Add a font API to Pepper and implement on Linux based on agl's code from http://codereview.chromium.org/2673003.

Review URL: http://codereview.chromium.org/2794004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@49599 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 178 insertions, 1 deletions

diff --git a/chrome/renderer/renderer_sandbox_support_linux.cc b/chrome/renderer/renderer_sandbox_support_linux.cc
index f1d03e3..4b02bbce 100644
--- a/chrome/renderer/renderer_sandbox_support_linux.cc
+++ b/chrome/renderer/renderer_sandbox_support_linux.cc
@@ -4,8 +4,12 @@
 
 #include "chrome/renderer/renderer_sandbox_support_linux.h"
 
+#include <sys/stat.h>
+
+#include "base/eintr_wrapper.h"
 #include "base/global_descriptors_posix.h"
 #include "base/pickle.h"
+#include "base/scoped_ptr.h"
 #include "base/unix_domain_socket_posix.h"
 #include "chrome/common/chrome_descriptors.h"
 #include "chrome/common/sandbox_methods_linux.h"
@@ -18,7 +22,8 @@ static int GetSandboxFD() {
 
 namespace renderer_sandbox_support {
 
-std::string getFontFamilyForCharacters(const uint16_t* utf16, size_t num_utf16) {
+std::string getFontFamilyForCharacters(const uint16_t* utf16,
+                                       size_t num_utf16) {
   Pickle request;
   request.WriteInt(LinuxSandbox::METHOD_GET_FONT_FAMILY_FOR_CHARS);
   request.WriteInt(num_utf16);
@@ -87,4 +92,96 @@ int MakeSharedMemorySegmentViaIPC(size_t length) {
   return result_fd;
 }
 
+int MatchFontWithFallback(const std::string& face, bool bold,
+                          bool italic, NPCharset charset) {
+  Pickle request;
+  request.WriteInt(LinuxSandbox::METHOD_MATCH_WITH_FALLBACK);
+  request.WriteString(face);
+  request.WriteBool(bold);
+  request.WriteBool(italic);
+  request.WriteUInt32(charset);
+  uint8_t reply_buf[64];
+  int fd = -1;
+  base::SendRecvMsg(GetSandboxFD(), reply_buf, sizeof(reply_buf),
+                    &fd, request);
+  return fd;
+}
+
+bool GetFontTable(int fd, uint32_t table, uint8_t* output,
+                  size_t* output_length) {
+  if (table == 0) {
+    struct stat st;
+    if (fstat(fd, &st) < 0)
+      return false;
+    size_t length = st.st_size;
+    if (!output) {
+      *output_length = length;
+      return true;
+    }
+    if (*output_length < length)
+      return false;
+    *output_length = length;
+    ssize_t n = HANDLE_EINTR(pread(fd, output, length, 0));
+    if (n != static_cast<ssize_t>(length))
+      return false;
+    return true;
+  }
+
+  unsigned num_tables;
+  uint8_t num_tables_buf[2];
+
+  ssize_t n = HANDLE_EINTR(pread(fd, &num_tables_buf, sizeof(num_tables_buf),
+                           4 /* skip the font type */));
+  if (n != sizeof(num_tables_buf))
+    return false;
+
+  num_tables = static_cast<unsigned>(num_tables_buf[0]) << 8 |
+               num_tables_buf[1];
+
+  // The size in bytes of an entry in the table directory.
+  static const unsigned kTableEntrySize = 16;
+  scoped_array<uint8_t> table_entries(
+      new uint8_t[num_tables * kTableEntrySize]);
+  n = HANDLE_EINTR(pread(fd, table_entries.get(), num_tables * kTableEntrySize,
+                         12 /* skip the SFNT header */));
+  if (n != static_cast<ssize_t>(num_tables * kTableEntrySize))
+    return false;
+
+  size_t offset;
+  size_t length = 0;
+  for (unsigned i = 0; i < num_tables; i++) {
+    const uint8_t* entry = table_entries.get() + i * kTableEntrySize;
+    if (memcmp(entry, &table, sizeof(table)) == 0) {
+      offset = static_cast<size_t>(entry[8]) << 24 |
+               static_cast<size_t>(entry[9]) << 16 |
+               static_cast<size_t>(entry[10]) << 8  |
+               static_cast<size_t>(entry[11]);
+      length = static_cast<size_t>(entry[12]) << 24 |
+               static_cast<size_t>(entry[13]) << 16 |
+               static_cast<size_t>(entry[14]) << 8  |
+               static_cast<size_t>(entry[15]);
+
+      break;
+    }
+  }
+
+  if (!length)
+    return false;
+
+  if (!output) {
+    *output_length = length;
+    return true;
+  }
+
+  if (*output_length < length)
+    return false;
+
+  *output_length = length;
+  n = HANDLE_EINTR(pread(fd, output, length, offset));
+  if (n != static_cast<ssize_t>(length))
+    return false;
+
+  return true;
+}
+
 }  // namespace render_sandbox_support
diff --git a/chrome/renderer/renderer_sandbox_support_linux.h b/chrome/renderer/renderer_sandbox_support_linux.h
index 3fa318b..098c46e 100644
--- a/chrome/renderer/renderer_sandbox_support_linux.h
+++ b/chrome/renderer/renderer_sandbox_support_linux.h
@@ -9,6 +9,8 @@
 
 #include <string>
 
+#include "third_party/npapi/bindings/npapi_extensions.h"
+
 namespace WebKit {
 struct WebFontRenderStyle;
 }
@@ -30,6 +32,24 @@ void getRenderStyleForStrike(const char* family, int sizeAndStyle,
 // Returns a file descriptor for a shared memory segment.
 int MakeSharedMemorySegmentViaIPC(size_t length);
 
+// Return a read-only file descriptor to the font which best matches the given
+// properties or -1 on failure.
+//   charset: specifies the language(s) that the font must cover. See
+// render_sandbox_host_linux.cc for more information.
+int MatchFontWithFallback(const std::string& face, bool bold,
+                          bool italic, NPCharset charset);
+
+// GetFontTable loads a specified font table from an open SFNT file.
+//   fd: a file descriptor to the SFNT file. The position doesn't matter.
+//   table: the table in *big-endian* format, or 0 for the whole font file.
+//   output: a buffer of size output_length that gets the data.  can be 0, in
+//     which case output_length will be set to the required size in bytes.
+//   output_length: size of output, if it's not 0.
+//
+//   returns: true on success.
+bool GetFontTable(int fd, uint32_t table, uint8_t* output,
+                  size_t* output_length);
+
 };  // namespace render_sandbox_support
 
 #endif  // CHROME_RENDERER_RENDERER_SANDBOX_SUPPORT_LINUX_H_
diff --git a/chrome/renderer/webplugin_delegate_pepper.cc b/chrome/renderer/webplugin_delegate_pepper.cc
index 1fd996e..69b1b0e 100644
--- a/chrome/renderer/webplugin_delegate_pepper.cc
+++ b/chrome/renderer/webplugin_delegate_pepper.cc
@@ -9,6 +9,10 @@
 #include <string>
 #include <vector>
 
+#if defined(OS_LINUX)
+#include <unistd.h>
+#endif
+
 #include "base/file_util.h"
 #include "base/keyboard_codes.h"
 #if defined(OS_MACOSX)
@@ -27,6 +31,9 @@
 #include "chrome/common/render_messages.h"
 #include "chrome/renderer/pepper_widget.h"
 #include "chrome/renderer/render_thread.h"
+#if defined(OS_LINUX)
+#include "chrome/renderer/renderer_sandbox_support_linux.h"
+#endif
 #include "chrome/renderer/webplugin_delegate_proxy.h"
 #include "gfx/blit.h"
 #if defined(OS_WIN)
@@ -426,6 +433,58 @@ bool WebPluginDelegatePepper::SetCursor(NPCursorType type) {
   return true;
 }
 
+NPError NPMatchFontWithFallback(NPP instance,
+                                const NPFontDescription* description,
+                                NPFontID* id) {
+#if defined(OS_LINUX)
+  int fd = renderer_sandbox_support::MatchFontWithFallback(
+      description->face, description->weight >= 700, description->italic,
+      description->charset);
+  if (fd == -1)
+    return NPERR_GENERIC_ERROR;
+  *id = fd;
+  return NPERR_NO_ERROR;
+#else
+  NOTIMPLEMENTED();
+  return NPERR_GENERIC_ERROR;
+#endif
+}
+
+NPError GetFontTable(NPP instance,
+                     NPFontID id,
+                     uint32_t table,
+                     void* output,
+                     size_t* output_length) {
+#if defined(OS_LINUX)
+  bool rv = renderer_sandbox_support::GetFontTable(
+      id, table, static_cast<uint8_t*>(output), output_length);
+  return rv ? NPERR_NO_ERROR : NPERR_GENERIC_ERROR;
+#else
+  NOTIMPLEMENTED();
+  return NPERR_GENERIC_ERROR;
+#endif
+}
+
+NPError NPDestroyFont(NPP instance, NPFontID id) {
+#if defined(OS_LINUX)
+  close(id);
+  return NPERR_NO_ERROR;
+#else
+  NOTIMPLEMENTED();
+  return NPERR_GENERIC_ERROR;
+#endif
+}
+
+NPFontExtensions g_font_extensions = {
+  NPMatchFontWithFallback,
+  GetFontTable,
+  NPDestroyFont
+};
+
+NPFontExtensions* WebPluginDelegatePepper::GetFontExtensions() {
+  return &g_font_extensions;
+}
+
 void WebPluginDelegatePepper::Zoom(int factor) {
   NPPExtensions* extensions = NULL;
   instance()->NPP_GetValue(NPPVPepperExtensions, &extensions);
diff --git a/chrome/renderer/webplugin_delegate_pepper.h b/chrome/renderer/webplugin_delegate_pepper.h
index 245a174..1d7ca2a 100644
--- a/chrome/renderer/webplugin_delegate_pepper.h
+++ b/chrome/renderer/webplugin_delegate_pepper.h
@@ -94,6 +94,7 @@ class WebPluginDelegatePepper : public webkit_glue::WebPluginDelegate,
                           void* user_data);
   virtual NPWidgetExtensions* GetWidgetExtensions();
   virtual bool SetCursor(NPCursorType type);
+  virtual NPFontExtensions* GetFontExtensions();
   virtual void Zoom(int factor);
   virtual void Copy();