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

Issue 100097: Reverting 14712. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 11 years, 8 months ago
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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef SKIA_EXT_IMAGE_OPERATIONS_H_ 5 #ifndef SKIA_EXT_IMAGE_OPERATIONS_H_
6 #define SKIA_EXT_IMAGE_OPERATIONS_H_ 6 #define SKIA_EXT_IMAGE_OPERATIONS_H_
7 7
8 #include "base/basictypes.h" 8 #include "base/basictypes.h"
9 #include "base/gfx/rect.h" 9 #include "base/gfx/rect.h"
10 #include "SkColor.h"
11 10
12 class SkBitmap; 11 class SkBitmap;
13 12
14 namespace skia { 13 namespace skia {
15 14
16 class ImageOperations { 15 class ImageOperations {
17 public: 16 public:
18 enum ResizeMethod { 17 enum ResizeMethod {
19 // Box filter. This is a weighted average of all of the pixels touching 18 // Box filter. This is a weighted average of all of the pixels touching
20 // the destination pixel. For enlargement, this is nearest neighbor. 19 // the destination pixel. For enlargement, this is nearest neighbor.
(...skipping 19 matching lines...) Expand all
40 ResizeMethod method, 39 ResizeMethod method,
41 int dest_width, int dest_height, 40 int dest_width, int dest_height,
42 const gfx::Rect& dest_subset); 41 const gfx::Rect& dest_subset);
43 42
44 // Alternate version for resizing and returning the entire bitmap rather than 43 // Alternate version for resizing and returning the entire bitmap rather than
45 // a subset. 44 // a subset.
46 static SkBitmap Resize(const SkBitmap& source, 45 static SkBitmap Resize(const SkBitmap& source,
47 ResizeMethod method, 46 ResizeMethod method,
48 int dest_width, int dest_height); 47 int dest_width, int dest_height);
49 48
49
50 // Create a bitmap that is a blend of two others. The alpha argument 50 // Create a bitmap that is a blend of two others. The alpha argument
51 // specifies the opacity of the second bitmap. The provided bitmaps must 51 // specifies the opacity of the second bitmap. The provided bitmaps must
52 // use have the kARGB_8888_Config config and be of equal dimensions. 52 // use have the kARGB_8888_Config config and be of equal dimensions.
53 static SkBitmap CreateBlendedBitmap(const SkBitmap& first, 53 static SkBitmap CreateBlendedBitmap(const SkBitmap& first,
54 const SkBitmap& second, 54 const SkBitmap& second,
55 double alpha); 55 double alpha);
56
57 // Create a bitmap that is the original bitmap masked out by the mask defined
58 // in the alpha bitmap. The images must use the kARGB_8888_Config config and
59 // be of equal dimensions.
60 static SkBitmap CreateMaskedBitmap(const SkBitmap& first,
61 const SkBitmap& alpha);
62
63 // Blur a bitmap using an average-blur algorithm over the rectangle defined
64 // by |blur_amount|. The blur will wrap around image edges.
65 static SkBitmap CreateBlurredBitmap(const SkBitmap& bitmap, int blur_amount);
66
67 // Shift a bitmap's HSL values. The shift values are in the range of 0-1,
68 // with the option to specify -1 for 'no change'. The shift values are
69 // defined as:
70 // hsl_shift[0] (hue): The absolute hue value for the image - 0 and 1 map
71 // to 0 and 360 on the hue color wheel (red).
72 // hsl_shift[1] (saturation): A saturation shift for the image, with the
73 // following key values:
74 // 0 = remove all color.
75 // 0.5 = leave unchanged.
76 // 1 = fully saturate the image.
77 // hsl_shift[2] (lightness): A lightness shift for the image, with the
78 // following key values:
79 // 0 = remove all lightness (make all pixels black).
80 // 0.5 = leave unchanged.
81 // 1 = full lightness (make all pixels white).
82 static SkBitmap CreateHSLShiftedBitmap(const SkBitmap& bitmap,
83 float hsl_shift[3]);
84
85 // Create a bitmap that is cropped from another bitmap. This is special
86 // because it tiles the original bitmap, so your coordinates can extend
87 // outside the bounds of the original image.
88 static SkBitmap CreateTiledBitmap(const SkBitmap& bitmap,
89 int src_x, int src_y,
90 int dst_w, int dst_h);
91 private: 56 private:
92 ImageOperations(); // Class for scoping only. 57 ImageOperations(); // Class for scoping only.
93 }; 58 };
94 59
95 } // namespace skia 60 } // namespace skia
96 61
97 #endif // SKIA_EXT_IMAGE_OPERATIONS_H_ 62 #endif // SKIA_EXT_IMAGE_OPERATIONS_H_
98 63
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