Move Emf class to the printing library. Also creates a platform agnostic Nat...

chrome/common/gfx/emf.cc

Index: chrome/common/gfx/emf.cc
===================================================================
--- chrome/common/gfx/emf.cc	(revision 19913)
+++ chrome/common/gfx/emf.cc	(working copy)
@@ -1,317 +0,0 @@
-// Copyright (c) 2006-2008 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 "chrome/common/gfx/emf.h"
-
-#include "base/gfx/rect.h"
-#include "base/logging.h"
-
-namespace gfx {
-
-Emf::Emf() : emf_(NULL), hdc_(NULL) {
-}
-
-Emf::~Emf() {
-  CloseEmf();
-  DCHECK(!emf_ && !hdc_);
-}
-
-bool Emf::CreateDc(HDC sibling, const RECT* rect) {
-  DCHECK(!emf_ && !hdc_);
-  hdc_ = CreateEnhMetaFile(sibling, NULL, rect, NULL);
-  DCHECK(hdc_);
-  return hdc_ != NULL;
-}
-
-bool Emf::CreateFromData(const void* buffer, size_t size) {
-  DCHECK(!emf_ && !hdc_);
-  emf_ = SetEnhMetaFileBits(static_cast<unsigned>(size),
-                            reinterpret_cast<const BYTE*>(buffer));
-  DCHECK(emf_);
-  return emf_ != NULL;
-}
-
-bool Emf::CloseDc() {
-  DCHECK(!emf_ && hdc_);
-  emf_ = CloseEnhMetaFile(hdc_);
-  DCHECK(emf_);
-  hdc_ = NULL;
-  return emf_ != NULL;
-}
-
-void Emf::CloseEmf() {
-  DCHECK(!hdc_);
-  if (emf_) {
-    DeleteEnhMetaFile(emf_);
-    emf_ = NULL;
-  }
-}
-
-bool Emf::Playback(HDC hdc, const RECT* rect) const {
-  DCHECK(emf_ && !hdc_);
-  RECT bounds;
-  if (!rect) {
-    // Get the natural bounds of the EMF buffer.
-    bounds = GetBounds().ToRECT();
-    rect = &bounds;
-  }
-  return PlayEnhMetaFile(hdc, emf_, rect) != 0;
-}
-
-bool Emf::SafePlayback(HDC context) const {
-  DCHECK(emf_ && !hdc_);
-  XFORM base_matrix;
-  if (!GetWorldTransform(context, &base_matrix)) {
-    NOTREACHED();
-    return false;
-  }
-
-  return EnumEnhMetaFile(context,
-                         emf_,
-                         &Emf::SafePlaybackProc,
-                         reinterpret_cast<void*>(&base_matrix),
-                         &GetBounds().ToRECT()) != 0;
-}
-
-gfx::Rect Emf::GetBounds() const {
-  DCHECK(emf_ && !hdc_);
-  ENHMETAHEADER header;
-  if (GetEnhMetaFileHeader(emf_, sizeof(header), &header) != sizeof(header)) {
-    NOTREACHED();
-    return gfx::Rect();
-  }
-  if (header.rclBounds.left == 0 &&
-      header.rclBounds.top == 0 &&
-      header.rclBounds.right == -1 &&
-      header.rclBounds.bottom == -1) {
-    // A freshly created EMF buffer that has no drawing operation has invalid
-    // bounds. Instead of having an (0,0) size, it has a (-1,-1) size. Detect
-    // this special case and returns an empty Rect instead of an invalid one.
-    return gfx::Rect();
-  }
-  return gfx::Rect(header.rclBounds.left,
-                   header.rclBounds.top,
-                   header.rclBounds.right - header.rclBounds.left,
-                   header.rclBounds.bottom - header.rclBounds.top);
-}
-
-unsigned Emf::GetDataSize() const {
-  DCHECK(emf_ && !hdc_);
-  return GetEnhMetaFileBits(emf_, 0, NULL);
-}
-
-bool Emf::GetData(void* buffer, size_t size) const {
-  DCHECK(emf_ && !hdc_);
-  DCHECK(buffer && size);
-  unsigned size2 = GetEnhMetaFileBits(emf_, static_cast<unsigned>(size),
-                                      reinterpret_cast<BYTE*>(buffer));
-  DCHECK(size2 == size);
-  return size2 == size && size2 != 0;
-}
-
-bool Emf::GetData(std::vector<uint8>* buffer) const {
-  unsigned size = GetDataSize();
-  if (!size)
-    return false;
-
-  buffer->resize(size);
-  if (!GetData(&buffer->front(), size))
-    return false;
-  return true;
-}
-
-bool Emf::SaveTo(const std::wstring& filename) const {
-  HANDLE file = CreateFile(filename.c_str(), GENERIC_WRITE,
-                           FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
-                           CREATE_ALWAYS, 0, NULL);
-  if (file == INVALID_HANDLE_VALUE)
-    return false;
-
-  bool success = false;
-  std::vector<uint8> buffer;
-  if (GetData(&buffer)) {
-    DWORD written = 0;
-    if (WriteFile(file, &*buffer.begin(), static_cast<DWORD>(buffer.size()),
-                  &written, NULL) &&
-        written == buffer.size()) {
-      success = true;
-    }
-  }
-  CloseHandle(file);
-  return success;
-}
-
-int CALLBACK Emf::SafePlaybackProc(HDC hdc,
-                                   HANDLETABLE* handle_table,
-                                   const ENHMETARECORD* record,
-                                   int objects_count,
-                                   LPARAM param) {
-  const XFORM* base_matrix = reinterpret_cast<const XFORM*>(param);
-  EnumerationContext context;
-  context.handle_table = handle_table;
-  context.objects_count = objects_count;
-  context.hdc = hdc;
-  Record record_instance(&context, record);
-  bool success = record_instance.SafePlayback(base_matrix);
-  DCHECK(success);
-  return 1;
-}
-
-Emf::Record::Record() {
-}
-
-Emf::Record::Record(const EnumerationContext* context,
-                    const ENHMETARECORD* record)
-    : record_(record),
-      context_(context) {
-  DCHECK(record_);
-}
-
-bool Emf::Record::Play() const {
-  return 0 != PlayEnhMetaFileRecord(context_->hdc,
-                                    context_->handle_table,
-                                    record_,
-                                    context_->objects_count);
-}
-
-bool Emf::Record::SafePlayback(const XFORM* base_matrix) const {
-  // For EMF field description, see [MS-EMF] Enhanced Metafile Format
-  // Specification.
-  //
-  // This is the second major EMF breakage I get; the first one being
-  // SetDCBrushColor/SetDCPenColor/DC_PEN/DC_BRUSH being silently ignored.
-  //
-  // This function is the guts of the fix for bug 1186598. Some printer drivers
-  // somehow choke on certain EMF records, but calling the corresponding
-  // function directly on the printer HDC is fine. Still, playing the EMF record
-  // fails. Go figure.
-  //
-  // The main issue is that SetLayout is totally unsupported on these printers
-  // (HP 4500/4700). I used to call SetLayout and I stopped. I found out this is
-  // not sufficient because GDI32!PlayEnhMetaFile internally calls SetLayout(!)
-  // Damn.
-  //
-  // So I resorted to manually parse the EMF records and play them one by one.
-  // The issue with this method compared to using PlayEnhMetaFile to play back
-  // an EMF buffer is that the later silently fixes the matrix to take in
-  // account the matrix currently loaded at the time of the call.
-  // The matrix magic is done transparently when using PlayEnhMetaFile but since
-  // I'm processing one field at a time, I need to do the fixup myself. Note
-  // that PlayEnhMetaFileRecord doesn't fix the matrix correctly even when
-  // called inside an EnumEnhMetaFile loop. Go figure (bis).
-  //
-  // So when I see a EMR_SETWORLDTRANSFORM and EMR_MODIFYWORLDTRANSFORM, I need
-  // to fix the matrix according to the matrix previously loaded before playing
-  // back the buffer. Otherwise, the previously loaded matrix would be ignored
-  // and the EMF buffer would always be played back at its native resolution.
-  // Duh.
-  //
-  // I also use this opportunity to skip over eventual EMR_SETLAYOUT record that
-  // could remain.
-  //
-  // Note: I should probably care about view ports and clipping, eventually.
-  bool res;
-  switch (record()->iType) {
-    case EMR_SETWORLDTRANSFORM: {
-      DCHECK_EQ(record()->nSize, sizeof(DWORD) * 2 + sizeof(XFORM));
-      const XFORM* xform = reinterpret_cast<const XFORM*>(record()->dParm);
-      HDC hdc = context_->hdc;
-      if (base_matrix) {
-        res = 0 != SetWorldTransform(hdc, base_matrix) &&
-                   ModifyWorldTransform(hdc, xform, MWT_LEFTMULTIPLY);
-      } else {
-        res = 0 != SetWorldTransform(hdc, xform);
-      }
-      break;
-    }
-    case EMR_MODIFYWORLDTRANSFORM: {
-      DCHECK_EQ(record()->nSize,
-                sizeof(DWORD) * 2 + sizeof(XFORM) + sizeof(DWORD));
-      const XFORM* xform = reinterpret_cast<const XFORM*>(record()->dParm);
-      const DWORD* option = reinterpret_cast<const DWORD*>(xform + 1);
-      HDC hdc = context_->hdc;
-      switch (*option) {
-        case MWT_IDENTITY:
-          if (base_matrix) {
-            res = 0 != SetWorldTransform(hdc, base_matrix);
-          } else {
-            res = 0 != ModifyWorldTransform(hdc, xform, MWT_IDENTITY);
-          }
-          break;
-        case MWT_LEFTMULTIPLY:
-        case MWT_RIGHTMULTIPLY:
-          res = 0 != ModifyWorldTransform(hdc, xform, *option);
-          break;
-        case 4:  // MWT_SET
-          if (base_matrix) {
-            res = 0 != SetWorldTransform(hdc, base_matrix) &&
-                       ModifyWorldTransform(hdc, xform, MWT_LEFTMULTIPLY);
-          } else {
-            res = 0 != SetWorldTransform(hdc, xform);
-          }
-          break;
-        default:
-          res = false;
-          break;
-      }
-      break;
-    }
-    case EMR_SETLAYOUT:
-      // Ignore it.
-      res = true;
-      break;
-    default: {
-      res = Play();
-      break;
-    }
-  }
-  return res;
-}
-
-Emf::Enumerator::Enumerator(const Emf& emf, HDC context, const RECT* rect) {
-  context_.handle_table = NULL;
-  context_.objects_count = 0;
-  context_.hdc = NULL;
-  items_.clear();
-  if (!EnumEnhMetaFile(context,
-                       emf.emf(),
-                       &Emf::Enumerator::EnhMetaFileProc,
-                       reinterpret_cast<void*>(this),
-                       rect)) {
-    NOTREACHED();
-    items_.clear();
-  }
-  DCHECK_EQ(context_.hdc, context);
-}
-
-Emf::Enumerator::const_iterator Emf::Enumerator::begin() const {
-  return items_.begin();
-}
-
-Emf::Enumerator::const_iterator Emf::Enumerator::end() const {
-  return items_.end();
-}
-
-int CALLBACK Emf::Enumerator::EnhMetaFileProc(HDC hdc,
-                                              HANDLETABLE* handle_table,
-                                              const ENHMETARECORD* record,
-                                              int objects_count,
-                                              LPARAM param) {
-  Enumerator& emf = *reinterpret_cast<Enumerator*>(param);
-  if (!emf.context_.handle_table) {
-    DCHECK(!emf.context_.handle_table);
-    DCHECK(!emf.context_.objects_count);
-    emf.context_.handle_table = handle_table;
-    emf.context_.objects_count = objects_count;
-    emf.context_.hdc = hdc;
-  } else {
-    DCHECK_EQ(emf.context_.handle_table, handle_table);
-    DCHECK_EQ(emf.context_.objects_count, objects_count);
-    DCHECK_EQ(emf.context_.hdc, hdc);
-  }
-  emf.items_.push_back(Record(&emf.context_, record));
-  return 1;
-}
-
-}  // namespace gfx