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// Copyright (c) 2012 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_PLATFORM_DEVICE_H_
#define SKIA_EXT_PLATFORM_DEVICE_H_
#include "build/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#include <vector>
#endif
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkDevice.h"
#include "third_party/skia/include/core/SkPreConfig.h"
class SkMatrix;
class SkMetaData;
class SkPath;
class SkRegion;
#if defined(OS_LINUX) || defined(OS_OPENBSD) || defined(OS_FREEBSD) \
|| defined(OS_SUN)
typedef struct _cairo cairo_t;
typedef struct _cairo_rectangle cairo_rectangle_t;
#elif defined(OS_MACOSX)
typedef struct CGContext* CGContextRef;
typedef struct CGRect CGRect;
#endif
namespace skia {
class PlatformDevice;
#if defined(OS_WIN)
typedef HDC PlatformSurface;
typedef RECT PlatformRect;
#elif defined(ANDROID)
typedef void* PlatformSurface;
typedef SkIRect* PlatformRect;
#elif defined(OS_LINUX) || defined(OS_OPENBSD) || defined(OS_FREEBSD) \
|| defined(OS_SUN)
typedef cairo_t* PlatformSurface;
typedef cairo_rectangle_t PlatformRect;
#elif defined(OS_MACOSX)
typedef CGContextRef PlatformSurface;
typedef CGRect PlatformRect;
#endif
// The following routines provide accessor points for the functionality
// exported by the various PlatformDevice ports. The PlatformDevice, and
// BitmapPlatformDevice classes inherit directly from SkDevice, which is no
// longer a supported usage-pattern for skia. In preparation of the removal of
// these classes, all calls to PlatformDevice::* should be routed through these
// helper functions.
// Bind a PlatformDevice instance, |platform_device| to |device|. Subsequent
// calls to the functions exported below will forward the request to the
// corresponding method on the bound PlatformDevice instance. If no
// PlatformDevice has been bound to the SkDevice passed, then the routines are
// NOPS.
SK_API void SetPlatformDevice(SkDevice* device,
PlatformDevice* platform_device);
SK_API PlatformDevice* GetPlatformDevice(SkDevice* device);
#if defined(OS_WIN)
// Initializes the default settings and colors in a device context.
SK_API void InitializeDC(HDC context);
#elif defined(OS_MACOSX)
// Returns the CGContext that backing the SkDevice. Forwards to the bound
// PlatformDevice. Returns NULL if no PlatformDevice is bound.
SK_API CGContextRef GetBitmapContext(SkDevice* device);
#endif
// Following routines are used in print preview workflow to mark the draft mode
// metafile and preview metafile.
SK_API SkMetaData& getMetaData(const SkCanvas& canvas);
SK_API void SetIsDraftMode(const SkCanvas& canvas, bool draft_mode);
SK_API bool IsDraftMode(const SkCanvas& canvas);
#if defined(OS_MACOSX) || defined(OS_WIN)
SK_API void SetIsPreviewMetafile(const SkCanvas& canvas, bool is_preview);
SK_API bool IsPreviewMetafile(const SkCanvas& canvas);
#endif
// A SkDevice is basically a wrapper around SkBitmap that provides a surface for
// SkCanvas to draw into. PlatformDevice provides a surface Windows can also
// write to. It also provides functionality to play well with GDI drawing
// functions. This class is abstract and must be subclassed. It provides the
// basic interface to implement it either with or without a bitmap backend.
//
// PlatformDevice provides an interface which sub-classes of SkDevice can also
// provide to allow for drawing by the native platform into the device.
class SK_API PlatformDevice {
public:
virtual ~PlatformDevice() {}
#if defined(OS_MACOSX)
// The CGContext that corresponds to the bitmap, used for CoreGraphics
// operations drawing into the bitmap. This is possibly heavyweight, so it
// should exist only during one pass of rendering.
virtual CGContextRef GetBitmapContext() = 0;
#endif
// The DC that corresponds to the bitmap, used for GDI operations drawing
// into the bitmap. This is possibly heavyweight, so it should be existant
// only during one pass of rendering.
virtual PlatformSurface BeginPlatformPaint();
// Finish a previous call to beginPlatformPaint.
virtual void EndPlatformPaint();
// Draws to the given screen DC, if the bitmap DC doesn't exist, this will
// temporarily create it. However, if you have created the bitmap DC, it will
// be more efficient if you don't free it until after this call so it doesn't
// have to be created twice. If src_rect is null, then the entirety of the
// source device will be copied.
virtual void DrawToNativeContext(PlatformSurface surface, int x, int y,
const PlatformRect* src_rect) = 0;
// Returns if GDI is allowed to render text to this device.
virtual bool IsNativeFontRenderingAllowed();
// True if AlphaBlend() was called during a
// BeginPlatformPaint()/EndPlatformPaint() pair.
// Used by the printing subclasses. See |VectorPlatformDeviceEmf|.
virtual bool AlphaBlendUsed() const;
#if defined(OS_WIN)
// Loads a SkPath into the GDI context. The path can there after be used for
// clipping or as a stroke. Returns false if the path failed to be loaded.
static bool LoadPathToDC(HDC context, const SkPath& path);
// Loads a SkRegion into the GDI context.
static void LoadClippingRegionToDC(HDC context, const SkRegion& region,
const SkMatrix& transformation);
#elif defined(OS_MACOSX)
// Loads a SkPath into the CG context. The path can there after be used for
// clipping or as a stroke.
static void LoadPathToCGContext(CGContextRef context, const SkPath& path);
// Initializes the default settings and colors in a device context.
static void InitializeCGContext(CGContextRef context);
// Loads a SkRegion into the CG context.
static void LoadClippingRegionToCGContext(CGContextRef context,
const SkRegion& region,
const SkMatrix& transformation);
#endif
protected:
#if defined(OS_WIN)
// Arrays must be inside structures.
struct CubicPoints {
SkPoint p[4];
};
typedef std::vector<CubicPoints> CubicPath;
typedef std::vector<CubicPath> CubicPaths;
// Loads the specified Skia transform into the device context, excluding
// perspective (which GDI doesn't support).
static void LoadTransformToDC(HDC dc, const SkMatrix& matrix);
// Transforms SkPath's paths into a series of cubic path.
static bool SkPathToCubicPaths(CubicPaths* paths, const SkPath& skpath);
#elif defined(OS_MACOSX)
// Loads the specified Skia transform into the device context
static void LoadTransformToCGContext(CGContextRef context,
const SkMatrix& matrix);
#endif
};
} // namespace skia
#endif // SKIA_EXT_PLATFORM_DEVICE_H_
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