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Side by Side Diff: skia/ext/bitmap_platform_device_mac.h

Issue 2616003003: Revert of Delete Mac & Cairo skia::BitmapPlatformDevice impls (Closed)
Patch Set: Created 3 years, 11 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_
6 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_
7
8 #include <stdint.h>
9
10 #include "base/compiler_specific.h"
11 #include "base/macros.h"
12 #include "skia/ext/platform_device.h"
13
14 namespace skia {
15
16 // A device is basically a wrapper around SkBitmap that provides a surface for
17 // SkCanvas to draw into. Our device provides a surface CoreGraphics can also
18 // write to. BitmapPlatformDevice creates a bitmap using
19 // CGCreateBitmapContext() in a format that Skia supports and can then use this
20 // to draw text into, etc. This pixel data is provided to the bitmap that the
21 // device contains so that it can be shared.
22 //
23 // The device owns the pixel data, when the device goes away, the pixel data
24 // also becomes invalid. THIS IS DIFFERENT THAN NORMAL SKIA which uses
25 // reference counting for the pixel data. In normal Skia, you could assign
26 // another bitmap to this device's bitmap and everything will work properly.
27 // For us, that other bitmap will become invalid as soon as the device becomes
28 // invalid, which may lead to subtle bugs. Therefore, DO NOT ASSIGN THE
29 // DEVICE'S PIXEL DATA TO ANOTHER BITMAP, make sure you copy instead.
30 class SK_API BitmapPlatformDevice : public SkBitmapDevice, public PlatformDevice {
31 public:
32 // Creates a BitmapPlatformDevice instance. |is_opaque| should be set if the
33 // caller knows the bitmap will be completely opaque and allows some
34 // optimizations.
35 // |context| may be NULL. If |context| is NULL, then the bitmap backing store
36 // is not initialized.
37 static BitmapPlatformDevice* Create(CGContextRef context,
38 int width, int height,
39 bool is_opaque, bool do_clear = false);
40
41 // Creates a context for |data| and calls Create.
42 // If |data| is NULL, then the bitmap backing store is not initialized.
43 static BitmapPlatformDevice* CreateWithData(uint8_t* data,
44 int width, int height,
45 bool is_opaque);
46
47 ~BitmapPlatformDevice() override;
48
49 protected:
50 BitmapPlatformDevice(CGContextRef context,
51 const SkBitmap& bitmap);
52
53 SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) override;
54
55 private:
56 NativeDrawingContext BeginPlatformPaint(const SkMatrix& transform,
57 const SkIRect& clip_bounds) override;
58
59 void ReleaseBitmapContext();
60
61 // Loads the current transform and clip into the context. Can be called even
62 // when |bitmap_context_| is NULL (will be a NOP).
63 void LoadConfig(const SkMatrix& transform, const SkIRect& clip_bounds);
64
65 // Lazily-created graphics context used to draw into the bitmap.
66 CGContextRef bitmap_context_;
67
68 DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDevice);
69 };
70
71 } // namespace skia
72
73 #endif // SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_
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