Move BitmapPlatformDeviceData into its own header file.

skia/ext/bitmap_platform_device_data.h

+// Copyright (c) 2010 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.
+
+#ifndef SKIA_EXT_BITMAP_PLATFORM_DEVICE_DATA_H_
+#define SKIA_EXT_BITMAP_PLATFORM_DEVICE_DATA_H_
+
+#include "skia/ext/bitmap_platform_device.h"
+
+namespace skia {
+
+class BitmapPlatformDevice::BitmapPlatformDeviceData :
+#if defined(WIN32) || defined(__APPLE__)
+    public SkRefCnt {
+#elif defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+    // These objects are reference counted and own a Cairo surface. The surface
+    // is the backing store for a Skia bitmap and we reference count it so that
+    // we can copy BitmapPlatformDevice objects without having to copy all the
+    // image data.
+    public base::RefCounted<BitmapPlatformDeviceData> {
+#endif
+
+ public:
+#if defined(WIN32)
+  typedef HBITMAP PlatformContext;
+#elif defined(__APPLE__)
+  typedef CGContextRef PlatformContext;
+#elif defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+  typedef cairo_t* PlatformContext;
+#endif
+
+#if defined(WIN32) || defined(__APPLE__)
+  explicit BitmapPlatformDeviceData(PlatformContext bitmap);
+#elif defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+  explicit BitmapPlatformDeviceData(cairo_surface_t* surface);
+#endif
+
+#if defined(WIN32)
+  // Create/destroy hdc_, which is the memory DC for our bitmap data.
+  HDC GetBitmapDC();
+  void ReleaseBitmapDC();
+  bool IsBitmapDCCreated() const;
+#endif
+
+#if defined(__APPLE__)
+  void ReleaseBitmapContext() {
+    SkASSERT(bitmap_context_);
+    CGContextRelease(bitmap_context_);
+    bitmap_context_ = NULL;
+  }
+#endif  // defined(__APPLE__)
+
+  // Sets the transform and clip operations. This will not update the CGContext,
+  // but will mark the config as dirty. The next call of LoadConfig will
+  // pick up these changes.
+  void SetMatrixClip(const SkMatrix& transform, const SkRegion& region);
+
+  // Loads the current transform and clip into the context. Can be called even
+  // when |bitmap_context_| is NULL (will be a NOP).
+  void LoadConfig();
+
+  const SkMatrix& transform() const {
+    return transform_;
+  }
+
+  PlatformContext bitmap_context() {
+    return bitmap_context_;
+  }
+
+ private:
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+  friend class base::RefCounted<BitmapPlatformDeviceData>;
+#endif
+  virtual ~BitmapPlatformDeviceData();
+
+  // Lazily-created graphics context used to draw into the bitmap.
+  PlatformContext bitmap_context_;
+
+#if defined(WIN32)
+  // Lazily-created DC used to draw into the bitmap, see GetBitmapDC().
+  HDC hdc_;
+#elif defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+  cairo_surface_t *const surface_;
+#endif
+
+  // True when there is a transform or clip that has not been set to the
+  // context.  The context is retrieved for every text operation, and the
+  // transform and clip do not change as much. We can save time by not loading
+  // the clip and transform for every one.
+  bool config_dirty_;
+
+  // Translation assigned to the context: we need to keep track of this
+  // separately so it can be updated even if the context isn't created yet.
+  SkMatrix transform_;
+
+  // The current clipping
+  SkRegion clip_region_;
+
+  // Disallow copy & assign.
+  BitmapPlatformDeviceData(const BitmapPlatformDeviceData&);
+  BitmapPlatformDeviceData& operator=(const BitmapPlatformDeviceData&);
+};
+
+}  // namespace skia
+
+#endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_DATA_H_