Change Clipboard::ReadImage to return a bitmap.

This allows the PNG compression to be offloaded to another thread as
appropriate.

BUG=75237
TEST=Local testing.

Review URL: http://codereview.chromium.org/6835036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@82142 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 41 insertions, 81 deletions

diff --git a/ui/base/clipboard/DEPS b/ui/base/clipboard/DEPS
deleted file mode 100644
index 03b9e67..0000000
--- a/ui/base/clipboard/DEPS
+++ /dev/null
@@ -1,4 +0,0 @@
-include_rules = [

-  "+third_party/zlib",

-]

-

diff --git a/ui/base/clipboard/clipboard.h b/ui/base/clipboard/clipboard.h
index bc8b950..744f7a6 100644
--- a/ui/base/clipboard/clipboard.h
+++ b/ui/base/clipboard/clipboard.h
@@ -20,6 +20,7 @@ class Size;
 }
 
 class FilePath;
+class SkBitmap;
 
 #if defined(TOOLKIT_USES_GTK)
 typedef struct _GtkClipboard GtkClipboard;
@@ -151,9 +152,8 @@ class Clipboard {
   // Reads HTML from the clipboard, if available.
   void ReadHTML(Buffer buffer, string16* markup, std::string* src_url) const;
 
-  // Reads an image from the clipboard, if available. The returned data will be
-  // encoded in PNG format.
-  void ReadImage(Buffer buffer, std::string* data) const;
+  // Reads an image from the clipboard, if available.
+  SkBitmap ReadImage(Buffer buffer) const;
 
   // Reads a bookmark from the clipboard, if available.
   void ReadBookmark(string16* title, std::string* url) const;
diff --git a/ui/base/clipboard/clipboard_linux.cc b/ui/base/clipboard/clipboard_linux.cc
index e688875..3cbe7d8 100644
--- a/ui/base/clipboard/clipboard_linux.cc
+++ b/ui/base/clipboard/clipboard_linux.cc
@@ -14,6 +14,7 @@
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/gtk_util.h"
 #include "ui/gfx/size.h"
 
@@ -375,13 +376,10 @@ void Clipboard::ReadHTML(Clipboard::Buffer buffer, string16* markup,
   gtk_selection_data_free(data);
 }
 
-void Clipboard::ReadImage(Buffer buffer, std::string* data) const {
+SkBitmap Clipboard::ReadImage(Buffer buffer) const {
   // TODO(dcheng): implement this.
   NOTIMPLEMENTED();
-  if (!data) {
-    NOTREACHED();
-    return;
-  }
+  return SkBitmap();
 }
 
 void Clipboard::ReadBookmark(string16* title, std::string* url) const {
diff --git a/ui/base/clipboard/clipboard_mac.mm b/ui/base/clipboard/clipboard_mac.mm
index 74b73f9..63d456b 100644
--- a/ui/base/clipboard/clipboard_mac.mm
+++ b/ui/base/clipboard/clipboard_mac.mm
@@ -14,6 +14,8 @@
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #import "third_party/mozilla/NSPasteboard+Utils.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/canvas_skia.h"
 #include "ui/gfx/size.h"
 
 namespace ui {
@@ -240,26 +242,30 @@ void Clipboard::ReadHTML(Clipboard::Buffer buffer, string16* markup,
     src_url->clear();
 }
 
-void Clipboard::ReadImage(Buffer buffer, std::string* data) const {
+SkBitmap Clipboard::ReadImage(Buffer buffer) const {
   DCHECK_EQ(buffer, BUFFER_STANDARD);
-  if (!data) {
-    NOTREACHED();
-    return;
-  }
 
   scoped_nsobject<NSImage> image(
       [[NSImage alloc] initWithPasteboard:GetPasteboard()]);
   if (image.get()) {
-    NSArray* reps = [image representations];
-    NSData* png_data = [NSBitmapImageRep
-        representationOfImageRepsInArray:reps
-                               usingType:NSPNGFileType
-                              properties:[NSDictionary dictionary]];
-    if (png_data) {
-      data->assign(static_cast<const char*>([png_data bytes]),
-                   [png_data length]);
-    }
+    [image setFlipped:YES];
+    int width = [image size].width;
+    int height = [image size].height;
+
+    gfx::CanvasSkia canvas(width, height, false);
+    CGContextRef gc = canvas.beginPlatformPaint();
+    NSGraphicsContext* cocoa_gc =
+        [NSGraphicsContext graphicsContextWithGraphicsPort:gc flipped:NO];
+    [NSGraphicsContext setCurrentContext:cocoa_gc];
+    [image drawInRect:NSMakeRect(0, 0, width, height)
+             fromRect:NSZeroRect
+            operation:NSCompositeCopy
+             fraction:1.0];
+    [NSGraphicsContext restoreGraphicsState];
+    canvas.endPlatformPaint();
+    return canvas.ExtractBitmap();
   }
+  return SkBitmap();
 }
 
 void Clipboard::ReadBookmark(string16* title, std::string* url) const {
diff --git a/ui/base/clipboard/clipboard_win.cc b/ui/base/clipboard/clipboard_win.cc
index bf7399b..013da58 100644
--- a/ui/base/clipboard/clipboard_win.cc
+++ b/ui/base/clipboard/clipboard_win.cc
@@ -21,9 +21,9 @@
 #include "base/win/scoped_gdi_object.h"
 #include "base/win/scoped_hdc.h"
 #include "base/win/wrapped_window_proc.h"
-#include "third_party/zlib/zlib.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/clipboard/clipboard_util_win.h"
-#include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/canvas_skia.h"
 #include "ui/gfx/size.h"
 
 namespace ui {
@@ -430,76 +430,36 @@ void Clipboard::ReadHTML(Clipboard::Buffer buffer, string16* markup,
     markup->assign(UTF8ToWide(markup_utf8));
 }
 
-void Clipboard::ReadImage(Buffer buffer, std::string* data) const {
+SkBitmap Clipboard::ReadImage(Buffer buffer) const {
   DCHECK_EQ(buffer, BUFFER_STANDARD);
-  if (!data) {
-    NOTREACHED();
-    return;
-  }
 
   // Acquire the clipboard.
   ScopedClipboard clipboard;
   if (!clipboard.Acquire(GetClipboardWindow()))
-    return;
+    return SkBitmap();
 
   HBITMAP source_bitmap = static_cast<HBITMAP>(::GetClipboardData(CF_BITMAP));
   if (!source_bitmap)
-    return;
+    return SkBitmap();
 
   base::win::ScopedHDC source_dc(::CreateCompatibleDC(NULL));
   if (!source_dc)
-    return;
+    return SkBitmap();
+  ::SelectObject(source_dc, source_bitmap);
 
   // Get the dimensions of the bitmap.
   BITMAPINFO bitmap_info = {};
   bitmap_info.bmiHeader.biSize = sizeof(bitmap_info.bmiHeader);
   ::GetDIBits(source_dc, source_bitmap, 0, 0, 0, &bitmap_info, DIB_RGB_COLORS);
-  gfx::Size size(bitmap_info.bmiHeader.biWidth,
-                 abs(bitmap_info.bmiHeader.biHeight));
-
-
-  BITMAPINFO destination_bitmap_info = {};
-  destination_bitmap_info.bmiHeader.biSize =
-      sizeof(destination_bitmap_info.bmiHeader);
-  destination_bitmap_info.bmiHeader.biWidth = size.width();
-  // Convert to a top-down DIB.
-  destination_bitmap_info.bmiHeader.biHeight = -size.height();
-  destination_bitmap_info.bmiHeader.biPlanes = 1;
-  destination_bitmap_info.bmiHeader.biBitCount = 32;
-  destination_bitmap_info.bmiHeader.biCompression = BI_RGB;
-
-  unsigned char* raw_data;
-  base::win::ScopedHDC destination_dc(::CreateCompatibleDC(source_dc));
-  if (!destination_dc)
-    return;
-  base::win::ScopedGDIObject<HBITMAP> destination_bitmap(::CreateDIBSection(
-      destination_dc,
-      &destination_bitmap_info,
-      DIB_RGB_COLORS,
-      reinterpret_cast<void**>(&raw_data),
-      NULL,
-      0));
-  if (!destination_bitmap)
-    return;
+  int width = bitmap_info.bmiHeader.biWidth;
+  int height = bitmap_info.bmiHeader.biHeight;
 
-  ::SelectObject(source_dc, source_bitmap);
-  ::SelectObject(destination_dc, destination_bitmap);
-  ::BitBlt(destination_dc, 0, 0, size.width(), size.height(), source_dc, 0, 0,
-           SRCCOPY);
-
-  std::vector<unsigned char> png_data;
-  gfx::PNGCodec::EncodeWithCompressionLevel(
-      raw_data,
-      gfx::PNGCodec::FORMAT_BGRA,
-      size,
-      size.width() * 4,
-      false,
-      std::vector<gfx::PNGCodec::Comment>(),
-      Z_BEST_SPEED,
-      &png_data);
-
-  data->assign(reinterpret_cast<char*>(vector_as_array(&png_data)),
-               png_data.size());
+  gfx::CanvasSkia canvas(width, height, false);
+
+  HDC destination_dc = canvas.beginPlatformPaint();
+  ::BitBlt(destination_dc, 0, 0, width, height, source_dc, 0, 0, SRCCOPY);
+  canvas.endPlatformPaint();
+  return canvas.ExtractBitmap();
 }
 
 void Clipboard::ReadBookmark(string16* title, std::string* url) const {