - byte 1 high 3 bits: tag. '07' for extended tags.
-      // - byte 1 remaining bits: the length of data block.
-      // - byte 2: the extended tag.  '0' for video capability.
-      // - byte 3: the capability.
-      unsigned char tag = data_block[0] >> 5;
-      unsigned char payload_length = data_block[0] & 0x1f;
-      if (static_cast<unsigned long>(data_block + payload_length - prop) >
-          nitems)
-        break;
-
-      if (tag != kExtendedTag || payload_length < 2) {
-        data_block += payload_length + 1;
-        continue;
-      }
-
-      unsigned char extended_tag_code = data_block[1];
-      if (extended_tag_code != kExtendedVideoCapabilityTag) {
-        data_block += payload_length + 1;
-        continue;
-      }
-
-      // The difference between preferred, IT, and CE video formats
-      // doesn't matter. Sets |flag| to true if any of these flags are true.
-      if ((data_block[2] & (1 << kPTOverscan)) ||
-          (data_block[2] & (1 << kITOverscan)) ||
-          (data_block[2] & (1 << kCEOverscan))) {
-        *flag = true;
-      } else {
-        *flag = false;
-      }
-      return true;
-    }
-  }
-
-  return false;
-}
-
-bool IsInternalOutputName(const std::string& name) {
-  return name.find(kInternal_LVDS) == 0 || name.find(kInternal_eDP) == 0 ||
-      name.find(kInternal_DSI) == 0;
-}
-
-const XRRModeInfo* FindXRRModeInfo(const XRRScreenResources* screen_resources,
-                                   XID current_mode) {
-  for (int m = 0; m < screen_resources->nmode; m++) {
-    XRRModeInfo *mode = &screen_resources->modes[m];
-    if (mode->id == current_mode)
-      return mode;
-  }
-  return NULL;
-}
-
-namespace test {
-
-XRRModeInfo CreateModeInfo(int id,
-                           int width,
-                           int height,
-                           bool interlaced,
-                           float refresh_rate) {
-  XRRModeInfo mode_info = {0};
-  mode_info.id = id;
-  mode_info.width = width;
-  mode_info.height = height;
-  if (interlaced)
-    mode_info.modeFlags = RR_Interlace;
-  if (refresh_rate != 0.0f) {
-    mode_info.hTotal = 1;
-    mode_info.vTotal = 1;
-    mode_info.dotClock = refresh_rate;
-  }
-  return mode_info;
-}
-
-}  // namespace test
-
-}  // namespace chromeos
+}  // namespace base