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 UI_GFX_IMAGE_SKIA_OPERATIONS_H_ 6 #define UI_GFX_IMAGE_SKIA_OPERATIONS_H_ 7 8 #include "base/gtest_prod_util.h" 9 #include "skia/ext/image_operations.h" 10 #include "ui/gfx/color_utils.h" 11 #include "ui/gfx/gfx_export.h" 12 #include "ui/gfx/shadow_value.h" 13 #include "ui/gfx/skbitmap_operations.h" 14 15 namespace gfx { 16 class ImageSkia; 17 class Rect; 18 class Size; 19 20 class GFX_EXPORT ImageSkiaOperations { 21 public: 22 // Create an image that is a blend of two others. The alpha argument 23 // specifies the opacity of the second imag. The provided image must 24 // use the kARGB_8888_Config config and be of equal dimensions. 25 static ImageSkia CreateBlendedImage(const ImageSkia& first, 26 const ImageSkia& second, 27 double alpha); 28 29 // Creates an image that is the original image with opacity set to |alpha|. 30 static ImageSkia CreateTransparentImage(const ImageSkia& image, double alpha); 31 32 // Creates new image by painting first and second image respectively. 33 // The second image is centered in respect to the first image. 34 static ImageSkia CreateSuperimposedImage(const ImageSkia& first, 35 const ImageSkia& second); 36 37 // Create an image that is the original image masked out by the mask defined 38 // in the alpha image. The images must use the kARGB_8888_Config config and 39 // be of equal dimensions. 40 static ImageSkia CreateMaskedImage(const ImageSkia& first, 41 const ImageSkia& alpha); 42 43 // Create an image that is cropped from another image. This is special 44 // because it tiles the original image, so your coordinates can extend 45 // outside the bounds of the original image. 46 static ImageSkia CreateTiledImage(const ImageSkia& image, 47 int src_x, int src_y, 48 int dst_w, int dst_h); 49 50 // Shift an image's HSL values. The shift values are in the range of 0-1, 51 // with the option to specify -1 for 'no change'. The shift values are 52 // defined as: 53 // hsl_shift[0] (hue): The absolute hue value for the image - 0 and 1 map 54 // to 0 and 360 on the hue color wheel (red). 55 // hsl_shift[1] (saturation): A saturation shift for the image, with the 56 // following key values: 57 // 0 = remove all color. 58 // 0.5 = leave unchanged. 59 // 1 = fully saturate the image. 60 // hsl_shift[2] (lightness): A lightness shift for the image, with the 61 // following key values: 62 // 0 = remove all lightness (make all pixels black). 63 // 0.5 = leave unchanged. 64 // 1 = full lightness (make all pixels white). 65 static ImageSkia CreateHSLShiftedImage(const gfx::ImageSkia& image, 66 const color_utils::HSL& hsl_shift); 67 68 // Creates a button background image by compositing the color and image 69 // together, then applying the mask. This is a highly specialized composite 70 // operation that is the equivalent of drawing a background in |color|, 71 // tiling |image| over the top, and then masking the result out with |mask|. 72 // The images must use kARGB_8888_Config config. 73 static ImageSkia CreateButtonBackground(SkColor color, 74 const gfx::ImageSkia& image, 75 const gfx::ImageSkia& mask); 76 77 // Returns an image which is a subset of |image| with bounds |subset_bounds|. 78 // The |image| cannot use kA1_Config config. 79 static ImageSkia ExtractSubset(const gfx::ImageSkia& image, 80 const gfx::Rect& subset_bounds); 81 82 // Creates an image by resizing |source| to given |target_dip_size|. 83 static ImageSkia CreateResizedImage(const ImageSkia& source, 84 skia::ImageOperations::ResizeMethod methd, 85 const Size& target_dip_size); 86 87 // Creates an image with drop shadow defined in |shadows| for |source|. 88 static ImageSkia CreateImageWithDropShadow(const ImageSkia& source, 89 const ShadowValues& shadows); 90 91 // Creates an image which is a rotation of the |source|. |rotation| is the 92 // amount of clockwise rotation in degrees. 93 static ImageSkia CreateRotatedImage( 94 const ImageSkia& source, 95 SkBitmapOperations::RotationAmount rotation); 96 97 private: 98 ImageSkiaOperations(); // Class for scoping only. 99 }; 100 101 } // namespace gfx 102 103 #endif // UI_GFX_IMAGE_IMAGE_SKIA_OPERATIONS_H_ 104
