1 // Copyright (c) 2011 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 PDF_DRAW_UTILS_H_ 6 #define PDF_DRAW_UTILS_H_ 7 8 #include <vector> 9 10 #include "base/basictypes.h" 11 #include "ppapi/cpp/image_data.h" 12 #include "ppapi/cpp/rect.h" 13 14 namespace chrome_pdf { 15 16 const uint8 kOpaqueAlpha = 0xFF; 17 const uint8 kTransparentAlpha = 0x00; 18 19 void AlphaBlend(const pp::ImageData& src, const pp::Rect& src_rc, 20 pp::ImageData* dest, const pp::Point& dest_origin, 21 uint8 alpha_adjustment); 22 23 // Fill rectangle with gradient horizontally or vertically. Start is a color of 24 // top-left point of the rectangle, end color is a color of 25 // top-right (horizontal==true) or bottom-left (horizontal==false) point. 26 void GradientFill(pp::ImageData* image, 27 const pp::Rect& rc, 28 uint32 start_color, 29 uint32 end_color, 30 bool horizontal); 31 32 // Fill dirty rectangle with gradient, where gradient color set for corners of 33 // gradient rectangle. Parts of the dirty rect outside of gradient rect will 34 // be unchanged. 35 void GradientFill(pp::Instance* instance, 36 pp::ImageData* image, 37 const pp::Rect& dirty_rc, 38 const pp::Rect& gradient_rc, 39 uint32 start_color, 40 uint32 end_color, 41 bool horizontal, 42 uint8 transparency); 43 44 // Copy one image into another. If stretch is true, the result occupy the entire 45 // dest_rc. If stretch is false, dest_rc.point will be used as an origin of the 46 // result image. Copy will ignore all pixels with transparent alpha from the 47 // source image. 48 void CopyImage(const pp::ImageData& src, const pp::Rect& src_rc, 49 pp::ImageData* dest, const pp::Rect& dest_rc, 50 bool stretch); 51 52 // Fill in rectangle with specified color. 53 void FillRect(pp::ImageData* image, const pp::Rect& rc, uint32 color); 54 55 // Shadow Matrix contains matrix for shadow rendering. To reduce amount of 56 // calculations user may choose to cache matrix and reuse it if nothing changed. 57 class ShadowMatrix { 58 public: 59 // Matrix parameters. 60 // depth - how big matrix should be. Shadow will go smoothly across the 61 // entire matrix from black to background color. 62 // If factor == 1, smoothing will be linear from 0 to the end (depth), 63 // if 0 < factor < 1, smoothing will drop faster near 0. 64 // if factor > 1, smoothing will drop faster near the end (depth). 65 ShadowMatrix(uint32 depth, double factor, uint32 background); 66 67 ~ShadowMatrix(); 68 GetValue(int32 x,int32 y)69 uint32 GetValue(int32 x, int32 y) const { return matrix_[y * depth_ + x]; } 70 depth()71 uint32 depth() const { return depth_; } factor()72 double factor() const { return factor_; } background()73 uint32 background() const { return background_; } 74 75 private: 76 uint32 depth_; 77 double factor_; 78 uint32 background_; 79 std::vector<uint32> matrix_; 80 }; 81 82 // Draw shadow on the image using provided ShadowMatrix. 83 // shadow_rc - rectangle occupied by shadow 84 // object_rc - rectangle that drops the shadow 85 // clip_rc - clipping region 86 void DrawShadow(pp::ImageData* image, 87 const pp::Rect& shadow_rc, 88 const pp::Rect& object_rc, 89 const pp::Rect& clip_rc, 90 const ShadowMatrix& matrix); 91 92 } // namespace chrome_pdf 93 94 #endif // PDF_DRAW_UTILS_H_ 95