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+// Copyright (c) 2009 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_VECTOR_PLATFORM_DEVICE_WIN_H_
+#define SKIA_EXT_VECTOR_PLATFORM_DEVICE_WIN_H_
+
+#include "skia/ext/platform_device.h"
+#include "third_party/skia/include/core/SkMatrix.h"
+#include "third_party/skia/include/core/SkRegion.h"
+
+namespace skia {
+
+// A device is basically a wrapper around SkBitmap that provides a surface for
+// SkCanvas to draw into. This specific device is not not backed by a surface
+// and is thus unreadable. This is because the backend is completely vectorial.
+// This device is a simple wrapper over a Windows device context (HDC) handle.
+class VectorPlatformDevice : public PlatformDevice {
+ public:
+ // Factory function. The DC is kept as the output context.
+ static VectorPlatformDevice* create(HDC dc, int width, int height);
+
+ VectorPlatformDevice(HDC dc, const SkBitmap& bitmap);
+ virtual ~VectorPlatformDevice();
+
+ virtual HDC getBitmapDC() {
+ return hdc_;
+ }
+
+ virtual void drawPaint(const SkDraw& draw, const SkPaint& paint);
+ virtual void drawPoints(const SkDraw& draw, SkCanvas::PointMode mode,
+ size_t count, const SkPoint[], const SkPaint& paint);
+ virtual void drawRect(const SkDraw& draw, const SkRect& r,
+ const SkPaint& paint);
+ virtual void drawPath(const SkDraw& draw, const SkPath& path,
+ const SkPaint& paint);
+ virtual void drawBitmap(const SkDraw& draw, const SkBitmap& bitmap,
+ const SkMatrix& matrix, const SkPaint& paint);
+ virtual void drawSprite(const SkDraw& draw, const SkBitmap& bitmap,
+ int x, int y, const SkPaint& paint);
+ virtual void drawText(const SkDraw& draw, const void* text, size_t len,
+ SkScalar x, SkScalar y, const SkPaint& paint);
+ virtual void drawPosText(const SkDraw& draw, const void* text, size_t len,
+ const SkScalar pos[], SkScalar constY,
+ int scalarsPerPos, const SkPaint& paint);
+ virtual void drawTextOnPath(const SkDraw& draw, const void* text, size_t len,
+ const SkPath& path, const SkMatrix* matrix,
+ const SkPaint& paint);
+ virtual void drawVertices(const SkDraw& draw, SkCanvas::VertexMode,
+ int vertexCount,
+ const SkPoint verts[], const SkPoint texs[],
+ const SkColor colors[], SkXfermode* xmode,
+ const uint16_t indices[], int indexCount,
+ const SkPaint& paint);
+ virtual void drawDevice(const SkDraw& draw, SkDevice*, int x, int y,
+ const SkPaint&);
+
+
+ virtual void setMatrixClip(const SkMatrix& transform, const SkRegion& region);
+ virtual void drawToHDC(HDC dc, int x, int y, const RECT* src_rect);
+ virtual bool IsVectorial() { return true; }
+
+ void LoadClipRegion();
+
+ private:
+ // Applies the SkPaint's painting properties in the current GDI context, if
+ // possible. If GDI can't support all paint's properties, returns false. It
+ // doesn't execute the "commands" in SkPaint.
+ bool ApplyPaint(const SkPaint& paint);
+
+ // Selects a new object in the device context. It can be a pen, a brush, a
+ // clipping region, a bitmap or a font. Returns the old selected object.
+ HGDIOBJ SelectObject(HGDIOBJ object);
+
+ // Creates a brush according to SkPaint's properties.
+ bool CreateBrush(bool use_brush, const SkPaint& paint);
+
+ // Creates a pen according to SkPaint's properties.
+ bool CreatePen(bool use_pen, const SkPaint& paint);
+
+ // Restores back the previous objects (pen, brush, etc) after a paint command.
+ void Cleanup();
+
+ // Creates a brush according to SkPaint's properties.
+ bool CreateBrush(bool use_brush, COLORREF color);
+
+ // Creates a pen according to SkPaint's properties.
+ bool CreatePen(bool use_pen, COLORREF color, int stroke_width,
+ float stroke_miter, DWORD pen_style);
+
+ // Draws a bitmap in the the device, using the currently loaded matrix.
+ void InternalDrawBitmap(const SkBitmap& bitmap, int x, int y,
+ const SkPaint& paint);
+
+ // The Windows Device Context handle. It is the backend used with GDI drawing.
+ // This backend is write-only and vectorial.
+ HDC hdc_;
+
+ // Translation assigned to the DC: we need to keep track of this separately
+ // so it can be updated even if the DC isn't created yet.
+ SkMatrix transform_;
+
+ // The current clipping
+ SkRegion clip_region_;
+
+ // Previously selected brush before the current drawing.
+ HGDIOBJ previous_brush_;
+
+ // Previously selected pen before the current drawing.
+ HGDIOBJ previous_pen_;
+
+ // Copy & assign are not supported.
+ VectorPlatformDevice(const VectorPlatformDevice&);
+ const VectorPlatformDevice& operator=(const VectorPlatformDevice&);
+};
+
+} // namespace skia
+
+#endif // SKIA_EXT_VECTOR_PLATFORM_DEVICE_WIN_H_
+