Unfork VectorPlatformCanvas.

Unfork VectorPlatformCanvas by making NativeMetafile know how to create an appropriate VectorPlatformDevice. This will also be useful when we have multiple NativeMetafile implemenations (each requiring a different VectorPlatformDevices).

BUG=NONE
TEST=NONE

Review URL: http://codereview.chromium.org/6665046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@78662 0039d316-1c4b-4281-b951-d872f2087c98

chrome/renderer/print_web_view_helper_linux.cc

@@ -219,17 +219,14 @@ void PrintWebViewHelper::PrintPage(const ViewMsg_PrintPage_Params& params,
           margin_left_in_points,
       content_height_in_points + margin_top_in_points +
           margin_bottom_in_points);
+  gfx::Point content_origin(margin_left_in_points, margin_top_in_points);
 
-  cairo_t* cairo_context =
-      metafile->StartPage(page_size,
-                          margin_top_in_points,
-                          margin_left_in_points);
-  if (!cairo_context)
+  skia::PlatformDevice* device = metafile->StartPageForVectorCanvas(
+      page_size, content_origin, 1.0f);
+  if (!device)
     return;
 
-  canvas->reset(new skia::VectorCanvas(cairo_context,
-                                       canvas_size.width(),
-                                       canvas_size.height()));
+  canvas->reset(new skia::VectorCanvas(device));
   frame->printPage(params.page_number, canvas->get());
 
   // TODO(myhuang): We should handle transformation for paper margins.

chrome/renderer/print_web_view_helper_win.cc

@@ -194,8 +194,7 @@ void PrintWebViewHelper::CreatePreviewDocument(
 void PrintWebViewHelper::RenderPage(
     const ViewMsg_Print_Params& params, float* scale_factor, int page_number,
     WebFrame* frame, scoped_ptr<printing::NativeMetafile>* metafile) {
-  HDC hdc = (*metafile)->context();
-  DCHECK(hdc);
+  DCHECK(metafile->get()->context());
 
   double content_width_in_points;
   double content_height_in_points;
@@ -209,45 +208,12 @@ void PrintWebViewHelper::RenderPage(
   int width = static_cast<int>(content_width_in_points * params.max_shrink);
   int height = static_cast<int>(content_height_in_points * params.max_shrink);
 
-  bool result = (*metafile)->StartPage();
-  DCHECK(result);
-
-#if 0
-  // TODO(maruel): This code is kept for testing until the 100% GDI drawing
-  // code is stable. maruels use this code's output as a reference when the
-  // GDI drawing code fails.
-
-  // Mix of Skia and GDI based.
-  skia::PlatformCanvas canvas(width, height, true);
-  canvas.drawARGB(255, 255, 255, 255, SkXfermode::kSrc_Mode);
-  float webkit_scale_factor = frame->printPage(page_number, &canvas);
-  if (*scale_factor <= 0 || webkit_scale_factor <= 0) {
-    NOTREACHED() << "Printing page " << page_number << " failed.";
-  } else {
-    // Update the dpi adjustment with the "page |scale_factor|" calculated in
-    // webkit.
-    *scale_factor /= webkit_scale_factor;
-  }
-
-  // Create a BMP v4 header that we can serialize.
-  BITMAPV4HEADER bitmap_header;
-  gfx::CreateBitmapV4Header(width, height, &bitmap_header);
-  const SkBitmap& src_bmp = canvas.getDevice()->accessBitmap(true);
-  SkAutoLockPixels src_lock(src_bmp);
-  int retval = StretchDIBits(hdc,
-                             0,
-                             0,
-                             width, height,
-                             0, 0,
-                             width, height,
-                             src_bmp.getPixels(),
-                             reinterpret_cast<BITMAPINFO*>(&bitmap_header),
-                             DIB_RGB_COLORS,
-                             SRCCOPY);
-  DCHECK(retval != GDI_ERROR);
-#else
-  // 100% GDI based.
-  skia::VectorCanvas canvas(hdc, width, height);
+  gfx::Size page_size(width, height);
+  gfx::Point content_origin;
+  skia::PlatformDevice* device = (*metafile)->StartPageForVectorCanvas(
+      page_size, content_origin, 1.0f);
+  DCHECK(device);
+  skia::VectorCanvas canvas(device);
   float webkit_scale_factor = frame->printPage(page_number, &canvas);
   if (*scale_factor <= 0 || webkit_scale_factor <= 0) {
     NOTREACHED() << "Printing page " << page_number << " failed.";
@@ -256,13 +222,12 @@ void PrintWebViewHelper::RenderPage(
     // webkit.
     *scale_factor /= webkit_scale_factor;
   }
-#endif
 
-  result = (*metafile)->FinishPage();
+  bool result = (*metafile)->FinishPage();
   DCHECK(result);
 
   skia::VectorPlatformDevice* platform_device =
-      static_cast<skia::VectorPlatformDevice*>(canvas.getDevice());
+      static_cast<skia::VectorPlatformDevice*>(device);
   if (platform_device->alpha_blend_used() && !params.supports_alpha_blend) {
     // Close the device context to retrieve the compiled metafile.
     if (!(*metafile)->Close())

printing/emf_win.cc

@@ -9,6 +9,7 @@
 #include "base/metrics/histogram.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
+#include "skia/ext/vector_platform_device_win.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/codec/jpeg_codec.h"
 #include "ui/gfx/codec/png_codec.h"
@@ -410,6 +411,18 @@ bool Emf::Record::SafePlayback(const XFORM* base_matrix) const {
   return res;
 }
 
+skia::PlatformDevice* Emf::StartPageForVectorCanvas(
+    const gfx::Size& page_size, const gfx::Point& /*content_origin*/,
+    const float& scale_factor) {
+  DCHECK_EQ(1.0f, scale_factor);  // We don't support scaling here.
+  if (!StartPage())
+    return NULL;
+
+  return skia::VectorPlatformDeviceFactory::CreateDevice(page_size.width(),
+                                                         page_size.height(),
+                                                         true, hdc_);
+}
+
 bool Emf::StartPage() {
   DCHECK(hdc_);
   if (!hdc_)

printing/emf_win.h

@@ -15,6 +15,7 @@
 class FilePath;
 
 namespace gfx {
+class Point;
 class Rect;
 }
 
@@ -33,6 +34,9 @@ class Emf : public NativeMetafile {
   virtual bool Init() { return true; }
   virtual bool InitFromData(const void* src_buffer, uint32 src_buffer_size);
 
+  virtual skia::PlatformDevice* StartPageForVectorCanvas(
+      const gfx::Size& page_size, const gfx::Point& content_origin,
+      const float& scale_factor);
   virtual bool StartPage();
   virtual bool FinishPage();
   virtual bool Close();

printing/native_metafile.h

@@ -26,6 +26,10 @@ class Size;
 class Point;
 }
 
+namespace skia {
+class PlatformDevice;
+}
+
 #if defined(OS_CHROMEOS)
 namespace base {
 class  FileDescriptor;
@@ -50,6 +54,13 @@ class NativeMetafile {
   // Note: It should only be called from within the browser process.
   virtual bool InitFromData(const void* src_buffer, uint32 src_buffer_size) = 0;
 
+  // This method calls StartPage and then returns an appropriate
+  // VectorPlatformDevice implementation bound to the context created by
+  // StartPage or NULL on error.
+  virtual skia::PlatformDevice* StartPageForVectorCanvas(
+      const gfx::Size& page_size, const gfx::Point& content_origin,
+      const float& scale_factor) = 0;
+
 #if defined(OS_WIN)
   // Inserts a custom GDICOMMENT records indicating StartPage/EndPage calls
   // (since StartPage and EndPage do not work in a metafile DC). Only valid

printing/pdf_metafile_mac.cc

@@ -62,6 +62,13 @@ bool PdfMetafile::InitFromData(const void* src_buffer, uint32 src_buffer_size) {
   return true;
 }
 
+skia::PlatformDevice* PdfMetafile::StartPageForVectorCanvas(
+    const gfx::Size& page_size, const gfx::Point& content_origin,
+    const float& scale_factor) {
+  NOTIMPLEMENTED();
+  return NULL;
+}
+
 CGContextRef PdfMetafile::StartPage(const gfx::Size& page_size,
     const gfx::Point& content_origin, const float& scale_factor) {
   DCHECK(context_.get());

printing/pdf_metafile_mac.h

@@ -33,6 +33,10 @@ class PdfMetafile : public NativeMetafile {
   virtual bool Init();
   virtual bool InitFromData(const void* src_buffer, uint32 src_buffer_size);
 
+  // Not implemented on mac.
+  skia::PlatformDevice* StartPageForVectorCanvas(
+      const gfx::Size& page_size, const gfx::Point& content_origin,
+      const float& scale_factor);
   virtual CGContextRef StartPage(const gfx::Size& page_size,
                                  const gfx::Point& content_origin,
                                  const float& scale_factor);

printing/pdf_ps_metafile_cairo.cc

@@ -145,6 +145,19 @@ bool PdfPsMetafile::SetRawData(const void* src_buffer,
   return true;
 }
 
+skia::PlatformDevice* PdfPsMetafile::StartPageForVectorCanvas(
+    const gfx::Size& page_size, const gfx::Point& content_origin,
+    const float& scale_factor) {
+  DCHECK_EQ(1.0f, scale_factor);  // We don't yet support scale_factor.
+  if (!StartPage(page_size, content_origin.y(), content_origin.x()))
+    return NULL;
+
+  return skia::VectorPlatformDeviceFactory::CreateDevice(context_,
+                                                         page_size.width(),
+                                                         page_size.height(),
+                                                         true);
+}
+
 cairo_t* PdfPsMetafile::StartPage(const gfx::Size& page_size,
                                   double margin_top_in_points,
                                   double margin_left_in_points) {

printing/pdf_ps_metafile_cairo.h

@@ -25,6 +25,9 @@ class PdfPsMetafile : public NativeMetafile {
   virtual bool Init();
   virtual bool InitFromData(const void* src_buffer, uint32 src_buffer_size);
 
+  virtual skia::PlatformDevice* StartPageForVectorCanvas(
+      const gfx::Size& page_size, const gfx::Point& content_origin,
+      const float& scale_factor);
   virtual cairo_t* StartPage(const gfx::Size& page_size,
                              double margin_top_in_points,
                              double margin_left_in_points);

skia/ext/vector_canvas.cc

@@ -4,13 +4,13 @@
 
 #include "skia/ext/vector_canvas.h"
 
-namespace skia {
+#include "skia/ext/vector_platform_device.h"
 
-VectorCanvas::VectorCanvas()
-    : PlatformCanvas(SkNEW(VectorPlatformDeviceFactory)) {
-}
+namespace skia {
 
-VectorCanvas::VectorCanvas(SkDeviceFactory* factory) : PlatformCanvas(factory) {
+VectorCanvas::VectorCanvas(PlatformDevice* device)
+    : PlatformCanvas(device->getDeviceFactory()) {
+  setDevice(device)->unref(); // Created with refcount 1, and setDevice refs.
 }
 
 VectorCanvas::~VectorCanvas() {

skia/ext/vector_canvas.h

@@ -7,38 +7,21 @@
 #pragma once
 
 #include "skia/ext/platform_canvas.h"
-#include "skia/ext/vector_platform_device.h"
-
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
-typedef struct _cairo cairo_t;
-#endif
 
 namespace skia {
 
+class PlatformDevice;
+
 // This class is a specialization of the regular PlatformCanvas. It is designed
 // to work with a VectorDevice to manage platform-specific drawing. It allows
 // using both Skia operations and platform-specific operations. It *doesn't*
 // support reading back from the bitmap backstore since it is not used.
 class SK_API VectorCanvas : public PlatformCanvas {
  public:
-  VectorCanvas();
-  explicit VectorCanvas(SkDeviceFactory* factory);
-#if defined(WIN32)
-  VectorCanvas(HDC dc, int width, int height);
-#elif defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
-  // Caller owns |context|. Ownership is not transferred.
-  VectorCanvas(cairo_t* context, int width, int height);
-#endif
+  // Ownership of |device| is transfered to VectorCanvas.
+  explicit VectorCanvas(PlatformDevice* device);
   virtual ~VectorCanvas();
 
-  // For two-part init, call if you use the no-argument constructor above
-#if defined(WIN32)
-  bool initialize(HDC context, int width, int height);
-#elif defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
-  // Ownership of |context| is not transferred.
-  bool initialize(cairo_t* context, int width, int height);
-#endif
-
   virtual SkBounder* setBounder(SkBounder* bounder);
   virtual SkDrawFilter* setDrawFilter(SkDrawFilter* filter);
 

skia/ext/vector_canvas_unittest.cc

@@ -14,6 +14,7 @@
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "skia/ext/vector_canvas.h"
+#include "skia/ext/vector_platform_device.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/effects/SkDashPathEffect.h"
 #include "ui/gfx/codec/png_codec.h"
@@ -386,7 +387,8 @@ class VectorCanvasTest : public ImageTest {
     size_ = size;
     context_ = new Context();
     bitmap_ = new Bitmap(*context_, size_, size_);
-    vcanvas_ = new VectorCanvas(context_->context(), size_, size_);
+    vcanvas_ = new VectorCanvas(VectorPlatformDeviceFactory::CreateDevice(
+        size_, size_, true, context_->context()));
     pcanvas_ = new PlatformCanvas(size_, size_, false);
 
     // Clear white.
@@ -452,7 +454,8 @@ TEST_F(VectorCanvasTest, Uninitialized) {
 
   context_ = new Context();
   bitmap_ = new Bitmap(*context_, size_, size_);
-  vcanvas_ = new VectorCanvas(context_->context(), size_, size_);
+  vcanvas_ = new VectorCanvas(VectorPlatformDeviceFactory::CreateDevice(
+      size_, size_, true, context_->context()));
   pcanvas_ = new PlatformCanvas(size_, size_, false);
 
   // VectorCanvas default initialization is black.

skia/ext/vector_platform_device_linux.cc

@@ -78,9 +78,9 @@ SkDevice* VectorPlatformDeviceFactory::newDevice(SkCanvas* ignored,
 }
 
 // static
-SkDevice* VectorPlatformDeviceFactory::CreateDevice(cairo_t* context,
-                                                    int width, int height,
-                                                    bool isOpaque) {
+PlatformDevice* VectorPlatformDeviceFactory::CreateDevice(cairo_t* context,
+                                                          int width, int height,
+                                                          bool isOpaque) {
   // TODO(myhuang): Here we might also have similar issues as those on Windows
   // (vector_canvas_win.cc, http://crbug.com/18382 & http://crbug.com/18383).
   // Please note that is_opaque is true when we use this class for printing.

skia/ext/vector_platform_device_linux.h

@@ -15,8 +15,8 @@ namespace skia {
 
 class VectorPlatformDeviceFactory : public SkDeviceFactory {
  public:
-  static SkDevice* CreateDevice(cairo_t* context, int width, int height,
-                                bool isOpaque);
+  static PlatformDevice* CreateDevice(cairo_t* context, int width, int height,
+                                      bool isOpaque);
 
   // Overridden from SkDeviceFactory:
   virtual SkDevice* newDevice(SkCanvas* ignored, SkBitmap::Config config,